Filter cloth vacuum filtration performance detailed test steps
[A] Sample Preparation
1. Material Preparation Contractible material selection of porcelain clay, similar to the optional contractile material selection of light calcium carbonate; non-contractible materials selected diatomite, flue ash or PVC. The selected material with distilled water to prepare a mass fraction of 1.0 write the suspension. The suspension is well stirred and mixed evenly.
2. Sampling methods should be selected without defects, no de-wire, no damage and other defects of the filter cloth, remove both sides of the width of 1/10, along the width of the filter cloth evenly cut 5 diameter 125mm sample. Trim the edge of the sample with a soldering iron to ensure that the edges of the sample are uniform and not dehumidified.
3. Disposal of the sample The sample taken monolith placed in distilled water or deionized water surface, the sample can sink due to self-weight. If the sample is soaked in water, you need to soak 24h,
(B) the determination of conditions
1. Determination of temperature Determination of ambient temperature at room temperature. Each type of filter cloth samples should be measured at the same temperature.
2. Determination of water quality requirements with distilled water or ion exchange water.
3. Filter vacuum 0.06665MPa (equivalent to 500mmHg),
(C) method of operation
1. Calibration As shown in Figure 2-19, open the filter 3, place a rubber blanket with a diameter of 125mm on the part of the sample 7, tighten the bolts; open the vacuum valves 9 and 12. Start the vacuum pump 16, adjust the vacuum Conditioning valve 14, check the U-tube pressure gauge 13 mercury column can reach 0. 068MPa or more, if not, check the system's airtightness. Check the end, turn off the vacuum pump 16, vacuum valves 9 and 12; open the inlet valve 8, the system at atmospheric pressure, remove the rubber pad.
2. Operation As shown in Figure 2-19, first apply a layer of sealant on the edge of the filter cloth, and then place the specimen in position 7 of the filter 3, tighten the bolts, the seal is indeed missing; The slurry into the feed chute 6; open the feed valve 5, into the flow bucket 4 into the slurry, and stirring paddle constantly in operation; conditioning feed valve 5, Close the vacuum valve 9, the drain valve 2, the intake valve 8 and the intake valve 14; start the vacuum pump 16, open the vacuum regulator valve 12, conditioning the intake valve 14, the U-shaped differential pressure gauge 13 reading slightly larger than 0.068 MPa; quickly open the vacuum valve 9, conditioning the vacuum control valve 14, so that the degree of vacuum at 0. 06665MPa (equivalent to 500mmHg) stop pumping; when the filtrate into the metering bottle 11 start timing, 10. Detect the turbidity of the filtrate and record the clearing time. When the filtrate in the metering bottle 11 reaches 500 mL, close the vacuum valve 9 and the vacuum pump 16 and record the time taken to collect SOO mL.
4. Explain that during the measurement, only the sample should be clamped with the tweezers to move the edge of the sample. It is not allowed to touch the surface of the sample under test. Nor should the sample be crimped or wrinkled. Otherwise, the sample should be re-sampled.
Ordinary vacuum filter commonly used in the vacuum degree of 0.0533MPa-0.0800MPa (400mmHg -600mmHg) range, T test conditions as close to the practical application of state, the side of the vacuum set. . 06665MPa (about 500mmHg)
The maximum test area of the filter cloth is 6. 36 X 10 -'n2. If the filtration speed of the filter cloth is faster, the other supporting installation (such as the volume of the measuring bottle, etc.) can not be matched, the pressure ring on the filter cloth can be reduced Hole diameter to reduce test area.
浙江天台丰顿滤料有限公司是一家专业从事：液体过滤袋、工业滤布、滤布、滤袋、除尘袋生产销售的滤布厂家，多年来在液体过滤袋、滤袋、工业滤布、除尘袋生产上积累了丰富的经验和领先的技术。
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