36 results about "Laterite" patented technology

Method for producing ferronickel and removing chromium from nickel laterite ore. This disclosure discloses a method for producing ferronickel and removing chromium from nickel laterite ore, comprising the following steps: (1) washing and separating the nickel laterite ore to obtain an ore slurry and mineral aggregate, adding an alkaline liquid and a bromate, and introducing oxygen into the ore slurry to enable oxidation leaching, and then carrying out solid-liquid separation to obtain a chromium-containing solid and filtrate; (2) washing and separating the solid obtained in step (1) to obtain a solid phase and wash water, and mixing the solid phase with quicklime and a reducing agent to obtain a mixture; and (3) roasting and smelting the mixture obtained in step (2) successively to obtain a finished ferronickel product.The method can achieve chromium enrichment and produce ferronickel by smelting nickel laterite ore while removing chromium impurities, which can protect the safety of a furnace.

This invention relates to the field of geotechnical drilling engineering technology, and discloses a method for drilling small-diameter deep wells, comprising the following steps: using a positive circulation drilling rig to prepare a mud system based on the laterite soil of the construction site; using a composite reinforced roller cone bit for drilling operations in pebble layers; using a semi-automatic pulley system to connect or disconnect drill rods; using a positive circulation drilling rig to perform a segmented lifting and scraping wall composite process for drilling, in which a hole guide tool is used for scraping the wall; determining the depth of the aquifer before lowering the well casing; completing the butt joint connection of the well casing by welding, and completing the lowering and installation of the well casing; after the well casing is installed, sequentially performing mud replacement, air compressor agitation and well washing, and simultaneously completing the symmetrical backfilling of filter material; conducting a pumping test to complete the well completion quality acceptance. This invention can significantly improve drilling efficiency, well completion quality, and construction safety in complex pebble formations, while effectively reducing construction costs.

A comprehensive utilization method for valuable elements in hydrometallurgical slag of laterite nickel ore, comprising the following steps: S1. placing an iron-aluminum slag produced by laterite nickel ore hydrometallurgy in a tube furnace, and introducing an HCl gas stream for a one-stage distillation at 185-290° C. to obtain a one-stage distillation tail gas and a one-stage distillation residue; and condensing the one-stage distillation tail gas to obtain anhydrous AlCl3; S2. introducing an HCl gas stream to the one-stage distillation residue for a two-stage distillation at 320-500° C. to obtain a two-stage distillation tail gas and a two-stage distillation residue; and condensing the two-stage distillation tail gas to obtain anhydrous FeCl3; S3. subjecting the two-stage distillation residue to a leaching treatment by using a leaching solution to obtain a leaching residue and a leaching solution; subjecting the leaching solution to a scandium precipitation treatment to obtain a scandium precipitate and a de-scandiumed liquid; S4. adjusting the pH value of the de-scandiumed liquid to obtain an MHP. The obtained aluminum, iron, and scandium products have high purity and high recovery.

Disclosed is a process of utilising ferruginous laterite (14) in bauxite mining. The process may include providing a laterite source and a bauxite source (16) from a bauxite mine (12), and separating the laterite source into a first laterite fraction (24) that is enriched with a non-magnetic bauxite-like material and a second laterite fraction (22) that is iron enriched laterite. The second laterite fraction (22) may be directed to an iron refinery (44). A bauxite mine (12), Bayer plant (26), and iron refinery (44) configured to implement the process are also disclosed.

The application discloses a novel feeding device for laterite nickel ore, which comprises a rotating platform, a material pouring platform and a grabbing mechanism. A partition is arranged on the top of the rotating platform, so that the top of the rotating platform is divided into a first stacking pit and a second stacking pit. The rotating platform is used for rotating the first stacking pit and the second stacking pit to replace positions. The material pouring platform is arranged on both sides of the first stacking pit, and a stacking mechanism is arranged on the material pouring platform and used for pushing the materials on the material pouring platform from both sides to the stacking pit in the middle. The novel feeding device for laterite nickel ore provided by the application can pour materials for multiple transport vehicles side by side through the material pouring platform, and the materials can be concentrated and stacked in the stacking pit in the middle through the stacking mechanism. Then, the two stacking pits are replaced through the rotating platform, and the grabbing mechanism is used for grabbing and feeding the mineral materials, so that the transport vehicles are avoided from queuing, and the efficiency of pouring the mineral materials is improved.

