Low-cost quick-setting expansible hole-sealing material applied to coal mine

Abstract

The invention discloses a low-cost quick-setting expansible hole-sealing material applied to coal mine. The low-cost quick-setting expansible hole-sealing material applied to the coal mine is prepared from the following raw materials: 30-50 parts of coal gasification fine ash, 25-35 parts of sulpho aluminate cement, 0.04-0.15 part of citric acid, 5-10 parts of quick lime, 20-25 parts of gypsum and 2-3 parts of sodium hydroxide. The low-cost quick-setting expansible hole-sealing material applied to coal mine has the advantages that a large amount of coal gasification fine ash which is industrial solid waste (the waste of coal chemical industry) is added into the raw materials, and the waste is utilized and is changed into wealth; the cost of the hole-sealing material is greatly reduced to 600 RMB per ton under the condition that the strength and expansion rate meet the requirements. The hole-sealing material is innocuous, unpoisonous and pollution-free, can be used for sealing holes in gas drainage of the coal mine and can also be used for sealing holes, opening sealing and blocking leakage air during post-grouting and reinforcing of walls of coal mine laneways; the large amount of the coal gasification fine ash is added into the raw materials, so that the hole-sealing material has obvious environmental protection significance; an important thinking is provided for clean production in the coal chemical industry.

Description

technical field [0001] The invention relates to a sealing material for coal mines, in particular to a low-cost quick-setting expansive sealing material for coal mines. Background technique [0002] Coal provides important energy support for the rapid development of my country's national economy. With the increase of coal mining depth, gas disasters become more and more serious. Gas drainage or drainage is a fundamental measure to solve gas disasters, and sealing materials with low cost, reliable quality and easy use are one of the necessary and key conditions for the success of gas drainage or extraction. At present, polyurethane products or cement mortar are mostly used as sealing materials. However, the cost of polyurethane sealing materials is relatively high, and the price is about 20,000 yuan / ton. Cement mortar sealing is not only inconvenient to operate, but also the sealing quality is poor. Therefore, the fast-setting high-strength expansive sealing material prepa...

AI Technical Summary

Problems solved by technology

However, although these sealing materials have good sealing effect, the cost is still slightly high

Chinese patent application CN103193449A (published date: 2013.07.10) discloses a quick-setting micro-expansion sealing material. Some fly ash (waste from coal-fired power plants) is added to the raw material, but the amount added is not large, although The cost has decreased, but the expansion rate is not high (from the data published in the manual, it can be seen that the free expansion rate of one day is only 1.2~1.8%)

The coal gasification fine ash, the waste of the coal chemical industry, is still stored as waste and has not been utilized.