110 results about "Leaching rate" patented technology

The invention discloses a method for preparing a NaFeO2 material and leaching copper, zinc and molybdenum from copper slag, and relates to the technical field of metallurgical solid waste resource utilization. The method comprises the following steps: grinding the copper slag, mixing the ground copper slag with a sodium salt, roasting the mixture in a muffle furnace at a proper temperature, and finally carrying out ultrasonic washing and filtering on the roasted product to obtain filter residues and filtrate; and drying filter residues to obtain a high-purity NaFeO2 material, and recovering valuable metals such as copper, zinc and molybdenum from filtrate. In the washing process, valuable metal elements copper, zinc and molybdenum in the copper slag are efficiently leached into the solution, the leaching rate reaches 96% or above, and synchronous recovery of the valuable elements is achieved; according to the method, the industrial waste residue copper slag is successfully converted into the NaFeO2 product with the high additional value, meanwhile, valuable metal is efficiently extracted, the method has the advantages of being simple in process, low in cost, high in recycling degree and environmentally friendly, a new way is opened up for high-value utilization of the copper slag, and the method has good industrial application prospects.

The invention provides a method for preparing a poly-aluminum and functional silicon material by activating coal gasification slag and waste hydrochloric acid through microwave synergistic mechanical force, and belongs to the technical field of industrial solid waste recycling. The method comprises the following steps that the coal gasification slag is sequentially subjected to microwave radiation treatment and ball milling, activated slag and waste hydrochloric acid are subjected to an acid leaching reaction, and aluminum-iron-containing leachate and silicon-rich slag are obtained; extracting the aluminum-iron-containing leaching solution to obtain an iron-rich organic phase and a purified aluminum chloride solution; performing thermal polymerization reaction on the purified aluminum chloride solution to obtain polyaluminum chloride; the method comprises the following steps: carrying out alkaline leaching reaction on silicon-rich slag and waste alkali liquor, adding a structure-directing agent into a sodium silicate solution, and sequentially carrying out aging, solution pH value adjustment and crystallization precipitation to obtain mesoporous silica. According to the method, the aluminum-silicon leaching rate is remarkably increased through microwave-mechanical force synergistic activation, synergistic and efficient treatment of the three kinds of waste including the coal gasification slag, the waste hydrochloric acid and the waste alkali liquid is achieved, the technological process is closed, the product additional value is high, and the environmental and economic benefits are remarkable.

The invention discloses a multi-stage oxygen pressure leaching process for coarse-grained zinc sulfide concentrate, and belongs to the technical field of hydrometallurgy. The process comprises the following steps: carrying out first-stage high-temperature oxygen pressure leaching on 80-160-mesh coarse-grained zinc sulfide concentrate; the first-section leaching residues are subjected to flotation separation, and flotation concentrate and flotation tailings are obtained; and the flotation concentrate is finely ground and then subjected to second-stage low-temperature oxygen pressure leaching. Flotation operation is introduced between the first-stage oxygen pressure leaching and the second-stage oxygen pressure leaching, a large amount of gangue minerals and iron are effectively separated and opened, the amount of materials entering the second-stage leaching is remarkably reduced, and therefore the second-stage ore grinding load and leaching energy consumption are greatly reduced while the high leaching rate of zinc, indium, copper and the like is guaranteed, and the leaching efficiency is improved. And efficient, energy-saving and stable treatment of the coarse-grained zinc sulfide concentrate in a zinc hydrometallurgy system is realized.

The invention discloses a method for efficiently leaching and extracting germanium from germanium-containing zinc oxide smoke dust based on ultrasonic strengthening, and relates to the technical field of metal metallurgy, the method comprises the specific steps of raw material pretreatment, ultrasonic-assisted leaching, solid-liquid separation and zinc powder replacement germanium precipitation, germanium-enriched slag strengthened leaching and germanium enrichment and purification; according to the method, the ultrasonic leaching device is introduced, the leaching efficiency of germanium in the germanium-containing zinc oxide smoke dust is improved, passive films on the surfaces of smoke dust particles are effectively damaged through the action of the ultrasonic leaching device, permeation of a leaching agent into the particles is accelerated, and therefore efficient leaching of germanium is achieved within a short time, and meanwhile the leaching efficiency of germanium in the germanium-containing zinc oxide smoke dust is improved. According to the method, the leaching rate of germanium is increased by optimizing the proportion and leaching conditions of the mixed leaching agent, the germanium slag leaching solution is merged into the initial leaching solution, and a secondary enhanced leaching process of a subsequent zinc powder replacement germanium precipitation procedure is carried out, so that the maximum recovery of germanium resources is ensured, the overall resource utilization rate is increased, and the production cost is reduced.

