Alkali concentration
Alkali concentration The higher the alkali concentration in the slurry, the faster the aluminum powder reacts, The aluminum powder in the sodium carbonate solution release gas faster than in the lime solution. When sodium hydroxide is added to the solution, the reaction rate of the aluminum powder will be greatly accelerated. Therefore, some plants often reserve some sodium hydroxide solution to adjust the gas velocity.
lime
In in the slurry that lime as the main calcium material , lime digestion generated Ca (OH) 2, so the amount of lime A-CaO content and digestion temperature direct impact on the speed of gas release. Therefore, when lime as the calcium material, usually not adding lye. Cement varieties
Cement hydration speed and hydration heat affect the aluminum powder gas release, if the cement contains more chromate, it will make the f aluminum powder surface oxidate, so that the reaction becomes dull. In this case, you can use a small amount of ferrous sulfate. But when the amount of lime is large, the effect of cement is very small.