Resource utilization method for iron-aluminum slag and nickel laterite ore acid leaching residue

Abstract

Disclosed is a resource utilization method for iron-aluminum slag and nickel laterite ore acid leaching residue, belonging to the technical field of resource recovery and reuse. In the method, ternary solid waste iron-aluminum slag is processed using a suspension roasting pre-reduction pyrogenic method; after initial drying, and by means of a suspension roasting pre-reduction furnace, the iron-aluminum slag is further dried to remove water of crystallization and is pre-reduced, and valuable metals such as Ni and Co are enriched. The method has high pre-reduction efficiency and low production costs, is environmentally friendly, and the entire process is highly operable and produces little ferronickel slag. The ferronickel and nickel pig iron prepared and obtained via the present method have high nickel and iron content, and the ferronickel and nickel pig iron of the present invention have a high Ni, Co, and Fe direct recovery rate.

Description

A method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue Technical Field

[0001] This article relates to the technical field of resource recovery and reuse, and specifically to a method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue. Background Art

[0002] With the continuous rise in the price of battery raw materials and the large amount of waste batteries produced, the recycling value of waste ternary lithium batteries continues to increase. In the process of recycling and extracting valuable metals such as nickel, cobalt, and lithium from ternary waste batteries, a large amount of iron-aluminum slag will be produced. The later stage of ternary waste battery recycling process mainly produces sodium-based iron-aluminum slag. The iron-aluminum slag has a large amount of slag and carries the most metals, mainly nickel, cobalt, manganese, iron, and aluminum, all of which are valuable metal elements. Nickel, cobalt, and manganese mainly exist in the form of hydroxides, while iron and aluminum exist in the form of sodium iron alum NaFe3(SO4)2(OH)6 and sodium alum stone NaAl3(SO4)(OH)6. They have high recycling value and this process cannot be replaced at present.

[0003] While some research is underway on the resource utilization and high-value development of ternary ferro-aluminum slag, it's limited to aluminum extraction and lacks industrial application. With increasingly stringent environmental regulations, ternary ferro-aluminum slag is essentially treated as a general solid waste. Containing large amounts of valuable metals, ternary ferro-aluminum slag lacks its intended value. Therefore, there's an urgent need to develop technologies for the resource utilization of ternary ferro-aluminum slag, transforming waste into valuable resources.

[0004] The composition of ternary ferro-aluminum slag primarily includes iron, aluminum, nickel, cobalt, manganese, copper, sulfur, sodium, phosphorus, and fluorine. While theoretically all of these elements can be recycled as battery materials, iron, aluminum, nickel, cobalt, copper, sulfur, and sodium have limited recycling value based on their value and content. Based on the smelting processes of these metals, a combined hydrometallurgical and pyrometallurgical smelting process is proposed to extract these valuable metals. Research is underway to develop a ternary ferro-aluminum slag resource utilization process: "ternary ferro-aluminum slag → drying → crushing → suspension roasting pre-reduction → roasting → electric furnace smelting → ferro-nickel production of ferrophosphate, ferro-nickel slag + laterite nickel ore acid leaching residue → electric arc furnace smelting → sale of nickel pig iron for steelmaking / sale of electric furnace slag."

[0005] CN105506290A discloses a method for the comprehensive utilization of iron-aluminum slag. The process selectively leaches the iron-aluminum slag to dissolve nickel, cobalt, and aluminum in the slag; then, sodium sulfide is added to the nickel, cobalt, and aluminum leaching solution to precipitate and recover the nickel and cobalt in the solution to obtain a crude aluminum sulfate solution; an oxidant and sodium hydroxide are added to the crude aluminum sulfate solution to remove iron, and then sodium sulfate salt is added to prepare the solution into a stock solution for producing sodium aluminum sulfate; the stock solution is evaporated and crystallized to obtain a sodium aluminum sulfate product. This process adopts a full wet process to treat ferroaluminum slag. The ferroaluminum slag is first selectively leached to remove nickel, cobalt and aluminum, and then sodium sulfide is added for precipitation to recover nickel and cobalt. Then, an oxidant and sodium hydroxide are introduced to remove iron, and sodium sulfate is added to obtain sodium aluminum sulfate product. The process flow is long and the cost is high. The wet slag produced at the end is still solid waste or even hazardous waste. The full fire process of the present invention treats ferroaluminum slag. The process is completely different. The ferroaluminum slag is first dried and suspended for pre-reduction by roasting, and then nickel, cobalt, iron and copper are directly extracted by fire reduction smelting to obtain nickel iron and nickel pig iron products. The nickel iron products enter the iron phosphate production line to prepare iron phosphate. The process is novel, the recovery rate of valuable metals is high, and the economic benefits are better.

[0006] CN114317991A discloses a method for recovering valuable metals by carbon-free smelting of hazardous iron and aluminum waste slag and wet desulfurization slag. The invention comprises the following steps: (1) carbon-free reduction roasting in a rotary kiln: the mass percentage of hazardous iron and aluminum waste slag, wet desulfurization slag, and hematite or magnetite in the rotary kiln is 100:1-6:1-4; (2) electric furnace reduction smelting: the roasted sand is evenly added into the electric furnace for reduction; (3) aluminum-containing slag is quickly cooled and ground: the slag is cooled at a cooling rate of 1200-1300°C / min, and the grinding particle size is 450-480 mesh. The method for recovering valuable metals by carbon-free smelting of hazardous iron and aluminum waste slag and wet desulfurization slag adopted in the invention has easy process control, simple operation, and strong process adaptability. It can achieve a recovery rate of nickel, cobalt, and copper in the hazardous iron and aluminum slag of more than 98%, and can realize the preparation of slag micropowder from the reduced slag, thereby achieving the purpose of resource utilization of hazardous waste and having good social and economic benefits. However, the process of the invention cannot process low-grade ferroaluminum slag, and the product quality is poor and the impurities are high. The process of the present invention adopts suspended pre-reduction roasting and adopts reducing gas as the reducing agent, while the reducing agent for high-temperature reduction smelting in electric furnaces and electric arc furnaces is graphite slag, graphite tailings, blue carbon or anthracite. In addition to limestone and quartz sand, the flux of the electric arc furnace also includes nickel iron slag, and can process low-grade ferroaluminum slag, and the output product quality is better.