The invention discloses an in-situ leaching liquid injection system and method for high-altitude ionic rare earth ore, and belongs to the field of rare earth hydrometallurgy. The system is composed of a liquid injection well pattern, a layered liquid injection device, a first liquid supply system, a second liquid supply system and a collection system. Exploring the thickness of an ore body weathering crust and vertical distribution of rare earth / impurities; the liquid injection hole is vertically divided into an upper layer liquid injection area (1 / 3-1 / 2 of the upper part) and a lower layer liquid injection area (1 / 2-2 / 3 of the lower part); a 1.0-1.4 wt% low-concentration diethylenetriamine-ammonium acetate composite leaching agent is injected into the upper layer, and co-leaching of impurities such as aluminum and iron is reduced; 1.5-2.5 wt% of high-concentration diethylenetriamine-ammonium acetate composite leaching agent is injected into the lower layer to ensure efficient leaching of rare earth; and rare earth-rich leaching liquid is collected. Compared with a traditional full-layer high-concentration process, the method has the advantages that the use amount of a leaching agent is reduced by 20-40% while the rare earth leaching rate is kept to be larger than or equal to 90%, the aluminum ion concentration of the leachate is reduced by 30-60%, the agent cost and the follow-up impurity removal load are remarkably reduced, and the method is particularly suitable for the high-altitude, low-temperature, low-air-pressure and thick-weathered crust environment.

The invention provides a roasting conversion method of ionic rare earth acid-soluble slag, which comprises the following steps: (1) mixing the ionic rare earth acid-soluble slag and an alkaline medium to ensure that the water content of the mixed material is 20-30%, and then granulating to obtain a granulated mixture; (2) loading the granulated mixture into a customized sagger, and carrying out a roasting reaction; (3) after the roasting reaction is finished, stripping the customized saggar from the clinker to obtain preparatory slag; and (4) sequentially carrying out water washing, acid leaching and solid-liquid separation on the preparatory slag to obtain rare earth-barium chloride-rich feed liquid and acid-soluble residues. According to the method, the process problem that the roasted clinker and the sagger are difficult to separate is effectively solved, the yield of the roasted clinker is high, the total weight reduction rate of the acid-soluble slag is high, and the barium leaching rate and the rare earth leaching rate are high; the dissipation of radioactive dust is reduced, and the industrial application prospect is good.

The application discloses a high-pressure leaching system and a high-pressure leaching method based on carbon dioxide and oxygen. The high-pressure leaching system comprises a carbon dioxide injection device, a high-pressure oxygen injection device and a high-pressure liquid injection device. The carbon dioxide injection device is connected with a liquid injection pipeline through a carbon dioxide gas conveying pipeline and a liquid carbon dioxide conveying pipeline. One end of the liquid injection pipeline is connected with a water storage tank, and the other end of the liquid injection pipeline is connected with an injection well. The other ends of the carbon dioxide gas conveying pipeline and the liquid carbon dioxide conveying pipeline are connected with a liquid carbon dioxide storage tank. The high-pressure oxygen injection device comprises a high-pressure oxygen conveying pipeline. One end of the high-pressure oxygen conveying pipeline is connected with a liquid oxygen storage tank, and the other end of the high-pressure oxygen conveying pipeline is connected with the injection well. The high-pressure injection of gaseous or liquid carbon dioxide increases the acidity of underground water, accelerates the dissolution of minerals and the complexation of uranium. The high-pressure injection of oxygen can quickly oxidize uranium-containing minerals and reducing substances, and improve the leaching rate of uranium.

The invention belongs to the technical field of waste residue resource utilization, and particularly relates to a method for improving the leaching rate of nickel and cobalt residues and the purity of leachate, and the method comprises the following steps: uniformly mixing the nickel and cobalt residues with concentrated sulfuric acid to obtain a roasting raw material; the nickel-cobalt slag is roasted under the continuous dynamic condition, and a roasted product is obtained; and the roasted product obtained in the previous step is mixed with industrial water and an additive for leaching, the pH value is adjusted, filtering is conducted, leaching residues and leaching liquid are obtained, and the content of iron impurities in the leaching liquid is low. According to the method, through sulfating oxidizing roasting and additive adding leaching, the content of nickel and cobalt elements in the leaching solution can be increased, the iron content in the solution can be reduced, the nickel and cobalt leaching rate and the purity of the leaching solution can be increased, and environmental pollution can be reduced.

