46results about How to "Realize full resource utilization" patented technology

The invention discloses a technology of producing high-activity steel slag powder and an inert mineral product by using steel slag. The technology comprises the six steps of dry process grinding, pneumatic separation, dry process magnetic separation, wet process grinding, wet process magnetic separation and dehydration. In the step of the dry process grinding, tailings after slag iron are recovered are ground into steel slag powder, and inert mineral dissociation is realized; in the step of the pneumatic separation, the steel slag powder is subjected to size grading by using a superfine powder concentrator, so that the enrichment of inert minerals in coarse powder is realized, and fine powder is a high-activity steel slag powder product; in the step of the dry process magnetic separation, the coarse powder is purified to be coarse concentrate by employing the magnetism of the inert minerals, and coarse tailings return back to the dry process grinding step; the coarse concentrate is made into fine pulp through the wet process grinding; the fine pulp is separated into a humid inert mineral raw material and a humid cement iron raw material through the wet process magnetic separation; and after the humid inert mineral raw material and the humid cement iron raw material are dehydrated separately, the inert mineral product and a cement iron raw material are obtained, and water returns to the wet process grinding step. According to the technology, the steel slag is processed into the high-activity steel slag powder, the high-iron-grade inert mineral product and the cement iron raw material, so that the full resource utilization of the steel slag is realized.

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 discloses a low-carbon and high-efficiency full-resource clean recovery method of waste circuit boards. The method is to place the waste circuit boards in a pyrolysis furnace, and feed oxygen and gas into the pyrolysis furnace to perform insufficient oxygen deficiency. Combustion provides a heat source and atmosphere for the pyrolysis of waste circuit boards, controls the temperature in the pyrolysis furnace to continue to rise, the solder is recovered in liquid form, the pyrolysis slag is enriched at the bottom of the furnace, the pyrolysis gas is recovered from the top of the furnace, and the pyrolysis gas is recovered through condensation After the oil is pyrolyzed, the condensed residual gas is washed with lye and returned to the pyrolysis furnace as gas. This method is simple to operate, low in energy consumption, and can realize low-carbon, high-efficiency, and full-resource clean recycling of waste circuit boards.