[0007] CN113789447A discloses a method for recovering nickel from iron-aluminum slag obtained by leaching battery powder. The invention discloses a method for recovering nickel from iron-aluminum slag obtained by leaching battery powder. The method comprises the following steps: first, adding sulfuric acid solution to the iron-aluminum slag to dissolve the nickel to obtain a sulfate solution, then adding an oxidant, adding ammonia and carbonate to the oxidized sulfate solution, adjusting the pH to 1.0-3.2 for reaction, separating the ferric hydroxide precipitate to obtain a de-ironized liquid, adding carbonate to the de-ironized liquid, adjusting the pH to 3.2-5.5 for reaction, separating the aluminum hydroxide precipitate to obtain a de-aluminized liquid, adding ammonia to the de-aluminized liquid, adjusting the pH to 7.0-8.8 for reaction, washing and removing impurities to obtain a nickel complex, adding an oxidant to the nickel complex to break the complex, and obtaining a nickel-containing solution. The method well realizes the efficient separation of iron, aluminum, and nickel in the iron-aluminum slag, improves the separation effect of iron, aluminum, and nickel, reduces the loss of nickel, and improves the recovery rate of nickel. However, the generated wet slag is still solid waste or hazardous waste and cannot be effectively treated. The present invention effectively extracts valuable metals such as nickel, cobalt, iron, aluminum and copper from ferroaluminum slag through a full pyrometallurgical process, and solidifies and sells hazardous solid wastes such as graphite slag, ferronickel slag and laterite nickel ore acid leaching residue after pyrometallurgical smelting.

[0008] In view of this, this article is proposed.

[0009] Summary of the Invention

[0010] The purpose of this paper is to overcome the shortcomings of the existing technology and provide a method for resource utilization of ferroaluminum slag and laterite nickel ore acid leaching residue. This paper adopts a suspended roasting pre-reduction fire method to treat ternary solid waste ferroaluminum slag. The ferroaluminum slag is first dried and then further dried to remove crystal water and pre-reduced in a suspended roasting pre-reduction furnace to enrich valuable metals such as Ni and Co. The pre-reduction efficiency is high, the production cost is low, it is environmentally friendly, the entire process is highly operational, and the amount of nickel-iron slag is small. The nickel and iron content of the nickel and nickel pig iron prepared in this paper is high, and the nickel, Co, and Fe direct yields of the nickel and nickel pig iron in this paper are high.

[0011] To achieve the above objectives, the technical solutions adopted in this paper are:

[0012] A method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue, comprising the following steps:

[0013] Drying the iron-aluminum slag, mixing the iron-aluminum slag with flux 1, and then grinding the slag to obtain a mixture;

[0014] The mixed material and flux 2 are calcined and pre-reduced in a reducing atmosphere to obtain calcine;

[0015] Smelting calcined sand, flux 3, and reducing agent 1 to obtain ferronickel and ferronickel slag;

[0016] The nickel pig iron and the electric furnace slag are obtained by smelting the nickel ferronickel slag, the laterite nickel ore acid leaching residue, the flux 4 and the reducing agent 2.

[0017] In one embodiment, the main components of the ferroaluminum slag are: 0.40-1.00 wt% Ni, 0.10-0.40 wt% Co, 10.00-30.00 wt% Fe, 1.00-8.00 wt% S, 0.50-1.00 wt% Al, and 0.50-1.50 wt% Na.

[0018] In one embodiment, the ferroaluminum slag is dried to a moisture content of ≤10 wt %.

[0019] In one embodiment, drying is specifically as follows: the ferroaluminum slag is loaded into the kiln top hopper for standby use. When feeding, the ferroaluminum slag enters the dehydrator from the hopper for dehydration, and after dehydration, it is put into the rotary drum dryer through the conveying auger; a gas generator is used to provide heat to the drying kiln to dry and remove free water and part of the adsorbed water; during the drying process, the moisture on the surface of the ferroaluminum slag diffuses from the surface to the surrounding medium in the form of water vapor. When the surface moisture evaporates, a humidity gradient is formed inside and on the surface of the ferroaluminum slag, so that the moisture inside the ferroaluminum slag migrates along the gap to the surface for evaporation and removal; after drying, the ferroaluminum slag is discharged through a cyclone discharger and a discharging auger and stored in a storage bin. Among them, the water content of the iron-aluminum slag is 30-60wt%; the capacity of the kiln top silo is 5-10t; the water content of the material after dehydration by the dehydrator is 25-50%; the feeding rate of the conveying auger is 10-20t / h; the fuel of the gas generator is one of coal gas, natural gas and hydrogen; the furnace temperature of the rotary drum dryer is 100-800℃; the diameter and length of the rotary drum dryer are 2m and 20m respectively; the feed rate of the rotary drum dryer is 5-20t / h; the discharging auger discharging rate is 1-20t / h; the water content of the iron-aluminum slag after drying is ≤10wt%, and the particle size is 2-10mm.

[0020] In one embodiment, the grinding process is performed to a particle size of less than 2 mm.

[0021] In one embodiment, the mass ratio of the iron-aluminum slag to the flux 1 is 1:(0.01-0.05).

[0022] In one embodiment, the mass ratio of the mixed material to the flux 2 is 1:(0.01-0.08).

[0023] In one embodiment, the temperature of the calcination pre-reduction is 700-1080° C., and the time is 10-50 minutes.

[0024] In one embodiment, the mixed material and flux 2 are roasted and pre-reduced in a reducing atmosphere. Specifically, the mixed material is put into a suspension roasting and pre-reduction furnace for roasting and pre-reduction, flux 2 is added to adjust the slag shape, and 100-1000Nm 3 / h fuel combustion heat supply, 50~300Nm3 / h of reducing gas is used to pre-reduce the ferroaluminum slag. The reduction roasting temperature is 700-1080°C and the roasting time is 10-50 minutes. The produced calcine is directly put into the electric furnace for reduction smelting or transferred to a calcine silo for storage. The fuel is one of pulverized coal, natural gas, heavy oil, or coal gas; the reducing gas is carbon monoxide or hydrogen.

[0025] In one embodiment, the main components of the calcined sand are: 1.50-3.60 wt% Ni, 0.35-0.68 wt% Co, 30.00-50.00 wt% Fe, 0.50-2.10 wt% Mn, 1.00-3.00 wt% Al, and 1.00-2.00 wt% Na.

[0026] In one embodiment, the mass ratio of the calcined sand, flux 3, and reducing agent 1 is 1:(0.01-0.05):(0.03-0.1).

[0027] In one embodiment, when the calcined sand, flux 3 and reducing agent 1 are smelted, the smelting temperature is 1400-1550° C. and the smelting time is 15-60 minutes.

