Gold extraction method by pre-oxidation and cyanide leaching of refractory gold concentrate

A technology of cyanidation leaching and pre-oxidation, which is applied in the direction of improving process efficiency, can solve problems such as the extraction and smelting of gold ore that have not been seen, and achieve the effects of easy industrial application, low cost and strong adaptability of raw materials.

Active Publication Date: 2012-04-11
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Later pyrolusite oxidized sulfide ore process was applied to the oxidation leaching process of other metal sulfide ores, such as the hydrometallurgy of zinc sulfide ore and indium sulfid

Method used

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  • Gold extraction method by pre-oxidation and cyanide leaching of refractory gold concentrate
  • Gold extraction method by pre-oxidation and cyanide leaching of refractory gold concentrate

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0023] Example 1:

[0024] An example of the present invention figure 1 As shown in the method for extracting gold by pre-oxidation-cyanide leaching of refractory gold concentrate, the main material in the refractory gold concentrate selected is pyrite / arsenic pyrite coated refractory gold concentrate. The Au content in the iron ore / arsenic pyrite-coated refractory gold concentrate reaches 76.55g / t, and the S content is 17.4% (the percentages in the composition ratio are expressed as mass fractions unless otherwise specified), and As is 3.44 %, Fe is 21.95%, and the main steps are as follows.

[0025] 1. Fine grinding: Mix 50g of the above-mentioned refractory gold concentrate with 0.5g of sodium lignosulfonate, and use a mill (rod mill, ball mill, tower mill or agitating ball mill) to fully grind the mixed materials As fine as 95% through 25μm.

[0026] 2. Acidic pre-oxidation: the oxidant pyrolusite (the main component is MnO 2 52%, Fe 5.72%) and the finely ground materials in s...

Example Embodiment

[0030] Example 2:

[0031] An example of the present invention figure 1 As shown in the method for extracting gold by pre-oxidation-cyanide leaching of refractory gold concentrate, the main material in the refractory gold concentrate selected is pyrite / arsenic pyrite coated refractory gold concentrate. The Au content in the iron ore / arspyrite-coated refractory gold concentrate reaches 43.43g / t, the S content is 19%, the As is 5.86%, and the Fe is 21.90%. The main steps are as follows.

[0032] 1. Fine grinding: Mix 50g of the above-mentioned refractory gold concentrate with 0.75g sodium lignosulfonate, and use a mill (rod mill, ball mill, tower mill or agitating ball mill) to fully grind the mixed materials As fine as 95% through 45μm.

[0033] 2. Acidic pre-oxidation: mix the oxidant pyrolusite (the manganese ore composition is the same as in Example 1) and the finely ground material in step 1 to mix and adjust the slurry at a mass ratio of 2.4:1, and then mix and stir the adjuste...

Example Embodiment

[0037] Example 3:

[0038] An example of the present invention figure 1 As shown in the method for extracting gold by pre-oxidation-cyanide leaching of refractory gold concentrate, the main material in the refractory gold concentrate selected is pyrite / arsenic pyrite coated refractory gold concentrate. The Au content in the iron ore / arsenic pyrite-coated refractory gold concentrate reaches 64.34g / t, the S content is 31.1%, As is 10.81%, and Fe is 36.19%. The main steps are as follows.

[0039] 1. Fine grinding: Mix 50g of the above-mentioned refractory gold concentrate with 0.15g sodium tartrate, and use a mill (rod mill, ball mill, tower mill or agitating ball mill) to fully grind the mixed material to 95 % Through 38μm.

[0040] 2. Acidic pre-oxidation: mix the oxidant pyrolusite (the composition is the same as in Example 1) and the finely ground material in step 1 at a mass ratio of 3:1, and then mix and stir the slurry with concentrated sulfuric acid. One-stage acidic pre-oxid...

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Abstract

The invention discloses a gold extraction method by pre-oxidation and cyanide leaching of refractory gold concentrate, comprising the following steps: firstly mixing the refractory gold concentrate and a dispersing agent, grinding by a grinder; then mixing the oxidant and the grinded material, size mixing; then mixing and stirring the slurry with concentrated sulfuric acid, so as to perform more than a period of acid pre-oxidation reaction, reacting for more than one hour at a constant temperature, separating the solid and the liquid; then adjusting the pH value of the gold-bearing slag afterthe pre-oxidation, performing alkaline pretreatment for more than one hour; performing cyanide gold extraction on the slurry after alkaline pretreatment, passing oxygen or air during the cyanide process. The invention has advantages of low cost, simple operation, strong adaptability of raw material, high gold recovery rate, environmental pollution-free and easy industrial application.

Description

technical field [0001] The invention belongs to the technical field of gold extraction by hydrometallurgy, in particular to a method for leaching and extracting gold from refractory gold ores. Background technique [0002] Refractory gold ore, also known as refractory gold ore or recalcitrant gold ore, refers to an ore in which most of the gold cannot be effectively leached by conventional cyanidation even after fine grinding. With the large-scale mining of gold mines, the refractory gold ore resources in the world are decreasing day by day, and the refractory gold ore will become the main mineral resources of the gold industry in the future. According to incomplete statistics, 30% of my country's proven gold reserves are refractory gold mines, which are mainly distributed in Liao, Hunan, Guangxi, Guizhou, Gansu, Anhui, Kyrgyzstan and other regions. The development and utilization of refractory gold mines has become an important task in the gold industry. [0003] Among th...

Claims

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Application Information

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IPC IPC(8): C22B11/08
CPCY02P10/20
Inventor 肖松文陈坚夏星刘国伟曾子高李泽茂
Owner CHANGSHA RES INST OF MINING & METALLURGY
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