Method for producing tobermorite and aluminum oxide according to coal ash sintering hydrothermal method

• Main Authors: CUI DECHENG, LI GUANGZHU, BI SHIWEN, PAN XIAOLIN, LI NA, TU GANFENG, YU HAIYAN
• Format: Patent
• Language: English
• Published: 29.04.2015
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; COMPOUNDS THEREOF; CONCRETE; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INORGANIC CHEMISTRY; LIME, MAGNESIA; METALLURGY; NON-METALLIC ELEMENTS; REFRACTORIES; SLAG; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF NATURAL STONE

The invention relates to a method for producing tobermorite and aluminum oxide according to a coal ash sintering hydrothermal method. The method provided by the invention comprises the following steps: carrying out chemical beneficiation; (2) preparing raw slurry; (3) sintering to prepare a clinker; (4) dissolving out the clinker, and separating and washing the clinker; (5) preparing tobermorite precursor original slurry; (6) hydrothermally synthesizing to prepare a tobermorite precursor; (7) hydrothermally synthesizing to prepare a tobermorite filter cake. By comprehensively utilizing coal ash, the method provided by the invention can be used for producing tobermorite and aluminum oxide, so that the silicon mineral source is replaced, the bauxite resource is replaced, and resources such as land are saved; moreover large-scaled economic production can be realized. Therefore, a solid base is laid for comprehensively utilizing silicon dioxide and aluminum oxide components in coal ash on a large scale to realize resource utilization of solid wastes.