[0028] In one embodiment, the roasted sand, flux 3, and reducing agent 1 are melted as follows: roasted sand is put into a 3000KVA electric furnace, and flux 3 and reducing agent 1 are added. The heat required for reduction smelting is generated by the arc generated by the contact between the electrode and the slag and the current passing through the roasted sand and slag. That is, the heat is generated inside the charge, so the roasted sand is melted by heat and the chemical reaction is carried out inside the roasted sand. Therefore, the smelting in the electric furnace is a simultaneous reduction reaction and slag formation. The slag near the electrode has a lower density due to the increase in temperature and the presence of gas generated by the reaction in the slag. It floats up along the electrode and diffuses horizontally around it after reaching the surface. The lower temperature charge absorbs the heat of the superheated slag and melts. The melted calcine and the cooled slag mix together and sink due to the increase in density. When it falls to the depth of the electrode insertion, part of it moves horizontally toward the electrode and becomes part of the continuous cycle, while the rest continues to settle to the end of the pile and moves horizontally along the molten surface below the calcine. In this way, most of the melt falls down into the relatively calm slag layer below, and the slag and nickel iron are separated. The reaction temperature is 1400-1550℃, and the high temperature smelting time is 15-60min. The reaction produces nickel iron, nickel iron slag and flue gas. The electric furnace slag is compounded with the laterite nickel ore acid leaching residue to prepare nickel pig iron. The flue gas is used to dry the iron and aluminum slag raw materials after desulfurization and denitrification to meet the standards. The nickel iron enters the acid leaching process to prepare iron phosphate.

[0029] In one embodiment, the main components of the nickel iron are: 10.00-35.00 wt% Ni, 2.50-5.00 wt% Co, 60.00-80.00 wt% Fe, 0.10-0.60 wt% S, 1.50-3.00 wt% C; and / or

[0030] The main components of the nickel-iron slag are: 0.01-0.25wt% Ni, 0.001-0.01wt% Co, 10.00-30.00wt% Fe, 5.00-20.00wt% Si, 2.00-8.00wt% Ca, 2.00-10.00wt% Al, 0.50-2.50wt% Mn, 0.10-0.60wt% Mg, and 0.01-0.13wt% Cr.

[0031] In one embodiment, the main components of the laterite nickel ore acid leaching residue are: 0.05-0.75wt% Ni, 0.0001-0.001wt% Co, 40.00-57.00wt% Fe, 4.00-12.00wt% Si, 0.10-1.00wt% Ca, 1.00-5.00wt% Al, 0.10-0.60wt% Mn, 0.10-1.00wt% Mg, and 0.50-1.20wt% Cr.

[0032] In one embodiment, the mass ratio of the nickel iron slag, the laterite nickel ore acid leaching residue, the flux 4, and the reducing agent 2 is 1: (1-3): (0.01-0.03): (0.04-0.11).

[0033] In one embodiment, when ferronickel slag, laterite nickel ore acid leaching residue, flux 4, and reducing agent 2 are smelted, the smelting temperature is 1450-1600° C. and the smelting time is 20-60 minutes.

[0034] In one embodiment, ferronickel slag, laterite nickel ore acid leaching residue, flux 4, and reducing agent 2 are smelted specifically as follows: electric furnace slag and laterite nickel ore acid leaching residue are compounded in an electric arc furnace for smelting: ferronickel slag is used as an iron-enhancing agent or flux, and is mixed with laterite nickel ore acid leaching residue in a ratio of (1:1-3), and flux 4 and reducing agent 2 are added; electric energy is used as the main energy source, and electric energy is discharged and arced with the charge through graphite electrodes to generate a high temperature of up to 2000°C to 6000°C, and the electric furnace slag and acid leaching residue raw materials are melted by arc radiation, temperature convection, and heat conduction; in addition, electric heating can easily and accurately control the furnace temperature to 1450°C to 1600°C, and the heating operation is carried out in a reducing atmosphere and normal pressure according to the process requirements, and the reaction time is controlled to 20min to 60min, and nickel pig iron, electric furnace slag, and flue gas are directly reacted to produce. Nickel pig iron is sold directly for steelmaking, electric furnace slag is sold for the preparation of cement, roadbed materials, etc., and the flue gas is used to dry iron and aluminum slag raw materials after being treated by the denitrification and desulfurization system.

[0035] In one embodiment, the nickel pig iron mainly comprises: 1.00-3.00wt% Ni, 0.01-0.05wt% Co, 80.00-96.00wt% Fe, 0.10-0.80wt% S, 1.00-3.00wt% C, 1.00-3.50wt% Cr, 0.05-0.25wt% Mn, 0.10-0.32wt% P; and / or

[0036] The main components of the electric furnace slag are: 0.01-0.03wt% Ni, 0.0001-0.001wt% Co, 5.00-30.00wt% Fe, 5.00-20.00wt% Si, 10.00-25.00wt% Ca, 3.00-10.00wt% Al, 0.10-1.50wt% Mn, 1.00-5.00wt% Mg, and 0.05-1.00wt% Cr.

[0037] In one embodiment, the flux 1, flux 2, flux 3, and flux 4 are each independently selected from at least one of limestone, quartz sand, bauxite, and iron block; and / or

[0038] The reducing agent 1 and the reducing agent 2 are each independently selected from at least one of graphite slag, anthracite, and graphite anode butts.

[0039] The beneficial effects of this paper are as follows: (1) This paper adopts the suspended roasting pre-reduction fire method to treat the ternary solid waste iron-aluminum slag. After the iron-aluminum slag is dried, it is further dried and dehydrated by the suspended roasting pre-reduction furnace, and pre-reduced to enrich valuable metals such as Ni and Co. Since the reducing agent is gas, the gas-solid reaction is relatively fast and sufficient, so the pre-reduction efficiency is high, the production cost is low, the environment is very friendly, and the whole process is highly operable. The roasted sand is reduced and smelted in an electric furnace to produce nickel iron, with a high direct yield of the product, less flue gas, simple process, and less nickel iron slag. (2) This paper uses solid waste residues such as ternary iron-aluminum slag, nickel iron slag and laterite nickel ore acid leaching residue as raw materials, nickel iron slag and waste quartz sand as flux, and graphite slag solid waste produced in the battery recycling process as reducing agent, turning waste into treasure, with good economic efficiency and green environmental protection. The flue gas is used to dry the iron-aluminum slag raw materials, saving energy consumption. The electric furnace slag can be sold for use as building materials, solving the problem of open circuit of waste residue. (3) The wet leaching slag produced by the existing wet process of iron-aluminum slag contains a large amount of heavy metal ions such as nickel, manganese, and copper, which are harmful to human health and damage the ecological environment. This process can solidify heavy metals at high temperature, so that the toxicity and corrosiveness of electric furnace slag meet the national standards; (4) The nickel and iron content of the nickel iron and nickel pig iron prepared in this paper are high, and the direct recovery rate of Ni, Co, and Fe of the nickel iron and nickel pig iron in this paper is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] FIG1 is a flow chart of the resource utilization method of ferroaluminum slag and laterite nickel ore acid leaching residue in this article. DETAILED DESCRIPTION

[0041] To make the objectives, technical solutions, and advantages of the embodiments herein more clear, the technical solutions in the embodiments herein are described clearly and completely below. Obviously, the described embodiments are only a portion of the embodiments herein, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments herein without inventive effort are also within the scope of protection herein.

[0042] Unless otherwise specified, the experimental reagents and instruments involved in the implementation of this article are commonly used reagents and instruments.

