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The filtration is a mechanical separation of solids from a liquid. It is carried out to obtain the recovery of the clarified liquid or of the solid and sometimes both.
The filtration is obtained by pressure on a permeable support operating as "filter means", allowing the liquid to flow and keeping the solid from the cloth.
The Vacuum rotary filter is a continuous filter in which we can distinguish as (1) an immersion phase (2) with panel formation on the filter, a paneldrying phase (3) with or without washing phase and (4) a panel discharge phase.
Choice of the type of filter
The choice of the most suitable type of filter depends on a number of factors:
- type of solid to be filtered (colloidal, crystalline, etc.)
- solid granulometry
- solid precentage
The filters can be manufactured in accordance with customer requirements and also in the following materials:
- carbon steel
- carbon steel with ebonite lining
- stainless steel
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| Product to be filtered | Suspended solids % | Production filtrate lt/h m2 | Production dry kg/h m2 | Cake thickness mm. | Residual humidity % |
| Industrial slurries | 4-10 | 200-400 | 15-60 | 3-12 | 50-75 |
| Chemical and pharmaceutical products | 2-10 | 400-1000 | 20-100 | 5-30 | 40-60 |
| Slurries from foodstuffs production | 2-5 | 150-300 | 8-15 | 3-5 | 65-75 |
| Industrial slurries | 0.5-2 | 150-450 | - | - | 60-70 |
| Biological slurries | 0.5-2 | 120-350 | - | - | 70-80 |
| Chemical and pharmaceutical products | 0.5-2 | 200-800 | - | - | Variabile |
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