Study on precipitation of microcrystalline boehmite from bayer process solutions
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This study was carried out to develop a process for synthesising ultra-fine boehmite powders by precipitation from the Bayerprocess liquor at a temperature within the range 85 ~ 95 oC. The study was conducted to investigate whether boehmiteproduced by this technique has the same physical properties as those prepared by hydrothermal synthesis at elevatedtemperature and commercially available for use as fire retardant in plastic making. As with gibbsite, the precipitation ofboemite requires seeding in which α-boehmite seeds were first produced by pyrolysis of a plant ultra-fine gibbsite at 420 oCfor 60 min. The boehmite seeds of mean particle size (D50) of 0.30 μm were obtained through subsequent hydrothermalsynthesis. This process would yield a high purity well-crystalline boehmite of 1.30-1.47 μm mean particle size of low surfacearea (2 ~ 4 m2/g) as required for commercial fire retardants.
Abstract
This study was carried out to develop a process for synthesising ultra-fine boehmite powders by precipitation from the Bayerprocess liquor at a temperature within the range 85 ~ 95 oC. The study was conducted to investigate whether boehmiteproduced by this technique has the same physical properties as those prepared by hydrothermal synthesis at elevatedtemperature and commercially available for use as fire retardant in plastic making. As with gibbsite, the precipitation ofboemite requires seeding in which α-boehmite seeds were first produced by pyrolysis of a plant ultra-fine gibbsite at 420 oCfor 60 min. The boehmite seeds of mean particle size (D50) of 0.30 μm were obtained through subsequent hydrothermalsynthesis. This process would yield a high purity well-crystalline boehmite of 1.30-1.47 μm mean particle size of low surfacearea (2 ~ 4 m2/g) as required for commercial fire retardants.
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