Method for producing cuprous chloride form deposed copper chloride fluid of etching board

Abstract

A process for preparing cuprous chloride from the used etching liquid of copper chloride includes adding copper oxide to said used etching liquid, filtering, heating the clear solution, stirring while filling SO2 gas, cooling, filtering to obtain crystals, washing with diluted hydrochloric acid and then with alcohol, and drying.

Description

technical field [0001] The invention relates to a treatment method of waste copper chloride etching liquid, in particular to a method for producing cuprous chloride by using waste copper chloride etching liquid. Background technique [0002] Existing waste copper chloride etching liquid usually has four processing methods: one is to replace copper powder with waste copper chloride etching liquid and scrap iron; the second is to use waste copper chloride etching liquid and copper The ammonia etching liquid is used at the same time to produce copper sulfate; the third is to use the waste copper chloride etching liquid to directly evaporate, concentrate and crystallize to produce copper chloride dihydrate; the fourth is to use copper powder to reduce the copper chloride etching liquid to produce chlorine Cuprous oxide. The first is the most direct and simplest treatment method, but the benefit is poor. Because the waste liquid contains a large amount ...

AI Technical Summary

Problems solved by technology

The first is the most direct and simplest treatment method, but the benefit is poor. Because the waste liquid contains a large amount of hydrochloric acid, a considerable amount of iron is wasted in vain, resulting in serious waste; the second is to jointly treat the two waste liquids, but Gained product purity is low, and processing cost is higher; The 3rd kind consumes a lot of energy in the concentration process, and has a large amount of hydrochloric acid to volatilize, both pollutes environment and causes loss again, and the market demand of gained copper chloride dihydrate is few; The 3rd Four kinds are as described in patent 94113822.4. First, the waste copper chloride etching solution and scrap iron are directly replaced to produce copper powder, then water is added to reduce the acid and purified, and the obtained copper powder is reacted with copper chloride etching solution to form cuprous chloride. , due to the need for a large amount of water in the process of generating copper powder, and the hydrolysis of the cuprous chloride complex requires 4-6 times the volume of water, resulting in a great consumption of water resources, and a large amount of water produced in this process Iron-containing waste liquid has increased the burden of environmental protection treatment

[0003] Japanese patent J56155020-A discloses a production method of cuprous oxide, the content of which is: when the copper chloride aqueous solution is eroded to treat the copper plate, the waste liquid discharged is converted into the cuprous chloride aqueous solution, and then the aqueous solution and the alkali solution Simultaneously inject the reactor species, react and generate cuprous oxide under the condition of pH value 8.5-12.5, this method comprises multiple steps, wherein relates to the conversion of waste cupric chloride etching liquid to cuprous chloride, but chlorination Cuprous copper exists in a complex state. If you want to get cuprous chloride products, you need a lot of water. The steps are cumbersome and cause a waste of resources.