A method for combined removal of impurities by separation and smelting of waste circuit board copper powder

Abstract

A method for removing impurities by selecting and smelting waste circuit board copper powder. Waste circuit board copper powder is leached in a hydrochloric acid solution to selectively leach aluminum and iron in it, and the dealuminated slag is then leached out lead and tin by controlled potential oxidation. The leaching slag adopts hydrocyclone separation to separate alumina and silica and produce high-quality pyrometallurgy raw materials. The essence of the present invention is to firstly adopt the process of combining two-stage wet selective leaching and ore dressing and sorting to process the copper powder of waste circuit boards, which not only selectively removes impurity metals such as aluminum, lead, tin, etc., but also separates the oxidized Aluminum and silicon dioxide can finally realize the enrichment of copper, which solves the harm of impurity metals and organic matter when pyromelting and recycling waste circuit board copper powder.

Description

technical field [0001] The invention relates to a hydrometallurgical process in the field of nonferrous metallurgy, in particular to a hydrometallurgical method for treating waste circuit board copper powder by adopting a combined separation and metallurgy method. Background technique [0002] In recent years, people's production and life have been inseparable from electronic and electrical equipment. With the development of the electronics industry, the advancement of technology and the expansion of the market, the upgrading speed of electronic and electrical equipment has accelerated, resulting in the use time of electronic and electrical equipment being far shorter than the actual service life of the product, which makes waste electric and electronic equipment (Waste Electric) and Electronic Equipment, WEEE) rapid growth (RAHMANI M, NABIZADEH R, YAGHMAEIAN K, MAHVI A H, YUNESIAN M. Estimation of waste from computers and mobile phones in Iran[J].Resources, Conservation and...

AI Technical Summary

Problems solved by technology

In the pyrometallurgical copper smelting process, tin, lead, zinc, aluminum and other metals in the copper powder of waste circuit boards will disperse into slag, flue gas and copper matte, which not only reduces the recovery rate of copper, but also affects the quality of cathode copper. Will affect the stability of the copper smelting system

At present, there are few studies on the separation and recovery of these metals. In the process of recycling waste circuit board copper powder, they are often regarded as impurity metals and removed, resulting in the waste of these valuable metal resources.

In addition, the substrate of waste circuit boards contains a large amount of organic matter. Due to insufficient dissociation during the mechanical pretreatment process, some metals are still wrapped by organic matter such as epoxy resin and flame retardants, which will produce diphenyl dioxins and Toxic and harmful gases such as diphenylfuran have caused great pollution to the environment (PENG Ya-qi, CHEN Jing-hao, LU Sheng-yong, HUANG Jian-xin, ZHANG Meng-mei, BUEKENS A, LI Xiao-dong, YAN Jian -hua. Chlorophenols in Municipal Solid Waste Incineration: A review[J]. Chemical Engineering Journal, 2016, 292: 398-414.)

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