Comprehensive environment-friendly separation process for valuable metals of waste mobile phone circuit board

Abstract

The invention discloses a comprehensive environment-friendly separation process for valuable metals of a waste mobile phone circuit board. The comprehensive environment-friendly separation process comprises the following main procedures: shearing breakage, magnetic separation, hammer milling, screening, wind power selection, electrostatic separation, acid leaching, purification, impurity removal, copper sulfate crystallization, nitric acid separation of silver, nitromurlatic acid separation of gold and platinum-palladium replacement. The comprehensive environment-friendly separation process has the characteristics of advanced process, low cost, high efficiency and remarkable economic, environment-friendly and social benefits, the cyclic utilization of mobile phone resources is realized, valuable metals, plastics and the like are recycled, and thus the earth can be well protected.

Description

technical field [0001] The invention relates to the technical field of resource recovery, in particular to a comprehensive and environmentally friendly separation process for valuable metals from waste mobile phone circuit boards. Background technique [0002] Mobile phone is a widely popular mobile portable electronic device, with a large amount of social ownership and fast replacement. The refurbishment of used mobile phones and the reuse of key components such as mobile phone screens and chips have high economic value. The precious metals such as gold, silver, palladium, and indium contained in mobile phones have high resource value and have a very high recycling value. According to the latest statistical report of the Ministry of Industry and Information Technology, my country's mobile phone users have exceeded 1 billion. Both production and consumption rank first in the world. my country's mobile phone update cycle is gradually shortened, with an average of 12 to 24 m...

AI Technical Summary

Problems solved by technology

However, the transaction of used mobile phones still mostly stays in the mode of manual valuation and recycling by small merchants and hawkers. There are four defects in this mode. First, recycling requires skilled personnel, and it takes a long time to identify the status of mobile phones; Second, the price There is a lot of subjectivity, and the value of mobile phones cannot be accurately assessed; 3. There are risks in fraud and personal safety in the waste mobile phone transaction; 4. The small number of transactions cannot produce scale effects, which hinders the development of the waste mobile phone recycling industry

In view of the inconvenience of manual recycling of waste mobile phones, the recycling rate of waste mobile phones is low, and there is a huge stock of waste mobile phones in society, resulting in serious waste of resources and environmental pollution.

[0004] While the Chinese government has gradually begun to pay attention to and increase the management of the recycling of renewable resources, some problems in the domestic recycling system have also been exposed: about 90% of waste and recyclable products are collected by idle waste purchasers at low prices. Recycling, waste and recyclable products cannot be processed correctly after being purchased, and the processing technology of renewable resources is backward, resulting in low resource utilization efficiency and secondary pollution; there is a lack of processing standards for renewable resources, and some processed products or resources have potential safety hazards