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Coarse gold refining method

A crude gold and filter residue technology, which is applied in the field of metallurgy, can solve problems such as insufficient product purity, high pyromelting temperature, and complicated process flow, and achieve the effects of lower gold content requirements, fewer production steps, and simple methods and operations

Active Publication Date: 2017-06-23
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes the shortcomings of the general wet-fire method combination method that the product purity is not high enough, the fire smelting temperature is high, and the process is complicated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The percentage content of each component of crude gold is: gold 70.35%, silver 20.05%, copper 3.32%, iron 3.19%, antimony 1.64%, silicon 1.35%. The implementation steps are as follows:

[0033] (1) Weigh 50.4879g of crude gold powder, add 100mL of 20% nitric acid solution, put it on an electric stove for 2 hours, filter, wash the filter residue I with deionized water three times, and the wet weight of the filter residue is 39.3214g.

[0034] (2) Add 16 g of potassium nitrate to the filter residue I obtained in step (1), mix well, and send it to a muffle furnace for 1.5 hours of roasting at a roasting temperature of 600°C.

[0035] (3) The calcined residue obtained in step (2) was added to 80 mL of 25% potassium hydroxide solution for immersion for 1 hour, filtered, and the filter residue II was washed with deionized water for 3 times.

[0036] (4) The filter residue II obtained in step (3) was added to 80 mL of 15% nitric acid solution for immersion for 1 hour, filtere...

Embodiment 2

[0040]The composition of coarse gold powder is: gold 70.35%, silver 20.05%, copper 3.32%, iron 3.19%, antimony 1.64%, silicon 1.35%. The implementation steps are as follows:

[0041] (1) Weigh 50.3245g of crude gold powder, add 100mL of 20% nitric acid solution by mass, put it on an electric furnace to cook for 1 hour, filter, and wash the filter residue I with deionized water for 3 times, and the wet weight of the filter residue is 38.3214g.

[0042] (2) Add 16 g of potassium nitrate to the filter residue I obtained in step (1), mix well, and send it to a muffle furnace for roasting for 2 hours at a roasting temperature of 500°C.

[0043] (3) The mass fraction of the roasting slag obtained in step (2) is 5%

[0044] Dig with 200 mL of potassium hydroxide solution for 1 h, filter, and wash the filter residue II with deionized water 3 times.

[0045] (4) The filter residue II obtained in step (3) was added with 110 mL of a 15% nitric acid solution to digest for 1 hour, filter...

Embodiment 3

[0049] The composition of coarse gold powder is: gold 81.15%, silver 11.27%, copper 2.37%, iron 2.08%, antimony 1.70%, silicon 1.43%. The implementation steps are as follows:

[0050] (1) Weigh 50.5064g of crude gold powder, add 45mL of 30% nitric acid solution by mass, put it on an electric furnace to immerse for 1 hour, filter, and wash the filter residue I with deionized water for 3 times, and the wet weight of the filter residue is 39.5324g.

[0051] (2) Add 8 g of potassium nitrate to the filter residue I obtained in step (1), mix well, and send it to a muffle furnace for calcination for 1.5 hours at a calcination temperature of 500°C.

[0052] (3) The roasting residue obtained in step (2) was added with 45 mL of potassium hydroxide solution with a mass fraction of 30% to be digested for 1 hour, filtered, and the filter residue II was washed three times with deionized water.

[0053] (4) The filter residue II obtained in step (3) was added with 45 mL of 30% nitric acid s...

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Abstract

The invention relates to a coarse gold refining method. The coarse gold refining method includes the following specific steps that (1) coarse gold is digested with a salpeter solution, and a filter residue I is obtained by means of filtering; (2) potassium nitrate is added into the filter residue I, roasting is performed after the potassium nitrate and the filter residue I are evenly mixed, and accordingly roasting slag is obtained; (3) a potassium hydroxide solution is added into the roasting slag for digestion, and a filter residue II is obtained by means of filtering; (4) the filter residue II is digested with nitric acid, and a filter residue III is obtained by means of filtering; and (5) hydrochloric acid and hydrogen peroxide are added into the filter residue III for reacting, filter liquor is obtained by means of filtering, and powdered gold can be obtained through treatment. The purity of the powdered gold refined through the method is 99.99% or above, and the method overcomes the defects that a common wet process-pyrogenic process combination product is low in purity, high in smelting temperature, complex in technological process and long in period.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a crude gold refining technology. Background technique [0002] Gold is a metal discovered and utilized by human beings earlier. Due to its rarity, specialness and preciousness, it has been regarded as the head of hardware since ancient times and has the title of King of Metals. It has extremely high anti-corrosion stability, good electrical conductivity and thermal conductivity. The atomic nucleus of gold has a large effective cross-section for capturing neutrons, and it has various catalytic properties in gold alloys. [0003] At present, the main refining methods include electrolysis, extraction, full wet refining, and combined wet-fire refining. [0004] The basic principle of electrolytic refining is: use crude gold as the anode, under the action of direct current, gold and other more electronegative metals enter the electrolyte in the form of ions, because the concentratio...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B9/00
CPCC22B9/00C22B11/00Y02P10/20
Inventor 陈兰粟明辉黄鹏飞李环杨跃新
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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