49 results about "Calcium sulphide" patented technology

The invention relates to a method for removing iron and silicon impurities during the regeneration of aluminum scraps, belonging to the field of impurity removal during the regeneration and recovery of non-ferrous metals. The method comprises the steps of putting 20-30% of borax, 20-30% of manganese chloride, 10-20% of calcium chloride, 10-20% of calcium oxide, 5-10% of magnesium carbonate, 5-10% of sulfur and 10-20% of filler into a stirring vessel, and mixing, so as to obtain iron removing flux; putting 30-50% of calcium sulfide, 20-40% of activated carbon, 5-10% of sulfur, 10-20% of calcium oxide and 10-20% of filler into a stirring vessel, and mixing, so as to obtain silicon removing flux; melting the aluminum scraps in a melting furnace, adding the iron removing flux into aluminum scrap molten liquid, stirring the aluminum scrap molten liquid, adding the silicon removing flux, stirring, and then, standing, so as to obtain aluminum scrap molten liquid; carrying out gas-blowing refining on the aluminum scrap molten liquid, and standing, thereby obtaining aluminum scrap melt in which iron and silicon impurity elements are removed. The method has the advantages that the yield of aluminum can not be affected, and the content of the iron and silicon impurity elements is lowered remarkably; the environment is not destroyed; the steps are simple.

The invention provides a repairing agent for heavy-metal-polluted soil and a resource recycling method of construction waste. The soil repairing agent comprises 40-60% of a construction waste treatment material, 10-20% of silica sol, 5-10% of humic acid and 10-45% of metallothionein; the construction waste treatment material is prepared through the following steps that the construction waste is broken into powder and then screened by a 1200-mesh molecular screen, a citric acid water solution is added and then stirring is conducted for one hour or more, then calcium polysulfide is added and then stirring is conducted for four hours or more, after a mixed solution is screened by the 1200-mesh molecular screen, still standing is conducted to subside, water is pumped out, sediments are dried, and after grinding, the construction waste treatment material is prepared. According to the repairing agent of the heavy-metal-polluted soil and the resource recycling method of the construction waste, resource recycling of the construction waste is achieved for the first time, and on the one hand, environment pollution can be effectively reduced, and waste treatment cost can be effectively lowered; and on the other hand, preparing cost of the prepared construction waste treatment material is remarkably lowered, the repairing property cannot be lowered, or the repairing time cannot be prolonged.

The inventi on discloses a method for extracting sodium carbonate and sodium thiocyanate from sodium alkali desulfurization liquid waste by using a causticization-acidification method and belongs to the technical field of desulfurization liquid waste treatment. The method comprises the following processes: pertreating liquid waste for removing impurities, heating for decomposing and discoloring, and carrying out oxidizing causticization-separation, acidification-separation, evaporation and concentration, and cooling crystallization-separation. The method is used for treating the desulfurization liquid waste generated in a production process of removing hydrogen sulfide and hydrogen cyanide out of coal gas or other gases by using a sodium alkali method. According to the method provided by the invention, sodium thiosulfate, sodium polysulfide and sodium sulfate in the sodium alkali desulfurization liquid waste can be converted into calcium sulfite, calcium sulphide and calcium sulfate precipitations at normal temperature through heating decomposition, oxidization and causticization; meanwhile, high-purity sodium carbonate and sodium thiocyanate are extracted, the sodium alkali is recovered to return a gas desulfurization system cycle, and the alkali consumption of the desulfurization operation is reduced.