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Wet preprocessing method for difficult-to-treat gold ore containing arsenic and antimony

A pretreatment and gold mine technology, applied in the direction of improving process efficiency, etc., can solve problems such as difficulty in the popularization and application of pyro-roasting gold extraction methods, environmental pollution, and no cyanide-free gold extraction methods, etc.

Inactive Publication Date: 2006-08-09
欧华北
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the method of extracting gold by fire roasting is difficult to popularize and apply so far.
Secondly, it is still difficult to promote the technologies applied to hot-pressed oxidation pretreatment and bacterial oxidation pretreatment in my country.
In addition, there is no report on the method of extracting gold from fine-grained disseminated arsenic and antimony refractory gold ores applied to large-scale industrial production
[0003] On the other hand, because gold is easily soluble in cyanide, cyanide has become the most commonly used solvent in the gold extraction method. However, the strong toxicity of cyanide makes people discolored when they hear it, and the degree of environmental pollution is very serious. Therefore, it is meaningful to find a method for extracting gold without cyanide
And there is no report of cyanide-free gold extraction method at present

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1. Add 3 parts of sodium hydroxide and 1 part of sodium hypochlorite in water and mix to form a solution with a concentration of 5%, and use the ratio of 3 parts by weight of the solution to 1 part by weight of refractory gold ore containing arsenic and antimony at 50°C Grind together into 100-mesh fine-grained pulp;

[0045] 2. Dilution, washing and gravity separation of the ground pulp and then solid-liquid separation, the separated ore can be used for conventional gold extraction;

[0046] 3. Or add an acidic chlorination combined oxidant with an active chlorine concentration of 1.5-10% mixed with bleaching powder, sulfuric acid, and hydrochloric acid to the minerals after solid-liquid separation, and mix evenly so that the concentration of active chlorine per kilogram of minerals Reach 0.5-5 grams, adjust the PH to 1, the water content to 15%, seal and cured for 7 days;

[0047] 4. The pretreated minerals can be extracted by conventional gold extraction or by cyani...

Embodiment 2

[0049] 1. Carry out conventional grinding and gravity separation of refractory gold ores containing arsenic and antimony, carry out conventional smelting of the re-selected gold concentrate, and use the arsenic-containing gold ore separated from solid and liquid for use;

[0050] 2. Add an acidic chlorination combined oxidant with an active chlorine concentration of 1.5-10% mixed with chlorine gas, hydrochloric acid, and hydrogen peroxide into the arsenic-containing refractory gold ore, and mix evenly so that the active chlorine concentration per kilogram of minerals is 0.5-5 grams, adjust the pH to 1, the water content to 15%, seal and melt for 7 days;

[0051] 3. After the above-mentioned pretreated minerals, gold can be extracted by conventional gold extraction or by cyanide-free gold extraction.

Embodiment 3

[0053] 1. Take bleaching powder, sulfuric acid, and hydrochloric acid to make an acidic chlorination and oxidation combination solution containing 1.5-10% active chlorine and mix it evenly with ore sand, so that the active chlorine concentration in each kilogram of ore sand reaches 0.5-5 grams, and adjust the pH value to below 1, and curiumization treatment was carried out at 40-80°C for 7 days;

[0054] 2, get again and be made into the chlorinated leach solution that initial chlorine concentration is 2 g / liter by chlorine, hydrochloric acid, table salt and water, and with 3 parts by weight of chlorinated leachate and 1 part by weight of the pretreated minerals through above-mentioned step 1 , leached at 50°C for 10 hours, after solid-liquid separation, the leaching solution was used for later use, and the separated slag returned to nature;

[0055] 3. Adjust the pH value of the above leachate to 5-6 with alkali;

[0056] 4. The above leaching solution is fully replaced by a...

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Abstract

This invention discloses a wet pre-process method for unwieldy gold mines containing As and Sb and a method for picking up gold not using cyanogens, which applies two steps of wet pre-process and no cyanogens to pick up gold and turns As and Sb to soluble materials to be solved in water and turns them in the state not influending the soak of gold then to remove them, which alters the tranditional method for picking up gold with cyanides, thus, gold can be picked up smoothly from the unwieldy gold mines of the type of fine particle dip-dye containing AS and Sb, the pick-up rate reaches to 70-95%.

Description

1. Technical field [0001] The invention relates to a method for extracting gold from gold ores, in particular to a wet pretreatment method for refractory gold ores containing arsenic and antimony and a cyanide-free gold extraction method. 2. Background technology [0002] As we all know, at present, the method for extracting gold from gold-bearing ores is mainly to dissolve the gold through cyanide through the finely ground gold ore, and then extract the gold. This is a conventional method of withdrawing gold. This conventional gold extraction method is effective for oxidized gold ore and general sulfide gold ore. However, it is difficult to extract gold by this method for refractory gold ores containing arsenic and antimony which are disseminated by fine grains. In fact, many regions in my country are rich in fine-grained disseminated gold ore resources containing arsenic and antimony that are refractory to treatment. Because there is no better extraction method for this...

Claims

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Application Information

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IPC IPC(8): C22B11/06C22B3/00C22B3/10C22B3/22
CPCY02P10/20
Inventor 欧华北
Owner 欧华北
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