[0043] In this article, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0044] As used herein, when referring to numerical ranges, unless otherwise specified, the numerical ranges are considered continuous and include the minimum and maximum values ​​of the range, as well as every value between such minimum and maximum values. Furthermore, when a range refers to an integer, every integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges subsumed therein.

[0045] Example 1

[0046] Referring to FIG1 , this embodiment provides a method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue, comprising the following steps:

[0047] (1) Drying of iron-aluminum slag: 1 ton of iron-aluminum slag is loaded into the kiln top hopper for standby use. When feeding, the iron-aluminum slag enters the dehydrator from the hopper for dehydration and is then fed into the rotary drum dryer through the conveying auger. A gas generator is used to provide heat to the drying kiln to dry and remove free water and some adsorbed water.

[0048] Among them, the water content of the ferroaluminum slag is 30wt%; the capacity of the kiln top hopper is 5t; the water content of the material after dehydration by the dehydrator is 25%; the feeding rate of the conveying auger is 10t / h; the fuel of the gas generator is natural gas; the furnace temperature of the rotary drum dryer is 100°C; the diameter and length of the rotary drum dryer are 2m and 20m respectively; the feeding rate of the rotary drum dryer is 5t / h; the discharging auger discharging rate is 10t / h; the water content of the ferroaluminum slag after drying is 10wt%, and the particle size is 2mm; the main components of the ferroaluminum slag are Ni 0.40wt%, Co 0.10wt%, Fe 10.00wt%, S 1.00wt%, Al 0.50wt%, and Na 0.50wt%.

[0049] (2) Grinding ingredients: The dried iron-aluminum slag and the solvent are mixed in a ratio of 1:0.01 and ground. The particle size of the mixture after grinding is less than 2 mm.

[0050] Among them, solvent 1 is limestone.

[0051] (3) Suspension roasting pre-reduction: 1 t of mixed material is put into the suspension roasting pre-reduction furnace for roasting pre-reduction, and flux 2 (with a mass ratio of 0.01:1 to the mixed material) is added to adjust the slag shape, and 100 Nm 3 / h combustion heat supply, 50Nm 3 / h reducing gas is used to pre-reduce the iron-aluminum slag, the reduction roasting temperature is 700℃, and the roasting time is 10min to obtain roasted sand.

[0052] The flux 2 is limestone; the fuel is pulverized coal; the reducing gas is carbon monoxide; and the main components of the roasted sand are Ni 1.50wt%, Co 0.35wt%, Fe 50.00wt%, Mn 2.10wt%, Al 3.00wt%, and Na 2.00wt%.

[0053] (4) Electric furnace smelting of roasted sand: 1 t of roasted sand is put into a 3000 KVA electric furnace, 1% flux 3 and 3% reducing agent 1 are added, the reaction temperature is 1400°C, and the high-temperature smelting time is 15 minutes. The reaction generates nickel iron, electric furnace slag and flue gas;

[0054] Among them, the flue gas is used to dry iron and aluminum slag raw materials after desulfurization and denitrification meet the standards, and nickel iron can enter the acid leaching process to prepare iron phosphate.

[0055] Wherein, the main components of the nickel iron are: Ni 10.00wt%, Co 2.50wt%, Fe 80.00wt%, S 0.60wt%, and C 3.00wt%; the main components of the nickel iron slag are: Ni 0.25wt%, Co 0.01wt%, Fe 10.00wt%, Si 10.00wt%, Ca 8.00wt%, Al 10.00wt%, Mn 2.50wt%, Mg 0.60wt%, and Cr 0.13wt%; the flux 3 is limestone and quartz sand (mass ratio is 1:1); and the reducing agent 1 is graphite slag.

[0056] (5) Electric arc furnace smelting of electric furnace slag and laterite nickel ore acid leaching residue: Electric furnace slag and laterite nickel ore acid leaching residue are mixed in a ratio of (1:1), and 1% flux 4 and 4% reducing agent 2 are added; the reaction is carried out at a furnace temperature of 1450°C, a reducing atmosphere, and normal pressure for 60 minutes to obtain nickel pig iron, electric furnace slag and flue gas.

[0057] The flux 4 is limestone; the reducing agent 2 is graphite slag.

[0058] The main components of the laterite nickel ore acid leaching residue are: Ni 0.05wt%, Co 0.0001wt%, Fe 57.00wt%, Si 12.00wt%, Ca 0.10wt%, Al 1.00wt%, Mn 0.10wt%, Mg 0.10wt%, and Cr 0.50wt%.

[0059] The nickel pig iron mainly comprises: Ni 1.00wt%, Co 0.01wt%, Fe 96.00wt%, S 0.10wt%, C 1.00wt%, Cr 1.00wt%, Mn 0.05wt%, P 0.10wt%;

[0060] The electric furnace slag mainly comprises: Ni 0.01wt%, Co 0.0001wt%, Fe 5.00wt%, Si 5.00wt%, Ca 10.00wt%, Al 10.00wt%, Mn 1.50wt%, Mg 5.00wt%, and Cr 1.00wt%.

[0061] Example 2

[0062] Referring to FIG1 , this embodiment provides a method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue, comprising the following steps:

[0063] (1) Drying of iron-aluminum slag: 5 tons of iron-aluminum slag is loaded into the kiln top hopper for standby use. When feeding, the iron-aluminum slag enters the dehydrator from the hopper for dehydration and is then fed into the rotary drum dryer through the conveying auger. A gas generator is used to provide heat to the drying kiln to dry and remove free water and some adsorbed water.

[0064] Among them, the water content of the ferroaluminum slag is 60wt%; the capacity of the kiln top silo is 5t; the water content of the material after dehydration by the dehydrator is 50%; the feeding rate of the conveying auger is 20t / h; the fuel of the gas generator is natural gas; the furnace temperature of the rotary drum dryer is 800℃; the diameter and length of the rotary drum dryer are 2m and 20m respectively; the feeding rate of the rotary drum dryer is 5t / h; the discharging auger discharging rate is 10t / h; the water content of the ferroaluminum slag after drying is 9wt%, and the particle size is 10mm; the main components of the ferroaluminum slag are Ni 1.00wt%, Co 0.40wt%, Fe 10.00wt%, S 8.00wt%, Al 1.00wt%, and Na 1.50wt%.

[0065] (2) Grinding ingredients: The dried iron-aluminum slag and the solvent are mixed in a ratio of 1:0.05 and ground. The particle size of the mixture after grinding is less than 2 mm.

[0066] Wherein, solvent 1 is quartz sand.

[0067] (3) Suspension roasting pre-reduction: 5t of mixed material was put into the suspension roasting pre-reduction furnace for roasting pre-reduction, and flux 2 (with a mass ratio of 0.08:1 to the mixed material) was added to adjust the slag shape, and 100Nm 3 / h combustion heat supply, 300Nm 3 / h reducing gas was used to pre-reduce the iron-aluminum slag, the reduction roasting temperature was 1080℃, and the roasting time was 50min to obtain roasted sand.

