Selection of main equipment for cyanide plant

The main equipment selection for the cyanide plant is calculated as follows:

Leaching tank

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 treated ore, ton / day; t - required leaching time, hour; δ - ore density, ton / m 3; - Leaching slurry solid ratio; K - Leaching tank volume utilization factor, generally taking 0.8 ~ 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 concentrators (both sub-center transmission and peripheral transmission) and three-layer central transmission concentrators are generally used in China. The calculation formula of the sedimentation area of ​​the thickener is: where F is the required sedimentation area of ​​the thickener, m 2; Q - the amount of solids fed into the thickener, t/m; q - the unit production capacity of the thickener, t/m2•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 slot

Horizontal replacement 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=V1Kt where S is the cross-sectional area of ​​the deoxidation tower, m 2; W——to be deoxidized The amount of solution, rice soup / day; q - the amount of solution on the unit cross-sectional area, m 3 / m 2 days.

4. Desorption column

The common desorption column in China 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 specification, it can be designed according to actual needs. The calculation method is as follows: Calculate the volume V1 of the carbon bed according to the known amount of gold and carbon density, and then calculate the diameter and height according to the ratio of height to diameter. The expansion ratio of the carbon bed layer was 5%. The volume V2 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.

5. Electric accumulator

The electric accumulator is often made into a rectangular shape. Currently, it has no fixed specifications and 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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