| CPC C04B 18/023 (2013.01) [C04B 18/08 (2013.01); C04B 18/12 (2013.01); C04B 18/24 (2013.01); C04B 18/30 (2013.01); C04B 20/04 (2013.01)] | 11 Claims |
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1. A lightweight solid waste porous aggregate, comprising the following raw materials in parts by mass: 50 parts to 80 parts of a coal gangue, 20 parts to 50 parts of a fly ash, and 1 part to 3 parts of a straw;
the lightweight solid waste porous aggregate is prepared by a method including:
immersing the straw in an alkali solution to obtain a pretreated straw; the alkali solution is a sodium hydroxide solution having a mass percentage concentration of 2% to 4%; and the immersing is conducted at a temperature of 18° C. to 22° C. for 5 h to 7 h;
mixing a part of the fly ash and a part of the coal gangue, then subjecting a resulting blend to first granulation, and then passing resulting pellets obtained in the first granulation through a 4 mm square hole sieve to remove a residual material that has not been formed into pellets to obtain an upper core material having a particle size of 5 mm; and a mass ratio of the part of the fly ash to the part of the coal gangue is in a range of (20-50) (80-50);
mixing a remaining of the fly ash, a remaining of the coal gangue, and the pretreated straw to obtain a mixture, and then subjecting the mixture to second granulation such that the mixture wraps the core material, and then selecting out a raw material globule having a particle size of 10 mm; and a mass ratio of the remaining of the fly ash, the remaining of the coal gangue, and the pretreated straw is in a range of (20-50):(80-50):(1-4.5); and
subjecting the raw material globule to drying and calcination in sequence to obtain the lightweight solid waste porous aggregate.
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