Selection of dust filter bag in ceramic industry
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.
