The comprehensive utilization condition of powdered coal dust is introduced, and the effect is that the pollution of the environment is reduced.
介绍了对粉煤灰的综合利用情况，减少了粉煤灰对环境的污染，收到了良好效果。
If air is used as a carrier for transporting the powdered substances (such as the coal dust, the metal mineral powder and the flour), explosions are easy to cause.
若以空气为载体运送粉状物质(如煤粉、金属矿粉、面粉)，容易导致爆炸。
The natural curing powdered coal-dust brick and its manufacturing method belong to building materials manufactured by use of industrial waste materials.
自然养护粉煤灰砖及其制造方法属于利用工业废料制造建筑用材料。
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