561 results about "Laterite" patented technology

A method for measuring chromium content in a laterite nickel ore, comprising the following steps: S1, adding in sequence nitric acid, phosphoric acid, perchloric acid, and sulfuric acid to a laterite nickel ore sample to be measured, and mixing evenly to obtain a mixed solution A; S2, when the amount of nitric acid is not 0, heating the mixed solution A to remove water and nitric acid, and then raising the temperature to remove perchloric acid, to obtain a mixed solution C; when the amount of nitric acid is 0, heating the mixed solution A directly to remove water and perchloric acid, to obtain a mixed solution C; S3, cooling the mixed solution C, adding water to dilute, boiling again to dissolve salts, cooling, filtering, and diluting for use, and recording as a mixed solution D; and S4, testing the mixed solution D by ICP to calculate the chromium content in the laterite nickel ore. By using nitric acid, phosphoric acid, perchloric acid, and sulfuric acid to perform redox reaction and combining the same with ICP to perform testing, the problems of few process sample testing and analysis methods, long detection time, and complicated procedures in the hydrometallurgy of laterite nickel ore are solved.

The invention discloses a laterite nickel ore leachate extraction tower which comprises an extraction tower body, a heavy phase feeding mechanism, a light phase feeding mechanism, a baffle mechanism and a gas distribution device, the extraction tower body comprises a tower body, a containing cavity is formed in the tower body, and an upper clarifying groove is formed in the top of the tower body; the baffle mechanism comprises at least one movable baffle arranged in the tower body and a lifting driving piece, and through holes are densely distributed in the movable baffles. A heavy phase and a light phase are promoted to be mixed in an air floatation mode, and meanwhile, the lifting driving part drives the movable baffle to move up and down, so that the movable baffle is always located in the light phase in the tower body and located in a preset height range above an interface of the light phase and the heavy phase. When a heavy phase upwards penetrates through each through hole in the movable baffle, the heavy phase is dispersed into small liquid beads, so that the heavy phase is in full contact with a light phase above, the mixing effect is improved, and the extraction efficiency is improved.

Provided are an iron-based sodium battery positive electrode material, and a preparation method therefor and the use thereof. The chemical general formula of the iron-based sodium battery positive electrode material is NaxNiaFebMncMdOe, wherein 0.5≤x≤1.5, 0.15≤a≤0.6, 0.05≤b≤0.5, 0.15≤c≤0.78, 0＜d≤0.4, 1.8≤e≤2.2, and M is derived from laterite-nickel ore and comprises any one or a combination of at least two of Li, B, F, P, Si, Mg, Al, Ca, Ti, V, Cu, Zn, Co, Cr, Rb, Sr, Y, Zr, Nb, Mo, Cd or La. By means of element doping, the structural stability of the iron-based sodium battery positive electrode material can be improved, and the increase of the material capacity is promoted, such that the iron-based sodium battery positive electrode material has a relatively high capacity and good cycling performance; in addition, large-scale mass production can also be achieved.

The invention discloses an all-component comprehensive utilization method for leaching residues of a laterite-nickel ore high-pressure acid leaching process, and belongs to the technical field of solid waste resource utilization. The method comprises the following steps: granulating and sintering the iron-containing slag of the laterite-nickel ore high-pressure acid leaching process and raw materials containing coke powder, a flux and return mine to obtain sintered ore and sulfur dioxide flue gas; sulfur dioxide is used for preparing sulfuric acid and returned to the laterite-nickel ore high-pressure acid leaching procedure; smelting the sintered ore, coke and a slag modifier through a blast furnace to obtain molten iron and slag; the molten slag is subjected to cold quenching, and granulated molten slag is obtained; and after being ground, part of the granulated slag is mixed with the granulated slag and auxiliary materials containing an alkali activator and tailings in the laterite-nickel ore high-pressure acid leaching process to serve as a backfill material. By means of the method, low-consumption, efficient and large-scale all-component comprehensive utilization of the leaching residues of the laterite-nickel ore high-pressure acid leaching process can be achieved, 100% resource utilization of the residues is completed, and the method has considerable industrial popularization potential.