This invention relates to the field of laterite nickel ore sintering technology and discloses a laterite nickel ore sintering mixing and preheating device, including a cylindrical body. The cylindrical body is inclined to facilitate material discharge. A support and a driving device are installed on the outside of the cylindrical body, and a feed hopper is installed at one end of the cylindrical body. The feed hopper is connected to the cylindrical body through a rotary sealing structure and is fixedly installed on the support. A discharge port is opened at the other end of the cylindrical body for material discharge. A discharge cylinder is connected inside the cylindrical body, and a turning shell is connected to the top of the discharge cylinder. The opening of the turning shell is located on the front side of the cylindrical body's rotation direction, allowing material to enter the turning shell as the cylindrical body rotates. An air inlet is opened on one side of the turning shell. This invention, by setting the material turning structure inside the device as a dual-channel structure and communicating with hot air, can extend the path of the hot air inside the device, increase the hot air residence time, and improve the material preheating efficiency and energy utilization rate.

This application provides a method for recovering nickel and cobalt elements, which involves acid leaching a mixed slurry comprising laterite nickel ore and a hard material to separate a solution containing nickel and cobalt elements; wherein the hard material comprises quartz sand and / or mullite. This recovery method utilizes the high hardness of the hard material to achieve online cleaning of scale layers inside the reactor, thus avoiding contamination of the acid leaching system and solving the problem of scale accumulation inside the reactor, thereby effectively improving the production efficiency of nickel and cobalt metals.

The present application relates to the technical field of smelting, and discloses a method for treating acid leaching residue of laterite nickel ore by means of double-side blowing, which comprises the following steps: S1. mixing acid leaching residue of laterite nickel ore and flux as raw materials, and spraying the raw materials into oxygen-enriched air and fuel for side blowing oxidation smelting to obtain oxidation smelting flue gas and oxidation smelting slag, and separating the oxidation smelting flue gas to obtain acid raw material gas which is sent to a sulfuric acid production process to produce sulfuric acid; S2. adding a reducing agent to the oxidation smelting slag, and spraying the oxidation smelting slag into oxygen-enriched air and fuel for side blowing reduction smelting to obtain molten iron, reduction smelting flue gas and reduction smelting slag, adding a desulfurizing agent to the molten iron for desulfurization, and producing iron ingots from the desulfurized molten iron. The present application can realize comprehensive utilization of acid leaching laterite nickel ore residue, fully recover residual valuable metals Fe, Ni and Co, fully develop and utilize components such as valuable metals, sulfur and tailings, and output zero solid waste, and turn waste into treasure.

The application discloses a cylindrical ore washing device for laterite nickel ore and belongs to the technical field of ore washing. The device comprises a plurality of ore washing cylinders, an ore slurry liquid inlet structure, a plurality of driving mechanisms and a water injection mechanism, an ore washing cavity is formed in the interior of each ore washing cylinder, the ore slurry liquid inlet structure is provided with a main conveying channel and a plurality of material conveying channels, a viscosity detection module for detecting the viscosity of the ore slurry is arranged in the main conveying channel, the plurality of driving mechanisms are connected with the plurality of ore washing cylinders respectively, and the water injection mechanism is arranged in each ore washing cylinder. The device can be used for targeted conveying and cleaning of raw materials according to the viscosity of the raw materials. For the ore slurry with relatively large viscosity, the ore slurry needs to be sent into the first-stage ore washing cylinder due to the large mud content, and the ore slurry with relatively small viscosity is conveyed into the subsequent ore washing cylinder according to the viscosity setting condition of the ore slurry, so that the ore washing steps are relatively reduced, the ore can be fully cleaned, and the ore washing efficiency is improved.

This application discloses a multi-stage overflow tank for laterite nickel ore hydrometallurgical wastewater, comprising an inlet tank and two overflow tank groups. The inlet tank has two overflow outlet gates. The two overflow tank groups are arranged side by side, and each overflow tank group includes multiple overflow tanks arranged longitudinally. The multiple overflow tanks of each overflow tank group are connected end to end through overflow outlets, and the overflow tank at the first end along the water flow direction is connected to the overflow outlet gate. Each overflow tank includes two overflow tank bodies arranged laterally and connected at the bottom. This application connects the two overflow tank groups through the inlet tank to form two overflow paths. Each overflow path, with the cooperation of bottom-connected and end-to-end connected overflow outlets, forms an S-shaped flow channel combining vertical and horizontal levels, improving the floc deposition effect. Furthermore, one overflow path can be selectively closed for easy cleaning, allowing for uninterrupted wastewater treatment.

