247 results about "Leaching rate" patented technology

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a pretreatment method for enhancing peroxide to improve the leaching rate of high-sulfur-arsenic gold ore. Comprising the following steps that the high-sulfur-arsenic gold ore is ground and then prepared into ore pulp; an oxidizing agent is added into the ore pulp, oxidation pretreatment is conducted on the high-sulfur-arsenic gold ore under the catalytic action of ultraviolet light, and ore pulp activation liquid is formed; and the pH of the ore pulp activating solution is adjusted to 9-12, a gold leaching agent is added into the ore pulp complexing solution, and stirring gold leaching treatment is conducted. According to the method, efficient oxidation of sulfide and arsenide is achieved under the mild condition through the synergistic effect of photocatalysis and chemical oxidation, the leaching rate of gold is remarkably increased, compared with a conventional peroxide oxidation method for pretreatment, the leaching rate can be increased by 10%-35%, and meanwhile the agent use amount and environmental pollution are reduced.

The invention provides a method and equipment for leaching and recycling an aluminum electrolysis waste carbon cathode. The method relates to the field of solid waste treatment, and comprises the following steps: S1, crushing the recycled waste aluminum electrolysis waste carbon cathode by using a jaw crusher, further finely grinding to a certain mesh number by using a vibration mill, and drying for later use; s2, the ground waste carbon cathode is weighed, a certain amount of water is added, the mixture is placed in an ultrasonic instrument at the normal temperature to react for a period of time, and washing residues and washing liquid are obtained through filtering; s3, a sodium hydroxide solution with a certain concentration is added into the washing residues to be mixed, and the mixture is placed in an ultrasonic instrument to react for a period of time at a certain temperature. Compared with a traditional leaching method, the method has the advantages of being high in efficiency and good in effect, the leaching rate of valuable substances is greatly increased, and the valuable substances are recycled through a series of steps such as washing, alkaline leaching, acid leaching and recycling. The method realizes efficient recovery of useful components in the waste carbon cathode, does not produce solid waste and wastewater in the process, is environment-friendly, and realizes effective utilization of resources and harmless treatment of dangerous solid wastes.

The invention relates to an efficient copper removal and recycling process for copper-cyanogen complex wastewater, which comprises the following steps: (1) critical acidification-selective crystallization of the copper-cyanogen complex wastewater: directionally recombining a copper-cyanogen complex to generate insoluble CuCN crystals by accurately regulating and controlling the pH value of the wastewater; (2) rotational flow enhanced crystallization: separating CuCN crystals from overflow liquid through a hydrocyclone; (3) gradient activation of a composite vulcanizing agent for deep copper removal: enabling the fine CuCN particles and the dissolved-state low-coordination copper-cyanogen complex to react to generate insoluble CuS crystals by adjusting the pH value and adding the composite vulcanizing agent; and (4) magnetic seed enhanced separation: carrying out magnetic separation by adopting modified magnetic seeds and a low-intensity magnetic separator, separating CuS magnetic flocs from the wastewater, and finally obtaining purified tail liquid. According to the closed-loop process, copper in the copper-cyanogen complex wastewater can be efficiently removed and recovered, the purified tail liquid can be reused for cyanidation leaching operation, the unit consumption of sodium cyanide is remarkably reduced, the leaching rate of gold and silver is increased, and zero discharge of wastewater and full recovery of copper resources are truly achieved.

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 present invention relates to a method for decomposing and utilizing phosphate-potassium ore, belonging to the technical field of phosphate-potassium ore treatment. The technical problem solved by the present invention is to provide a method for decomposing and utilizing phosphate-potassium ore. The method comprises the following steps: mixing nitric acid and phosphate-potassium ore, and carrying out an acidolysis reaction; after the reaction is completed, performing solid-liquid separation to obtain a phosphorus-containing filtrate and potassium-containing acid-insoluble substances; wherein, the leaching rate of potassium in the phosphate-potassium ore is ≤3%, and the leaching rate of phosphorus is ≥96%. The present invention for the first time uses nitric acid to treat phosphate-potassium ore, controls the reaction conditions of the acidolysis process to reduce the leaching rate of K element, realizes the separation of phosphorus and potassium elements, avoids the problem that potassium fluorosilicate precipitates and clogs the filter cloth during vacuum filtration and cooling, perfectly avoids the disadvantages of the traditional wet-process phosphoric acid for treating phosphate-potassium ore, and has rich products.

