349 results about "Laterite" patented technology

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 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 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.

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 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.

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 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.

The invention discloses an all-component comprehensive utilization method for limonite type laterite-nickel ore, and belongs to the technical field of mineral processing and metallurgy. According to the method, multi-stage preheating and selective reduction are combined, accurate regulation and control of ore phase conversion are achieved by optimizing temperature and atmosphere conditions, metallic nickel and cobalt generated through reduction form a stable complex in the ammonia leaching process, and magnetite serves as an indissolvable magnetic phase to be left in slag. The reaction temperature is effectively reduced, the energy consumption is reduced, and the gas-solid mass transfer efficiency and the heat transfer efficiency are remarkably improved. The mineral structure is regulated and controlled through selective reduction, the adverse effects of excessive reduction, sintering, follow-up leaching difficulty and the like of iron oxide in the high-temperature roasting process of a traditional rotary kiln are avoided, and efficient selective leaching of nickel and cobalt and recovery and enrichment of magnetic iron ore are achieved. And meanwhile, the nickel and cobalt leaching efficiency is remarkably improved, interference of iron impurities on a leaching solution is reduced, and an economical and feasible new technical path is provided for resource comprehensive utilization and green metallurgy development of the limonite type laterite-nickel ore.

The invention provides a method for recovering laterite-nickel ore tailings, which comprises the following steps: (1) slurrying laterite-nickel ore tailings, and carrying out acid leaching treatment to obtain leached residues; (2) mixing the leaching residues with a reducing agent, and carrying out reduction desulfurization treatment to obtain reducing residues; (3) carrying out superfine grinding treatment on the reducing slag, and carrying out first magnetic separation treatment to obtain a first magnetic separation material; (4) the first magnetic separation material and a dispersing agent are mixed for second magnetic separation treatment, and a second magnetic separation material is obtained; and (5) carrying out alkali washing purification treatment on the second magnetic separation material, and drying to obtain sponge iron. According to the method, the problems of excessive accumulation, paid landfill and difficulty in recycling of the laterite-nickel ore tailings are solved, the laterite-nickel ore hydrometallurgy tailings are prepared into the sponge iron, and the magnetic separation tailings obtained in the recovery process can be used for producing building materials, cement and other additional products.

The invention provides a method for recovering manganese from laterite-nickel ore. The method comprises the following steps: sequentially carrying out precipitation reaction and liquid-solid separation on substances comprising an alkaline precipitator, an oxidant and a nickel-cobalt-manganese-containing heavy metal solution to obtain a nickel-cobalt-manganese hydroxide product and a magnesium-containing solution. According to the principle, an oxidizing agent is added in the precipitation process, the redox environment in the nickel-cobalt-manganese containing heavy metal solution is changed, and manganese can be precipitated together with nickel and cobalt under the alkaline condition. Specifically, after a proper oxidant is added into the solution, divalent manganese can be oxidized into a high valence state, so that the divalent manganese can form stable and insoluble precipitates more easily under an alkaline condition, and the stable and insoluble precipitates and nickel and cobalt hydroxides are separated out together, thereby realizing high-efficiency recovery of manganese.

The present invention discloses a method for strengthening the sintering of limonite-type laterite nickel ore. The sintering raw materials including limonite-type laterite nickel ore, iron concentrate, fuel, flux and return fines are successively mixed, granulated and sintered to obtain limonite-type laterite nickel ore sinter. By adjusting the aluminum content of the sintering mixture within an appropriate range, this method can reduce the liquid phase formation temperature, increase the liquid phase formation amount, improve the ore-forming conditions of the sinter, and enhance the strength of the limonite-type laterite nickel ore sinter. Moreover, this method reduces costs, has simple operation and strong practicability, and has obvious economic benefits.

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.

