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Method for extracting arsenic from gold ore

A technology for gold ore and ore pulp, applied in the field of arsenic extraction, can solve the problems of high equipment and material requirements, low processing cost and high method cost, and achieve the effects of improving cyanidation leaching rate, realizing comprehensive recycling and reducing pollution risks.

Inactive Publication Date: 2014-03-26
GUANGZHOU RES INST OF NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are certain defects in these several methods. The roasting oxidation method produces a large amount of toxic gases such as sulfur dioxide and arsenic trioxide during the roasting process, which seriously pollutes the environment; The cost is high; the treatment cost of the stirred tank immersion bacterial oxidation method is relatively low, but the lime neutralization precipitation method is used in the production process to treat the arsenic-containing wastewater, which produces a large amount of arsenic-containing precipitates, and there is a risk of secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A high-arsenic refractory gold concentrate contains 5.50% arsenic, the gold grade is 40g / t ore, and the particle size is -0.043mm, accounting for 90.50%. The following steps are used for treatment:

[0019] (1) Strain cultivation: use Acidophilus ferrooxidans as leaching strain, ammonium sulfate 5g / L, potassium chloride 0.1g / L, dipotassium hydrogen phosphate 0.5g / L, calcium nitrate 0.02g / L , Ferrous sulfate 45g / L is made into liquid culture medium, pH1.80, after inoculating bacteria in the culture medium, inflate and culture for 36h, obtain bacterial culture fluid.

[0020] (2) Bacterial pre-oxidation of arsenic minerals: add 1000g of arsenic-containing gold concentrate to 4000mL of bacterial culture solution to make a slurry with a concentration of 20% by mass, and put it into a leaching mixing tank for bacterial pre-oxidation. The pre-oxidation conditions are: the pH value of the pulp is 1.80, the temperature is 30°C, the air volume is 5.0L / L.min, and the stirring spe...

Embodiment 2

[0023] A high-arsenic refractory gold concentrate contains 14.00% arsenic, the gold grade is 41.5g / t ore, and the particle size is -0.043mm, accounting for 92.30%. The following steps are used for treatment:

[0024] (1) Strain cultivation: use Acidophilus ferrooxidans as leaching strain, ammonium sulfate 5g / L, potassium chloride 0.1g / L, dipotassium hydrogen phosphate 0.5g / L, calcium nitrate 0.02g / L , Ferrous sulfate 45g / L is made into liquid culture medium, pH1.80, after inoculating bacteria in the culture medium, inflate and culture for 36h, obtain bacterial culture fluid.

[0025] (2) Bacterial pre-oxidation of arsenic minerals: Add 500g of arsenic-containing gold concentrate to 4500mL of bacterial culture solution to make a slurry with a concentration of 10% by mass, and put it into a leaching stirring tank for bacterial pre-oxidation. The pre-oxidation conditions are: the pH value of the pulp is 1.80, the temperature is 30°C, the air volume is 5.0L / L.min, and the stirring...

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Abstract

A method for extracting arsenic from gold ore is characterized by comprising the following steps: taking acidithiobacillus ferrooxidans as a leaching bacterial strain, taking ammonium sulfate, potassium chloride, dipotassium hydrogen phosphate, calcium nitrate and ferrous sulphate as a medium, so as to obtain a bacteria nutrient solution; adding arsenic-containing gold ore powder into the bacteria nutrient solution to prepare an ore pulp, and performing pre-oxidation on ore pulp bacteria; stopping pre-oxidation, filtering and washing the ore pulp; recovering arsenic from the solution, and using the pre-oxidation slag to extract gold; adjusting the pH value of the arsenic-containing solution with sodium hydroxide, filtering, adding copper sulfate into the filtrate, adjusting the pH value of the solution, and performing precipitation, filtering and washing to obtain copper arsenite; and adjusting the pH value of the filtrate from which copper arsenite is precipitated by using calcium oxide, removing precipitation, neutralizing with sulfuric acid and discharging the wastewater reaching the standard. The method provided by the invention is capable of effectively leaching out harmful element arsenic from ore, and the leaching rate of arsenic is more than 90%, so that the arsenic content in ore is substantially reduced, and the comprehensive recovery utilization of arsenic resource in ore is realized.

Description

technical field [0001] The invention relates to a method for extracting arsenic from gold ore. Background technique [0002] The ore in which gold is wrapped in arsenic-containing sulfide minerals in the form of microscopic or submicroscopic or even lattice gold is an extremely difficult ore to process. my country is relatively rich in arsenic-containing refractory gold ore resources. According to incomplete statistics (calculated by the amount of gold metal), there are about 2,000 tons. Using the conventional cyanide gold extraction process, the gold leaching rate is very low, generally 20-50%. The main reason is that during the cyanidation leaching process of such ores, it is difficult for gold to combine with the leaching agent, and because the solubility of arsenic sulfide in the solution is high, a large amount of cyanide and dissolved oxygen in the solution will be consumed during cyanidation. In addition, harmful elements such as arsenic in the ore after direct cyan...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B3/46C22B11/00
CPCY02P10/20
Inventor 周吉奎喻连香
Owner GUANGZHOU RES INST OF NON FERROUS METALS