A preparation method of fly ash-slag-based cemented filling material

A technology of cementing filling materials and fly ash, which is applied to filling materials, mining equipment, earthwork drilling and mining, etc., can solve the problems of poor environmental protection and high cost, and achieve the effects of reducing pollution, fine particle size, and improving recycling efficiency

Active Publication Date: 2022-06-24
新疆维吾尔自治区煤炭科学研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Based on the above analysis, the object of the present invention is to provide a preparation method of fly ash-slag-based cemented filling material, which is used to solve the shortcomings of high cost and poor environmental protection of coal mine cemented filling materials in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) First, use a crusher to crush the large pieces of gangue, and screen the crushed gangue particles into 0-1mm and 1-2mm particles through a screen, and the proportion of 0-1mm particles is 62%.

[0027] (2) Weigh 45Kg of slag and 55Kg of fly ash and mix them into a high-speed pulverizer for grinding for 20 minutes. The grinding method is: grinding for 5 minutes and stopping for 1 minute to obtain slag-fly ash fine powder.

[0028] The main components of the slag are CaO, Al 2 O 3 , SiO 2 , MgO.

[0029] The fly ash has a CaO content of 28% and a free calcium oxide (f-CaO) content of 5.4%.

[0030] The rotating speed of the high-speed pulverizer is 5100r / min, and the discharge fineness is 5~10um.

[0031] (3) Take 50Kg of waste hot water from a thermal power plant at 25°C and place it in a thermal insulation bucket, add the slag-fly ash fine powder ground in step (2) into the thermal insulation bucket, and stir for 1 hour at a stirring speed of 30 r / min. , made o...

Embodiment 2

[0037] (1) First, use a crusher to crush the large pieces of gangue, and sieve the crushed gangue particles into 0-1mm and 1-2mm particles through a screen, and the proportion of 0-1mm particles is 65%.

[0038] (2) Weigh 47Kg of slag and 53Kg of fly ash and mix them into a high-speed pulverizer for grinding for 25 minutes. The grinding method is: grinding for 5 minutes and stopping for 1 minute to obtain slag-fly ash fine powder.

[0039] The main components of the slag are CaO, Al 2 O 3 , SiO 2 , MgO.

[0040] The CaO content of the fly ash is 30.5%, wherein the content of free calcium oxide (f-CaO) is 5.8%.

[0041] The rotating speed of the high-speed pulverizer is 5200r / min, and the discharge fineness is 2~6um.

[0042] (3) Weigh 47.6Kg of 30°C waste hot water from a thermal power plant and place it in a thermal insulation bucket, add the slag-fly ash fine powder ground in step (2) into the thermal insulation bucket, and stir for 2.5 hours at a stirring speed of 30 t...

Embodiment 3

[0048] (1) First, use a crusher to crush the large pieces of gangue, and screen the crushed gangue particles into 0-1mm and 1-5mm particles through a screen, and the proportion of 0-1mm particles is 67%.

[0049] (2) Weigh 49Kg of slag and 51Kg of fly ash and mix them into a high-speed pulverizer for grinding for 30 minutes.

[0050] The main components of the slag are CaO, Al 2 O 3 , SiO 2 , MgO.

[0051] The CaO content of the fly ash is 35.7%, of which the content of free calcium oxide (f-CaO) is 6.4%.

[0052] The speed of the high-speed pulverizer is greater than 5200r / min, and the fineness of the discharge is 2~5um.

[0053] (3) Take 44.4Kg of thermal power plant waste hot water at 40°C and place it in a thermal insulation bucket, add the slag-fly ash fine powder ground in step (2) into the thermal insulation bucket, and stir for 3 hours at a stirring speed of 30 r / min , made of slag-fly ash cementitious slurry.

[0054] (4) Weigh 77.8Kg of gangue particles of 0-1mm ...

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Abstract

The invention discloses a preparation method of a fly ash-slag-based cemented filling material, which belongs to the field of mine filling materials. A method for preparing a fly ash-slag-based cemented filling material includes the following steps: (1) Breaking large pieces of gangue into fine particles of 0-1mm and 1-2mm, wherein the proportion of 0-1mm particles is more than 60% ; (2) Put the mixture of slag and fly ash into a high-speed pulverizer and grind for 20-30 minutes to obtain slag-fly ash fine powder; Ash fine powder is blended according to 1: (2~2.5), and stirred for 1~4h to make slag-fly ash cementitious slurry; The slurry is blended according to (35~40): (60~65), and the coal mine cemented filling material is made after stirring evenly. The cemented filling material prepared by the invention does not need to add an activator, has lower cost and better environmental protection.

Description

technical field [0001] The invention relates to the field of mine filling materials, in particular to a preparation method of a fly ash-slag-based cemented filling material. Background technique [0002] With the rapid development of coal-electricity integration, many thermal power plants are built near coal mines in order to ensure coal supply for thermal power plants and save coal transportation and storage costs. [0003] A large amount of industrial wastes are generated during the operation of thermal power plants, such as fly ash and waste heat (including cooling water, high temperature flue gas, high temperature steam, etc.), among which the cooling water of thermal power plants is generally at 20~50℃. rate is not high. [0004] Mining of coal forms goafs, causing the overlying strata to break and collapse, resulting in the destruction of aquifers and the surface, resulting in the loss of water resources, damage to buildings, damage to vegetation and other adverse con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/08E21F15/00C04B18/08C04B18/12
CPCC04B28/08E21F15/005C04B2111/00724C04B18/08C04B18/12C04B22/0046Y02W30/91
Inventor 王震娄芳金士魁贾永勇
Owner 新疆维吾尔自治区煤炭科学研究所
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