Method and apparatus for directly synthesizing auro-potassium cyanide by controlling electric potential

A technology of potassium aurous cyanide and potassium cyanide, which is applied in the field of actual production equipment and direct synthesis of potassium aurous cyanide with improved control potential, which can solve problems affecting product quality, inability to use industrialized production, and large loss of raw materials. , to achieve the effect of eliminating the dead angle of poor mixing, stable product quality and improving recovery rate

Inactive Publication Date: 2004-12-22
张东山
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main problems in this method are: long technological process, large loss of raw materials, high cost, and low purity of the produced product
The method has been proved by tests: it overcomes the difficult problem of directly synthesizing potassium aurous cyanide with gold, potassium cyanide and hydrogen peroxide in the prior art, that is, hydrogen peroxide is unstable in the reaction and decomposes when encountering gold; Product quality and other issues
However, this method is still in the laboratory stage, and its process conditions, such as the suitable control range of the gold potential value, the amount and speed of raw material addition, the stirring effect, etc., all need to be further improved; the structure of the reaction vessel of the shown equipment is only It is limited to laboratory use and cannot be used in industrial production yet, and needs to be improved urgently

Method used

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  • Method and apparatus for directly synthesizing auro-potassium cyanide by controlling electric potential
  • Method and apparatus for directly synthesizing auro-potassium cyanide by controlling electric potential

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0040] The specific operation steps of direct synthesis potassium aurous cyanide process method of control potential are as follows:

[0041] First, weigh 2kg of gold powder and 4.5l of hot water at 60-80°C according to the weight / volume ratio, add them into the reaction vessel, and stir thoroughly. Adjust the rotation speed of the stirrer 2 to suspend all the gold powder in the reaction vessel 1, and keep the rotating gold-containing solution relatively stable without splashing.

[0042] Under stirring conditions, through the potassium cyanide solution reservoir 3 and the hydrogen peroxide solution reservoir 4 with the control valve, gradually add the potassium cyanide solution with a concentration of 400g / l in the reaction vessel, and the addition speed is 120ml / min , add a hydrogen peroxide solution with a concentration of 30%, and the addition speed is 20ml / min, adjust the addition speed according to the display value of the potentiometer 7 and the temperature display inst...

Embodiment approach 2

[0044] The specific operation steps of direct synthesis potassium aurous cyanide process method of control potential are as follows:

[0045] Put 2kg of gold powder and 4.5l of hot water at 60-80°C into the reaction vessel and stir thoroughly. Suspend all the gold powder in the reaction vessel 1, and keep the rotating gold-containing solution relatively stable without splashing.

[0046] Under stirring conditions, through the potassium cyanide solution reservoir 3 and the hydrogen peroxide solution reservoir 4 with the control valve, gradually add the potassium cyanide solution with a concentration of 400g / l in the reaction vessel, and the addition speed is 180ml / min , adding concentration is the hydrogen peroxide solution of 30%, and adding rate is 30ml / min, adjusts its adding rate according to the display value of potentiometer 7 and temperature display instrument 13: adjusting method is the same as embodiment one, treats that potassium cyanide solution has been added After...

Embodiment approach 3

[0048] The specific operation steps of direct synthesis potassium aurous cyanide process method of control potential are as follows:

[0049] Put 2kg of gold powder and 4.5l of hot water at 60-80°C into the reaction vessel and stir thoroughly. Suspend all the gold powder in the reaction vessel 1, and keep the rotating gold-containing solution relatively stable without splashing.

[0050] Under stirring conditions, through the potassium cyanide solution reservoir 3 and the hydrogen peroxide solution reservoir 4 with the control valve, gradually add the potassium cyanide solution with a concentration of 400g / l in the reaction vessel, and the addition speed is 120ml / min , adding a hydrogen peroxide solution with a concentration of 30%, the adding speed is 20ml / min, adjust the adding speed according to the display value of the potentiometer 7 and the temperature display instrument 13: when the gold electrode potential value is lower than -530mV, add cyanide The potassium cyanide ...

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Abstract

The invention utilizes the reaction container with built-in stirrer, temperature sensor, gold electrode, reference electrode and baffle-plate and the equipments of temperature display, potentiometer and potassium cyanide solution and hydrogen peroxide solution storage tanks with control valves, and uses the gold powder, potassium cyanide and hydrogen peroxide as raw materials in the reaction container, and controls the speed of adding solutions in the course of reaction and adopts proper gold potential and temperature to directly synthesize potassium aurocyanide. Said invention is reasonable in structure design, small in volume and stable in performance, safe and reliable.

Description

technical field [0001] The invention relates to a method and equipment for producing potassium aurous cyanide, in particular to an improved method for directly synthesizing potassium aurous cyanide by controlling potential and equipment for actual production. Background technique [0002] It is well known that potassium aurous cyanide (KAu(CN) 2 ), commonly known as gold salt, is mainly used in gold plating process. According to related literature reports, the purity of potassium aurous cyanide directly affects the quality of coating and the life-span of plating solution. There are many production methods of potassium aurous cyanide, and the purity of potassium aurous cyanide obtained by different production methods varies. [0003] The domestic production of potassium aurous cyanide mainly adopts traditional cyanidation method, fulminate gold method and drum oxygen cyanide method. [0004] The cyanidation method is used to extract gold from ores. Although this method has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C3/11C01G7/00
CPCC01C3/11C01G7/00
Inventor 张东山
Owner 张东山
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