The invention discloses a laterite nickel ore resource management method. The method comprises the steps of multi-source data integration and three-dimensional geological modeling, modular mining design and boundary optimization, refined mining and grade control, and digital ore blending and production monitoring. According to the method, a multi-software cooperative working platform is constructed, and three-dimensional geological modeling and spatial analysis technologies are integrated, so that a high-precision geological model is established; on the basis of the high-precision geologic model, a modular mining design and a dynamic road system are innovatively adopted to realize high efficiency and flexibility of the mining process; meanwhile, an ore dilution prediction model is established through a big data analysis technology, grade control and ore blending optimization are carried out on the whole process of ore from mining to transportation, and stable quality of a final product is ensured.

The present invention discloses a feeding equipment for laterite nickel ore, including a rotating platform, a material unloading platform and a grabbing mechanism. A partition is provided on the top of the rotating platform to separate the top of the rotating platform into a first stacking pit and a second stacking pit. The rotating platform is used to rotate the first stacking pit and the second stacking pit to replace the position; the material unloading platform is arranged on both sides of the first stacking pit, and a stacking mechanism is arranged thereon to push the material on the material unloading platform from both sides to the middle stacking pit. The new type of laterite nickel ore feeding equipment provided by the present invention provides a material unloading platform for multiple transport vehicles to pour materials side by side, and the stacking mechanism is used to stack them centrally in the middle stacking pit, and then the two stacking pits are replaced by the rotating platform, and the grabbing mechanism is used to grab and put the ore, which avoids the queuing of transport vehicles and improves the efficiency of pouring ore.

The invention discloses a low-energy-consumption method for preparing high-metallization-ratio reduced iron blocks from laterite-nickel ore high-pressure acid leaching residues, and belongs to the technical field of metallurgical solid waste recycling. The method comprises the following steps: performing low-temperature reduction roasting on the laterite-nickel ore high-pressure acid leaching residues in a reducing atmosphere to obtain primary roasted sand; carrying out high-temperature desulfurization roasting on the primary roasted product in a non-reactive atmosphere to obtain a final roasted product; and carrying out hot press molding on the final roasted product to obtain the reduced iron block. According to the method, the technological process of reduction, desulfurization and hot pressing is adopted, the method has the advantages that the process is compact, energy consumption is low, iron and sulfur elements are easy to recover and the like, the laterite-nickel ore high-pressure acid leaching residues can be efficiently converted into high-quality reduced iron blocks with high strength, low impurity and high metallization ratio, high-concentration SO2 meeting the acid making requirement is synchronously obtained, and the method is suitable for industrial production. According to the method, large-scale and high-valued clean utilization of iron and sulfur resources in the laterite-nickel ore high-pressure acid leaching residues is achieved, and the method is mild in technological condition and stable in operation and has a good industrial application prospect.

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.

The present application discloses an ion exchange system for a laterite nickel ore leaching solution, comprising a plurality of ion exchange resin columns connected end to end in sequence. Each ion exchange resin column comprises a head portion, a middle portion, and a tail portion which are connected in sequence. A head portion perforated plate and a head portion pipe in communication with a cavity inside the head portion are rotatably provided on the end of the head portion away from the middle portion, and a tail portion perforated plate and a tail portion pipe in communication with a cavity inside the tail portion are provided on the end of the tail portion away from the middle portion, wherein the head portion perforated plate is attached to the tail portion perforated plate of the previous ion exchange resin column and can rotate relative to the tail portion perforated plate, so that the head portion perforated plate and the tail portion perforated plate are at least in a complete connection state in which hole positions are completely aligned and a disconnection state in which the hole positions are completely misaligned. The ion exchange system provided by the present application allows for switching of the series-connection state or parallel-connection state of the ion exchange resin columns when performing various procedures such as elution, desorption, and backflushing, thereby improving the treatment efficiency.

