| Budget Amount *help |
¥18,070,000 (Direct Cost: ¥13,900,000、Indirect Cost: ¥4,170,000)
Fiscal Year 2014: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2013: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2012: ¥10,010,000 (Direct Cost: ¥7,700,000、Indirect Cost: ¥2,310,000)
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| Outline of Final Research Achievements |
This study investigated the development of advanced mineral processing such as flotation - leaching - precipitation for removing impurities such as arsenic (As) and antimony (Sb) from copper ore with tennantite, tetrahedratite and enargite. In flotation, 95 % of enargite (Cu3AsS4) was recovered from the ore at pH4. On the other hand, recovery of chalcopyrite reached 20%. It is possible to separate enargite and chalcopyrite by controlling hydrophobicity of mineral surface and stability of froth that forms in the flotation cell by the addition of flotation reagents. In alkaline leaching, 90% of As and Sb were dissolved from the ore in NaOH - NaHS media under the optimum leaching conditions. In precipitation, more than 90 % of As and Sb were removed as a precipitate from the solution by adding sulphur, cooling and conditioning. Accordingly, valuable treatment conditions for removing impurities such as arsenic (As) and antimony (Sb) from dirty copper ore were developed.
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