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

Abstract

The invention belongs to the technology of comprehensive recycling of complex nonferrous metal secondary resources, and particularly relates to an enrichment and separation method of cadmium in waste circuit board multi-metal hybrid resources. The method includes the steps that firstly, a multi-metal complex mixture containing cadmium is obtained from a waste circuit board through smashing and sorting; a separating agent is added into the multi-metal complex mixture; the prepared multi-metal complex mixture is placed in a graphite crucible of a vacuum furnace; after the metal mixture is completely melted, trapping agent lead and a trace enrichment reagent are added; and cadmium is selectively enriched in a lead liquid phase, a separation melt with liquid copper on the upper layer and liquid lead on the lower layer is formed, and the liquid copper on the upper layer and the liquid lead trapping cadmium on the lower layer are poured out respectively. Thus, cadmium is separated from the multi-metal complex mixture of the waste circuit board and is further recycled. The method is simple and easy to implement and has the characteristics of being low in cost, comprehensive, efficient, free of pollution and the like.

Description

technical field [0001] The invention belongs to the comprehensive recycling and reuse technology of secondary resources of complex nonferrous metals, specifically a method for enriching and separating cadmium 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 e...

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

If the cadmium element in the polymetallic mixture of waste circuit boards is not handled properly, on the one hand, it will cause great harm to humans, animals and plants, such as excessive cadmium in groundwater, soil, food, etc.; on the other hand, valuable secondary non-ferrous metal resources will be lost. Failure to recycle and recycle, resulting in waste of resources