Method for transforming aqueous solution containing copper chloride into copper powder and polyaluminum chloride (PAC)

Abstract

The invention relates to a method for transforming an aqueous solution containing copper chloride into copper powder and polyaluminum chloride (PAC). The method comprises the following steps of: diluting the aqueous solution containing copper chloride serving as a raw material with water till the concentration of [Cu2+] is 40-60 g / L; undergoing a displacement reaction by using a high-purity aluminum sheet, wherein the reaction temperature is set at 70-80 DEG C during the reaction; when the pH value of the solution is below 1.0, separating the copper powder from solution to obtain high-quality copper powder; increasing the reaction area of the solution from which the copper power is further extracted by using different aluminum materials; raising the reaction temperature to about 90 DEG C to replace impurities and the like out; and filtering to obtain high-purity PAC.

Description

technical field [0001] The invention relates to a method for converting waste liquid containing copper chloride aqueous solution into copper powder, in particular to a production method capable of producing high-quality copper powder and high-purity polyaluminum chloride. Background technique [0002] In today's industry, the amount of electroplating waste liquid, micro-etching waste liquid and etching waste liquid produced by the printed circuit board manufacturing industry and electroplating industry is very large. The main components of these waste liquids include Cu 2+ , Cl - or SO 4 2- etc. If it is not handled effectively, it will have a significant impact on the environment. [0003] The traditional treatment method is to treat with hydroxide chemical precipitation or sulfide chemical treatment, but it can't get good results, and at the same time, a large amount of sludge is produced, which is not conducive to subsequent treatment. [0004] Taiwan Patent Publicati...

AI Technical Summary

Problems solved by technology

However, in the above-mentioned method for producing copper and deriving polynary aluminum chloride, in the actual production process, there will be long processing time and poor reaction, and the generated polynary aluminum chloride has the problem of high copper content ( The residual copper content is about 0.3~5.0g / L), which leads to the instability of recycling; thus causing:

[0007] 1. Copper powder has high impurities: the content of chlorine (Cl) is too high (300-500ppm), it can only be used in melting furnaces, and it needs to be reprocessed to produce high-order chemical copper

[0008] 2. The application range of the produced polyaluminum chloride (PAC) is limited, and the content of copper (Cu) and iron (Fe) is high, so the industrial bureau limits it to be used only for sewage treatment, and cannot be used for tap water purification. potion

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