Method and device for dissolving fly ash slurry out by hybrid acid heating method

• Main Authors: GUO ZHAOHUA, NAN QINGAN, DONG HONG, ZHANG WANDE, ZHOU ZHENGMING, CHI JUNZHOU, WANG YONGWANG
• Format: Patent
• Language: Chinese; English
• Published: 05.10.2011
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INORGANIC CHEMISTRY; METALLURGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention relates to a method and a device for dissolving fly ash slurry out by a hybrid acid heating method. The method comprises the following steps of: preheating the slurry, namely preheating proportioned fly ash and hydrochloric acid mixture slurry in a preheating device, and raising the temperature to be between 40 and 70 DEG C; heating the slurry, namely heating the preheated slurry in a reaction kettle by using live steam until the temperature is between 140 and 160 DEG C, and preserving the heat for 0.5 to 2 hours; and performing concentration temperature reduction on the reacted slurry dissolved out from the reaction kettle in a flash evaporator until the temperature is between 118 and 125 DEG C, and feeding the cooled slurry into a diluting tank. The method and the device have a core status in the whole process for preparing aluminum oxide by a fly ash acid method. By the process, the aluminum oxide in the fly ash is reacted with hydrochloric acid and is dissolved out in an aluminum chloride fo