257 results about "Laterite" patented technology

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

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

The invention provides a laterite-nickel ore 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 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 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.

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 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.

This disclosure relates to a method for removing iron and manganese ions from lateritic nickel ore acid leaching solutions using pyrite, belonging to the field of hydrometallurgical technology. The method includes: adding pretreated pyrite and a weak alkali compound to the lateritic nickel ore acid leaching solution and mixing to obtain a mixed solution; then introducing air into the mixed solution and stirring to obtain a stirred mixed solution. The removal method of this disclosure utilizes the reducing properties of pyrite and the variable valence precipitation characteristics of iron and manganese ions in the acid leaching solution, combined with the oxidizing effect of oxygen in the air, thereby achieving effective precipitation of iron and manganese ions.

The invention provides a multi-stage combined leaching method for ultra-low grade laterite nickel ore, including: firstly, the raw laterite nickel ore slurry is treated by high pressure acid leaching to obtain the high pressure leaching tailings containing iron, aluminum and magnesium and the high pressure leaching solution containing nickel, cobalt and manganese. The mass percentage of nickel in the raw laterite nickel ore is less than 1.0%; Secondly, the high pressure leaching solution, laterite nickel ore slurry and acid solution were mixed to obtain the mixed solution, and the mixed solution was subjected to multi-stage atmospheric pressure leaching treatment, after concentration treatment, the final concentrated atmospheric pressure leaching solution and the final concentrated atmospheric pressure leaching slurry with the same concentration as the raw laterite nickel ore slurry. Finally, the final concentrated atmospheric pressure leaching solution and high pressure leaching tail residue were successively recycled leaching, multi-stage pre-neutralization, counter-current decantation washing, Fe / Al / Cr removal and MHP precipitation to obtain nickel and cobalt hydroxide products. the invention can effectively restrain the scaling rate of conventional high pressure acid leaching treatment and prolong the production cycle.

The invention discloses a method for recovering nickel and cobalt from laterite-nickel ore. The method sequentially comprises the steps of ore grinding, pre-neutralization, synergistic pressure acid leaching, iron and aluminum removal and nickel and cobalt precipitation. According to the method, acid and heat in the pyrite reaction process are fully utilized through the steps of pre-neutralization, leaching and the like according to the characteristics of the laterite-nickel ore and the pyrite, so that a steam heat source is greatly reduced (40%-80% of the steam heat source is saved), the use amount of sulfuric acid is reduced (80%-99% of the sulfuric acid is saved), and the resource utilization rate of the iron slag is increased (the iron content is larger than 60%, and the iron slag can be directly used as an ironmaking raw material).

This application belongs to the field of water quality testing technology, specifically relating to a method for testing ammonia nitrogen in wastewater from the hydrometallurgical process of laterite nickel ore. The method includes the following steps: adding sodium thiosulfate and zinc sulfate to the wastewater, adjusting the pH with a boric acid-sodium hydroxide buffer solution to pH 9.5, and allowing the solution to stand; filtering, taking an appropriate amount of filtrate into a colorimetric tube, and adjusting the volume, then adding potassium sodium tartrate and Nessler's reagent, mixing well, and allowing it to stand; measuring the absorbance, and calculating the ammonia nitrogen concentration in the wastewater based on the absorbance. This method can effectively eliminate the interference from high sulfate content and metal ions in high-sulfate industrial wastewater. The resulting colorimetric system is highly stable and has the advantages of being simple to operate and providing reliable results. It holds significant importance for the testing and treatment of wastewater from the hydrometallurgical process of laterite nickel ore.

The application discloses a method for detecting the content of chromium in laterite nickel ore, and comprises the following steps: S1, nitric acid, phosphoric acid, perchloric acid and sulfuric acid are sequentially added into a to-be-detected sample of the laterite nickel ore, and the mixture is uniformly mixed to obtain a mixed solution A; S2, when the amount of the nitric acid is not 0, the mixed solution A is heated to remove water and the nitric acid, and then is heated again to remove the perchloric acid, so as to obtain a mixed solution C; when the amount of the nitric acid is 0, the mixed solution A is directly heated to remove water and the perchloric acid, so as to obtain the mixed solution C; S3, after the mixed solution C is cooled, water is added to dilute the mixed solution C, the mixed solution C is boiled again to dissolve salts, and after being cooled, the mixed solution C is filtered and diluted for standby, and is recorded as a mixed solution D; and S4, the mixed solution D is determined by ICP, and the content of the chromium in the laterite nickel ore is calculated. By means of the oxidation-reduction reaction of the nitric acid, the phosphoric acid, the perchloric acid and the sulfuric acid, and the determination by ICP, the problems of few test analysis methods, long detection time and complicated steps in the hydrometallurgy of the laterite nickel ore are solved.

