A method for treating laterite nickel ore in a full chain integration

Abstract

The application discloses a method for integrally processing laterite nickel ore in a whole chain, and belongs to the technical field of nonferrous metallurgy, and comprises the following steps: smelting laterite nickel ore pellets, a flux, a reducing agent and a sulfidizing agent to obtain molten reduced sulfidized slag and molten low-nickel matte; performing lean settlement separation on the molten reduced sulfidized slag to obtain lean-cobalt low-nickel matte and electric furnace slag; and adding the molten low-nickel matte into a side-blown converter to perform blowing and refining to obtain high-ice nickel and molten blown slag; and the method can fully extract the components of the laterite nickel ore, wherein nickel and cobalt are fully recovered, and the economic value is extremely high.

Description

Technical Field

[0001] This application relates to the field of non-ferrous metallurgical technology, specifically to a method for integrated processing of laterite nickel ore across the entire chain. Background Technology

[0002] Of the world’s onshore nickel resources, about 60% exist in the form of laterite nickel ore. With the continuous growth in demand for nickel for stainless steel and new energy, laterite nickel ore has gradually become the main form of nickel resource supply due to its relatively abundant reserves and easy mining. At present, the smelting process of laterite nickel ore includes two main directions: pyrometallurgical and hydrometallurgical. Generally, pyrometallurgical is suitable for siliceous magnesium nickel ore with relatively high nickel content, while hydrometallurgical is suitable for limonite nickel ore with relatively low nickel content.

[0003] The main hydrometallurgical processes for lateritic nickel ore include reduction roasting-ammonia leaching (Caron process), high-pressure acid leaching (HPAL), and atmospheric-pressure acid leaching (AL). Each of these three processes is suitable for lateritic nickel ores with varying MgO contents. Because MgO causes unnecessary acid consumption during the reaction, thus increasing costs, hydrometallurgical processes are generally suitable for processing limonite ores with Mg content less than 5%. The large amount of leaching residue and high acid consumption produced by hydrometallurgical processes for lateritic nickel ore affect subsequent processing, limiting the large-scale industrial application of this technology.

[0004] The pyrometallurgical processes for laterite nickel ore mainly include rotary kiln-electric furnace (RKEF) process, blast furnace smelting process, rotary kiln direct reduction nickel-iron process, rotary hearth furnace process, DC electric furnace process, vertical shaft furnace process, and tunnel kiln process. The characteristics of pyrometallurgical processes are low investment, simple equipment and processes, low production costs, high raw material selectivity, large capacity, relatively mature technology, high nickel recovery rate, and high degree of automation. The disadvantages are rotary kiln ring formation, low preheating utilization rate, high power consumption, low waste heat utilization rate, high dust rate, high nickel content in the dust, inability to recover cobalt from laterite nickel ore, and unsuitability for processing laterite nickel ores with low nickel content and high cobalt content.

[0005] Against the backdrop of the global trend towards electric vehicles, Indonesia's excellent laterite nickel ore resources have been fully utilized. Based on years of technological development and the urgent demand for nickel sulfate and cobalt sulfate for new energy power battery materials, high-grade nickel matte will also become an important source of raw materials for nickel sulfate and cobalt sulfate, quickly and effectively filling the nickel gap for new energy applications. With the gradual commissioning of Indonesian nickel pig iron production capacity, a certain degree of overcapacity in the nickel pig iron sector cannot be ruled out in the future. Switching to high-grade nickel matte production will become the choice for many low-cost nickel pig iron manufacturers. High-grade nickel matte is used to produce electrolytic nickel and various nickel salts, and is a downstream product of laterite nickel ore and nickel sulfide ore. Currently, building "integrated industrial parks" has become the primary choice for many laterite nickel ore smelters to reduce costs, increase efficiency, and improve market competitiveness. This involves processing laterite nickel ore to obtain high-grade nickel matte, and then further extracting the high-grade nickel matte to obtain nickel salts for battery materials, thus forming an integrated industrial chain. Therefore, there is an urgent need to develop an integrated high-grade nickel matte production process that is low in energy consumption, low in cost, high in output, has a high recovery rate of valuable metals, strong material adaptability, and is environmentally friendly. Therefore, it is of great significance to develop a production process for producing high-grade nickel matte from laterite nickel ore through oxygen-enriched double-sided blowing pool smelting reduction sulfidation process.

[0006] Related technologies disclose a system and method for processing lateritic nickel ore, comprising: a pretreatment unit with a lateritic nickel ore inlet and a lateritic nickel ore particle outlet; a mixing and pelletizing device with a lateritic nickel ore particle inlet, a reducing agent inlet, a sulfiding agent inlet, and a mixed pellet outlet; a pre-reduction sulfidation device with a mixed pellet inlet and a roasted sand outlet; a smelting device with a roasted sand inlet, a smelting solvent inlet, a combustible fuel inlet, an oxygen-enriched air inlet, a first low-nickel matte outlet, and a smelting slag outlet; and a blowing device with a first low-nickel matte inlet, a blowing solvent inlet, a high-nickel matte outlet, and a blowing slag outlet. This process uses a traditional rotary kiln + smelting furnace process to smelt lateritic nickel ore, which has a long process flow, large rotary kiln flue gas volume, poor environmental protection, and high overall energy consumption. This invention eliminates the rotary kiln roasting system step and directly processes lateritic nickel ore using an oxygen-enriched side-blown furnace, resulting in a shorter process flow, safety and environmental protection, low overall energy consumption, large processing capacity, and lower cost.

[0007] The related technology discloses a method for extracting nickel and cobalt from laterite nickel ore through cyclic sulfidation. The main process route involves crushing and roasting the laterite nickel ore, sulfidation, smelting in a molten pool to obtain low-grade nickel matte, final wet processing to extract nickel and cobalt, converter blowing to obtain cobalt-rich high-grade nickel matte, reducing and sulfiding the blowing slag, and collecting smelting flue gas to roast the laterite nickel ore. This process also employs rotary kiln pre-reduction roasting and sulfidation, increasing the smelting steps and overall energy consumption. The gypsum slag produced in the process needs to be dried before being fed into the smelting furnace, increasing drying costs. Furthermore, the flue gas circulation process in this technology is complex and presents risks of air leakage.

[0008] The related technology discloses an oxygen-enriched pulverized coal smelting reduction process and a smelting reduction furnace for lateritic nickel ore. The process includes: dehydrating the lateritic nickel ore to reduce its moisture content to below 22%; adding the dehydrated lateritic nickel ore into the smelting reduction furnace along with flux; and injecting oxygen-enriched gas, reducing agent, and fuel into the molten pool mixing zone of the smelting reduction furnace at a flow rate of 180 m / s to 280 m / s through a multi-channel spray gun, raising the temperature in the molten pool to 1450℃ to 1550℃ to induce a molten pool smelting reaction in the materials within the furnace, generating ferronickel alloy and smelting slag; wherein the molten pool mixing zone contains both ferronickel alloy and smelting slag; and discharging the smelting slag from the slag outlet and the ferronickel alloy from the metal outlet. This process belongs to the process of producing nickel-iron by melting and reducing laterite nickel ore. However, this process first reduces and sulfides laterite nickel ore in an oxygen-enriched side-blown smelting furnace to produce low-grade nickel matte, and then uses an oxygen-enriched side-blown smelting furnace to produce high-grade nickel matte. There are obvious differences in the process. Summary of the Invention

[0009] The purpose of this application is to overcome the shortcomings of the existing technology and provide a method for the integrated processing of laterite nickel ore through the entire chain. This method can fully extract the components of laterite nickel ore, and the extracted high-grade nickel matte can be used as a raw material for the preparation of battery-grade nickel sulfate and cobalt sulfate. Nickel and cobalt are fully recovered, with nickel recovery rate reaching 87-99% and cobalt recovery rate reaching 76-98%, which has extremely high economic value.

[0010] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0011] A method for processing laterite nickel ore includes the following steps:

[0012] (1) The laterite nickel ore is screened, crushed and dried to obtain the crushed material;

[0013] (2) Mix the crushed material, the first flux, the first reducing agent and the first sulfiding agent and granulate them to obtain laterite nickel ore pellets;

[0014] (3) The laterite nickel ore pellets, the second flux, the second reducing agent and the second sulfiding agent are smelted to obtain molten reduced sulfidation slag and molten low-nickel matte;

[0015] (4) The molten reduction sulfide slag is depleted and separated by sedimentation to obtain cobalt-depleted low-nickel matte and electric furnace slag;

[0016] (5) Add electric furnace slag, third flux, third reducing agent and third sulfiding agent to the reduction sulfidation device to carry out reduction sulfidation reaction to obtain cobalt-poor low-cobalt nickel matte and reduction slag;

[0017] (6) Grind the reducing slag to obtain the slag ore. Mix the slag ore, frother, activator and collector and then float to obtain nickel-cobalt concentrate and the first tailings slag. Magnetic separation of the first tailings slag to obtain nickel-cobalt alloy and the second tailings slag.

[0018] (7) Molten low-nickel matte, low-cobalt low-nickel matte, low-cobalt low-matte, nickel-cobalt concentrate, nickel-cobalt alloy, fourth reducing agent and fourth flux are added to a side-blown furnace for smelting to obtain high-grade matte and molten smelting slag.

[0019] As a preferred embodiment of this application, the following steps are also included:

[0020] (8) Add the molten blowing slag, the fifth flux, the fifth reducing agent and the fourth sulfiding agent to the reduction sulfidation device to carry out the reduction sulfidation reaction to obtain cobalt-rich low-nickel matte and molten slag;

[0021] (9) Add the molten slag and the sixth flux to the oxidizing furnace for oxidizing and smelting to obtain nickel-cobalt magnetite. After the first magnetic separation, the nickel-cobalt magnetite is separated to obtain nickel-cobalt magnetite concentrate and tailings. After the nickel-cobalt magnetite concentrate is separated by a second magnetic separation, iron concentrate and cobalt-nickel matte are obtained.

