Preparation method of low-blast-velocity high-blast-heat bulging ammonium nitrate explosive for explosive welding

Abstract

The present application relates to the technical field of puffed ammonium nitrate explosive production, and particularly relates to a preparation method of low-explosive-velocity high-explosive-heat puffed ammonium nitrate explosive for explosive welding; a small amount of glycerol is added in the puffed composite fat to prevent the explosive from being easily moisture-absorbed and clustered in field operation, and meanwhile, the explosive heat of the explosive is increased; in step 3, calcium sulfate and ammonium sulfate are mixed according to a mass ratio of 1:3 to serve as a dispersing agent, and the puffed ammonium nitrate explosive is diluted, so that the puffed ammonium nitrate explosive has the characteristics of low-explosive-velocity and good flowability; in the present application, a conventional dispersing agent component such as yellow stone powder is not used, but calcium sulfate and ammonium sulfate are mixed according to a mass ratio of 1:3; under this ratio, the explosive heat of the explosive can be further improved under the condition of low-explosive-velocity, and when applied to explosive welding, the interface bonding rate of the explosive welding can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of expanded ammonium nitrate explosive production, and particularly relates to a preparation method of low-explosive-speed high-explosive-heat expanded ammonium nitrate explosive for explosive welding. BACKGROUND

[0002] Metal explosive welding is a special welding method, which makes two or more kinds of metal materials compound with each other through high temperature generated by explosive explosion, to form a composite material of multiple metals, thereby greatly expanding the performance and application range of single metal. As the energy source for welding, the metal explosive welding explosive has the following characteristics according to the long-term experience of the applicant in the field of metal explosive welding: first, the explosive explosion performance should meet the requirements of low-explosive-speed and high-explosive-heat for explosive welding; second, the explosive has high requirements for flowability, and the explosive should be easy to lay and have high flowability; third, the explosive has high uniformity of various components and is not easy to absorb moisture and form agglomerates; and fourth, the explosive has large density and small thickness when laid. Only the explosive meeting the above characteristics is suitable for metal explosive welding. SUMMARY

[0003] The present application solves the technical problem of providing a preparation method of low-explosive-speed high-explosive-heat expanded ammonium nitrate explosive for explosive welding, so that the prepared expanded ammonium nitrate explosive meets the requirements of low-explosive-speed and high-explosive-heat for explosive welding process.

[0004] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows:

[0005] The preparation method of low-explosive-speed high-explosive-heat expanded ammonium nitrate explosive for explosive welding comprises the following steps:

[0006] S1: melt the expanded composite fat, add glycerol, and stir until uniform, wherein the mass ratio of glycerol to expanded composite fat is 4-5:100;

[0007] S2: mix expanded ammonium nitrate, wood powder and expanded composite fat according to the mass ratio of 91-93:3.5-5:3.5-5 to prepare an expanded ammonium nitrate explosive body;

[0008] S3: mix calcium sulfate and ammonium sulfate according to the mass ratio of 1:3 to prepare a mixed material;

[0009] S4: mix the mixed material and the expanded ammonium nitrate explosive body according to the mass ratio of 35-45:55-65 to prepare low-explosive-speed high-explosive-heat expanded ammonium nitrate explosive.

[0010] Further, in the above preparation method of low-explosive-speed high-explosive-heat expanded ammonium nitrate explosive for explosive welding, the calcium sulfate is ultra-fine calcium sulfate passing through a 40-mesh sieve.

[0011] Further, in the preparation method of the low-blast-velocity high-blast-heat puffed ammonium nitrate explosive for explosive welding, the ammonium sulfate is granular ammonium sulfate passing through a 20-mesh sieve.

[0012] Further, in the preparation method of the low-blast-velocity high-blast-heat puffed ammonium nitrate explosive for explosive welding, the mass ratio of the glycerol to the puffed composite fat is 4.5:100.

[0013] The present application has the advantages that: by adding a small amount of glycerol to the puffed composite fat, the explosive is prevented from being easily moisture-absorbed and lumped in field operation, and the explosive blast heat is increased; in step 3, calcium sulfate and ammonium sulfate are mixed according to a mass ratio of 1:3 to serve as a dispersant to dilute the puffed ammonium nitrate explosive, so that the puffed ammonium nitrate explosive has the characteristics of low blast velocity and good flowability; in the present application, a conventional dispersant component such as yellow powder is not used, but calcium sulfate and ammonium sulfate are mixed according to a mass ratio of 1:3, which can further increase the explosive blast heat under the condition of low blast velocity, and can improve the interface bonding rate of explosive welding when applied to explosive welding. DETAILED DESCRIPTION

[0014] To make the technical contents, purposes and effects of the present application clear, the following describes the present application in combination with embodiments.

