Method and system for preparing ferric chloride, electrodeposited copper and copper powder from copper-containing hydrochloric acid waste liquid

Abstract

The invention provides a method and a system for preparing ferric chloride, electrodeposited copper and copper powder from copper-containing hydrochloric acid waste liquid. The system comprises a first liquid storage tank, a stirring reactor, a filter, a chlorine absorption tank, a caustic soda solution absorption tower, a solution adjusting tank, an electrodeposition cell and an exhaust fan, wherein the first liquid storage tank is used for storing the copper-containing hydrochloric acid waste liquid; the stirring reactor is used for carrying out replacement reaction between ferrum and copper chloride; the filter is used for filtering a solution obtained through the replacement reaction; the chlorine absorption tank is used for enabling the solution filtered by the filter to absorb chlorine, so that ferrous chloride is oxidized into ferric trichloride; the caustic soda liquid absorption tower is used for treating tail gas emitted from the chlorine adsorption tank; the solution adjusting tank is used for adjusting the concentration of a solution in the electrodeposition cell; the electrodeposition cell is used for an electrodeposition reaction; and the exhaust fan is used for conveying chlorine gas produced by the electrodeposition cell to the chlorine absorption tank. According to the method and the system provided by the invention, replacement of copper ions from ferrous powder is combined with the electrodeposited copper, so that the wastewater discharge problem of the copper-containing hydrochloric acid waste liquid and the pollution problem of the chlorine gas to the environment can be solved, and the phenomenon that the power consumption sharply rises is avoided.

Description

technical field [0001] The invention relates to an industrial waste liquid treatment technology, in particular to a method and a system for preparing ferric chloride, high-purity electrodeposited copper and copper powder from hydrochloric acid copper-containing waste liquid. Background technique [0002] Hydrochloric acid copper-containing waste liquid is mainly produced in the pickling process of copper and copper alloys and the acid etching process of printed circuit boards. The main components of the waste liquid produced by these processes are hydrochloric acid and copper chloride, and part of the waste liquid contains sodium chloride or ammonium chloride. The copper ion content is generally 20-250g / l, and the free hydrochloric acid concentration is generally 0.5-6mol / l. The conventional treatment methods for this waste liquid are neutralization method and electrowinning method. The neutralization method usually has the problem of solution effluent pollution, and the e...

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Problems solved by technology

[0009] The purpose of the present invention is to provide a method and system for preparing ferric chloride, high-purity electrodeposited copper and copper powder with hydrochloric acid copper-containing waste liquid, so as to solve the pollution problem of waste liquid after copper extraction in the prior art and the resulting Chlorine gas cannot be effectively used to pollute the environment, the added value of the product is not high, resulting in poor economic benefits and no promotion value, and the current efficiency decreases after the content of copper ions decreases, and the power consumption increases sharply, etc.

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