The present invention provides a remediation composition for soil contaminated with hexavalent chromium and a soil remediation method. The composition comprises catechin, flavonoid isorhamnetin and humic acid with a mass ratio of 1:1 - 3:0.1 - 1. The remediation composition for soil contaminated with hexavalent chromium according to the present invention can achieve a leaching rate of 93% for the hexavalent chromium contamination in the soil. At the same time, the composition can reduce more than 95% of the hexavalent chromium in the leaching solution to trivalent chromium with low toxicity, achieving the purpose of completely removing hexavalent chromium from the soil and greatly reducing the material cost of chemical leaching.

The invention relates to a method for curing harmful components in hazardous wastes, which comprises the following steps: uniformly mixing high-silicon iron tailings and blast furnace fly ash, adding the mixed material into chromium-containing waste liquid, stirring, carrying out plate-frame pressure filtration, carrying out pressure filtration again to obtain a mixed material, cutting the mixed material into blocks, drying the cut mixed material, and roasting after treatment to obtain a roasted product; carrying out rapid water cooling on the roasted product, and grinding after water cooling; and performing magnetic separation on the grinding product to obtain iron ore concentrate containing ferrochrome spinel and low-chromium tailings. According to the method, solid waste high-silicon iron tailings and blast furnace fly ash generated by iron and steel enterprises are used as curing agents, curing of heavy metal chromium in the chromium-containing sludge is achieved, the leaching rate of hexavalent chromium and total chromium in the obtained product is far lower than the standard limit value, harmless treatment of the chromium-containing sludge can be achieved, and the method is suitable for industrial production. The obtained ferrochrome spinel can be recovered through magnetic separation, and the generated low-chromium tailings can be directly subjected to landfill treatment or used as building materials.

A preparation method of an ionic rare earth leaching agent includes the following steps: (1) domestication microorganisms with rare earth activated mineral powder culture medium to obtain a microbial suspension; (2) amplifying and culturing the microbial suspension and additives to obtain the amplified culture medium; and (3) mixing the modified sesbania gum with the amplified culture medium to obtain the ionic rare earth leaching agent. The activated mineral powder is the active metal-containing mineral powder in nature, which has excellent cation exchange function after activation, and the activated mineral powder and ionic rare earth mineral powder are used as the medium components to domesticate microorganisms, so that microorganisms can survive in the above-mentioned ionic solution and improve the leaching rate of synergistic leaching ionic rare earth.

The invention discloses a method for enhancing biological leaching of copper in a waste circuit board by utilizing magnetite. The method comprises the following steps: adding the pre-crushed waste circuit board and magnetite into a 9K culture medium with the pH value of 1.8-2.0 according to a certain mass ratio, inoculating Acidithiobacillus ferrooxidans as a leaching strain, and carrying out a leaching reaction under a constant-temperature oscillation condition. The magnetite is added, so that the leaching of copper in the circuit board is remarkably enhanced, the leaching rate is remarkably improved, and the leaching period is shortened. And compared with the microbiological leaching result without magnetite, the copper leaching rate is improved by 12-32%. By utilizing the difference between the circuit board and the magnetite in particle size, the magnetite can be recycled from the leaching residues through a physical separation means for a new round of leaching. The method is simple in process, the strain is easy to culture, and the method has good environmental friendliness and is suitable for green and efficient recovery of copper in the waste circuit board.

