45results about How to "Reduce tin content" patented technology

The invention discloses a methyltin composite heat stabilizer, which comprises the following components in part by weight: 38 to 68 parts of methyl tin mercaptide, 15 to 25 parts of antimonide based compound, 8 to 12 parts of organic stabilizer of metallic soap, 3 to 5 parts of epoxy compound, 2 to 5 parts of antioxidant, 3 to 8 parts of lubricating agent and 1 to 2 parts of chelant, wherein the methyl tin mercaptide is a composite in which the mass ratio of S,S',S''-tris(isooctyl thioglycollate)-methyltin to S,S'-bis(isooctyl thioglycolate) dimethyltin is 20:80. The methyltin composite heat stabilizer has the advantages of high quality, low toxin, environmental protection, low tin content in the formula, strong practicability and wide application range; and materials prepared from the methyltin composite heat stabilizer, such as PVC sheets, pipes and blown films have the advantages of excellent initial and long-term heat stability, good lubrication system, no precipitation and good oxidation resistance, wherein the sheets and the blown films have good transparency.

The invention discloses a method for preparing iron ore concentrate for ironmaking from tin-containing iron ore. The method comprises the following steps: mixing the tin-containing iron ore and a sodium carbonate additive according to a certain ratio, agglomerating, drying, and performing reducing roasting under proper temperature and reducing roasting atmosphere; and separating magnetite concentrate by combining an ore grinding-magnetic separating method, and filtering and separating sodium stannate solution and filter residues from remaining nonmagnetic matters. The method is simple in process flow, mild in process conditions, low in cost and environmental friendly, particularly effective separation between tin and iron in the tin-containing iron ore is realized, the iron recovery rate is high, the content of tin in the obtained iron ore concentrate is low, and the iron ore concentrate can serve as a raw material during blast furnace ironmaking.

The invention belongs to the technical field of solid waste treatment, and specifically discloses a comprehensive recovery method for smelting soot from waste circuit boards. In this recovery method, alkali is first added to smelting soot for pressure leaching, and metal bromide and chloride salts in the soot are converted into hydroxide precipitates, while bromine and chlorine are converted into soluble NaBr and NaCl respectively, realizing bromine, Chlorine is separated from valuable metals, and then the filtrate is evaporated and crystallized to obtain crude salt products. The filter residue is reduced and roasted, and the zinc in the residue is recovered through volatilization to obtain a higher-purity zinc oxide product. After that, the calcined sand is further heated and smelted to obtain metal Ingots and harmless reducing slag. The method for comprehensively recovering waste circuit board smelting soot provided by the invention can effectively recover bromine, chlorine and valuable metals in waste circuit board smelting soot.

The invention provides a harmless treatment method for recycling valuable metal and arsenic resources from arsenic-containing smoke. All valuable elements are recycled and utilized through the procedures of carrying out oxygen pressure leaching via caustic alkali; carrying out selective reduction purification on leachate; during purification, carrying out hydrogen reduction and vacuum distillation on obtained crude tellurium so as to obtain high-purity tellurium; after purification, obtaining a pure sodium arsenite solution, and using the solution for the arsenic salt purification of a zinc sulfate solution so as to remove cobalt and nickel; carrying out fluidization washing on leaching residues; after washing, solidifying arsenic in the solution, and carrying out reduction smelting on the residues; and carrying out oxidization blowing and the like. The arsenic is removed from the smoke, stibium, lead, bismuth, stannum and the like are kept in the residues from which the arsenic is removed as much as possible, and the deep separation of the arsenic and the stibium is realized. The obtained pure sodium arsenite solution is used for the arsenic salt purification of the zinc sulfate solution used for wet-process zinc smelting so as to remove the cobalt and nickel raw materials, part of sodium arsenate with high impurity content is solidified, the arsenic is precipitated, the harmless recycling of the arsenic resource is realized, and the valuable elements, such as the tellurium, the stibium, the lead and the bismuth are recycled. The comprehensive utilizing rate of the resources is high, the application range of the raw materials is wide, and a pollution problem in the extracting process of a traditional technology is solved.

The invention belongs to the technical field of solid waste treatment, and specifically discloses a harmless recycling method for smelting soot from waste circuit boards. The recovery method first adds alkali to the smelting soot for roasting, and converts the metal bromide and chloride salts in the soot into water-insoluble metal oxides, and the bromine and chlorine elements form water-soluble sodium bromide and sodium chloride, and the soot after roasting After water immersion and filtration, the separation of bromine, chlorine and valuable metals is realized. Bromine and chlorine mainly enter the solution, and then the crude salt product is obtained through evaporation and crystallization, and then the filter residue is reduced and roasted, and the zinc element in the residue is recovered by volatilization. , to obtain a higher purity zinc oxide product, and then the calcine is further heated and smelted, and the metal oxide is reduced to produce metal ingots and harmless reduction slag. The waste circuit board smelting soot treatment method provided by the invention can effectively separate bromine and chlorine in the waste circuit board smelting soot, and can simultaneously remove organic matter in the soot, and effectively recover bromine, chlorine and valuable metals.