Technique for short-range preparation of electrolytic copper foil from copper sulfate solution in wet smelting process

Abstract

The invention provides a technique for short-range preparation of electrolytic copper foil from copper sulfate solution in wet smelting process. The technique comprises the following steps: (1) leaching copper with sulfuric acid; (2) copper extraction; (3) deep oil removal; (4) removal of impurities from resin; (5) crystallizing step by step; (6) preparation of electrolyte; (7) preparation of copper foil: preparing the copper foil from the electrolyte to obtain raw foil and waste acid, and returning the waste acid to step (1) after deacidification by a membrane technology. The technique has the beneficial effects that the traditional technique of copper foil preparation by electrolytic copper, wire drawing, dissolution and electrodeposition is overturned, the wet smelting copper electro-deposition process is cancelled, and the preparation processes of electrolytic copper melting, ingot casting and wire drawing are omitted; and the technique adopts step-by-step crystallization and returning of mother liquor for copper extraction, and the problem that the copper-acid ratio in smelting process cannot meet copper foil production is solved.

Description

technical field [0001] The invention relates to the technical field of electrolytic copper foil, in particular to a process for short-range preparation of electrolytic copper foil using a copper sulfate solution in a hydrometallurgy process. Background technique [0002] Electrolytic copper foil is an important material for the manufacture of copper clad laminates (CCL), printed circuit boards (PCB), and lithium-ion batteries. In the rapid development of today's electronic information industry, electrolytic copper foil is called the "neural network" of electronic product signal and power transmission and communication. The production process of electrolytic copper foil is simple, and there are three main processes: solution raw foil, surface treatment and product cutting. Copper smelting methods can be divided into two categories: pyrometallurgy and hydrometallurgy. More than 85% of the world's refined copper production is recovered from copper sulfide concentrate and recy...

AI Technical Summary

Problems solved by technology

The traditional electrolytic copper foil production process includes electrolytic copper, wire drawing, dissolution and then electrodeposited foil. Electrolytic copper needs to go through the copper wire preparation process of melting, ingot casting, and wire drawing. The production process is complicated and the process is long, which cannot meet the requirements of copper foil production. Acid ratio requirements

Sulfuric acid will gradually accumulate in the production of raw foil, and the direct discharge of this part of waste acid will cause environmental pollution. How to properly dispose of it is a difficult problem

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