The present application relates to the technical field of metal extraction, and particularly relates to a lithium extraction process for brown salt lake clay containing lithium-adsorbed ash. The lithium extraction process for brown salt lake clay containing lithium-adsorbed ash comprises the following steps: crushing and sieving the brown salt lake clay containing lithium-adsorbed ash, then immersing fine particles in a leaching agent, and filtering to obtain a leaching solution containing lithium elements; wherein the leaching agent is configured by low-mineralization water and concentrated sulfuric acid, the volume of the concentrated sulfuric acid is 5% to 20% of the volume of the leaching agent, and the low-mineralization water is natural water in Mahai Basin. The present application configures a composite leaching system by compounding low-mineralization water in a mining area with sulfuric acid, and through the triple synergistic effect of H + , SO4 2‑ and cations in low-mineralization water dissociated by sulfuric acid, the lithium leaching rate of 86.88% is achieved while the cost of the leaching agent is significantly reduced.

This invention discloses a method for extracting molybdenum from molybdenum oxide raw materials, comprising: mixing the molybdenum oxide raw materials with a certain proportion of leaching agent for leaching to obtain a first leaching solution for later use; removing impurities from the first leaching solution through resin or extractant to obtain a molybdenum-containing purified solution; adding a control agent to the molybdenum-containing purified solution to obtain a precursor solution; and placing the precursor solution in an autoclave for heating and decomposition to obtain the final product. The process of this invention can prepare molybdenum dioxide products in a short time, with simple steps and low economic cost, and avoids the introduction of ammonia nitrogen reagents throughout the process, thus preventing the generation of ammonia nitrogen waste pollutants. The molybdenum leaching rate during the leaching process and the molybdenum precipitation rate during the product preparation process of this invention exceed 99.5%.

The application relates to a method for leaching gallium from lime residue, which comprises the following steps: adding a composite alkali liquor into lime residue to obtain a slurry; wherein the components of the composite alkali liquor include alkali metal hydroxide and alkali metal carbonate; and heating the slurry to leach gallium and obtain a gallium-containing mixed slurry. The application improves the leaching rate of gallium by using a composite alkali liquor and a combined leaching process, and solves the technical problem of poor economic efficiency of the existing gallium leaching process from lime residue. Compared with the prior art, the method avoids the defects of high equipment requirement of the traditional alkali leaching process, and the shortcomings of large acid consumption of the acid leaching process, high content of impurity elements such as calcium in the leaching solution, and complex solution purification process.

The invention discloses a technology for improving the leaching rate of micro-fine particle wrapped gold based on microwave and oxidizing agent combined pretreatment, and belongs to the technical field of gold extraction metallurgy. The process comprises the steps of ore pulp pretreatment, concentration and pulp mixing, composite oxidizing agent adding, microwave pretreatment, cyanidation leaching and the like. According to the method, the microwaves and the composite oxidizing agent are utilized, a microfine particle gold wrapping carrier is efficiently destroyed, the leaching rate of gold is increased to 85-92% from 45-55% of a traditional method, meanwhile, energy consumption is reduced by 40% or above, sulfur dioxide emission is avoided, and the method has the advantages of being efficient, low in consumption, environmentally friendly and the like and is particularly suitable for extraction of arsenic-containing, sulfur-containing, carbon-containing and other microfine particle wrapping type refractory gold ores.

The invention relates to a utilization method of low-grade easily dissolvable stone type niobium concentrate, and belongs to the field of mineral processing and hydrometallurgy. The method solves at least one of the problems of low recovery rate of Fe and Nb elements, complex process flow, high energy consumption and cost, harsh reaction conditions, high environmental pollution risk and the like in the utilization of the low-grade easily dissolvable stone type niobium concentrate in the prior art. The invention relates to a utilization method of low-grade easily dissolvable stone type niobium concentrate, which comprises the following steps: uniformly mixing niobium concentrate with a reducing agent, pelletizing, and reducing and roasting to obtain roasted ore; the roasted ore is smashed and then subjected to magnetic separation, and iron ore concentrate and tailings are obtained; acidizing and roasting to obtain re-roasted ore; circulating grass leaching to obtain grass leaching liquid and grass leaching residues; the grass extract is subjected to extraction and back extraction through extraction resin, and niobium-containing back extraction liquid is obtained. According to the method, the leaching rate of niobium and the recovery rate of the iron element are increased, the technological process is simplified, the energy consumption and the production cost are reduced, and green and environment-friendly production is achieved.

