Smelting slag type method for extracting metal copper from hazardous waste

• Main Authors: SHEN LONGHAI, MA AIJUN, PAN ZHI, LI YUHANG, ZHAO GUOBIN, WANG XINGNIAN, QIAN WEIDONG
• Format: Patent
• Language: Chinese; English
• Published: 02.05.2023
• Subjects: CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; METALLURGY; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention relates to a slag type smelting method for extracting metallic copper from hazardous waste, which utilizes low-grade low-calorific-value copper-containing sludge and valuable metals in electroplating waste and the like to better separate from slag, and comprises the following steps: drying and sintering/briquetting raw materials, putting the block-shaped materials into a side-blown furnace together with fuel and a solvent for smelting, in the smelting process, a calcium-containing flux and a silicon-containing flux are added according to the ratio of FeO to SiO2 being 0.4-0.5 and the ratio of SiO2 to CaO being 1-1.2 to regulate and control the composition of the slag. According to the slag type provided by the invention, the temperature, the density, the viscosity and the surface tension of the slag can be effectively controlled, so that valuable metals are better separated from the slag, and the valuable metals in the hazardous waste sludge can be recovered to the maximum extent; in the smeltin