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Method for separating and extracting gold from cyanide gold-leaching barren solution

A cyanide leaching and extraction technology, applied in the field of separation and extraction of gold, to achieve the effect of fast extraction speed, good extraction effect and low price

Inactive Publication Date: 2011-11-16
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These traditional processes are lengthy, complex, inefficient, and the recovery rate of gold is low; the solvent extraction method is favored by people because of its simple process, fast reaction speed, good separation effect, and easy automation.
However, the solvent extraction method also has shortcomings such as the lack of suitable extractant, the difficulty of stripping and the large loss of the extractant, so that the recovery of gold from the alkaline cyanide gold leaching solution is far from meeting the requirements of industrial applications.

Method used

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  • Method for separating and extracting gold from cyanide gold-leaching barren solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Trialkylphosphine oxide (TRPO) and tributyl phosphate (TBP) are mixed uniformly at a volume ratio of 1:1, and kerosene with a volume percentage concentration of 50% is added to obtain an extracted organic phase;

[0022] (2) Add potassium sulfate solution to the barren solution for cyanidation gold leaching and mix evenly, wherein the initial gold concentration is 26.78mg / L, and the potassium sulfate concentration is 2mol / L. The extracted organic phase and the cyanide gold leaching barren solution were mixed at a volume ratio of 1:10, shaken and contacted at room temperature for 5 minutes, and allowed to stand for phase separation to obtain a gold-loaded organic phase; the measured gold concentration in the raffinate was 1.07 mg / L, and The rate is 96%;

[0023] (3) Under the condition of 60° C., the gold-loaded organic phase obtained in step (2) is back-extracted with water, and the volume ratio (compared to O / A) of water and gold-loaded organic phase is 1: 1 to obt...

Embodiment 2

[0025] (1) Trialkylphosphine oxide (TRPO) and tributyl phosphate (TBP) are mixed uniformly at a volume ratio of 2:1, and xylene with a volume percentage concentration of 90% is added to obtain an extracted organic phase;

[0026] (2) Add potassium chloride solution to the poor cyanidation gold leaching solution and mix evenly, wherein the initial gold concentration is 26.78mg / L, and the potassium chloride concentration is 5mol / L. The extracted organic phase and the cyanide gold leaching barren solution were mixed at a volume ratio of 1:5, shaken and contacted at room temperature for 5 minutes, and allowed to stand for phase separation to obtain a gold-loaded organic phase; the gold concentration of the raffinate was 0.33 mg / L, Grade extraction rate is 98.8%;

[0027] (3) under the condition of 50 DEG C, the sodium chloride solution that the molar concentration is 0.01mol / L carries out back extraction to step (2) gained gold-loaded organic phase, the volume ratio of water and g...

Embodiment 3

[0029] (1) Trialkylphosphine oxide (TRPO) and tributyl phosphate (TBP) are mixed uniformly at a volume ratio of 2:1, and n-dodecane with a volume percentage concentration of 70% is added to obtain an extracted organic phase;

[0030] (2) Add lithium sulfate solution to the cyanide gold leaching barren solution and mix evenly, wherein the initial gold concentration is 50.14mg / L, and the lithium sulfate concentration is 1mol / L. The extracted organic phase and the cyanide gold leaching barren solution were mixed at a volume ratio of 1:5, shaken and contacted at room temperature for 10 minutes, and allowed to stand for phase separation to obtain a gold-loaded organic phase; the gold concentration of the raffinate was 0.5 mg / L, Grade extraction rate is 99.0%;

[0031] (3) under the condition of 60 DEG C, the gold-loaded organic phase obtained in step (2) is back-extracted with a molar concentration of 0.01mol / L sodium chloride solution, and the volume ratio of back-extraction liqui...

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Abstract

The invention discloses a method for separating and extracting enriched gold from cyanide gold-leaching barren solution, which comprises the following steps: evenly mixing trialkyl phosphorus oxide and tributyl phosphate, and adding diluent to obtain extracted organic phase; adding salting-out agent into cyanide gold-leaching solution; adding the extracted organic phase, oscillating and contacting for 1-20 min at the normal temperature, and setting aside for phase-splitting to obtain gold-bearing organic phase, wherein the volume ratio between the extracted organic phase and the cyanide gold-leaching liquid is 1:1-1:20; and carrying out back-extraction on the gold-bearing organic phase by back extracting agent at 40-70 DEG C to obtain back-extracted gold solution. By adopting the method, the extraction ratio reaches more than 96 percent, and the back-extraction ratio reaches more than 90 percent; and the extracted organic phase can be recycled circularly and has remarkable economic and environmental benefits. The invention has simple operation, good extraction effect, simple and easily-obtained extraction agent, low price, less consumption amount, fast extraction speed, short phase-spitting time, higher selectivity, convenient industrial achievement, saved cost and improved efficiency.

Description

technical field [0001] The invention belongs to the field of precious metal metallurgy, in particular to a method for separating and extracting gold from cyanide leaching gold barren solution. Background technique [0002] Since the 1980s, solvent extraction has become an important method for gold enrichment and separation. Phosphorus extractant is a commonly used extractant for gold extraction in gold leaching solution, and has always been a research hotspot. It can extract gold in acidic or neutral solution to obtain a higher extraction rate. In 1983, Miller J.D. studied the addition of neutral phosphorus modifiers such as tributyl phosphate (TBP) and butyl phosphonic acid di-n-butyl ester (DBBP), which can change the apparent alkalinity of amine extractants, making them It can better extract gold from alkaline cyanide solution. Later, people also found that this neutral phosphorus modifier itself can also be used as an extractant for extracting gold from alkaline cyani...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/38C22B11/08
CPCY02P10/20
Inventor 李明玉周丽
Owner JINAN UNIVERSITY
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