Driven by the national "dual carbon" strategy and the demand for e-waste resource utilization, Jiangxi Province has issued the "Implementation Plan for Promoting the Recycling and Circular Utilization of Waste Products and Equipment", which requires increasing the application of new resource utilization technologies and improving the recycling volume of major renewable resources by 2027. In response to this policy, Jiangxi Mingxin Metallurgical Equipment Co., Ltd. has upgraded the wet process of its 8,000-ton annual waste circuit board treatment project (approved in 2018) to a dry physical crushing and sorting system, addressing the issues of high water consumption, high wastewater treatment costs and easy secondary pollution in traditional wet processes.
Jiangxi Mingxin's dry crushing and recycling system adopts a "physical crushing + multi-stage sorting" process, and builds a recycling process through nitrogen-protected crushing and intelligent sorting technologies. In the crushing stage, circuit boards are processed to a particle size of less than 2 cm in an inert gas environment. In the sorting stage, combined with vibrating screens, magnetic separation, air separation and eddy current separation, the recovery rate of metals such as copper and aluminum exceeds 95% with a purity of 98%. The system is equipped with fully enclosed negative-pressure dust collection and four-stage exhaust gas treatment devices, resulting in a dust emission concentration of ≤10mg/m³ and non-methane hydrocarbon emission of ≤20mg/m³. Meanwhile, intelligent monitoring ensures production safety. Compared with the wet process, it reduces wastewater discharge by approximately 50,000 tons per year and lowers treatment costs by more than 30%.
Based on an annual treatment capacity of 8,000 tons of waste circuit boards, the system can recover about 1,000 tons of metals such as copper and aluminum, reduce primary mineral mining by 50,000 tons, and save more than 200,000 tons of water resources. The annual output value of recycled metals reaches tens of millions of yuan, with an investment payback period of within 2 years. The Jiangxi Provincial Department of Ecology and Environment stated that this technology meets environmental protection standards, reduces the amount of solid waste landfill, and provides support for the construction of a "zero-waste city" in the region. Currently, Jiangxi Mingxin has laid the foundation for expanding its treatment capacity, and its technological practice provides a reference path for the e-waste recycling industry.
