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CN-121609539-B - Coal mine powder slag grouting material and preparation method and application thereof

CN121609539BCN 121609539 BCN121609539 BCN 121609539BCN-121609539-B

Abstract

The invention belongs to the technical field of solid waste treatment, and provides a coal mine powder slag grouting material, a preparation method and application thereof, wherein the coal mine powder slag grouting material is prepared from the following raw materials of 70-80 parts of activated coal mine powder slag, 30-40 parts of aluminum ash aqueous solution, 17-25 parts of aggregate, 8-12 parts of plant fiber, 7-10 parts of silica sand, 2-2.5 parts of water reducer and 10-15 parts of mixing water. Activated coal mine powder slag is subjected to alkaline conditions to obtain small units containing Si-O-Si bonds and Si-O-Al bonds, the small units are connected with each other to form an aluminosilicate oligomer network to form a gel substance, the polymerization degree is further improved through the interlocking promotion of alkaline silicon oxide, the network structure is more compact, the strength is continuously increased, and therefore a firm filler is obtained. The invention not only effectively solves the problems of powder slag accumulation and pollution, but also can avoid the hidden danger of collapse caused by mining of mines, has multiple purposes, and is low in technological requirement and suitable for mines.

Inventors

  • FANG MINGWEI
  • LI RONGJIE
  • WANG DAN
  • Zhu Siao

Assignees

  • 呼伦贝尔学院

Dates

Publication Date
20260512
Application Date
20260202

Claims (10)

  1. 1. The coal mine powder slag grouting material is characterized by being prepared from the following raw materials in parts by weight: 70-80 parts of activated coal mine powder slag, 30-40 parts of aluminum ash aqueous solution, 17-25 parts of aggregate, 8-12 parts of plant fiber, 7-10 parts of silica sand, 2-2.5 parts of water reducer and 10-15 parts of mixing water; the activated coal mine powder slag is obtained by performing heat activation on the coal mine powder slag, and inert kaolinite minerals in the powder slag are converted into amorphous high-activity silicon oxide and aluminum oxide under the action of high temperature.
  2. 2. The coal mine dust grouting material of claim 1, wherein the preparation method of the activated coal mine dust comprises the following steps: The coal mine powder slag comprises a component with the grain diameter of less than or equal to 0.075mm, a component with the grain diameter of more than 0.075mm and less than or equal to 0.425mm, a component with the grain diameter of more than 0.425mm and less than or equal to 1.18mm, and a component with the grain diameter of more than 1.18mm and less than or equal to 2.75 mm; The mass ratio of the components with the particle size of less than or equal to 0.075mm, the components with the particle size of more than 0.075mm and less than or equal to 0.425mm, the components with the particle size of more than 0.425mm and less than or equal to 1.18mm, and the components with the particle size of more than 1.18mm and less than or equal to 2.75mm is 20-30:10-15:25-30:30-35; The temperature of the thermal activation is 600-700 ℃ and the time is 1.5-2.5 h.
  3. 3. The coal mine dust grouting material of claim 2, wherein the preparation method of the aluminum ash aqueous solution comprises the following steps: mixing aluminum ash and water to obtain an aluminum ash aqueous solution; the grain diameter of the aluminum ash is less than or equal to 0.2mm, and the mass ratio of the aluminum ash to the water is 1:8-12; The temperature of the mixing is 60-80 ℃, the time is 3-5 h, and the rotating speed is 200-300 rpm.
  4. 4. A coal mine dust grouting material according to claim 3, wherein the aggregate is granite rubble; the aggregate comprises components with the particle size of 3-3.75 mm and components with the particle size of 3.8-4.25 mm; The mass ratio of the components with the particle size of 3-3.75 mm to the components with the particle size of 3.8-4.25 mm is 1:1-1.5.
  5. 5. The coal mine powder slag grouting material of claim 4, wherein the preparation method of the plant fiber comprises the following steps: performing alkali treatment and coupling treatment on the large needle Mao Shunci to obtain the plant fiber; The length of the festuca arundinacea is 2-3.5 mm; The alkali treatment reagent is sodium hydroxide solution, the concentration of the sodium hydroxide solution is 2-2.5%, the temperature of the alkali treatment is 60-70 ℃ and the time is 50-60 min; The coupling treatment reagent is a coupling agent solution, the concentration of the coupling agent solution is 0.5-1%, and the coupling treatment time is 15-30 min; the specific surface area of the silica sand is more than or equal to 1300cm 2 /g; The water reducer is a polycarboxylate water reducer and/or a naphthalene water reducer.
  6. 6. The method for preparing the coal mine powder slag grouting material according to any one of claims 1 to 5, which is characterized by comprising the following steps: (1) Mixing activated coal mine powder slag, aggregate, plant fibers and silica sand to obtain a dry material; (2) Mixing the aluminum ash water solution and mixing water to obtain wet materials; (3) And mixing the dry material, the wet material and the water reducing agent to obtain the coal mine powder slag grouting material.
  7. 7. The method for preparing a grouting material for coal mine powder slag according to claim 6, wherein the mixing speed in the step (1) is 200-300 rpm, and the mixing time is 5-10 min.
  8. 8. The method for preparing a grouting material for coal mine powder slag according to claim 7, wherein the mixing time in the step (2) is 60-90 s.
  9. 9. The method for preparing a grouting material for coal mine powder slag according to claim 8, wherein the rotation speed of the mixing in the step (3) is 400-500 rpm, and the time is 2-3 min.
  10. 10. The use of the coal mine powder slag grouting material of any one of claims 1-5 in mine filling.