The invention relates to the technical field of mineral processing, and particularly discloses a method for leaching beryllium from low-grade chrysoberyl type beryllium ore. According to the method for leaching beryllium from the low-grade chrysoberyl type beryllium ore, firstly, the silica-alumina ratio of chrysoberyl type flotation beryllium concentrate is regulated and controlled, then granulation is conducted, then low-temperature alkaline roasting is conducted, the roasting temperature is lower than the chrysoberyl melting temperature, leaching is conducted through a sulfuric acid solution after roasting, and beryllium-rich leaching liquid is obtained through separation. The method has the advantages of low roasting temperature and high beryllium leaching rate.

The invention discloses a method for efficiently recovering metal gallium from red mud, and belongs to the technical field of industrial waste resource utilization. The method comprises the five steps of red mud pretreatment, segmented leaching, leachate pretreatment, synergistic separation and enrichment and gallium preparation. Firstly, red mud mineral crystal lattices are damaged through mechanical activation, and release of gallium is enhanced; acid-alkali segmented leaching is adopted to improve the gallium leaching rate and inhibit impurity dissolution; neutralizing by lime milk and adsorbing and purifying the leachate by activated carbon; efficient enrichment of gallium is realized through composite extraction-ion exchange synergistic separation; and finally, high-purity refined gallium is obtained through oxalic acid precipitation, roasting, reduction and electrolytic refining. The total gallium leaching rate can reach 95% or above, the total recovery rate exceeds 91%, the product purity is larger than or equal to 99.99%, compared with a traditional technology, the reagent consumption is reduced by 30-40%, the dual purposes of red mud resource utilization and efficient gallium recovery are achieved, and the method has the advantages of being low in cost, good in environmental protection property, high in adaptability and the like and facilitates large-scale industrial application.

The application relates to a device and a method for treating laterite nickel ore by a sulfuric acid method, which comprises a horizontal reaction kettle, wherein the horizontal reaction kettle is provided with a horizontal reaction kettle body, a first feeding port, a first steam inlet and a first discharging port; and N vertical reaction kettles connected in parallel to the first discharging port, wherein each vertical reaction kettle is provided with a vertical reaction kettle body, a second feeding port, a second steam inlet and a second discharging port. The device can realize continuous acid treatment of the laterite nickel ore, and is helpful to improve the treatment efficiency. Moreover, the leaching effect is good, and the leaching rate of nickel and cobalt is up to 95 wt% or more. The obtained leaching solution has low acidity, which can effectively reduce the consumption of alkali or oxide required in subsequent neutralization treatment, and reduce the production amount of neutralization slag, is helpful to save the cost, and reduces the production amount of solid waste slag, is more green and environment-friendly.

The invention provides a method for efficiently recycling molybdenum in molybdenite ammonia leaching residues based on a composite leaching agent, and belongs to the technical field of molybdenum smelting and resource recycling. The method comprises the following steps that firstly, the molybdenite ammonia leaching residues are ground, and an oxidizing agent is added for pre-activation at the room temperature; then a NaOH aqueous solution and a Na2CO3 aqueous solution are sequentially used for two-stage normal-pressure alkaline leaching, wherein H2O2, NaOH and Na2CO3 form a composite leaching agent; and finally, filtering to obtain molybdenum-containing leaching liquid and low-molybdenum leaching residues. According to the method, through the synergistic effect of the composite leaching agent, H2O2 oxidizes low-valence molybdenum and MoS2 to generate a soluble state, Na2CO3 replaces insoluble molybdate, NaOH maintains high pH to inhibit molybdic acid precipitation, deep recovery of insoluble molybdenum is achieved, high-pressure equipment is not needed, energy consumption and equipment cost are low, H2O2 is clean and free of corrosion, the impurity leaching rate is low, adaptability to different sources, high-calcium type and other difficult-to-treat ammonia leaching residues is high, and the method is suitable for industrial production. The operation is simple.

