阅读说明：本技术 水滑石激发粉煤灰早强型矿用封孔材料 (Hydrotalcite-excited coal ash early-strength mining hole sealing material ) 是由 吉小利 刘健 唐田甜 马梦晓 钱亮 于 2019-09-29 设计创作，主要内容包括：本发明公开了一种水滑石激发粉煤灰早强型矿用封孔材料,该封孔材料以重量份计,包含以下组分：水滑石类早强组分10-50份、有机物类早强组分1-6份、减水组分1-8份、粉煤灰组分150-200份、水泥熟料700-1000份、水300-500份。所述的早强型矿用封孔材料的制备工艺为：按配比将各组分混合,搅拌均匀后即得到产品。本发明封孔材料早强效果突出,1天抗压强度16.71MPa,3天抗压强度25.10MPa,流动度大于200mm,凝结时间小于500min,在提高封孔材料早期强度的情况不影响其工作性能,完全满足矿井瓦斯抽采和深孔爆破的使用要求,对于深孔爆破技术能缩短等待时间,更能满足安全可靠的需求。且该封孔材料可以在井下现场配制应用,方便快捷,无毒无污染。(The invention discloses a hydrotalcite-excited coal ash early-strength mine hole sealing material which comprises the following components in parts by weight: 10-50 parts of hydrotalcite early strength component, 1-6 parts of organic matter early strength component, 1-8 parts of water reducing component, 150 parts of fly ash component, 1000 parts of cement clinker and 500 parts of water. The preparation process of the early-strength mining hole sealing material comprises the following steps: the components are mixed according to the proportion and stirred evenly to obtain the product. The hole sealing material has an outstanding early strength effect, the 1-day compressive strength is 16.71MPa, the 3-day compressive strength is 25.10MPa, the fluidity is greater than 200mm, the setting time is less than 500min, the working performance of the hole sealing material is not influenced under the condition of improving the early strength of the hole sealing material, the use requirements of mine gas extraction and deep hole blasting are completely met, the waiting time can be shortened for the deep hole blasting technology, and the requirements of safety and reliability can be better met. And the hole sealing material can be prepared and applied in the underground field, is convenient and quick, and is non-toxic and pollution-free.)

1. A hydrotalcite-excited coal ash early-strength mining hole sealing material is characterized in that: comprises the following raw materials in percentage by weight: 10-50 parts of hydrotalcite early strength component, 1-6 parts of organic matter early strength component, 1-8 parts of water reducing component, 150 parts of fly ash component, 1000 parts of cement clinker and 500 parts of water.

2. The hydrotalcite-excited fly ash early-strength mining hole sealing material according to claim 1, which is characterized in that: the organic early-strength component is one or more of triethanolamine, triisopropanolamine and glycerol.

3. The hydrotalcite-excited fly ash early-strength mining hole sealing material according to claim 1, which is characterized in that: the water reducing component is one or more of naphthalene sulfonic acid series, polycarboxylic acid series and melamine series high-efficiency water reducing agents.

4. The hydrotalcite-excited fly ash early-strength mining hole sealing material according to claim 1, which is characterized in that: the hydrotalcite is calcium-aluminum hydrotalcite.

5. The hydrotalcite-excited fly ash early-strength mining hole sealing material according to claim 4, characterized in that: the calcium-aluminum hydrotalcite comprises aluminum chloride, calcium chloride and sodium hydroxide;

preferably, the mass ratio of the calcium chloride, the aluminum chloride and the sodium hydroxide is 2:1: 7.

6. The hydrotalcite-excited fly ash early-strength mining hole sealing material according to claim 5, characterized in that: the preparation method of the calcium-aluminum hydrotalcite comprises the following steps:

s1: dissolving calcium chloride and aluminum chloride in an ethanol-water solution to obtain a solution A;

s2: dissolving sodium hydroxide powder in an ethanol-water solution to obtain a solution B;

s3: mixing the solution A and the solution B, adding the mixture into a stainless steel autoclave with polytetrafluoroethylene as a lining, standing the mixture for 20 to 30 hours at the temperature of between 70 and 80 ℃, filtering, washing, drying and grinding the mixture to obtain the finished product.

