Coal-based solid waste soil stabilizer and preparation method thereof

Abstract

The invention belongs to the technical field of soil solidification, and relates to a coal-based solid waste soil solidifying agent and a preparation method thereof. The problem that when the fluidized bed combustion ash is used as a soil stabilizer, a structure is prone to shrinkage and cracking after curing is solved. The soil stabilizer comprises the following components in parts by weight: 50-80 parts of fluidized bed combustion ash, and 5-15% of silica fume, 3-5% of sulfate and sodium hydroxide, 0.1-0.5% of a water reducing agent and 0.3-0.6% of polyvinyl alcohol fiber which account for the mass percent of the fluidized bed combustion ash. The treated materials are stirred for 10-15 min at the rotating speed of 150-300 r / min, and mixed powder is obtained; under the action of the exciting agent, the secondary hydration reaction process of the mineral admixture and calcium hydroxide is accelerated, so that hydration products are crossed and overlapped with one another to form a compact network structure system, and a structure is prevented from shrinking and cracking.

Description

technical field [0001] The invention belongs to the technical field of soil solidification, and relates to a coal-based solid waste soil solidifying agent and a preparation method. Background technique [0002] Sulfur-fixing ash is an industrial solid waste produced by the use of circulating fluidized bed boiler technology with inferior fuels such as coal gangue, lignite, and coal slime. A substantial increase in the amount of slag has come. Desulfurization ash and slag are piled up in large quantities, which will pollute the environment, cause ecological damage, and affect human health while occupying a large amount of land. The environmental protection tax generated by solid waste discharge has caused a huge economic burden to enterprises. Therefore, the resource utilization of sulfur-fixing ash and slag needs to be expanded urgently. [0003] The chemical composition of sulfur-fixing ash contains a large amount of silicon-alumina oxide, free calcium oxide and sulfur tr...

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Problems solved by technology

[0005] In recent years, the output of sulfur-fixed ash has been increasing every year. At present, the sulfur-fixed ash used in soil curing agents is usually made by mixing uniformly with quicklime, activator, early strength agent, silica fume, and polyacrylamide; but in In the actual application process, the curing effect is still not ideal, and the problem of shrinkage and cracking of the structure will appear after adding the curing agent

Moreover, the sulfur-fixing ash is a loose and porous structure. If a conventional water reducing agent is used, the water reducing agent will be adsorbed in the gaps of the sulfur-fixing ash during the hydration process, resulting in an increase in the amount of the water reducing agent.

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