18results about How to "Efficient leaching" patented technology

The invention discloses an iron-carbon catalytic material based on coal gasification slag as well as a preparation method and application of the iron-carbon catalytic material, and belongs to the technical field of industrial solid waste recycling. The preparation method comprises the following steps: adding dried coal gasification slag into an oxalic acid solution for extraction to obtain a suspension A; adding a reducing agent into the suspension A, carrying out precipitation reaction, and then carrying out solid-liquid separation to obtain a solid B; and sintering the solid B to obtain the composite material. The invention further discloses the iron-carbon catalytic material based on the coal gasification slag prepared by the method and application of the iron-carbon catalytic material. According to the method, the industrial solid waste coal gasification slag is used as a carrier, endogenous iron in the coal gasification slag is converted by adopting an acid leaching-reduction precipitation-roasting method, the iron-supported catalytic material with a stable structure and excellent performance is obtained, the process is green, the cost is low, the organic wastewater treatment capacity is excellent, and the practical value is relatively good.

This invention provides a method for preparing nano-calcium carbonate, comprising the following cyclical processes: (1) pretreatment of dry carbide slag raw materials; (2) leaching Ca from the dry carbide slag with ammonium chloride solution. 2+ And perform solid-liquid separation to obtain a high-purity calcium chloride solution and ammonia. (3) Use the ammonia in (2) to absorb low-concentration CO2 flue gas to obtain a mixed solution of ammonium carbonate and ammonium bicarbonate; (4) Mix the mixed solution of ammonium carbonate and ammonium bicarbonate obtained in (3) with the calcium chloride solution obtained in (2) to obtain calcium carbonate precipitate and ammonium chloride solution; (5) Use the ammonium chloride solution obtained in (4) to evaporate and concentrate, and return to step (2) to complete the entire cycle process. This method uses the escaped ammonia produced by the traditional ammonium chloride leaching CO2 to dry carbide slag to absorb flue gas to prepare ammonium carbonate and ammonium bicarbonate. It not only achieves efficient conversion of low-concentration flue gas CO2, significantly reduces conversion costs, and improves economic feasibility, but also uses the high-concentration ammonium carbonate of the conversion product to produce nano-CaCO3, which has significant environmental and economic benefits.

This invention relates to an ultrasonic field-enhanced gas-filled leaching tank, comprising a tank body, a stirring device, a gas filling device, and an ultrasonic generator. The tank body has a leaching chamber with an open upper end. The stirring head of the stirring device is located inside the leaching chamber. The gas filling device includes a gas filling pipe, with its inlet located outside the leaching chamber for connecting to an external gas supply device, and its outlet located inside the leaching chamber. The ultrasonic generator includes an ultrasonic probe, which is disposed inside the gas filling pipe to generate an ultrasonic field enhancement effect when gas is transported through the gas filling pipe. Compared with the prior art, the ultrasonic field-enhanced gas-filled leaching tank provided by this invention enhances the synergistic oxidation of oxidants and non-ferrous metals through ultrasound, achieving rapid and efficient leaching of non-ferrous metals. The advantage of this technology is that ultrasound can generate strong liquid flow shear force and microbubbles, increasing the contact area between the liquid and the metal surface, promoting the reaction between the oxidant and the non-ferrous metals, and improving leaching efficiency.

The invention provides a clay type lithium ore external field enhanced resource comprehensive utilization method, and relates to the field of hydrometallurgy. The method comprises the following steps: uniformly mixing clay type lithium ore with concentrated sulfuric acid, and carrying out low-temperature curing to obtain clinker; mixing the clinker with water, and then carrying out leaching reaction to obtain a lithium-rich aluminum leaching solution; carrying out evaporative crystallization on the lithium-rich aluminum leachate to obtain a mixed crystal of lithium sulfate and aluminum sulfate; performing high-temperature pyrolysis reaction on the mixed crystal to obtain an oxide; carrying out high-energy grinding and leaching on the oxide, and filtering to obtain a lithium-containing solution and crude aluminum oxide; and carrying out post-treatment on the lithium-containing solution to obtain the battery-grade lithium carbonate. According to the method, the technological process of the clay type lithium ore is optimized, synchronous leaching of valuable elements lithium and aluminum and efficient separation of the lithium element and the aluminum element are achieved, the problem that the cost is high when lithium is independently extracted is solved, cooperative utilization of clay type lithium ore resources is achieved, and the cost is reduced.

