If the salt particles are significantly smaller than the iron particles, however, the salt might fill spaces between the iron particles, at least in the upper iron layers. Using the special properties of each material also suggests solutions. If separation is the goal, without concern for the condition of the materials, then the sawdust could be burned away, leaving the salt and iron, which allows the salt to be dissolved in water, leaving the iron.
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Alternately, the iron could be removed using a magnet, then water added to the wood and salt mixture. The salt dissolves, and the wood floats, leaving any remaining iron to sink.
If the challenge requires capturing all three materials, however, burning the wood must be eliminated as a solution. Based on the presumption that all three materials must be reclaimed without damage, using the special properties seems most practical. Therefore, using density differences, water and a magnet seems the most efficient solution. If the materials must be reclaimed and undamaged, start by using a magnet to capture and isolate the iron.
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Spread the mixture in a pan and draw the magnet through the material, capturing and separating the iron from the salt and sawdust. Repeat until the magnet doesn't capture any more iron. If the iron is too hard to remove from the magnet, drag the magnet across the bottom of the container, moving the iron to one side without directly touching the iron with the magnet. Place the remaining mixture in a container large enough to hold the materials and with room to add water. Add water to cover the mixture, then stir gently.
Be sure to stir all the way to the bottom of the container. As stirring continues, any remaining iron will settle to the bottom of the container. The salt will dissolve in the water, and the sawdust will float. Carefully skim off the sawdust and set it aside to dry. Alternately, use a sieve or filter paper to capture the sawdust. Pour the water into a shallow pan. Let the water evaporate naturally or heat gently to accelerate the evaporation process.
The salt is left behind. Note: If any iron remains in the jar, be sure the iron dries completely before adding it to the previously separated iron. Any remaining water might cause the iron to rust. For those who like to step beyond the challenge, the mass of the materials could be measured to check the methodology.
Prior to separating the mixture, measure the mass of the total mixture. Machining and manufacturing. When dust is exposed to enough heat or even a spark, it can ignite. When airborne dust is near a fire, it often results in an explosion. Poor work procedures can stir dust into the air, and something as simple as a spark from welding or a hot machine motor or bearing, for instance, is all it takes to trigger an explosion. In order for an explosion to occur, the following five factors need to be present: fuel, dispersion making the dust airborne , oxygen, ignition, and confinement.
When all five factors are present, it can result in an explosion. When a combustible dust explosion occurs, it is often followed by one or more subsequent explosions. The first explosion stirs up dust that has settled on surrounding surfaces and forms a dust cloud. The dust cloud can fuel a second explosion, which typically starts almost immediately after the first.
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Unless you have been properly trained, do not attempt to fight a combustible dust fire. If you do so improperly, you could disturb accumulated combustible dust. This could trigger an explosion or a fireball. Instead, sound the alarm, alert designated responders, and follow evacuation procedures. Dust control is the single most important factor in preventing fires or explosions in any dust-generating workplace. Effective dust control can reduce the risk of a catastrophic fire or explosion in the workplace.
The most effective way to reduce the risk associated with combustible dust is to eliminate its source. If that's not possible, you can use other risk controls.
Eliminate the hazard by substituting a safer process or material where possible, which is the most effective control. Some questions to consider:. Make physical modifications to facilities, equipment, and processes to reduce exposure. Change your work practices and policies and provide awareness tools and training to limit the risk of combustible dust. However, where dust is produced you may also have other hazards to assess.
the sawdust has settled.
See our combustible wood dust toolbox for information, training tools, and templates you can use to develop your own policies and practices to deal with combustible dust hazards in your workplace. WorkSafeBC Home. Need coverage? Manage your account Get a clearance letter Know how much coverage costs Apply for coverage. About Us. Contact Us.