Support material for silicon magnesite and preparation method of support material

Abstract

The invention discloses a support material for silicon magnesite and a preparation method of the support material. The support material for the silicon magnesite is prepared from the following raw materials in parts by weight: 100 parts of light calcined magnesia, 80 to 85 parts of magnesium chloride solution, 13 to 25 parts of coal ash, 12 to 18 parts of wood dust, 0.5 to 0.7 part of sodium polyphosphate, 0.5 to 0.7 par of triethanolamine, 5 to 7 parts of ferrous sulfate, and 0.2 to 0.4 part of phosphoric acid. The raw materials of the support material for silicon magnesite comprise an appropriate amount of sodium polyphosphate, triethanolamine, the ferrous sulfate and the phosphoric acid, so that the water stability of the support material for the silicon magnesite is improved; and meanwhile, compared with the support material without the components, the compressive strength and the bending resisting strength of the support material for the silicon magnesite are improved to certain extent.

Description

technical field [0001] The invention belongs to the field of mine building materials, and in particular relates to a silicon-magnesium mine support material and a preparation method thereof. Background technique [0002] In order to improve the production capacity and modernization level of mines, coal mines usually adopt large mining height coal mining technology. Therefore, in order to ensure smooth ventilation in mines, pit logs are used for roadway support. The diameter of pit logs is 300mm and the length is 1500mm. Calculation, if the stack height is calculated as 4.5m, then each stack needs to consume 3.18m 3 Timber, the distance between each stack is 2.5m, so that the wood consumption per kilometer is 1272m 3 , timber at 1200 yuan / m 3 Calculated, the cost of purchasing wood for every 1000m of roadway is 1.53 million yuan. The consumption of such a large amount of wood will also bring a greater economic burden to the mine. In addition, my country's forest coverage ...

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Problems solved by technology

[0003] It has been reported that magnesium oxychloride cementitious materials are used to replace wooden packing boxes, manhole covers, ventilation pipes, etc., but magnesium oxychloride cementitious materials have not been used as roadway support materials, and they have the following disadvantages: ①Weak water resistance, ordinary High-quality magnesite products are soaked in water for 28 days, and their strength drops by 70-80%; ②It is easy to absorb moisture and return to brine. In a humid environment or in a rainy season, large water droplets appear on the surface of the product, and even water droplets flow; ③Condensation in summer If the time is too fast, the heat of reaction will be concentrated, which will not only affect the production operation, but also easily cause warping and deformation of the product; ④ Improper proportioning or too high content of active magnesium oxide in the raw material will cause too fast reaction and concentrated heat, which will not only affect the production operation, And it is easy to cause warping and deformation of the product

If the above defects cannot be well solved in production, it will not only reduce the product quality, but also cause engineering accidents.

Therefore, it is not feasible to directly use magnesium oxychloride cementitious materials for roadway support materials

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