Coal gangue sandstone sponge brick and preparation method thereof

Abstract

The invention belongs to the technical field of comprehensive utilization of solid waste resources, and particularly relates to a coal gangue sandstone sponge brick and a preparation method thereof. The coal gangue sandstone sponge brick is prepared from, by mass, 50%-80% of coal gangue, 20%-50% of sandstone and a binder solution accounting for 6%-8% of the total mass of the coal gangue and the sandstone. The preparation method comprises the following steps: S1, weighing the coal gangue, the sandstone and the binder solution in proportion, stirring the coal gangue and the sandstone, slowly dropwise adding the binder solution in the stirring process, and continuously conducting stirring uniformly to obtain a mixture; and S2, putting the mixture into a mold, generating a green body through pressure of a pressing machine, placing the green body in a room for drying in the shade, then conducting drying, putting the green body into a firing plate, and conducting firing, so as to obtain a sponge brick. According to the invention, the sandstone is used as a flux and a skeleton structure, and pores are left after the residual coal of the coal gangue is combusted, so that the prepared sponge brick has high compressive strength and good water-retaining property, and a new way is provided for comprehensive utilization of solid waste resources.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of solid waste resources, and in particular relates to a coal gangue sandstone sponge brick and a preparation method thereof. Background technique [0002] Coal gangue is solid waste produced during coal mining and washing. It is a black-gray rock with low carbon content and harder than coal that is associated with coal seams during the coal formation process. Gangue, gangue extracted from the roof, floor and interlayer during the mining process, and gangue picked out during the coal washing process. With the development of science and technology, the annual coal production of Shanxi Coal Group has been increasing, and the amount of natural coal gangue solid waste has also increased. At present, coal gangue is basically disposed of in the form of outdoor piles. A large number of piles of coal gangue will not only occupy the land and affect the ecological environment, but the gan...

AI Technical Summary

Problems solved by technology

Broken porcelain is affected by the building ceramics industry. Generally, sponge brick production bases can only be built near building ceramics companies. At the same time, the amount of broken porcelain depends on the finished product rate of ceramic companies. In addition, additional sintering aids need to be added, which increases production costs.