Dust generated during metal processing and production, especially dust from the processing of certain organic materials, can lead to explosive combustion accidents when the dust concentration reaches certain conditions. To prevent production accidents, research and exploration by some experts both domestically and internationally have shown that,

Let's understand the hazards of metal dust during the production process and the safety data:

Dust generated during metal processing and production, especially from the processing of certain organic materials, can lead to explosive combustion accidents when the dust concentration reaches certain conditions. To prevent production accidents, research by experts both domestically and internationally indicates that there are generally three conditions under which such industrial explosive combustion accidents occur:

1. Combustible dust is suspended in the air at an appropriate concentration, forming what is commonly referred to as a dust cloud;

2. There is sufficient air and oxidants;

3. There is an ignition source or strong vibration and friction. It is generally believed that explosive dust, as long as it meets conditions 1 and 2, indicates a potential for accidents.

Dust Explosion Limit Table

 

Type of Dust	Dust	Explosion Lower Limit g/m3	Ignition Point ℃
Metal	Molybdenum	35	645
	Antimony	420	416
	Zinc	500	680
	Zirconium	40	Room Temperature
	Silicon	160	775
	Titanium	45	460
	Iron	120	316
	Vanadium	220	500
	Silicon Iron Alloy	425	860
	Magnesium	20	520
	Magnesium-Aluminum Alloy	50	535
	Manganese	210	450
Thermosetting Plastic	Insulating Bakelite	30	460
	Epoxy Resin	20	540
	PhenolFormamide	25	500
	PhenolFurfural	25	520
Thermoplastic Plastic	CondensedAcetaldehyde	35	440
	Alkyd	155	500
	Ethyl Cellulose	20	340
	Synthetic Rubber	30	320
	Cellulose Acetate	35	420
	Tetrafluoroethylene	-	670
	Nylon	30	500
	Propionic Acid Cellulose	25	460
	Polyacrylamide	40	410
	Polyacrylonitrile	25	500
	Polyethylene	20	410
	PolyTerephthalic AcidEthyl Ester	40	500
	Polyvinyl Chloride	-	660
	Polyvinyl Acetate	40	550
	Polystyrene	20	490
	Polypropylene	20	420
	Polyvinyl Alcohol	35	520
	Methyl Cellulose	30	360
	Lignin	65	510
	Rosin	55	440
Plastic Primary Raw Material	Adipic Acid	35	550
	Casein	45	520
	Phthalic Acid	50	680
	Polyoxymethylene	40	410
	ToCarboxylBenzaldehyde	20	380
Plastic Filler	Cork	35	470
	CelluloseFlocculent	55	420
	Cotton Flocculent	50	470
	Wood Chips	40	430
Agricultural Products and Others	Corn and Starch	45	470
	Soybeans	40	560
	Wheat	60	470
	Peanut Shells	85	570
	Sugar	19	410
	Coal (Bituminous)	35	610
	Soap	45	430
	Dry Pulp Paper	60	480

 

Considerations for Purchasing Dust-Proof and Explosion-Proof Industrial Vacuum Cleaners

How to choose the appropriate model of industrial vacuum cleaner for different types of metal dust for use in your factory workshop?

After understanding some of the hazards of metal dust, the first step is to avoid them from the perspective of production safety, addressing the root cause. Industrial vacuum cleaners can also generate static electricity and electric sparks during use. Generally, conventional electric industrial vacuum cleaners have motors inside, and after long-term suction of metal dust, the dust can generate a large amount of static electricity due to friction with the machine, posing safety risks. On the other hand, the filtration precision of industrial vacuum cleaners is also very important. If the metal dust particles are too fine for the machine to filter, once they enter the vacuum cleaner's motor compartment, they can easily cause motor damage or generate electric sparks, leading to greater safety hazards. Therefore, when purchasing industrial vacuum cleaners, metal dust enterprises must buy pneumatic explosion-proof industrial vacuum cleaners.

Working Principle of Pneumatic Explosion-Proof Vacuum Cleaners:

Compressed air (usually 5.5 - 6.9 BAR) flows through the nozzle at high speed from the intake, creating a low-pressure area (vacuum) at the entrance. As a result, materials at the entrance are drawn in by the high-pressure airflow at the bottom of the barrel, while the tiny particles mixed in the airflow are filtered through the filter bag at the top of the barrel, thus helping to organize and clean the environment.

Features of the pneumatic explosion-proof industrial vacuum cleaner:

1) No power supply is needed; it uses compressed air as power, making it a substitute for electric vacuum cleaners in places where compressed air is available.

2) Equipped with anti-static hoses and accessories to prevent the generation of static sparks.

3) No moving parts, no overheating phenomenon, can work continuously for a long time, and the equipment requires minimal maintenance.

4) Large-capacity dust collection barrel, capable of vacuuming dust, water, oil stains, and powder.

5) Low noise, strong suction; can be used in conjunction with production lines or production equipment.

Dusts that are generally prone to explosion accidents include aluminum powder, zinc powder, ferrosilicon powder, magnesium powder, iron powder, grinding powder from aluminum processing, various plastic powders, intermediates of organic synthetic drugs, wheat flour, sugar, wood chips, dyes, phenolic resin ash, milk powder, tea powder, tobacco powder, coal dust, plant fiber dust, etc.