Bioleaching of refractory gold ore （ Ⅱ ）——Mechanism on bioleaching of arsenopyrite by Thiobacillus ferrooxidans

1　ＩＮＴＲＯＤＵＣＴＩＯＮＢｉｏｌｅａｃｈｉｎｇｐｒｏｃｅｓｓｅｓｈａｖｅｂｅｅｎｕｓｅｄｅｘｔｅｎｓｉｖｅｌｙｔｏｒｅｃｏｖｅｒｂａｓｅｍｅｔａｌｓ (ｍａｉｎｌｙｃｏｐｐｅｒ)ａｎｄｕｒａｎｉｕｍｆｒｏｍｌｏｗ ｇｒａｄｅｏｒｅｓａｎｄｍｏｒｅｒｅｃｅｎ     

Bioleaching of refractory gold ore （ Ⅲ ）——Fluid leaching Jinya refractory gold concentrate by Thiobacillus ferrooxidans

A novel fluidized-bed reactor was designed and installed for bloleaching in a semi-continuous way, by which a process for biuleaching-cyanidation of Jinya refractory gold arsenical concentrate was studied. The arsenic extraction rate reaches 82.5 % after 4-day batch biooxidation of the concentrate under the optimized condition of pH 2.0, ferric ion concentration 6.Sg/L and pulp concentration 10%. And leached rate of gold in the following cyanida.tion is over 90%. The parameters of three series fluidized-bed reactors exhibit stability during the semi-continuous bioleaching of the concentrate.Armmic in the concentrate can be got rid of 91% after 6-day leaching. Even after 4 days, 82% of arsenic extraction rate was still obtained. The recovery rates of gold are 92 % and 87.5 % respectively in cyaniding the above bioleached residues.The results will provide a base for further commercial production of gold development.     

Study on bioleaching of refractory gold ore (Ⅰ)──Mechanism on bioleaching of pyrite by Thiobacillus ferrooxidans

1　ＩＮＴＲＯＤＵＣＴＩＯＮＳｔｕｄｉｅｓｏｎｔｈｅｇｒｏｗｔｈ[1～ 3 ] ａｎｄａｐｐｌｉｃａｔｉｏｎｓ[4 ] ｏｆＴｈｉｏｂａｃｉｌｌｕｓｆｅｒｒｏｏｘｉｄａｎｓｈａｖｅｂｅｅｎｃａｒｒｉｅｄｏｕｔｂｙｍａｎｙｒｅｓｅａｒｃｈｅｒｓ ,ｓｉｎｃｅｉｔｉｓｏｎｅｏｆｔｈｅｍｏｓｔｉｍｐｏｒ ｔａｎｔｍｉｃｒｏ ｏｒｇａｎｉｓｍｓｆｏｒｔｈｅｒｅｃｏｖｅｒｙｏｆｓｏｍｅｍｅｔａｌｓｉｎｃｌｕｄｉｎｇｃｏｐｐｅｒａｎｄｕｒａｎｉｕｍｆｒｏｍｌｏｗ ｇｒａｄｅｏｒｅｓｉｎｉｎｄｕｓｔｒｉａｌｈｅａｐ ,ｄｕｍｐ ,…