A kind of production method of utilizing acidic copper-containing etching waste liquid to produce electroplating grade copper sulfate

Abstract

The invention discloses a producing method for producing electroplating grade copper sulfate with acid copper-bearing waste etching liquid. The method comprises the steps of allowing clear water, or a copper oxide production mother solution, or a copper sulfate production mother solution to react with the acid copper-bearing waste etching liquid and mixed alkaline liquid to produce high-purity copper oxide, controlling the temperature of a reaction system to be 70-90 DEG C, and a pH (potential of hydrogen) value to be 8.5-9, adding prepared high-purity copper oxide and concentrated sulfuric acid into the clear water or an electroplating grade copper sulfate production mother solution, controlling the reaction pH value to be 0.1-3, and obtaining electroplating grade copper sulfate, wherein the mixed alkaline liquid is mixed by strong alkali and weak acid salt and strong alkali at a mass ratio of 1:6-1:8. The producing method is simple in technology and low in cost, a product reaches an electroplating grade and can be produced continuously, and no ammonia nitrogen is introduced, so that the subsequent processing procedure is reduced.

Description

technical field [0001] The invention belongs to the field of waste liquid recovery and utilization, and in particular relates to a production method for producing electroplating-grade copper sulfate by utilizing acidic copper-containing etching waste liquid. Background technique [0002] The copper resources in the copper-containing etching waste liquid of circuit boards are mainly recycled in the form of copper salts. The common recycling method is to directly produce basic copper chloride or copper carbonate. The recovery of copper sulfate generally requires several steps. to complete. Chinese patent ZL200710030323.5 discloses a method for producing copper sulfate from copper-containing etching waste liquid. First, the acidic etching waste liquid and alkaline etching waste liquid are reacted to form basic copper chloride, and the basic copper chloride is then oxidized with hydroxide. The sodium solution is reacted to produce copper oxide, which is then reacted with concen...

AI Technical Summary

Problems solved by technology

The content of chloride ions in the copper sulfate product prepared through three reaction steps will be high, and the ammonia nitrogen content in the wastewater generated during the reaction process will also be high, resulting in large energy consumption and high production costs.

Using the existing technology of producing copper sulfate through two steps, the copper sulfate product produced can only meet the feed grade standard

Images