The activated carbon adsorption of gold in the noble liquid is usually carried out by using 2 to 5 adsorption columns (or tanks) in series. The carbon column with a diameter of 0.6m and a height of 1.8m can be welded with carbon steel plates of 5 to 6.5mm. Each column is filled with carbon of about 90kg, accounting for one-third of the column capacity. The column is arranged in a stepwise manner or the liquid is self-flowing by the height difference of the high-position tank, and the carbon is kept in the column in a suspended state by controlling the flow rate of the solution at a certain flow rate from the bottom to the top. In order to prevent the char from flowing away with the solution, a stainless steel screen is installed in the inlet and outlet ports of the column (when -3.327 to 0.991 mm (-6 to +16 mesh) carbon is used, a 0.833 mm (20 mesh) screen is used). The structure of the adsorption column is shown in Fig. 1. When a certain volume of precious liquid is passed and the gold loading of the carbon column 1 is saturated, the column 2 is changed to a column, the original column is replaced with a new carbon and then changed to the last column, and so on.
Figure 1 Carbon column structure
1-lean outlet; 2-screen;
3-discharge port; 4-your liquid inlet; 5--remaining liquid port
When the amount of gold and silver in the noble liquid is high, an appropriate amount of Na 2 S is added according to the amount of silver before carbon adsorption, and about 85% of the silver is precipitated into Ag 2 S, and then carbon adsorption is performed. Na 2 S is added in an amount not in excess should be strictly controlled in order to avoid remaining in the liquid S 2 - Effect of charcoal on gold.
The desorption and gold extraction methods of gold-loaded carbon are the same as the carbon slurry method.
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