The invention provides an improved treatment method for laterite-nickel ore. The improved treatment method comprises the following steps: S1, carrying out acid leaching on the laterite-nickel ore, and then filtering and washing to obtain a leached solution and first leached residues; step S2, the step S2 is selected from any one of a step S2-1, a step S2-2 and a step S2-3; s3, performing first-stage nickel and cobalt precipitation and dense filtration on the aluminum and scandium removed liquid or the iron and aluminum removed liquid by adopting a precipitator to obtain first-stage nickel and cobalt precipitation liquid and a nickel cobalt hydroxide product; and S4, carrying out second-stage nickel-cobalt precipitation on the first-stage nickel-cobalt precipitation solution by adopting a nickel-cobalt precipitation neutralizer and an oxidizing agent to obtain a magnesium sulfate manganese solution and nickel-cobalt-manganese slurry. In the traditional process, ferrous iron is oxidized by using compressed air, so that energy is wasted. According to the method, the manganese-containing substance is adopted as the oxidizing agent, ferrous iron is oxidized into ferric iron, the problems that the ferrous iron is low in oxidation rate under the low pH and compressed air is wasted are solved, and the scandium recovery rate is increased.

The recovery method of the laterite-nickel ore leaching residues comprises the following steps that S1, in the presence of a first reducing agent, the laterite-nickel ore leaching residues are roasted, and roasted sand and sulfur-containing tail gas are obtained; s2, in the presence of a second reducing agent, smelting the roasted product obtained in the step S1 to obtain molten iron, smelting slag and coal gas; the laterite-nickel ore leaching residues are in a dry state; the smelting slag is a MgO-Al2O3-SiO2-FeO slag system, and the smelting slag is a MgO-Al2O3-SiO2 The ratio of the total mass of fixed carbon in the first reducing agent to the total mass of sulfur in the laterite-nickel ore leaching residues is 0.35-0.50. According to the recycling method, iron and sulfur in the laterite-nickel ore leaching residues can be comprehensively recycled under the condition that extra flux is not needed, resource utilization of the laterite-nickel ore high-pressure leaching residues is achieved under the condition that the overall process cost is low, and large-scale industrial use is facilitated.

The invention provides a wet treatment process for laterite-nickel ore. The wet treatment process comprises the following steps: S1, carrying out acid leaching treatment on the laterite-nickel ore by adopting inorganic acid to obtain leached ore pulp; s2, the leached ore pulp is sequentially subjected to liquid-solid separation and countercurrent washing, and washed pulp and leached residues are obtained; s3, a first oxidizing agent and a first neutralizing agent are added into the washed slurry for iron and aluminum removal treatment, and a solution with iron and aluminum removed and iron and aluminum slag are obtained; s4, carrying out nickel and cobalt precipitation treatment on the solution subjected to iron and aluminum removal, so as to obtain precipitated slurry; s5, continuously carrying out dense separation treatment on the precipitated slurry to obtain underflow and overflow; and S6, the underflow is subjected to washing aftertreatment in sequence, and a cobalt nickel hydroxide product is obtained. The invention provides a short-process wet treatment process for laterite-nickel ore, the production cost and energy consumption are reduced, and meanwhile, the recovery rate of nickel and cobalt, the overall recovery rate of scandium and the quality of nickel-cobalt oxide products are improved.

The invention discloses an iron removal method for laterite-nickel ore leaching pulp, and relates to the technical field of laterite-nickel ore hydrometallurgy. The iron removal method comprises the following steps that the pH value of laterite-nickel ore leaching ore pulp is adjusted to A1, a first mixture is introduced for a first reaction, and first intermediate liquid is obtained; adjusting the pH value of the first intermediate solution to A2, and introducing the second mixture to carry out a second reaction to obtain a second intermediate solution; adjusting the pH value of the second intermediate solution to A3, and carrying out a third reaction to obtain a third intermediate solution; wherein A1 < A2 < A3 < = 6, the first mixture and the second mixture both comprise SO2-containing substances and O2-containing gas, the ferrous content of leached ore pulp can be effectively reduced, and therefore the purity and quality of nickel-cobalt precipitates are improved.

