Method for producing feed-grade bluestone by using cupreous etching waste liquor of circuit board

Abstract

The invention relates to a method for producing feed-grade bluestone by using cupreous etching waste liquor of a circuit board, which is characterized by comprising the following steps of: adding an oxidizing agent or airing air and / or oxygen by mixing cupreous etching waste liquor and / or bluestone mother liquor of an acidic circuit board until the solution is transparent; adding a ferric iron solution while stirring, wherein the adding quantity is metered by the total quantity of the solution obtained in the step (1) and the cupreous etching waste liquor and / or ammonia of the acidic circuit board, and amount of Fe3+ is 2-4kg / m3; adding the cupreous etching waste liquor and / or the ammonia of the acidic circuit board while stirring until the pH value of the solution is 8.-8.5; then, adding2-10kg of active carbon into the obtained solution of each cubic meter; continuously stirring for 30 minutes; then; pressing and filtering; adding sulphuric acid into the filter liquor until the pH value is 4.7-5.7 to obtain alkali type copper chloride or copper hydroxide; and filtering, and dissolving a filter mass by sulphuric acid to obtain a bluestone solution. The needed device of the invention is easy to obtain, and the method of the invention has convenient operation, high arsenic removing rate and low cost.

Description

Technical field [0001] The invention relates to a method for removing arsenic from printed circuit board etching waste liquid used for producing feed-grade copper sulfate and copper sulfate crystal mother liquor. Background technique [0002] Copper sulfate can not only provide the copper required by the normal physiology of animals, but also promote the growth of piglets, so it is widely used in feed. Feed grade copper sulfate has strict requirements on the content of arsenic. [0003] At present, almost all of the feed-grade copper sulfate used as feed additives is produced from the waste liquid of copper-containing etching on circuit boards. There are two types of copper-containing etching waste liquid: acidic waste liquid (commonly known as acid water) and alkaline waste liquid (commonly known as alkaline water). The main components of acid water are copper chloride and hydrochloric acid, and the main components of alkaline water are copper ammonia and ammonia. . The product...

AI Technical Summary

Problems solved by technology

Because the equipment and process of enterprises that use copper-containing etching waste liquid to produce feed-grade copper sulfate are relatively simple, and copper-containing wastewater is different from general wastewater, even when there is ammonia in the copper-containing waste liquid, the pH value of 2.0~ Under the conditions of 7.5, there will be precipitation of basic copper salt or copper hydroxide, and the methods in the reported chemical precipitation methods cannot be directly applied; the materials, processes, and equipment involved in the physical and chemical methods are more complicated, and some are still in the laboratory. experimental stage

For example, the ion exchange method requires the use of ion exchange resins, which is costly and complicated; the adsorption method has only seen laboratory research reports, and further practical research is required for production; the solvent extraction method requires a high selection of extractants. It is non-toxic and easy to extract, and the production involves the use of organic solvents, etc., which are not accepted by general enterprises

Since copper-containing wastewater has a killing effect on organisms, biological methods are not suitable for arsenic removal

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