Enrichment and separation method of bismuth element in multi-metal mixed resources of waste circuit boards

Abstract

The invention belongs to the comprehensive recycling technology of a complex secondary resource of non-ferrous metal, in particular to a method for enriching and separating bismuth elements in a polymetallic mixed resource of waste printed circuit boards. The method comprises the following steps: firstly, after the waste printed circuit boards are crushed and sorted, obtaining a polymetallic complex mixture containing the bismuth elements; adding a separating agent in the polymetallic complex mixture, and putting the prepared polymetallic complex mixture in a graphite crucible of a vacuum furnace; after the metal mixture is completely melted, adding a lead trapping agent, then adding a trace of enrichment agent, therefore enabling the bismuth elements to be selectively enriched into a lead liquid phase, and enabling a melt in the crucible to generate liquid phase layering to form a separated melt with liquid copper on the upper layer and liquid lead on the lower layer; respectively pouring out the upper-layer liquid copper and the lower-layer liquid lead trapped with the bismuth elements. Thus, bismuth is separated from the polymetallic complex mixture of the waste printed circuit boards and is recycled. The method is simple and easy and has the characteristics of low cost, integrated high efficiency and no pollution.

Description

technical field [0001] The invention belongs to the comprehensive recycling technology of secondary resources of complex nonferrous metals, specifically a method for enriching and separating bismuth elements in multi-metal mixed resources of waste circuit boards, and relates to the recycling and regeneration of electronic waste in the technical field of environmental protection And comprehensive and efficient resource utilization technology will help to solve the harm of electronic waste to the ecological environment and alleviate the pressure of the shortage of non-ferrous metal resources in my country. Background technique [0002] With the continuous innovation of science and technology and the upgrading of electronic and electrical products, a large number of discarded electronic products have become the fastest growing and most difficult type of solid waste. Electronic waste, also known as electronic waste, includes all kinds of waste computers, communication equipment, ...

AI Technical Summary

Problems solved by technology

However, this method has low leaching efficiency and limited effect on some metals, especially the metal elements wrapped in ceramics cannot be recovered; the disadvantage of this technology is that the consumption of chemical reagents is large, and at the same time it produces a large amount of corrosive and toxic elements. As well as the waste liquid and waste residue of heavy metal ions, it is easy to cause secondary pollution

However, there is currently no reasonable method for the enrichment, separation and recycling of bismuth in the polymetallic mixture of discarded circuit boards.