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Method for lowering crystallization point of ammonium nitrate supersaturated solution by using additives

A technology of additives and crystallization points, applied in the direction of explosives, etc., can solve the problems of reduced workability, reduced emulsification, explosive power and limitation of water-gel explosives, etc., and achieves the effects of enhanced frost resistance, power and storage stability.

Inactive Publication Date: 2009-12-16
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the implementation of these methods will seriously reduce the explosive power of emulsified and water-gel explosives, and the working ability will be reduced by about 10-20%, so the application is limited to a certain extent.

Method used

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  • Method for lowering crystallization point of ammonium nitrate supersaturated solution by using additives
  • Method for lowering crystallization point of ammonium nitrate supersaturated solution by using additives
  • Method for lowering crystallization point of ammonium nitrate supersaturated solution by using additives

Examples

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Effect test

Embodiment 1

[0020] Add the compound containing 15% of ethylene glycol and 85% of urea into the supersaturated hot solution of ammonium nitrate with a mass concentration of 85%, and the addition amounts are 1%, 4%, 6%, and 8% of the mass of the ammonium nitrate solution, respectively. , Stir and dissolve, and measure the crystallization point of the ammonium nitrate solution according to the above method. The crystallization point of the ammonium nitrate solution is lowered to 103°C, 98°C, 95°C, and 91°C respectively from 118°C of the unadded compound.

Embodiment 2

[0022] Add the compound containing 20% ​​of ethylene glycol and 80% of urea into the supersaturated hot solution of ammonium nitrate with a mass concentration of 85%, and the addition amounts are 1%, 4%, 6%, and 8% of the mass of the ammonium nitrate solution, respectively. , Stir, dissolve, measure the crystallization point of the ammonium nitrate solution according to the above method, the crystallization point of the ammonium nitrate solution is lowered from 118°C of the unadded compound to 101°C, 96°C, 92°C, 90°C respectively.

Embodiment 3

[0024] Add the compound containing 25% of ethylene glycol and 75% of urea into the supersaturated hot solution of ammonium nitrate with a mass concentration of 85%, and the addition amounts are 1%, 4%, 6%, and 8% of the mass of the ammonium nitrate solution, respectively. , Stir, dissolve, measure the crystallization point of the ammonium nitrate solution according to the above method, the crystallization point of the ammonium nitrate solution is lowered from 118°C of the unadded compound to 101°C, 97°C, 94°C, 90°C respectively.

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Abstract

The invention discloses a method for using the additives to lower the crystallization point of a ammonium nitrate supersaturated solution. The method comprises the steps that the additives are added in the ammonium nitrate supersaturated solution as water phase of an emulsion explosive and the used amount of the additives is equal to 1 per cent to 6 per cent of the mass of the water phase of the emulsion explosive or the additives are added in the ammonium nitrate supersaturated solution as the water phase of the water gel explosive and the used amount of the additives accounts for 1 per cent to 8 per cent of the mass of the water phase of the water gel explosive. The invention has an outstanding effect on controlling the crystal form and crystal growth of the ammonium nitrate so as to lower the crystallization point of the ammonium nitrate supersaturated solution and lower the crystallization point temperature of the ammonium nitrate supersaturated solution by 15 to 30 DEG C, and the power and storage stability of the emulsion and water gel explosives prepared with using the ammonium nitrate supersaturated solution in which the additives are contained as the water phase are remarkably enhanced and the frost resistance of the water gel explosive prepared by using the ammonium nitrate supersaturated solution in which the additives are contained as the water phase is outstandingly strengthened.

Description

technical field [0001] The invention belongs to the technology for reducing the crystallization point of emulsified and water-gel explosives, in particular to a method for reducing the crystallization point of ammonium nitrate supersaturated solution by using additives. Background technique [0002] Emulsion explosives are highly supersaturated ammonium nitrate and other oxidant aqueous solutions as the internal phase, compound fuel oil as the external phase, and form a W / O emulsion body under the action of an external force through an emulsifier, which is sensitized by air bubbles. Industrial mixed explosives and water-gel explosives are also water-resistant industrial explosives formed by gelling and cross-linking with highly supersaturated ammonium nitrate and other oxidant aqueous solutions as the internal phase and methylamine nitrate as a sensitizer. In recent years, they have developed rapidly. [0003] Ammonium nitrate, which is the oxidant of emulsified and water-ge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C06B31/28
Inventor 叶志文刘祖亮钱华
Owner NANJING UNIV OF SCI & TECH
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