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A method for removing cyanide in cyanide slag
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A technology of cyanide and sulfur oxides, which is applied in the direction of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve the problems of large consumption and high treatment costs, reduce usage, and solve SO2 consumption The effect of large quantity and cost reduction
Active Publication Date: 2019-11-05
CENT SOUTH UNIV
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[0004] The main purpose of the present invention is to provide a method for removing cyanide in cyanide slag, to solve the problem of removing cyanide process SO in the prior art INCO method. 2 The problem of high consumption and high processing costs
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Embodiment 1
[0042] Utilize the method laboratory of the present invention to process gold cyanide leaching slag of an enterprise in Shandong, the total cyanide content is 552mg / L, and pH is 10.5-11.
[0043] Add 2kg of cyanide slag and its leachate (solid-to-liquid mass ratio 1:3) into a 15L reactor, stir at a speed of 90-120r / min, add 200-250mg of CuSO 4 ·5H 2 O, add 2ml of acclimatized bacteria, and blow into air (or pass into SO at the same time 2 ), the air flow rate is 50-200ml / min; adding lime water to control the pH to 10-11, the reaction temperature is 25-30°C, and the reaction time is 12-72 hours. After the removal of cyanide is completed, the pulp is filtered to separate the solid from the liquid, and the cyanide content is measured respectively. Table 1 shows the results of the cyanide removal test on cyanide-containing leaching slag.
[0044] Table 1 Cyanogen removal test results of cyanide-containing leaching slag
[0045]
[0046] As can be seen from Table 1, adopt th...
Embodiment 2
[0048] Utilize the method laboratory of the present invention to process gold cyanidation leaching slag of an enterprise in Hunan, the total cyanide content is 732mg / L, and pH is 10-10.5.
[0049] Add 2kg of cyanide slag and its leachate (solid-to-liquid mass ratio 1:3) into a 15L reactor, stir at a speed of 90-120r / min, add 200-250mg of CuSO 4 ·5H 2 O, add 2.5ml of domesticated bacteria, and blow into air (or pass into SO at the same time 2 ), the air flow rate is 50-200mL / min; adding lime water to control the pH to 10-11, the reaction temperature is room temperature 25-30°C, and the reaction time is 18-84 hours. After the cyanide removal is completed, the pulp is filtered to separate the solid from the liquid, and the cyanide content is measured respectively. Table 2 shows the results of the cyanide removal test on the cyanide-containing leaching slag.
[0050] Table 2 Cyanogen removal test results of cyanide-containing leaching slag
[0051]
[0052] As can be seen f...
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Abstract
The invention discloses a method for removing cyanide in cyanide slag, which comprises the following steps: domesticating Thiobacillus thiooxidans to obtain domesticated Thiobacillus thiooxidans, adding the domesticated Thiobacillus thiooxidans to cyanide slag reaction, using the domesticated Thiobacillus thiooxidans to oxidize the low-valence sulfur in the cyanide slag to the high-valence sulfur transition state to oxidize the cyanide in the cyanide slag, that is, to realize the cyanide removal, wherein the cyanide slag contains pyrite or pyrrhotite. The method has the advantages of simple process flow, good removal effect, no pollution, etc., and it can turn waste into valuable pyrite or pyrrhotite resources in cyanide slag, greatly reducing SO 2 usage, greatly reducing costs. This method solves the problem of SO in the process of removing cyanide by the existing INCO method. 2 The consumption is large, and the processing cost remains high.
Description
technical field [0001] The invention relates to the technical field of cyanide treatment, in particular to a method for removing cyanide in cyanide slag. Background technique [0002] Cyanide is a highly toxic substance. The average lethal oral dose of HCN is 50 mg, sodium cyanide is about 100 mg, and potassium cyanide is about 120 mg. Cyanide is harmful to the human body and has a great impact on human health, and cyanide is also more harmful to fish and other aquatic organisms. The cyanide content in water is converted into cyanide ion (CN - ) at a concentration of 0.04-0.1 mg / L can kill fish. CN for plankton and crustaceans - The maximum allowable concentration is 0.01 mg / L. The toxicity of cyanide to fish in water is also related to the pH value of the water, the presence of dissolved oxygen and other metal ions. Cyanide-containing wastewater can also cause agricultural production reduction and livestock death. Gold extraction requires leaching the ore with cyanid...
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