6results about How to "Efficient and selective separation" patented technology

The invention relates to a method for recovering valuable metal nickel, cobalt and manganese from waste battery black powder in one step, which comprises the following steps of: removing Cu and Mn powder from a waste battery black powder leaching solution by a chemical method, removing Zn by a replacement method, and removing Fe and Al by an oxidation method to obtain a solution without Cu, Zn, Fe and Al; the pH value of the solution after Cu, Zn, Fe and Al are removed is adjusted to 3.0-3.5 through dilute sulphuric acid, battery black powder extraction pre-liquid is obtained, and the battery black powder extraction pre-liquid is subjected to DY-319 full extraction, so that the Ni-Co-Mn composite solution is obtained. The method is simple in process and short in flow, and new impurity elements are not introduced. And 2, by adopting the method disclosed by the invention, the extraction separation effect is good, the recycled Ni-Co-Mn composite solution can be directly used for producing the ternary positive electrode material, and the recycling of valuable metals in the waste battery black powder is realized. Meanwhile, less wastewater and waste residues are produced, and environmental pollution is reduced.

The application provides a carbonyl sulfur removal method and a carbonyl sulfur removal device. A complex promoter is introduced in the carbonyl sulfur removal process, and the complex promoter comprises a main promoter and an auxiliary promoter. The main promoter comprises a quaternary ammonium salt compound and / or a cyclic ether compound, and the auxiliary promoter comprises a sulfonate surfactant and / or a glycoside surfactant. The application can realize efficient and selective removal of carbonyl sulfur under the conditions of near normal temperature (1-21 DEG C) and low pressure (0.1-6.0 MPa), can improve the removal rate, reduce the loss of effective gas, eliminate secondary pollution, and can meet the actual needs of industrial continuous operation.

The invention provides a rare earth element multi-stage classification recovery method, which mainly utilizes humic acid, iron (hydrogen) oxide and inorganic phosphate to carry out multi-stage classification recovery on a fully-distributed rare earth element solution so as to respectively obtain solutions which are relatively rich in light rare earth, medium rare earth and heavy rare earth. The method can effectively separate and purify fully-distributed rare earth ions into a solution rich in light rare earth, a solution rich in medium rare earth and a solution rich in heavy rare earth.

The invention relates to the technical field of hydrometallurgy, and discloses an operation and end point judgment method for reducing gold in a high-selenium chlorination leachate based on ferrite, which comprises the following steps: S1, performing chlorine removal on the high-selenium chlorination leachate; s2, after chlorine removal is finished and the temperature of the high-selenium chlorination leachate is cooled, a ferrite solution is added to the surface of the leachate after chlorine removal, and the reaction potential is monitored; s3, after the reaction endpoint potential drops to a first potential platform, the high-selenium chlorination leachate is rapidly cooled, and coarse gold powder and reduced liquid are obtained through filtering; according to the method, the speed of adding the reducing agent ferrous salt solution into the high-selenium chlorination leaching solution is controlled, the reaction endpoint is judged through potential, gold is reduced firstly, it is avoided that due to excessive ferrous salt, part of selenium, platinum and palladium are reduced, the content of gold in the reduced solution is smaller than 5 mg / L, the reduction rate of gold is larger than 99%, and the reduction rate of selenium, tellurium, platinum and palladium is smaller than 0.05%; and efficient selective separation of gold is realized.

The invention discloses a method for selectively adsorbing copper ions by adopting an aspartic acid silicon-based carbon dot material, and belongs to the technical field of nano material preparation and environmental pollution treatment. A surface-functionalized silicon-based carbon dot material is prepared by heating through a water bath method, the surface-functionalized silicon-based carbon dot material and an acid solution containing copper ions are mixed and subjected to ultrasonic treatment, and the copper ions in the solution are adsorbed by the aspartic acid silicon-based carbon dot material. The surface of the aspartic acid silicon-based carbon dot material is modified by functional groups, the functional groups can be combined with copper ions through coordinate bonds, the specific functional groups are introduced to selectively capture the copper ions for coordination to form a stable chelate, and the aspartic acid silicon-based carbon dot material can expose more adsorption sites and adsorb more copper ions.

The application discloses a preparation method of low-calcium-magnesium strontium-rich water and application thereof. The method comprises the following steps: filtering strontium-containing raw water through quartz sand and activated carbon in sequence, and performing primary nanofiltration separation through a polyamide composite nanofiltration membrane; and then performing secondary nanofiltration separation through a sulfonated polyether sulfone composite nanofiltration membrane. According to the strontium content in the water produced by the secondary nanofiltration, the water can be mineralized through a selective strontium-rich mineralization filter element made of strontium spar, celestite and palygorskite which are sintered and subjected to carbonation treatment. Through the cascade synergistic effect of the two-stage nanofiltration, the application realizes efficient removal of calcium and magnesium ions, and obtains strontium-rich water with a strontium content of 2.0-8.5 mg / L and a significantly reduced calcium, magnesium and chlorine ion content, which can be applied in the fields of medicine, beverage, drinking water or health food.