Method for extracting gold, silver and copper from various waste circuit boards

Abstract

The invention provides a method for extracting gold, silver and copper from various waste circuit boards, and relates to the field of industrial waste regeneration, in particular to the method for extracting gold, silver and copper from the various waste circuit boards. The method for extracting the gold, silver and copper from the various waste circuit boards comprises the following raw materialsby weight of 190 to 210 kg of a mixture of various metals, 2800 to 3000 L of first extraction liquid, 900 to 1100 L of second extraction liquid, 45 to 55 kg of ordered mesoporous carbon and 180 to 520 L of third extraction liquid. The method comprises the following steps of feeding 1 ton of various waste computer boards into a turbo-type pulverizer, pulverizing the boards into 0.5 mm fine powder,and separating out resin through an airflow sorting machine and a dry electrostatic sorting machine to obtain various metal mixtures; adding the various metal mixtures into the first extraction liquid, and extracting copper and silver; adding the second extraction liquid and the ordered mesoporous carbon into the residual solid, reacting for a period of time, and filtering out the ordered mesoporous carbon adsorbed with the gold; and adding the ordered mesoporous carbon adsorbed with the gold into the third extraction liquid for washing, filtering out the ordered mesoporous carbon (recycled next time), standing the filtrate to precipitate the gold, and performing purifying.

Description

[0001] The invention relates to the field of industrial waste regeneration. A method of extracting gold, silver and copper from various discarded circuit boards. Background technique [0002] With the rapid development of the economy, the speed of e-waste generation in China is astonishing in recent years, and my country has become the second largest producer of e-waste in the world. Waste circuit boards, waste electronic waste, waste computer CPU, waste mobile phones and other electronic waste can be seen everywhere, becoming a valuable "urban mine". It is understood that the current social ownership of TV sets in my country has reached 350 million sets, 130 million sets of refrigerators, and 170 million sets of washing machines. At present, there are about 8 million computers and 15 million mobile phones entering the phase-out period. Such a huge amount of electronic waste provides sufficient raw materials for refining gold, which contains huge economic benefits. On the o...

AI Technical Summary

Problems solved by technology

Disadvantages: It is difficult to extract a small amount of gold in a variety of metal mixtures, the recovery rate is low, and the working environment is poor

Disadvantages: high cost, slow speed, waste acid is not easy to handle

Disadvantages: high toxicity, dangerous operation, high cost; drugs are controlled substances, difficult to purchase

[0010] According to data from the Ministry of Industry and Information Technology, the weight of electronic products scrapped in my country exceeds 5 million tons every year, and the recovery rate is less than 10%.

[0011] The use of traditional treatment methods not only caused the loss of various metal resources, but also produced toxic and harmful gases that caused serious harm to the environment on which human beings depend.