Selection
of dust filter bag in ceramic industry: water
and oil repellent and anti-static filter bags are
widely used in the field of dust removal in ceramic industry. The process of
ceramic production is divided into raw material process, molding process, and
firing process, color roasting process.
Ceramics industry
from the past workshops to today's production line production, although the
degree of mechanical automation and production processes have been
significantly improved, but the production process still has a large number of
dust and gas pollutants. The process of ceramic production is divided into raw
material process (batching, ball milling, pulping, iron removal, screening,
spray pulverizing), molding process (molding, drying, trimming), and firing
process (plain burning, finishing, glazing, glaze), color roasting process
(fine addition of applique, inlaid gold and barbecue).
A large amount of
dust will be produced in the process of raw material extraction, processing and
transportation. In the process of spray pulverizing and firing, gas combustion
should be used to complete the process. In addition to a large amount of dust
particles, such as SO2, NOx, CO and other acidic substances, as well as heavy
metal ions such as lead, mercury and chromium, the environment is seriously
polluted.
Bag
type dust collector is an important means to control the
flue gas of the ceramic factory. The bag type dust collector is simple in
structure, stable in operation and flexible in use. It can be set directly in
the room, near the machine tool, used for the dust removal in the workshop, and
can also be used as a large dust removal equipment in the outdoor treatment of
industrial tail gas. Moreover, the initial investment of bag
filter is relatively small, and it is economical choice.
In addition to the
selection of bag filter, the selection
of the filter bag is also very important. The selection of the
filter bag is not suitable to shorten the life of the filter bag. The frequent
replacement of filter bag not only causes pressure in the economy, but also causes
the effect of production.
The flue gas of
ceramic industry is often high in temperature and contains a large number of
acid compounds such as SO2 and NOx. Therefore, when selecting the dust
filter bag of the ceramic factory, the high
temperature resistant filter bag, such as PPS and PTFE, should
be selected. Different ceramics need to be made by different craft. In the
industry of ceramic wall and floor tile, the moisture content of the industry
is high, the filter material that the dust can't enter and the air permeability
will not be reduced shall be used, for example, calendered or membrane
filter bag is not only easy to dust removal, but also excellent
hydrophobicity reduces the phenomenon of paste filter bags. Or spray the powder
on the surface of the filter bag in advance, so that the filter gas can not
directly touch with the filter bag. It is easy to mix inflammable substances in
burning smoke and dust, so it is necessary to increase antistatic treatment for
filter materials. Therefore, water
and oil repellent and anti-static filter bags are widely used
in the field of dust removal in ceramic industry.
In the absence of
high temperature flue gas, such as mining and transportation, polyester or
acrylic filters at room temperature are more economical choices.
The ceramic industry
has a wide variety, complex process and different management precision, so the
exhaust gas composition is not fixed, the selection of filter material can not
be generalized. The specific selection of filter bag material needs to be
combined with the actual situation, the customer's budget and the operating
cost to take the comprehensive consideration.
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