The invention relates to a method for preparing sponge iron from laterite-nickel ore hydrometallurgy tailings, which comprises the following steps: (1) carrying out acid leaching on laterite-nickel ore hydrometallurgy tailings to obtain leached residues without at least part of CaSO4; (2) oxidizing and roasting the leaching residues obtained in the step (1), so that at least part of sulfate is discharged as sulfur-containing gas; performing hydrogen reduction to obtain a reduced material; and (3) the reduction material in the step (2) is sequentially subjected to ore grinding and magnetic separation, and the sponge iron with the Fe content being 90 wt% or above and the S content being 0.01 wt% or below is obtained. According to the method, iron resources in the laterite-nickel ore hydrometallurgy tailings are recycled, desulfurization and reduction are carried out step by step, the desulfurization efficiency is improved, the reduction temperature is reduced, and the sponge iron with the Fe content being 90 wt% or above and the S content being 0.01 wt% or below is obtained.

The application discloses a composite precipitant for wet refining of laterite nickel ore and a wet refining method of laterite nickel ore. The composite precipitant for wet refining of laterite nickel ore is composed of a mixture of magnesium oxide and sodium hydroxide, and the mass fraction of sodium hydroxide in the composite precipitant is greater than 0 and less than or equal to 99%. The wet refining method of laterite nickel ore comprises the following steps: directly or after being grinded, the composite precipitant is added into an acidic solution to be refined, and stirring is performed to make the composite precipitant fully react with the acidic solution to be refined; after concentration, a clear liquid and a solid-containing slurry are obtained; the solid-containing slurry is filtered and washed with water to obtain a solid containing nickel hydroxide, cobalt hydroxide or nickel hydroxide-cobalt hydroxide, so that nickel, cobalt or nickel-cobalt is precipitated. The composite precipitant and the wet refining method of laterite nickel ore have the advantages of simple process, low cost, easy process control, easy settlement and filtration of nickel hydroxide (and cobalt hydroxide) precipitation, and the production efficiency can be significantly improved and the energy consumption can be reduced.

The invention provides a laterite-nickel ore gradient continuous leaching method which comprises the following steps: laterite-nickel ore sequentially passes through a fusion leaching area, a stable leaching area and an adjustable leaching area to be continuously leached in the material conveying direction of the laterite-nickel ore; acid liquor is added into the fusion leaching area and the stability leaching area; the temperature of the fusion leaching area is T1 and the reaction time is t1, the temperature of the stable leaching area is T2 and the reaction time is t2, and the temperature of the adjustable leaching area is T3 and the reaction time is t3; wherein T < 2 > < gt >; t3 > = T1, and t2gt; t3gt; t3gt; t1. According to the method, the high-pressure acid leaching process is subjected to partition treatment, the one-time leaching efficiency is improved, scaling is slowed down, accordingly, scaling of a reaction kettle can be reduced while further leaching of Fe and Al is inhibited, acid liquor and waste residues can be fully utilized, efficient leaching of nickel, cobalt and manganese is achieved, and waste heat generated after slurry is discharged from an adjustable leaching area can be recycled.

The invention belongs to the technical field of slag recycling, and discloses a method for extracting iron ore concentrate from laterite-nickel ore hydrometallurgical slag, which comprises the following steps: heating biomass to 350-600 DEG C in a nitrogen atmosphere for treatment, heating to 350-600 DEG C in a carbon dioxide atmosphere for treatment, cooling, crushing and sieving to obtain biomass charcoal; the laterite-nickel ore hydrometallurgical slag, biomass charcoal and an additive are mixed and then subjected to reduction roasting, and a roasted product is obtained; and adding a dispersing agent into the roasted product, carrying out ball milling, and carrying out size mixing and magnetic separation to obtain iron ore concentrate. The process for extracting the iron ore concentrate from the biomass charcoal is developed for the laterite-nickel ore hydrometallurgical slag, has the advantages of being short in process, low in cost, environmentally friendly, good in recovery effect and the like, and has a positive effect on solving the environmental problems caused by long-term stockpiling, landfill and the like of the laterite-nickel ore hydrometallurgical slag.

