30results about "Zinc compounds preparation" patented technology

Provided is a manufacturing method of high purity oxide powder including the steps of subjecting a raw material such as Zn-containing scrap to acid leaching or electrolytic extraction, thereafter performing solvent extraction and activated carbon treatment thereto in order to remove impurities, neutralizing the resultant solution freed of impurities with an alkaline solution to obtain zinc hydroxide, and firing the zinc hydroxide to obtain zinc oxide. Provided are high purity zinc oxide efficiently freed of impurities, in particular C, Cl, S and Pb impurities, at low cost and the manufacturing method thereof; a target manufactured by firing the high purity zinc oxide; and a high purity zinc oxide thin film obtained by the sputtering the target.

The invention discloses a method for preparing zinc sulphate monohydrate from zinc-containing waste residues. The method is characterized by comprising the following steps of (1), acid leaching; (2), oxidation for iron removal; (3), extraction of copper; (4), replacement for cadmium removal; (5), concentration and crystallization. The method for preparing the zinc sulphate monohydrate from the zinc-containing waste residues is a low-carbon and environmentally-friendly scheme, the preparation raw material is low in cost, waste is reutilized, the environmental problem that existing zinc-containing waste residues cannot be recycled and utilized is solved, the preparation process is energy-saving and environmentally-friendly, no waste gas or waste water is generated, a reagent unfriendly to the environment is not used, meanwhile metal, such as the copper and cadmium, is recycled, and the waste residues are reutilized.

The invention discloses a resourceful treatment method of hot galvanizing pickling waste liquid, which comprises the following steps: filtering the pickling waste liquid to remove suspended matters and insoluble solids, and adding a reducing agent to reduce Fe < 3 + > in the pickling waste liquid into Fe < 2 + >; carrying out multi-stage countercurrent extraction on the pickling waste liquid through an extraction agent, carrying out reverse extraction on an organic phase through a reverse extraction agent, filtering reverse extraction liquid to obtain a filter cake A, dissolving the filter cake A with diluted hydrochloric acid, and adding a small amount of pickling waste liquid to obtain a solution A; adjusting the pH value of the solution A by using ammonia water and ammonium chloride toremove Fe < 3 + > to obtain a solution B; adding strong alkali into the solution B, and heating and boiling until no ammonia smell exists, so as to obtain a solution C containing white precipitate; and filtering the white precipitate to obtain a filter cake B, and drying the filter cake B to obtain zinc oxide. The recovery treatment method for the hot galvanizing pickling waste liquid is simple, low in energy consumption, safe to operate, low in investment cost, capable of achieving maximum resourceful utilization of the hot galvanizing pickling waste liquid, convenient to implement, easy to maintain and manage and worthy of being further popularized in industrial production.

A method is provided for producing separated substances, particularly metal compounds, the dopant element amounts of which have been controlled by the use of an apparatus that processes fluid between the processing surfaces of a processing member that can be made to approach/separate and which rotate relative to each other. The substance to be separated is separated by mixing a raw material solution, wherein the substance to be separated is solubilized in a solvent, with the solvent for separation and with the dopant element or dopant element-containing substance solubilized in at least one solvent selected from the solvent of said raw material solution, said solvent for separation or a solvent other than that of said raw material solution or said solution for separation. Separated substances with controlled dopant element amounts are obtained by controlling the solubility of the dopant element or dopant element-containing substance in the solvent for separation.

The invention discloses a superfine particle zinc oxide powder production technology. The production technology comprises the following steps of 1 leaching, 2 oxidation treating, 3 filtering, 4 replacing and 5 extracting and grinding. The zinc oxide production technology is simple, therefore, energy consumption is low, and the production cost is reduced; the production technology is more scientific, and by adding the replacing step, the prepared zinc oxide product is higher in purity; through grinding treatment of grinding equipment, the diameters of particles of zinc oxide are smaller, the sizes of the particles of zinc oxide are more uniform, and therefore the using range of zinc oxide produced through the scheme is wider.

The invention provides a treatment method of a waste acid solution containing heavy metals, which comprises the following steps: carrying out iron-carbon reduction treatment on the waste acid solutionto reduce Fe< 3 + > in the solution into Fe < 2 + >; under the condition of high-concentration acid, adopting an ammonia extraction agent toextracta waste zinc solution and a waste acid solution, wherein the waste zinc solution contains Zn < 2 + >, and the waste acid solution contains at least one of iron ions, nickel ions, chromium ions and lead ions; adding an alkaline substance into the wastezinc solution to obtain zinc hydroxide and an organic solvent can be used as theammonia extraction agent; and precipitating heavy metals in the waste acid solutionby a synthestic sulfur precipitant. Compared with the prior art, the method has the following advantages that ferric ions are reduced, free acid is reduced and a small amount of heavy metalsarereplaced by utilizing an iron elementary substance while iron-carbon pretreatment is carried out; the zinc separation rate can reach 99.8% or above; the obtained zinc oxide product with the content of 98% or above can be used for selling; one part of an obtained supernatant can be used for circulating water, and the other part can be used for industrial water.

