The Automatic Control of the Thickening Tank Increases the Concentration Efficiency

Update:13-07-2018
Summary:

The automatic control of the Thickening Tank increases […]

The automatic control of the Thickening Tank increases the concentration efficiency, ensures a high underflow and a desired overflow, and keeps the underflow evenly discharged. Main control of the thickening tank: the amount of flocculant added. Through the determination and calculation of feedstock concentration and feed flow rate, the ratio of solids to flocculant added in the slurry is kept constant, and a sufficient amount of flocculant is maintained in the slurry. Changing the number of revolutions of the flocculant pump can control the amount of flocculant added.

The underflow concentration and the height of the compression layer. The underflow concentration is interlocked with the rotational speed of the underflow pump, and the underflow concentration is controlled by controlling the number of revolutions of the underflow pump. When the underflow concentration is high, the number of revolutions of the pump is increased, the amount of lift is increased, and the concentration of the underflow is thickened by thickening; on the contrary, the number of revolutions of the pump is reduced, the amount of lift is correspondingly reduced, and the concentration of the underflow is thickened.

The pump speed remains the same only when the underflow concentration meets the requirements. There is a certain correspondence between the height of the compression zone interface and the number of revolutions of the underflow pump and the flow of the underflow, so the number of revolutions of the underflow pump must meet the requirements of these two parameters. The underflow pump keeps the underflow concentration constant between the upper and lower speeds. If the rotation speed is too large, the material in the compression zone of the thickening tank is easily evacuated, resulting in a decrease in the concentration of the underflow. If the rotation speed is too slow, the concentration of the underflow is increased, and the discharge is not smooth, which may cause blockage of the discharge pipe. The optimum speed of the underflow pump should control the interface of the compression zone and have the optimum height to better play the role of the sediment.