Method for producing copper sulphate by using copper-containing waste solution of PCB circuit board plant

Abstract

A method for producing copper sulphate by using a copper-containing waste solution of a PCB circuit board plant comprises the following steps: removing impurities of the copper-containing waste solution, removing impurities of a cuprammonium waste solution, preparing wet alkaline copper, preparing a slurry from wet alkaline copper and an alkaline copper mother solution or tap water, acidifying, cooling, crystallizing, and purifying. In the method, copper oxychloride is taken as an intermediate, because copper oxychloride is in the state of a particle, copper hydroxide is in the state of a slurry and synthesis of copper oxychloride is under a high-temperature condition, when solid-liquid separation is performed, separation of the copper oxychloride intermediate from impurities, oil stains and the like is relatively thorough. In the subsequent technological flow, influence of impurities on the copper sulphate product quality is reduced, under the circumstance of guaranteeing product quality, the pH value of the acidification terminal point is 1.0-1.5, and the terminal-point acidity is obviously raised compared with an original technology (pH: 0-0.3). By using the method, the wastewater quantity is reduced, product quality is improved, and sulfuric acid consumption is reduced.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for producing copper sulfate with copper-containing waste liquid from a PCB circuit board factory. Background technique [0002] Using copper-containing waste liquid and copper ammonia waste liquid from PCB circuit board factory as raw materials, neutralize and filter to obtain copper hydroxide (more impurities), after washing, use copper hydroxide as an intermediate, mix with copper sulfate mother liquor and tap water , after mixing the slurry according to a certain ratio, carry out acidification, cooling and crystallization to obtain copper sulfate pentahydrate crystals. [0003] This method has the following disadvantages: [0004] 1. Copper hydroxide is in the form of slurry, and it is difficult to wash with water. In order to ensure product quality, it is necessary to increase the amount of washing water, resulting in a large amount of waste water; [0005] 2. Cop...

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Problems solved by technology

[0004] 1. Copper hydroxide is in the form of slurry, and it is difficult to wash with water. In order to ensure product quality, it is necessary to increase the amount of washing water, resulting in a large amount of waste water;

[0005] 2. Copper hydroxide is used as an intermediate, and there are many impurities in copper hydroxide, which affects product quality, and the product quality is poor and unstable;

[0006] 3. Contains some organic matter, consumes part of sulfuric acid during acidification, resulting in high acid consumption

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