PRODUCTION OF POROUS DIATOMACEOUS SHELL HAVING IMPROVED QUALITY FROM DIATOMACEOUS EARTH

PURPOSE:To obtain the above diatomaceous shell having high whiteness and useful as a filter aid, catalyst carrier, food additive, etc., by adding an aqueous solution of an Al compound to diatomaceous earth, subjecting to hydrothermal treatment to obtain a kaolinized material, dispersing the product...

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Main Authors NOGUCHI YASUHIKO, MIZUTA HIROYUKI, SHIBAZAKI YASUO, TASHIRO ATSUHIKO, KUROHIJI SETSUO
Format Patent
LanguageEnglish
Published 22.08.1989
Subjects
CHEMISTRY
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
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Summary:PURPOSE:To obtain the above diatomaceous shell having high whiteness and useful as a filter aid, catalyst carrier, food additive, etc., by adding an aqueous solution of an Al compound to diatomaceous earth, subjecting to hydrothermal treatment to obtain a kaolinized material, dispersing the product with a deflocculant and precipitating and separating the product. CONSTITUTION:An aqueous solution of an Al compound (e.g., AlCl3) is added to diatomaceous earth at an Al/Si molar ratio of <=1.0, subjected to hydrothermal reaction, filtered and washed with hydrochloric acid to obtain a kaolinized material. The kaolinized material is added with water and about 0.1% (based on the dried weight of the kaolinized material) of a deflocculant (e.g., sodium silicate, sodium pyrophosphate or NH3 water), dispersed with a forced dispersing apparatus (e.g., homomixer) or an ultrasonic dispersing apparatus and left standing to separate the precipitate composed mainly of diatomaceous shell from a suspension containing a solid component composed mainly of kaolinite. If necessary, the same separation procedure is repeated on the obtained precipitate. Furthermore, the separated diatomaceous shell is calcined at need.
Bibliography:Application Number: JP19880031810