Relating to the technical field of solid waste resource utilization, the invention discloses a waste incineration fly ash cold bonding aggregate granulation device, which comprises a shell assembly, a center driving and liquid distribution system, a feeding and diversion system, a supergravity reaction rotor, an edge granulation mechanism, a bottom maintenance discharge system and a gas phase and sensing system. Fly ash materials are conveyed and smashed through the feeding and guiding system, then supergravity carbonization and chelating spraying treatment are carried out through the center driving and liquid distributing system, the supergravity reaction rotor and the gas phase system, after fly ash slurry is formed, extrusion compact forming is carried out through the edge granulation mechanism, and the fly ash slurry is obtained. And the formed cold bonding aggregate is cured by the bottom curing and discharging system and then is discharged from the star-shaped discharging valve. According to the method, efficient chemical reaction under a high gravity field and high-strength physical extrusion forming are organically combined, the problems that in the prior art, the carbonization rate is low, the aggregate strength is low and the leaching risk is high are solved, and the high-density and low-leaching fly ash based road aggregate is continuously prepared through a one-step method.

The invention discloses a deep-eutectic solvent, preparation thereof and application of the deep-eutectic solvent in recovery of a waste ternary lithium battery positive electrode material. The eutectic solvent is composed of ethylene glycol and lactic acid, and the molar ratio of ethylene glycol to lactic acid is 1: 10-10: 1. According to the method, a new eutectic solvent system is creatively constructed, selective leaching of the lithium element in the positive electrode material of the waste ternary lithium battery can be achieved, the coprecipitation process of key metal precursors such as nickel, cobalt and manganese is synchronously promoted, high-valued circulation and utilization of the waste ternary lithium battery are promoted, and the method is suitable for industrial production. The complex process of traditional multi-metal step-by-step separation is avoided, and the operation steps are simplified. In addition, the eutectic solvent can be recycled for more than five times, so that the battery recycling cost is reduced. The recycling method provided by the invention also greatly widens the separation and recycling ways of valuable metals in the waste batteries, and shows wide application potential and important value in the field of resource recycling.

The application relates to a method and device for leaching gallium and germanium from zinc leaching residue by using a strong magnetic field and composite ultrasonic waves, which comprises the following steps: S1, drying and grinding zinc powder replacement residue cakes to obtain zinc powder replacement residue powder; S2, mixing the zinc powder replacement residue powder obtained in the step S1 with low-concentration sulfuric acid, sealing, heating, inputting oxygen, stirring, ultrasonic treatment in a magnetic field environment, and filtering to obtain first-stage acid leaching residue and first-stage acid leaching solution; S3, mixing the first-stage acid leaching residue obtained in the step S2 with high-concentration sulfuric acid, sealing, heating, inputting oxygen, stirring, ultrasonic treatment in a magnetic field environment, and filtering to obtain second-stage acid leaching residue and second-stage acid leaching solution; and S4, drying the second-stage acid leaching residue obtained in the step S3 to obtain zinc powder replacement residue for leaching gallium and germanium. Compared with the prior art, the application combines oxygen pressure, ultrasonic waves, a magnetic field and stirring and other process conditions, so that more metal elements are exposed from the inside of the zinc powder replacement residue, and the leaching efficiency is improved.

This invention provides a method for recovering valuable metals from spent lithium-ion batteries. The method utilizes a eutectic solvent composed of dimethyl-β-propionate thiophene as a hydrogen bond acceptor and lactic acid as a hydrogen bond donor, with the addition of ethanol, to separate valuable metals from spent lithium-ion batteries. Ultimately, lithium is recovered as lithium carbonate, manganese as hydroxide, and nickel and cobalt as metal oxides, achieving high separation efficiency. This invention employs a eutectic solvent to selectively separate multiple valuable elements from the cathode material of spent lithium-ion batteries, significantly shortening the reaction time. The selective recovery rate of transition metal elements can reach over 90%, and the lithium recovery rate can reach over 99%.

The application discloses a kind of waste lithium ion battery powder leaching methods, it is related to battery recycling technical field.Adopting ferrous sulfate as leaching agent can leach the main metal and impurity except copper in battery powder under mild conditions;Utilize nickel-cobalt slag to reduce ferric iron, while improving the main metal concentration in feed liquid without introducing new impurities;Aluminum is removed by bicarbonate to obtain aluminum slag, there is still a small amount of ferric ion in the process of removing aluminum, under the synergistic effect of a small amount of ferric ion, the aluminum slag obtained in the aluminum removal process is regular round, the aluminum content in the slag is high, the slag amount is small, the solid-liquid separation speed is fast, and the metal loss rate is low;After positive electrode powder is oxidized by ferrous ion, iron is removed to obtain purified liquid.The process of the application is simple, low in cost and highly practical, and can efficiently leach valuable metals under mild leaching conditions, and the leaching agent can be recycled.

