In the production of aluminum hydroxide powder, different temperatures have a certain influence on its particle size, so in order to ensure the efficiency of the product, it is necessary to introduce its specific molding state.
Aluminum hydroxide micropowder prepared by neutralization with sodium metaaluminate and dilute nitric acid, the slurry obtained at different neutralization temperatures is aged for different times, and its particle size changes little.
To prepare a micropowder of larger particles, a higher neutralization temperature should be used as much as possible. Due to cost considerations, lowering the aging temperature by 25 ℃ has little effect on the particles, and the aging time is not too long. Generally, it is appropriate to control it at 0.5h. To obtain aluminum hydroxide micropowder with small particle size (<20μm), it is necessary to control a lower neutralization temperature and aging temperature. the neutralization temperature can be 50 ℃ and the aging time can be 0.5h h.
Under the condition of high temperature neutralization at 70 ℃, the median particle size is 28~30 μm, and the median particle size of micropowder obtained under the condition of 50 ℃ neutralization is 17~20 μm. The effect of aging time on particle size is much smaller than that of neutralization temperature.
After 40 ℃ and aging at different temperatures, the particle size will become smaller, so low temperature aging can be adopted; and after 75 ℃ and, the effect of different temperature aging on the particle size of aluminum hydroxide powder is not very significant, the particle size change is very small, so low temperature aging can also be used.
If you want to get larger particles of aluminum hydroxide powder, and at a lower temperature, the aging time should be shortened as much as possible, generally 0.5h can be used, and at a higher temperature, the effect of aging time on its particle size is not very large, according to the need for aging time can be used 0.5~1h.3.
The particle size of aluminum hydroxide powder needs to be determined according to the customer's use requirements, the budget and cost that can be used, so this parameter should be understood when purchasing the product so as to better use the product.