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Stage desorption and electrodeposition method for high gold and silver loaded carbon

A technology of gold-loaded carbon and electrodeposition, which is applied in the field of metallurgy, can solve the problems of high gold and silver content in poor carbon, long desorption time, and large gold and silver backlog, and achieve low gold and silver content in poor carbon, short desorption time, and valuable metals. The effect of less content

Inactive Publication Date: 2015-07-01
YUNNAN DIANJIN INVESTMENT CO LTD
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Problems solved by technology

[0003] However, in the process of use, it is found that the above two methods have a low desorption rate when desorbing high-gold-silver-loaded carbon, and the gold-silver content in poor carbon is high, and the desorption time is long, resulting in a large backlog of gold and silver in the system, resulting in backlog costs. higher

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  • Stage desorption and electrodeposition method for high gold and silver loaded carbon

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Embodiment 1

[0040] The test was carried out in a high-temperature and high-pressure cyanide-free desorption device using the segmented desorption method according to the present invention. The process parameters of the first stage of desorption are: temperature is 110°C, system pressure is 0.25Mpa, desorption liquid flow rate is 4m 3 / h, the electrowinning direct current is 800A, the electrowinning cell pressure is 2.5V, the desorption time is 4 hours, and the desorption liquid is 2% NaOH solution. The process parameters of the second stage of desorption are: temperature is 148°C, system pressure is 0.45Mpa, desorption liquid flow rate is 4m 3 / h, the direct current of electrowinning is 800A, the voltage of the electrowinning tank is 2.5V, the desorption time is 7.5 hours, the desorption liquid is 2% NaOH, and the gold-containing product in the poor solution is ≤1μg / ml.

[0041] Specifically, the control of the two-stage process operation is as follows:

[0042] The first high-temperatur...

Embodiment 2

[0045] The operating method of embodiment 2 is the same as embodiment 1, and the process parameter of embodiment 2 is as follows. The process parameters of the first stage of desorption are: temperature is 115°C, system pressure is 0.25Mpa, desorption liquid flow rate is 4m 3 / h, the electrowinning direct current is 800A, the electrowinning cell pressure is 4V, the desorption time is 3 hours, and the desorption liquid is 3% NaOH solution. The process parameters of the second stage of desorption are: temperature is 152°C, system pressure is 0.45Mpa, desorption liquid flow rate is 4m 3 / h, the electrowinning direct current is 800A, the electrowinning tank pressure is 4V, the desorption time is 7 hours, the desorption liquid is 3% NaOH, and the gold-containing product in the poor solution is ≤1μg / ml.

Embodiment 3

[0047] The operating method of embodiment 3 is the same as embodiment 1, and the process parameter of embodiment 3 is as follows. The process parameters of the first stage of desorption are: the temperature is 105°C, the system pressure is 0.25Mpa, and the desorption liquid flow rate is 4m 3 / h, the electrowinning direct current is 800A, the electrowinning cell pressure is 4V, the desorption time is 3.5 hours, and the desorption liquid is 2.5% NaOH solution. The process parameters of the second stage of desorption are: temperature is 150°C, system pressure is 0.45Mpa, desorption liquid flow rate is 4m 3 / h, the electrowinning direct current is 800A, the electrowinning tank pressure is 4V, the desorption time is 8 hours, the desorption liquid is 2.5% NaOH, and the gold-containing product in the poor solution is ≤1μg / ml.

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Abstract

The invention discloses a stage desorption and electrodeposition method for high gold and silver loaded carbon, which comprises two desorption and electrodeposition steps: S1, adding a desorption solution into high gold and silver loaded carbon, and then performing first-stage high-temperature high-pressure cyanide-free desorption and electrodeposition for 3-4 hours at 105-115 DEG C; and S2, after S1, performing second-stage high-temperature high-pressure cyanide-free desorption and electrodeposition for 7-8 hours at 148-152 DEG C to obtain crude gold, crude silver and lean carbon. According to the stage desorption and electrodeposition method for high gold and silver loaded carbon, provided by the embodiment of the invention, the desorption time is relatively short, the desorption rate is high, and the operation process is easy to control.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a desorption of gold and silver in gold-loaded carbon, and more specifically to a staged desorption electrowinning method for high-gold and silver-loaded gold carbon. Background technique [0002] In the gold smelting industry, gold is usually extracted by organic solvent desorption and high temperature and high pressure cyanide-free desorption electrowinning. The organic solvent desorption method is to add 10-20% alcohol solution to the 10g / L NaOH-1g / L NaCN mixed solution system, and carry out normal pressure rinsing at a temperature of 80°C; Under the conditions of ℃ and high pressure of 0.45MPa, 2-3% NaOH is used as the desorption agent to achieve the purpose of desorbing electrolytic gold from gold-loaded carbon quickly and efficiently. This method is widely used. [0003] However, in the process of use, it is found that the above two methods have a low desorption rate wh...

Claims

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Application Information

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IPC IPC(8): C22B11/00C25C1/20
Inventor 梁祖祯陈德海刘俊林张松柏刘波
Owner YUNNAN DIANJIN INVESTMENT CO LTD
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