Method and device for environment-friendly recovery of precious metal in waste circuit board through combined smelting of waste circuit board, copper concentrate and desulfurized gypsum

Abstract

The invention discloses a method and a device for environment-friendly recovery of precious metals in a waste circuit board through combined smelting of the waste circuit board, copper concentrate anddesulfurized gypsum. The method comprises the following steps of disassembling the waste circuit board, removing impurities such as tin, iron, aluminum and copper wires, crushing, mixing the crushedwaste circuit board with the copper concentrate, copper concentrate auxiliary materials and desulfurized gypsum, and granulating, adding in an Austenite furnace for smelting, wherein the desulfurizedgypsum reacts with other chemical components in the furnace in the smelting process to generate a dioxin inhibitor, thereby inhibiting the generation of dioxin; generating acid-contaminated desulfurized gypsum after the smelted flue gas is subjected to sulfuric acid absorption and acid-contaminated desulfurization and other procedures after waste heat recovery and electric precipitation, returningto a granulation procedure for cyclic granulation, thereby achieving the purpose of recycling the resource. According to the method disclosed by the invention, the dioxin inhibitor can be automatically generated, the problem that dioxin is generated when the waste circuit board and the copper concentrate are mixed and smelted is solved, and meanwhile, acid-contaminated desulfurized gypsum produced in the flue gas smelting and acid making process can be subjected to resource utilization, and the purposes of energy conservation and emission reduction are truly achieved.

Description

technical field [0001] The invention relates to a method and device for jointly smelting waste circuit boards, copper concentrate, and desulfurized gypsum to environmentally friendly recover precious metals in waste circuit boards, and belongs to the technical field of joint development and application of waste in the electronic industry and metallurgical industry. Background technique [0002] With the scrapping of a large number of household appliances, the number of waste circuit boards is increasing. The recycling of waste circuit boards is a new industry. Its recycling value has also attracted the attention of many investors and has become a promising industry. The composition of waste circuit boards is complex, and recycling is difficult. During the combustion process, dioxins are likely to be generated. Dioxin is a special organic compound with strong toxicity, which has become an important factor restricting the recycling of secondary resources containing organic mat...

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Problems solved by technology

[0015] The purpose of the present invention is to solve the problem that the production of dioxin cannot be completely suppressed when the existing waste circuit boards and copper concentrate are smelted and burned to recover valuable metals in a certain proportion, which leads to the fact that the process cannot be practically applied in industrial production, and provides A method and device for environmentally friendly recycling of precious metals in waste circuit boards through joint smelting of waste circuit boards, copper concentrate, and desulfurized gypsum

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