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Extraction method of high-purity gold

An extraction method, pure gold technology, applied in the field of high-purity gold extraction, can solve the problems of harsh storage conditions, and achieve the effects of improved metal recovery rate, easy control, and good working conditions

Inactive Publication Date: 2009-11-04
宋裕华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And SO 2 Store in a cool and ventilated warehouse, away from fire and heat sources. The storage temperature should not exceed 30°C. It must be stored separately from combustibles, oxidants, and reducing agents. The storage conditions are harsh.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] ①. Prepare gold with a grade of not less than 99%, dissolve it completely with aqua regia, do not rush to nitrate or adjust pH, filter after cooling to room temperature, and obtain a relatively pure gold-containing aqua regia solution. 6-7ml of aqua regia is needed to completely dissolve 1g of gold.

[0024] ②. One volume of G·R ether is fully mixed and washed with the same volume of G·R hydrochloric acid, and then separated to obtain the washed ether; then, the ether is washed twice with new G·R hydrochloric acid. Obtain pure ether, discard the hydrochloric acid after use (or use it for other purposes).

[0025] ③. Dissolve A·R NaOH with primary or secondary deionized water, then filter and discard the filter residue to obtain pure NaOH solution.

[0026] ④, A R Na 2 SO 3 Dissolve with primary or secondary deionized water, then filter, discard the filter residue, and concentrate the filtrate to saturation (or crystallization) to obtain pure Na 2 SO 3 .

[0027] ⑤...

Embodiment 2

[0032] ①. Prepare gold with a grade of not less than 99%, dissolve it completely with aqua regia, do not rush to nitrate or adjust pH, filter after cooling to room temperature, and obtain a relatively pure gold-containing aqua regia solution. 6-7ml of aqua regia is needed to completely dissolve 1g of gold.

[0033] ②. One volume of G·R ether is fully mixed and washed with the same volume of G·R hydrochloric acid, and then separated to obtain the washed ether; then, the ether is washed twice with new G·R hydrochloric acid. Obtain pure ether, discard the hydrochloric acid after use (or use it for other purposes).

[0034] ③. Dissolve A·R NaOH with primary or secondary deionized water, then filter and discard the filter residue to obtain pure NaOH solution.

[0035] ④, A R Na 2 SO 3 Dissolve with primary or secondary deionized water, then filter, discard the filter residue, and concentrate the filtrate to saturation (or crystallization) to obtain pure Na 2 SO 3 .

[0036]⑤....

Embodiment 3

[0041] ①. Prepare gold with a grade of not less than 99%, dissolve it completely with aqua regia, do not rush to nitrate or adjust pH, filter after cooling to room temperature, and obtain a relatively pure gold-containing aqua regia solution. 6-7ml of aqua regia is needed to completely dissolve 1g of gold.

[0042] ②. One volume of G·R ether is fully mixed and washed with the same volume of G·R hydrochloric acid, and then separated to obtain the washed ether; then, the ether is washed twice with new G·R hydrochloric acid. Obtain pure ether, discard the hydrochloric acid after use (or use it for other purposes).

[0043] ③. Dissolve A·R NaOH with primary or secondary deionized water, then filter and discard the filter residue to obtain pure NaOH solution.

[0044] ④, A R Na 2 SO 3 Dissolve with primary or secondary deionized water, then filter, discard the filter residue, and concentrate the filtrate to saturation (or crystallization) to obtain pure Na 2 SO 3 .

[0045] ⑤...

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Abstract

The invention relates to the field of gold silver refining technique, more particularly to an extraction method of high-purity gold. The inventive extraction method of high-purity gold comprises the following steps of: 1) gold dissolution; 2) reagent preparation; 3) extraction; 4) acid adjustment; 5) reduction; 6) drying to obtain the product. The inventive extraction method has the following beneficial effects that: the inventive method avoids impurities in chemical reagents like ether entering into an organic phase with osylates, improves quality of high-purity sponge gold, saves one-step extraction process, avoids the conditions like complex operations and abominable working environment resulted from nitrate removal, and has good working conditions and outstanding environment; storage conditions of Na2So3 are not so strict as those of SO2. The invention is simple in operation and easy in control. Added value of industrial benefit of 99.999-99.9999% of gold is several times, even more than ten times than that of 99.99% of gold, thus meeting the industrial demands.

Description

technical field [0001] The invention relates to the technical field of gold and silver refining, in particular to a method for extracting high-purity gold. Background technique [0002] Extract and refine high-purity gold with ether to obtain 99.999% high-purity gold. [0003] Ethyl ether can form pseudocations with acid in high-concentration hydrochloric acid solution (has been nitrated), and Au 3+ The complex anions are combined to form a neutral salt, because the salt is composed of a hydrophobic hydrocarbon group R=C 2 h 5 , the salt is dissolved in excess ether and enters the organic phase, thereby separating from the impurities in the water phase, and after back-extracting with water, use SO 2 Reduction to obtain high-purity sponge gold, and then washing, drying, and casting to obtain high-purity gold ingots. Among the existing technologies, because ether contains a certain amount of impurities, these impurities enter the organic phase with the salt, and the impuri...

Claims

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Application Information

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IPC IPC(8): C22B11/00
Inventor 宋裕华刘建芳杨征孟宪党刘建敏
Owner 宋裕华
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