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Rock type low-temperature anti-caking modified ANFO (Ammonium Nitrate Fuel Oil) explosive and preparation method thereof

An ammonium explosive and anti-caking technology, applied in the direction of explosives, etc., can solve the problems of the blasting effect failing to meet the design requirements, the small bulk density of the blasting charge, and the increased labor of the blaster, and achieving a difficult-to-crystallize structure. The effect of block, production process is safe and reliable, and it is not easy to absorb moisture and agglomerate

Active Publication Date: 2013-11-20
WEIFANG LONGHAI FOLK DYNAMLTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When a blasting user charges explosives in deep hole blasting in the open air, on the one hand, it is difficult to load the explosives agglomerated into the blast hole; even if a wooden stick is used to knock the explosive packaging bag, once there are a few unbroken explosives agglomerated, it is easy to block them On the other hand, even if the explosive agglomerates are small and can be fully loaded into the blast hole, there may be gaps between the explosive agglomerates, so that the charge density of the blast hole is small, which will cause residual foundation Many, high block rate
In short, the caking problem of this kind of modified ammonium oil explosives in winter not only increases the labor workload of the blasters, but more importantly, it is easy to cause the blasting effect to fail to meet the design requirements, and even bring various safety hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A rock-type low-temperature anti-caking modified ammonium oil explosive is prepared by using the following mass percentage raw materials:

[0033] 92.0% of ammonium nitrate; 4.5% of wood powder, the passing rate of the 40 mesh sieve of the wood powder is ≥ 92wt%; 0.4% of the composite modifier, the composite modifier is the phosphate of octadecylamine; 3.1% The composite oil phase, the kinematic viscosity of the composite oil phase at 100°C is 12mm 2 / s, the drop melting point is 20°C, and the composite oil phase is a mixture of composite wax, ozokerite wax, and microcrystalline wax.

[0034] The following production steps are used:

[0035] (1) Dry the wood powder, pass it through a 40-mesh sieve, and the sieving rate is ≥92wt%, and store it separately in a sealed manner to ensure that the moisture content is below 1wt%.

[0036] (2) Ammonium nitrate is crushed for the first time, dried by air flow, modified by adding a composite modifier accounting for 0.4% of the t...

Embodiment 2

[0042] A rock-type low-temperature anti-caking modified ammonium oil explosive is prepared by using the following mass percentage raw materials:

[0043] 90.6% ammonium nitrate; 5.5% wood powder, the passing rate of the wood powder 40 mesh sieve ≥ 91wt%; 0.5% composite modifier, the composite modifier is the sulfonate of octadecylamine; 3.4 % composite oil phase, the kinematic viscosity of the composite oil phase at 100°C is 14mm 2 / s, the drop melting point is 25°C, and the composite oil phase is a mixture of microcrystalline wax, minus three line oil, and rosin.

[0044] The following production steps are used:

[0045] (1) Dry the wood powder, pass it through a 40-mesh sieve, and the sieving rate is ≥91wt%, and store it separately in an airtight manner to ensure a moisture content of 0.5wt%.

[0046] (2) Ammonium nitrate is crushed for the first time, dried by air flow, modified by adding a composite modifier accounting for 0.5% of the total weight of the raw material, an...

Embodiment 3

[0052] A rock-type low-temperature anti-caking modified ammonium oil explosive is prepared by using the following mass percentage raw materials:

[0053] 91.55% of ammonium nitrate; 5.0% of wood powder, the wood powder 40 mesh pass rate ≥ 95wt%; 0.45% of composite modifier, the composite modifier is octadecylamine phosphate and boric acid A mixture of salts; 3.0% of a composite oil phase whose kinematic viscosity at 100°C is 15mm 2 / s, the drop melting point is 28°C, and the composite oil phase is a mixture of microcrystalline wax, three-line oil, rosin, and animal and vegetable oils.

[0054] The following production steps are used:

[0055] (1) Dry the wood flour, pass it through a 40-mesh sieve, and the sieving rate is ≥95wt%, and store it in sealed containers to ensure that the moisture content is below 1wt%.

[0056] (2) Ammonium nitrate is crushed for the first time, dried by air flow, modified by adding a compound modifier accounting for 0.45% of the total weight of t...

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Abstract

The invention discloses a rock type low-temperature anti-caking modified ANFO (Ammonium Nitrate Fuel Oil) explosive and a preparation method thereof. The ANFO explosive is prepared from the following raw materials in percentages by mass: 90.5-92.0% of ammonium nitrate, 4.5-5.5% of wood flour, 0.3-0.5% of composite modifying agent, and 3.0-4.0% of composite oil phase, wherein the passing rate of the wood flour on a 40-mesh screen is not less than 90wt%, the kinematic viscosity of the composite oil phase at 100 DEG C is 12-16mm<2> / s, and the drop melting point of the composite oil phase is 20-32 DEG C. The preparation method of the ANFO explosive comprises the following steps: drying the ammonium nitrate, adding the composite modifying agent into the dried ammonium nitrate for modification, adding the composite oil phase and the wood flour into the modified ammonium nitrate and uniformly mixing, conveying the uniform mixture into a continuous type ball mill by using a feed screw conveyor for continuous milling and mixing, cooling to be not higher than 40 DEG C, and at last carrying out charging and packaging by using a full-automatic charging machine to obtain a product with the water content not high than 0.15%. The production process of the ANFO explosive disclosed by the invention is safe and reliable, the raw materials can be uniformly mixed, the free-running property of the produced explosive is improved, and the anti-caking capacity of the explosive at a low-temperature state is improved.

Description

technical field [0001] The invention relates to the technical field of ammonium oil explosives, in particular to a rock-type low-temperature anti-caking modified ammonium oil explosive and its preparation. Background technique [0002] Common rock-type modified ammonium oil explosives consist of: ammonium nitrate, composite oil phase, modifier, and wood powder. The patent with application number 201210282086.2 proposes a new material of modified ammonium oil explosives, specifically related to a modified ammonium oil explosives using rice husk powder and sunflower seed hull powder as combustible agents, and the proportioning composition is ammonium nitrate 91.5~ 93.5wt%, composite modifier 0.2-0.4wt%, composite oil phase 3.0-4.0wt%, combustible agent 3.5-4.5wt%, wherein the composite modifier is phosphate and sulfonate of octadecylamine or a mixture of one or more borates, the composite oil phase is a mixture of one or more of paraffin wax, soap wax, asphalt, third-line oil...

Claims

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Application Information

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IPC IPC(8): C06B31/30
Inventor 张建亮商云锋
Owner WEIFANG LONGHAI FOLK DYNAMLTE
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