Dry-mixed mortar with coal gangue, and preparation method thereof

Abstract

The invention relates to dry-mixed mortar with coal gangue, and a preparation method thereof. The dry-mixed mortar with coal gangue is characterized in that the dry-mixed mortar with coal gangue is mainly prepared by coal gangue sand, coal gangue powder, lime, gypsum, plasticizer and cement, and dry-mixed mortar with coal gangue comprises the following components according to parts by weight: 75-77.5 parts of coal gangue sand, 12.5-17.5 parts of coal gangue powder, 0-2.5 parts of lime, 1 parts of gypsum, 0-0.02 parts of plasticizer and 1-6 parts of cement; the coal gangue is calcined and activated at the temperature of 750-850 DEG C through the coal gangue sand and the coal gangue powder, then the friction separation of mechanical force is performed to the scalcined and activated coal gangue, the scalcined and activated coal gangue is sieved through a screen with 4.75 mm, and the materials sieved out are coal gangue sand and coal gangue powder. A small amount of cement is only required to be doped to obtain dry-mixed mortar materials with different intensity levels, the main raw materials are solid wastes for production in coal mine, the raw materials can be widely obtained, the cost is low, a great amount of coal gangue can be treated, therefore, the environmental pollution is reduced, and the social benefit and the economic benefit are obvious.

Description

technical field [0001] The invention relates to a coal gangue dry-mixed mortar and a preparation method thereof. Background technique [0002] Coal gangue is a kind of solid waste produced in the process of coal mining. With the continuous development of coal production, the output of coal gangue is increasing day by day. It now covers an area of ​​more than 30 million square meters and has formed more than 1,500 large gangue hills. The volume is nearly 4 billion tons. Doing a good job in the disposal of coal gangue and producing construction engineering materials with coal gangue can not only reduce environmental pollution and safety pressure for the society, but also bring certain economic benefits to enterprises. [0003] The currently known coal gangue mortar is ["Spontaneous Combustion Coal Gangue Mortar" Patent No.: 89108622.6]. This patented technology has found a good way for the resource utilization of coal gangue, which can reduce environmental pollution and safet...

AI Technical Summary

Problems solved by technology

[0004] The coal gangue used in the above-mentioned patented technology needs to undergo spontaneous combustion. When preparing coal gangue mortar, its shortcomings have the following points: 1. The coal gangue cannot be fully burned, and the activity of the material is uncontrollable and the activity is not high.

2. With the effective control of spontaneous combustion gangue hills in coal mines, there are fewer and fewer spontaneous coal gangue hills, and the source of materials for preparing coal gangue mortar is limited to a certain extent

3. Spontaneous coal gangue mortar is processed and prepared on site, which is not conducive to large-scale production

[0005] At present, no technology related to the production of coal gangue mortar from non-spontaneous coal gangue has been found in China

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