The invention discloses a method for recycling laterite-nickel ore metallurgical slag resources, and belongs to the technical field of hydrometallurgy. The method comprises the following steps: carrying out alkaline leaching treatment on the laterite-nickel ore hydrometallurgical slag to obtain alkaline leaching liquid and alkaline leaching slag; carrying out acid leaching treatment on the alkaline leaching residues to obtain acid leaching liquid and acid leaching residues; mixing the acid leaching residues, a biomass reducing agent and an additive, performing primary ball milling treatment, and performing reduction roasting treatment on an obtained product to obtain a roasted product; and mixing the roasted product with a dispersing agent, carrying out secondary ball milling treatment, and carrying out magnetic separation on the obtained product to obtain iron ore concentrate. According to the method, the biomass is carbonized and activated to obtain the biomass reducing agent with enhanced reducibility, the biomass reducing agent is low in cost and environmentally friendly, the biomass reducing agent and the acid leaching residues are continuously mixed according to a specific proportion, reduction roasting is carried out under a specific atmosphere, and then magnetic separation is carried out; and iron ore concentrate with relatively high purity and yield is obtained.

The invention relates to the field of dedusting ash injection, in particular to a laterite-nickel ore dedusting ash injection device and process method.The laterite-nickel ore dedusting ash injection device comprises an injection cylinder and a mixing cylinder, a blanking cylinder is installed between the injection cylinder and the mixing cylinder, the top of the injection cylinder and the top of the mixing cylinder are both connected with feeding pipes, and the top of the mixing cylinder is connected with a raw material pipe; a plurality of blowing vortex mechanisms which are evenly distributed in the circumferential direction are installed on the inner wall of the blowing barrel, a blowing material barrel is installed at the bottom of the blowing barrel, a blowing pipe is connected to the outer side of the blowing material barrel, the blowing pipe is connected with a blowing nozzle, the blowing vortex mechanisms are connected with a blowing air supply assembly, and the blowing air supply assembly is connected with the blowing material barrel and the blowing pipe. A blowing anti-blocking mechanism is mounted in the blowing pipe, a mixing mechanism is mounted in the mixing cylinder, and a vortex auxiliary mechanism is mounted in the blowing cylinder. The blowing vortex mechanism can blow mixed materials, so that the mixed materials rotate in the blowing cylinder, the materials form continuously rotating vortexes, and the materials are prevented from being accumulated in the blowing cylinder.

The invention discloses a method for treating high-pressure leached ore pulp, which comprises the following steps of: performing continuous countercurrent washing treatment (CCD) on the high-pressure leached ore pulp to obtain leached ore pulp overflow; a neutralizing agent and the leaching ore pulp overflow are subjected to pre-neutralization treatment, so that pre-neutralized ore pulp is obtained; and the pre-neutralized ore pulp is subjected to iron and aluminum removal treatment, so that iron and aluminum slag and iron and aluminum removed leaching liquid are obtained. According to the method, the laterite-nickel ore is subjected to high-pressure acid leaching treatment to obtain high-pressure leached ore pulp, the high-pressure leached ore pulp is subjected to CCD (Charge Coupled Device), the laterite-nickel ore leached residues are separated into leached ore pulp underflow, and then the leached ore pulp overflow is subjected to pre-neutralization treatment, so that the separation of the laterite-nickel ore leached residues and the pre-neutralized ore pulp is realized; conditions are created for resource utilization of the laterite-nickel ore leaching residues and tailings obtained by further treatment of pre-neutralized ore pulp obtained after pre-neutralization treatment.

Disclosed in the present invention is a method for recovering Sc from an iron-aluminum slag in a lateritic nickel ore high-pressure acid leaching process, comprising the following steps: S1, leaching a raw material iron-aluminum slag by using sulfuric acid, and carrying out pressure filtration to obtain a leachate; S2, evaporating and concentrating the leachate to obtain a concentrated solution, and adding the raw material iron-aluminum slag and sodium sulfate into the concentrated solution to obtain a mixture; S3, pressurizing and heating the mixture, the pressurization pressure being 4.5-5.0 MPa and the heating temperature being 250-260°C, and then carrying out solid-liquid separation to obtain a slag phase and a liquid phase; and S4, sequentially carrying out extraction, back extraction, scandium salt precipitation, and roasting on the liquid phase to obtain scandium oxide. The recovery rate of scandium is high, and the steps are simple.