[0068] The flux 2 is lime sand; the fuel is natural gas; the reducing gas is carbon monoxide; and the main components of the roasted sand are Ni 3.60wt%, Co 0.68wt%, Fe 30.00wt%, Mn 0.50wt%, Al 1.00wt%, and Na 1.00wt%.

[0069] (4) Baked sand electric furnace smelting: 5 tons of baked sand was put into a 3000KVA electric furnace, 5% flux 3 and 10% reducing agent 1 were added, the reaction temperature was 1550°C, and the high temperature smelting time was 60 minutes. The reaction produced nickel iron, electric furnace slag and flue gas;

[0070] Among them, the flue gas is used to dry iron and aluminum slag raw materials after desulfurization and denitrification meet the standards, and nickel iron can enter the acid leaching process to prepare iron phosphate.

[0071] Wherein, the main components of the nickel iron are: Ni 35.00wt%, Co 5.00wt%, Fe 60.00wt%, S 0.10wt%, C 1.50wt%;

[0072] The main components of the nickel-iron slag are: Ni 0.01wt%, Co 0.001wt%, Fe 30.00wt%, Si 20.00wt%, Ca 2.00wt%, Al 2.00wt%, Mn 0.50wt%, Mg 0.10wt%, and Cr 0.01wt%; the flux 3 is quartz sand and iron block (mass ratio 1:1); and the reducing agent 1 is anthracite.

[0073] (5) Electric arc furnace smelting of electric furnace slag and laterite nickel ore acid leaching residue: Electric furnace slag and laterite nickel ore acid leaching residue are mixed in a ratio of (1:3), and 3% flux 4 and 11% reducing agent 2 are added; the reaction is carried out at a furnace temperature of 1600°C, a reducing atmosphere, and normal pressure for 20 minutes to obtain nickel pig iron, electric furnace slag and flue gas.

[0074] The flux 4 is quartz sand; the reducing agent 5 is anthracite.

[0075] The main components of the laterite nickel ore acid leaching residue are: Ni 0.75wt%, Co 0.001wt%, Fe 40.00wt%, Si 12.00wt%, Ca 1.00wt%, Al 5.00wt%, Mn 0.60wt%, Mg 1.00wt%, and Cr 1.20wt%.

[0076] The nickel pig iron mainly comprises: Ni 3.00wt%, Co 0.05wt%, Fe 80.00wt%, S 0.80wt%, C 3.00wt%, Cr 3.50wt%, Mn 0.25wt%, P 0.32wt%;

[0077] The electric furnace slag mainly comprises: Ni 0.03wt%, Co 0.001wt%, Fe 30.00wt%, Si 20.00wt%, Ca 25.00wt%, Al 10.00wt%, Mn 0.10wt%, Mg 1.00wt%, and Cr 0.05wt%.

[0078] Example 3

[0079] Referring to FIG1 , this embodiment provides a method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue, comprising the following steps:

[0080] (1) Drying of iron-aluminum slag: 3 tons of iron-aluminum slag is loaded into the kiln top hopper for standby use. When feeding, the iron-aluminum slag enters the dehydrator from the hopper for dehydration and is then fed into the rotary drum dryer through the conveying auger. A gas generator is used to provide heat to the drying kiln to dry and remove free water and some adsorbed water.

[0081] Among them, the water content of the ferroaluminum slag is 40wt%; the capacity of the kiln top silo is 8t; the water content of the material after dehydration by the dehydrator is 35%; the feeding rate of the conveying auger is 15t / h; the fuel of the gas generator is natural gas; the furnace temperature of the rotary drum dryer is 700℃; the diameter and length of the rotary drum dryer are 2m and 20m respectively; the feeding rate of the rotary drum dryer is 15t / h; the discharging auger discharging rate is 10t / h; the water content of the ferroaluminum slag after drying is 8wt%, and the particle size is 6mm; the main components of the ferroaluminum slag are Ni 0.86wt%, Co 0.30wt%, Fe 20.50wt%, S 5.50wt%, Al 0.76wt%, and Na 1.03wt%.

[0082] (2) Grinding ingredients: The dried iron-aluminum slag and the solvent are mixed in a ratio of 1:0.03 and ground. The particle size of the mixture after grinding is less than 2 mm.

[0083] Among them, solvent 1 is bauxite.

[0084] (3) Suspension roasting pre-reduction: 3 tons of mixed material was put into the suspension roasting pre-reduction furnace for roasting pre-reduction, and flux 2 (mass ratio of 0.05:1 to mixed material) was added to adjust the slag shape, and 600Nm 3 / h combustion heat supply, 200Nm 3 / h reducing gas is used to pre-reduce the iron-aluminum slag, the reduction roasting temperature is 900℃, and the roasting time is 30min to obtain roasted sand.

[0085] The flux 2 is bauxite; the fuel is heavy oil; the reducing gas is carbon monoxide; and the main components of the roasted sand are Ni 2.50wt%, Co 0.50wt%, Fe 40.00wt%, Mn 1.35wt%, Al 2.00wt%, and Na 1.50wt%.

[0086] (4) Baked sand electric furnace smelting: 3 tons of baked sand was put into a 3000KVA electric furnace, 3% flux 3 and 7% reducing agent 1 were added, the reaction temperature was 1480°C, and the high temperature smelting time was 40 minutes. The reaction produced nickel iron, electric furnace slag and flue gas;

[0087] Among them, the flue gas is used to dry iron and aluminum slag raw materials after desulfurization and denitrification meet the standards, and nickel iron can enter the acid leaching process to prepare iron phosphate.

[0088] Wherein, the main components of the nickel iron are: Ni 25.00wt%, Co 3.50wt%, Fe 70.00wt%, S 0.40wt%, C 2.50wt%;

[0089] The main components of the nickel-iron slag are: Ni 0.10wt%, Co 0.008wt%, Fe 25.00wt%, Si 10.00wt%, Ca 6.00wt%, Al 5.00wt%, Mn 1.50wt%, Mg 0.35wt%, Cr 0.10wt%; the flux 3 is quartz stone and bauxite (mass ratio 1:1); the reducing agent 1 is graphite slag and graphite residual electrode (mass ratio 1:1).

[0090] (5) Electric arc furnace smelting of electric furnace slag and laterite nickel ore acid leaching residue: Electric furnace slag and laterite nickel ore acid leaching residue are mixed in a ratio of (1:2), and 2% flux 4 and 8% reducing agent 2 are added; the reaction is carried out at a furnace temperature of 1550℃, a reducing atmosphere, and normal pressure for 35 minutes to obtain nickel pig iron, electric furnace slag and flue gas.