The invention relates to a laterite nickel ore double-screw ore washing system which comprises a double-screw ore washer, a movable screen and a conveying belt, the double-screw ore washer is provided with a slurry outlet, the feeding end of the movable screen is connected with the slurry outlet, the movable screen screens slurry guided out through the slurry outlet, and the conveying belt is arranged on the conveying belt. The movable screen can drive materials screened by the movable screen to move from the feeding end to the discharging end of the movable screen, and the conveying belt is arranged on the lower side of the discharging end of the movable screen. Mineral aggregate is guided into the double-screw ore washer, the double-screw ore washer scrubs the mineral aggregate, scrubbed ore pulp flows to the movable screen from the pulp outlet, the movable screen screens the ore pulp, scum in the ore pulp is intercepted, and the scum falls onto the conveying belt and is conveyed to a designated position through the conveying belt.

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 present invention belongs to the technical field of hydrometallurgy, and provides a method for treating lateritic nickel ores. The treatment method achieves both the recovery of nickel and cobalt and the production of a by-product, i.e. a ferrosilicon alloy, by means of beneficiation, high-pressure acid leaching, cyclic leaching and ore pulp neutralization, CCD washing, underflow filter pressing, and reduction smelting. In the method, on the basis of the extraction of nickel and cobalt by means of existing conventional methods, reduction smelting is performed on leaching residues obtained from the high-pressure acid leaching of high-silicon lateritic nickel ores, so as to obtain a ferrosilicon alloy; therefore, not only environmental protection problems caused by the generation of a large amount of leaching residues are solved, but iron and silicon are also productized and made to be high-value-added products. In the method, the leaching rates of nickel and cobalt are high after high-pressure acid leaching is utilized; moreover, due to the fact that iron is essentially in the form of hematite at a high temperature and high pressure, the consumption of sulfuric acid and lime in a subsequent iron removal process is low, and good economic returns are yielded; the comprehensive recovery of elements such as nickel, cobalt, iron and silicon is achieved by means of step-by-step enrichment and purification; and the method has significant advantages in terms of the treatment of high-silicon and high-iron lateritic nickel ores.

The application discloses a method for recovering nickel from laterite nickel ore, which comprises the following steps: 1) after drying, the laterite nickel ore is mixed with reducing coal and sulfuration agent, and the mixture is sent to an oxygen-rich side-blown furnace for reduction smelting, the temperature and reducing atmosphere in the furnace are controlled by controlling the oxygen-material ratio and oxygen-coal ratio, and low nickel matte, slag and dust are obtained; 2) the low nickel matte is blown, high nickel matte and blown slag are obtained by controlling the fuel rate and slagging rate; 3) the high nickel matte is ground and roasted after water quenching, and the roasted sand is subjected to reduction smelting to obtain refined nickel alloy; and 4) the refined nickel alloy is cast into anode plates, and electrolytic refining is carried out to obtain electrolytic nickel. The electrolytic nickel contains 99.92-99.97% of nickel. The application realizes comprehensive utilization of the laterite nickel ore, and low nickel matte, high nickel matte, nickel alloy and electrolytic nickel products are obtained.

The application discloses a bainite plastic die steel based on laterite nickel ore and a manufacturing method thereof, and ingredients of the bainite plastic die steel are as follows in percentage by mass: C 0.01-0.15%, Si 0.25-1.0%, Mn 0.5-2.0%, P≤0.045%, S≤0.015%, Cr 2.0-5.0%, Ni 1.01-2.0%, B 0.0010-0.0050%, N 0.004-0.008%, and the rest contains Fe and other inevitable impurities, and the following conditions are simultaneously met: hardness index: 28≤13.8+132.8C+2.34Mn+1.84Cr-1.12Ni≤38, bainite index: C 0.5 ×Mn 1.4 ×Cr 4 ×Ni×N ‑1.05 / 20≤2000. The die steel has a tensile strength of greater than or equal to 800 MPa, a hardness of 28-38 HRC, a cross-section hardness difference of a steel plate with a thickness of 15-300 mm of less than or equal to 2 HRC, flatness of less than or equal to 2 mm / m, and flaw detection quality meeting the E / e level requirements in the SP1921-84 standard. The die steel can be applied to the manufacturing of plastic parts in the fields of automobiles, household appliances, medical treatment and electronics.