The invention provides a combined beneficiation method for laterite-nickel ore, which comprises the following steps: separating chromite in the laterite-nickel ore through a combined process of one-stage cyclone separation, spiral chute, multi-stage table classification, multiple low-intensity magnetic separation and multiple spiral classification to obtain first chromium concentrate, chromium middling, low-intensity magnetic separation middling and mixed light mineral aggregate; the chromium in the limonite and the chromite subjected to leakage treatment in the mixed light mineral aggregate, the low-intensity magnetic separation middling and the high-intensity magnetic separation magnetic substance is further enriched and separated by combining a combined process of subsequent multiple ball milling, two-stage rotational flow, low-intensity magnetic separation and high-intensity magnetic separation, so that more second chromium concentrate is screened out, the content of the chromium in the subsequent high-pressure leaching stock solution is reduced, and the yield of the high-pressure leaching stock solution is improved. The comprehensive utilization of the chromium element is realized.

A treatment method for laterite-nickel ore acid leaching residues, and an active material. The method comprises the following steps: step S1, mixing laterite-nickel ore acid leaching residues, an adjusting material, a fluxing material and a reducing agent, and pressing the mixture, so as to obtain a prefabricate; step S2, roasting the prefabricate to obtain roasting slag and hot flue gas, wherein the hot flue gas is used for preparing an acid; step S3, subjecting the roasting slag to magnetic separation, so as to obtain a refined iron material and tailings; and step S4, mixing the tailings, an active feed and an excitation material, and grinding the mixture, so as to obtain an active material. The treatment method has the characteristics of a large solid waste consumption, multiple types of generated products, a high product output value, a low comprehensive production cost, a high resource utilization rate, etc., and provides a more effective solution way for full recovery of valuable components and full-component recycling of laterite-nickel ore acid leaching residues.

The invention provides a laterite-nickel ore leaching solution catalytic oxidation-fractional precipitation method, and relates to the field of hydrometallurgy, the method comprises the following steps: adding a catalytic oxidant and a first neutralizer into a laterite-nickel ore leaching solution to obtain a first filtrate and iron slag; adding a catalytic oxidant, a second neutralizer and a first coalescing agent into the first filtrate to obtain a second filtrate and a second precipitate; adding a third neutralizer and a first reducing agent into the second filtrate to obtain a nickel-cobalt precipitate and a third filtrate; adding a fourth neutralizer and a second reducing agent into the third filtrate to obtain a fourth precipitate and a fourth filtrate; mixing the second precipitate with a third reducing agent, performing reduction leaching, and adding a second coalescing agent and a fifth neutralizing agent to obtain a silicon-aluminum precipitate and manganese-scandium filtrate; the manganese-scandium filtrate is extracted, and manganese enters raffinate; and adding a catalytic oxidant and a sixth neutralizer into the raffinate to obtain the manganese oxide. Elements are recycled step by step, and the method has the advantages of multiple types of recycled elements, less resource waste and the like.

The invention discloses a laterite-nickel ore washing process and system, and the laterite-nickel ore washing method provided by the invention comprises the following steps: introducing laterite-nickel ore into a cylindrical ore washer by adopting a mechanical ore unloading method for ore washing and pulping, and washing and screening the obtained cylindrical discharge ore pulp by a vibrating screen to obtain the finished ore washing ore pulp. According to the ore washing method, a groove type scrubbing machine which is poor in operation stability in the traditional ore washing process is omitted, meanwhile, the mud-containing gravels on the vibrating screen are intensively washed through the washing effect on the vibrating screen, and the washing effect is ensured.

