| 摘要 |
CONTROL OF FORM OF CRYSTAL PRECIPITATION OF ALUMINUM HYDROXIDE USING COSOLVENTS AND VARYING CAUSTIC CONCENTRATION Disclosed is generally spherical aluminum hydroxide particles comprised of solid crystals of aluminum hydroxide or its partially or completely dehydrated derivatives, the crystals extending radially outwardly from a central core region and having a shape of lamellar or acicular, the aluminum hydroxide particle density ranging from 0.3 to 2.5 gms/cc. A process is disclosed for the control of the particle form of aluminum hydroxide crystals precipitated from an alkali metal aluminate solution which comprises either the use of certain monohydric and polyhydric alcohols or controlling the caustic concentration of the sodium aluminate solution or a combination whereby particles shapes may be produced principally comprising acicular form or principally comprising lamellar form, depending upon the caustic concentration of the alkali metal hydroxide and the vol.% of the alcohol. |
