閃亜鉛鉱の銅活性化効果の除去に関する研究

抄録

The separation of copper and zinc minerals in the complex sulphide ores flotation is very difficult on account of the copper activation. Therefore, the deactivation of copper-activated sphalerite is the most important subjects for the complex sulphide ore flotation.
In this study, the deactivation of the copper-activated sphalerite has been investigated in a series of the laboratory experiments.
The effects of H₂SO₄ and Fe⁺⁺⁺ion. in the presence of H₂SO₄ on the deactivation of the copper-activated sphalerite were examined from the flotation test by the Hallimond tube.
From the results obtained, it was recognized that the deactivation of the copper-activated sphalerite could be attained some degree by the 3-;5 vol.% H₂SO₄ solution and could be attained remarkably by the 500-1, 000 mg/l Fe⁺⁺⁺ solution containing H₂SO₄. O₂ gas accelerates the deactivation of the sphalerite in the treatment of the above both solutions. The temperature is one of the important factors for the deactivation.
Then, the dissolution of the copper activated film formed on the sphalerite was investigated. From th result, it was recognized that the copper activated film could be dissolved completely by the Fe⁺⁺⁺solution containing H₂SO₄, and could be dissolved some degree by the H₂SO₄ solution.
The dissolution rate of the activated film was measured as a function of the concentration of Fe⁺⁺⁺ and H₂SO₄ and of the temperature. The dissolution rate is shown by a linear equation. The temperature dependence for the dissolution was pursued.
Using the flotation machine, the differential flotation tests of Cu-Zn sulphide ore were carried out. As the results, the separation of copper and zinc minerals was successful by the deactivation treatment for the Cu-Zn sulphide ore.