Bioleaching of Complex Refractory Gold Ore Concentrate of China: Comparison of Shake Flask and Continuous Bioreactor

Yan Song; Hong Ying Yang; Lin Lin Tong

doi:10.4028/www.scientific.net/AMR.1130.243

Paper Titles

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Optode-Based Oxygen Measurements in Bioleaching Reactors
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Bioleaching of Complex Refractory Gold Ore Concentrate of China: Comparison of Shake Flask and Continuous Bioreactor
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Comparative Experiments on Acid Leaching and Bioleaching to a Sandstone Type Uranium Ore
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Bioleaching of Complex Refractory Gold Ore Concentrate of China: Comparison of Shake Flask and Continuous Bioreactor

Abstract:

The laboratory tests of biooxidation and cyanidation were carried out by using samples of the complex refractory gold ore from China. The elemental composition was 16.8 % iron, 18.6 % sulfur, 4.88 % arsenic，2.30 % carbon and 3.49 % antimony. Gold is assayed at 46 g/t. The arsenic oxidation of 88.11 %，carbon removal rate of 32.34 % and antimony oxidation of 23.92 % over 16d was achieved in shake flasks in the presence of the mixed culture (HQ0211: Thiobacillus ferrooxidans Leptospirillum ferrooxidans and Thiobacillus thiooxidans). The continuous bioreactor tests resulted in greater dissolution rates for arsenic, carbon and antimony, which led to a greater extent of sulphide oxidation within a shorter period of time. The maximum oxidation of arsenic and antimony was 90.72 % and 40.09 % respectively and the removal rate of carbon is 63.48% after 8d in the continuous bioreactor tests. After bioleaching, the gold recovery of the oxidation residue was 98.02 % with the cyanidation method, which was showed the biological pretreatment was applicable to the complex refractory gold ore.