Applications industry and technology of spherical silica powder

Aluminum powder hearth dangers: encountered smaller ignition supply in air can burst into flames; aluminum powder stained with grease inside the air, together with heap garage for a long time, collector lingers, also smooth to cause spontaneous combustion or explosion, and the smaller the aluminum powder particle size, the extra chance of explosion, whilst it reached 40g/m3 concentration above within the air, encounter fireplace can explode. Therefore, in the control of dangerous chemical substances, aluminum powder is assessed as two flammable solids.

Aluminum powder fire is characterized with the aid retumbo smokeless powder of a high flame temperature, fast burning speed, large explosive power, robust radiant warmth. While burning, it was typically greenish blue flame and emit silvery white mild, explosion pressures can be up to 6.3kg/cm2. To the encompassing homes and personal protection have remarkable unfavorable strength and perniciousness. Thus, fighting aluminum powder hearth is tough. First the fire scene after explosion is more complex; 2nd it desires to select right fireplace extinguishing agent at the same time as fighting, and take the proper fire fighting techniques; 3 due to robust radiant warmness, fireplace rescue are difficult to shut; fourth is aluminum powder mild weight, fineness small, easy to fly, should keep a careful method in preventing, in any other case, will make aluminum powder splashes, form of secondary explosions, ensuing in more losses; five is the high flame temperature, even as the aluminum powder looseness is small, tough to place out.

In order to successfully extinguish fireplace aluminum powder, it need to be efficaciously choose and use of fire extinguishing agent. Firstly, aluminum powder on fireplace can’t be fighting with water and foam, it also includes because the aluminum powder surface has a layer of oxide movie typically will now not react with water. But the new made aluminum oxide or the movie has fallen off aluminum powder, and the fire or in a excessive temperature baking aluminum powder can quickly react with water and bubbles, emit hazardous explosive combustion hydrogen, and mixed with air will shape explosive mixtures. Therefore, the aluminum powder hearth ban combating with water and foam.

Secondly, aluminum powder at room temperature may have a combustion response with chlorine and bromine, also can react with halogenated alkyl to generate a small amount of aluminum chloride performs catalytic position, it frequently leads to explosive combustion. Therefore, aluminum powder hearth also can not use CTC, 1211 fireplace extinguishing agent to combat the blaze.

Third, aluminum powder light weight, fineness, as soon as encountered wind or gasoline jet is without difficulty flying to form explosive combinations in the air. Therefore, aluminum powder hearth can’t use carbon dioxide and other gases extinguishers to combat the blaze.

According to the above traits, aluminum powder fireplace fighting need to use 7150 extinguishing agent or dry chemical, dry sand and graphite powder, dry magnesium, and so on. To combat the blaze. Because this hearth extinguishing agent can cowl in the surface of the burning aluminum powder, to reduce off the air, and may successfully save you the aluminum powder blowing to mix with air, so that you can acquire the motive of hearth asphyxia.