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.

This invention provides a method for producing hot-pressed iron blocks from laterite nickel ore hydrometallurgical slag, belonging to the field of laterite nickel ore hydrometallurgical slag utilization technology. The process includes the following steps: S1, pressure filtration and water removal, reducing the moisture content of the wet slag to ≤30%; S2, drying and crushing, reducing the moisture content of the dried slag to ≤5%; S3, preheating, decrystallization, sulfate decomposition, and desulfurization, generating SO2 gas and hot-roasted sand containing oxides such as Fe2O3, Fe3O4, and CaO; S4, the hot-roasted sand is reduced in a multi-stage fluidized bed consisting of a second-stage pre-reduction fluidized bed and a third-stage final reduction horizontal bubbling fluidized bed, using H2 as the reducing agent. After reduction in the second and third-stage reduction fluidized beds, the degree of reduction reaches 65-85% and the metallization rate is >93%, respectively; S5, the reduced iron powder from the third-stage final reduction horizontal bubbling fluidized bed is processed into hot-pressed iron blocks by a hot-pressing device. The purified high-temperature flue gas is then recycled in the burner of a flash heater, thus utilizing the wet smelting slag of laterite nickel ore.

This application provides a method for catalytic oxidation-stepwise precipitation of lateritic nickel ore leaching solution, relating to the field of hydrometallurgy. The method includes: adding a catalytic oxidant and a first neutralizing agent to the lateritic nickel ore leaching solution to obtain a first filtrate and iron slag; adding a catalytic oxidant, a second neutralizing agent, and a first agglomerating agent to the first filtrate to obtain a second filtrate and a second precipitate; adding a third neutralizing agent and a first reducing agent to the second filtrate to obtain a nickel-cobalt precipitate and a third filtrate; adding a fourth neutralizing agent and a second reducing agent to the third filtrate to obtain a fourth precipitate and a fourth filtrate; mixing the second precipitate with the third reducing agent and performing reduction leaching; adding a second agglomerating agent and a fifth neutralizing agent to obtain a silicon-aluminum precipitate and a manganese-scandium filtrate; extracting the manganese-scandium filtrate, with manganese entering the raffinate; adding a catalytic oxidant and a sixth neutralizing agent to the raffinate to obtain manganese oxide. This application enables stepwise element recovery, offering advantages such as recovering a wide variety of elements and minimizing resource waste.

The application provides a process method for improving quality and efficiency of oxygen-enriched sintering of laterite nickel ore, comprising: preparing a mixture, wherein the mixture comprises: iron concentrate powder 0%-8%, solid fuel 5%-10%, laterite nickel ore 42%-58%, iron oxide scale 1.00%-3.00%, quicklime 4%-8%, and returned ore 25%-35%; stirring the mixture to be uniform, controlling the moisture content of the mixture to be 12.1%-13.5%, the average particle size of the mixture to be 3.40-4.66 mm, and the proportion of the particle size of-1 mm to be less than or equal to 7%; loading the prepared mixture into a sintering device, laying 2-4 kg of bottom material, and controlling the layer height of the material to be 650-750 mm; and sintering by using an oxygen-enriched sintering mode. By optimizing the ore blending structure and the oxygen-enriched sintering parameters, the application realizes the synchronous improvement of the sintering quality and the production efficiency.

The application provides a method for preparing active magnesium oxide from laterite nickel ore nickel precipitation wastewater, and relates to the technical field of magnesium oxide preparation. The method comprises the following steps: S1, collecting laterite nickel ore nickel precipitation wastewater, S2, multi-stage cooperative impurity removal, S3, ultrasonic dispersant composite carbonization, S4, microwave-assisted hydrothermal activation, S5, structured anti-fouling calcination, S6, surface modification and functional modification, S7, mother liquor circulation and resource utilization, and S8, active magnesium oxide. Through multi-stage cooperative impurity removal and gradient calcination, the magnesium recovery rate is improved compared with the traditional process, 6-12 kg of high-purity magnesium sulfate can be extracted per ton of wastewater, the raw material dependence of laterite nickel ore smelting is significantly reduced, the concentrated mother liquor is purified and recycled for more than 8 times, water consumption is reduced, and comprehensive energy consumption is reduced. The active magnesium oxide obtained by the method has a purity of 98.5% or more, a uniform particle size distribution, and a specific surface area of 85-120 m 2 / g, and exhibits excellent surface activity and reaction activity.

