open access

https://hdl.handle.net/2115/79195

Improvement of Copper Metal Leaching in Sulfuric Acid Solution by Simultaneous Use of Oxygen and Cupric Ions

英語

sulfuric acid

2020-06

MDPI

Metals

10(6)

721

A new concept for copper (Cu) metal leaching by the simultaneous use of cupric ions (Cu2+) and oxygen (O-2) was proposed to improve Cu metal leaching in sulfuric acid. According to this concept, Cu(2+)oxidizes Cu metal into cuprous ion (Cu+), and O(2)oxidizes Cu(+)into Cu2+. The improvement in Cu leaching efficiency from Cu metal was investigated experimentally in the sulfuric acid solution using Cu(2+)and O(2)simultaneously. Furthermore, the result was compared with that for the sulfuric acid solution containing neither Cu(2+)nor O(2)and with the sulfuric acid solution without Cu(2+)and O-2. When both Cu(2+)and O(2)were used in the leaching solution, the leaching rate of Cu from Cu metal powder was higher than at other leaching conditions, and the leaching efficiency of Cu increased to more than 99.9% in 1 mol/L sulfuric acid solution at 400 rpm and 50 degrees C with <= 75 mu m Cu metal powder, 1% pulp density, 10,000 mg/L initial Cu(2+)concentration, and 100 cc/min O(2)introduction. These results indicated that the leaching of Cu from Cu metal could be accelerated by adding Cu(2+)and O(2)in the sulfuric acid solution.

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