The invention discloses a method and a system for improving heap leaching efficiency of metal ore by using micro-nano bubbles, which comprise the following steps: a) generating the micro-nano bubbles: installing a micro-reactor on a leachate conveying pipeline, introducing oxygen or air, and enabling the leachate to pass through the micro-reactor under a certain pressure to generate a leachate containing the micro-nano bubbles; b) conveying the gas-containing leachate: conveying the leachate containing the micro-nano bubbles to an ore dump leaching area, and enabling the leachate to be in full contact with the ore in the dump leaching process; and c) reinforcement of the dump leaching process: promoting leachate to permeate into fine gaps of ore particles by utilizing high permeability and high mass transfer characteristics of the micro-nano bubbles, enhancing the oxidation reaction and improving the leaching rate of metal. According to the method, the metal leaching rate is remarkably increased, the leaching time is shortened, the agent consumption is reduced, and remarkable economic benefits and environmental benefits are achieved.

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.

Disclosed in the present invention is a method for continuously leaching an ionic rare earth ore. The method comprises: putting an ionic rare earth ore and a leaching agent solution to a multi-stage leaching reactor for co-current leaching, and carrying out solid-liquid separation to obtain a rare earth leachate and leached tailings; putting the leached tailings and clear water into a multi-stage elution reactor for co-current elution, and carrying out classification and solid-liquid separation to respectively obtain coarse-sized tailings, medium-sized tailings, fine-sized tailings, and an eluate; and enriching the rare earth leachate and / or the eluate, and then circulating same to prepare the leaching agent solution, wherein the rare earth leachate flows back to the multi-stage leaching reactor, and the eluate flows back to the multi-stage elution reactor. By means of the continuous multi-stage co-current leaching with the leaching agent solution and the backflow of the rare earth leachate for leaching, and the continuous multi-stage co-current elution with clear water and the backflow of the eluate for elution, the rare earth leaching rate and the rare earth concentration in the leachate are effectively improved, the consumption of the leaching agent is greatly reduced, the ore leaching period is significantly shortened, and full-process water balance and tailing classification and comprehensive utilization are achieved.

The invention discloses a method for leaching valuable elements in silicate rare earth ore, and belongs to the technical field of rare earth metallurgy. According to the method, the valuable elements in the rare earth concentrate are efficiently leached by adopting the processes of low-temperature sulfating intensified roasting, clinker hydrometallurgy, leached ore pulp flocculation and filter cake washing. The strengthened low-temperature sulfating roasting process avoids the problems of high energy consumption, serious equipment corrosion, low rare earth leaching rate and complex waste gas treatment (SO2 escape) of a traditional process, meanwhile, silicate rare earth ore decomposition is achieved, the effect of a back-end leaching process is remarkably improved, compared with an acid pickling process, the hydrometallurgy process reduces the acid consumption and the wastewater treatment difficulty, and the production cost is reduced. The leaching ore pulp flocculating settling process is beneficial for improving the industrial production efficiency, the filter cake washing process is beneficial for further improving the leaching rate of valuable elements, the silicate rare earth ore concentrate resources are utilized to the maximum extent on the premise of being environmentally friendly, and a technical path is provided for industrial utilization of silicate type rare earth ore.

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 provides a method for treating clay type lithium ore through multi-composite-field medium-low-temperature roasting and continuous water leaching, and belongs to the technical field of mineral processing. According to the method, multi-field roasting and continuous leaching processes are adopted for treatment, a microwave-suspension composite roasting device is adopted for multi-field roasting, and a plurality of continuous leaching devices are adopted for continuous leaching. The method provided by the invention has the advantages of simple process flow, high roasting efficiency and low energy consumption, and can effectively destroy mineral lattices of the clay type lithium ore; in addition, by means of the continuous leaching technological process, the lithium extraction rate is greatly increased, the lithium leaching rate is increased, the use amount of an acid leaching agent is reduced, sulfuric acid is recycled, the water demand is reduced, the problem of lithium resource shortage is solved, and a theoretical basis is provided for subsequent industrial production.

