Ammonium thiocyanate-cetylpyridinium bromide-water system flotation separation method for gold

A technology of bromide cetylpyridine and ammonium thiocyanate, applied in the field of precious metal separation and purification, can solve the problems of environmental pollution, toxicity, low mass transfer rate, etc., achieves rapid separation and enrichment method, good application prospect, The effect of low separation cost

Inactive Publication Date: 2020-12-25
郭鹏 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional liquid-liquid extraction separation and enrichment methods mainly use organic solvents that are immiscible with water as the extraction solvent. This heterogeneous extraction heterogeneous separation extraction method has a low mass transfer rate and a small distribution. The purpose of quantitative extraction can only be achieved by shaking for a long time and multiple extractions. The workload is relatively large, and most of the extraction solvents used are often volatile, flammable and toxic, which not only does great harm to the operator, but also causes environmental pollution. , so the application is limited; secondly, the existing separation and enrichment methods are suitable for solutions with high concentration of gold ions, and cannot achieve separation and enrichment for trace amounts of gold ions

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  • Ammonium thiocyanate-cetylpyridinium bromide-water system flotation separation method for gold
  • Ammonium thiocyanate-cetylpyridinium bromide-water system flotation separation method for gold
  • Ammonium thiocyanate-cetylpyridinium bromide-water system flotation separation method for gold

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Embodiment 1

[0032] This embodiment provides the method for ammonium thiocyanate-cetylpyridinium bromide-water system flotation separation of gold, comprising the following steps:

[0033] (1) Add ammonium thiocyanate solution to the flotation solution, stir the solution until completely mixed to obtain mixed solution A;

[0034] (2) Add cetylpyridinium bromide solution to the mixed solution A to obtain the mixed solution B, add Clark-Lubes buffer dropwise to adjust the pH to 4.0, and stir until all the precipitates are separated out;

[0035] (3) Filter the mixed solution obtained in step (2), obtain the precipitate, transfer it to a beaker, add water and boil for 2-4 times, filter, and wash with water;

[0036] (4) Bake the precipitate obtained in step (3) at 200°C for 10 hours to obtain solid gold;

[0037] Wherein the relative concentration of ammonium thiocyanate in solution A is 2.0×10 -2 mol / L, the relative concentration of cetylpyridinium bromide in solution B is 4.0×10 -3 mol / L...

Embodiment 2

[0041] This embodiment provides the method for ammonium thiocyanate-cetylpyridinium bromide-water system flotation separation of gold, comprising the following steps:

[0042] (1) Add ammonium thiocyanate solution to the flotation solution, stir the solution until completely mixed to obtain mixed solution A;

[0043] (2) Add cetylpyridinium bromide solution to the mixed solution A to obtain the mixed solution B, add Clark-Lubes buffer dropwise to adjust the pH to 4.0, and stir until all the precipitates are separated out;

[0044] (3) Filter the solution obtained in step (2), obtain the precipitate, transfer it to a beaker, add water and boil for 2-4 times, filter, and wash with water;

[0045] (4) Bake the precipitate obtained in step (3) at 200°C for 10 hours to obtain solid gold;

[0046] Wherein the relative concentration of ammonium thiocyanate in solution A is 2.0×10 -2 mol / L, the relative concentration of cetylpyridinium bromide in solution B is 4.0×10 -3 mol / L.

[...

Embodiment 3

[0050] This embodiment provides the method for ammonium thiocyanate-cetylpyridinium bromide-water system flotation separation of gold, compared with Example 1, the difference is that the concentration of the ammonium thiocyanate in the A solution 1.0×10 -2 mol / L, the concentration of said cetylpyridinium bromide in solution B is 2.0×10 -3 mol / L.

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Abstract

The invention discloses a method for separating gold by ammonium thiocyanate-cetylpyridinium bromide-water system flotation, Au(SCN) produced by gold (Ⅲ) and ammonium thiocyanate 4 ‑ The anion can form a water-insoluble ternary association Au(SCN) with the cetylpyridinium bromide cation 4 ‑ ·CPB + , this ternary association can float on the upper layer of the brine phase and divide into liquid-solid two phases with a clear interface, Au(Ⅲ) is quantitatively flotation, while Cd(II), Cr(Ⅲ), Ga(Ⅲ), Co( II), Fe(II), Ni(II), Al(Ⅲ), Mn(II), V(Ⅴ) ions are basically not floated in this system, thus realizing the separation of Au(Ⅲ) and impurity ions .

Description

technical field [0001] The invention relates to the technical field of separation and purification of precious metals, in particular to a method for separating gold by flotation in an ammonium thiocyanate-cetylpyridinium bromide-water system. Background technique [0002] At present, domestic and foreign gold refining and purification methods mainly include: electrolysis method, aqua regia method, liquid chlorine method, and chlorination method. Among them, the electrolysis method has a simple process, less pollution, and the purity of the purified gold can reach 99.99%, but the electrolysis method requires high technical conditions. , a large amount of gold needs to be backlogged; the aqua regia method has a long production cycle, serious environmental pollution, and needs to catch up with nitrate, a large amount of liquid needs to be processed, and the operation is complicated and difficult to master; the liquid chlorine method is mainly to feed chlorine gas as an oxidant. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B3/40
CPCC22B11/04C22B3/36Y02P10/20
Inventor 郭鹏李勇黄道丹王珍马冬冬王亚萍赵李红
Owner 郭鹏
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