Method of extracting and enriching gold (I) from cyaniding gold containing leaching solution

A cyanide leaching, extraction and enrichment technology, applied in the field of smelting technology, can solve the problems of difficult back extraction, low extraction efficiency and the like

Inactive Publication Date: 2009-07-01
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the problems existing in existing amine extractants when extracting gold (I) in cyanidation gold leaching liquid, as it extracts gold in acidic or neutral solution, it obtains a higher extraction rate, but extracts gold under alkaline conditions. Efficiency is low, and it is difficult to back-extract and other problems, the present invention provides a kind of method for extracting and enriching gold (I) in cyanidation gold leaching precious liquid, has overcome the gold (I) extraction efficiency of amine extractant under alkaline condition in the past Problems such as low and difficult stripping

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The hydrochloric acid solution with a concentration of 0.05mol / L and N235 were mixed and contacted in an equal volume ratio for 5 minutes, and then contacted with an equal volume of sodium bicarbonate solution with a concentration of 0.02mol / L. After equilibrium, the organic phase obtained was a modified amine Extracting agent.

[0022] Measure 1 part of modified amine extractant, 1 part of TRPO and 8 parts of kerosene in the extraction tank according to the volume ratio and mix evenly, add 30 parts of gold (I) with an initial concentration of 10.00 mg / L alkaline cyanide leaching gold liquid (feed liquid), stirred or oscillated for 10 minutes to achieve extraction equilibrium, left to stand for phase separation, the extraction rate was 96.31%, and the raffinate continued to be reused; then back-extracted with 10 parts of 0.05mol / L sodium hydroxide solution , the stripping rate reaches 91.5%, and the organic phase after stripping continues to be reused. A good enrichmen...

Embodiment 2

[0024] The sulfuric acid solution with a concentration of 0.02mol / L was mixed and contacted with an equal volume of N235 for 5 minutes, and then with an equal volume of a sodium bicarbonate solution with a concentration of 0.01mol / L. Amine extractant.

[0025] Measure 2 parts of modified amine extractant, 1 part of TRPO and 7 parts of kerosene in the extraction tank according to the volume ratio and mix them evenly, add 50 parts of gold (I) with an initial concentration of 5.44 mg / L of alkaline cyanide gold leaching liquid (feed liquid), stirred or oscillated for 10 minutes to reach extraction equilibrium, left to stand and separated phases, the extraction rate was 96.17%, and the raffinate continued to be reused; then, react with 10 parts of 0.05mol / L sodium hydroxide solution The stripping rate reaches 90.01%, and the organic phase after stripping continues to be reused. A good enrichment effect of extraction and stripping has been obtained. At a lower initial concentratio...

Embodiment 3

[0027] The concentration is that the nitric acid solution of 1.0mol / L and N235 are mixed and contacted for 5 minutes in an equal volume ratio, and then the organic phase obtained after contacting and balancing the sodium bicarbonate solution with an equal volume concentration of 0.1 mol / L is the modified sex amine extractant.

[0028] In the same organic phase composition and volume as in Example 1, add 20 parts of gold (I) with an initial concentration of 21.74 mg / L of gold immersion precious liquid, after reaching the extraction balance, let stand to separate the phases, and measure and calculate the extraction rate 97.37%; then use 10 parts of 0.05mol / L sodium hydroxide for back extraction, the back extraction rate is 90.7%. At a higher initial concentration, good extraction and enrichment effects were also obtained.

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Abstract

The invention discloses an extracting method of gold (I) in the enriched cyanidation leached gold liquid, which comprises the following steps: blending extractant, extracting-assisting agent and diluent with bulk rate at 1-50:1-50:30-98 to form organic phase of extracting system; contacting organic phase and alkaline cyanidation leached gold liquid with bulk rate at 1: 1-25; stirring completely; extracting Au(CN)2- in the organic liquid; proceeding back extraction for organic phase with gold cyano ion and back extractant alkaline solution with bulk rate at 1-20: 1; transmitting gold cyano ion into back extractant; recycling leached gold and organic phase.

Description

technical field [0001] The invention relates to a smelting process, in particular to a method for extracting and separating gold in cyanidation gold leaching liquid. Background technique [0002] my country's gold resources are relatively rich and widely distributed, but the resources of easy-to-select gold mines are very tight, and there are many difficult-to-select, difficult-to-smelt and low-grade gold mines. Therefore, the comprehensive, reasonable and effective development and utilization of refractory gold resources, which account for a large proportion of my country's gold reserves, has important practical significance for the sustainable development of my country's gold resources. In the extraction and smelting of gold, especially in the smelting of refractory, refractory and low-grade gold ores, the cyanide leaching process is still used at present. Therefore, using advanced and practical new technologies to efficiently separate, extract and enrich gold (I) in cyan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/26C22B11/00
CPCY02P10/20
Inventor 李明玉谢羽飞
Owner JINAN UNIVERSITY
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