Comparison of aerated dry aluminum powder and aerated aluminum powder paste in aerated concrete

   Date:2020-03-10     Browse:13    
Core tips:The processing technology of hydrophilic aerated dry aluminum powder is imported from abroad. After more than 10 ye
The processing technology of hydrophilic aerated dry aluminum powder is imported from abroad. After more than 10 years of improvement, the technology has gradually matured. In recent years, there has been a new gas-generating material, hydrophilic aluminum powder paste.
Although it has this advantage to avoid dust flying, some manufacturers believe that it has good safety in the production of aerated concrete, so they use aluminum powder paste for production, but the use of aluminum powder paste also brings other problems. His stability is much worse than aluminum powder, which cannot be stored for a long time. Poor dispersibility, uneven particle size distribution, the aerated block produced have uneven bubbles, easy cracking, and low strength. There is a large difference in solid content, and the ingredients are not. Accurate, resulting in different gas generation heights and large differences in strength; due to the poor fluidity of aluminum paste, it is easy to remain in the aluminum powder mixing tank, leading to unstable feeding and affecting gas generation; the production of aluminum powder paste requires a large amount of chemical In the current severe environmental protection situation, pharmaceuticals and water, using waste aluminum foil materials, cannot meet environmental protection requirements. Some small-scale aluminum powder manufacturers have been banned by the government. Dry production of aluminum powder has high active aluminum content and uniform particle size distribution. The raw materials are national standard aluminum ingots, and the quality control is stable. Therefore, the aluminum powder produced by dry method can ensure stable quality while the particles are relatively uniform, and the fluidity is good. Suitable for large production.
Generally, the volume expansion of the slurry is required to be 1 time or more during the gas expansion phase of the slurry. Therefore, the need for aerated aluminum powder can provide a large amount of gas that is insoluble and hardly soluble in water. These gases can form spherical bubbles of appropriate size and uniform size in the slurry, and can maintain stability without deformation and rupture. In addition to the slurry itself must have a certain temperature, consistency and other conditions, an appropriate bubble stabilizer (stabilizing foam) Agent) is very important. We call the material that provides the gas the gas generating agent, and the material that stabilizes the bubble is the foam stabilizer, which is also an important role of aluminum powder in production.
 
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