[0022] (10) Cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, sixth reducing agent and seventh flux are added to a side-blown furnace for smelting to obtain high-grade nickel matte and molten smelting slag.

[0023] As a preferred embodiment of this application, the first flux, the second flux, the third flux, the fourth flux, the fifth flux, the sixth flux, and the seventh flux are each independently selected from at least one of quartz stone and limestone.

[0024] As a preferred embodiment of this application, the first reducing agent, the second reducing agent, the third reducing agent, the fourth reducing agent, the fifth reducing agent, and the sixth reducing agent are each independently selected from at least one of semi-coke, coke, anthracite, and graphite powder.

[0025] As a preferred embodiment of this application, the first sulfiding agent, the second sulfiding agent, the third sulfiding agent, and the fourth sulfiding agent are each independently selected from at least one of sulfur, pyrite, gypsum, and sulfur-containing minerals.

[0026] In a preferred embodiment of this application, the mass ratio of the crushed material, the first flux, the first reducing agent, and the first vulcanizing agent is 1:(0.02-0.13):(0.02-0.17):(0.03-0.22).

[0027] As a preferred embodiment of this application, the mass ratio of the laterite nickel ore pellets, the second flux, the second reducing agent, and the second sulfiding agent is 1:(0.02~0.12):(0.02~0.1):(0.02~0.13).

[0028] As a preferred embodiment of this application, the mass ratio of the electric furnace slag, the third flux, the third reducing agent, and the third sulfiding agent is 1:(0.01~0.1):(0.01~0.13):(0.03~0.15).

[0029] As a preferred embodiment of this application, the mass ratio of the molten low-nickel matte, low-cobalt low-nickel matte, low-cobalt low-matte, nickel-cobalt concentrate, nickel-cobalt alloy, fourth reducing agent, and fourth flux is 1:(0.2-0.5):(0.1-0.6):(0.05-0.5):(0.01-0.07):(0.05-0.25).

[0030] In a preferred embodiment of this application, the mass ratio of the molten blowing slag, the fifth flux, the fifth reducing agent, and the fourth sulfiding agent is 1:(0.01~0.11):(0.01~0.12):(0.02~0.18).

[0031] In a preferred embodiment of this application, the mass ratio of the molten slag to the sixth flux is 1:(0.01 to 0.15).

[0032] As a preferred embodiment of this application, the mass ratio of the cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, the sixth reducing agent, and the seventh flux is 1:(0.1~0.7):(0.01~0.08):(0.05~0.25).

[0033] As a preferred embodiment of this application, the foaming agent includes at least one of No. 2 oil, polyethylene glycol ether, methyl isobutyl methanol, and triethoxybutane.

[0034] In a preferred embodiment of this application, the activator is Na2S.

[0035] As a preferred embodiment of this application, the collector includes at least one of ethyl xanthate, butyl xanthate, isopropyl xanthate, isobutyl xanthate, pentyl xanthate, hexyl xanthate, phenolic black, alcoholic black, oxoalkanol black, fatty acid, alkyl sulfonate, and kerosene.

[0036] As a preferred embodiment of this application, the mass ratio of the slag ore, frother, activator and collector is 1t:(18-55)g:(45-320)g:(48-230)g.

[0037] In a preferred embodiment of this application, the smelting in step (3) is carried out in a furnace. During smelting, the oxygen purity in the furnace is 90%–98%, the oxygen-enriched air volume concentration is 50%–85%, the fuel excess coefficient is 70%–95%, the total furnace smelting coefficient is 70%–100%, and the smelting temperature is 1250℃–1620℃. In a preferred embodiment of this application, the temperature for the lean sedimentation separation is 1200℃–1480℃, and the lean separation time is 30 min–120 min.

[0038] As a preferred embodiment of this application, the blowing temperature in both step (7) and step S2 is 1210℃~1350℃.

[0039] As a preferred embodiment of this application, the mass concentration of the sulfuric acid solution in step (8) and step S3 is 10% to 26%.

[0040] As a preferred embodiment of this application, the magnetic field strength of the first magnetic separation is 4100GS to 8200GS, and the magnetic field strength of the second magnetic separation is 2100GS to 3500GS.

[0041] The beneficial effects of this application are as follows: (1) This application removes most of the physical water by screening, crushing and drying laterite nickel ore, and then mixes and granulates it with the first flux, the first reducing agent and the first sulfiding agent to obtain laterite nickel ore pellets. Then, the laterite nickel ore pellets are reduced and sulfided to obtain molten reduced sulfidation slag and molten low-grade nickel matte. The molten reduced sulfidation slag is depleted and separated by sedimentation to achieve effective separation of matte, metallic elements and slag, to obtain low-cobalt low-nickel matte and electric furnace slag. The electric furnace slag is then reduced and sulfided to allow the valuable elements of nickel and cobalt to undergo a reduction and sulfidation reaction, to obtain low-cobalt low-grade nickel matte and reduced sulfidation slag. The original slag is then crushed to obtain slag ore. The slag ore, frother, activator and collector are mixed and floated to obtain nickel-cobalt concentrate and first tailings slag. The first tailings slag is magnetically separated to obtain nickel-cobalt alloy and second tailings slag. The second tailings slag can be sold directly. Then, the molten low-nickel matte, low-cobalt low-nickel matte, low-cobalt low-matte, nickel-cobalt concentrate and nickel-cobalt alloy generated in the process are side-blown in the presence of the fourth reducing agent and the fourth flux to obtain molten high-grade matte and molten smelting slag. The molten high-grade matte has high nickel and cobalt content and is a raw material for preparing battery-grade nickel sulfate and battery-grade cobalt sulfate. (2) The recovery rate of the entire system in this application is high. The nickel and cobalt generated in each process are collected and then smelted, thereby effectively improving the recovery rate. The recovery rate of nickel reaches 87-99% and the recovery rate of cobalt reaches 76-98%, which has extremely high economic value. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] In this application, the technical features described in an open-ended manner include both closed technical solutions consisting of the listed features and open technical solutions that include the listed features.

[0044] In this application, numerical ranges are referred to as continuous unless otherwise specified, and include the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0045] In this application, there are no particular restrictions on the specific dispersion and mixing methods.

[0046] In this application, unless otherwise stated, all parts are parts by weight.

[0047] Unless otherwise specified, all reagents or instruments used in this application are commercially available products.

[0048] This application provides a method for processing laterite nickel ore, including the following steps:

[0049] (1) The laterite nickel ore is screened and crushed in multiple stages to make the particle size 0.3mm to 10mm. The free water of the laterite nickel ore is removed by drying kiln so that the moisture content of the deeply dried and dehydrated laterite nickel ore is 10% to 24%, and the crushed material is obtained.

[0050] Laterite nickel ore comprises the following main mass components: 0.85%–3.34% Ni, 0.01%–0.27% Co, 7.98%–39.43% SiO2, 2.99%–17.49% MgO, and 10%–42.86% Fe;

[0051] (2) The crushed material, the first flux, the first reducing agent and the first sulfiding agent are added to the disc granulator for mixing and granulation. The pelletizing rate is 90-96% and the mixed pellet diameter is 5mm-30mm to obtain laterite nickel ore pellets.

[0052] (3) Laterite nickel ore pellets, the second flux, the second reducing agent, and the second sulfiding agent are smelted through the charging port. Fuel, preheated compressed air, and oxygen are added to the furnace through a spray gun. The oxygen-enriched air blown in strongly stirs the high-temperature mixed melt, causing turbulent movement throughout the melt in this area. This promotes the rapid and uniform distribution of the added materials in the melt. Mass and heat transfer processes are achieved between the high-temperature mixed melt and the furnace charge, and between the melt and the blown gas. The melt in the upper part of the furnace is called the slag-nickel matte emulsion phase, which contains 80% to 96% (by volume) of the furnace charge. The slag contains 3%–12% (by volume) of sulfides and metal particles. Due to the intense stirring in this area, the metals or sulfides generated by reduction sulfidation collide and merge with each other. Once the kinetic stability conditions are reached, i.e. the particles aggregate and grow to 0.3–6 mm, they can quickly fall from the upper bubbling zone into the lower bottom phase. Under the action of gravity, the melt in the lower part of the furnace is divided into molten reduced sulfide slag and molten low-grade nickel matte. The molten reduced sulfide slag and molten low-grade nickel matte enter the slag chamber through the duct. The molten reduced sulfide slag overflows and is discharged, while the molten low-grade nickel matte is discharged through the siphon under pressure.

[0053] The molten reduction sulfide slag contains the following main mass components: 11%–32% Ni, 0.1%–1.4% Co, 25%–65% Fe, and 5%–30% S.

[0054] The molten reduction sulfide slag contains the following main mass components: 0.10%–0.5% Ni, 0.004%–0.011% Co, and 23%–46% Fe.

[0055] (4) The molten reduction sulfide slag is depleted and settled for separation. The molten reduction sulfide slag contains some low-grade nickel matte and nickel-cobalt metal elements. In order to heat preservation and settle for separation to achieve effective separation of matte, metal elements and slag, resistance heat and arc heat generated by electrodes inserted into the melt can be used. During this period, the low-grade cobalt and low-nickel matte droplets are continuously separated from the slag and settled to the bottom of the furnace for enrichment, and are discharged through the metal discharge port to obtain low-grade cobalt and low-nickel matte. The slag after separating the low-grade cobalt and low-nickel matte becomes electric furnace slag.

