CN114542176A - Gangue suspension filling slurry for mine and preparation method thereof - Google Patents

Abstract

The invention provides a gangue suspension filling slurry for mines and a preparation method thereof, comprising gangue, fine particle waste, admixture and water. The mass fractions of gangue, fine particle waste, admixtures and water are: 72‑76%, 1‑3%, 1‑5‰ and 27‑21%, respectively. The gangue suspension filling slurry for mines and the preparation method thereof provided by the invention have the following advantages: the gangue particle size of the filling slurry is small, the gangue has good suspendability, and the gangue particles do not settle within two hours of standing, which is easy to stop the mine Restart after pumping operation; filling slurry pipeline conveying resistance is small, the conveying process is stable, and has good flow performance; filling slurry is suitable for mines where gangue is urgent to deal with and has low requirements on the strength of filling body; filling slurry The utilization rate of gangue is high, it can deal with gangue quickly and efficiently, and compared with cemented filling, the filling cost is halved; the slurry is filled to the goaf, the bleeding rate is low, no need for separate dehydration, and the density is high, which can be better. Control surface subsidence.

Description

A kind of gangue suspension filling slurry for mine and preparation method thereof

technical field

The invention relates to the technical field of mine filling materials, in particular to a mine gangue suspension filling slurry and a preparation method thereof.

Background technique

With the mining of coal resources, a large amount of coal gangue solid waste will be produced in the process of excavation and washing. The annual output of coal gangue in my country is huge, and the untreated coal gangue accumulated over the years has reached more than 8.5 billion tons. At present, there are thousands of large-scale coal gangue mountains, occupying a lot of land resources. At the same time, in recent years, the annual untreated coal gangue in my country has exceeded 700 million tons. Coal gangue contains certain harmful components, which accumulate on the surface and cause serious pollution to the atmosphere, soil and groundwater. Therefore, the disposal of a large amount of coal gangue is imminent.

At present, the main treatment method of coal gangue is goaf filling. Filling the gob with coal gangue not only consumes the waste coal gangue, but also can control the surface subsidence of the goaf to a certain extent. It is a green and environmentally friendly mining method. At present, the mine filling methods for coal gangue treatment are gangue-fly ash dry filling and gangue-fly ash cement slurry filling. The former filling material has low compactness and is not effective in controlling rock formation movement and surface subsidence. The latter has good integrity and stability, high roof connection rate, high strength, and can effectively control surface subsidence, which is the main trend of goaf filling in the future. and development direction. However, because the latter cement and fly ash account for about 30% of the filling material, the filling cost is high, which restricts the large-scale promotion of this method in mines. At the same time, the proportion of gangue in the filling material is less than 50%, and the treatment rate of gangue is low. .

SUMMARY OF THE INVENTION

The embodiments of the present invention provide a mine gangue suspension filling slurry and a preparation method thereof, which are used to solve the problems existing in the prior art.

In order to achieve the above objects, the present invention adopts the following technical solutions.

A kind of gangue suspension filling slurry for mine, comprising gangue, fine particle waste, admixture and water; the mass fractions of gangue, fine particle waste, admixture and water are: 72-76%, 1-3%, 1- 5‰ and 27-21%.

Preferably, the maximum particle size of the gangue is in the range of 2-8 mm; the fine particle waste includes fly ash in the particle size range of 1-300 μm.

Preferably, the admixture includes hydroxypropyl starch ether.

In a second aspect, the present invention provides a method for preparing mine gangue suspension filling slurry, comprising:

Mixing broken gangue and fine-grained waste to obtain mixed raw materials;

The mixed raw materials are stirred, and water and additives are added in the stirring operation to obtain gangue suspension filling slurry;

The mass fractions of gangue, fine particle waste, admixture and water in the gangue suspension filling slurry are: 72-76%, 1-3%, 1-5‰ and 27-21%, respectively.