The technical scheme of the present application provides a preparation device for a laterite nickel ore acid leaching solution neutralizer, comprising a preparation part, a buffer part and a partition part. The preparation part is used for mixing and preparing limestone slurry. The buffer part is used for storing the prepared limestone slurry. The partition part is connected to the preparation part at one end and to the buffer part at the other end, and is used for continuously outputting the slurry from the preparation part in a segmented manner into the buffer part, and for impacting the previously stored slurry from all directions by the subsequently injected slurry. The prepared limestone slurry from the preparation part is injected into the buffer part in a segmented manner through the partition part, and the subsequently injected slurry impacts the previously stored slurry from all directions. The segmented injection forms an impact on the already accumulated limestone slurry, avoids excessive precipitation of the limestone slurry caused by long-term standing, guarantees the quality of the limestone slurry stored in the buffer part, and stabilizes the performance of the limestone slurry as a neutralizer.

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.

A dynamic optimization method for acid-to-ore ratio in high-pressure leaching of laterite nickel ore includes: obtaining a feed ore composition, a pulp concentration, a pulp flow rate, a leaching temperature and a pulp duration time in an autoclave, and setting a target leaching rate of nickel; setting a flow rate of sulfuric acid; obtaining a relationship between a hydrogen ion concentration in a solution and a reaction time; obtaining a theoretical leaching rate of nickel when a leaching time reaches the pulp duration time in the autoclave; comparing the theoretical leaching rate of nickel with the target leaching rate of nickel; adjusting the set flow rate of the sulfuric acid until the theoretical leaching rate of nickel is equal to the target leaching rate of nickel, calculating a corresponding optimal acid-to-ore ratio; and adjusting an opening degree of a sulfuric acid flow regulating valve of the autoclave.

The present application relates to a kind of laterite nickel ore metallurgical slag resource recycling method, by sequentially carrying out alkali leaching treatment and acid leaching treatment to laterite nickel ore metallurgical slag to remove impurities, further the biomass is carbonized and activated to obtain the biomass reducing agent with enhanced reducing property, which is beneficial to further improve the recovery effect of iron, and the cost of the biomass reducing agent is relatively low, while improving the utilization rate of biomass;Continue to mix the biomass reducing agent with acid leaching residue, and then carry out reduction roasting and magnetic separation, thereby obtaining high-purity and high-yield iron concentrate, and simultaneously recovering by-product sodium sulfate product and calcium chloride product, greatly improving the resource utilization rate of laterite nickel ore metallurgical slag.

The application provides a recycling method of laterite nickel ore hydrometallurgy wastewater, which comprises the following steps: the laterite nickel ore is sequentially subjected to high-pressure acid leaching, cyclic leaching, CCD washing, iron and aluminum removal treatment, MHP precipitation treatment and manganese precipitation treatment to obtain post-manganese precipitation wastewater; the post-manganese precipitation wastewater is subjected to ion exchange to obtain post-ion exchange liquid and nickel and cobalt enriched solution; the nickel and cobalt enriched solution is recycled to the CCD washing; the post-ion exchange liquid is subjected to magnesium separation to obtain magnesium rich liquid and magnesium poor liquid; the magnesium rich liquid is recycled to the MHP precipitation treatment, and / or the magnesium rich liquid is subjected to crystallization to obtain magnesium sulfate product; the magnesium poor liquid is subjected to bipolar membrane electrolysis to obtain sodium hydroxide solution and sulfuric acid solution; the sodium hydroxide solution is recycled to the iron and aluminum removal treatment, and the sulfuric acid solution is recycled to the cyclic leaching. The application can realize full utilization of wastewater resources, is green, environmentally friendly and economical, and has wide application prospect.

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 discloses a waste thickening equipment for laterite nickel ore hydrometallurgical wastewater, which includes a buffering device, a flocculation device, and a thickening device. The influent end of the flocculation device is connected to the buffering device, and the effluent end of the flocculation device is connected to the thickening device. The thickening device comprises a thickener, an overflow discharge structure, and an inclined plate sedimentation structure. The thickener is in communication with the flocculation device. The overflow discharge structure is fixed above the thickener and is used to discharge the supernatant liquid from the thickener. The inclined plate sedimentation structure is fixed below the overflow discharge structure and is used to promote the sedimentation of particulate matter in the thickener. The inclined plate sedimentation structure facilitates the sedimentation of particulate matter in the thickener, preventing the particles from entering above the inclined plate sedimentation structure. The overflow discharge structure guides the supernatant liquid from the thickener, and the inclined plate sedimentation structure of this application can guide the sedimentation of particles, thereby significantly reducing the flocculent particles in the overflow liquid and improving the thickening effect.

The application relates to a high-pressure leaching flash tank for laterite nickel ore, which comprises a tank body, a buffer assembly and a stirring assembly. The upper end of the tank body is provided with a steam outlet, the lower end is provided with a liquid discharge port, and the side part is provided with a liquid inlet. The buffer assembly comprises a shell, a rotating shaft and an impeller. The shell is arranged in the tank body, the shell is provided with a cavity, an inlet and an outlet which are connected with the cavity, the outlet is located at the bottom of the shell, the inlet is connected with the liquid inlet, the upper end of the rotating shaft is rotatably arranged in the cavity and the lower end of the rotating shaft extends out of the cavity from the outlet, the impeller is located in the cavity and connected with the upper end of the rotating shaft, and the stirring assembly is arranged at the lower end of the rotating shaft and used for extending into the slurry. The buffer assembly and the stirring assembly can avoid the erosion and abrasion of the tank body caused by high-speed slurry, and the high-speed liquid flow can be used to stir the bottom slurry.