This invention discloses an enhanced leaching and purification method for tellurium in arsenic-antimony-tellurium alkaline slag, belonging to the field of solid waste resource utilization and rare and dispersed metal extraction in non-ferrous metal smelting. Using high-arsenic-antimony-tellurium alkaline slag as raw material, a mixed leaching method with tellurium-directed leaching agents is employed. Through the synergistic effect of "strong alkali complexation-reduction solubilization-high salt stable solubility," efficient tellurium leaching and directional retention of arsenic and antimony are achieved, resulting in a low-impurity tellurium-containing solution after solid-liquid separation. After pH adjustment, a one-step tellurium purification agent is added for reduction purification, directly preparing high-grade elemental tellurium. This invention overcomes the limitations of traditional step-by-step processes, with high tellurium recovery as the core technical objective, achieving efficient separation and one-step purification of tellurium from arsenic and antimony: tellurium leaching rate ≥95%, reduction purification rate ≥98%, total recovery rate ≥93%, product grade ≥99.5%; arsenic and antimony leaching rates ≤3.5% and ≤5.0%, respectively. The leaching residue and purified liquid can be recycled. The process is short, the reagent consumption is low, it is compatible with conventional equipment, and it is suitable for industrial promotion.

The utility model relates to the technical field of intelligent steam cabinets, in particular to a multifunctional intelligent steam cabinet which comprises a machine body and a placing mechanism, an opening and closing door is arranged on one side of the front face of the machine body, the opening and closing door is hinged to the front face of the machine body, a handle is arranged on the opening and closing door, and a controller is arranged on the other side of the front face of the machine body. The controller is electrically connected with the machine body, the placing mechanism is arranged at the top of the machine body and comprises a telescopic air cylinder, a square block, an electromagnet, a draining frame, a collecting frame and a limiting block, one end of the telescopic air cylinder is connected with the top of the machine body, and the other end of the telescopic air cylinder is connected with one end of the square block; one end of the square block extends into the water draining frame, the other end of the square block partially extends into the water draining frame, the water draining frame is provided with a groove body matched with the square block, one end of the electromagnet is arranged on the square block, and the multifunctional intelligent steam cabinet solves the problem that existing equipment is inconvenient to temporarily prevent food.

The application discloses a method and device for catalytic leaching of argillaceous uranium ore based on ozone, and relates to the technical field of uranium leaching and reaction equipment. The application utilizes biomass raw materials and iron-based material powder to prepare a magnetic composite material with catalysis-adsorption dual functions through in-situ reduction by high-temperature heat treatment. The slurry of argillaceous uranium ore and the magnetic composite material are mixed in a reactor for reaction. Ozone is introduced through an aeration disc to avoid bubble aggregation, significantly increase the gas-liquid contact area, and improve the ozone utilization rate. A spiral guide plate is arranged in the reactor to effectively prolong the gas-liquid contact time and improve the ozone mass transfer efficiency. A magnetic recovery device is used to recover the magnetic material to ensure the catalyst activity, reduce the catalyst loss rate, and realize efficient catalysis. Through optimization of the reactor structure, the catalyst preparation process and the process flow, the ozone utilization rate and the leaching efficiency of the argillaceous uranium ore are significantly improved, and the catalyst recycling and the recycling of residual gas are realized.

This invention relates to a method and apparatus for ultrasonically enhanced leaching of gallium and germanium from zinc powder replacement slag. The method includes the following steps: S1, drying and grinding the zinc powder replacement slag block into zinc powder replacement slag powder, adding a low-concentration sulfuric acid solution, sealing, introducing oxygen, heating, stirring, ultrasonicating, and filtering to separate a first-stage acid leaching slag and a first-stage acid leaching solution; S2, mixing the first-stage acid leaching slag with a high-concentration sulfuric acid solution, sealing, introducing oxygen, heating, stirring, ultrasonicating, and filtering to separate a second-stage acid leaching slag and a second-stage acid leaching solution; S3, drying the second-stage acid leaching slag to obtain the zinc powder replacement slag from which gallium and germanium are leached. Compared with the prior art, this invention, by combining a series of process conditions such as oxygen pressure, ultrasonication, and stirring, greatly improves the leaching efficiency of gallium and germanium. It also has the advantages of simple equipment, convenient control, and low pollution, making it suitable for traditional continuous industrial production and providing valuable reference for the leaching of other elements.