It can be seen from the technical solutions provided by the above embodiments of the present invention that the present invention provides a gangue suspension filling slurry for mines and a preparation method thereof, including gangue, fine particle waste, admixture and water. The mass fractions of gangue, fine particle waste, admixture and water are: 72-76%, 1-3%, 1-5‰ and 27-21%, respectively. The mine gangue suspension filling slurry and its preparation method provided by the present invention have the following advantages:

The gangue particle size of the filling slurry is small, the gangue has good suspension, and the gangue particles do not settle within two hours of standing, which is easy for the mine to restart after the pumping operation is suspended;

The filling slurry pipeline has small conveying resistance, stable conveying process and good flow performance;

Filling slurry is suitable for mines where the gangue is urgent to be treated and the strength of the filling body is low;

Filling slurry has high utilization rate of gangue, can deal with gangue quickly and efficiently, and compared with cemented filling, the filling cost is halved; the slurry is filled to the goaf, with low bleeding rate, no need for separate dehydration, and high density, can Better control of surface subsidence.

Additional aspects and advantages of the present invention will be set forth in part in the following description, which will be apparent from the following description, or may be learned by practice of the present invention.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

Fig. 1 is a schematic diagram of the relationship between the particle size of gangue and the cost of crushing of a gangue suspension filling slurry for mines provided by the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but not to be construed as a limitation of the present invention.

It will be understood by those skilled in the art that the singular forms "a", "an", "the" and "the" as used herein can include the plural forms as well, unless expressly stated otherwise. It should be further understood that the word "comprising" used in the description of the present invention refers to the presence of stated features, integers, steps, operations, elements and/or components, but does not exclude the presence or addition of one or more other features, Integers, steps, operations, elements, components and/or groups thereof. It will be understood that when we refer to an element as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Furthermore, "connected" or "coupled" as used herein may include wirelessly connected or coupled. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with their meanings in the context of the prior art and, unless defined as herein, are not to be taken in an idealized or overly formal sense. explain.

In order to facilitate the understanding of the embodiments of the present invention, the following will take several specific embodiments as examples for further explanation and description in conjunction with the accompanying drawings, and each embodiment does not constitute a limitation to the embodiments of the present invention.

The invention provides a gangue suspension filling slurry for mines and a preparation method thereof, which are used to solve the problems of high filling cost and low utilization rate of gangue in the current goaf filling process.

The invention provides a gangue suspension filling slurry for mines, which comprises gangue, fine particle waste, admixture and water. The mass fractions of gangue, fine particle waste, admixture and water are: 72-76%, 1-3%, 1-5‰ and 27-21%, respectively.

In the preferred embodiment provided by the present invention, the purpose of adding the admixture is to suspend the gangue, and the overall homogeneity of the slurry is good, which is more conducive to the transportation of the slurry. If no admixture is added, the gangue particles will settle, which will increase the conveying resistance. At the same time, during the suspension of slurry pumping, if the gangue settles, the resistance of the slurry pipeline will be too large, and the pumping process cannot be restarted. This leads to the occurrence of pipe blockage and causes huge economic losses to the mine. The admixture can be a regulator such as hydroxypropyl starch ether. Secondly, adding too much admixture will cause the viscosity of the slurry to increase, which is not conducive to pipeline transportation. Therefore, the admixture mass fraction range is set as 1-5‰.

Further, in the preferred embodiment provided by the present invention, the maximum particle size of the gangue is 2-8 mm, and the fine-particle waste is fine-particle waste such as fly ash with a particle size in the range of 1-300 μm. The particle size of the gangue is related to the performance and cost of the slurry. If the particle size of the gangue is too large, the maximum particle size is greater than 8mm, which will cause the gangue to settle. If the particle size is too small, the crushing cost will be too high. related to crushing costs. Therefore, the maximum particle size range of gangue is set as 2-8mm.

In a second aspect, the present invention provides a method for preparing the above-mentioned mine gangue suspension filling slurry, including the following processes:

Mixing broken gangue and fine-grained waste to obtain mixed raw materials;

The mixed raw materials are stirred, and water and additives are added in the stirring operation to obtain gangue suspension filling slurry;

The mass fractions of gangue, fine particle waste, admixture and water in the gangue suspension filling slurry are: 72-76%, 1-3%, 1-5‰ and 27-21%, respectively.