The invention discloses a method for removing and recovering fluorine and chlorine from a zinc sulfate solution, which comprises the steps of adsorption, resin regeneration, desorption solution regeneration and fluorine and chlorine recycling, and specifically comprises the following steps: sequentially passing a zinc sulfate solution containing fluorine and chlorine through an ion exchange columnfrom bottom to top to obtain fluorine and chlorine-loaded resin a, carrying out countercurrent desorption by using a sulfuric acid solution to obtain a desorbed solution c, distilling to obtain a regenerated desorption solution d and a mixed gas of HF and HCl, condensing to obtain a hydrofluoric acid product, and absorbing the residual HCl gas with water to obtain a hydrochloric acid product, thereby respectively recycling fluorine and chlorine. The method has the advantages of simple process, recycling of the desorption solution, solving of the problems of large ion exchange desorption solution use amount and large wastewater amount, realization of preparation of hydrofluoric acid and hydrochloric acid products from fluorine and chlorine impurities, high fluorine and chlorine removal efficiency, low production cost, greenness, environmental protection, no generation of three wastes in the process, easiness in connection with a zinc smelting system, and industrial production promotionand application values.

The invention relates to a method for recycling iron-containing zinc-containing sludge to prepare zinc hydroxide and dye-grade iron oxide yellow and belongs to the field of waste resourceful treatment. The method comprises the steps of adding hydrochloric acid into iron-containing zinc-containing sludge to adjusting a pH value, then adding steel scrap, stirring, extracting in an extraction agent, classifying and deoiling; performing back extraction on zinc-containing load organic phase to prepare zinc hydroxide; adding alkaline substance into ferrous chloride solution with the zinc content smaller than or equal to 1g/L to adjust a pH value as 3.0 to 7.5 in 12 to 32 DEG C, introducing oxidizing gas, performing low-temperature oxidization with oxidization time of 60 to 1200min, warming to 50 to 90 DEG C, adding alkaline substance to adjust a pH value to be 2.8 to 3.6, introducing oxidizing gas, oxidizing for 30 to 115h, guaranteeing the pH value of liquid to be 2.8 to 3.6 in an oxidizing process, finishing oxidization, filtering and drying to obtain the dye-grade iron oxide yellow. The method is a recycling technology of iron-containing zinc-containing sludge in a hot galvanizing factory and has the advantages of small equipment invest, low energy consumption and high purity of a prepared product.

Provided is a method for inhibiting extractant degradation in the DSX process through the manganese extraction control, the method comprising: (a) stirring DSX solvent and DSX feed solution, which is a solution containing a valuable metal from which iron has been removed in an agitator, in which soda ash (Na₂CO₃) is further added to maintain a constant pH; and (b) scrubbing the manganese from the DSX solvent, extracted in step (a).

Provided is a method for inhibiting extractant degradation in the DSX process through the metal extraction control, the method comprising steps of: (a) adding limestone to a copper solvent extraction-raffinate to precipitate iron (Fe) and aluminum (Al) as a slurry, recovering a clarifying liquid; and (b) adding sulfuric acid to the recovered clarifying liquid to adjust the pH thereof.

Provided is a method for inhibiting extractant degradation comprising preparing step, extracting step and scrubbing step, the method including: (a) the preparing step of a DSX solvent by adjusting the extractant concentration of the DSX solvent to a specific range; (b) the extracting step of metal included in the feed solution by adjusting the ratio of the organic (solvent) and an aqueous (solution) as a feed solution; (c) the scrubbing step of adjusting the zinc concentration of the solution using zinc sulfate; and (d) stripping step.

Provided is a method for inhibiting extractant degradation by a diluent and an extractant input manner, the method including steps of: (a) determining and analyzing the total volume of the DSX solvent when the diluent and the extractant, which are the DSX solvents, are added in the DSX process and identifying the concentration of the extractant; (b) calculating an extractant concentration according to an amount of the diluent to be added based on the analysis value of step (a), and then adding the extractant; (c) determining the ratio between the extractants through analysis after adding the extractants; (d) adding the extractant to be needed when the ratio between extractants is out of the range; and (e) adding the diluent and analyzing the ratio between the extractants.

The invention belongs to the technical field of waste incineration fly ash treatment, and particularly relates to a resource utilization method of waste incineration fly ash. According to the method provided by the invention, soluble salt and magnetic substances in the waste incineration fly ash can be synchronously separated through washing, washing slag is subjected to second washing when the pH value is 6.5-8.0, and second washing slag is subjected to third washing when the pH value is 0.6-1.5. And step-by-step washing is carried out by controlling different pH values, and all extractable components in the garbage fly ash are respectively concentrated in different sections of washing liquid. According to the method, calcium salt and industrial salt extraction is carried out on the washing filtrate, calcium and heavy metal extraction is carried out on the second washing liquid and the third washing liquid, the final slag is used as a substitute raw material for building material preparation after high-temperature sintering or is directly prepared into building materials, and meanwhile dioxin is thoroughly decomposed during high-temperature treatment. According to the method provided by the invention, the garbage fly ash is completely recycled.

Method of separation of a radiometal ion from a target metal ion, comprising a first liquid-liquid extraction step in which an organic phase comprising an extractant and an interfacial tension modifier is mixed with an aqueous phase comprising the radiometal ion and the target metal ion in order that the radiometal ion is at least partially transferred to the organic phase, followed by a first phase separation step, wherein the phase separation is carried out in flow comprising the use of a microfiltration membrane to separate the phases based on the interfacial tension between the phases such that a permeate phase passes through the membrane and a retentate phase does not.