The application belongs to the technical field of hydrometallurgy and chemical industry, and specifically discloses a method for preparing a nickel-cobalt-manganese ternary solution from a high-pressure leaching solution of laterite nickel ore. The method for preparing the nickel-cobalt-manganese ternary solution comprises the following steps: taking the high-pressure leaching solution of laterite nickel ore, adjusting pH, using a carboxylic acid extractant for countercurrent extraction to obtain a first organic phase containing nickel, cobalt and manganese; using a sulfuric acid washing solution for countercurrent washing to obtain a second organic phase; using a sulfuric acid stripping solution for countercurrent stripping to obtain a third aqueous phase containing nickel, cobalt and manganese; and purifying to obtain a high-purity nickel-cobalt-manganese ternary solution. The method has higher operation stability, lower reagent consumption and a simplified process flow, and is suitable for the preparation of high-purity ternary precursor materials.

This invention provides a wet screening and impurity removal device for laterite nickel ore, comprising a frame, with blade shafts evenly arranged in rows inside the frame. Both ends of the blade shafts are rotatably connected to anti-reverse devices inside the frames on both sides. A first and second geared motor group are rotatably connected to the outer side of the anti-reverse devices. A connecting plate is installed between the two ends of the frame, with fixed blades installed inside the connecting plate. A conveyor slope is installed below one side of the frame, with its lower end facing the return ore belt. Multiple belt drive shafts are installed inside the return ore belt, with its end facing the raw material discharge port. This invention, by using 10 5.5kW geared motors at the front end and 18 4kW geared motors at the rear end, ensures stable discharge speed, saves energy, avoids waste, and reduces costs. Furthermore, each geared motor controls one blade shaft, and the gap between the rotating blades on the blade shafts is fixed, ensuring a stable separation particle size of 100mm, thus efficiently separating foreign matter from nickel ore.

A method for dynamically controlling high-pressure leaching reaction condition of laterite nickel ore includes: setting a target temperature and a target pressure of an high-pressure reactor; obtaining the heat power required for heating the feeding pulp to the target temperature; obtaining the heat power brought by the acid; obtaining a required heat power of a new steam; obtaining a required flow rate of the new steam; adjusting a real-time flow rate of the new steam to the required flow rate of the new steam, adjusting an exhaust valve opening degree and a discharge flow rate of the high-pressure reactor to make the real-time pressure of the high-pressure reactor equal to the target pressure, adjusting the flow rate of the new steam to make the real-time temperature of the high-pressure reactor equal to the target temperature. The beneficial effect of this disclosure is: the reaction condition of the high-pressure leaching reaction is initially determined according to the feed condition, and then the reaction conditions are adjusted according to the real-time temperature and pressure of the high-pressure reactor. Through the cooperation of the above-mentioned two control modes, the temperature and pressure of the high-pressure reactor can be maintained under an optimal temperature and pressure condition, thereby improving a leaching efficiency of laterite nickel ore.

This invention provides a comprehensive recovery method for laterite nickel ore and sulfate wastewater. This invention eliminates the energy-intensive evaporation and crystallization stage in traditional sulfate wastewater treatment. It not only successfully captures heavy metals (nickel, cobalt, and manganese) from sulfate wastewater and laterite nickel ore, converting them into precipitates for recovery and yielding a high-purity sodium sulfate solution that can be directly used in other processes, but also achieves the resource utilization of laterite nickel ore. This comprehensive recovery of sulfate wastewater and laterite nickel ore is achieved without the generation of metal sludge during the recovery process, significantly reducing wastewater discharge and resource waste, and transforming waste management costs into revenue.

This invention relates to a high-pressure acid leaching test system for lateritic nickel ore, comprising a reactor and a feeding assembly. The feeding assembly includes two feeding boxes, two door panels, and two unloading components. The two door panels are hinged to openings at the bottom of the two feeding boxes to open and close the openings. The two feeding boxes are fixedly connected and slidably and sealingly connected to a through-slot on the reactor. When one feeding box slides until its bottom door panel is inside the reactor, the other feeding box slides until its bottom door panel is outside the reactor. The two unloading components are respectively built into the two feeding boxes and can move vertically through the openings. The unloading components are used to carry lateritic nickel ore. During the movement of the feeding boxes, the reactor is kept under high pressure during material replacement without the need for depressurization, effectively shortening the test cycle. At the same time, the removal of the solid phase in the previous reaction and the feeding of lateritic nickel ore in the next reaction are carried out simultaneously, further shortening the test cycle.

