亜鉛精鉱の加圧浸出速度に及ぼす溶液組成および温度の影響

複雑硫化鉱の湿式処理に関する基礎的研究 (第5報)

抄録

Two kinds of zinc sulfide concentrates were dissolved in sulfuric acid solutions under oxygen pressure (total pressure: 5atm) at 115°C and effects of the concentration of Fe³⁺, Fe²⁺, Zn²⁺, Cu²⁺and H₂SO₄in sample solutions taken at intervals on the rate of leaching were studied.
The rate of leaching was proportional to the square root of the Fe³⁺concentration when the Fe³⁺/Fe²⁺ratio was constant and the value was below 1.
The rate of leaching increased with an increase of the ratio up to about 3. The rate is inversely proportional to the square root of the Zn²⁺concentration (10-100g/l). Both the H₂SO₄concentration (>10g/l). and Cu²⁺concentration (0.5-20g/l) had no effect on the rate of leaching. In the temperature range from 80°to 115°C, the Arrhenius plott yielded an activation energy of 12kcal/mole.