Percolation leaching equipment
The main equipment for percolation leaching is the percolation leaching tank (Fig. 1). The leaching tank usually has a false bottom, and the bottom of the groove is slightly inclined (about 0.3%). The shape of the groove is cylindrical, rectangular or square. The structure can be wood, concrete or low carbon steel. The size of the tank used in small mines is about 5~12m, the height is 1.5~2.5m, and the ore is 75~150t per batch; the smaller scale percolation tank is 15~30t per batch. The large-scale percolation leaching tanks in foreign countries have a diameter of more than 17m and a height of 3m. Each batch can be processed for more than 1000t.
Figure 1 Percolation leaching tank
1-tank; 2-cement lining; 3-mineral layer; 4-false bottom; 5-outlet
The false bottom is about 100 to 200 mm from the bottom of the groove. A false bottom structural lumber commonly strips of the grid plate, and laid on a grid canvas, filtered off and easy both to prevent sand filtration layer containing gold in a solution or a mat permeable sack or the like. The leachate flows out through the outlet tube. Some percolation leaching tanks are overhead and have working doors in the center of the bottom of the tank for unloading tailings.
In addition, there are sand pumps for conveying pulp, mining machinery and machinery for discharging tailings.
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