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A method for extracting and purifying gold from a gold mine

A technology for gold ore and crude gold, applied in the field of gold extraction and purification from gold ore, can solve problems such as insufficiency, and achieve the effects of reducing usage, reducing gas production, and reducing environmental pollution

Active Publication Date: 2017-10-24
GUIZHOU YIHUAZHUANG DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it still cannot meet the demand for gold extraction and purification, so it is necessary to continuously improve the process of gold extraction and purification to achieve the purpose of low cost, low energy consumption, low consumption, high quality extraction and purification of gold

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for extracting and purifying gold from a gold mine, comprising the following steps:

[0030] (1) Grinding gold ore into powder, and extracting gold by hydrometallurgy to obtain coarse gold powder;

[0031] (2) Mix the coarse gold powder and the syrup evenly according to the mass ratio of 1:2, heat to 80°C, and filter after 20 minutes to obtain the filtrate and filter cake;

[0032] (3) Send the filtrate to immersion silver for treatment, add aqua regia to the filter cake, the amount of aqua regia added is 3 times the mass of the filter cake, heat to 80°C, stir, cool to normal temperature, filter to get the filtrate a and filter cake a;

[0033] (4) Filtrate a and distilled water are mixed according to equal volumes, and feed chlorine gas, and feed amount is that the mol ratio with distilled water is 1:1, after it reacts for 1h, then add saturated oxalic acid solution under normal temperature condition, add-on amount is 120% of the quality of the filtrate a, a...

Embodiment 2

[0037] A method for extracting and purifying gold from a gold mine, comprising the following steps:

[0038] (1) Grinding gold ore into powder, and extracting gold by hydrometallurgy to obtain coarse gold powder;

[0039] (2) Mix the coarse gold powder and the syrup evenly according to the mass ratio of 1:3, heat to 90°C, and filter for 30 minutes to obtain the filtrate and filter cake;

[0040](3) Send the filtrate to immersion silver for treatment, add aqua regia to the filter cake, the addition of aqua regia is 4 times the quality of the filter cake, and heat to 90 ° C, stir, after cooling to normal temperature, filter to obtain the filtrate a and filter cake a;

[0041] (4) Filtrate a and distilled water are mixed according to equal volumes, feed chlorine gas, and feed amount is that the mol ratio with distilled water is 1:1, after it reacts for 3h, then add saturated oxalic acid solution under normal temperature condition, add-on amount is 150% of the quality of the fil...

Embodiment 3

[0046] A method for extracting and purifying gold from a gold mine, comprising the following steps:

[0047] (1) Grinding gold ore into powder, and extracting gold by hydrometallurgy to obtain coarse gold powder;

[0048] (2) Mix the coarse gold powder and the syrup evenly according to the mass ratio of 1:2.5, heat to 85°C, and filter after 25 minutes to obtain the filtrate and filter cake;

[0049] (3) Send the filtrate to immersion silver for treatment, add aqua regia to the filter cake, the amount of aqua regia added is 3.5 times the mass of the filter cake, and heat to 85 ° C, stir, after cooling to normal temperature, filter to obtain the filtrate a and filter cake a;

[0050] (4) Filtrate a and distilled water are mixed according to equal volumes, feed chlorine gas, and feed amount is that the mol ratio with distilled water is 1:1, after it reacts for 2h, then add saturated oxalic acid solution under normal temperature condition, add-on amount is 140% of the quality of...

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PUM

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Abstract

The invention relates to the technical field of gold purification, in particular to a method for extracting and purifying gold in gold ore. After gold is extracted from gold ore powder through wet smelting, obtained coarse gold powder and a solution are mixed for acting, and therefore silver ingredients in the gold ore powder are greatly reduced, a large amount of silver is dissolved and acts in filter liquor through the solution, and gold, platinum and other ingredients hard to dissolve are left in a filter cake; and elemental silver, elemental gold and elemental platinum are subjected to coarse separation, the usage amount of subsequent aqua regia is reduced, cost is reduced, the amount of gas generated when nitric acid in the aqua regia is removed later can be reduced, and environment pollution can be reduced.

Description

technical field [0001] The invention relates to the technical field of gold purification, in particular to a method for extracting and purifying gold from gold mines. Background technique [0002] As a precious metal, gold is a product obtained by extracting and purifying gold after mining it; its mining is difficult and costly. Gold has good physical properties and a high melting point at 1064.43°C, which makes gold difficult to melt. Moreover, gold has high density, good toughness and ductility. [0003] In the prior art, the processing methods for gold and silver materials are mainly melt chlorination and wet separation of gold and silver; among them, the melt chlorination method needs to use electrolysis in the process of processing, which makes the gold production cycle longer , the cost is high; the wet separation method of gold and silver, most of which use aqua regia leaching treatment, and use oxalic acid to reduce the sponge gold, and then melt and cast it to obta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B3/08C22B3/42C22B3/46
CPCC22B3/08C22B3/42C22B3/46C22B11/04Y02P10/20
Inventor 李开元
Owner GUIZHOU YIHUAZHUANG DEV CO LTD