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Russian Application of Filter Press in Magnesium Sulfate Dehydration
In the magnesium sulfate dehydration process, the filter press plays a vital role. It is mainly used to effectively separate magnesium sulfate crystals from mother liquor, thereby improving product purity, reducing energy consumption, and optimizing subsequent drying steps. The following is an analysis of the specific application of the filter press in the magnesium sulfate dehydration process.
Demand for Magnesium Sulfate Dehydration
Magnesium sulfate is widely used in agriculture (such as Epsom salt and fertilizer), the chemical industry, medicine, and other fields. In its preparation process, the crystallization method is often used to obtain magnesium sulfate heptahydrate or other hydrates. The crystallized product needs to be dehydrated to obtain a solid product with a lower water content, and the filter press is one of the key equipment in this step.
The Core Role of Filter Press in Magnesium Sulfate Dehydration
High solid-liquid separation efficiency
The filter press can separate the free water and part of the bound water in the crystallized magnesium sulfate under high pressure to form a filter cake, effectively reducing the moisture content. Compared with traditional sedimentation or centrifugal equipment, filter press dehydration is more thorough and consumes less energy.
Strong equipment adaptability
Various types of filter presses, such as plate and frame filter presses and membrane filter presses, can adapt to magnesium sulfate with different crystal forms. In particular, membrane filter presses can further compress the filter cake through membrane plate extrusion after completing the initial filtration, thereby improving the dehydration effect.
The filtrate can be recycled
The removed filtrate still contains some soluble magnesium sulfate, which can be returned to the crystallization process for recycling, improving resource utilization and reducing emissions.
Operation Precautions
- Temperature control: Properly controlling the slurry temperature before filtration can help reduce the viscosity of the mother liquor and improve filtration efficiency.
- Adding flocculants during pretreatment: Adding appropriate amounts of flocculants such as polyaluminium chloride and polyacrylamide can improve the morphology of crystal particles and enhance the filter press effect.
- Filter cloth selection: Choose corrosion-resistant and heat-resistant polypropylene filter cloth to prevent corrosion of equipment due to magnesium sulfate and extend service life.
- Cycle management: Reasonably set the filtration cycle and washing time to avoid overpressure or overload operation and reduce the equipment failure rate.
Conclusion
The filter press reduces the energy consumption of the dryer through efficient dehydration, effectively removes residual liquid, and reduces impurities; the filtrate after filtration is reused to reduce wastewater discharge and promote clean production. It is ideal equipment for magnesium sulfate dehydration.