[0056] (5) Add electric furnace slag, third flux, third reducing agent and third sulfiding agent to the reduction sulfidation device to carry out reduction sulfidation reaction. Blow fuel and oxygen-enriched air into the molten pool to rapidly raise the temperature, so that the valuable elements of nickel and cobalt in the slag can undergo reduction sulfidation reaction to obtain cobalt-poor low-grade nickel matte and reduced slag. According to the height of the molten pool of the reduction fusion furnace, the reduced slag is discharged into the slag bag at regular intervals. The slag bag full of reduced slag is transported to the slag bag yard by slag bag car. The reduced slag is naturally cooled for 20h to 48h, and then water is sprayed onto the reduced slag to cool it for 10h to 38h until the reduced slag is completely cooled. The reduced slag is then crushed and ground to -200 mesh to -300 mesh to make slag ore.

[0057] (6) The cooled reducing slag is crushed and ground to -200 mesh to -300 mesh to make slag ore. The slag ore, frother, activator and collector are mixed and floated to obtain nickel-cobalt concentrate and first tailings slag. The first tailings slag is magnetically separated to obtain nickel-cobalt alloy and second tailings slag. The second tailings slag can be sold directly.

[0058] (7) Molten low-nickel matte, low-cobalt low-nickel matte, low-cobalt low-matte, nickel-cobalt concentrate, nickel-cobalt alloy, fourth reducing agent and fourth flux are added to the side-blown furnace for smelting. The molten high-matte produced is continuously discharged through the metal discharge siphon, and the molten smelting slag is continuously discharged from the slag discharge overflow port.

[0059] The molten low-nickel matte can also be water-quenched and then smelted.

[0060] The main chemical reaction equations for the blowing process are as follows:

[0061] 3FeS + 5O2 = Fe3O4 + 3SO2 (1)

[0062] Fe + 1 / 2O₂ = FeO (2)

[0063] 2FeS + 3O2 = 2FeO + 2SO2 (3)

[0064] 2FeO + SiO2 = 2FeO·SiO2 (4)

[0065] Ni3S2+7 / 2O2=3NiO+2SO2 (5)

[0066] Ni3S2+2O2=3Ni+2SO2 (6)

[0067] CoS + O2 = Co + SO2 (7)

[0068] 2CoS + 3O2 = 2CoO + 2SO2 (8)

[0069] Fe3O4 + 1 / 2C = 3FeO + 1 / 2CO2 (9)

[0070] 2NiO + C = 2Ni + CO2 (10)

[0071] 2CoO + C = 2Co + CO2 (11)

[0072] This application involves screening, crushing, and drying laterite nickel ore to remove most of the physical water. The ore is then mixed with a first flux, a first reducing agent, and a first sulfiding agent to form granules, resulting in laterite nickel ore pellets. These pellets are then subjected to reduction sulfidation to obtain molten reduction sulfidation slag and molten low-grade nickel matte. The molten reduction sulfidation slag is then subjected to depletion sedimentation separation to effectively separate matte, elemental metals, and slag, yielding depleted cobalt low-nickel matte and electric furnace slag. The electric furnace slag is then subjected to further reduction sulfidation to reduce the valuable nickel and cobalt elements, resulting in depleted cobalt low-grade nickel matte and reduction slag. Finally, the reduction slag is further... The slag is crushed to obtain raw slag ore. The raw slag ore, frother, activator and collector are mixed and then floated to obtain nickel-cobalt concentrate and first tailings slag. The first tailings slag is magnetically separated to obtain nickel-cobalt alloy and second tailings slag. The second tailings slag can be sold directly. Then, the molten low-nickel matte, low-cobalt low-nickel matte, low-cobalt low-matte, nickel-cobalt concentrate and nickel-cobalt alloy generated in the process are side-blown in the presence of a fourth reducing agent and a fourth flux to obtain molten high-grade matte and molten blowing slag. The molten high-grade matte has a high nickel and cobalt content and is a raw material for the preparation of battery-grade nickel sulfate and battery-grade cobalt sulfate.

[0073] This application presents a system with a high overall recovery rate. It collects nickel and cobalt generated in each process and then smelts them, thereby effectively improving the recovery rate. The recovery rate of nickel reaches 87-99%, and the recovery rate of cobalt reaches 76-98%, which has extremely high economic value.

[0074] In subsequent processing, high-grade nickel matte can be cast, crushed, ground, and leached with sulfuric acid solution to obtain a mixed solution containing nickel sulfate and cobalt sulfate and leaching residue. After extraction and crystallization, battery-grade nickel sulfate and battery-grade cobalt sulfate are obtained respectively.

[0075] The high-grade nickel matte prepared contains the following main chemical components by mass: Ni 55%–85%, Co 1.0%–4.5%, S 4%–16%, and Fe 3%–8%.

[0076] The molten blowing slag contains the following main chemical components by mass: Ni 0.1%–2.1%, Co 0.01%–0.31%, and Fe 23%–52%.

[0077] In some implementations, the following steps are also included:

[0078] S1. Molten blowing slag, fifth flux, fifth reducing agent, and fourth sulfiding agent are added to the reduction sulfidation device to carry out the reduction sulfidation reaction. Fuel is injected and oxygen-enriched air is blown in to provide heat to the molten pool. Taking advantage of the fact that the affinity of metallic nickel for sulfur is close to that of iron, while its affinity for oxygen is much less than that of iron, in the matte smelting process with different degrees of oxidation, nickel, cobalt, and iron oxides react under the action of the sulfiding agent to generate Ni3S2, CoS, and FeS, while iron sulfides are continuously oxidized into oxides in stages. Subsequently, they are removed by slag formation with gangue. The reduction sulfidation generates cobalt-rich low-nickel matte and molten slag.

[0079] S2. Molten slag and the sixth flux are added to the oxidizing furnace for oxidation and smelting. This causes a large amount of iron in the molten slag to be oxidized to generate iron(II,III) oxide, which transforms the iron olive tree phase into the magnetite phase. While the magnetite grows, it can accumulate valuable metals such as nickel and cobalt to form new nickel-cobalt-rich magnetite. After the first magnetic separation, the nickel-cobalt-rich magnetite concentrate and tailings are obtained. After the second magnetic separation, the nickel-cobalt-rich magnetite concentrate is separated to obtain iron concentrate and cobalt-nickel matte ore.

[0080] S3. Cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, the sixth reducing agent, and the seventh flux are added to a side-blown furnace for smelting to obtain high-grade nickel matte and molten smelting slag.

[0081] By reducing and sulfiding the molten slag produced in the above process, and taking advantage of the fact that the affinity of metallic nickel for sulfur is close to that of iron, while its affinity for oxygen is much less than that of iron, nickel, cobalt and iron oxides react under the action of sulfiding agent to generate Ni3S2, CoS and FeS during the matte smelting process with different oxidation degrees. Iron sulfides are continuously oxidized into oxides in stages, and then removed by slag formation with gangue. The reduction and sulfidation generates cobalt-rich low-nickel matte and molten slag. After oxidation and secondary magnetic separation, iron concentrate and cobalt-rich nickel matte are obtained. The steps (7) and (8) above are repeated for the cobalt-rich low-nickel matte and cobalt-rich nickel matte to extract nickel and cobalt, and finally high-grade nickel matte is obtained.

[0082] This application enables the full extraction of components from laterite nickel ore, with nickel and cobalt being fully recovered. The tailings, second tailings slag, and iron concentrate generated during the process can be sold directly, resulting in significant economic benefits.

[0083] In some embodiments, the first flux, second flux, third flux, fourth flux, fifth flux, sixth flux, and seventh flux are each independently selected from at least one of quartz and limestone.

[0084] In some embodiments, the first reducing agent, the second reducing agent, the third reducing agent, the fourth reducing agent, the fifth reducing agent, and the sixth reducing agent are each independently selected from at least one of semi-coke, coke, anthracite, and graphite powder.

[0085] In some embodiments, the first sulfiding agent, the second sulfiding agent, the third sulfiding agent, and the fourth sulfiding agent are each independently selected from at least one of sulfur, pyrite, gypsum, and sulfur-containing minerals.

[0086] In some embodiments, the mass ratio of the crushed material, the first flux, the first reducing agent, and the first vulcanizing agent is 1:(0.02-0.13):(0.02-0.17):(0.03-0.22).

[0087] In some embodiments, the mass ratio of the laterite nickel ore pellets, the second flux, the second reducing agent, and the second sulfiding agent is 1:(0.02-0.12):(0.02-0.1):(0.02-0.13).

[0088] In some embodiments, the mass ratio of the electric furnace slag, the third flux, the third reducing agent, and the third sulfiding agent is 1:(0.01-0.1):(0.01-0.13):(0.03-0.15).

[0089] In some embodiments, the mass ratio of the molten low-nickel matte, low-cobalt low-nickel matte, low-cobalt low-matte, nickel-cobalt concentrate, nickel-cobalt alloy, fourth reducing agent, and fourth flux is 1:(0.2-0.5):(0.1-0.6):(0.05-0.5):(0.01-0.07):(0.05-0.25).

[0090] In some embodiments, the mass ratio of the molten blowing slag, the fifth flux, the fifth reducing agent, and the fourth sulfiding agent is 1:(0.01-0.11):(0.01-0.12):(0.02-0.18).

[0091] In some embodiments, the mass ratio of the molten slag to the sixth flux is 1:(0.01 to 0.15).

[0092] In some embodiments, the mass ratio of the cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, the sixth reducing agent, and the seventh flux is 1:(0.1-0.7):(0.01-0.08):(0.05-0.25).

[0093] In some embodiments, the foaming agent includes at least one of No. 2 oil, polyethylene glycol ether, methyl isobutyl methanol, and triethoxybutane.

[0094] In some embodiments, the activator is Na2S.

[0095] In some embodiments, the collector includes at least one of ethyl xanthate, butyl xanthate, isopropyl xanthate, isobutyl xanthate, pentyl xanthate, hexyl xanthate, phenolic black, alcoholic black, oxoalkanol black, fatty acid, alkyl sulfonate, and kerosene.

[0096] In some embodiments, the mass ratio of the slag ore, foaming agent, activator, and collector is 1t:(18-55)g:(45-320)g:(48-230)g.