The invention provides a method for leaching germanium from germanium-containing coal ash, and belongs to the technical field of germanium separation. The method comprises the following steps: (1) mixing germanium-containing coal ash and an alkali solution in a first-stage reaction kettle for stirring reaction to obtain alkaline leaching ore pulp; (2) adding mixed acid into the alkaline leaching ore pulp, stirring, and carrying out mixed acid leaching on the alkaline leaching ore pulp in a secondary reaction kettle to obtain acid leaching ore pulp; and (3) carrying out liquid-solid separation on the acid leaching ore pulp to obtain slag of which the main component is silicon dioxide and leaching liquid rich in germanium. According to the method disclosed by the invention, an alkali fusion process is adjusted to be high-temperature alkali leaching, and then the alkali leaching ore pulp is directly subjected to mixed acid leaching, so that insoluble silicate and silicon dioxide are converted into silicate which is easily dissolved in mixed acid, and the technical problem of efficient leaching of germanium is solved. According to the method, the leaching rate of germanium is high, the technological process is simple, silicon in the leachate can be effectively controlled, and comprehensive recycling of resources is facilitated.

The application provides an amino acid composite reagent system and a method for treating electronic waste to prepare high-purity glycine copper, and belongs to the technical field of metal hydrometallurgy and resource recycling. The application builds an ammonia catalytic reduction mechanism by designing an amino acid composite reagent system, greatly improves the leaching rate, simultaneously inhibits the dual effects of copper hydroxide precipitation and glycine chelation, and realizes efficient solution of copper ions; through narrow window regulation technology of pH at 9.5±0.2, the stability of ammonia, the activity of glycine anion are maintained, and the selective leaching rate of copper is ensured; a directional crystallization process of leaching solution is constructed, the "self-assembly directional crystallization" process of glycine copper chelate is used, based on the saturation concentration of glycine copper in the leaching solution and the stable chelate structure, through three-stage crystallization precise regulation, the preparation of high-purity crystal is realized. The process realizes the closed-loop crystallization system of "zero addition of crystal seeds and zero wastewater discharge" of the copper-containing complex leaching solution of electronic waste.

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 relates to the technical field of solid waste recycling, and particularly provides a circulating fluidized bed system for gasification fly ash resourceful treatment and an aluminum oxide leaching method. The system comprises a hearth, a gas-solid heat exchange bed and an activation reactor. The gasified fly ash and a water glass binder are agglomerated and thickened through a fine powder agglomerator, incineration is conducted through a hearth, and ammonia gas is injected to fix heavy metal; the ash enters an activation reactor, a mullite structure is destroyed by utilizing residual carbon oxygen-enriched combustion (850-950 DEG C) of fly ash, aluminum ions are extracted through gradient acid leaching, acid leaching liquid is neutralized by ammonia water to precipitate aluminum hydroxide, and high-purity aluminum oxide (greater than 99%) and a byproduct ammonium chloride fertilizer are obtained through calcination; the escape rate of fine particles is lower than 10%, the leaching rate of aluminum oxide exceeds 85%, and the treatment cost is reduced by 50% or above compared with that of a traditional method.

The invention provides a method for roasting-leaching clay type lithium ore by replacing a roasting aid with biomass, and belongs to the technical field of ore dressing processes. According to the method, the plant ash generated after biomass combustion is used for replacing part of alkali-containing salt or alkali in the clay type lithium ore so as to achieve the purpose of alkali roasting-water leaching, the sintering condition of a roasting auxiliary and the clay type ore can be effectively reduced through addition of the plant ash, and bulk consumption of solid waste of the plant ash is achieved. The invention provides a mixed roasting-water leaching method of plant ash generated after biomass combustion and clay type lithium ore, so that the consumption of a roasting auxiliary agent is greatly reduced (the consumption of an alkaline agent is reduced by 50-80%), the phenomenon that the roasting auxiliary agent and the clay type ore are easy to sinter at high temperature is improved, clean and effective utilization of biomass is realized, and the method is suitable for industrial production. The lithium obtained through the method is high in leaching rate and low in cost.

