Non-corrosive liquid setting accelerator used in coal mine paste filling, and preparation method thereof

A paste filling and quick-setting agent technology, applied in the field of liquid accelerators, can solve the problems that the paste cannot fill the goaf by itself, the storage stability of the accelerator is not good, and the work of adding the accelerator is inconvenient, etc., to achieve Overcoming the effects of ultra-short setting time, mature filling technology, and improved filling efficiency of paste

Inactive Publication Date: 2015-09-16
XUZHOU CUMT BACKFILL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, similar to shotcrete, the paste material with accelerator added at the outlet of the pipeline loses fluidity due to rapid coagulation, resulting in the paste not being able to fill the goaf by itself
Secondly, most of the liquid accelerators currently on the market are highly corrosive, that is, PH ≤ 2.0 or PH ≥ 12.5, which are easy to cause harm to the human body during transportation and use.
Furthermore, the storage stability of the accelerator is not good, and precipitation and stratification are prone to occur, which brings a lot of inconvenience to the addition of the accelerator

Method used

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  • Non-corrosive liquid setting accelerator used in coal mine paste filling, and preparation method thereof
  • Non-corrosive liquid setting accelerator used in coal mine paste filling, and preparation method thereof

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preparation example Construction

[0034] The preparation method of paste quick-setting agent comprises the following steps:

[0035] 1) Modification of liquid sodium aluminate: add 5-15% sodium carbonate to water to prepare a modifier, add sodium aluminate with an alumina content of 20-30wt% to the modifier, sodium aluminate and modified The mass ratio of the active agent is 12:1~5:1.

[0036] 2) The reaction between modified sodium aluminate and aluminum sulfate: add the modified liquid sodium aluminate prepared in step 1) dropwise to the aluminum sulfate solution with an alumina content of 12-16% to obtain a stable solution; The mass ratio of liquid sodium aluminate to aluminum sulfate solution is 1:2~1:4;

[0037] 3) Add 0.5~2% alcohol amine, stir evenly;

[0038] 4) Add 5~10% plasticizer and stir evenly to get the finished product.

[0039] In the step 1), the whole process of sodium aluminate modification needs to be carried out in not less than 1000S -1 It is carried out under high-shear stirring and...

Embodiment 1

[0049] 1. Liquid sodium aluminate modification: under high shear stirring (1000S -1 ) state slowly add 50 parts of liquid sodium aluminate to 10 parts of 5% sodium carbonate. When the gel appears, add 25 parts of water, continue to add the remaining liquid sodium aluminate solution after the gel is dissolved, and continue to react for 1 hour to obtain modified liquid sodium aluminate L-1

[0050] 2. Reaction of modified sodium aluminate and aluminum sulfate: under high shear stirring (3000 S -1 ) state, slowly drop 100 parts of L-1 into 200 parts of aluminum sulfate solution with an alumina content of 16%, to prevent the formed aluminum hydroxide gel from agglomerating and agglomerating. The dropwise addition time was 30 minutes, and the temperature was controlled at about 20°C. After the dropwise addition was completed, the solution was slowly heated to 60°C and kept for 1 hour to obtain a yellow transparent liquid S-1.

[0051] Three, the deployment of accelerator:

[005...

Embodiment 2

[0060] 1. Liquid sodium aluminate modification: under high shear stirring (1500S -1 ) state slowly add 80 parts of liquid sodium aluminate to 10 parts of 15% sodium carbonate. When the gel appears, add 25 parts of water, continue to add the remaining liquid sodium aluminate solution after the gel is dissolved, and continue to react for 2 hours to obtain modified liquid sodium aluminate L-2;

[0061] 2. Reaction of modified sodium aluminate and aluminum sulfate: under high shear stirring (4000 S -1 ) state, slowly drop 100 parts of L-2 into 400 parts of aluminum sulfate solution with an alumina content of 12%, to prevent the formed aluminum hydroxide gel from agglomerating and agglomerating. The dropwise addition time is 60 minutes, and the temperature is controlled at about 40°C. After the dropwise addition is completed, the solution is slowly heated to 80°C and kept for 2 hours to obtain a yellow transparent liquid S-2.

[0062] 3. Preparation of quick-setting agent: Add tr...

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Abstract

The invention relates to a non-corrosive liquid setting accelerator used in coal mine paste filling, and a preparation method thereof. The invention relates to a liquid setting accelerator and the preparation method thereof. The paste filling non-corrosive liquid setting accelerator has a pH value of 3-5 and a density of 1.4g/cm<3>, and is weakly acidic. A paste filling material with the setting accelerator can maintain fluidity with the time range of 15-45min, and has strength higher than 0.1MPa after 2h. The storage period of the setting accelerator is 6 months. The paste setting accelerator is composed of sodium aluminate, sodium carbonate, aluminum sulfate, alkanolamine and a plasticizer. The preparation process of the setting accelerator comprises sodium aluminate modification, modified sodium aluminate and aluminum sulfate reaction, and alkanolamine substance and plasticizer introduction. With the setting accelerator, problems of excessively short setting time, uncontrollable flow time, high corrosivity and poor storage stability of a common setting accelerator used in coal mine waste filling mining application are overcome; paste filling efficiency is greatly improved; and the filling technology is more mature. The setting accelerator assists in promoting the development of the coal mine waste filling mining technology to a certain extent.

Description

technical field [0001] The invention relates to a liquid quick-setting agent, in particular to a non-corrosive liquid quick-setting agent for coal mine paste filling and a preparation method thereof. Background technique [0002] Paste filling mining is to process solid waste such as coal gangue, fly ash, low-quality soil, and urban garbage near the coal mine into a paste-like slurry with no critical flow rate and no dehydration, and use pump pressure and self-weight to transport it through pipelines Go underground and timely fill the mining method of the goaf. At present, the paste filling mining generally has the problem of long solidification time of the paste, which leads to the low efficiency of the paste filling mining for a long time. [0003] In this regard, in order to realize the high-efficiency paste filling mining mode, the method of adding liquid accelerator at the outlet of the filling pipeline can greatly shorten the setting time of the paste, thereby improvi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/22C04B24/12
Inventor 刘刚李梦李亮安虎
Owner XUZHOU CUMT BACKFILL TECH
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