42results about How to "Leaching is effective" patented technology

The invention discloses a method for selectively leaching sedimentary type rare earths. The method comprises the steps that a, the sedimentary type rare earths are pulverized into powder; b, the powder is calcinated for 0.5-5 hours at the temperature of 550-850 DEG C; c, the calcinated powder is cooled down for 0.5-48 hours at room temperature to obtain cooled hydrated powder; d, the hydrated powder is put into organic acid with the concentration of 0.5-5 mol / L to be reacted for 0.5-5 hours, the liquid-solid ratio is 2-20 L / kg, the leaching temperature is 20-90 DEG C, rare earth liquid is obtained, and remaining slag is washed until neutral, and acid washing liquid is recycled; the content of rare earth oxide (REO) in the sedimentary rare earths is equal to or less that 1.6%, and rare earth elements exist in clay minerals in the form of isomorphic substitution. According to the method, the rare earth element leaching rate is higher than 90% aiming at the technical difficulty of sedimentary rare earths in Guizhou province, the leaching of impurity elements can be effectively inhibited, and the method has the advantages of low energy consumption and convenient and controllable operation.

The invention discloses a chrome tanning sludge heavy metal chromium regeneration method, and the method includes extraction of chrome tanning sludge with hydrochloric acid, reduction of Cr<6 +> in the leaching solution by use of sodium bisulfate, adsorption of Cr<3 +> by use of 732 sodium type cation exchange resin, and desorption of the Cr<3 +> on the resin by use of hydrochloric acid or sulfuric acid. According to the method, the hydrochloric acid as an acid leaching extraction agent is cheap, and can effectively leach metal chromium in the chrome tanning sludge, the chromium efficiency is more than 80%; the sodium 732 type cation exchange resin as an adsorbent can preferentially adsorb the Cr<3 +> in the leaching solution, the adsorption and recovery rate can reach up to 96.1%, and the efficient chromium separation and purification can be realized. At the same time, the resin can be recycled by regeneration, the processing cost can be effectively reduced; by desorption of the Cr<3 +> by use of hydrochloric acid or sulfuric acid, corresponding chromium chloride solution and chromic sulfate solution products can be obtained, and the chromium chloride solution and chromic sulfate solution products can be can used in trivalent chromium electroplating industry.

The invention relates to a production method of instant green tea soybean milk powder, belonging to the technical field of instant tea beverages. The invention solves the problem that the existing soy milk tea powder product does not well integrate the two flavors, and the two different powders are not easy to brew and dissolve, which affects the taste and taste, and provides a production of instant green tea soy milk powder In this method, green tea is extracted, filtered and concentrated to make a concentrated solution, and then mixed with soybean milk powder, and the ultrasonic dispersion technology is used to blend the two well, and finally the instant green tea soybean milk powder is obtained through pressurized spray drying , the flavor and effective ingredients of green tea have been integrated into the soy milk powder, which is easier to dissolve in water, easy to brew, and has better flavor and nutrition.

The invention relates to the field of metal smelting, particularly to a method for recovering zinc, indium, iron, and lead from a high-iron zinc oxide mixture smelted with zinc. The method comprises the following processes: a high-iron zinc oxide mixture neutral leaching process, a neutral leaching residue low acid leaching process, a low acid pressure filter residue peracid leaching process, a low acid leaching liquid prereduction process, and a indium enrichment recycling process; valuable metals are comprehensively recovered from the high-iron zinc oxide mixture; a generated neutral leaching liquid is adopted by a main zinc smelting system to generate electrolytic zinc; a hydrolyzing filter liquor generated from the indium enrichment recycling process contains relatively rich ferrous ions; the hydrolyzing filter liquor is adopted by the main system for removing impurities and generating high-grade indium enrichment residues; therefore, the high-iron zinc oxide mixture is effectively recycled, the problem of high-iron zinc oxide mixture treatment is solved, capability of comprehensive utilization of metal resources is increased, so that resources are comprehensively recycled, and environment protection is facilitated; the method has relatively good economic benefits and social benefits.