[0097] In some embodiments, the smelting in step (3) is carried out in a smelting furnace, where the oxygen purity is 90% to 98%, the oxygen-enriched air volume concentration is 50% to 85%, the fuel excess coefficient is 70% to 95%, the total furnace smelting coefficient is 70% to 100%, and the smelting temperature is 1250°C to 1620°C.

[0098] In some embodiments, the temperature for the depletion sedimentation separation is 1200℃~1480℃, and the time for the depletion separation is 30min~120min.

[0099] In some embodiments, the blowing temperature in steps (7) and S2 is 1210°C to 1350°C.

[0100] In some embodiments, the mass concentration of the sulfuric acid solution in step (8) and step S3 is 10% to 26%.

[0101] In some embodiments, the magnetic field strength of the first magnetic separation is 4100GS to 8200GS, and the magnetic field strength of the second magnetic separation is 2100GS to 3500GS.

[0102] Example 1

[0103] A method for processing laterite nickel ore includes the following steps:

[0104] (1) The laterite nickel ore is screened and crushed in multiple stages to make the ore particle size 0.3mm. The free water of the laterite nickel ore is removed by drying kiln to make the moisture content of the deeply dried and dehydrated laterite nickel ore 10%, and the crushed material is obtained.

[0105] Laterite nickel ore comprises the following main mass components: 0.85% Ni, 0.27% Co, 7.98% SiO2, 2.99% MgO, and 42.86% Fe;

[0106] (2) Add crushed material, quartz, anthracite and gypsum into a disc pellet mill for mixing and pelletizing. The pelletizing rate is 96% and the mixed pellet diameter is 5mm to obtain laterite nickel ore pellets.

[0107] The mass ratio of the crushed material, quartz, anthracite, and gypsum is 1:0.02:0.02:0.22.

[0108] (3) Laterite nickel ore pellets, quartz, anthracite, and gypsum are added to the smelting furnace through the charging port for smelting. Fuel, preheated compressed air, and oxygen are added to the furnace through a spray gun. The oxygen-enriched air blown in strongly stirs the high-temperature mixed melt, causing turbulent movement throughout the melt in this area. This promotes the rapid and uniform distribution of the added materials in the melt. Mass and heat transfer processes are achieved between the high-temperature mixed melt and the furnace charge, and between the melt and the blown gas. The melt in the upper part of the furnace is called the slag-nickel matte emulsion phase, which contains 80% (by volume) of the slag-nickel matte emulsion phase. The slag and 12% (by volume) of sulfides and metal particles are subjected to intense agitation in this area, causing the metals or sulfides generated by reduction sulfidation to collide and merge with each other. Once the kinetic stability condition is reached, i.e. the particles aggregate and grow to 0.3 mm, they can quickly fall from the upper bubbling zone into the lower bottom phase. Under the action of gravity, the melt in the lower part of the furnace is divided into molten reduced sulfide slag and molten low-grade nickel matte. The molten reduced sulfide slag and molten low-grade nickel matte enter the slag chamber through the duct. The molten reduced sulfide slag overflows and is discharged, while the molten low-grade nickel matte is discharged through the siphon under pressure.

[0109] The mass ratio of laterite nickel ore pellets, quartz, anthracite, and gypsum is 1:0.02:0.02:0.13.

[0110] The fuel is natural gas, and the fuel ratio is 25% of the mass of laterite nickel ore pellets. The preheated compressed air injection rate is 12000 Nm³. 3 / h; the oxygen purity is 90%, the oxygen-enriched air volume concentration in the furnace is 50%, the fuel excess coefficient is 70%, the total furnace smelting coefficient is 100%, and the smelting temperature is controlled at 1250℃; the composition of the molten low-nickel matte is: Ni 11%, Co 1.4%, Fe 64%, S 23%. The main chemical composition of the molten reduction sulfide slag is: Ni 0.10%, Co 0.004%, Fe 23%.

[0111] (4) The molten reduction sulfide slag is added to the depletion electric furnace for depletion sedimentation and separation. The temperature of the electric furnace is controlled at 1200℃. During this period, the depleted cobalt low-nickel matte droplets are continuously separated from the slag, settled to the bottom of the furnace and enriched, and discharged through the metal discharge port to obtain depleted cobalt low-nickel matte. The slag after separating the depleted cobalt low-nickel matte becomes electric furnace slag.

[0112] (5) Add electric furnace slag, quartz, anthracite and pyrite to the reduction sulfidation device to carry out reduction sulfidation reaction. Blow fuel and oxygen-enriched air into the molten pool to quickly raise the temperature so that the valuable elements of nickel and cobalt in the slag can undergo reduction sulfidation reaction to obtain cobalt-poor low-grade nickel matte and reduction slag. According to the height of the molten pool of the reduction fusion furnace, the reduction slag is discharged into the slag bag at regular intervals. The slag bag filled with reduction slag is transported to the slag bag yard by slag bag car and the reduction slag is naturally cooled for 20 hours, and then water is sprayed onto the reduction slag for 10 hours to cool it.

[0113] The mass ratio of electric furnace slag, quartz, anthracite, and pyrite is 1:0.01:0.13:0.03.

[0114] (6) The cooled reducing slag is crushed and ground to -200 mesh to make slag ore. The slag ore, No. 2 oil, Na2S, ethyl xanthate and butyl xanthate are mixed and floated to obtain nickel-cobalt concentrate and first tailings slag. The first tailings slag is magnetically separated to obtain nickel-cobalt alloy and second tailings slag. The second tailings slag can be sold directly.

[0115] The mass ratio of raw slag ore, No. 2 oil, Na2S, ethyl xanthate and butyl xanthate is 1 ton (t): 18g: 320g: 24g: 24g.

[0116] (7) Molten low-nickel matte, low-cobalt low-nickel matte, low-cobalt low-matte, nickel-cobalt concentrate, nickel-cobalt alloy, coke, and quartz are added to a side-blown furnace for refining, and preheated compressed air is blown in (the blowing rate is 10000 Nm). 3 At a temperature of 1210℃, the de-ironization, desulfurization, slag-forming and blowing operations are carried out continuously to produce high-grade nickel matte and molten blowing slag. The molten high-grade nickel matte is continuously discharged through the metal discharge siphon, and the molten blowing slag is continuously discharged from the slag discharge overflow outlet.

[0117] The mass ratio of molten low-nickel matte, low-cobalt low-nickel matte, low-cobalt low-matte, nickel-cobalt concentrate, nickel-cobalt alloy, coke, and quartz is 1:0.2:0.6:0.05:0.07:0.25.

[0118] The main components of high-grade nickel matte are: Ni 55%, Co 1.0%, S 16%, and Fe 8%; the main chemical components of molten blowing slag are: Ni 2.1%, Co 0.31%, and Fe 23%.

[0119] (8) Molten blowing slag, quartz, anthracite, and sulfur are added to the reduction sulfidation device to carry out the reduction sulfidation reaction. Fuel is injected and oxygen-enriched air is blown in to provide heat to the molten pool. Taking advantage of the fact that the affinity of metallic nickel for sulfur is close to that of iron, while its affinity for oxygen is much less than that of iron, in the matte smelting process with different oxidation degrees, nickel, cobalt, and iron oxides react under the action of sulfiding agent to generate Ni3S2, CoS, and FeS, while iron sulfides are continuously oxidized into oxides in stages. Subsequently, they are removed by slag formation with gangue. The reduction sulfidation generates cobalt-rich low-nickel matte and molten slag.

[0120] The mass ratio of molten blowing slag, quartz, anthracite, and sulfur is 1:0.11:0.01:0.01.

[0121] The fuel is natural gas, and the natural gas injection rate is 1% of the mass of the molten blowing slag.

[0122] (9) Add molten slag and quartz to an oxidation furnace for oxidation and smelting. Blow in oxygen to control the molten oxidation atmosphere and raise the temperature to 1390℃. Then, lower the temperature to 1150℃ at a cooling rate of 5℃ / min. After crystallization, nickel-cobalt magnetite is generated. The nickel-cobalt magnetite is first separated into nickel-cobalt magnetite concentrate and tailings by 4100GS strong magnetic separation. The nickel-cobalt magnetite concentrate is then separated into iron concentrate and cobalt-nickel matte by 2100GS weak magnetic separation.

[0123] The mass ratio of molten slag to quartz is 1:0.15.

[0124] (10) Cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, coke, and quartz are added to a side-blown furnace for refining, and preheated compressed air is blown in (the blowing rate is 10000 Nm). 3 / h), under the temperature of 1210℃, the de-iron, desulfurization, slag making and blowing operations are carried out continuously to produce high-grade nickel matte and molten blowing slag. The molten high-grade nickel matte is continuously discharged through the metal discharge siphon, and the molten blowing slag (at this time, it can be determined whether it needs to be extracted again through steps (8) to (10) according to the amount of molten blowing slag) is continuously discharged from the slag discharge overflow outlet.

[0125] The mass ratio of cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, coke, and quartz is 1:0.1:0.08:0.25.

[0126] Example 2

[0127] A method for processing laterite nickel ore includes the following steps:

[0128] (1) The laterite nickel ore is screened and crushed in multiple stages to make the ore particle size 5mm. The free water of the laterite nickel ore is dried and removed by a drying kiln, so that the moisture content of the deeply dried and dehydrated laterite nickel ore is 24%, and the crushed material is obtained.

[0129] Laterite nickel ore comprises the following main mass components: 3.34% Ni, 0.01% Co, 39.43% SiO2, 17.49% MgO, and 10% Fe;

[0130] (2) Add crushed material, quartz, anthracite and gypsum into a disc pellet mill for mixing and pelletizing. The pelletizing rate is 96% and the mixed pellet diameter is 30mm to obtain laterite nickel ore pellets.

[0131] The mass ratio of the crushed material, quartz, anthracite, and gypsum is 1:0.02:0.02:0.22.

