Lightweight solid waste porous aggregate, and preparation method and use thereof
AssigneeInner Mongolia University of Technology
InventorsXiaoxiao Wang, Rongrong Feng, Changwang Yan, Shuguang Liu, Ju Zhang, Lei Jing, Jie Li, Liqiang Yin
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Abstract
Provided are a lightweight solid waste porous aggregate, and a preparation method and use thereof. The lightweight solid waste porous aggregate includes 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.
Claims11
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.
A method for preparing a lightweight solid waste porous aggregate, the lightweight solid waste porous aggregate, comprising the following raw materials in parts by mass:
- 50 parts to 80 parts of a coal gangrene, 20 parts to 50 parts of a fly ash, and 1 part to 3 parts of a straw;
- and the method comprising:
- immersing the straw in an alkali solution to obtain a pretreated straw;
- wherein 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 after 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;
- wherein 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, 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;
- wherein 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.
Dependencies are inferred from the claim text.