[0091] The flux 3 is bauxite; the reducing agent 2 is graphite slag.

[0092] The main components of the laterite nickel ore acid leaching residue are: Ni 0.55wt%, Co 0.0008wt%, Fe 54.23wt%, Si 8.94wt%, Ca 0.76wt%, Al 4.12wt%, Mn 0.46wt%, Mg 0.66wt%, Cr 0.93wt%;

[0093] The nickel pig iron mainly comprises: Ni 2.43wt%, Co 0.03wt%, Fe 90.43wt%, S 0.57wt%, C 2.46wt%, Cr 2.87wt%, Mn 0.13wt%, P 0.10wt%;

[0094] The electric furnace slag mainly comprises: Ni 0.02wt%, Co 0.0007wt%, Fe 25.21wt%, Si 15.43wt%, Ca 20.47wt%, Al 6.67wt%, Mn 0.11wt%, Mg 4.38wt%, and Cr 0.13wt%.

[0095] Comparative Example 1

[0096] The difference between Comparative Example 1 and Example 1 is that Comparative Example 1 is not subjected to pre-reduction treatment, and all other aspects are the same.

[0097] This comparative example provides a method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue, comprising the following steps:

[0098] (1) Drying of iron-aluminum slag: 1 ton of iron-aluminum slag is loaded into the kiln top hopper for standby use. When feeding, the iron-aluminum slag enters the dehydrator from the hopper for dehydration and is then fed into the rotary drum dryer through the conveying auger. A gas generator is used to provide heat to the drying kiln to dry and remove free water and some adsorbed water.

[0099] Among them, the water content of the ferroaluminum slag is 30wt%; the capacity of the kiln top hopper is 5t; the water content of the material after dehydration by the dehydrator is 25%; the feeding rate of the conveying auger is 10t / h; the fuel of the gas generator is natural gas; the furnace temperature of the rotary drum dryer is 100°C; the diameter and length of the rotary drum dryer are 2m and 20m respectively; the feeding rate of the rotary drum dryer is 5t / h; the discharging auger discharging rate is 10t / h; the water content of the ferroaluminum slag after drying is 10wt%, and the particle size is 2mm; the main components of the ferroaluminum slag are Ni 0.40wt%, Co 0.10wt%, Fe 10.00wt%, S 1.00wt%, Al 0.50wt%, and Na 0.50wt%.

[0100] (2) Grinding ingredients: The dried iron-aluminum slag and the solvent are mixed in a ratio of 1:0.01 and ground. The particle size of the mixture after grinding is less than 2 mm.

[0101] Among them, solvent 1 is limestone.

[0102] (3) Suspension roasting pre-reduction: 1 t of the mixed material is subjected to electric furnace smelting: 1 t of the mixed material is placed in a 3000KVA electric furnace, 1% flux 3 and 3% reducing agent 1 are added, the reaction temperature is 1400°C, and the high-temperature smelting time is 15 minutes, and the reaction generates nickel iron, electric furnace slag and flue gas;

[0103] Among them, the flue gas is used to dry iron and aluminum slag raw materials after desulfurization and denitrification meet the standards, and nickel iron can enter the acid leaching process to prepare iron phosphate.

[0104] The main components of the nickel iron are: 9.23wt% Ni, 0.96wt% Co, 87.24wt% Fe, 1.57wt% S, and 1.00wt% C;

[0105] The flux 3 is limestone and quartz sand (mass ratio is 1:1); the reducing agent 1 is graphite slag.

[0106] (4) Electric arc furnace smelting of electric furnace slag and laterite nickel ore acid leaching residue: Electric furnace slag and laterite nickel ore acid leaching residue are mixed in a ratio of (1:1), and 1% flux 4 and 4% reducing agent 2 are added; the reaction is carried out at a furnace temperature of 1450°C, a reducing atmosphere, and normal pressure for 60 minutes to obtain nickel pig iron, electric furnace slag and flue gas.

[0107] The flux 4 is limestone; the reducing agent 2 is graphite slag.

[0108] The main components of the laterite nickel ore acid leaching residue are: Ni 0.05wt%, Co 0.0001wt%, Fe 57.00wt%, Si 12.00wt%, Ca 0.10wt%, Al 1.00wt%, Mn 0.10wt%, Mg 0.10wt%, and Cr 0.50wt%.

[0109] The nickel pig iron mainly comprises: 0.85wt% Ni, 0.009wt% Co, 92.25wt% Fe, 1.43wt% S, 1.87wt% C, 2.51wt% Cr, 0.18wt% Mn, and 0.35wt% P;

[0110] The main components of the electric furnace slag are: 0.05wt% Ni, 0.003wt% Co, 36.78wt% Fe, 13.64wt% Si, 15.52wt% Ca, 11.57wt% Al, 1.66wt% Mn, 3.87wt% Mg, and 0.81wt% Cr.

[0111] Comparative Example 2

[0112] The difference between Comparative Example 2 and Example 1 is that no laterite nickel ore acid leaching residue is added in step (5) of Comparative Example 2, and the other aspects are the same.

[0113] This comparative example provides a method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue, comprising the following steps:

[0114] (1) Drying of iron-aluminum slag: 1 ton of iron-aluminum slag is loaded into the kiln top hopper for standby use. When feeding, the iron-aluminum slag enters the dehydrator from the hopper for dehydration and is then fed into the rotary drum dryer through the conveying auger. A gas generator is used to provide heat to the drying kiln to dry and remove free water and some adsorbed water.

[0115] Among them, the water content of the ferroaluminum slag is 30wt%; the capacity of the kiln top hopper is 5t; the water content of the material after dehydration by the dehydrator is 25%; the feeding rate of the conveying auger is 10t / h; the fuel of the gas generator is natural gas; the furnace temperature of the rotary drum dryer is 100°C; the diameter and length of the rotary drum dryer are 2m and 20m respectively; the feeding rate of the rotary drum dryer is 5t / h; the discharging auger discharging rate is 10t / h; the water content of the ferroaluminum slag after drying is 10wt%, and the particle size is 2mm; the main components of the ferroaluminum slag are Ni 0.40wt%, Co 0.10wt%, Fe 10.00wt%, S 1.00wt%, Al 0.50wt%, and Na 0.50wt%.

[0116] (2) Grinding ingredients: The dried iron-aluminum slag and the solvent are mixed in a ratio of 1:0.01 and ground. The particle size of the mixture after grinding is less than 2 mm.

[0117] Among them, solvent 1 is limestone.

[0118] (3) Suspension roasting pre-reduction: 1 t of mixed material is put into the suspension roasting pre-reduction furnace for roasting pre-reduction, and flux 2 (with a mass ratio of 0.01:1 to the mixed material) is added to adjust the slag shape, and 100 Nm 3 / h combustion heat supply, 50Nm 3 / h reducing gas is used to pre-reduce the iron-aluminum slag, the reduction roasting temperature is 700℃, and the roasting time is 10min to obtain roasted sand.