[0132] (3) Laterite nickel ore pellets, quartz, coke, and pyrite are added to the smelting furnace through the charging port for smelting. Fuel, preheated compressed air, and oxygen are added to the furnace through a lance. The oxygen-enriched air blown in strongly stirs the high-temperature mixed melt, causing turbulent movement throughout the melt in this area. This promotes the rapid and uniform distribution of the added materials in the melt. Mass and heat transfer processes are achieved between the high-temperature mixed melt and the furnace charge, and between the melt and the blown gas. The melt in the upper part of the furnace is called the slag-nickel matte emulsion phase, which contains 96% (by volume) of the slag-nickel matte emulsion phase. The slag and 3% (by volume) of sulfides and metal particles are subjected to intense agitation in this area, causing the metals or sulfides generated by reduction sulfidation to collide and merge with each other. Once the kinetic stability condition is reached, i.e. the particles aggregate and grow to 0.3 mm, they can quickly fall from the upper bubbling zone into the lower bottom phase. The melt in the lower part of the furnace is separated into molten reduced sulfide slag and molten low-grade nickel matte under the action of gravity. The molten reduced sulfide slag and molten low-grade nickel matte enter the slag chamber through the duct. The molten reduced sulfide slag overflows and is discharged, while the molten low-grade nickel matte is discharged through the siphon under pressure.

[0133] The mass ratio of laterite nickel ore pellets, quartz, coke, and pyrite is 1:0.12:0.1:0.02.

[0134] The fuel is heavy oil, and the fuel ratio is 50% of the mass of laterite nickel ore pellets. The preheated compressed air injection rate is 20,000 Nm³. 3 / h; the oxygen purity is 98%, the oxygen-enriched air volume concentration in the furnace is 85%, the fuel excess coefficient is 95%, the total furnace smelting coefficient is 70%, and the smelting temperature is controlled at 1620℃; the composition of the molten low-nickel matte is: Ni 32%, Co 0.1%, Fe 25%, S 30%. The main chemical composition of the molten reduction sulfide slag is: Ni 0.5%, Co 0.011%, Fe 46%.

[0135] (4) The molten reduction sulfide slag is added to the depletion electric furnace for depletion sedimentation and separation. The temperature of the electric furnace is controlled at 1480℃. During this period, the depleted cobalt low-nickel matte droplets are continuously separated from the slag and settled to the bottom of the furnace for enrichment. They are discharged through the metal discharge port to obtain depleted cobalt low-nickel matte. The slag after separating the depleted cobalt low-nickel matte becomes electric furnace slag.

[0136] (5) Add electric furnace slag, quartz, anthracite, and sulfur to the reduction sulfidation device to carry out the reduction sulfidation reaction. Blow fuel and oxygen-enriched air into the molten pool to rapidly raise the temperature, so that the valuable elements of nickel and cobalt in the slag can undergo the reduction sulfidation reaction to obtain cobalt-poor low-grade nickel matte and reduction slag. According to the height of the molten pool of the reduction fusion furnace, the reduction slag is discharged into the slag bag at regular intervals. The slag bag filled with reduction slag is transported to the slag bag yard by slag bag car, and the reduction slag is naturally cooled for 48 hours, and then water is sprayed onto the reduction slag for 38 hours to cool it.

[0137] The mass ratio of electric furnace slag, quartz, anthracite, and sulfur is 1:0.1:0.01:0.15.

[0138] The fuel used is natural gas, and the amount of coating applied is 30% of the mass of the electric furnace slag.

[0139] (6) The cooled reducing slag is crushed and ground to -300 mesh to make slag ore. The slag ore, methyl isobutyl methanol, Na2S and oxoalkanol black powder are mixed and floated to obtain nickel-cobalt concentrate and first tailings slag. The first tailings slag is magnetically separated to obtain nickel-cobalt alloy and second tailings slag. The second tailings slag can be sold directly.

[0140] The mass ratio of raw slag ore, methyl isobutyl methanol, Na2S, and oxoalkanol black powder is 1 ton (t): 55g: 45g: 230g.

[0141] (7) Molten low-nickel matte, low-cobalt low-nickel matte, low-cobalt low-matte, nickel-cobalt concentrate, nickel-cobalt alloy, coke, and quartz are added to a side-blown furnace for refining, and preheated compressed air is blown in (the blowing rate is 33000 Nm). 3 At a temperature of 1350℃, the de-ironization, desulfurization, slag-forming and blowing operations are carried out continuously to produce high-grade nickel matte and molten blowing slag. The molten high-grade nickel matte is continuously discharged through the metal discharge siphon, and the molten blowing slag is continuously discharged from the slag discharge overflow outlet.

[0142] The mass ratio of molten low-nickel matte, low-cobalt low-nickel matte, low-cobalt low-matte, nickel-cobalt concentrate, nickel-cobalt alloy, coke, and quartz is 1:0.5:0.1:0.5:0.01:0.05.

[0143] The main components of high-grade nickel matte are: Ni 85%, Co 4.5%, S 4%, and Fe 3%; the main chemical components of molten blowing slag are: Ni 0.1%, Co 0.01%, and Fe 52%.

[0144] (8) Molten blowing slag, quartz, anthracite, and gypsum are added to the reduction sulfidation device to carry out reduction sulfidation reaction. Fuel is injected and oxygen-enriched air is blown in to provide heat to the molten pool. Taking advantage of the fact that the affinity of metallic nickel for sulfur is close to that of iron, while its affinity for oxygen is much less than that of iron, in the matte smelting process with different oxidation degrees, nickel, cobalt and iron oxides react under the action of sulfiding agent to generate Ni3S2, CoS and FeS, while iron sulfides are continuously oxidized into oxides in stages. Subsequently, they are removed by slag formation with gangue. Reduction sulfidation generates cobalt-rich low-nickel matte and molten slag.

[0145] The mass ratio of molten blowing slag, quartz, anthracite, and gypsum is 1:0.01:0.12:0.18.

[0146] The fuel is natural gas, and the natural gas injection rate is 9% of the mass of the molten blowing slag.

[0147] (9) Molten slag and quartz are added to an oxidation furnace for oxidation and smelting. Oxygen is blown in to control the molten oxidation atmosphere and the temperature is raised to 1560℃. Then, the temperature is lowered to 1350℃ at a cooling rate of 50℃ / min. After crystallization, nickel-cobalt magnetite is generated. The nickel-cobalt magnetite is first separated into nickel-cobalt magnetite concentrate and tailings by 8200GS strong magnetic separation. The nickel-cobalt magnetite concentrate is separated into iron concentrate and cobalt-nickel matte by 3500GS weak magnetic separation.

[0148] The mass ratio of molten slag to quartz is 1:0.01.

[0149] (10) Cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, coke, and quartz are added to a side-blown furnace for refining, and preheated compressed air is blown in (the blowing rate is 33000 Nm). 3 / h), at a temperature of 1350℃, the de-iron, desulfurization, slag-making and blowing operations are carried out continuously to produce high-grade nickel matte and molten blowing slag. The molten high-grade nickel matte is continuously discharged through the metal discharge siphon, and the molten blowing slag (at this time, it can be determined whether it needs to be extracted again through steps (8) to (10) according to the amount of molten blowing slag) is continuously discharged from the slag discharge overflow outlet.

[0150] The mass ratio of cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, coke, and quartz is 1:0.7:0.01:0.05.

[0151] Example 3

[0152] A method for processing laterite nickel ore includes the following steps:

[0153] (1) The laterite nickel ore is screened and crushed in multiple stages to make the particle size 2mm. The free water of the laterite nickel ore is dried and removed by a drying kiln to make the moisture content of the deeply dried and dehydrated laterite nickel ore 15%, and the crushed material is obtained.

[0154] Laterite nickel ore comprises the following main mass components: 2.39% Ni, 0.09% Co, 31.42% SiO2, 11.47% MgO, and 28.16% Fe;

[0155] (2) Add crushed material, quartz, anthracite and gypsum into a disc pelletizer for mixing and pelletizing. The pelletizing rate is 96% and the mixed pellet diameter is 18mm to obtain laterite nickel ore pellets.

[0156] The mass ratio of the crushed material, quartz, anthracite, and gypsum is 1:0.06:0.08:0.1173.

[0157] (3) Laterite nickel ore pellets, quartz, anthracite, and gypsum are added to the smelting furnace through the charging port for smelting. Fuel, preheated compressed air, and oxygen are added to the furnace through a spray gun. The oxygen-enriched air blown in strongly stirs the high-temperature mixed melt, causing turbulent movement throughout the melt in this area. This promotes the rapid and uniform distribution of the added materials in the melt. Mass and heat transfer processes are achieved between the high-temperature mixed melt and the furnace charge, and between the melt and the blown gas. The melt in the upper part of the furnace is called the slag-nickel matte emulsion phase, which contains 88% (by volume) of the slag-nickel matte emulsion phase. The slag and 7% (by volume) of sulfides and metal particles are subjected to intense agitation in this area, causing the metals or sulfides generated by reduction sulfidation to collide and merge with each other. Once the kinetic stability condition is reached, i.e. the particles aggregate and grow to 3.2 mm, they can quickly fall from the upper bubbling zone into the lower bottom phase. The melt in the lower part of the furnace is separated into molten reduced sulfide slag and molten low-grade nickel matte under the action of gravity. The molten reduced sulfide slag and molten low-grade nickel matte enter the slag chamber through the duct. The molten reduced sulfide slag overflows and is discharged, while the molten low-grade nickel matte is discharged through the siphon under pressure.

[0158] The mass ratio of laterite nickel ore pellets, quartz, anthracite, and gypsum is 1:0.09:0.075:0.1.

