Zhengzhou Zhengyang Machinery Equipment Co., Ltd

How to extract and recycle precious metals from scrap circuit boards

2021-09-13

Waste circuit boards are a kind of highly hazardous solid waste. Unscientific treatment methods are bound to cause serious harm to the biosphere. The waste circuit boards are rich in precious metals such as gold, silver, palladium, and platinum, which contain huge amounts of precious metals. wealth. The structure of discarded circuit boards is extremely complex, making it difficult to recycle. However, the types of substances contained in them are similar, that is, they contain a large amount of ferrous metals, non-ferrous metals, precious metals and resins, and the physical properties of these substances There are certain differences in chemical properties, and based on these differences, at present, both domestic and foreign countries attach great importance to the recycling of discarded circuit boards.

Precious Metal Refining Machine

Precious Metal Refining Machine

The dry crushing electrostatic separation of the circuit board recycling equipment makes the separation more refined and effective, and effectively controls the loss of non-ferrous metals. The full set of production lines are equipped with high-level bridges and guardrails to facilitate real-time monitoring and maintenance of equipment by maintenance personnel. The crushing equipment is equipped with a hydraulic system to facilitate the replacement of wearing parts and improve work efficiency.

Circuit board recycling equipment is a set of processes that disassemble and decompose scrap circuit boards into metal and non-metal. After the circuit board with electronic components is stripped and disassembled, the components are removed (the components are classified and processed separately). The circuit board completes the dissociation of metal and non-metal through coarse crushing, iron removal, and fine crushing, forming a mixture of metal and non-metal, and entering the airflow specific gravity screen to extract most of the metal. The circuit board fiber powder sieved by the specific gravity of the airflow contains a small amount of fine metals (about 2-5% content), and then enters the electrostatic separator to extract the remaining fine metals, and the metal recovery rate can be as high as 99%.

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