A multi-stage mixing high-pressure reactor for high-pressure leaching of laterite nickel ore, belonging to the field of metallurgical technology, includes a reactor body (1), several overflow components (2), and several guide components (3). The reactor body (1) has an inlet pipe (11) and an outlet pipe (12) at both ends. Several overflow components (2) are sequentially arranged inside the reactor body (1) along the material flow direction to divide the interior of the reactor body (1) into multiple reaction zones (13). Each overflow component... Each component (2) includes a first overflow plate (21), a second overflow plate (22), and a pusher (23); the pusher (23) has a pusher end disposed between the first overflow plate (21) and the second overflow plate (22); a plurality of the guide components (3) are disposed one-to-one at each of the overflow outlets (221); the reactor can promote the flow and mixing of materials, making it less likely for materials to settle to the bottom. By promoting the flow of materials, it also helps to delay scaling and can improve the mixing and reaction efficiency of slurry.

A device and method for selective reduction and stepwise smelting of limonite laterite nickel ore to produce nickel-cobalt alloy and molten iron belong to the field of mineral processing and metallurgical technology. The device includes a silo, a screw feeder, a multi-stage cyclone preheating and drying system, a flue gas dust removal system, a fluidized bed roasting main furnace heating system, a first cyclone separator, a fluidized bed reduction reactor, a second cyclone separator, a first electric furnace smelting reactor, and a second electric furnace smelting reactor. The method steps are as follows: limonite laterite nickel ore is placed in the silo; it is fed into the multi-stage cyclone preheating and drying system, preheated, and then enters the roasting main furnace for heating, dehydration, and decomposition to form dried material; after gas-solid separation, the solid material enters the reduction reactor, and the high-temperature flue gas is returned to the system for preheating and drying; nitrogen and reducing gas are introduced into the inlet of the reduction reactor respectively, forming reduced material that flows out from the outlet; the solid material after gas-solid separation enters the smelting reactor, and excess gas is burned for heating; the iron-rich slag is melted and reduced, and then discharged after smelting.

This invention provides a method for removing hexavalent chromium during high-pressure acid leaching of laterite nickel ore. The method includes the following steps: washing, screening, classifying, beneficiating, and grinding the laterite nickel ore to obtain leaching raw material; separating chromite during beneficiation; mixing high-grade nickel matte slag with the leaching raw material to obtain a compound leaching material; and subjecting the compound leaching material to high-pressure acid leaching to remove hexavalent chromium. This invention provides a method for removing hexavalent chromium from laterite nickel ore during high-pressure acid leaching by separating a portion of chromite through physical beneficiation and then removing Cr(VI) through Fe(II) dissolved in the high-grade nickel matte slag, achieving highly efficient removal of Cr(VI) during the high-pressure leaching reaction.

This application discloses a distributor for a spiral sluice box for laterite nickel ore, comprising: an outer cylinder, an inner cylinder, several spiral tubes, and several slurry discharge pipes. The inner cylinder is located inside the outer cylinder and is connected to the slurry inlet pipe. An annular cavity is formed between the outer wall of the outer cylinder and the inner wall of the inner cylinder. Several spiral tubes are evenly arranged around the periphery of the inner cylinder and are all located within the annular cavity. One end of each spiral tube is connected to the interior of the inner cylinder, and the other end is spirally inclined downwards, so that the slurry forms a swirling flow within the annular cavity after being discharged through the spiral tube. Several slurry discharge pipes are evenly arranged around the periphery of the outer cylinder and are all connected to the annular cavity. This application designs the distributor as an inner and outer cylinder, preventing slurry from depositing inside the inner cylinder. The discharge from the spiral tubes impacts the bottom of the annular cavity formed between the inner and outer cylinders, causing the slurry to swirl within the annular cavity, thus avoiding slurry deposition within the annular cavity and improving discharge efficiency.