[0159] The fuel is heavy oil, and the fuel input is 30% of the mass of laterite nickel ore pellets. The preheated compressed air injection rate is 15000 Nm³. 3 / h; the oxygen purity is 97%, the oxygen-enriched air volume concentration in the furnace is 82%, the fuel combustion excess coefficient is 88%, the overall furnace smelting coefficient is 90%, and the smelting temperature is controlled at 1550℃; the composition of the molten low-nickel matte is: Ni 18.97%, Co 0.53%, Fe 51.20%, S 18.34%. The main chemical composition of the molten reduction sulfide slag is: Ni 0.19%, Co 0.008%, Fe 36.79%.

[0160] (4) The molten reduction sulfide slag is added to the depletion electric furnace for depletion sedimentation and separation. The temperature of the electric furnace is controlled at 1300℃. During this period, the depleted cobalt low-nickel matte droplets are continuously separated from the slag, settled to the bottom of the furnace and enriched, and discharged through the metal discharge port to obtain depleted cobalt low-nickel matte. The slag after separating the depleted cobalt low-nickel matte becomes electric furnace slag.

[0161] (5) Add electric furnace slag, quartz, anthracite, and sulfur to the reduction sulfidation device to carry out the reduction sulfidation reaction. Blow fuel and oxygen-enriched air into the molten pool to rapidly raise the temperature, so that the valuable elements of nickel and cobalt in the slag can undergo the reduction sulfidation reaction to obtain cobalt-poor low-grade nickel matte and reduction slag. According to the height of the molten pool of the reduction fusion furnace, the reduction slag is discharged into the slag bag at regular intervals. The slag bag filled with reduction slag is transported to the slag bag yard by slag bag car, and the reduction slag is naturally cooled for 30 hours, and then water is sprayed onto the reduction slag for 23 hours to cool it.

[0162] The mass ratio of electric furnace slag, quartz, anthracite, and pyrite is 1:0.04:0.08:0.11.

[0163] The fuel used is pulverized coal, and the amount of coating applied is 12% of the mass of the electric furnace slag.

[0164] (6) The cooled reducing slag is crushed and ground to -200 mesh to make slag ore. The slag ore, triethoxybutane, Na2S, pentyl xanthate and hexyl xanthate are mixed and floated to obtain nickel-cobalt concentrate and first tailings slag. The first tailings slag is magnetically separated to obtain nickel-cobalt alloy and second tailings slag. The second tailings slag can be sold directly.

[0165] The mass ratio of raw slag ore, triethoxybutane, Na2S, pentyl xanthate and hexyl xanthate is 1 ton (t): 31g: 201g: 78g: 78g.

[0166] (7) Molten low-nickel matte, low-cobalt low-nickel matte, low-cobalt low-matte, nickel-cobalt concentrate, nickel-cobalt alloy, coke, and quartz are added to a side-blown furnace for refining, and preheated compressed air is blown in (the blowing rate is 25-100 Nm). 3 At a temperature of 1301℃, the de-ironization, desulfurization, slag-forming and blowing operations are carried out continuously to produce high-grade nickel matte and molten blowing slag. The molten high-grade nickel matte is continuously discharged through the metal discharge siphon, and the molten blowing slag is continuously discharged from the slag discharge overflow outlet.

[0167] The mass ratio of molten low-nickel matte, low-cobalt low-nickel matte, low-cobalt low-matte, nickel-cobalt concentrate, nickel-cobalt alloy, coke, and quartz is 1:0.3:0.2:0.15:0.03:0.08.

[0168] The main components of high-grade nickel matte are: Ni 80.13%, Co 2.38%, S 10.21%, and Fe 6.79%; the main chemical components of molten blowing slag are: Ni 0.42%, Co 0.14%, and Fe 35.89%.

[0169] (8) Molten blowing slag, quartz, anthracite, and gypsum are added to the reduction sulfidation device to carry out reduction sulfidation reaction. Fuel is injected and oxygen-enriched air is blown in to provide heat to the molten pool. Taking advantage of the fact that the affinity of metallic nickel for sulfur is close to that of iron, while its affinity for oxygen is much less than that of iron, in the matte smelting process with different oxidation degrees, nickel, cobalt and iron oxides react under the action of sulfiding agent to generate Ni3S2, CoS and FeS, while iron sulfides are continuously oxidized into oxides in stages. Subsequently, they are removed by slag formation with gangue. Reduction sulfidation generates cobalt-rich low-nickel matte and molten slag.

[0170] The mass ratio of molten blowing slag, quartz, anthracite, and gypsum is 1:0.05:0.1025:0.13.

[0171] The fuel is pulverized coal, and the amount of pulverized coal injected is 7% of the mass of the molten blowing slag.

[0172] (9) Molten slag and quartz are added to an oxidation furnace for oxidation and smelting. Oxygen is blown in to control the molten oxidation atmosphere and the temperature is raised to 1460℃. Then, the temperature is lowered to 1320℃ at a cooling rate of 20℃ / min. After crystallization, nickel-cobalt magnetite is generated. The nickel-cobalt magnetite is first separated into nickel-cobalt magnetite concentrate and tailings by 5000GS strong magnetic separation. The nickel-cobalt magnetite concentrate is separated into iron concentrate and cobalt-nickel matte by 2900GS weak magnetic separation.

[0173] The mass ratio of molten slag to quartz is 1:0.08.

[0174] (10) Cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, coke, and quartz are added to a side-blown furnace for refining, and preheated compressed air is blown in (the blowing rate is 25-100 Nm). 3 / h), at a temperature of 1301℃, the de-iron, desulfurization, slag-making and blowing operations are carried out continuously to produce high-grade nickel matte and molten blowing slag. The molten high-grade nickel matte is continuously discharged through the metal discharge siphon, and the molten blowing slag (at this time, it can be determined whether it needs to be extracted again through steps (8) to (10) according to the amount of molten blowing slag) is continuously discharged from the slag discharge overflow outlet.

[0175] The mass ratio of cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, coke, and quartz is 1:0.2:0.03:0.1.

[0176] Example 4

[0177] A method for processing laterite nickel ore includes the following steps:

[0178] (1) The laterite nickel ore is screened and crushed in multiple stages to make the ore particle size 6.5mm. The free water of the laterite nickel ore is removed by drying kiln to make the moisture content of the deeply dried and dehydrated laterite nickel ore 19%, and the crushed material is obtained.

[0179] Laterite nickel ore comprises the following main mass components: 1.98% Ni, 0.09% Co, 16.78% SiO2, 8.43% MgO, and 21.37% Fe;

[0180] (2) Add crushed material, quartz, anthracite and sulfur to a disc pellet mill for mixing and pelletizing. The pelletizing rate is 96% and the mixed pellet diameter is 13.5 mm, thus obtaining laterite nickel ore pellets.

[0181] The mass ratio of crushed material, quartz, anthracite, and sulfur is 1:0.1032:0.1487:0.1684.

[0182] (3) Laterite nickel ore pellets, quartz, coke, and gypsum are added to the smelting furnace through the charging port for smelting. Fuel, preheated compressed air, and oxygen are added to the furnace through a lance. The oxygen-enriched air blown in strongly stirs the high-temperature mixed melt, causing turbulent movement throughout the melt in this area. This promotes the rapid and uniform distribution of the added materials in the melt. Mass and heat transfer processes are achieved between the high-temperature mixed melt and the furnace charge, and between the melt and the blown gas. The melt in the upper part of the furnace is called the slag-nickel matte emulsion phase, which contains 88% (by volume) of the furnace charge. The slag contains 10% (by volume) sulfides and metal particles. Due to the intense stirring in this area, the metals or sulfides generated by the reduction sulfidation collide and merge with each other. Once the kinetic stability condition is reached, i.e. the particles aggregate and grow to 3.5 mm, they can quickly fall from the upper bubbling zone into the lower bottom phase. Under the action of gravity, the melt in the lower part of the furnace is divided into molten reduced sulfidation slag and molten low-grade nickel matte. The molten reduced sulfidation slag and molten low-grade nickel matte enter the slag chamber through the duct. The molten reduced sulfidation slag overflows and is discharged, while the molten low-grade nickel matte is discharged through the siphon under pressure.

[0183] The mass ratio of laterite nickel ore pellets, quartz, coke, and gypsum is 1:0.089:0.076:0.105.

[0184] The fuel is heavy oil, and the fuel input is 30.65% of the mass of laterite nickel ore pellets. The preheated compressed air injection rate is 17000 Nm³. 3 / h; the oxygen purity is 96%, the volume concentration of oxygen-enriched air in the furnace is 72%, the fuel excess coefficient is 86%, the total furnace smelting coefficient is 92%, and the smelting temperature is controlled at 1480℃; the composition of the molten low-nickel matte is: Ni 21.34%, Co 1.1%, Fe 48.35%, S 24.26%. The main chemical composition of the molten reduction sulfide slag is: Ni 0.13%, Co 0.02%, Fe 28.94%.

[0185] (4) The molten reduction sulfide slag is added to the depletion electric furnace for depletion sedimentation and separation. The temperature of the electric furnace is controlled at 1310℃. During this period, the depleted cobalt low-nickel matte droplets are continuously separated from the slag, settled to the bottom of the furnace and enriched, and discharged through the metal discharge port to obtain depleted cobalt low-nickel matte. The slag after separating the depleted cobalt low-nickel matte becomes electric furnace slag.

[0186] (5) Add electric furnace slag, quartz, anthracite and pyrite to the reduction sulfidation device to carry out reduction sulfidation reaction. Blow fuel and oxygen-enriched air into the molten pool to quickly raise the temperature so that the valuable elements of nickel and cobalt in the slag can undergo reduction sulfidation reaction to obtain cobalt-poor low-grade nickel matte and reduction slag. According to the height of the molten pool of the reduction fusion furnace, the reduction slag is discharged into the slag bag at regular intervals. The slag bag filled with reduction slag is transported to the slag bag yard by slag bag car and the reduction slag is naturally cooled for 31 hours, and then water is sprayed onto the reduction slag for 22 hours to cool it.

[0187] The mass ratio of electric furnace slag, quartz, anthracite, and pyrite is 1:0.075:0.11:0.088.

