In China, the process conditions of each gold- charging workshop are different. Only a few representative technical conditions for workshops are available:
1. Henan Yindongpo gold loaded carbon atmospheric desorption parameters:
Sodium hydroxide concentration 2%
Sodium cyanide concentration 5%
Desorption temperature 95～98°C
Desorption time 14 to 16 hours Desorption liquid flow rate 0.1 liter / sec Desorption method The gold-loaded carbon is charged into the desorption tower, and the desorbed liquid heated by the heat exchanger is added to the desorption column, and is heated by an electric heater to the desorption temperature required by the process, and then desorbed. Release the precious liquid after desorption. Then, the electrolytic lean liquid or clean water is used to carry out the desorption tower washing charcoal at the desorption temperature, the desorbed noble liquid and the washing liquid are combined, and the mixture is cooled by a heat exchanger, and the filter is removed and then fed into the electrolytic tank.
2. Process parameters of pressurized charcoal desorption in Zhangjiakou gold deposit, Hebei Province:
Sodium hydroxide concentration 1.0%
Sodium cyanide concentration 1.0%
Desorption temperature 135 ° C
Desorption pressure 310 kPa desorption time 24 hours Desorption liquid flow rate 0.84 liters / sec Desorption method: The gold-loaded charcoal is charged into the desorption column by a jet pump, heated by heat exchanger (conversion liquid, electrolytic lean liquid and water), and then After heating to the process requirements by the electric heater, the desorption column is desorbed to remove gold and silver. The eluted noble liquid of the desorption operation is filtered by a filter, the filter cake (loaded with gold charcoal) is sent for smelting, and the filtrate (precious liquid) is cooled by a heat exchanger and sent to electrolysis.
3. Electrolysis parameters of metallurgical workshop of Tongbai County Gold Company in Henan Province:
Tank voltage 4～4.5V Cathode current density 15～20A/ m2
Electrolyte flow rate 200 ~ 3000 l / m 2 • minutes Electrolysis temperature 25 ~ 40 ° C
Electrolysis time 18~20 hours 4. The operating conditions of the decarbonization regeneration technology are more consistent. The process parameters are as follows:
Pickling is carried out by soaking in a hydrochloric acid solution having a concentration of 3 to 5% for 3 to 4 hours to reduce the amount of calcium carbonate therein to 10% or less.
Drying After separating the charcoal from the acid, rinse with water to neutrality. Dry at temperatures below 100 °C.
Activation The charcoal is charged into a rotary kiln, heated to 600 ° C or higher, and then steamed for 10 to 15 minutes, and then discharged into a cooling cylinder. The cooled charcoal is sieved and classified, and the return adsorption operation is greater than 16 mesh.
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