The application provides a sandstone uranium mine gas-liquid alternating leaching method, which comprises the following steps: S1, injecting a leaching agent into a core column filled with a naturally broken sample until the leaching agent fills the core column; S2, injecting oxygen into the core column, raising the pressure in the core column to a first target pressure P1 and maintaining the pressure until a first target time, so that the sample reacts under the action of the leaching agent containing dissolved oxygen to form a reaction solution; S3, transferring the reaction solution in the core column to the intermediate container; the application has the beneficial effect that the sample in the core column is subjected to gas-liquid alternating leaching, the oxygen in the leaching liquid reacts with the sample to alternately change into an oxygen-rich gaseous state, so that the mineral is in a wetted state, the surface liquid film layer is thinned, the diffusion of oxygen at the gas-liquid interface is facilitated, the oxidation rate is accelerated, when the liquid film surface and the ion concentration difference in the leaching agent are converted into an oxygen-rich liquid state again, the hydrodynamic dispersion process is accelerated, and thus the leaching rate is improved.

The invention belongs to the field of hydrometallurgy, and particularly relates to a weathering crust illuviation type rare earth ore screening system and a layered and graded rare earth heap leaching method. The system comprises a feeding device, a screening device, a conveying device, an ore heap, a liquid preparing pool and a liquid collecting pool which are sequentially arranged, and a cofferdam is arranged at the top of the ore heap. The method comprises the following steps: 1) after an ore heap is arranged by using weathering crust elution-deposited rare earth ore, spraying a composite ammonium solution in a solution preparation pool to the top of the ore heap through a spraying pipeline, and maintaining the liquid level height in a cofferdam at 5-10cm; (2) after the composite ammonium solution is sprayed, clear water is sprayed to the top of the ore heap through a spraying pipeline, water-soluble ammonium in the ore heap is flushed out, and the rare earth dump leaching process.By means of the method, the dump leaching efficiency of the weathering crust elution-deposited rare earth ore can be effectively improved, the ore leaching period is shortened, the rare earth leaching rate is increased, and the consumption of a leaching agent in the dump leaching process is reduced.

The application discloses a kind of high-strength environment-friendly phosphogypsum nanometer geopolymer aggregate and preparation method thereof, belong to solid waste recycling technical field.The phosphogypsum nanometer geopolymer aggregate is when using the combination system of " phosphogypsum-basic activator-nano reinforcing agent", wherein the basic activator used is Portland cement, and Ca (OH) 2 produced by hydration can provide alkaline environment;The nano reinforcing agent used is nano silicon aluminum material, which has extremely high surface activity, can effectively promote the reaction process of geopolymer and improve the microstructure;At the same time, a large amount of phosphogypsum is combined, which further guarantees the solid waste utilization of phosphogypsum, improves the utilization rate and reduces the cost.In the preparation method, phosphogypsum is used as the main raw material, the process is simple, the energy consumption is low, sintering is not needed, the cylinder compression strength of the obtained aggregate is high, it is friendly to the environment, the phosphorus and fluorine leaching rate is extremely low, and the bulk high-value utilization of phosphogypsum can be realized.

The application provides a method for recovering chlorinated rare earth from rare earth materials, and belongs to the technical field of rare earth hydrometallurgy. The method comprises the following steps: uniformly mixing the rare earth materials with a calcium-containing compound and carbon powder, heating, and reacting in a molten state to obtain roasted ore; crushing and grinding the roasted ore, uniformly mixing the roasted ore with water, and then adding hydrochloric acid to perform reaction 2; after the reaction 2 is completed, solid-liquid separation is performed to obtain a chlorinated rare earth solution and a leaching residue; and the temperature of the reaction 1 is 1500 DEG C-2000 DEG C, and the time is 0.5-2h. In the method, the rare earth materials do not need to be pretreated by grinding and sieving, and can directly react with the calcium-containing compound and the carbon powder, so that the process flow is short. The rare earth decomposition rate of the slag is above 98%, the rare earth leaching rate is above 96%, and the recycling and utilization of the rare earth resources are effectively realized.

