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Reinforced leaching method for complex refractory gold ore

An enhanced leaching and complex technology, applied in the field of metal hydrometallurgy, can solve the problems of low extraction rate of valuable metals, large investment in production equipment, high production cost, etc.

Inactive Publication Date: 2019-06-14
柯柏友
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the application of high-pressure pre-oxidation, biological pre-oxidation, roasting pre-oxidation and other technologies in the gold extraction of complex and refractory gold ores, the development and utilization of complex and refractory gold ores is becoming more and more extensive, but there are still low extraction rates of valuable metals, production equipment Large investment and high production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] A gold concentrate in Xingyi, Guizhou, the average gold grade is 86.6g / t, the arsenic content is as high as 15.3%, the sulfur content is 35.9%, the carbon content is 2.6%, and the gold concentrate mesh -200 mesh accounts for 85%. The leaching rate of gold is 15%-25%, and the leaching time is 72 hours. Using catalytic enhanced leaching, alkali (N a OH) 75 kg / ton of ore + catalytic oxidant CFZ-S 4 kg / ton of ore + activator CFZ-C 2 kg / ton of ore to strengthen pretreatment for 24 hours, then lime to adjust the pH value to 12, and add Chaofan brand environmental protection gold extraction agent 12 kg / ton of ore was leached for 12 hours, and the leaching rate reached 95.46%.

Embodiment 2

[0011] A gold concentrate in Myanmar is a complex refractory gold concentrate with a gold grade of 36.3g / t, a sulfur content of 30.1%, and an arsenic content of 22.7%. Cyanide leaching, the gold leaching rate is about 10%. Catalytic enhanced leaching is adopted, and the gold concentrate is further ground to -350 mesh, accounting for 90%, and alkali (N a OH) 105 kg / ton of ore + catalytic oxidant CFZ-S 5 kg / ton of ore + activator CFZ-C 2 kg / ton of ore to strengthen pretreatment for 24 hours, then lime to adjust the pH value to 12, and add Chaofan brand environmental protection gold extraction agent 8 kg / ton of ore was leached for 12 hours, and the leaching rate reached 89.26%. Achieve better economic and social benefits. Bring good news to mines.

Embodiment 3

[0013] A gold concentrate in Longnan, Gansu contains 52.9g / t of gold, 26.73g / t of silver, 3.21% of antimony, 8.13% of carbon, 21.4% of sulfur, and 5.3% of arsenic; with conventional cyanide leaching, the gold leaching rate is about 15%. Catalytic enhanced leaching is adopted, and the gold concentrate is further ground to -300 mesh, accounting for 90%, and alkali (N a OH) 25 kg + catalytic oxidizer CFZ-S 3 kg / ton ore + activator CFZ-C 1.5 kg / ton ore intensive pretreatment for 24 hours, then lime to adjust the pH value to 12, add Chaofan brand environmental protection gold extraction agent 11 kg / ton The ore was leached for 12 hours, and the leaching rate reached 92.43%. achieve satisfactory results.

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Abstract

The invention relates to a reinforced leaching method for complex refractory gold ore. According to the method, novel additives of CFZ-S and CFZ-C are added to cooperate with sodium hydroxide (NaOH) so as to perform reinforced pretreatment on complex refractory gold concentrate, and then a gold leaching agent is added for conventional gold leaching; the novel additives of CFZ-S and CFZ-C have theeffects of catalyzing, oxidizing and activating so that the oxidation reaction only occurred when the pozzuolite mineral are under high temperature and high pressure can be induced under normal temperature and normal pressure, then the gold wrapped in the pozzuolite mineral and other minerals can be dissociated and exposed, so that the carbon with preg-robbing capacity loses activity and then canno longer pay a role in pre-robbing; the a gold extraction agent is adopted for conventional leaching gold extraction, so that for the gold mineral containing 20%-35% of sulfur, 5%-25% of arsenic, 1%-3% of antimony and 1%-8% of carbon, the cyanide leaching rate is increased to 85%-98% from the ratio less than 10%-30%, the leaching speed is shortened by 50%, then the refractory gold ore becomes less refractory, and better economic benefits can be obtained.

Description

technical field [0001] The invention belongs to the field of metal hydrometallurgy and relates to an enhanced leaching method for complex refractory gold ores. Background technique [0002] With the rapid economic development and large-scale mining development, the easy-to-handle gold ore resources are decreasing or exhausted, and the complex and difficult-to-handle gold ore has become the main resource of gold production. According to statistics, more than 60% of the world's gold reserves are difficult Dealing with gold ore, and currently 1 / 3 of the global gold production comes from refractory mines. The rational, efficient and environmentally friendly development and utilization of refractory gold ore resources has become the main technical problem faced by the gold-producing countries in the world. , in my country, the proportion of refractory gold ore resources to the proven reserves has been maintained at about 1 / 3, so the processing of refractory gold ore resources is wh...

Claims

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Application Information

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IPC IPC(8): C22B3/12C22B11/00
CPCY02P10/20
Inventor 柯柏友
Owner 柯柏友
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