Production process of high-purity gold

A production process and pure gold technology, which is applied in the field of high-purity gold production process, can solve the problems of long electrolysis production cycle, volatile extraction agent, and potential safety hazards, so as to shorten the gold melting process cycle, speed up the gold melting speed, and reduce the price. cheap effect

Inactive Publication Date: 2021-01-12
深圳市点金贵金属精炼有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the electrolysis method has the disadvantages of long production cycle, poor operating conditions, and large gold backlog; while the solution extraction method uses extraction agents such as ether and dibutyl carbitol to prepare high-purity gold, but the high-purity gold produced by it is easy to wrap organic solvents. Thereby affecting the purity of gold; in addition, the extraction agent is extremely volatile, the production environment is poor, and there are potential safety hazards in the operation process

Method used

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  • Production process of high-purity gold
  • Production process of high-purity gold
  • Production process of high-purity gold

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Embodiment 1

[0041] Embodiment 1, a kind of production technique of high-purity gold, concrete production steps are as follows:

[0042]S1. Aqua regia soluble gold: put crude gold 1kg (gold content 99.000%) in the reactor, add 4L aqua regia in the reactor, aqua regia is the concentrated hydrochloric acid (mass fraction 37%) that volume ratio is 3:1 and concentrated Nitric acid (mass fraction 68%) is prepared. After the gold dissolving reaction is basically completed and the solution temperature drops to room temperature, add the nitration agent urea into the reactor at a uniform speed of 100g / min to catch the nitrate, and monitor the redox potential in the solution in real time. When the reduction potential E1 reaches 700mV, the dosing of urea is stopped, and the nitration rush is stopped, and the total amount of urea added during the nitration rush is 0.60kg. After the nitration process is stopped, the solution is filtered with a high-precision precision filter to obtain a crude gold sol...

Embodiment 2

[0046] Embodiment 2: A production process of high-purity gold. The difference between this embodiment and Embodiment 1 is that in step S1, when the oxidation-reduction potential E1 in the solution reaches 750mV, the dosing of urea is stopped, the nitration is stopped, and the nitration process is stopped. The total amount of urea added in the medium is 0.65kg. In step S2, the redox potential E2 is always controlled at 425mV, the dosage of reducing agent sodium sulfite is 0.65kg, and the reduction time t is 55min. In step S3, the number of times n of the fine gold powder being soaked in the nitric acid solution is 3 times, and the soaking time in nitric acid is 0.65 h each time.

Embodiment 3

[0047] Embodiment 3: A production process of high-purity gold. The difference between this embodiment and Embodiment 1 is that in step S1, when the oxidation-reduction potential E1 in the solution reaches 800mV, the dosing of urea is stopped, and the nitration process is stopped. The total amount of urea added was 0.70 kg. In step S2, the redox potential E2 is always controlled at 450mV, the total amount of reducing agent sodium sulfite added is 0.70kg, and the reduction time t is 60min. In step S3, the number of times n of the fine gold powder being soaked in the nitric acid solution is 4 times, and the soaking time in nitric acid is 0.75 h each time.

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Abstract

The invention discloses a production process of high-purity gold, and relates to the technical field of metal refining. The production process comprises the following steps that: S1, gold is dissolvedin aqua regia, wherein crude gold is added to aqua regia and dissolved to make a solution, and after nitrate is removed, filtering is conducted to obtain a crude gold solution; S2, reduction is conducted, wherein a reducing agent is added to the crude gold solution obtained in S1, filtering is conducted to obtain primary fine gold powder, and the primary fine gold powder is washed with pure wateruntil the primary fine gold powder is neutral; S3, acid leaching is conducted, wherein the primary fine gold powder obtained in S2 is put into a nitric acid solution, soaked and then filtered, and pure fine gold powder is obtained; and S4, gold smelting is conducted, wherein the pure fine gold powder obtained in S3 is washed with pure water, dried, inspected, and used for preparing the high-purity gold product through ingot casting after being inspected to be qualified. The production process has the technical effects of high production safety, short process flow period and good controllability.

Description

technical field [0001] The invention relates to the technical field of metal refining, in particular to a production process of high-purity gold. Background technique [0002] High-purity gold refers to gold products with a purity of 99.999%, marked as Au99999. High-purity gold is the necessary raw material for the production of gold wires for semiconductor connections. It has good manufacturability and can be easily processed into ultra-thin gold foil, micron gold wire and gold powder, and plated on the surface of other metals, pottery and glass. High-purity gold is welded and forged under a certain pressure, and can also be made into superconductors and organic gold, which can be widely used in modern high-tech enterprises such as electronic technology, communication technology, aerospace technology, chemical technology, and medical technology. [0003] At present, high-purity gold production processes include electrolysis, solvent extraction and chemical reduction. Amon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00
CPCC22B11/04
Inventor 施巍
Owner 深圳市点金贵金属精炼有限公司
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