Seed separation granularity controlling method in alumina producing Bayer process
A technology of alumina and Bayer method, which is applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of production organization related process operation difficulties, etc., and achieve the effect of stable product particle size system, reasonable particle size distribution of seed crystals, and reasonable and stable particle size distribution
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Embodiment 1
[0033] The Coulter particle size analyzer can detect the number of particles of different particle sizes of aluminum hydroxide powder, that is, the particle size-the particle size distribution diagram (Figure 1, Figure 2), which we call the Coulter particle size analysis Graphic features. The smallest particle size that can be detected by the Coulter particle size analyzer is 3.918μm. Malvern particle size analyzer can detect the volume percentage of different particle sizes of aluminum hydroxide powder.
[0034] Judging from the graphical characteristics analyzed by Kurt, in a relatively short period of time (2 to 3 days), the number of fine aluminum hydroxide particles in the system increased significantly (from Figure 1→2), and the average particle size decreased to about 15μm. , The distribution of fine particles around 3.918μm is relatively large, and the fine particles of Malvern-25μm grow slowly for 3 consecutive days. When the content of fine particles rises to about 2%, i...
Embodiment 2
[0036] When the graphic features analyzed by Kurt are shown in Figures 3 and 4, the peak value of fine particle distribution is 40-60μm, the average particle size is 30μm-40μm, and the fine particle distribution at 3.918μm is very small, and its value drops to 200 About, the content of fine particles in the aluminum hydroxide of the system is very low, and the content of fine particles is further reduced, and the peak of the pattern distribution continues to shift to the right; the Malvern -25μm fine particles grow slowly for 3 consecutive days, and the -15μm fine particle content decreases to 0. It is judged that the particle size distribution of the system has entered the final stage of refinement. At this time, measures such as reducing the agglomeration temperature by 0.5°C, and the growth of the first tank by 0.5°C, can decompose the system fine particle changes to normal after 5 to 7 days, and avoid the appearance of larger sieving particle size. Great fluctuations.
Embodiment 3
[0038] Judging from the graphical characteristics of Kurt’s analysis, the average particle size dropped below 20μm, and within a short period of time (2 to 3 days), the number of fine aluminum hydroxide particles in the system increased significantly (from Figure 5→6) , The particle value at 3.918μm continues to rise to above 5000~10000, and the wave peak at the coarser particle size disappears; Malvern -25μm fine particles slowly decrease to about 1% for 3 consecutive days, and the content of -2.5μm fine particles is about 0.5% It can be judged that the particle size distribution of the system has entered the final stage of coarsening. At this time, measures such as increasing the agglomeration temperature by 0.5°C, and the growth of the first tank by 0.5°C, can decompose the system fine particle changes to normal after 5-7 days, avoiding sieving There is a big fluctuation in the sub-particle size.
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