Method for resource utilization of tailings slurry in paste filling of coal mine

Abstract

The present invention relates to the technical field of coal mine paste filling, and particularly to a method for the resource utilization of the tail slurry of coal mine paste filling: specifically including the following steps: Step 1: Collect and stir the excess filling slurry discharged from the filling area; Step 2: After the support of the next filling goaf working face is completed, measure the mass concentration of the filling slurry in Step 1; Step 3: According to the mass concentration data in Step 2, when the mass concentration is less than 50% or greater than 80%, add an activator to the filling slurry through an adding device; Step 4: Stir the activator evenly in the filling slurry to carry out modification; Step 5: Fill the modified filling slurry in Step 4 into the new next filling goaf through a pipeline; Through this method, the tail slurry of coal mine paste filling can be collected and reused, and the activator is used to ensure that its activity meets the use requirements, meeting the requirements of the existing environment-friendly and resource-saving society.

Description

Technical Field:

[0001] The present invention relates to the technical field of coal mine paste filling, and particularly to a method for recycling the tail slurry of coal mine paste filling. Background Art:

[0002] As one of the coal mine green mining technology systems, the main purpose of the fully-mechanized caving paste filling technology is to solve the problem of coal pressing under "three under one over", treat mine solid waste coal gangue and mine water, improve the coal resource recovery rate, and extend the mine service life.

[0003] At present, in the application process of the coal mine fully-mechanized caving paste filling technology, at the end of the filling operation, due to the inability to accurately measure the volume of the goaf, in order to ensure the filling rate of the goaf, the total amount of the prepared filling slurry is often greater than the filling amount of the goaf when preparing the filling slurry. Therefore, the excess filling slurry is discharged into the sedimentation tank outside the working face, resulting in waste of resources; correspondingly, the workload of cleaning the sedimentation tank is large, and the waste materials after cleaning are transported to the surface for discharge, causing environmental pollution. Therefore, the secondary resource utilization of the tail slurry of the fully-mechanized caving paste filling technology has become an urgent problem to be solved by those skilled in the art.

[0004] After our company found the above problems, a special research group was established to find a solution to the above problems. However, when the paste slurry reaches the initial setting time after being placed for a corresponding time, it cannot meet the requirements; if continuously stirred, the initial setting time can be slowed down, but the paste will segregate; if corresponding retarders, water reducers and other additives are added, it cannot avoid segregation, precipitation and bleeding after a long time of waiting, and the tail slurry of the coal mine paste filling must be discarded; while ensuring its fluidity, ensuring that it does not bleed water, segregate and precipitate, and the material has good distribution, and the mass concentration is in a reasonable range is an urgent problem to be solved. Summary of the Invention:

[0005] A method for recycling the tail slurry of coal mine paste filling specifically includes the following steps:

[0006] Step 1: Collect and stir the excess filling slurry discharged from the filling area.

[0007] Step 2: After the support of the next filling goaf working face is completed, measure the mass concentration of the filling slurry in Step 1.

[0008] Step 3: According to the mass concentration data in Step 2, when the mass concentration is less than 50% or greater than 80%, add an activator to the filling slurry through an adding device.

[0009] Step 4: Stir the activator evenly in the filling slurry for modification.

[0010] Step 5: Fill the modified filling slurry in Step 4 into the next new filling goaf by using a pipeline.

[0011] Further, the activator comprises the following components and mass fractions: sodium methylene bis(naphthalene sulfonate) 40%-67%, sodium sulfate 20%-40%, sodium chloride 5%-13%, sodium oxide 5%-11%, and aluminum oxide 3%-18%.