[0015] The embodiment of the present application relates to a preparation method of a low-blast-velocity high-blast-heat puffed ammonium nitrate explosive for explosive welding, which comprises the following steps:

[0016] S1: melt the puffed composite fat, add glycerol, and stir until uniform, wherein the mass ratio of the glycerol to the puffed composite fat is 4-5:100;

[0017] S2: mix puffed ammonium nitrate, wood powder and puffed composite fat according to a mass ratio of 91-93:3.5-5:3.5-5 to prepare a puffed ammonium nitrate explosive body;

[0018] S3: mix calcium sulfate and ammonium sulfate according to a mass ratio of 1:3 to prepare a mixed material;

[0019] S4: mix the mixed material and the puffed ammonium nitrate explosive body according to a mass ratio of 35-45:55-65 to prepare a low-blast-velocity high-blast-heat puffed ammonium nitrate explosive.

[0020] As a preferred embodiment, the calcium sulfate is superfine calcium sulfate passing through a 40-mesh sieve.

[0021] As a preferred embodiment, the ammonium sulfate is granular ammonium sulfate passing through a 20-mesh sieve.

[0022] As a preferred embodiment, the mass ratio of the glycerol to the puffed composite fat is 4.5:100.

[0023] In the above embodiments, the expanded composite fat is an expanded composite fat product purchased from Shanxi Jiulian Hongyuan Chemical Co., Ltd.

[0024] In the above embodiments, by adding a small amount of glycerol to the expanded composite fat, the explosive is prevented from being easily hygroscopic and clumped during field operation, and the explosive explosion heat is increased. In step 3, calcium sulfate and ammonium sulfate are mixed in a mass ratio of 1:3 to serve as a dispersant, dilute the expanded ammonium nitrate explosive, and make the expanded ammonium nitrate explosive have the characteristics of low explosion speed and good flowability. In the present application, a conventional dispersant ingredient such as yellow stone powder is not used, but calcium sulfate and ammonium sulfate are mixed in a mass ratio of 1:3. This ratio can further improve the explosion heat of the explosive under the condition of low explosion speed. First, when ammonium sulfate is subjected to severe impact, friction, high temperature or ignition source, the bond structure in the molecule will break. In this process, ammonium sulfate will decompose into sulfate ions and ammonium ions. This decomposition process itself is an endothermic reaction that will absorb part of the heat; then, the sulfate ions will further decompose into sulfur dioxide and sulfur trioxide at high temperature, and the ammonium ions will also decompose into ammonia and water vapor at high temperature. This reaction also produces a large amount of gas to increase the power of the explosion. All these reactions will produce a large amount of gas, including ammonia, sulfur dioxide and water vapor. This violent oxidation reaction and combustion process forms the explosion of ammonium sulfate.

[0025] The low-explosive high-explosive expanded ammonium nitrate explosive for explosive welding involved in the present application can improve the interface bonding rate of explosive welding when applied to explosive welding.

[0026] Example 1

[0027] The preparation method of the low-explosive high-explosive expanded ammonium nitrate explosive for explosive welding comprises the following steps:

[0028] S1: melt the expanded composite fat, add glycerol, stir uniformly, and the mass ratio of glycerol to expanded composite fat is 4.5:100;

[0029] S2: mix the expanded ammonium nitrate, wood powder and expanded composite fat in a mass ratio of 92:4:4.5 to prepare the expanded ammonium nitrate explosive body;

[0030] S3: mix calcium sulfate and ammonium sulfate in a mass ratio of 1:3 to prepare the mixed material; the calcium sulfate is superfine calcium sulfate passing through a 40-mesh sieve; the ammonium sulfate is granular ammonium sulfate passing through a 20-mesh sieve; the density of the calcium sulfate is 2.96 g / cm 3 ; the density of the ammonium sulfate is 1.77 g / cm 3 ;

[0031] S4: the mixed material and the expanded ammonium nitrate explosive body are mixed uniformly at a mass ratio of 40:60 to prepare the low detonation velocity high explosion heat expanded ammonium nitrate explosive.

[0032] Example 2

[0033] The preparation method of the low detonation velocity high explosion heat expanded ammonium nitrate explosive for explosive welding comprises the following steps:

[0034] S1: the expanded composite fat is melted, glycerol is added, and stirring is uniformly performed, and the mass ratio of glycerol to expanded composite fat is 4:100;

[0035] S2: the expanded ammonium nitrate, wood powder and expanded composite fat phase are mixed at a mass ratio of 91:3.5:3.5 to prepare an expanded ammonium nitrate explosive body;

[0036] S3: calcium sulfate and ammonium sulfate are mixed at a mass ratio of 1:3 to prepare a mixed material; the calcium sulfate is superfine calcium sulfate passing through a 40-mesh sieve; the ammonium sulfate is granular ammonium sulfate passing through a 20-mesh sieve; the density of the calcium sulfate is 2.96 g / cm 3 ; the density of the ammonium sulfate is 1.77 g / cm 3 ;

[0037] S4: the mixed material and the expanded ammonium nitrate explosive body are mixed uniformly at a mass ratio of 35:65 to prepare the low detonation velocity high explosion heat expanded ammonium nitrate explosive.