The prepared gangue suspension filling slurry is sent into the well for filling operation.

The present invention also provides the following multiple examples for showing the performance test of the gangue suspension filling slurry provided by the present invention.

Example 1

Crush the gangue to a maximum particle size of 8mm, dissolve the hydroxypropyl starch ether in water to prepare a regulator gel liquid, mix the gangue, fly ash, regulator and water according to 72%, 3%, 5‰ and 25%. The proportions are mixed evenly, the viscosity of the formed slurry is 6.30Pa·s, the bleeding rate is 0.70%, the flow performance is good, and the gangue does not settle within two hours.

Example 2

The gangue is crushed to a maximum particle size of 5mm, and the hydroxypropyl starch ether is dissolved in water to prepare a regulator gel liquid. The proportions are mixed evenly, the viscosity of the formed slurry is 5.74Pa·s, the bleeding rate is 0.92%, the flow performance is good, and the gangue does not settle within two hours.

Example 3

The gangue is crushed to a maximum particle size of 2mm, and the hydroxypropyl starch ether is dissolved in water to prepare a regulator gel liquid. The ratio is mixed evenly, the viscosity of the formed slurry is 5.23Pa·s, the bleeding rate is 1.03%, the flow performance is excellent, and the gangue does not settle within two hours.

In summary, the present invention provides a gangue suspension filling slurry for mining and a preparation method thereof, comprising gangue, fine particle waste, admixture and water. The mass fractions of gangue, fine particle waste, admixture and water are: 72-76%, 1-3%, 1-5‰ and 27-21%, respectively. The mine gangue suspension filling slurry and its preparation method provided by the present invention have the following advantages:

The gangue particle size of the filling slurry is small, the gangue has good suspension, and the gangue particles do not settle within two hours of standing, which is easy for the mine to restart after the pumping operation is suspended;

The filling slurry pipeline has small conveying resistance, stable conveying process and good flow performance;

Filling slurry is suitable for mines where the gangue is urgent to be treated and the strength of the filling body is low;

Filling slurry has high utilization rate of gangue, can deal with gangue quickly and efficiently, and compared with cemented filling, the filling cost is halved; the slurry is filled to the goaf, with low bleeding rate, no need for separate dehydration, and high density, can Better control of surface subsidence.

Those of ordinary skill in the art can understand that the accompanying drawing is only a schematic diagram of an embodiment, and the modules or processes in the accompanying drawing are not necessarily necessary to implement the present invention.

From the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general hardware platform. Based on this understanding, the technical solutions of the present invention can be embodied in the form of software products in essence or the parts that make contributions to the prior art. The computer software products can be stored in storage media, such as ROM/RAM, magnetic disks, etc. , CD, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of the present invention.

Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the various embodiments may be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the apparatus or system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and reference may be made to some descriptions of the method embodiments for related parts. The apparatus and system embodiments described above are only illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, It can be located in one place, or it can be distributed over multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution in this embodiment. Those of ordinary skill in the art can understand and implement it without creative effort.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (4)

1. a gangue suspension filling slurry for mining, is characterized in that, comprises gangue, fine particle waste, admixture and water; The mass fractions of described gangue, fine particle waste, admixture and water are respectively: 72-76% , 1-3%, 1-5‰ and 27-21%. 2. The gangue suspension filling slurry for mine use according to claim 1, wherein the maximum particle size of the gangue is 2-8mm; Ash. 3 . The gangue suspension filling slurry for mines according to claim 1 , wherein the admixture comprises hydroxypropyl starch ether. 4 . 4. a preparation method of mine gangue suspension filling slurry, is characterized in that, comprises: Mixing broken gangue and fine-grained waste to obtain mixed raw materials; Carrying out a stirring operation on the mixed raw materials, and adding water and an admixture in the stirring operation to obtain the gangue suspension filling slurry; The mass fractions of gangue, fine particle waste, admixture and water in the gangue suspension filling slurry are respectively 72-76%, 1-3%, 1-5‰ and 27-21%.

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