Method for dissociating industrial by-product gypsum and crystallizing to grow calcium sulphate crystal whiskers

The invention provides a method for dissociating industrial by-product gypsum and crystallizing to grow calcium sulphate crystal whiskers. The method comprises the following steps of: performing the pre-treatments of washing, dissociating, and filtering for removal of insoluble impurities on the che...

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Bibliographische Detailangaben
Hauptverfasser:	FENG XIN, WANG GANGLING, SHI LIYI
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE APPARATUS THEREFOR CHEMISTRY COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS CRYSTAL GROWTH INORGANIC CHEMISTRY METALLURGY PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE REFINING BY ZONE-MELTING OF MATERIAL SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE SINGLE-CRYSTAL-GROWTH UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL
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Beschreibung
Zusammenfassung:	The invention provides a method for dissociating industrial by-product gypsum and crystallizing to grow calcium sulphate crystal whiskers. The method comprises the following steps of: performing the pre-treatments of washing, dissociating, and filtering for removal of insoluble impurities on the cheap industrial by-product gypsum used as a raw materials, and dissociating the industrial by-product gypsum with a complex impurity content into pure solution containing calcium ions and sulphate ions; crystallizing the calcium ions and the sulphate ions in the conditions of certain acidity, reaction time, reaction temperature and crystal modifier; controlling crystal growth to prepare the high-grade calcium sulphate crystal whiskers. The prepared calcium sulphate crystal whiskers are 0.1-10 microns in diameter, 20-400 microns in length, 10-150 in length-diameter ratio, and greater than 99% in purity. By adopting the method provided by the invention, the current situation that lots of the industrial by-product gypsu