The invention relates to the technical field of solid waste biological treatment, and discloses La and Ce toxicity resistant thiobacillus thiooxidans and application thereof, and the collection number of the thiobacillus thiooxidans is GDMCC No: 63522. The invention provides a novel thiobacillus thiooxidans, and the preservation number of the novel thiobacillus thiooxidans is GDMCC No: 63522. The strain can highly tolerate La and Ce, and can realize biological leaching of solid wastes rich in La or (and) Ce under high ore pulp density, so that more solid wastes can be treated in a single batch, the biological leaching rate is improved, and the strain has a good application prospect.

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 invention provides a leaching and permeation effect evaluation method based on a multi-section column leaching device, and relates to the technical field of gold ore dump leaching engineering.The method comprises the following steps that leachate generated in the column leaching process is collected, and target components in the leachate are quantitatively measured; collecting residual leaching residues at different segmented column body positions after column leaching, and quantitatively determining target components in the leaching residues; obtaining the leaching rate of the target component according to the measured content of the target component in the leaching liquid and the content of the target component in the leaching residue; and after the column leaching is completed, sampling the segmented column body to obtain the permeability effect evaluation, namely the permeability coefficient. Based on the leaching rate and the permeability coefficient, a leaching effect difference value and a permeability effect difference value are obtained; and according to the leaching effect difference value and the permeability effect difference value, the material using mode is judged. According to the method provided by the invention, the leaching effect and the permeation effect in the column leaching process are quantitatively evaluated, and the method has important practical significance in guiding selection of dump leaching conditions.

The invention discloses an ionic rare earth ore continuous leaching method which comprises the following steps: putting ionic rare earth ore and a leaching agent solution into a multi-stage leaching reactor for parallel flow leaching, and carrying out solid-liquid separation to obtain a rare earth leaching solution and leaching tailings; the leached tailings and clear water are put into a multi-stage leaching reactor to be subjected to parallel flow leaching, and coarse-fraction tailings, medium-fraction tailings, fine-fraction tailings and leachate are obtained after grading and solid-liquid separation; the method comprises the following steps: enriching rare earth leachate and / or leaching liquid, and then circularly preparing a leaching agent solution; the rare earth leachate flows back to the multi-stage leaching reactor; and leacheate flows back to the multi-stage leaching reactor. Through continuous multi-stage parallel-flow leaching of a leaching agent solution, rare earth leaching liquid backflow for leaching, continuous multi-stage parallel-flow leaching of clear water and leaching liquid backflow for leaching, the rare earth leaching rate and the rare earth concentration of the leaching liquid are effectively increased, the consumption of the leaching agent is greatly reduced, the ore leaching period is remarkably shortened, and whole-process water balance and tailing grading comprehensive utilization are achieved.

The invention discloses a nuclear waste containing material and a preparation method and application thereof, and belongs to the technical field of nuclear waste treatment.The nuclear waste containing material is characterized in that site-specific doping of trivalent or tetravalent nuclides is achieved through trivalent or tetravalent nuclides, namely, A-site doping is conducted on Lu4Hf3O12 through Z < 3 + > or B-site doping is conducted on Lu4Hf3O12 through Z < 4 + >, the solid solubility of the A-site Z < 3 + > is as high as 25 mol%, and the solid solubility of the B-site Z < 4 + > is as high as 40 mol%; compared with a traditional pyrochlore-based material, the nuclide containing capacity is remarkably improved, the relative density of the nuclear waste containing material is larger than or equal to 95%, and the grain size can reach 1-5 microns; the prepared nuclear waste containing material is excellent in leaching resistance, and the leaching rate of the nuclear waste containing material is 2-4 orders of magnitude lower than that of a conventional curing material; the nuclear waste containing material prepared by the invention has better long-term chemical stability, and the mass loss rate of a highly-doped sample after long-term leaching is reduced by 21% compared with that of a low-doped sample.