The invention discloses a selective lithium extraction and green regeneration method for a waste lithium titanate battery. The method comprises the following steps: firstly, pretreating the waste lithium titanate battery to obtain black powder containing lithium titanate; then selectively leaching lithium by adopting a quaternary ammonium salt / gluconic acid / ethylene glycol-based eutectic solvent to obtain a lithium-rich leaching solution and leaching slag containing a titanium compound; the leachate is circularly used for leaching lithium in the black powder until the lithium is saturated, a saturated sodium carbonate solution is added for reaction, washing and drying are performed after solid-liquid separation, and battery-grade lithium carbonate is obtained; the leaching residues are subjected to impurity removal, washing and drying, and a titanium compound is obtained; and finally, preparing the lithium titanate negative electrode material by taking the lithium titanate and battery-grade lithium carbonate as a precursor. According to the method, a traditional strong acid leaching process is replaced with the environment-friendly green solvent, the method has the remarkable advantages that the process is simple, the solvent can be recycled, and secondary pollution is avoided, efficient selective extraction of lithium in the waste lithium titanate battery and green short-process regeneration of the lithium titanate negative electrode material are achieved, and the method has excellent industrial application prospects.

The present application relates to the field of environmental protection, and discloses a method for degrading formamide organic wastewater and recovering key metals from retired lithium ion batteries. The method comprises the following steps: S1, obtaining a positive electrode material of a retired lithium ion battery, mixing the positive electrode material with formamide organic wastewater, and performing a hydrothermal reaction to obtain a leaching solution; S2, adjusting the pH of the leaching solution to 6-14, and performing a transition metal precipitation reaction to obtain a transition metal hydroxide precursor and a lithium-rich filtrate; and S3, adding a sodium carbonate solution to the lithium-rich filtrate, performing a precipitation reaction, and collecting lithium carbonate. The formamide organic wastewater acts as an endogenous reducing agent, and under hydrothermal conditions, it achieves deep degradation of itself while achieving efficient leaching of key metals in the retired lithium ion battery, thereby achieving waste treatment with waste. The degradation efficiency of formamide can reach more than 90%, overcoming the defects of high energy consumption, large reagent consumption, high cost, low degradation efficiency and large environmental treatment pressure of existing formamide wastewater treatment methods.

The invention provides a recycling method of a lithium iron phosphate battery positive electrode material. The method comprises the following steps: mixing a lithium iron phosphate battery positive electrode material roasted in an inert atmosphere with an alkaline solution with the pH value of 14.2-14.6 according to a liquid-solid volume mass ratio of 30-50 mL / g, leaching at a first temperature, leaching at a second temperature, separating to obtain a leaching solution and ferroferric oxide, adjusting the pH value of the leaching solution to 11.5-13.5, heating to 70-110 DEG C, aging and precipitating lithium, and filtering to obtain the lithium iron phosphate battery positive electrode material. And separating to obtain lithium phosphate and lithium precipitation mother liquor. Wherein the first temperature is 25-45 DEG C, and the second temperature is 5-20 DEG C lower than the first temperature. According to the method, an alkali leaching lithium extraction-lithium precipitation process is adopted, and the liquid-solid ratio is combined with pH and temperature regulation and control, so that efficient leaching of lithium and phosphorus is realized, and lithium phosphate and ferroferric oxide are synchronously recovered. The lithium precipitation reagent is not additionally introduced, the whole process is simple, efficient and green, and the method has important significance on sustainable development of the new energy industry.

This invention relates to the field of electrochemical energy storage material preparation technology, specifically to a method and the cathode material, sodium vanadium fluorophosphate, for preparing sodium-ion batteries using electrolytic aluminum waste. The invention uses cryolite and vanadium alumina slag from electrolytic aluminum waste as raw materials. Through a process of "activation-synergistic leaching-deep selective impurity removal-precise fluoride-phosphorus control," sodium, vanadium, and fluorine resources are extracted and purified. High-performance products are synthesized through temperature-controlled seed crystal induction. Aluminum is thoroughly removed through solvent extraction / ion exchange, and the ratio is precisely controlled by an online fluoride ion monitoring system, solving the problems of complex impurities and large compositional fluctuations in the waste material. The Na3V2(PO4)2F3 prepared by this invention has a purity ≥99.2%, an iron content <30ppm, regular crystals, uniform particle size, a first discharge specific capacity ≥126mAh / g at 0.1C, and a capacity retention rate ≥92% after 500 cycles at 1C, demonstrating excellent performance.

The present application relates to the technical field of electrode material recycling, and particularly relates to a method for recycling lithium salt in a lithium-ion battery with a state of charge. The method for recycling lithium salt in a lithium-ion battery with a state of charge comprises the following steps: disassembling a lithium-ion battery with a state of charge to obtain a lithium-embedded graphite negative electrode; placing the lithium-embedded graphite negative electrode into a solvent, allowing it to react and separate to obtain a lithium salt solution; and evaporating and concentrating the lithium salt solution to obtain lithium salt. The present application solves the technical problem of low leaching rate of lithium salt in the existing lithium-ion battery recycling technology, and also solves the problems of high cost, high energy consumption and poor environmental protection in the existing lithium-ion battery recycling technology.