Arsenic-resistant bacteria and method for performing oxidation treatment on high-arsenic gold concentrate by using same
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A technology for gold ore and ferrous oxide, applied in the field of metallurgy, can solve the problems of difficulty in culturing mixed bacteria and high residual arsenic content in ore
Inactive Publication Date: 2011-03-30
威远川奇生工科技有限责任公司 +1
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[0005] The purpose of the present invention is to overcome the difficulty in cultivating mixed bacteria and the high content of residual arsenic in the existing technology of bacterial oxidation treatment of high-arsenic fine g
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Embodiment 1
[0057] 1. Breeding and domestication of Thiobacillus ferrooxidans:
[0058] (1) Breeding of original strains:
[0059] Water samples were collected from the acid mine water of a highly arsenic-containing fine gold mine containing Thiobacillus ferrooxidans in Guizhou. The pH value of the collected water samples was 3.5. filter membrane, and put the filtered filter membrane into a steam-sterilized Erlenmeyer flask;
[0060] Add 45g ferrous sulfate heptahydrate, 3g ammonium sulfate, 0.5g dipotassium hydrogen sulfate, 0.5g magnesium sulfate heptahydrate, 0.1g potassium chloride, 0.01g calcium nitrate to 1L of distilled water to prepare the culture medium, adjust the culture medium with sulfuric acid The pH value is 1.5;
[0061] Add culture medium to the Erlenmeyer flask according to the volume ratio of acidic mine water:medium = 1:10, cultivate at 35°C for 6 days, and select the culture flask whose color changes from colorless to red for enrichment and purification to obtain th...
Embodiment 2
[0083] The domesticated Thiobacillus ferrooxidans screened in Example 1 was used as the ore leaching strain.
[0084] The components of the high-arsenic gold concentrate treated in this example are: 40.8g / t gold, 21.3% iron, 12.7% arsenic, and 25.4% sulfur. It belongs to pyrite and arsenopyrite-wrapped type, and the direct cyanide leaching rate of gold is 21.8%.
[0085] The method for oxidizing high-arsenic gold ore by utilizing the above-mentioned arsenic-resistant bacteria comprises the following steps:
[0086] (1) Amplified culture of arsenic-resistant bacteria:
[0087] The domesticated Thiobacillus ferrooxidans was inoculated into the culture medium in the bacterial culture tank to expand the culture, and the bacterial concentration was 10 8 -10 9 arsenic-resistant bacteria solution per mL;
[0088] The inoculum size of the expanded culture is based on 1mL of the bacterial solution inserted into 10mL of the culture medium, the culture temperature is 30-45°C, and the...
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Abstract
The invention relates to a method for treating high-arsenic gold concentrate, which belongs to the technical field of metallurgy. Arsenic-resistant bacteria of the invention are arsenic-resistant thiobacillus ferrooxidant (CCTCCCNO: M2010072) which are obtained by breeding and domesticating thiobacillus ferrooxidant-containing high-arsenic gold concentrate acid mine pit water. The method for treating the high-arsenic gold concentrate by using the arsenic-resistant bacteria comprises the steps of expanding and culturing the bacteria, performing paste mixing on the high-arsenic gold concentrate, performing bacterial oxidation treatment, acidizing to remove arsenic, cyaniding to extract gold, recovering the arsenic and the like. Compared with the conventional method for pretreating high-arsenic gold ore, the method for treating the high-arsenic gold concentrate has the advantages of efficiently recovering noble metal gold, recycling the side product, namely arsenic, solving the environmental problem of high arsenic content of sewage and waste residues subjected to the bacterial oxidation process treatment, reducing the consumption of a cyaniding medicament, increasing the gold-extracting ratio of the high-arsenic gold concentrate and contributing to the environmental protection and the sustainable development of the huge-reserve high-arsenic gold concentrate in China.
Description
technical field [0001] The invention relates to a method for treating high-arsenic fine gold ore, in particular to a method for oxidizing high-arsenic fine gold ore by using arsenic-resistant bacteria, and belongs to the technical field of metallurgy. Background technique [0002] Arsenic-containing fine gold ore is an important ore type in refractory gold ores. In this type of ore, gold exists in submicroscopic form in arsenopyrite and pyrite and other sulfides. It is directly cyanided by traditional technology. Gold extraction, the leaching rate of gold is less than 50%, so it is necessary to oxidize the fine gold ore before cyanidation to increase the leaching rate of gold. At present, the pretreatment methods for arsenic-containing fine gold ore mainly include oxidative roasting, pressurized oxidation and bacterial oxidation. The oxidative roasting method removes the arsenic and iron inclusions by oxidative roasting to increase the extraction rate of gold, but the large...
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