The main equipment of the adsorption circuit of the carbon p
2020-09-16 09:12Introduction：The main equipment of the adsorption circuit of the carbon propeller- slot screen The function of the slot screen is to separate the pulp from the activated carbon and realize the reverse flow of the slurryand activated carbon. At the begi
The main equipment of the adsorption circuit of the carbon propeller- slot screen
The function of the slot screen is to separate the pulp from the activated carbon and realize the reverse flow of the slurryand activated carbon.
At the beginning of the CIL plant, the shaker screen was mainly used as the slot screen. For example, the stainless steel square hole vibrating screen is used as the slot screen in the Homs Teke separation plant put into production in 1973. Because of the continuous pumping of the carbonized slurry and the vibration of the screen surface, the carbon wear is quite serious and the production cost is high. In order to reduce the wear of carbon, reduce the cost, increase the recovery rate of gold and facilitate the operation and maintenance, a variety of fixed sieves have been developed in the past decade to be used as interslot sieves for the CIL process, including peripheral sieves, bridge sieves and immersion sieves, etc.
2. Bridge screen: it is a vertical fixed screen. One or more fluxes are arranged on the upper part of the adsorption tank arranged in a step, and a sieve mesh is installed on one side or both sides of the flow trough, which is placed horizontally in the adsorption tank and immersed under the slurry surface. The maximum length of the screen is about four times the diameter of the adsorption tank. A sieve is often made up of multiple removable sieve plates for easy replacement and maintenance. Both the flow trough and the sieve pass through the wall of the adsorption tank. In operation, activated carbon with slurry is regularly promoted from the next adsorption tank to the first one, the slurry flows through the sieve net to the next tank, and the activated carbon remains in the previous adsorption tank, thus realizing the reverse flow of slurry and activated carbon. Bridge screen is a vertical fixed screen for air cleaning. When the adsorption tanks are arranged in a single row, the bridge screens are arranged in a straight line (Fig. 5-33). When the adsorption tanks are in double row configuration, the bridge screens are arranged at right angles (Fig. 5-34). It is easy to operate, less investment, easier to maintain and lower production cost. The air cleaning cost of five bridge sieves is only equivalent to that of one vibrating screen.
3. Immersion screen: also known as balanced pressure air cleaning screen (Fig. 5-35). It can prevent screen clogging and reduce the wear of activated carbon. It is expected to be widely used in propeller plant. In operation, the slurry pressure on both sides of the screen is balanced, the adsorption tank can be arranged on the same horizontal plane, and the sieve surface does not need to be cleaned with compressed air, and the investment is less.
In addition, a vibrating screen with high frequency and low amplitude wedge-shaped wire mesh has been developed. The test results are satisfactory, and the processing capacity can be increased by more than three times than that of the air cleaning screen.