The present invention discloses a stirring structure of laterite nickel ore autoclaves, comprising: a stirring component, a driving component and a scraping component. The stirring component has a fixed part and a movable part, the fixed part is used to stir the material at the bottom of the autoclave body, and the movable part is arranged above the fixed part and can move relative to the fixed part, so that a stirring zone is formed between the blades outside the movable part, which gradually expands when the movable part moves toward the fixed part and gradually shrinks when the movable part moves away from the fixed part. The driving component is connected to the stirring component and is used to drive the stirring component to rotate; one end of the scraping component forms a scraping end for scraping dirt on the inner wall of the autoclave body, and the other end of the scraping component is connected to the movable part. The stirring component of the present invention can drive the scraping component to move up and down in the autoclave body along with the movement of the movable part during stirring, so that the scraping component scrapes at different positions of the inner wall of the autoclave body, which is beneficial to prevent the formation of a scale layer on the inner wall of the autoclave body. At the same time, it can also scrape off the scale on the inner wall, and the descaling effect is better.

The present invention discloses a laterite nickel ore slurry thickener, comprising a thickener body and a pressing mechanism; the thickener body has a conical accommodating chamber; the pressing mechanism comprises a lifting plate, a plurality of vertical plates, a plurality of sieve plates, a lifting drive member and a posture adjustment assembly, the lifting plate is arranged in the accommodating chamber, each of the vertical plates is fixed below the lifting plate, sieve holes are uniformly and densely opened on the sieve plate, and the posture adjustment assembly is connected to each of the sieve plates and is used to drive the sieve plates to rotate. The beneficial effect of the present invention is that each of the sieve plates is driven to rotate to be perpendicular to the vertical plates by the posture adjustment assembly, and the lifting plate is driven to descend by the lifting drive member. At this time, each sieve plate moves downward, and particles in the ore pulp with a particle size smaller than the sieve hole can directly pass through the sieve plate, while particles in the ore pulp with a particle size larger than the sieve hole are intercepted by the sieve plate and move downward with the sieve plate, thereby accelerating the sinking of particles in the ore pulp and improving the ore pulp concentration rate.

The present invention provides a method for producing unburned bricks using high-pressure acid leaching smelting tailings from laterite nickel ore, and the unburned bricks. The method comprises the following steps: S10: dehydrating and crushing the high-pressure acid leaching smelting tailings from laterite nickel ore; S20: mixing the crushed high-pressure acid leaching smelting tailings from laterite nickel ore with a certain amount of aggregate, cement, and water, stirring evenly to obtain a mixed slurry, and then pressing the mixed slurry into brick blanks; S30: curing the pressed brick blanks for a period of time to produce unburned bricks. This method achieves resource utilization of the high-pressure acid leaching smelting tailings from laterite nickel ore by mixing the high-pressure acid leaching smelting tailings from laterite nickel ore, aggregate, and cement in a certain proportion and then pressing them into bricks.

The present invention provides a combined beneficiation method for laterite nickel ore. The method comprises the following steps: a first cyclone separation, a spiral chute, a multi-stage shaking table classification, a plurality of weak magnetic separations and a plurality of spiral classifications, so as to separate chromite from the laterite nickel ore, thereby obtaining a first chromium concentrate, a chromium middling, a weak magnetic separation middling and a mixed light ore; and a subsequent combined process of multiple ball millings, a second cyclone, a weak magnetic separation and a strong magnetic separation is used to further enrich and separate chromium from the mixed light ore, the weak magnetic separation middling and the limonite and chromite that have been missed in the strong magnetic separation magnetic material, thereby screening out more second chromium concentrate, facilitating a reduction in the chromium content in a subsequent high-pressure leaching stock solution, thereby achieving comprehensive utilization of the chromium element.