Classification And Characteristics Of Vacuum Filter

- Apr 11, 2020-

Intermittent vacuum filter

The mechanism of the vacuum filter and the pressure filter is basically the same, except that the pressure on one side of the filter medium is lower than atmospheric pressure, and the driving force is small. Vacuum suction filter: The structure is simple, and the filtering driving force is greater than that of the gravity filter. Vacuum leaf filter: simple structure, suitable for the filtration of ordinary mud-like materials, but the operating conditions are poor, and the labor intensity is high.

Continuous vacuum filter

External filter surface drum vacuum filter: can be operated continuously and automatically, can effectively filter, wash, dehydrate, clean the operation site, easy to check and repair. The disadvantage is that the cost is high, the scope of use is limited by the vapor pressure of the hot liquid or volatile liquid, the material with a low boiling point or volatile at the operating temperature cannot be filtered, and it is difficult to handle the slurry with large solid content and large changes in particle characteristics, and the filter cake Moisture content is about 30%, rarely less than 10%, mainly used in chemical and food industries.

Drum vacuum filter with inner filter surface

It is suitable for filtering suspensions with uneven thickness of solid particles. It does not require a stirring device. The machine has low cost and can adapt to changes in feed concentration. If it needs to operate at high temperature, it is easy to take heat preservation measures. The disadvantage is that the surface of the drum cannot be fully utilized, and the filter cake needs a certain viscosity, otherwise it will easily fall off, resulting in a decrease in vacuum and a change in the feed flow rate; it is difficult to replace the filter cloth.

Disc vacuum filter

According to the unit filtering surface, the price is the lowest and the floor space is small, but the filter cake humidity is higher than the rotary drum vacuum filter. Because the filtering surface is vertical, the thickness of the filter cake is uneven, easy to crack, not easy to wash, the thin layer filter cake is difficult to discharge, the filter cloth wears fast, and it is easy to block. It is easy to handle materials with low sedimentation speed and easy to filter, and is not suitable for processing non-sticky materials. The application range is the same as that of rotary drum vacuum filter.

Turntable vacuum filter

The structure is simple, the washing effect is good, and the washing liquid is separated from the filtrate. For the slurry that dehydrates quickly, the processing capacity of a single filter is large. The disadvantage is that it covers a large area, the filter cloth wears quickly, and it is easy to block.

Turn-over vacuum filter

It can filter viscous materials and has strong adaptability. It is suitable for separating slurry with solid content of greater than 20% and high density, and it is easy to separate and the filter cake must be fully washed. It is often used in chemical industry, light industry and other industries.

Maintenance of turn-over vacuum filter;

1. The installation precision control of rotating parts is difficult and the deviation process is slow;

2. The fatigue damage of the filter steel structure is slow;

3. The acidic medium has a slow corrosion effect on parts;

Belt vacuum filter: divided into fixed chamber type, mobile chamber type, and three types when the filter belt moves intermittently. The belt vacuum filter is a horizontal filter surface, which is fed with upper material, high filtration efficiency, good washing effect, and adjustable filter cake thickness. The filter cloth can be washed on both sides, flexible operation and low maintenance cost. It can be used in the chemical, pharmaceutical, and food industries. It has excellent separation performance for the slurry with a faster settling speed, and it is better when the filter cake needs to be washed.