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Method for recovering gold from gold-containing barren solution and purifying gold-containing barren solution

A technology for recovering gold and barren liquid, applied in the direction of improving process efficiency, etc., can solve the problems of high processing cost, affecting gold cyanide leaching, increasing calcium ions, etc., and achieve the effect of reducing pollution coefficient and recycling cost

Inactive Publication Date: 2012-01-25
FUJIAN SHUANGQISHAN MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process needs to use a large amount of acid and alkali reagents, and the treatment cost is relatively high. Moreover, the use of a large amount of lime in this process greatly increases the calcium ions in the barren solution, which affects the cyanide leaching of gold. At the same time, the gold in the barren solution containing gold is also The form of precipitate is separated from the gold-bearing barren solution, and the gold is not recovered effectively

Method used

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  • Method for recovering gold from gold-containing barren solution and purifying gold-containing barren solution
  • Method for recovering gold from gold-containing barren solution and purifying gold-containing barren solution
  • Method for recovering gold from gold-containing barren solution and purifying gold-containing barren solution

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Embodiment 1

[0027] Such as figure 1 Shown, a kind of purification method of the present invention reclaims gold and barren solution thereof from gold-containing barren solution, realizes by following steps successively:

[0028] Step S1: providing a gold-containing cyanide poor solution as a feed solution.

[0029] Step S2: sieving and filtering through a multimedia filter after adding a bactericide to the gold-cyanide-containing barren solution.

[0030] Wherein, the bactericide is one or a mixture of isothiazolinone and bromo-containing aziramide, and the dosage is 0.5 ppm. Bactericides are non-oxidizing substances that inactivate and inhibit microbial contamination, including bacteria, fungi, and algae. Adding a bactericide before entering the microfiltration membrane and nanofiltration membrane system in the microfiltration step S3 and the first nanofiltration step S4 can inhibit microbial contamination of the microfiltration membrane and nanofiltration membrane.

[0031] The multi...

Embodiment 2

[0067] Such as figure 2 As shown, the main difference between embodiment two and embodiment one is to increase the second nanofiltration step S4' between the first nanofiltration step S4 and the acidification precipitation step S5, and other steps are all the same. Wherein, the second nanofiltration step S4' is specifically as follows, the concentrated solution obtained in the first nanofiltration step S4 is sieved and filtered through the second nanofiltration membrane, and the resulting dialysate is returned to the gold leaching process, and the resulting concentrated solution is Enter the next acidification precipitation step S5. In this embodiment, through the first nanofiltration step S4 and the second nanofiltration step S4', not only an effective interception effect can be achieved, the operating cost of the nanofiltration membrane equipment can be reduced, and the recovery of gold and cyanide in the gold-containing barren solution can be improved. The efficiency can ...

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Abstract

The invention discloses a method for recovering gold from gold-containing barren solution and purifying the barren solution. In the method, sulfuric acid is added into gold-containing cyanide barren solution to perform acidification precipitation, pH value of the solution is regulated to be less than or equal to 2, ferrocyanide, copper, zinc and lead in the gold-containing cyanide barren solution are separated and removed from the gold-containing cyanide barren solution in a precipitate mode; lime is added into the separated acidic supernatant for neutralizing until the pH value is between 10 and 12, and formed calcium sulfate precipitate is removed; and a calcium removing agent is added into the separated basic supernatant, the formed precipitate is removed, and the separated supernatant is returned to the gold leaching process, wherein before the acidification precipitation step, a bactericide is added to the gold-containing cyanide barren solution, and the gold-containing cyanide barren solution is subjected to multi-medium filtration, microfiltration and first nano-filtration in sequence. According to the method for recovering gold from the gold-containing barren solution and purifying the barren solution, the dosage of acid agent is greatly reduced, and the treatment cost for the barren solution is reduced.

Description

technical field [0001] The invention relates to the field of nonferrous metallurgy, in particular to a method for recovering gold from gold-containing barren liquid and purifying the barren liquid. Background technique [0002] At present, most gold production enterprises use the cyanidation method to extract gold. The cyanide-containing barren solution produced by the cyanidation process has a large amount of treatment and is difficult to handle. It is the most important pollutant in gold mines. At present, most gold mines carry out closed loop circulation of cyanide barren solution. However, the continuous circulation of the poor liquid will cause the accumulation of various impurities, such as Cu, Zn, Pb, As, Sb, etc., which will cause the "fatigue" of the poor liquid and affect the leaching rate; the viscosity of the poor liquid will also increase, which will affect the washing rate; at the same time , the salt content of the lean liquid increases, which affects the sed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/08C22B7/00C22B3/44C22B3/22
CPCY02P10/20
Inventor 林志群
Owner FUJIAN SHUANGQISHAN MINING
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