Three in one filter washing and drying machine

The three-in-one process of filtration, washing and drying is to complete the process of stirring, reaction, filtration, cleaning, deliquoring, drying (and secondary beating) in a closed container. It is widely used in pharmaceutical, chemical, food, dyestuff and other industries, and is especially suitable for production occasions with high cleanliness requirements, small batches, multiple product types and extra large batches.

Filtering, washing and drying three-in-one process


1. Filtration

The solid-liquid mixture crystal slurry produced by the upstream reaction kettle or crystallization equipment is discharged into the tank body of the three-in-one equipment, and the pressure difference is used as the driving force to realize the filtration and separation of the solid-liquid mixture. Practical applications include pressurized pressure filtration, vacuum suction filtration and combined pressure and vacuum filtration. Pressurized filter presses use clean compressed air, nitrogen or other inert gases. The compressed gas should be selected according to the characteristics of the solid-liquid mixture. For example, if the solid-liquid mixture is easily oxidized or there is an explosive medium in the solid-liquid mixture, compressed air cannot be used, and an inert gas should be used. According to actual experience, the filtration pressure of general products in the pharmaceutical industry can be achieved from 0.2 to 0.3 MPa. Some products in the chemical or food industry require higher filtration pressures, and some pressures reach 1.0 MPa.

2. Washing

After the filtration process is completed, the next process operation, washing, is required. The three-in-one equipment tank is equipped with a special spray device, which can evenly distribute the cleaning (washing) liquid in the tank. By turning on the stirring system, stirring lifting mechanism, and transmission mechanism, the blades can be rotated and moved up and down axially , So that the materials are fully washed, and the impurities adhering to the surface of the crystal grain are washed clean. The washing liquid and washing times used for washing should be determined according to the materials and production process characteristics.

3. Dry

The drying process of the three-in-one equipment can use hot air drying or vacuum drying. When using hot air drying or vacuum drying, clean inert gas must be used, because dust will be generated during the drying process, and the operating environment of the equipment must be considered to be explosion-proof. At present, the mainstream drying process of three-in-one equipment is vacuum drying. The factors that affect the vacuum drying process are mainly the degree of vacuum, drying time, characteristics of the stirring blade and so on.

The vacuum drying process uses a vacuum system to remove the inert gas in the tank to reduce the number of gas molecules and isolate the air. It is mainly suitable for materials that are easily oxidized and deteriorated, as well as for evaporation of materials that need to be recovered and heat-sensitive materials. Under vacuum, it can reduce the chance of material contamination, or inhibit the growth of certain bacteria, so it is particularly suitable for drying sterile materials.

Flat filter washing and drying three in one performance characteristics

1. System sealing: The three-in-one filter, washing and drying is a fully enclosed system. In the production operation of the enclosed system, it can avoid the pollution of air by toxic substances and reduce the occurrence of poisoning accidents by the operators.

2. Recycling: materials and solvents are almost completely recovered to avoid waste caused by missing materials and solvent volatilization, which has great economic benefits.

3. Multi-function operation: filtering, washing and drying are completed in the same equipment. The wall of the container is equipped with a heating jacket so that it can be dried.

4. Continuous operation: Filtration and drying are carried out in a continuous system without processing wet filter cake. The dried product can be mechanically transferred to weighing, packaging and other sections.

5. Save manpower: a non-technical person with simple training can complete the operation. Technical personnel are not required to monitor the opening, closing, automatic feeding and automatic discharging.

6. Thorough cleaning: the three-in-one filter washing and drying has the functions of automatic spraying and stirring, and the filter cake can be fully cleaned, thereby reducing the amount of sewage and the cost of wastewater treatment.

7. Clean production: The multi-function filtration and drying system is equipped with a dust collector to collect the dust generated after drying, which can meet the requirements of clean production.