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Method for extracting gold from alkaline cyanide solution

An extraction and alkaline technology, applied in the field of gold extraction, can solve the problems of easy failure, high price of reversed-phase bonded silica gel, and difficult cost, and achieve the effects of low organic solvent consumption, easy operation and automation, and low pollution.

Inactive Publication Date: 2009-09-23
YUXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, octadecyl bonded silica gel (C 18 ) when used to extract gold in alkaline cyanide solution, its enrichment multiple and extraction recovery rate are unmatched by traditional liquid-liquid extraction technology
But at the same time, it is also found that the applicable pH of the reversed-phase bonded silica stationary phase is narrow (pH2-8, and the pH range of special bonded silica can reach 1-12), and the use stability is poor under alkaline conditions, and it is easy to fail
Moreover, the price of reverse-phase bonded silica gel is high, exceeding ten thousand yuan per kilogram, and the cost is difficult to be accepted by the production unit. Reversed-phase solid-phase extraction materials that are highly stable and can be used repeatedly under alkaline conditions become the key to the technology

Method used

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  • Method for extracting gold from alkaline cyanide solution
  • Method for extracting gold from alkaline cyanide solution
  • Method for extracting gold from alkaline cyanide solution

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Extraction of gold from alkaline cyanide solution. Weigh the porous graphitized carbon black of 100g particle size 30 μm and place in a 500mL dry beaker, add 50mL of 10% (m / v) dihexadecyldimethylammonium chloride acetone solution under constant stirring, Evaporate to dryness in a water bath at 65°C to obtain graphitized carbon black loaded with dihexadecyldimethyl. The specification of the solid phase extraction column is 20×25mm, and the filling material is 8.2g (see figure 1 ). Install a sieve plate at one end of the filling tube, load graphitized carbon black with dihexadecyl dimethyl and compact it, then install a sieve plate at the other end, and tighten the column cap. The extraction cartridge was washed with dilute sodium hydroxide at pH 9.4. Solid phase extraction (see figure 2 ): Prepare KAu(CN) 2 The solution, with a concentration of 2 mg / L, was adjusted to a pH of 9.4, enriched by a solid-phase extraction column at a flow rate of 10 mL / min, and then elu...

Embodiment 2

[0029] Example 1 was repeated with the following difference: the particle size of the porous graphitized carbon black was 45 μm. The surfactant is octadecyltrimethylammonium chloride. Evaporate to dryness in a 60°C water bath with stirring. Solid phase extraction column specifications: 8mm diameter x 10mm column length, 0.5g packing. The extraction cartridge was washed with dilute sodium hydroxide at pH 11. Prepare KAu(CN) with a concentration of 15mg / L 2 The solution was adjusted to have a pH of 11, enriched by a solid-phase extraction column at a flow rate of 50 mL / min, and then eluted in the reverse direction at a flow rate of 30 mL / min with 300 mL of eluent.

Embodiment 3

[0031] Example 1 was repeated with the following difference: the particle size of the porous graphitized carbon black was 60 μm. The surfactant is octadecyl dimethyl benzyl ammonium chloride. The specification of the solid phase extraction column is 12mm diameter × 15mm, and the filling material is 200g. The extraction cartridge was washed with dilute sodium hydroxide at pH 13. Prepare KAu(CN) with a concentration of 24mg / L 2 The solution was adjusted to have a pH of 13, enriched by a solid-phase extraction column at a flow rate of 100 mL / min, and then eluted in the reverse direction at a flow rate of 50 mL / min with 500 mL of eluent.

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Abstract

The invention discloses a method for extracting gold from alkaline cyanide solution. Porous graphitized carbon black and surfactant acetone solution with the concentration of 10 percent are evaporated in a water bath by stirring, thereby obtaining a graphitized carbon black packing with the attached surfactant. The packing is arranged in a solid-phase extraction column for compaction and washed by dilute sodium hydroxide with pH of 9.4-13 for standby. Gold-containing material liquid passes through the extraction column at the flow rate of 10-100mL / min for extraction and enrichment, then eluate is further used for reverse elution, and the gold in the eluate is finally recovered by the electric deposition method. The method has small environmental pollution, the operable pH range is very wide, the one-time extraction rate of the gold exceeds 96.5 percent, the enrichment times are more than 250 times, and the extraction capacity of the material to the gold is greater than 29mg / g, thereby having a good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for extracting gold from alkaline cyanide solution by using solid-phase extraction technology. Background technique [0002] The cyanidation method has been applied to the gold extraction process at the beginning of the last century. Because of its high recovery rate, simple process, and low unit cost, it has rapidly spread to gold mines all over the world, bringing human gold extraction technology into a new pioneering stage. At present, most of the treatment processes for gold enrichment in cyanidation leachate adopt the traditional zinc powder replacement method or activated carbon adsorption. Since the selectivity of these two methods to gold is not high enough, the obtained gold mud (intermediate product) still needs to undergo more complex follow-up refining treatment, resulting in long production cycle, increased environmental pollution and increased cos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/24C25C1/20
CPCY02P10/20
Inventor 胡秋芬徐祎然范鹏杨光宇
Owner YUXI NORMAL UNIV
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