7. The hydrotalcite-excited fly ash early-strength mining hole sealing material according to claim 6, which is characterized in that: the volume ratio of ethanol to water in the ethanol water solution is 1:4, the mass volume ratio of calcium chloride, aluminum chloride and the ethanol-water solution in the solution A is 70-80mg:40-50mg:1ml, and the mass volume ratio of sodium hydroxide to the ethanol-water solution in the solution B is 90-95mg:1 ml.

8. The hydrotalcite-excited fly ash early-strength mining hole sealing material as claimed in any one of claims 1 to 7, wherein: when in use, the components are mixed according to the proportion, and the finished product can be obtained after uniform stirring and dispersion.

9. The hydrotalcite-excited fly ash early-strength mining hole sealing material as claimed in any one of claims 1 to 7, wherein: the hole sealing material can be used for sealing a drilled hole in coal mine gas or deep hole blasting, and can also be used for plugging a hole.

Technical Field

The invention relates to the technical field of coal mine gas extraction drilling and hole sealing materials, in particular to a hydrotalcite-excited coal ash early-strength type mining hole sealing material.

Background

Coal is a main energy source in China, however, various disaster accidents are often caused in the process of mining, and gas outburst is the most outstanding problem, and the safety mining of coal mines is severely restricted. The drilling extraction is a basic means for coal mine gas control, the drilling needs to be sealed after the drilling is finished by the technology, the hole sealing effect of hole sealing materials is particularly important, and the gas drainage effect is seriously influenced.

At present, the direct hole sealing technology for measuring the gas pressure of a coal seam and extracting a drilled hole adopts organic materials or inorganic materials for sealing, and comprises the steps of clay manual sealing, mechanical water injection mortar sealing and foaming polymer material sealing. The clay hole sealing method is short in hole sealing length, yellow mud can become soft when meeting water, and the strength cannot meet the hole sealing requirement; the mechanical water injection mortar hole sealing cement has the defects of low setting speed, large volume self-shrinkage, serious water bleeding phenomenon, complex coal mine environment and increasingly deepened mining depth, and the cement-based hole sealing material can cause that the early strength can not meet the requirements of coal bed permeability increase and gas extraction due to the underground high-temperature, high-humidity and high-corrosivity environment.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, one purpose of the invention is to provide a hydrotalcite-excited coal ash early-strength type mining hole sealing material, which can greatly improve the early strength of the hole sealing material, so as to solve the problems that the current hole sealing material cannot meet the use requirement in the early strength, has long coagulation time, is not easy to control the hole sealing length, has high cost and the like, and improve the hole sealing efficiency and success rate; because the preparation process is simple and the operation is simple and convenient, the invention also solves the problem that the direct batching can not be carried out on site; and the selected materials have low price, no toxicity, environmental protection and no pollution.

According to the hole sealing material for the hydrotalcite-excited coal ash early-strength type mine, the hole sealing material comprises a hydrotalcite-like early-strength component, an organic early-strength component, a water reducing component and coal ash, and the balance of cement.

Preferably, the composition comprises the following components in parts by weight:

10-50 parts of hydrotalcite early strength component, 1-6 parts of organic matter early strength component, 1-8 parts of water reducing component, 150 parts of fly ash component, 1000 parts of cement clinker and 500 parts of water.

Preferably, the organic early-strength component is one or more of triethanolamine, triisopropanolamine and glycerol.

Preferably, the water reducing component is one or more of naphthalene sulfonic acid-based, polycarboxylic acid-based and melamine-based superplasticizers.

Preferably, the hydrotalcite is calcium-aluminum hydrotalcite.

Preferably, the calcium-aluminum hydrotalcite comprises aluminum chloride, calcium chloride and sodium hydroxide.

Preferably, the mass ratio of the calcium chloride, the aluminum chloride and the sodium hydroxide is 2:1: 7.

Preferably, the preparation method of the calcium-aluminum hydrotalcite comprises the following steps:

s1: dissolving calcium chloride and aluminum chloride in an ethanol-water solution to obtain a solution A;

s2: dissolving sodium hydroxide powder in an ethanol-water solution to obtain a solution B;

s3: mixing the solution A and the solution B, adding the mixture into a stainless steel autoclave with polytetrafluoroethylene as a lining, standing the mixture for 20 to 30 hours at the temperature of between 70 and 80 ℃, filtering, washing, drying and grinding the mixture to obtain the finished product.