The present invention relates to a method for jointly extracting niobium and iron from Bayan Obo rare earth tailings, belonging to the technical field of mineral recovery metallurgy, and solving at least one of the problems of low recovery efficiency, environmental pollution by hydrofluoric acid, and low extraction efficiency of niobium in the prior art. The method includes: pickling the Bayan Obo rare earth tailings, filtering to obtain pickling solution and filter residue; drying the filter residue, mixing it with ammonium sulfate and concentrated sulfuric acid, roasting, and leaching niobium for the first time; mixing the mixture after the first leaching with fluoride salt and water, leaching niobium for the second time, separating solid and liquid, extracting niobium from the obtained filtrate to obtain raffinate and an extraction solution containing niobium ions; mixing the pickling solution and the raffinate, adjusting the pH to 3 - 4.5, then adding hydrogen peroxide solution, and carrying out a precipitation reaction to form Fe(OH)3 precipitate. This method can realize the joint extraction of niobium and iron from Bayan Obo rare earth tailings, avoid the use of hydrofluoric acid, and has a relatively high leaching rate of niobium.

The invention provides an amino acid composite reagent system and a method for preparing high-purity copper glycinate by treating electronic waste through the amino acid composite reagent system, and belongs to the technical field of metal hydrometallurgy and resource regeneration. According to the method, an amino acid composite agent system is designed, an ammonia catalysis barrier reduction mechanism is constructed, the leaching rate is greatly increased, the double effects of copper hydroxide precipitation and glycine chelation are synchronously inhibited, and efficient dissolution of copper ions is achieved; the ammonia stability and the glycine anion activity are maintained through a narrow window regulation and control technology with the pH value being 9.5 + / -0.2, and the copper selective leaching rate is guaranteed; the method comprises the following steps: constructing a leaching solution directional crystallization process, and preparing a high-purity crystal by utilizing a self-assembly directional crystallization process of a copper glycinate chelate based on the saturation concentration of copper glycinate in the leaching solution and a stable chelation structure through precise regulation and control of three-stage crystallization. According to the process, a closed-loop crystallization system of'zero seed crystal addition and zero wastewater discharge 'of the copper-containing complex leaching solution of the electronic waste is realized.

The invention relates to the technical field of resource utilization of washed quartz sand ore tailing mud, in particular to ecological soil prepared from washed quartz sand ore tailing mud and a method of the ecological soil, the washed quartz sand ore tailing mud is used as a main raw material, coal gangue, a biological matrix and compound microorganism bacteria are mixed to prepare the ecological soil, the leaching rate of heavy metal is low, and the leaching rate is high. According to the present invention, the method has characteristics of simple operation, good stability and good solidification effect, can avoid the secondary pollution of the heavy metal to the environment, can improve the soil attribute of the ecological soil, can improve the quality of the ecological soil, can increase the resource utilization amount of the washed quartz sand ore tailing mud, can enhance the consumption amount, and can reduce the treatment cost and the treatment difficulty of the washed quartz sand ore tailing mud.

The present application relates to the field of non-ferrous smelting solid waste resource utilization and pollution control technology, and specifically discloses a zinc oxide fume treatment control system and method. The system comprises a raw material slurry module, a first-stage leaching alkali control module, a second-stage leaching temperature control module and a calcification arsenic precipitation control module. In the first-stage leaching process, the efficient arsenic leaching balance point is dynamically captured according to the arsenic and zinc leaching rate variation curve with pH, and the leaching agent addition amount is accurately controlled; in the second-stage leaching, the heating temperature is real-time regulated according to the dissolved zinc rate; before the calcification arsenic precipitation, oxidation treatment is carried out, the oxidation-reduction potential is controlled based on the trivalent arsenic oxidation efficiency, and the lime milk addition amount is dynamically adjusted according to the arsenic concentration and zinc content in the precipitate during the arsenic precipitation process. The present application realizes efficient selective leaching and stable solidification of arsenic, effectively inhibits the loss of zinc, and has the advantages of high separation efficiency, high resource recovery rate and the like.