[0119] The flux 2 is limestone; the fuel is pulverized coal; the reducing gas is carbon monoxide; and the main components of the roasted sand are Ni 1.50wt%, Co 0.35wt%, Fe 50.00wt%, Mn 2.10wt%, Al 3.00wt%, and Na 2.00wt%.

[0120] (4) Electric furnace smelting of roasted sand: 1 t of roasted sand is put into a 3000 KVA electric furnace, 1% flux 3 and 3% reducing agent 1 are added, the reaction temperature is 1400°C, and the high-temperature smelting time is 15 minutes. The reaction generates nickel iron, electric furnace slag and flue gas;

[0121] Among them, the flue gas is used to dry iron and aluminum slag raw materials after desulfurization and denitrification meet the standards, and nickel iron can enter the acid leaching process to prepare iron phosphate.

[0122] Wherein, the main components of the nickel iron are: Ni 10.00wt%, Co 2.50wt%, Fe 80.00wt%, S 0.60wt%, and C 3.00wt%; the main components of the nickel iron slag are: Ni 0.25wt%, Co 0.01wt%, Fe 10.00wt%, Si 10.00wt%, Ca 8.00wt%, Al 10.00wt%, Mn 2.50wt%, Mg 0.60wt%, and Cr 0.13wt%; the flux 3 is limestone and quartz sand (mass ratio is 1:1); and the reducing agent 1 is graphite slag.

[0123] (5) Electric arc furnace smelting of electric furnace slag: The electric furnace slag is added to the electric arc furnace, and 1% flux 4 and 4% reducing agent 2 are added; the reaction is carried out at a furnace temperature of 1450°C, a reducing atmosphere, and normal pressure for 60 minutes to obtain nickel pig iron, electric furnace slag, and flue gas.

[0124] The flux 4 is limestone; the reducing agent 2 is graphite slag.

[0125] The nickel pig iron mainly comprises: 0.51wt% Ni, 0.004wt% Co, 93.67wt% Fe, 1.32wt% S, 3.64wt% C, 0.91wt% Cr, 0.33wt% Mn, and 0.41wt% P;

[0126] The main components of the electric furnace slag are: 0.05wt% Ni, 0.002wt% Co, 33.24wt% Fe, 21.47wt% Si, 17.83wt% Ca, 11.51wt% Al, 1.76wt% Mn, 0.87wt% Mg, and 0.43wt% Cr.

[0127] Comparative Example 3

[0128] The difference between Comparative Example 3 and Example 1 is that nickel-iron slag is not added in step (5) of Comparative Example 2, and the other steps are the same.

[0129] This comparative example provides a method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue, comprising the following steps:

[0130] (1) Drying of iron-aluminum slag: 1 ton of iron-aluminum slag is loaded into the kiln top hopper for standby use. When feeding, the iron-aluminum slag enters the dehydrator from the hopper for dehydration and is then fed into the rotary drum dryer through the conveying auger. A gas generator is used to provide heat to the drying kiln to dry and remove free water and some adsorbed water.

[0131] Among them, the water content of the ferroaluminum slag is 30wt%; the capacity of the kiln top hopper is 5t; the water content of the material after dehydration by the dehydrator is 25%; the feeding rate of the conveying auger is 10t / h; the fuel of the gas generator is natural gas; the furnace temperature of the rotary drum dryer is 100°C; the diameter and length of the rotary drum dryer are 2m and 20m respectively; the feeding rate of the rotary drum dryer is 5t / h; the discharging auger discharging rate is 10t / h; the water content of the ferroaluminum slag after drying is 10wt%, and the particle size is 2mm; the main components of the ferroaluminum slag are Ni 0.40wt%, Co 0.10wt%, Fe 10.00wt%, S 1.00wt%, Al 0.50wt%, and Na 0.50wt%.

[0132] (2) Grinding ingredients: The dried iron-aluminum slag and the solvent are mixed in a ratio of 1:0.01 and ground. The particle size of the mixture after grinding is less than 2 mm.

[0133] Among them, solvent 1 is limestone.

[0134] (3) Suspension roasting pre-reduction: 1 t of mixed material is put into the suspension roasting pre-reduction furnace for roasting pre-reduction, and flux 2 (with a mass ratio of 0.01:1 to the mixed material) is added to adjust the slag shape, and 100 Nm 3 / h combustion heat supply, 50Nm 3 / h reducing gas is used to pre-reduce the iron-aluminum slag, the reduction roasting temperature is 700℃, and the roasting time is 10min to obtain roasted sand.

[0135] The flux 2 is limestone; the fuel is pulverized coal; the reducing gas is carbon monoxide; and the main components of the roasted sand are Ni 1.50wt%, Co 0.35wt%, Fe 50.00wt%, Mn 2.10wt%, Al 3.00wt%, and Na 2.00wt%.

[0136] (4) Electric furnace smelting of roasted sand: 1 t of roasted sand is put into a 3000 KVA electric furnace, 1% flux 3 and 3% reducing agent 1 are added, the reaction temperature is 1400°C, and the high-temperature smelting time is 15 minutes. The reaction generates nickel iron, electric furnace slag and flue gas;

[0137] Among them, the flue gas is used to dry iron and aluminum slag raw materials after desulfurization and denitrification meet the standards, and nickel iron can enter the acid leaching process to prepare iron phosphate.

[0138] Wherein, the main components of the nickel iron are: Ni 10.00wt%, Co 2.50wt%, Fe 80.00wt%, S 0.60wt%, and C 3.00wt%; the main components of the nickel iron slag are: Ni 0.25wt%, Co 0.01wt%, Fe 10.00wt%, Si 10.00wt%, Ca 8.00wt%, Al 10.00wt%, Mn 2.50wt%, Mg 0.60wt%, and Cr 0.13wt%; the flux 3 is limestone and quartz sand (mass ratio is 1:1); and the reducing agent 1 is graphite slag.

[0139] (5) Electric arc furnace smelting of laterite nickel ore acid leaching residue: 1% flux 4 and 4% reducing agent 2 are added to the laterite nickel ore acid leaching residue; the reaction is carried out at a furnace temperature of 1450°C, a reducing atmosphere, and normal pressure for 60 minutes to obtain nickel pig iron, electric furnace slag, and flue gas.

[0140] The flux 4 is limestone; the reducing agent 2 is graphite slag.

[0141] The main components of the laterite nickel ore acid leaching residue are: Ni 0.05wt%, Co 0.0001wt%, Fe 57.00wt%, Si 12.00wt%, Ca 0.10wt%, Al 1.00wt%, Mn 0.10wt%, Mg 0.10wt%, and Cr 0.50wt%.

