Evolution of particle size and strength of Al(OH)_3 from carbonization in sodium aluminate liquor Article Summary
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Published: March 20, 2004
The particle size distribution and attrition index of continuous carbonization products from sodium aluminate solution were studied according to the industrial production conditions.The results show that there are differences in particle size and attrition index among products precipitated at different stages.The content of particles below 45 μm at the initial stage is more than 38%.With the decreasing of fine particles content,the product's mean particle size increases rapidly while a little changes at later stages.The fine particles precipitated at the earlier stage(e.g.after 1 h) have a lowest attrition index,but the fast aggregated product is smaller than others in strength,and the product cemented by the newly subsequent precipitated gibbsite shows some increment in strength.The SEM indicates that there are some fine particles among the agglomerates,which show the "mosaic" structure,and with the progress of precipitation,the constituted particle sizes of the agglomerates approach uniformly.