This invention belongs to the field of laterite nickel ore beneficiation technology, specifically relating to a method for efficiently recovering nickel and cobalt from gravel. This invention separates gravel into different particle size grades through two-stage screening, and adopts appropriate smelting methods (hydrometallurgical smelting, post-grinding smelting, pyrometallurgical smelting) based on the characteristics of different gravel grades. For example, the smaller third-grade gravel is directly subjected to hydrometallurgical smelting, while the slightly larger second-grade gravel is smelted after grinding and classification. This approach adapts to different material properties and maximizes resource utilization, avoiding the resource waste that may result from traditional single-processing methods. Furthermore, it allows for more precise processing of each particle size grade, effectively improving the recovery efficiency and purity of nickel and cobalt. In particular, for the third and second-grade gravel rich in nickel and cobalt, the refined processing significantly improves resource utilization.

This invention relates to a desulfurization method for leaching residue from high-pressure acid leaching of laterite nickel ore, and pertains to the treatment of leaching residue from high-pressure acid leaching of laterite nickel ore. The method includes the following steps: S1, drying and dispersing: the leaching residue from high-pressure acid leaching of laterite nickel ore is pressure filtered, dried, and dispersed to reduce its moisture content to ≤3%, resulting in pretreated dried nickel slag; S2, suspension roasting desulfurization: the pretreated dried nickel slag is fed into a suspension roasting furnace system and subjected to suspension roasting under a weakly reducing atmosphere and a low gas-solid mass ratio, allowing the encapsulated sulfates in the nickel slag to fully decompose, thereby achieving desulfurization and ultimately achieving a stable reduction in the total sulfur mass fraction of the desulfurized nickel slag to ≤0.1%. In step S1, the particle size D90 of the dried material is ≤75μm; in S2, the weakly reducing atmosphere during roasting has a CO content ≤5%, the roasting temperature is 850℃~950℃, and the material residence time is 10~30s. Using this method, the total sulfur content of nickel slag can be stably reduced from 2.3% (original slag sulfur content) to ≤ 0.1%, with a stable desulfurization rate of ≥ 95%.

The application discloses a kind of mineral resources reserves estimation method using fractal algorithm, step (S1): resource distribution map generation based on machine learning;Step (S2): feature matching mine site identification based on fractal geometry;Step (S3): reserve estimation based on regression analysis.The application is a new mineral resources reserves estimation calculation scheme used in the field of intelligent technology of mineral exploration.The scheme uses the "fractal" method in mathematics, combined with AI technology, to provide a complete solution for resource reserves calculation of target mine, especially weathered bauxite, weathered laterite nickel ore and other types of near-surface mine, to achieve the task goal of calculating the mineral resources reserves of target mining area without field exploration data or only using a small amount of artificial exploration data.

The application provides a method for removing impurities and oil from a filter rod in laterite nickel ore hydrometallurgy. The method comprises the following steps: using a first cleaning solution to dynamically clean the filter rod to be treated to remove oil stains on the surface of the filter rod; the first cleaning solution comprises an alkaline reagent and a surfactant; using a second cleaning solution to dynamically clean the filter rod after oil removal to remove metal impurities on the surface of the filter rod; the second cleaning solution comprises an acidic reagent and a fluoride. The application adopts a step-by-step strategy of "oil removal + impurity removal", and the alkaline reagent and the surfactant cooperate to efficiently strip the oil stains on the surface of the filter rod, opening a path for subsequent impurity removal; the acidic reagent and the fluoride cooperate to efficiently remove impurities such as nickel, cobalt and lead on the surface of the filter rod, and the fluoride ions can form water-soluble complexes with the above metal ions, completely removing the impurity metal residue problem and achieving deep regeneration of the filter rod. The strategy has excellent oil removal and impurity removal effect and regeneration performance.

The application discloses a method for recovering nickel and cobalt from laterite nickel ore, and the method comprises the following steps in sequence: grinding, pre-neutralization, synergistic pressure acid leaching, iron and aluminum removal, and nickel and cobalt precipitation. The method is targeted at the characteristics of laterite nickel ore and pyrite, and through the pre-neutralization and leaching steps, the acid and heat in the reaction process of the pyrite are fully utilized, thereby greatly reducing the steam heat source (saving 40% to 80%) and the amount of sulfuric acid (saving 80% to 99%) and improving the resource utilization rate of iron slag (the iron content is greater than 60%, which can be directly used as a raw material for ironmaking).