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A kind of rock coal pre-splitting agent and preparation method thereof

A pre-cracking and adhesive technology, applied in the field of pyrotechnics, can solve the problems of large shock waves, small range of action, inability to use top coal caving, top cutting operations, etc., achieve high burning speed and pressure index, and improve coal mining recovery rate effect

Active Publication Date: 2021-12-10
HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the pre-splitting technologies currently in use or being developed at home and abroad mainly include: 1) hydraulic fracturing technology using high-pressure water pumps for hydraulic punching and hydraulic fracturing; 2) loose blasting technology based on detonator explosives; 3) based on carbon dioxide extractor The gas impact technology; the fracturing effect of the hydraulic fracturing technology is far from the expected, and although the explosive power of the detonator and explosives is huge, the range of action is small and the shock wave is large. After increasing the amount of blasting, the effect of coal discharge can barely reach the operation Requirements: The carbon dioxide blaster equipment is complex and needs to inject liquid carbon dioxide, which cannot be used for top coal caving and roof cutting operations

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  • A kind of rock coal pre-splitting agent and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0037] A kind of rock coal pre-splitting agent, its formula composition (calculated by mass percentage) is as follows:

[0038] Binder: HTPB, 1.5%;

[0039] Plasticizer: dioctyl sebacate, 1.0%;

[0040] Fuel: Guanidine Nitrate, 11%;

[0041] Fuel: C powder, 8%;

[0042] Fuel: DAP, 14%, where M is K + ;

[0043] Burning rate modifier: 0.5%, wherein iron oxide content is 0.2% of the total mass of the formula;

[0044] Oxidant: KP, 64%; the content of type I KP is 30% of the total mass of KP, the content of type II KP is 55% of the total mass of KP; the content of type III KP is 15% of the total mass of KP;

[0045] Preparation:

[0046] (1) Weighing according to the above-mentioned selected formula ratio, first join binder HTPB, dioctyl sebacate, speed regulator, fuel DAP into the acoustic resonance mixer and mix, and the mixing speed is 20g (acceleration of gravity ); the mixing time is 7min; the mixing temperature is 30-40°C;

[0047] (2) Add the rest of the fuel to th...

Embodiment 2

[0053] A kind of rock coal pre-splitting agent, its formula composition (calculated by mass percentage) is as follows:

[0054] Binder: HTPB, 1.5%;

[0055] Plasticizer di-isooctyl sebacate, 1.5%;

[0056] Fuel: Guanidine Nitrate, 8%;

[0057] Fuel: C powder, 6%;

[0058] Fuel: DAP, 12%, where M is NH 4 + ;

[0059] Burning rate regulator: 1.0%, in which iron oxide content is 0.5% of the total formula;

[0060] Oxidant: KP, 70%; the content of type I KP is 20% of the total mass of KP, the content of type II KP is 70% of the total mass of KP; the content of type III KP is 10% of the total mass of KP;

[0061] Preparation:

[0062] (1) Weighing according to the above-mentioned selected formula ratio, first join binder HTPB, dioctyl sebacate, speed regulator, fuel DAP into the acoustic resonance mixer and mix, and the mixing speed is 20g (acceleration of gravity ); the mixing time is 7min; the mixing temperature is 30-40°C;

[0063] (2) Add the rest of the fuel to the ac...

Embodiment 3

[0070] A kind of rock coal pre-splitting agent, its formula composition (calculated by mass percentage) is as follows:

[0071] Binder: CTPB, 1.5%;

[0072] Plasticizer di-isooctyl sebacate, 1.5%;

[0073] Fuel: Guanidine Nitrate, 11%;

[0074] Fuel: C powder, 8%;

[0075] Fuel: DAP, 16%, where M is NH 4 + ;

[0076] Burning rate regulator: 1.0%, in which iron oxide content is 0.4% of the total formula;

[0077] Oxidant: KP, 61%; the content of type I KP is 25% of the total mass of KP, the content of type II KP is 65% of the total mass of KP; the content of type III KP is 10% of the total mass of KP;

[0078] Preparation:

[0079] (1) Weighing according to the above-mentioned selected formula ratio, first add binder CTPB, diisooctyl sebacate, speed regulator, fuel DAP to the acoustic resonance mixer and mix at a mixing speed of 20g (gravity acceleration); the mixing time is 5min; the mixing temperature is 30-40°C;

[0080] (2) Add the rest of the fuel to the acoustic ...

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Abstract

The invention provides a rock coal pre-splitting agent and a preparation method thereof. The pre-cracking agent does not contain elemental metal powder, its combustion temperature is between 2800K ~ 3200K, the measured specific volume is greater than 600L / kg; The burning rate pressure index of 10MPa is not less than 1.5. The rock coal pre-splitting agent has good safety performance, friction sensitivity and impact sensitivity are not greater than 20%, and static spark sensitivity is greater than 120mJ. The explosion point in the 5s lag period is greater than 300°C, and the danger level belongs to 1.3. The rock coal pre-splitting agent of the present invention has simple production process, low cost, no need for solidification and granulation, and is suitable for mass production. It is suitable for rock, coal seam, mine blasting and other fields.

Description

technical field [0001] The invention belongs to the technical field of pyrotechnics, and in particular relates to a rock coal pre-splitting agent and a preparation method thereof. Background technique [0002] Coal is the non-renewable strategic resource with the largest reserves and the widest distribution in China. There are more than 20,000 large and medium-sized coal mines in China, with an annual output of 3.5 billion tons of coal. [0003] my country's coal mining has gradually formed a situation where blast mining, general mining, and fully mechanized (continuous mining) techniques coexist from the initial development stages of manual mining-blast mining-general mining-fully mechanized mining (continuous mining). Large-scale underground coal mines have the highest degree of mechanization and use the most processes. Regardless of the mining process, the loosening and pre-cracking of coal seams has always been the core issue of research. [0004] At present, the pre-s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C06B29/16C06B29/22C06B21/00C06B23/00E21C41/16
CPCC06B29/16C06B29/22C06B21/0025C06B23/007E21C41/16
Inventor 熊伟强朱雯娟朱文博周重洋王鹏付文斌李忠友赵新岩
Owner HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY