A method for harmless recovery of waste circuit board smelting soot

A technology of discarded circuit boards and recycling methods, applied in the direction of improving process efficiency, etc., can solve problems such as circuit board waste, achieve the effects of improving the properties of slag, reducing metal loss, and improving purity
CN110592385BActive Publication Date: 2021-07-16INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
Publication Date
2021-07-16

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Abstract

The invention belongs to the technical field of solid waste treatment, and specifically discloses a harmless recycling method for smelting soot from waste circuit boards. The recovery method first adds alkali to the smelting soot for roasting, and converts the metal bromide and chloride salts in the soot into water-insoluble metal oxides, and the bromine and chlorine elements form water-soluble sodium bromide and sodium chloride, and the soot after roasting After water immersion and filtration, the separation of bromine, chlorine and valuable metals is realized. Bromine and chlorine mainly enter the solution, and then the crude salt product is obtained through evaporation and crystallization, and then the filter residue is reduced and roasted, and the zinc element in the residue is recovered by volatilization. , to obtain a higher purity zinc oxide product, and then the calcine is further heated and smelted, and the metal oxide is reduced to produce metal ingots and harmless reduction slag. The waste circuit board smelting soot treatment method provided by the invention can effectively separate bromine and chlorine in the waste circuit board smelting soot, and can simultaneously remove organic matter in the soot, and effectively recover bromine, chlorine and valuable metals.
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Description

technical field

[0001] The invention relates to the technical field of solid waste treatment, in particular to a harmless recycling method for smelting soot from waste circuit boards. Background technique

[0002] As an important part of electronic products, circuit boards are widely found in a large amount of electronic waste. In addition, approximately 30%-50% of circuit board waste is formed during circuit board production. As a big country in the production and consumption of electronic products, my country produces at least hundreds of thousands of tons of waste circuit boards every year. Waste circuit boards mainly contain non-metallic materials such as glass fiber, epoxy resin, and plastic, as well as metal materials such as iron, nickel, lead, tin, zinc, gold, silver, and rhodium.

[0003] At present, the treatment technologies for waste circuit boards mainly include pyrolysis technology, hydrometallurgy technology, supercritical fluid technology, microbial technol...

Claims

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