The invention discloses a high-magnesium medium-low-grade laterite nickel ore roasting device, and relates to the field of laterite nickel ore resource pyrometallurgy processing, the high-magnesium medium-low-grade laterite nickel ore roasting device comprises a feeding device, a rotary kiln, a cooling pond and a conveyor, the rotary kiln comprises a first rotary kiln and a second rotary kiln, the first rotary kiln and the second rotary kiln are both externally connected with a dust removal system, the feeding device is communicated with the feeding end of the first rotary kiln, a conveying device and a flue are installed between the discharging end of the first rotary kiln and the feeding end of the second rotary kiln, a cooling pond is arranged below the discharging end of the second rotary kiln, and the first rotary kiln and the second rotary kiln are arranged in the cooling pond. A conveyor is installed in the cooling pond, the two rotary kilns are respectively provided with a rotary supporting device and a driving device, a first combustor and a second combustor are installed at the discharging end of the first rotary kiln and the discharging end of the second rotary kiln respectively, and a retaining wall is further arranged at the feeding end of the second rotary kiln.

According to the method, blast furnace return ore and limonite type laterite-nickel ore are used for stirring, important parts such as a trough front grid plate and a small ore trough grid plate are densified, hematite and magnetite are used in cooperation in low-alkalinity sintered ore production, and sintering and blast furnace positive coping adjustment operation modes and other modes are adopted, so that the defects of limonite type laterite-nickel ore sintered ore are overcome; on the basis of not influencing the quality and the yield of the sintered ore, the limonite type laterite-nickel ore is applied to the production of the sintered ore, and the monovalent advantage of the laterite-nickel ore and the benefits of the Ni element to part of steel types are fully utilized.

An ore pulp thickening system for laterite-nickel ore, the system comprising an extrusion-type thickening device (1), a speed measurement system (2), and a control system (3), wherein the extrusion-type thickening device (1) comprises an inner barrel (11), an outer barrel (12) and a thickening mechanism (13), the inner barrel (11) is vertically arranged inside the outer barrel (12), has an upper part connected to an ore pulp feeding pipe (111) and a lower part connected to an ore pulp discharging pipe (112), and is provided with a concentration sensor (114), and a filtering surface is formed on a surface thereof; the speed measurement system (2) comprises a first speed measurement device (21) and a second speed measurement device (22) which are respectively arranged on the ore pulp discharging pipe (112) and a water drainage pipe (113); and the control system (3) comprises a first controller (31) and a second controller (32), and the first controller (31) is electrically connected to the speed measurement system (2) and a feeding valve (116). The system enables efficient concentration of ore pulp so as to save on the area occupied by apparatuses and costs.

The invention relates to the technical field of materials and metallurgy, in particular to a method for obtaining ferro-nickel alloy by smelting laterite type nickel ore, which comprises the following steps: carrying out compression molding on a batch of the laterite type nickel ore to obtain pellets, calcining the pellets in a vertical calcining furnace to obtain metallized pellets, and smelting and separating the metallized pellets to obtain ferro-nickel alloy and slag; nodules can be eliminated in the reduction roasting stage, meanwhile, the use amount of air can be reduced, the exhaust gas emission temperature is lowered, and therefore the heat efficiency is improved. The slag is ground and separated into slag particles and slag powder, the slag particles are rich in metal elements, the slag particles are extracted to serve as return mine and participate in batching again, the metal recovery rate is increased, and the slag powder can be used as superfine slag powder. Besides, if the slag is subjected to remelting and component adjustment, cement or steel slag phosphate fertilizer can be obtained in the ferronickel production process and is used for replacing the superfine slag powder, and resource waste is further avoided.

The invention discloses a method for increasing the content of iron oxide in red mud. Compared with the prior art, the method has the following beneficial effects: the problems of high ore consumption caused by insufficient recovery of AL2O3 dissolved out from the laterite type high-iron low-silicon guineite at low temperature, influence on system efficiency, energy consumption and product quality due to harsh desilicication conditions, incapability of realizing full-quantitative utilization of red mud and low comprehensive utilization degree of resources are solved; comprising the following steps: preparing materials: obtaining red mud ore pulp, diluting and separating the red mud ore pulp, adding an auxiliary agent into diluted and separated underflow, and adding mother liquor for secondary adjustment to obtain red mud slurry; dissolving out at high temperature; heating the red mud slurry to a preset temperature T1, and maintaining for 1-2 hours at the preset temperature T1; filtering the slurry; and diluting and separating the slurry subjected to high-temperature dissolution treatment.