The invention relates to talaromyces pseudomonas hzt-3'as well as a preparation method and application of the talaromyces pseudomonas hzt-3 ', and belongs to the technical field of application of microorganisms. The strain is preserved in the China Center for Type Culture Collection, the preservation number of the strain is CCTCC NO: M 20251797, and the strain is classified and named as (Talaromyces pseudomonas hzt-3 '). The method comprises the following steps: collecting moss and vegetation soil samples from basalt, diabase and dolomite; diluting bacterial colonies in the sample, and separating and purifying the bacterial strains by using a Czapek culture medium; anorthite and serpentine are used as inorganic salt sources for strain screening, and strains which grow stably and have a good leaching effect on calcium magnesium silicate minerals are obtained; the strain is applied to efficient leaching of anorthite, serpentine and wollastonite, and compared with a sterile control group, the effect of improving the leaching rate of calcium and magnesium ions is remarkable. The method solves the problem that the reaction rate of mineral sequestration carbon dioxide is slow due to the fact that ions in natural silicate minerals are difficult to leach, and has great significance.

The invention provides a laboratory column leaching method, and belongs to the technical field of hydrometallurgy. According to the method, interference of fine-grained materials and coarse-grained gold on leaching is effectively eliminated through rigorous particle size separation and pretreatment steps, and the effect that the fine-grained materials are stacked and covered on the surface of deep leached ore along with a leaching agent in the simulated dump leaching process and the pressure borne by the deep ore are combined, so that the leaching efficiency of the deep leached ore is improved. The physical and chemical conditions of the deep ore in the dump leaching process are further simulated, the industrial dump leaching conditions are more truly reduced, the actual leaching rate of elements to be recycled in the ore in the actual dump leaching process is accurately evaluated, production is guided, and scientific data support is provided.

This invention relates to the field of automatic control technology for rare earth mining, specifically disclosing an intelligent control system and method for in-situ leaching of rare earth minerals based on digital twins. The system collects real-time data on groundwater level, leaching agent concentration, mother liquor flow rate, and spatial geological data; calculates the leaching state vector field based on seepage mechanics and ion exchange constitutive relations; corrects the optimal injection template based on this vector field, generating dynamic injection volume distribution maps and dynamic injection concentration distribution maps; performs deviation analysis on actual injection parameters, outputting a binary map of leaching anomaly areas; spatially overlays this binary map with grade distribution maps and permeability zoning maps, analyzing the topological relationship between the injection anomaly areas and high-grade and low-permeability areas; judges the risk of leaching rate decline or leakage based on the topological relationship, generating solenoid valve opening commands and variable frequency pump speed commands for each injection well, achieving precise addition of leaching agent; this invention can improve rare earth recovery rate and reduce environmental pollution caused by leaching agent leakage.

The invention relates to the technical field of lithium smelting gold, in particular to a leaching residue recycling device which comprises a stirring container, and a stirring assembly is arranged in the stirring container; the stirring assembly comprises a base and a controller, the top of the base is rotationally matched with a stirring tank, and the side wall of the stirring tank is sleeved with a worm wheel; an L-shaped connecting rod is fixedly connected to the top of the base; a feeding pipe is fixedly connected to the bottom of the transverse end of the L-shaped connecting rod; supporting rods are symmetrically and fixedly connected to the top of the base, a worm is rotationally matched between every two adjacent supporting rods, and the worms are meshed with the worm wheels. A U-shaped stirring rod is arranged in the stirring tank, one end of the U-shaped stirring rod is fixedly connected with an auxiliary stirring rod, and a driving assembly used for driving the U-shaped stirring rod to stir materials in the stirring tank in an up-down layered mode is arranged on the base. The driving assembly is used for driving the worm to rotate. The stirring assembly can stir an upper-layer solution and a lower-layer slag body in the stirring tank in a full-area covering mode, the contact rate of leaching slag particles and a leaching agent is increased, and then the leaching rate of lithium ions is increased.

The invention discloses a method for preparing a vanadium-containing solution from vanadium-containing smelting slag. The method for preparing the vanadium-containing solution from the vanadium-containing smelting slag comprises the steps that the vanadium-containing smelting slag and a calcium compound are mixed and roasted, and a calcium roasting product is obtained; leaching the calcified roasting product by adopting a hydrochloric acid solution to obtain an acid leaching solution; an oxidizing agent is added into the acid leaching solution for oxidation, and a pentavalent vanadium solution of an acid chloride system is obtained; extracting pentavalent vanadium by adopting an amide extraction solvent to obtain a vanadium-containing loaded organic phase; then washing the vanadium-containing loaded organic phase to obtain a washed vanadium-containing loaded organic phase; and the washed vanadium-containing loaded organic phase is subjected to back extraction through a back extraction agent, and a vanadium-containing solution is obtained. According to the method, the vanadium-containing smelting slag which is low in grade and difficult to use is subjected to the calcification roasting-acid leaching and solvent extraction coupling technology, the high-purity vanadium-containing solution is obtained, efficient utilization of resources is achieved, and the method has the advantages of being high in leaching rate, high in leaching speed, good in extraction selectivity, economical, environmentally friendly and the like.