Preferably, the volume ratio of ethanol to water in the ethanol aqueous solution is 1:4, the mass volume ratio of calcium chloride, aluminum chloride and the ethanol-aqueous solution in the solution A is 70-80mg:40-50mg:1ml, and the mass volume ratio of sodium hydroxide to the ethanol-aqueous solution in the solution B is 90-95mg:1 ml.

When the hydrotalcite-excited fly ash early-strength mine hole sealing material is used, all components are mixed according to a ratio, and a finished product can be obtained after the components are uniformly stirred and dispersed.

The hydrotalcite-excited fly ash early-strength type mining hole sealing material provided by the invention can be used for sealing drilled holes in coal mine gas or deep hole blasting, and can also be used for plugging other related holes.

The action mechanism is as follows:

the fly ash is mostly in a closed and firm spherical shape, and the inner surface area and the monomolecular adsorbed water are small, so that the cement has the characteristics of good workability, small drying shrinkage, high tensile strength and good crack resistance; the alkalinity of the hydrotalcite can promote the coal ash to be depolymerized and release the active ingredient SiO₂And Al₂O₃And Ca (OH)₂Reacting to form calcium silicate hydrate with low solubility to make Ca²⁺And OH^-The cement-based grouting material is easier to release into liquid from a protective film formed by a hydration product generated in the early stage, the decomposition rate of dicalcium silicate and tricalcium silicate in clinker is improved, the growth of ettringite crystals is promoted, the hydration reaction process is accelerated, and the early strength of the cement-based grouting material is improved to a great extent; the hydrotalcite and the fly ash can be filled in pores in a cement net structure, so that the compactness of the cement structure is increased, and the early strength of the cement-based grouting material is improved; the early strength is improved, so that the supporting effect of the hole sealing material on the drill hole is improved; all the components of the material are from the materials sold in the market, the source is wide, the price is low, the environment is protected, no pollution is caused, the production cost is reduced, and the purpose of the invention is achieved.

Advantageous effects

The calcium-aluminum hydrotalcite is prepared by mixing and evenly mixing aluminum chloride, calcium chloride and sodium hydroxide according to the molar mass ratio of 2:1:7, standing for 20-30 hours at the temperature of 70-80 ℃, filtering, washing, drying and grinding. The aluminum chloride and the calcium chloride are adopted because the aluminum chloride and the calcium chloride can react with the fly ash to form hydrated chloroaluminate as chloride saltThe calcium chloride can supplement calcium for the fly ash, so that the calcium-silicon ratio in the fly ash is improved; sodium hydroxide is adopted because it is strong alkali, while the main chemical component of the fly ash is acidic oxide, which is weakly acidic and is in alkaline environment (in OH)^-Under the action of the silicon-oxygen-silicon-aluminum oxide powder, Si-O and Al-O bonds on the surfaces of fly ash particles are broken, the hard and compact glass body structure and the surface of the fly ash are damaged, and the silicon-oxygen and silicon-oxygen-aluminum network structure is damaged, so that the activity of the fly ash is excited.

The invention has outstanding early strength effect, the 1-day compressive strength is 16.71MPa, the 3-day compressive strength is 25.10MPa, the fluidity is more than 200mm, the setting time is less than 500min, the requirement that the working performance of the hole sealing material is not influenced under the condition of improving the early strength of the hole sealing material is better met, and the use requirements of mine gas extraction and deep hole blasting are completely met.

The material has good pumping performance, does not prolong the setting time (the setting time is less than 500min), can be prepared and applied on the underground site due to easy acquisition, convenient transportation and simple preparation, is convenient and quick, and is nontoxic and pollution-free.

Drawings

FIG. 1 is an XRD spectrum of Ca-Al-Cl LDHs proposed by the present invention;

FIG. 2 is a SEM image of Ca-Al-Cl LDHs proposed by the present invention;

FIG. 3 is an XRD (X-ray diffraction) diagram of the hydrotalcite-excited coal ash cement hole sealing material for the mine after hydration for 1 day;

FIG. 4 is an SEM image of the hydrotalcite-excited coal ash cement hole sealing material for 1 day hydration.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.