Calculate the choice of main equipment in the cyanide plant

The main equipment selection for the cyanide plant is calculated as follows:
1. Leaching trough At present, the main use of single impeller mechanical stirring tank, double impeller hollow shaft air outlet stirring tank, axial flow mechanical stirring tank and air stirring tank. The calculation of the volume of the leaching tank is as shown in the formula (the following formula).

Where V is the volume of the required leaching tank, m 3 ;
Q——Daily processing ore, tons/day;
t - the required leaching time, hours;
Δ——ore density, t/ m3 ;
R——leaching slurry ratio;
K——The utilization factor of the volume of the leaching tank is generally 0.8 to 0.95.
The calculation formula of the required volume of the carbon adsorption tank is the same as the formula (the above formula). At present, the adsorption tanks commonly used in China have air-mechanical stirring tanks and double impeller hollow shaft air intake mechanical stirring tanks.
2. Washing and concentrating machine Domestic single-layer concentrating machine (both sub-center transmission and peripheral transmission type) and three-layer central transmission concentrator are generally used in China. The calculation formula of the sedimentation area of ​​the thickener is:

Where F is the required sinker area of ​​the concentrator, m 2 ;
Q——the amount of solids fed into the thickener, t/m;
q——The unit production capacity of the concentrator, t/m 2 • day.
The calculation formula of the filter is the same as the formula (the above formula), except that the symbol in the formula refers to the filter. The washing filter often uses an internal filter type cylindrical filter, an external filter type cylindrical filter, a disc filter, a belt filter, and the like.
3. Replacement tanks Horizontal displacement tanks are commonly used in production. The equipment has no fixed specifications and can be designed according to international conditions. The calculation formula of the effective volume of the replacement tank is:
V=V 1 Kt
Where S is the cross-sectional area of ​​the deoxidation tower, m 2 ;
W——the amount of solution to be deoxidized, rice soup/day;
q——The amount of solution on the unit cross-sectional area, m 3 / m 2 days.
5. Desorption column The domestic common desorption column is a cylinder. The carbon bed height to diameter ratio is 4-6:1, and the desorption liquid flow rate is generally less than 3.4 mm/sec. The desorption column is calculated accordingly. Since the desorption column has no fixed specifications, it can be designed according to actual needs. The calculation method is:
The carbon bed volume V 1 is determined based on the known amount of gold- loaded carbon and the carbon density, and the diameter and height are determined by the ratio of the height to the diameter. The expansion ratio of the carbon bed layer was 5%. The volume V 2 of the expanded carbon bed can be determined, and then the height of the expanded carbon bed can be determined. By leaving the distance between the screen and the cone bottom, the total height of the desorption column can be determined. This will determine the relevant parameters of the desired desorption column.
6. Electrolytic tanks Electrolytic tanks are often made into rectangular shapes. Currently, there are no fixed specifications, which can be designed according to actual needs. The amount of precious liquid and the electrolysis time are the main parameters of the design.

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