Filter Bags in Lime Crushing/Screening Dust Collection

A Guide to Choosing the Right Filter Media

Lime crushing and screening operations generate significant amounts of dust and particulate matter, which can pose health and safety hazards to workers and nearby communities. As a result, it is essential to have effective dust collection systems in place to capture and remove these airborne contaminants. One critical component of any dust collection system is the filter bags used to capture and contain the dust. This article will provide a guide to choosing the right filter media for dust collection in lime crushing and screening operations.

The Importance of Proper Dust Collection

Lime crushing and screening operations can produce a variety of dust and particulate matter, including fine particles that can become airborne and pose health and safety hazards. Inhalation of these particles can cause respiratory problems, lung damage, and other health issues. Proper dust collection is essential in mitigating these risks and ensuring a safe and healthy working environment.

Factors to Consider When Choosing Filter Bags

When choosing filter bags for lime crushing and screening dust collection, several factors need to be considered, including:

1. Particle Size: Lime crushing and screening operations generate particles of varying sizes, and filter bags must be chosen based on the size of the particles. In general, a fabric with a smaller micron rating is more effective at capturing smaller particles.

2.Temperature: The temperature of the gases and dust being filtered is another crucial factor to consider. If the temperature exceeds the filter media’s melting point, the filter bag will degrade and become less effective.

3.Chemical Composition: Lime crushing and screening operations can produce dust with varying chemical compositions, such as sulfur dioxide, which can be corrosive. In such cases, filter bags made of a material resistant to these chemicals are necessary.

4.Abrasion Resistance: The constant flow of dust and particulates can cause wear and tear on filter bags, reducing their effectiveness. Choosing a durable filter media with high abrasion resistance can extend the lifespan of the filter bags.

5. Air-to-Cloth Ratio: The air-to-cloth ratio is the ratio of the volume of air being filtered to the surface area of the filter media. This ratio can impact the effectiveness of the filter bags, with a higher ratio leading to lower efficiency.

There are several common filter media options for dust collection in lime crushing and screening operations, including:

Polyester Felt: Polyester felt is a synthetic material with excellent abrasion resistance and high filtration efficiency. It is also resistant to moisture and mildew and can withstand high temperatures up to 275°F.

Polypropylene Felt: Polypropylene felt is another synthetic material with excellent chemical resistance and a high melting point of 330°F. It is an ideal option for filtering acidic and caustic gases.

PTFE Membrane: PTFE membrane is a highly effective filter media with excellent chemical resistance and high-temperature tolerance up to 550°F. It is ideal for filtering fine particles, including lime dust.

Fiberglass: Fiberglass filter bags are highly durable and have excellent chemical resistance. They are also capable of withstanding high temperatures up to 500°F and are ideal for high-temperature applications.

TypesOperating Temperature ℃/℉Instant Temperature℃/℉Abrasive Resistance Hydrolytic StabilityAcid Resistance AlkaliAlkali ResistanceOxidation Resistance
Polypropylene80/176100/212ExcellentGoodExcellentExcellentRestricted
Homopolymer Acrylic140/284160/320GoodModerateExcellentExcellentGood
Polyester130/266150/302ExcellentModerateModerateModerateGood
PPS190/374220/428ExcellentModerateExcellentModerateModerate
Nomex204/399240/464ExcellentGoodGoodGoodModerate
P84260/500280/536ExcellentModerateExcellentModerateGood
PTFE250/482300/572GoodExcellentExcellentExcellentExcellent
Fiberglass240/464280/536GoodModerateGoodGoodRestricted
FMS240/464280/536GoodModerateGoodGoodRestricted

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