[0188] The fuel used is pulverized coal, and the amount of coating applied is 23% of the mass of the electric furnace slag.

[0189] (6) The cooled reducing slag is crushed and ground to -200 mesh to make slag ore. The slag ore, No. 2 oil, Na2S, phenol black reagent and alcohol black reagent are mixed and floated to obtain nickel cobalt concentrate and first tailings slag. The first tailings slag is magnetically separated to obtain nickel cobalt alloy and second tailings slag. The second tailings slag can be sold directly.

[0190] The mass ratio of slag ore, No. 2 oil, Na2S, phenol black and alcohol black is 1 ton (t): 35g: 210g: 71.5g: 71.5g.

[0191] (7) Molten low-nickel matte, low-cobalt low-nickel matte, low-cobalt low-matte, nickel-cobalt concentrate, nickel-cobalt alloy, graphite powder, and quartz are added to a side-blown furnace for refining, and preheated compressed air is blown in (the blowing rate is 28000 Nm). 3 At a temperature of 1290℃, the de-ironization, desulfurization, slag-forming and blowing operations are carried out continuously to produce high-grade nickel matte and molten blowing slag. The molten high-grade nickel matte is continuously discharged through the metal discharge siphon, and the molten blowing slag is continuously discharged from the slag discharge overflow outlet.

[0192] The mass ratio of molten low-nickel matte, low-cobalt low-nickel matte, low-cobalt low-glucopyranite, nickel-cobalt concentrate, nickel-cobalt alloy, graphite powder, and quartz is 1:0.4:0.3:0.25:0.04:0.2.

[0193] The main components of high-grade nickel matte are: Ni 71.43%, Co 3.89%, S 15.62%, and Fe 7.62%; the main chemical components of the blowing slag are: Ni 1.32%, Co 0.14%, and Fe 39.78%.

[0194] (8) Molten blowing slag, quartz, anthracite, and gypsum are added to the reduction sulfidation device to carry out reduction sulfidation reaction. Fuel is injected and oxygen-enriched air is blown in to provide heat to the molten pool. Taking advantage of the fact that the affinity of metallic nickel for sulfur is close to that of iron, while its affinity for oxygen is much less than that of iron, in the matte smelting process with different oxidation degrees, nickel, cobalt and iron oxides react under the action of sulfiding agent to generate Ni3S2, CoS and FeS, while iron sulfides are continuously oxidized into oxides in stages. Subsequently, they are removed by slag formation with gangue. Reduction sulfidation generates cobalt-rich low-nickel matte and molten slag.

[0195] The mass ratio of molten blowing slag, quartz, anthracite, and gypsum is 1:0.0692:0.00834:0.01065.

[0196] The fuel is pulverized coal, and the amount of pulverized coal injected is 7.5% of the mass of the molten blowing slag.

[0197] (9) Molten slag and quartz are added to an oxidation furnace for oxidation and smelting. Oxygen is blown in to control the molten oxidation atmosphere and the temperature is raised to 1470℃. Then, the temperature is lowered to 1235℃ at a cooling rate of 42℃ / min. After crystallization, nickel-cobalt magnetite is generated. The nickel-cobalt magnetite is first separated into nickel-cobalt magnetite concentrate and tailings by 6300GS strong magnetic separation. The nickel-cobalt magnetite concentrate is separated into iron concentrate and cobalt-nickel matte by 2600GS weak magnetic separation.

[0198] The mass ratio of molten slag to quartz is 1:0.1252.

[0199] (10) Cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, coke, and quartz are added to a side-blown furnace for refining, and preheated compressed air is blown in (the blowing rate is 28000 Nm). 3 / h), at a temperature of 1290℃, the de-iron, desulfurization, slag-making and blowing operations are carried out continuously to produce high-grade nickel matte and molten blowing slag. The molten high-grade nickel matte is continuously discharged through the metal discharge siphon, and the molten blowing slag (at this time, it can be determined whether it needs to be extracted again through steps (8) to (10) according to the amount of molten blowing slag) is continuously discharged from the slag discharge overflow outlet.

[0200] The mass ratio of cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, coke, and quartz is 1:0.35:0.04:0.15.

[0201] Example 5

[0202] A method for processing laterite nickel ore includes the following steps:

[0203] (1) The laterite nickel ore is screened and crushed in multiple stages to make the ore particle size 2mm. The free water of the laterite nickel ore is dried and removed by a drying kiln, so that the moisture content of the deeply dried and dehydrated laterite nickel ore is 16%, and the crushed material is obtained.

[0204] Laterite nickel ore comprises the following main mass components: 1.63% Ni, 0.13% Co, 10.37% SiO2, 12.34% MgO, and 36.79% Fe;

[0205] (2) Add crushed material, quartz, anthracite and sulfur to a disc pellet mill for mixing and pelletizing. The pelletizing rate is 96% and the mixed pellet diameter is 20mm to obtain laterite nickel ore pellets.

[0206] The mass ratio of crushed material, quartz, anthracite, and sulfur is 1:0.07:0.0789:0.18.

[0207] (3) Laterite nickel ore pellets, quartz, anthracite, and gypsum are added to the smelting furnace through the charging port for smelting. Fuel, preheated compressed air, and oxygen are added to the furnace through a spray gun. The oxygen-enriched air blown in strongly stirs the high-temperature mixed melt, causing turbulent movement throughout the melt in this area. This promotes the rapid and uniform distribution of the added materials in the melt. Mass and heat transfer processes are achieved between the high-temperature mixed melt and the furnace charge, and between the melt and the blown gas. The melt in the upper part of the furnace is called the slag-nickel matte emulsion phase, which contains 88% (by volume) of the slag-nickel matte emulsion phase. The slag and 10% (by volume) of sulfides and metal particles are subjected to intense agitation in this area, causing the metals or sulfides generated by reduction sulfidation to collide and merge with each other. Once the kinetic stability condition is reached, i.e. the particles aggregate and grow to 3.5 mm, they can quickly fall from the upper bubbling zone into the lower bottom phase. The melt in the lower part of the furnace is separated into molten reduced sulfide slag and molten low-grade nickel matte under the action of gravity. The molten reduced sulfide slag and molten low-grade nickel matte enter the slag chamber through the duct. The molten reduced sulfide slag overflows and is discharged, while the molten low-grade nickel matte is discharged through the siphon under pressure.

[0208] The mass ratio of laterite nickel ore pellets, quartz, anthracite, and gypsum is 1:0.05:0.07:0.087.

[0209] The fuel is natural gas, and the fuel ratio is 39% of the mass of laterite nickel ore pellets. The preheated compressed air injection rate is 16800 Nm³. 3 / h; the oxygen purity is 97%, the oxygen-enriched air volume concentration in the furnace is 82%, the fuel excess coefficient is 94%, the overall furnace smelting coefficient is 76%, and the smelting temperature is controlled at 1530℃; the composition of the molten low-nickel matte is: Ni 28.39%, Co 0.91%, Fe 53.76%, S 15.47%. The main chemical composition of the molten reduction sulfide slag is: Ni 0.34%, Co 0.07%, Fe 33.46%.

[0210] (4) The molten reduction sulfide slag is added to the depletion electric furnace for depletion sedimentation and separation. The temperature of the electric furnace is controlled at 1420℃. During this period, the depleted cobalt low-nickel matte droplets are continuously separated from the slag, settled to the bottom of the furnace and enriched, and discharged through the metal discharge port to obtain depleted cobalt low-nickel matte. The slag after separating the depleted cobalt low-nickel matte becomes electric furnace slag.

[0211] (5) Add electric furnace slag, quartz, semi-coke and sulfur to the reduction sulfidation device to carry out reduction sulfidation reaction. Blow fuel and oxygen-enriched air into the molten pool to quickly raise the temperature so that the valuable elements of nickel and cobalt in the slag can undergo reduction sulfidation reaction to obtain cobalt-poor low-grade nickel matte and reduction slag. According to the height of the molten pool of the reduction fusion furnace, the reduction slag is discharged into the slag bag at regular intervals. The slag bag filled with reduction slag is transported to the slag bag yard by slag bag car and the reduction slag is naturally cooled for 40 hours, and then water is sprayed onto the reduction slag for 31 hours to cool it.

[0212] The mass ratio of electric furnace slag, quartz, semi-coke, and sulfur is 1:0.08:0.064:0.13.

[0213] The fuel used is pulverized coal, and the amount of coating applied is 23% of the mass of the electric furnace slag.

[0214] (6) The cooled reducing slag is crushed and ground to -200 mesh to make slag ore. The slag ore, polyethylene glycol ether, Na2S, isopropyl xanthate and isobutyl xanthate are mixed and floated to obtain nickel-cobalt concentrate and first tailings slag. The first tailings slag is magnetically separated to obtain nickel-cobalt alloy and second tailings slag. The second tailings slag can be sold directly.

[0215] The mass ratio of raw slag ore, polyethylene glycol ether, Na2S, isopropyl xanthate and isobutyl xanthate is 1 ton (t): 49g: 270g: 90g: 90g.

[0216] (7) Molten low-nickel matte, low-cobalt low-nickel matte, low-cobalt low-matte, nickel-cobalt concentrate, nickel-cobalt alloy, graphite powder, and quartz are added to a side-blown furnace for refining, and preheated compressed air is blown in (the blowing rate is 24000 Nm). 3 At a temperature of 1260℃, the de-ironization, desulfurization, slag-forming and blowing operations are carried out continuously to produce high-grade nickel matte and molten blowing slag. The molten high-grade nickel matte is continuously discharged through the metal discharge siphon, and the molten blowing slag is continuously discharged from the slag discharge overflow outlet.

[0217] The mass ratio of molten low-nickel matte, cobalt-poor low-nickel matte, cobalt-poor low-nickel matte, nickel-cobalt concentrate, nickel-cobalt alloy, graphite powder, and quartz is 1:0.35:0.55:0.1:0.06:0.12.