[0012] Further, the activator consists of the following components and mass fractions:

[0013]

[0014] Further, the activator consists of the following components and mass fractions:

[0015]

[0016] Further, the activator consists of the following components and mass fractions:

[0017]

[0018]

[0019] Further, the activator consists of the following components and mass fractions:

[0020]

[0021] The beneficial effects of the present invention are as follows: Through this method, the tail slurry of coal mine paste filling can be collected and reused, and the activator can ensure that its activity meets the usage requirements, meeting the requirements of the existing environment-friendly and resource-saving society; this activator can reduce the bleeding of paste slurry, decrease the slump, prevent precipitation, and shorten the initial setting time during the waiting process. Specific implementation method:

[0022] To make the purpose, technical solution, and advantages of the implementation of the present invention clearer, the following embodiments are now used to further describe the present invention in detail, so that the public can better master the implementation method of the present invention. The specific implementation plan of the present invention is as follows:

[0023] The method for resource utilization of tail slurry for coal mine paste filling specifically includes the following steps:

[0024] Step 1: Collect and stir the excess filling slurry discharged from the filling area.

[0025] Step 2: After the support of the next filling goaf working face is completed, measure the mass concentration of the filling slurry in Step 1. The components in the qualified paste slurry are a uniformly dispersed system, and the mass concentration is an important index for judging the balance performance of the paste slurry.

[0026] Step 3: According to the mass concentration data in Step 2, when the mass concentration is less than 50% or greater than 80%, an activator is added to the filling slurry through an adding device;

[0027] Step 4: Stir the activator evenly in the filling slurry for modification;

[0028] Step 5: Fill the modified filling slurry in Step 4 into the next new filling goaf through a pipeline.

[0029] Through this method, the tail slurry of coal mine paste filling can be collected and reused, and the collected filling tail slurry can be ensured not to segregate, bleed water, or precipitate by the activator, meeting the activity requirements and conforming to the requirements of the existing environment-friendly and resource-saving society.

[0030] The activator includes the following components and mass fractions, which are further elaborated through the following examples:

[0031] Example A, the activator in this example consists of the following components and mass fractions:

[0032]

[0033]

[0034]

[0035] Comparative Example 1, the components of the activator in this comparative example are basically the same as those in Example A, except that aluminum oxide is not added.

[0036]

[0037] Example B, the activator in this example consists of the following components and mass fractions:

[0038]

[0039]

[0040]

[0041] Comparative Example 2, the components of the activator in this comparative example are basically the same as those in Example B, except that sodium sulfate is not added.

[0042]

[0043] Example C, the activator in this example consists of the following components and mass fractions:

[0044]

[0045]

[0046]

[0047] Comparative Example 3. The activator composition of this comparative example is basically the same as that of Example C, except that sodium chloride is not added.

[0048]

[0049] Example D. The activator of this example consists of the following components and mass fractions:

[0050]

[0051]

[0052]

[0053] Comparative Example 4. The activator composition of this comparative example is basically the same as that of Example C, except that sodium oxide is not added.

[0054]

[0055] Through the data analysis of the charts of the examples and comparative examples, while balancing the slump, consistency, bleeding rate, and initial setting time, the final setting time is greatly shortened, saving time for demolding and accelerating the construction progress.

Claims

1. Method for resource utilization of tail slurry in paste filling of coal mines, characterized in that: Specifically, it includes the following steps: Step 1: Collect and stir the excess filling slurry discharged from the filling area; Step 2: After the support of the next filling goaf working face is completed, measure the mass concentration of the filling slurry in Step 1; Step 3: According to the mass concentration data in Step 2, when the mass concentration is less than 50% or greater than 80%, add an activator to the filling slurry through an adding device. The activator includes the following components and mass fractions: sodium methylene bisnaphthalene sulfonate 40%-67%, sodium sulfate 20%-40%, sodium chloride 5%-13%, sodium oxide 5%-11%, aluminum oxide 3%-18%; Step 4: Stir the activator evenly in the filling slurry for modification; Step 5: Use a pipeline to fill the modified filling slurry in Step 4 into the next new filling goaf.

2. The method for resource utilization of tail slurry in paste filling of coal mines according to claim 1, characterized in that, The activator consists of the following components and mass fractions:

3. The method for resource utilization of tail slurry in paste filling of coal mines according to claim 1, characterized in that, The activator consists of the following components and mass fractions:

4. The method for resource utilization of tail slurry in paste filling of coal mines according to claim 1, characterized in that, The activator consists of the following components and mass fractions:

5. The method for resource utilization of tail slurry in paste filling of coal mines according to claim 1, characterized in that, The activator consists of the following components and mass fractions:

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