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Gold nano membrane electrode preparation method and gold refining method

A gold nanometer and membrane electrode technology, applied in the field of gold refining, can solve the problems of excessive gold backlog, long production cycle and low purity in the process, and achieve the effects of improving gold purity, reducing the amount of raw gold and accelerating the precipitation speed.

Inactive Publication Date: 2010-07-07
厦门紫金矿冶技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a preparation method of a gold nano-film electrode and a gold refining method, which overcomes the disadvantages of the background art in gold refining, such as long production cycle, large process gold backlog, large energy consumption, and pollution, and overcomes the shortcomings of the background art The deficiency of low purity in the preparation process of nanometer metal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method of gold nano film electrode, it comprises:

[0031] Step a, first add 0.5mM / LAuCl to the electrolytic cell 3 solution, then add concentrated hydrochloric acid, AuCl 3 solution and concentrated hydrochloric acid to form an electrolyte, and the amount of concentrated hydrochloric acid added is controlled to keep the pH value of the electrolyte less than 1; in this embodiment, AuCl is added successively 3 solution and concentrated hydrochloric acid, but not limited to this, the electrolyte can also be configured first, and then added to the electrolytic cell; in this embodiment, the electrolyte includes AuCl 3 solution and concentrated hydrochloric acid, but also gold chloride complexes (HAuCl 4 ) and free hydrochloric acid solution;

[0032] Step b, placing the electrolytic cell in ultrasonic waves, controlling the ultrasonic frequency at 29kHz;

[0033] Step c, using pure gold (greater than 90%) as the anode and titanium plate as the cathode, the...

Embodiment 2

[0042] The difference between this embodiment and the first embodiment lies in that in step b, the ultrasonic frequency is controlled at 24 kHz; in step d, the electrolysis reaction time is controlled at 5 min. The gold nano-film prepared by the above-mentioned preparation method and controlled parameters has a particle size of gold particles of 70nm and a film thickness of 1000nm.

Embodiment 3

[0044] The difference between this embodiment and embodiment one is: in step a, AuCl 3 The solution is 1mM / L AuCl 3 , solution.

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Abstract

The invention discloses a gold nano membrane electrode preparation method and a gold refining method. The gold nano membrane electrode preparation method comprises the following steps: adding electrolyte into an electrolyzer, wherein the electrolyte is composed of AuCl3 solution and concentrated hydrochloric acid, and the amount of the concentrated hydrochloric acid is controlled to keep pH value of the electrolyte less than 1; putting the electrolyzer in ultrasonic wave with frequency of 20-30kHz; dipping a pure gold anode and a titanium sheet cathode in the electrolyte; and controlling the decomposition voltage to keep asymmetric current density of the electrolyte is within 600-1000A / m2 to enable gold to be separated out at the cathode to develop gold nano membrane to obtain gold nano membrane electrode. The gold nano membrane electrode can be used for asymmetric current high purity gold refining production; the characteristic of electro-catalysis of the gold nano membrane is used for reducing oxidation-reduction potential and improving current density, so as to speed up gold separation at the cathode, reduce the raw material amount of gold, decrease consumption, improve gold purity and the like, thereby realizing better economic and social benefits.

Description

Technical field [0001] The invention relates to a preparation method of a gold nano film electrode and a gold refining method. Background technique [0002] Gold refining at home and abroad mainly adopts electrolytic method, chemical method and extraction method. Among them, the electrolytic refining of gold has been adopted by most of the gold refining enterprises due to the advantages of simple process flow, stable production indicators, and good working environment, but the conventional electrolytic method has the following disadvantages: long production cycle, gold backlog in the process More energy consumption, more serious pollution. [0003] The existing nano-metal powder preparation technology mainly focuses on the hydrothermal synthesis method, such as CN101204655, CN1554503, CN1663715, CN1565727, US20040195107, US20070042116, US20070134407, US20040127353. This method has the following deficiencies: 1. In order to ensure the uniformity and dispersibility of the na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/04C25D3/48C25D5/20C25C1/20C25C7/02
Inventor 罗天长马龙季常青叶志勇刘升明黄怀国
Owner 厦门紫金矿冶技术有限公司
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