[0142] The main components of the nickel pig iron are: 0.05wt% Ni, 0.0001wt% Co, 92.36wt% Fe, 0.98wt% S, 3.62wt% C, 2.75wt% Cr, 0.19wt% Mn, and 0.01wt% P;

[0143] The main components of the electric furnace slag are: 0.002wt% Ni, 0.0001wt% Co, 12.61wt% Fe, 21.48wt% Si, 26.31wt% Ca, 1.26wt% Al, 0.88wt% Mn, 1.68wt% Mg, and 0.57wt% Cr.

[0144] Effect Example 1

[0145] Quality of ferronickel and nickel pig iron: Tables 1 and 2 are comparative tables of the main element contents of ferronickel and nickel pig iron, respectively. Examples 1 to 3 are ferronickel and nickel pig iron prepared by the process scheme of this article. The grade of ferronickel meets the requirements of economic and technical indicators and can be used in the ferronickel wet leaching production line, while the nickel pig iron is directly sold for steelmaking.

[0146] Table 1 Comparison of main element contents of nickel iron

[0147] Table 2 Comparison of main element contents in nickel pig iron

[0148] Effect Example 2

[0149] Direct recovery rate of Ni, Co and Fe of ferronickel and nickel pig iron:

[0150] Table 3 and Table 4 are comparative tables of direct recovery rates of Ni, Co and Fe of ferronickel and nickel pig iron, respectively. The direct recovery rates of ferronickel, nickel and cobalt in Examples 1 to 3 are all greater than 90%, meeting the requirements of economic and technical indicators.

[0151] The direct recovery rate of nickel-iron metal (metal is Ni, Co, Fe) = (metal mass in nickel-iron / metal mass in ferroaluminum slag) × 100%.

[0152] Direct recovery rate of nickel pig iron metal (metal is Ni, Co, Fe) = (metal mass in nickel pig iron / metal mass in nickel ferronickel slag + laterite nickel ore acid leaching residue)

[0153] Table 3 Comparison of direct recovery rates of nickel, Co, and Fe

[0154] Table 4 Comparison of direct yields of nickel pig iron Ni, Co, and Fe

Claims

1. A method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue, characterized in that: The following steps are involved: Drying the iron-aluminum slag, mixing the iron-aluminum slag with flux 1, and then grinding the slag to obtain a mixed material; The mixed material and flux 2 are calcined and pre-reduced in a reducing atmosphere to obtain calcined sand; Smelting roasted sand, flux 3 and reducing agent 1 to obtain ferronickel and ferronickel slag; The nickel-ferronickel slag, laterite nickel ore acid leaching slag, flux 4 and reducing agent 2 are smelted to obtain nickel pig iron and electric furnace slag.

2. The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue according to claim 1, characterized in that: The main components of the ferroaluminum slag are: 0.40-1.00wt% Ni, 0.10-0.40wt% Co, 10.00-30.00wt% Fe, 1.00-8.00wt% S, 0.50-1.00wt% Al, and 0.50-1.50wt% Na.

3. The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue according to claim 1, characterized in that: The iron-aluminum slag is dried to a moisture content of ≤10 wt %.

4. The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue according to claim 1, characterized in that: The mass ratio of the iron-aluminum slag to the flux 1 is 1:(0.01-0.05).

5. The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue according to claim 1, characterized in that: The mass ratio of the mixed material to the flux 2 is 1:(0.01-0.08).

6. The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue according to claim 1, characterized in that: The temperature of the calcination pre-reduction is 700-1080° C. and the time is 10-50 minutes.

7. The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue according to claim 1, characterized in that: The main components of the roasted sand are: 1.50-3.60wt% Ni, 0.35-0.68wt% Co, 30.00-50.00wt% Fe, 0.50-2.10wt% Mn, 1.00-3.00wt% Al, and 1.00-2.00wt% Na.

8. The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue according to claim 1, characterized in that: The mass ratio of the roasted sand, flux 3 and reducing agent 1 is 1: (0.01-0.05): (0.03-0.1).

9. The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue according to claim 1, characterized in that: When the roasted sand, flux 3 and reducing agent 1 are smelted, the smelting temperature is 1400-1550° C. and the smelting time is 15-60 minutes.

10. The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue according to claim 1, characterized in that: The main components of the nickel iron are: 10.00-35.00wt% Ni, 2.50-5.00wt% Co, 60.00-80.00wt% Fe, 0.10-0.60wt% S, 1.50-3.00wt% C; and / or The main components of the nickel-iron slag are: 0.01-0.25wt% Ni, 0.001-0.01wt% Co, 10.00-30.00wt% Fe, 5.00-20.00wt% Si, 2.00-8.00wt% Ca, 2.00-10.00wt% Al, 0.50-2.50wt% Mn, 0.10-0.60wt% Mg, and 0.01-0.13wt% Cr.

11. The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue according to claim 1, characterized in that: The main components of the laterite nickel ore acid leaching residue are: 0.05-0.75wt% Ni, 0.0001-0.001wt% Co, 40.00-57.00wt% Fe, 4.00-12.00wt% Si, 0.10-1.00wt% Ca, 1.00-5.00wt% Al, 0.10-0.60wt% Mn, 0.10-1.00wt% Mg, and 0.50-1.20wt% Cr.

12. The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue according to claim 1, characterized in that: The mass ratio of the nickel-iron slag, the laterite nickel ore acid leaching slag, the flux 4, and the reducing agent 2 is 1: (1-3): (0.01-0.03): (0.04-0.11).

13. The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue according to claim 1, characterized in that: When ferronickel slag, laterite nickel ore acid leaching slag, flux 4 and reducing agent 2 are smelted, the smelting temperature is 1450-1600° C. and the smelting time is 20-60 min.

14. The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue according to claim 1, characterized in that: The nickel pig iron mainly comprises: 1.00-3.00wt% Ni, 0.01-0.05wt% Co, 80.00-96.00wt% Fe, 0.10-0.80wt% S, 1.00-3.00wt% C, 1.00-3.50wt% Cr, 0.05-0.25wt% Mn, 0.10-0.32wt% P; and / or The electric furnace slag mainly comprises: 0.01-0.03wt% Ni, 0.0001-0.001wt% Co, 5.00-30.00wt% Fe, 5.00-20.00wt% Si, 10.00-25.00wt% Ca, 3.00-10.00wt% Al, 0.10-1.50wt% Mn, 1.00-5.00wt% Mg, and 0.05-1.00wt% Cr.

15. The method for resource utilization of iron-aluminum slag and laterite-nickel ore acid leaching residue according to claim 1, characterized in that: The flux 1, flux 2, flux 3 and flux 4 are each independently selected from at least one of limestone, quartz sand, bauxite and iron block; and / or The reducing agent 1 and the reducing agent 2 are each independently selected from at least one of graphite slag, anthracite, and graphite anode residues.

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