[0038] Example 3

[0039] The preparation method of the low detonation velocity high explosion heat expanded ammonium nitrate explosive for explosive welding comprises the following steps:

[0040] S2: the expanded composite fat is melted, glycerol is added, and stirring is uniformly performed, and the mass ratio of glycerol to expanded composite fat is 5:100;

[0041] S2: the expanded ammonium nitrate, wood powder and expanded composite fat phase are mixed at a mass ratio of 93:5:5 to prepare an expanded ammonium nitrate explosive body;

[0042] S3: calcium sulfate and ammonium sulfate are mixed at a mass ratio of 1:3 to prepare a mixed material; the calcium sulfate is superfine calcium sulfate passing through a 40-mesh sieve; the ammonium sulfate is granular ammonium sulfate passing through a 20-mesh sieve; the density of the calcium sulfate is 2.96 g / cm 3 ; the density of the ammonium sulfate is 1.77 g / cm 3 ;

[0043] S4: the mixed material and the expanded ammonium nitrate explosive body are mixed uniformly at a mass ratio of 45:55 to prepare the low detonation velocity high explosion heat expanded ammonium nitrate explosive.

[0044] Comparative Example 1

[0045] The preparation method of the low-blast-velocity high-blast-heat puffed ammonium nitrate explosive for explosive welding described in Embodiment 1 is different in that S1 is omitted.

[0046] Comparative Example 2

[0047] The preparation method of the low-blast-velocity high-blast-heat puffed ammonium nitrate explosive for explosive welding described in Embodiment 1 is different in that, in S3, the addition of calcium sulfate is omitted, and all is replaced by ammonium sulfate.

[0048] Comparative Example 3

[0049] The preparation method of the low-blast-velocity high-blast-heat puffed ammonium nitrate explosive for explosive welding described in Embodiment 1 is different in that, in S3, the addition of ammonium sulfate is omitted, and all is replaced by calcium sulfate.

[0050] Comparative Example 4

[0051] The preparation method of the low-blast-velocity high-blast-heat puffed ammonium nitrate explosive for explosive welding described in Embodiment 1 is different in that, in S3, the addition of ammonium sulfate and calcium sulfate is omitted, and all is replaced by yellow stone powder.

[0052] The puffed ammonium nitrate explosives prepared in Examples 1-3 and Comparative Examples 1-4 are tested for performance, and the results are shown in Table 1.

[0053] Table 1

[0054]

[0055] As can be seen from the results in Table 1, the puffed ammonium nitrate explosives prepared in Examples 1-3 have higher blast heat values at low blast velocities, and the interface bonding rate of explosive welding is the highest, indicating that they are more suitable for use in explosive welding, compared with Comparative Examples 1-4.

[0056] The above only describes the embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent transformation or direct or indirect application in related technical fields using the content of the present application is also included in the patent protection scope of the present application.

Claims

1. A process for the preparation of low detonation velocity high heat of detonation bulking ammonium nitrate explosive for explosive welding, characterized in that, The method comprises the following steps: S1: melt the expanded compound fat, add glycerol, stir uniformly, and the mass ratio of glycerol to expanded compound fat is 4-5:100; S2: mix expanded ammonium nitrate, wood powder and expanded compound fat phase according to the mass ratio of 91-93:3.5-5:3.5-5, and prepare an expanded ammonium nitrate explosive body; S3: mix calcium sulfate and ammonium sulfate according to the mass ratio of 1:3, and prepare a mixture; S4: mix the mixture and the expanded ammonium nitrate explosive body according to the mass ratio of 35-45:55-65, and prepare a low-blast-velocity high-blast-heat expanded ammonium nitrate explosive.

2. A process for the preparation of low detonation velocity high heat of detonation exfoliated ammonium nitrate explosive for explosive welding as claimed in claim 1 wherein, The calcium sulfate is superfine calcium sulfate passing through a 40-mesh screen.

3. The process for the preparation of low detonation velocity high heat of detonation exfoliated ammonium nitrate explosive for explosive welding as claimed in claim 1 wherein, The ammonium sulfate is granular ammonium sulfate passing through a 20-mesh screen.

4. The process for the preparation of low detonation velocity high heat of detonation exfoliated ammonium nitrate explosive for explosive welding as claimed in claim 1 wherein, The mass ratio of glycerol to expanded compound fat is 4.5:100.

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