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METHOD FOR PREPARING NANO SILICA AND NANO CALCIUM CARBONATE USING RICE HULL ASH AND FLUE GAS
METHOD FOR PREPARING NANO SILICA AND NANO CALCIUM CARBONATE USING RICE HULL ASH AND FLUE GAS
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机译:利用稻壳灰和烟气制备纳米二氧化硅和碳酸纳米钙的方法
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摘要
A method for preparing nano silica and nano calcium carbonate using rice hull ash and flue gas. The method includes: 1) adding rice hull ash to a sodium hydroxide solution, to yield a first mixed solution; stirring and heating the first mixed solution; then filtering the first mixed solution to yield a first filtrate; 2) adding the first filtrate to a reaction still, and diluting the first filtrate; adding polyethylene glycol as a dispersant to the reaction solution; introducing flue gas to the reaction solution; filtering the reaction mixture to yield a first filter cake and a second filtrate; washing the first filter cake to a neural pH, slurrying and drying the first filter cake to yield nano silica; and 3) mixing the second filtrate and a washing solution collected from 2); adding a calcium hydroxide solution to the reaction still, to yield nano calcium carbonate.
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