The invention relates to a comprehensive utilization method of slag iron ore concentrates of a wet-type zinc smelting furnace and belongs to the technical field of metallurgy. The method comprises the following steps: performing two-section counterflow leaching on raw material (slag iron ore concentrates in the wet-type zinc smelting furnace) in the presence of a hydrochloric acid aqueous solution serving as a leaching agent so that valuable metals such as iron, silver, copper, lead, zinc and arsenic in the slag iron ore concentrates enter a leachate; purifying the leachate by utilizing processes of metal iron powder replacement, control over pH (Power Of Hydrogen) value, arsenic sedimentation, sulfuration precipitation and the like, separating the valuable metals such as copper, silver, lead, zinc and arsenic, wherein the purified leachate is a pure FeCl2 aqueous solution; performing thermal decomposition on the pure FeCl2 aqueous solution in a spraying manner so as to obtain Fe2O3 powder; and absorbing the generated HCL gas with water so as to regenerate hydrochloric acid which returns to the leaching process. By the method, the valuable elements in the slag iron ore concentrates of the wet-type zinc smelting furnace are comprehensively separated and recycled; and the hydrochloric acid taken as a leaching agent can be recycled, so that the method realizes resource conservation and is friendly to the environment. During the whole process, the discharge of three wastes is basically avoided; all the resources are utilized to the greatest extent; and obtained products are convenient for subsequent treatment and processing. The method has the advantages of environmental friendliness, economical performance, energy conservation and high resource utilization rate, thereby being convenient for industrial production.

A method for preparing battery grade lithium carbonate from waste lithium iron phosphate electrode sheets relates to that technical field of lithium batteries. The method comprises the steps of: 1, releasing electricity; 2, performing oxidizing and roasting to obtain electrode sheet roast material containing lithium iron phosphate active material and current collector aluminum foil; 3, pulverizingthe roasted material and performing screening to obtain separated aluminum powder and lithium iron phosphate electrode sheet powder; 4, detecting the content of the lithium element in the lithium iron phosphate electrode sheet powder, preparing an acid solution according to a certain molar ratio according to the content of the lithium element, adding the lithium iron phosphate electrode sheet powder into the acid solution according to a certain mass-solid-liquid ratio for reaction, and finally filtering to obtain a first mixed liquid; 5, adding sodium hydroxide into the first mixed solution for reaction, and filtering to obtain a second mixed solution; 6, reacting the second mixed solution with the sodium carbonate solution and filtering to obtain battery-grade lithium carbonate. The invention can effectively improve the leaching rate of the lithium element and the purity of lithium carbonate.

The invention discloses a manganese carbonate ore leaching method based on two-section leaching. The method includes the following steps that high-grade manganese carbonate ore is ground into powder and added into a reactor; then, anode liquor and concentrated sulfuric acid are added for the first-section leaching reaction, wherein the leaching reaction time is at least 2 h; remaining acid left after the reaction is detected, and a neutralizer is added on this basis to conduct neutralization; solid-liquid separation is conducted on neutralized ore pulp, obtained first-section solid substances are thrown into the reactor, and concentrated sulfuric acid and anode liquor are added for second-section leaching, wherein the leaching reaction time is at least 2 h; impurity removal and solid-liquid separation are conducted on the obtained leaching agent to obtain qualified electrolysis liquid; low-grade manganese carbonate ore powder, anode liquid and concentrated sulfuric acid are added after the second-section leaching is finished to conduct neutralization leaching; and finally, adding a neutralizer again, and impurity removal is conducted; and solid-liquid separation is conducted on impurity-removed ore pulp to obtain qualified electrolysis liquid and solid residues. The method has the beneficial effects of being small in residue amount, high in leaching rate, low in sulfuric acid consumption, high in comprehensive recovery rate and the like.

The invention provides a method for recovering metallic lead from lead-containing materials such as lead sulfate slag, which solves the problems of high energy consumption, high cost, large pollution, and poor application when recovering metallic lead from lead-containing materials such as lead sulfate slag. Issues with limited range, safety hazards, and inability to take full advantage of metal. The method recovers lead in lead-containing materials such as lead sulfate slag according to the following steps: (1) chlorination leaching process; (2) sodium carbonate conversion process; 3) methanesulfonic acid leaching process; 4) electrowinning process; 5) melting and casting process.

A manganese carbonate ore leaching method based on two sections of leaching, provided by the invention, comprises the following steps: adding high-grade manganese carbonate ore ground powder into a reactor, then adding anolyte and concentrated sulfuric acid and carrying out front-section leaching reaction for at least two hours; detecting residual acid left after reaction, accordingly adding a neutralizer to carry out neutralization, and introducing air to remove impurities; carrying out solid-liquid separation on ore pulp from which impurities are removed, then, putting one section of solids, obtained, into the reactor, adding concentrated sulfuric acid and anolyte, and carrying out leaching reaction for at least two hours; then, adding low-grade manganese carbonate ore powder, anolyte and concentrated sulfuric acid so as to carry out neutralization and leaching; finally adding a neutralizer, and introducing air to remove impurities; and carrying out solid-liquid separation on ore pulp from which impurities are removed so as to obtain an electrolysis qualified solution and solid residues. The method has the advantages of being low in residue quantity, high in leaching rate, low in sulfuric acid consumption, high in comprehensive recovery rate and the like.