Categories | Filter Cloth |
---|---|
Brand Name: | GeZi |
Model Number: | GZ filter cloths |
Certification: | ISO9001 |
Place of Origin: | Hebei, China (Mainland) |
MOQ: | 100 Meters |
Price: | Price discussion |
Payment Terms: | L/C, T/T, Western Union, MoneyGram,Paypal |
Supply Ability: | 50000 Meters per month |
Delivery Time: | within 7-15 days |
Packaging Details: | In plastic woven bag |
Regular size: | 1.35M |
Material: | Pp |
Application: | For Centrifuge Filter |
Weaving: | Double Layer |
Product Name: | Filter Press Cloth |
Feature: | Wear resistance |
1.35M* 100m PE Double Layer Cloth For Centrifuge Filter
The principles and methods of selection. The following aspects should be considered comprehensively in the selection of filter cloths
1 The physical and chemical stability of the filter cloth material.
The appropriate filter cloth material should be selected according
to the physical and chemical properties of the slurry. The physical
and chemical properties to be considered when selecting the filter
cloth include the use temperature, tensile and deformation
properties, chemical stability, solubility or swelling properties,
and acid and alkali resistance.
2 mechanical properties. Filter cloths should be selected according
to the type of filter tensile properties, wear resistance,
elongation, elasticity and other mechanical properties. Such as
belt type vacuum filter, filter cloth walking box type filter
press, folding belt discharge drum vacuum filter and other
filtering equipment require that the filter cloth has good tensile
properties. Table 10-31 lists the domestic commonly used filter
cloth tensile properties, Table 10-32 lists the domestic commonly
used filter cloth breaking force ranking table, Table 10-33 lists
the domestic commonly used filter cloth elongation at break
sequence table . Box type filter presses and plate and frame type
filter presses require that the filter cloth have a certain degree
of elasticity and a certain degree of deformation, and the
elongation and elongation at break reflect its deformability.
Squeegee filter cake filter, frame filter press, van press filter
require a good abrasion resistance of the filter cloth. Table 10-34
lists the wear resistance of domestic commonly used filter cloths.
3 filtration accuracy. The selected filter cloth must meet the
filtration accuracy specified by the production process. The
indicators reflecting the filtration accuracy include bubbling pore
size, maximum transmission particle size, and initial filtrate
turbidity (filtrate allowable solid content). There are two
indicators for the bubbling pore size, namely the maximum bubbling
pore size and the boiling bubbling pore size. In general, the
maximum bubbling pore size is about 2 to 4 times the maximum
transmission particle. Filtration of high-concentration materials
with less stringent filtration requirements. The maximum permeation
particle size of the selected filter cloth should not be too
different from the particle size of the particles to be retained in
the material to avoid short circuits. However, for filtration with
high filtration accuracy or filtration of thin slurry without cake
formation, the maximum permeation particle size of the selected
filter cloth should not be larger than the particle size of the
particles to be retained in the material to ensure the filtration
accuracy. In addition, the uniformity of the pores of the filter
cloth is also very important. It can be described by the ratio of
the boiling bubbling pore diameter and the maximum bubbling pore
diameter. When the ratio approaches 1, the uniformity of the pores
of the filter cloth is good. Table 10-35 lists the maximum bubbling
pore size, boiling bubbling pore size, and their ratio of commonly
used filter cloths made in China. Table 10-36 lists the maximum
permeation particle diameter of domestically used filter cloths.
Table 10-37 lists them. When several representative materials are
pressure filtered, the initial filtrate turbidity of domestic
commonly used filter cloths.
4 initial filtration rate. The air permeability resistance,
permeability resistance and pressure of the filter cloth, and the
initial filtration rate of vacuum filtration all indirectly or
directly indicate the initial filtration rate of the filter cloth.
The corresponding relationship between the above three indicators,
in general, the filter cloth with large ventilation resistance, the
permeability resistance is also large, the initial filtration rate
of the filter cloth with large resistance is small, and vice versa.
For liquid-solid separation filtration equipment, filter cloth
should be selected based on water permeability or initial
filtration rate. In general, the filter cloth with a good retention
performance has a large resistance, and the filter cloth with a
poor retention performance has a low resistance. Separation of fine
particles and low-concentration materials generally select filter
cloths with good retention performance to meet the separation
precision specified in the production; for the separation of large
particles and high-concentration materials, filter cloths with
slightly lower retention performance and low resistance are
generally selected. To increase the productivity of the equipment.
Table 10-38 lists the air permeability resistance of commonly used
domestic filter cloths, Table 10-39 lists the domestic water
resistance of commonly used filter cloths, and Table 10-40 to Table
10-43 respectively list several representative materials. The
filtration rates for pressure filtration, Table 10-37 lists their
initial filtrate turbidities, and Table 10-44 lists the typical
vacuum filter initial filtration rates and filtrate clearing times
for several representative materials.
5 Cake peel performance. There is adhesion between the filter cake
and the filter cloth, and the smaller the adhesive force, the
easier it is to unload the cake. The adhesion between the filter
cloth and the filter cake is related to the material of the filter
cloth, the length of the fiber, and the weave. In general, the
monofilament fiber filter cloth has better performance than the
long multifilament fiber and the short fiber filter cloth unloading
cake. The plain woven filter cloth has the worst unloading
performance, and the satin-like filter cloth has the best unloading
performance. Table 10-28 shows the relationship between filter cake
peeling performance and yarn composition and weaving method. Table
10-45 lists the adhesive stress between domestic commonly used
filter cloth and light calcium carbonate filter cake.
6 regeneration efficiency. With the prolongation of the use time of
the filter cloth, some of the pores are blocked by the solid
particles, so that the filtration resistance increases and the
filtration rate decreases. Therefore, regeneration is required. The
regeneration performance of the filter cloth is related to the
material of the filter cloth, the length of the fiber, and the
weave. In general, monofilament filter cloths have the best
regeneration performance, filament filter cloths second, and short
fiber filter cloths the worst. Dense structure of plain weave and
canvas filter cloths have poor reproducibility, and twill and
satin-like filter cloths have good reproducibility. In fact, the
regenerated filter cloth has a period of "recovery performance
stable period", so the filtration rate normally exhibited in the
production equipment is the transition rate when the filter cloth
enters the "recovery performance stable period". Therefore, under
the premise of satisfying the filtration accuracy specified in the
production when the filter cloth is selected, the filter cloth with
good regeneration performance should also be considered.
7 sample test. The filter cloths tentatively determined by the
above methods often have many varieties. The best filter cloth can
be selected through the sample test. The sample test can determine
the filtration rate of the filter cloth, the strength of the
filtrate, the moisture content of the filter cake, the unloading
cake performance and other data. Through the comparison and
analysis of the data, the best filter cloth can be selected. Sample
tests generally use vacuum filter funnel device or pressure filter
device.
8 simulation test. After the filter cloth is selected, a simulation
test can be performed in order to verify its reliability. It is
optional to conduct a simulation test using the same small filter
or testing machine with a similar filtration process to verify the
measurement data obtained from the sample test. The filter cloth
used in the simulation test is generally applied to the production
of good performance.