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Cyaniding gold extraction barren liquor treatment method and cyaniding gold extraction method

A treatment method and technology of barren solution, which is applied in the field of treatment of barren solution for cyanidation gold extraction, can solve problems such as environmental hazards, safety hazards, and affecting gold ore dissolution rate, and achieve the goals of avoiding environmental pollution, reducing operating costs and economic costs Effect

Active Publication Date: 2018-01-12
中城华宇(北京)矿业技术有限公司 +1
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Problems solved by technology

Therefore, if the cyanide gold extraction poor solution is directly returned to the cyanide gold extraction process to dissolve the gold ore, a large amount of cyanide needs to be supplemented to meet the concentration requirements of free cyanide in the leaching process, and the cyanide gold extraction poor solution Containing a large amount of complex cyanide will also affect the dissolution rate of gold ore
However, if the poor solution of cyanide gold extraction is directly discharged, it will bring environmental and safety hazards

Method used

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  • Cyaniding gold extraction barren liquor treatment method and cyaniding gold extraction method
  • Cyaniding gold extraction barren liquor treatment method and cyaniding gold extraction method
  • Cyaniding gold extraction barren liquor treatment method and cyaniding gold extraction method

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Effect test

Embodiment 1

[0044] The present embodiment provides a kind of treatment method of cyanidation gold extraction barren liquid, specifically comprises:

[0045] Add concentrated sulfuric acid to the poor solution for gold extraction by cyanide, adjust the pH value to 4±1, then add sodium sulfide, the amount of sodium sulfide added is about 1.4 times the sum of the molar amounts of zinc ions and copper ions in the poor solution, and the reaction is about After 15 minutes, no more precipitation occurs, and then continue to precipitate for about 25 minutes. After solid-liquid separation, supernatant and precipitate are obtained respectively.

[0046] Lime was added to the above supernatant to keep the pH of the supernatant not lower than 12. After reacting for about 15 minutes, no calcium sulfate precipitation was observed, and then the precipitation continued for about 20 minutes. After solid-liquid separation, cyanide solution and Calcium sulfate precipitates.

[0047] Wherein, see Table 1 fo...

Embodiment 2

[0052] The present embodiment provides a kind of processing method of cyanidation gold extraction barren solution, and its technological process sees figure 1 , including the following steps:

[0053] S1, zinc chemical separation

[0054] Add concentrated sulfuric acid to the poor solution obtained by the Merrill-Crowe cyanide gold extraction process, adjust the pH value to about 6, and then add sodium sulfide. The amount of sodium sulfide added is about 1.2 times the molar amount of zinc ions in the poor solution, and the reaction is about After 10 minutes, no precipitate was observed, and then precipitated for about 25 minutes. After solid-liquid separation, the zinc-removed supernatant and zinc sulfide precipitate were obtained.

[0055] The zinc sulfide precipitate is subjected to dehydration treatment to obtain zinc mud, and then the water obtained by the removal is incorporated into the zinc removal supernatant.

[0056] S2, chemical separation of copper

[0057] Add ...

Embodiment 3

[0066] Embodiment 3 carried out following case according to the method for embodiment 2:

[0067] table 3

[0068]

[0069] After calculation, the concentration of zinc ions in the zinc-removing supernatant is reduced by more than 99% compared with the lean solution, and the concentration of copper ions in the supernatant is reduced by more than 80% compared with the lean solution; after testing, the zinc content in the zinc mud is 42%. ; Copper mud copper content is 58%. It shows that with the treatment method in this example, the zinc and copper in the barren solution are effectively separated and recovered.

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Abstract

The invention provides a cyaniding gold extraction barren liquor treatment method and a cyaniding gold extraction method. The cyaniding gold extraction barren liquor treatment method comprises the following steps: 1, adding sulfuric acid in cyaniding gold extraction barren liquor, adding soluable sulfide under the acidic condition for reaction until no generation of precipitate, and obtaining theprecipitate and liquid supernatant through solid-liquid separation; and 2, adding calcium hydroxide in the liquid supernatant for reaction until no generation of precipitate, and obtaining calcium sulfate precipitate and cyanide solution through solid-liquid separation. With adoption of the cyaniding gold extraction barren liquor treatment method, complexed cyanogen in cyaniding gold extraction barren liquor can be effectively converted into dissociative cyanogen to obtain high-quality cyanide solution with higher concentration and meet the technological requirements of cyaniding gold extraction.

Description

technical field [0001] The invention relates to a treatment method for a poor solution for cyaniding gold extraction and a method for extracting gold by cyanidation, in particular to a method for recovering cyanide solution from the poor solution for cyaniding gold extraction and realizing the recycling of the cyanide solution. Background technique [0002] Cyanide gold extraction technology is the most commonly used method for extracting gold from gold mines in modern times. At first, the gold mines are leached with cyanide solution to obtain gold ions (such as NaAu(CN) 2 ) cyanidation gold extraction precious liquid, and then through means such as zinc powder replacement, activated carbon adsorption or ion exchange adsorption, the gold in the precious liquid is separated. Cyanide gold extraction technology has the advantages of high recovery rate and strong adaptability to ore properties, so it has been widely used. [0003] In the process of gold extraction by cyanidatio...

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B11/08C22B15/00C22B19/20
CPCY02P10/20
Inventor 袁欣波谢祖宁程涛
Owner 中城华宇(北京)矿业技术有限公司
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