The application provides a method for strengthening leaching of ionic rare earth, which is based on regulation of ZETA potential and seepage rate of clay mineral by cation and anion coordination adsorption to improve leaching efficiency of ionic rare earth, and comprises the following steps: providing ionic rare earth ore, citrate solution and non-ammonium inorganic salt solution, wherein the liquid-solid ratio of the citrate solution to the ionic rare earth ore is 0.1-0.5:1, and the liquid-solid ratio of the non-ammonium inorganic salt solution to the ionic rare earth ore is 0.9-0.5:1; using the citrate solution to perform first leaching treatment on the ionic rare earth ore to obtain first leaching solution; using the non-ammonium inorganic salt solution to perform second leaching treatment on the ionic rare earth ore to obtain second leaching solution; performing first post-processing treatment on the first leaching solution to obtain rare earth; and performing second post-processing treatment on the second leaching solution to obtain rare earth. The method for leaching ionic rare earth has the advantage of high leaching rate.

This invention belongs to the field of metallurgical solid waste resource utilization technology, specifically disclosing an iron-based additive, its preparation method, and its application. The preparation method includes: mixing red mud, sodium salt, and a reducing agent; subjecting the mixture to reduction roasting to obtain reduced clinker; grinding and separating the reduced clinker by magnetic separation to obtain iron concentrate, thus obtaining the iron-based additive. This invention uses red mud, sodium salt, and a reducing agent stored in alumina plants as raw materials. The sodium salt significantly lowers the reduction temperature of iron ore, and by controlling the temperature and the amount of reducing agent added, the hematite is partially or completely reduced. The resulting iron-based additive is returned to the Bayer process leaching, which can significantly improve the alumina leaching rate. Simultaneously, the titanium minerals in the obtained titanium-containing tailings exist in a specific phase or in the form of amorphous sodium titanate, exhibiting higher reactivity. This invention realizes the recycling and value-added utilization of solid wastes such as red mud, and has good application prospects.

This invention relates to the fields of industrial automation and environmental protection technology, and in particular to a purification treatment method for sludge brick making. The method involves collecting real-time composition data of the sludge to be treated using an online component detection device installed in the sludge purification system, generating a sludge composition dataset; collecting real-time status feedback data from key process nodes of the system, forming a process status dataset; based on this dataset, using the compressive strength of the finished brick, energy consumption, and heavy metal leaching rate as constraints, generating an optimized process parameter set through multi-variable collaborative optimization; dynamically adjusting the execution unit's operating instructions accordingly, generating a process control instruction set; and finally combining the two datasets to drive relevant devices to perform adaptive purification treatment, recording data to generate a control log dataset. This invention achieves deep collaboration between component detection, parameter optimization, and process execution, effectively adapting to fluctuations in sludge composition, and improving the purification efficiency, finished product quality, and resource utilization efficiency of sludge brick making.

This invention discloses a vanadium extraction process for shale coal through composite salt roasting and leaching, relating to the fields of mineral processing and metallurgy. The invention includes the following steps: Step 1: Crushing vanadium-bearing shale coal ore to below 3mm, preheating at 350℃ for 30min, roasting at 650~700℃ for oxidative decarburization for 40~60min, then cooling and grinding to a particle size less than 0.07mm to obtain decarburized powder. The flue gas generated during roasting is used for preheating the vanadium-bearing shale coal ore after dust removal. Step 2: Mixing the decarburized powder from Step 1 with composite additives in a certain proportion and placing it in a disc granulator for pelletizing. This invention reduces the emission of harmful gases during shale coal roasting by employing a decarburization followed by oxidative roasting process, using sodium sulfate instead of chlorine-containing roasting agents, and improving the vanadium conversion rate by adding steel slag powder and manganese dioxide to catalyze the oxidation of low-valent vanadium. The resulting vanadium-bearing leachate contains fewer impurity ions and has a high water leaching rate; it also has good industrial feasibility and is easy to promote on a large scale.