Method for fully preparing silicon dioxide and liquid polyaluminum ferric chloride calcium from fly ash

• Main Authors: CHEN ZHEHONG, LIN LI, SHEN PENGFEI, JIANG JIANGUO, WANG JINGYUE, JU TONGYAO, DENG YONGCHI
• Format: Patent
• Language: Chinese; English
• Published: 03.12.2021
• Subjects: CHEMISTRY; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention discloses a method for fully preparing silicon dioxide and liquid polyaluminum ferric chloride calcium from fly ash. The method includes following steps: uniformly mixing the fly ash with a proper amount of sodium carbonate, and firing the mixture at a high temperature of 850-900 DEG C for 1-2 hours to obtain a sintered product; then cooling the sintered product, mixing the sintered product with hydrochloric acid for reaction, and performing centrifugation and filtration separation to respectively obtain filtrate and precipitate; and washing and drying the precipitate to obtain a silicon dioxide product; adding zeolite into the filtrate, performing standing treatment, and taking supernate; and adding alkali liquor into the supernate to adjust the pH value to 3.5-4.0, carrying out alkalization polymerization reaction at 50-80 DEG C for 20-50 minutes, and curing the mixture for 3-5 hours to obtain the liquid polyaluminum ferric calcium chloride. The method has the advantages of simplicity, high pu