The two-stage dewatering process configuration of the flotation plant is the configuration of the filtration system.

In addition to thickeners and filters, the two-stage dewatering process requires a lot of auxiliary equipment. The dehydration process is: obtaining the concentrate from the flotation machine 1, first entering the thickener 2 for the first stage of dehydration, and the slurry concentrated by the thickener is directly sent to the vacuum filter 4 by the sand pump 3. The vacuum pump ll is connected to the filter through the filtrate tube 6. There is a steam separator 12 between the filtrate barrel and the vacuum pump. The bottom of the steam separator has a gas pressure pipe of up to 10.5 meters, and the lower end is immersed in the water pool. When filtering, the filtrate enters the filtrate barrel by vacuum suction, and the filtrate enters the steam separator from the filter tube. At this time, the moisture contained in the air is separated and flows down the pressure tube, and the air is extracted by the vacuum pump. A safety valve is installed in the upper part of the filtrate barrel to prevent the filtrate barrel from being filled with water, and the water is prevented from being sucked by a dry vacuum pump (sheet vacuum pump). The function of the air tube is to enable the water in the steam separator to flow automatically without being affected by the vacuum suction, ensuring that the water does not enter the vacuum pump to prevent damage to the vacuum pump.

There are roughly three options for the configuration of the filtration system. In Fig. 9-8(a), the filtrate and air are first pumped out of the steam separator by the real word pump, the air is taken away from the upper part, and the filtrate automatically flows into the pool from the lower part. Oka for the steam separator is a negative pressure. In order to prevent the filtrate from entering the vacuum pump and automatically discharging it, the drop between the bottom of the steam separator and the pool is not less than 9 to 10 meters. The biggest disadvantage of this configuration is that the filter should be installed at a higher position. The advantage is that the filtrate can be automatically discharged without consuming power. The configuration of the filtration system of Figure 9-7 falls into this form. In Fig. 9-8(b), the filtrate entering the steam separator is forcibly extracted by a centrifugal pump. The advantage is that the filter can be installed at a lower position, and the disadvantage is that a dedicated centrifugal pump is required, which consumes power. Figure 9-8(c) replaces the steam separator and centrifugal pump with an automatic drain. The filtration system filtrate can be automatically discharged without the need to install the filter in a higher position.

The discharged filtrate contains a certain amount of solids and cannot be discarded. It should be returned to the thickener. In order to ensure the stability of the filter, the filter has a part of overflow and also returns to the thickener.

The plant generally uses two types of water ring vacuum pumps (wet) and reciprocating vacuum pumps (dry). The water ring vacuum pump allows the filtrate to enter the pump for short-term operation. It can also be used as a pressure fan. When the capacity of the vacuum pump is sufficient, the pressure tube is often connected to the exhaust valve, and the air discharged from the vacuum pump is used to blow off the filter cake of the filter, which can save equipment investment, but also And reduce the thermal efficiency of the vacuum pump. The maintenance of the water ring vacuum pump is relatively simple, but its power consumption is large. The reciprocating vacuum pump is a dry pump, so the filtrate is not allowed to enter the pump. The maintenance requirements are more elaborate, but the power consumption is less, and a higher vacuum can be obtained. Currently beneficiation plant water ring vacuum pump is used more.

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