The present invention belongs to the technical field of metallurgy. Disclosed is a reaction kettle for the neutralization and impurity removal of a laterite nickel ore. The reaction kettle comprises a kettle body, a feeding device, a detection device and a stirring device, wherein a plurality of reaction layers are formed inside the kettle body in a height direction of the kettle body; the feeding device comprises a plurality of output portions, wherein outlets of the plurality of output portions are respectively in communication with the plurality of reaction layers, and an inlet of each output portion is in communication with both a slurry conveying unit for conveying slurry and a neutralizer conveying unit for conveying a neutralizer, and a first valve and a second valve are provided between pipelines which are in communication with the slurry conveying unit and the neutralizer conveying unit; and the detection device is provided with a plurality of detection members, each reaction layer being internally provided with at least one detection member. The present invention provides layered control and adjustment of the pH value of the slurry in the kettle body, such that the pH value of the slurry at each position in the kettle body is kept within a proper range, thus avoiding large differences in pH values and local over-alkalinity.

The invention provides an impurity and oil removal method for a laterite-nickel ore hydrometallurgy filter stick. The impurity and oil removal method comprises the following steps: dynamically cleaning a to-be-treated filter stick by adopting a first cleaning solution so as to remove oil stains on the surface of the filter stick; the first cleaning solution comprises an alkaline reagent and a surfactant; dynamically cleaning the oil-removed filter stick by adopting a second cleaning solution so as to remove metal impurities on the surface of the filter stick; the second cleaning solution comprises an acidic reagent and fluoride. According to the method, a step-by-step strategy of oil removal and impurity removal is adopted, the alkaline reagent and the surfactant cooperate with each other, oil stains on the surface of the filter stick can be efficiently stripped, and a channel is opened for subsequent impurity removal; the acidic reagent and the fluoride cooperate with each other, nickel, cobalt, lead and other impurities on the surface of the filter stick can be efficiently removed, fluorine ions and the metal ions can form a water-soluble complex, the problem of impurity metal residues is thoroughly solved, and deep regeneration of the filter stick is achieved. The strategy is excellent in oil and impurity removal effect and regeneration performance.

The invention discloses a method for preparing a high-pressure leachate and a method for preparing nickel cobalt hydroxide, and the method comprises the following steps: carrying out high-pressure acid leaching treatment on reduced laterite-nickel ore pulp to obtain the high-pressure leachate, mixing the reduced laterite-nickel ore pulp with an oxidizing agent before the high-pressure acid leaching treatment, and / or adding the high-pressure leachate to the reducing laterite-nickel ore pulp to obtain the high-pressure leachate, the oxidizing agent is added in the high-pressure acid leaching treatment process. The method is simple in production process, and the smelting cost of the reduced laterite-nickel ore is reduced.

The invention provides a method for preparing high-purity silicon dioxide from laterite-nickel ore acid leaching residues. The method comprises the following steps: (1) dissolving the acid leaching residues and a soluble alkali solution for reaction to obtain a sodium silicate solution; (2) introducing CO2 gas into the sodium silicate solution, and carrying out secondary carbonization separation to obtain crude SiO2 precipitate; and (3) carrying out H2SO4 acid pickling, water washing and solid-liquid separation on the crude SiO2 precipitate, and drying and roasting the separated solid phase to obtain the high-purity silicon dioxide. The method for preparing the high-purity silicon dioxide from the laterite-nickel ore acid leaching residues is simple in technological process, low in raw material price, low in synthesis cost, simple and feasible in synthesis process in industry and low in energy consumption.

The invention relates to an iron resource recovery method for laterite-nickel ore leaching residues, which comprises the following steps: sequentially carrying out first acid leaching, alkaline leaching, second acid leaching, ore grinding and magnetic separation on the laterite-nickel ore leaching residues to obtain iron ore concentrate with the total iron grade of 60-65wt%; a first leaching agent in the first acid leaching is hydrochloric acid; a second leaching agent in the second acid leaching is hydrochloric acid. According to the iron resource recycling method, the problems of high energy consumption and pollution caused by reduction roasting can be solved, the obtained iron ore concentrate can reach the selling standard, the magnetic separation tailings can be used for producing building materials, cement and other additional products, and effective recycling of iron resources is achieved.