Building hollow brick prepared by dredged sludge and preparation method thereof

Abstract

The invention discloses a building hollow brick prepared by dredged sludge. The building hollow brick is prepared from the following raw materials in parts by weight: 10 to 28 parts of dredged sludge (weight after dehydration), 30 to 55 parts of coal gangue, 8 to 16 parts of quick lime, 4 to 8 parts of gypsum, 10 to 18 parts of water glass, 10 to 15 parts of cement, and an accelerator which is 0.2 to 0.4 percent of the total weight of the raw materials. The invention also discloses a method for preparing the building hollow brick by using the dredged sludge. The method comprises the following steps: processing raw materials, stirring and mixing, pressing for molding, and maintaining, thereby obtaining a finished product. By adopting the technical scheme, a great amount of coal gangue is consumed, and thus the floor occupation is gradually reduced; when the water content of the dredged sludge reaches a certain value, the dredged sludge can be used, so that the water consumption is reduced, the stacking time is reduced, and the occupied floor is further reduced; and meanwhile, a great number of harmful substances generated by decomposing organic matters in the naturally drying process of the dredged sludge are reduced, so that the environmental pollution caused by the harmful substances is avoided.

Description

technical field [0001] The invention belongs to the field of building material production, more specifically, the invention relates to a building hollow brick prepared from dredged mud and a preparation method thereof. Background technique [0002] To use dredged silt as a material, it is necessary to change its high water content and low strength characteristics. The existing technology uses mechanical dehydration and drying of dredged silt. The investment in dehydration equipment is very large. At the same time, dredged silt also contains a large amount of organic matter. Use Chemical methods are also used to remove coal gangue; coal gangue is a kind of mining solid waste, including gangue washing in coal washing plants, hand-selected gangue in coal production, coal and rock discharged from semi-coal roadway and rock roadway excavation, and coal and coal A mixture of white gangue other than coal series piled together with gangue; about 1000Mt of gangue has been accumulated i...

AI Technical Summary

Problems solved by technology

[0002] To use dredged silt as a material, it is necessary to change its high water content and low strength characteristics. The existing technology uses mechanical dehydration and drying of dredged silt. The investment in dehydration equipment is very large. At the same time, dredged silt also contains a large amount of organic matter. Use Chemical methods are also used to remove coal gangue; coal gangue is a kind of mining solid waste, including gangue washing in coal washing plants, hand-selected gangue in coal production, coal and rock discharged from semi-coal roadway and rock roadway excavation, and coal and coal A mixture of white gangue other than coal series piled together with gangue; about 1000Mt of gangue has been accumulated in my country, and about 100Mt of gangue is still discharged every year. The stacking of coal and gangue will occupy a large amount of land. During the natural drying process of dredged silt, the decomposition of organic matter will produce a large amount of harmful substances, which is also a source of environmental pollution.