[0218] The main components of high-grade nickel matte are: Ni 79.81%, Co 4.3%, S 7.65%, and Fe 7.34%; the main chemical components of the blowing slag are: Ni 1.82%, Co 0.24%, and Fe 34.59%.

[0219] (8) Molten blowing slag, quartz, graphite powder and gypsum are added to the reduction sulfidation device to carry out reduction sulfidation reaction. Fuel is injected and oxygen-enriched air is blown in to provide heat to the molten pool. Taking advantage of the fact that the affinity of metallic nickel for sulfur is close to that of iron, while its affinity for oxygen is much less than that of iron, in the matte smelting process with different oxidation degrees, nickel, cobalt and iron oxides react under the action of sulfiding agent to generate Ni3S2, CoS and FeS, while iron sulfides are continuously oxidized into oxides in stages. Subsequently, they are removed by slag formation with gangue. Reduction sulfidation generates cobalt-rich low-nickel matte and molten slag.

[0220] The mass ratio of molten blowing slag, quartz, graphite powder, and gypsum is 1:0.076:0.055:0.15.

[0221] The fuel is natural gas, and the natural gas injection rate is 7% of the mass of the molten blowing slag.

[0222] (9) Molten slag and quartz are added to an oxidation furnace for oxidation and smelting. Oxygen is blown in to control the molten oxidation atmosphere and the temperature is raised to 1440℃. Then, the temperature is lowered to 1230℃ at a cooling rate of 38℃ / min. After crystallization, nickel-cobalt magnetite is generated. The nickel-cobalt magnetite is first separated into nickel-cobalt magnetite concentrate and tailings by 4300GS strong magnetic separation. The nickel-cobalt magnetite concentrate is separated into iron concentrate and cobalt-nickel matte by 2400GS weak magnetic separation.

[0223] The mass ratio of molten slag to quartz is 1:0.09.

[0224] (10) Cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, coke, and quartz are added to a side-blown furnace for refining, and preheated compressed air is blown in (the blowing rate is 24000 Nm). 3 / h), at a temperature of 1260℃, the de-iron, desulfurization, slag-making and blowing operations are carried out continuously to produce high-grade nickel matte and molten blowing slag. The molten high-grade nickel matte is continuously discharged through the metal discharge siphon, and the molten blowing slag (at this time, it can be determined whether it needs to be extracted again through steps (8) to (10) according to the amount of molten blowing slag) is continuously discharged from the slag discharge overflow outlet.

[0225] The mass ratio of cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, coke, and quartz is 1:0.5:0.06:0.2.

[0226] Test case

[0227] The main element contents of the high nickel matte products prepared in Examples 1 to 5 are shown in Table 1.

[0228] Main metal content (%) Example 1 Example 2 Example 3 Example 4 Example 5 Ni 55.00 85.00 80.13 71.43 79.81 Co 1.00 4.50 2.38 3.89 4.30 S 16.00 4.00 10.21 15.62 7.65

[0229] The nickel-cobalt recovery rates of Examples 1-5 are shown in Table 2.

[0230]

[0231]

[0232] As can be seen from Tables 1 and 3, this application can fully extract the components of laterite nickel ore, with nickel and cobalt being fully recovered. The recovery rate of nickel reaches 87-99%, and the recovery rate of cobalt reaches 76-98%, which has extremely high economic value.

[0233] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit the scope of protection of this application. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the substance and scope of the technical solutions of this application.

Claims

1. A method for processing lateritic nickel ore, characterized in that, Includes the following steps: (1) The laterite nickel ore is screened, crushed and dried to obtain the crushed material; (2) The crushed material, the first flux, the first reducing agent and the first sulfiding agent are mixed and granulated to obtain laterite nickel ore pellets; (3) The laterite nickel ore pellets, the second flux, the second reducing agent and the second sulfiding agent are smelted to obtain molten reduced sulfidation slag and molten low-nickel matte; (4) The molten reduction sulfide slag is depleted and settled to obtain cobalt-poor low-nickel matte and electric furnace slag; (5) Add electric furnace slag, third flux, third reducing agent and third sulfiding agent to the reduction sulfidation device to carry out reduction sulfidation reaction to obtain cobalt-poor low-cobalt nickel matte and reduction slag; (6) Grind the reducing slag to obtain the slag ore. Mix the slag ore, frother, activator and collector and then perform flotation to obtain nickel-cobalt concentrate and the first tailings slag. Separate the first tailings slag by magnetic separation to obtain nickel-cobalt alloy and the second tailings slag. (7) Molten low-nickel matte, low-cobalt low-nickel matte, low-cobalt low-matte, nickel-cobalt concentrate, nickel-cobalt alloy, fourth reducing agent and fourth flux are added to a side-blown furnace for smelting to obtain high-matte and molten smelting slag.

2. The method for processing laterite nickel ore according to claim 1, characterized in that, It also includes the following steps: (8) Add the molten blowing slag, the fifth flux, the fifth reducing agent and the fourth sulfiding agent to the reduction sulfidation device to carry out the reduction sulfidation reaction to obtain cobalt-rich low-nickel matte and molten slag; (9) The molten slag and the sixth flux are added to the oxidizing furnace for oxidizing and smelting to obtain nickel-cobalt magnetite. The nickel-cobalt magnetite is separated by the first magnetic separation to obtain nickel-cobalt magnetite concentrate and tailings. The nickel-cobalt magnetite concentrate is separated by the second magnetic separation to obtain iron concentrate and cobalt-nickel matte ore. (10) Cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, sixth reducing agent and seventh flux are added to a side-blown furnace for smelting to obtain high-grade nickel matte and molten smelting slag.

3. The method for processing lateritic nickel ore according to claim 1 or 2, characterized in that, The first flux, the second flux, the third flux, the fourth flux, the fifth flux, the sixth flux, and the seventh flux are each independently selected from at least one of quartz and limestone.

4. The method for processing laterite nickel ore according to claim 1 or 2, characterized in that, The first reducing agent, the second reducing agent, the third reducing agent, the fourth reducing agent, the fifth reducing agent, and the sixth reducing agent are each independently selected from at least one of semi-coke, coke, anthracite, and graphite powder.

5. The method for processing laterite nickel ore according to claim 1 or 2, characterized in that, The first sulfiding agent, the second sulfiding agent, the third sulfiding agent, and the fourth sulfiding agent are each independently selected from at least one of sulfur, pyrite, gypsum, and sulfur-containing minerals.

6. The method for processing lateritic nickel ore according to claim 2, characterized in that, The mass ratio of the crushed material, the first flux, the first reducing agent, and the first vulcanizing agent is 1:(0.02~0.13):(0.02~0.17):(0.03~0.22); and / or The mass ratio of the laterite nickel ore pellets, the second flux, the second reducing agent, and the second sulfiding agent is 1:(0.02~0.12):(0.02~0.1):(0.02~0.13); and / or The mass ratio of the electric furnace slag, the third flux, the third reducing agent, and the third sulfiding agent is 1:(0.01~0.1):(0.01~0.13):(0.03~0.15); and / or The mass ratio of the molten low-nickel matte, low-cobalt low-nickel matte, low-cobalt low-matte, nickel-cobalt concentrate, nickel-cobalt alloy, fourth reducing agent, and fourth flux is 1:(0.2-0.5):(0.1-0.6):(0.05-0.5):(0.01-0.07):(0.05-0.25); and / or The mass ratio of the molten blowing slag, the fifth flux, the fifth reducing agent, and the fourth sulfiding agent is 1:(0.01~0.11):(0.01~0.12):(0.02~0.18); and / or The mass ratio of the molten slag to the sixth flux is 1:(0.01~0.15):(0.06~0.2). The mass ratio of the cobalt-rich low-nickel matte, cobalt-rich nickel matte ore, the sixth reducing agent, and the seventh flux is 1:(0.1-0.7):(0.01-0.08).

7. The method for processing lateritic nickel ore according to claim 1, characterized in that, The foaming agent includes at least one of No. 2 oil, polyethylene glycol ether, methyl isobutyl methanol, and triethoxybutane.

8. The method for processing lateritic nickel ore according to claim 1, characterized in that, The activator is Na2S.

9. The method for processing laterite nickel ore according to claim 1, characterized in that, The collector includes at least one of ethyl xanthate, butyl xanthate, isopropyl xanthate, isobutyl xanthate, pentyl xanthate, hexyl xanthate, phenol black, alcohol black, fatty acid, alkyl sulfonate, and kerosene.

10. The method for processing laterite nickel ore according to claim 9, characterized in that, The alcohol blackening agent is an oxane alcohol blackening agent.

11. The method for processing laterite nickel ore according to claim 1, characterized in that, The mass ratio of the raw slag ore, frother, activator, and collector is 1000: (0.018~0.155): (0.045~0.32): (0.048~0.23).

12. The method for processing laterite nickel ore according to claim 1, characterized in that, The smelting in step (3) is carried out in a smelting furnace. During smelting, the oxygen purity in the smelting furnace is 90% to 98%, the oxygen-enriched air volume concentration is 50% to 85%, the fuel excess coefficient is 70% to 95%, the total furnace smelting coefficient is 70% to 100%, and the smelting temperature is 1250℃ to 1620℃.

13. The method for processing lateritic nickel ore according to claim 1, characterized in that, The temperature for the depletion sedimentation separation is 1200℃~1480℃, and the time for depletion separation is 30min~120min.

14. The method for processing lateritic nickel ore according to claim 2, characterized in that, The blowing temperature in both step (7) and step S2 is 1210℃~1350℃.

15. The method for processing lateritic nickel ore according to claim 2, characterized in that, The magnetic field strength for the first magnetic separation is 4100GS to 8200GS.

16. The method for processing lateritic nickel ore according to claim 2, characterized in that, The magnetic field strength for the second magnetic separation is 2100GS to 3500GS.

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