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Mining support column and preparation method thereof

A mining, cuboid technology, applied in mining equipment, pillars/supports, earthwork drilling, etc., can solve the problems of reactive magnesium oxide content too fast, affecting production operations, causing engineering accidents, etc., achieving light weight and easy operation. , the effect of reducing mass

Inactive Publication Date: 2018-05-11
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Mining support column and preparation method thereof
  • Mining support column and preparation method thereof
  • Mining support column and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0045] The first preparation method of the above-mentioned mine support column includes:

[0046] The preparation step of the slurry is to add raw materials other than light-burned magnesia, wood chips, fly ash and glass fiber into the magnesium chloride solution, dissolve and mix evenly, then add light-burned magnesia, stir and mix evenly, and then add sawdust and pulverized coal The mixture of ash is stirred and mixed evenly to obtain a slurry;

[0047] In the slurry mold loading step, first pour part of the slurry into the mold and flatten it so that the thickness of the slurry is 6-8mm, then evenly scatter the glass fibers on the slurry, and then pour part of the slurry and Flatten, so that the thickness of the poured slurry is 6-8mm after being flattened, spread the glass fiber evenly on it again, and then pour in part of the slurry again and spread it, so that the poured slurry is flattened again The final thickness is 6-8mm, and then according to the design of the holl...

Embodiment 1

[0063] The structure of the mine support column prepared in this embodiment is as follows: the outside is rectangular parallelepiped, and the inner center is provided with a hollow structure along the length direction of the rectangular parallelepiped. The hollow structure is a cylindrical hollow structure. The diameter of the cylindrical hollow structure is 72mm. The solid section 4 and the second end hollow section 5, the first end hollow section 1, the first solid section 2, the central hollow section 3, the second solid section 4 and the second end hollow section 5 are sequentially connected, that is, along In the length direction of the cuboid, from one end to the other, the central position of the cuboid, that is, the axis position, is sequentially hollow segment, solid segment, hollow segment, solid segment and hollow segment. The specifications of the cuboid are: 1500mm×150mm×120mm (length×width×height); see figure 1 , the lengths of the first hollow segment at the en...

Embodiment 2

[0073] The structure of the mine support column prepared in this embodiment is the same as that of Example 1. Except that the raw materials are different from Example 1, other preparation processes are the same as in Example 1. The ratio of raw materials used in the support column of this embodiment is:

[0074] 100 parts by weight of light-burned magnesium oxide, 80 parts by weight of magnesium chloride solution, 15 parts by weight of fly ash, 17 parts by weight of wood chips, 0.6 parts by weight of sodium phosphate, 0.5 parts by weight of tetrabutylammonium chloride, and 8 parts by weight of glass fiber. Wherein, the activity index of the light-burned magnesium oxide is 62%, and the concentration of the magnesium chloride solution is 28wt%.

[0075] From a batch of supporting pillars prepared in this embodiment, three are selected for testing, and the average value thereof is obtained, wherein, the compressive strength is 62.1MPa, the flexural strength is 20.5MPa, the compres...

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Abstract

The invention discloses a mining support column and a preparation method thereof. The support column 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 pulverized fuel ash, 12 to 18 parts of wood bits, and 0.2 to 0.7 part of sodium phosphate. According to the support column providedby the invention, appropriate amount of sodium phosphate is contained in the raw materials so as to be used as a modifier, so that the water stability of the support column is improved; compared witha support column without sodium phosphate or with other modifiers, the compressive strength and the breaking strength of the support column are improved to a certain degree, and after appropriate amount of ferrous sulfate and phosphoric acid are cooperated to use, the effect is better; in addition, the mining support column is good in slurry divergence, good in working performance, and convenientto operate.

Description

technical field [0001] The invention belongs to the field of mine building materials, and in particular relates to a mine support column 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 rate is only 14%, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/32E21D15/00
CPCC04B28/32C04B2201/50C04B2201/52E21D15/005C04B18/08C04B18/26C04B22/16C04B22/149C04B22/165C04B24/12C04B14/42
Inventor 王雨利金祖权何小芳郭晖史才军管学茂
Owner HENAN POLYTECHNIC UNIV
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