Description

Coal mine powder slag grouting material and preparation method and application thereof Technical Field The invention relates to the technical field of solid waste treatment, in particular to a coal mine powder slag grouting material and a preparation method and application thereof. Background Coal is an important resource for the development of modern society, the demand is expanded year by year, and the operation of basic industries such as electric power, steel, chemical industry and the like is supported. However, this head resource extraction process has led to a serious environmental problem-disposal of coal-based tailings has become a key bottleneck for sustainable development of mining. The coal-based tailings are necessary byproducts of coal washing and mining, and the tailings are directly piled around a coal mine because the coal content is extremely low and cannot be utilized, and have complex components and obvious environmental risks. When the mine tailings are stacked in the open air, a large amount of land is occupied, and along with the action of the environment, such as degradation of microorganisms, change of temperature and erosion of acid-base rainwater, the mine tailings are gradually decomposed to become coal mine powder slag, and secondary pollution is caused under the action of wind power or running water. Acid percolate is formed by leaching in rainy season, so that arsenic content of surrounding soil is seriously exceeded, cadmium concentration of underground water is increased rapidly, pollution halos with radius of several kilometers are formed, dust is formed by pollutants under the action of wind power, air quality is reduced, and the pollutants enter rivers and lakes through runoff under the action of running water, so that a three-dimensional pollution network of soil-water-food chain is formed. Therefore, how to treat the coal mine dust becomes a problem to be solved. Disclosure of Invention The invention aims to treat and utilize coal mine powder slag so as to overcome the problems in the prior art, and provides a coal mine powder slag grouting material, a preparation method and application thereof. In order to achieve the above object, the present invention provides the following technical solutions: The invention provides a coal mine powder slag grouting material which is prepared from the following raw materials in parts by mass: 70-80 parts of activated coal mine powder slag, 30-40 parts of aluminum ash aqueous solution, 17-25 parts of aggregate, 8-12 parts of plant fiber, 7-10 parts of silica sand, 2-2.5 parts of water reducer and 10-15 parts of mixing water. Preferably, the preparation method of the activated coal mine powder slag comprises the following steps: Carrying out heat activation on the coal mine powder slag to obtain activated coal mine powder slag; The coal mine powder slag comprises a component with the grain diameter of less than or equal to 0.075mm, a component with the grain diameter of more than 0.075mm and less than or equal to 0.425mm, a component with the grain diameter of more than 0.425mm and less than or equal to 1.18mm, and a component with the grain diameter of more than 1.18mm and less than or equal to 2.75 mm; The mass ratio of the components with the particle size of less than or equal to 0.075mm, the components with the particle size of more than 0.075mm and less than or equal to 0.425mm, the components with the particle size of more than 0.425mm and less than or equal to 1.18mm, and the components with the particle size of more than 1.18mm and less than or equal to 2.75mm is 20-30:10-15:25-30:30-35; The temperature of the thermal activation is 600-700 ℃ and the time is 1.5-2.5 h. Preferably, the preparation method of the aluminum ash aqueous solution comprises the following steps: mixing aluminum ash and water to obtain an aluminum ash aqueous solution; the grain diameter of the aluminum ash is less than or equal to 0.2mm, and the mass ratio of the aluminum ash to the water is 1:8-12; The temperature of the mixing is 60-80 ℃, the time is 3-5 h, and the rotating speed is 200-300 rpm. Preferably, the aggregate is granite gravels; the aggregate comprises components with the particle size of 3-3.75 mm and components with the particle size of 3.8-4.25 mm; The mass ratio of the components with the particle size of 3-3.75 mm to the components with the particle size of 3.8-4.25 mm is 1:1-1.5. Preferably, the preparation method of the plant fiber comprises the following steps: performing alkali treatment and coupling treatment on the large needle Mao Shunci to obtain the plant fiber; The length of the festuca arundinacea is 2-3.5 mm; The alkali treatment reagent is sodium hydroxide solution, the concentration of the sodium hydroxide solution is 2-2.5%, the temperature of the alkali treatment is 60-70 ℃ and the time is 50-60 min; The coupling treatment reagent is a coupling agent solution, the concentration of the coupling agent solution is 0.5-1%,