Improved liquid mixing type expanded ammonium nitrate explosive as well as preparation method and application thereof

Abstract

The invention relates to an improved liquid-mixed expanded ammonium nitrate explosive which comprises the following components: 91-93 parts of ammonium nitrate, 1.16-2.25 parts of engine oil, 1.75-3 parts of vaseline, 3.5-4.5 parts of wood flour, 0.12-0.15 part of an expanding agent and 5-15 parts of a functional additive, the formula improves the free-running property and bulk density of the product, meets the requirement for easy filling in blasting operation, and saves the cost; the invention further relates to a preparation method of the improved liquid mixing type expanded ammonium nitrate explosive, automatic equipment, informatization and intelligent technologies and remote automatic control operation are adopted, few-person production is realized, the product quality is stable, and the intrinsic safety is remarkably improved; the prepared improved liquid-mixed expanded ammonium nitrate explosive is applied to blasting construction in Guizhou regions, adapts to landforms and rock hardness of different regions, stabilizes the rock hardness and improves the blasting efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of explosives, and in particular to an improved liquid-mixed expanded ammonium nitrate explosive and a preparation method and application thereof. Background Art

[0002] Ammonium nitrate explosive is a powdered explosive mechanical mixture, one of the most widely used industrial explosives, with medium power and certain sensitivity. It is hygroscopic and agglomerated, and its sensitivity and power are significantly reduced when it is damp, and it also produces poisonous gas.

[0003] Expanded ammonium nitrate explosives are a type of powdered mixed explosives that use expanded ammonium nitrate with microporous and flaky structures as the main oxidant, with an appropriate amount of combustible agent and other functional additives. Its microporous structure has a sensitizing effect that can form hot spots for detonation, without the need to add single explosives, highly sensitive salts or metal powders and other sensitizers as in general industrial explosives, which can reduce costs, pollution and the dangers in production and use.

[0004] The functional additive material itself is safe and stable, has good oil absorption and is compatible with the safety characteristics of expanded ammonium nitrate. Heavy calcium carbonate, commonly known as heavy calcium, is a widely used chemical raw material with high chemical purity, high inertness, low chemical reaction and good thermal stability, which is made by directly crushing natural calcite, limestone, chalk, shells, etc. by mechanical methods.

[0005] At present, the production process technology of expanded ammonium nitrate explosive production line adopts "liquid mixing" expanded ammonium nitrate explosive continuous expansion production process technology and complete set of pharmaceutical equipment. In recent years, with the large-scale promotion and application of expanded ammonium nitrate explosives, the product has gradually shown some shortcomings: the product has high viscosity, poor fluidity, and low bulk density, resulting in low production efficiency and affecting production capacity; the product is easy to agglomerate. Guizhou Province is in a season with high humidity all year round, and expanded ammonium nitrate explosive products are easy to agglomerate, resulting in product performance degradation and failure; Guizhou has different regional topography and rock hardness. Different densities of expanded ammonium nitrate explosives are needed for blasting construction to form a reasonable charge and stabilize and improve blasting efficiency. However, the current production process conditions cannot meet the market demand for expanded ammonium nitrate explosives with different bulk densities, especially high-density expanded ammonium nitrate explosives.

[0006] In response to the above problems, the research team used the existing expanded ammonium nitrate explosive production line to further carry out research on the improvement of the expanded ammonium nitrate explosive formula and process technology. The improved liquid-mixed expanded ammonium nitrate explosive product was tested for explosion performance, thermal stability, etc. by the National Civil Explosive Equipment Quality Supervision and Inspection Center, and various performance indicators met the requirements of GB 28286-2012 General Technical Conditions for Industrial Explosives. Summary of the invention

[0007] In order to solve the above-mentioned defects existing in the prior art, the purpose of the present invention is to provide an improved liquid-mixed expanded ammonium nitrate explosive, adding functional additives to improve the physical and chemical properties, explosion performance, fluidity, anti-caking performance and charge density of the expanded ammonium nitrate explosive, improve the production safety of the expanded ammonium nitrate explosive product and the suitability of the product for use, and also provide a preparation method of the improved liquid-mixed expanded ammonium nitrate explosive and its application.

[0008] The part described in the present invention is a conventional weight unit in the art, which may be mg, g, kg, t, etc.

[0009] The purpose of the present invention is to provide an improved liquid-mixed expanded ammonium nitrate explosive.

[0010] An improved liquid-mixed expanded ammonium nitrate explosive comprises the following components: 91-93 parts of ammonium nitrate, 1.16-2.25 parts of engine oil, 1.75-3 parts of vaseline, 3.5-4.5 parts of wood flour, 0.12-0.15 parts of expander and 5-15 parts of functional additives.

[0011] Furthermore, the improved liquid-mixed expanded ammonium nitrate explosive comprises the following components: 91.5-92.5 parts of ammonium nitrate, 1.5-2.0 parts of engine oil, 2.0-2.5 parts of vaseline, 3.75-4.25 parts of wood powder, 0.13-0.14 parts of expander and 8-12 parts of functional additives.

[0012] Furthermore, the improved liquid-mixed expanded ammonium nitrate explosive comprises the following components: 92 parts of ammonium nitrate, 2 parts of engine oil, 2 parts of vaseline, 4 parts of wood powder, 0.13 parts of expander and 10 parts of functional additives.

[0013] Furthermore, the functional additive is one of calcined lime, heavy calcium carbonate and marble powder.

[0014] Preferably, the functional additive is heavy calcium carbonate.

[0015] Furthermore, the improved liquid-mixed expanded ammonium nitrate explosive also includes 0.12 to 0.15 parts of a expander, and when the oil phase contains the expander, no expander is added to the ammonium nitrate solution.

[0016] Furthermore, the improved liquid-mixed expanded ammonium nitrate explosive also includes 0.13 parts of a swelling agent.

[0017] Another object of the present invention is to provide a method for preparing an improved liquid-mixed expanded ammonium nitrate explosive, comprising the following steps:

[0018] S1 Water and oil phase preparation and storage: The ammonium nitrate aqueous solution is pumped into the water phase preparation tank in the water-oil phase preparation workshop, water is added to prepare the water phase, the prepared water phase is pumped to the water phase storage tank in the expanded ammonium nitrate explosive pharmaceutical workshop for standby use, the oil phase is transported to the preparation tank in the oil phase preparation workshop by a tank truck for melting and heat preservation, and then transported to the oil phase storage tank in the expanded ammonium nitrate explosive pharmaceutical workshop for standby use;

[0019] S2 Dynamic mixing and puffing: water and oil phase solutions are metered and pumped into the mixer for mixing and then enter the puffing crystallizer for continuous puffing to obtain a uniform powdered ammonium oil mixture;

[0020] S3 Mixing and conveying: According to the process formula requirements, the wood powder and functional additives are mixed with expanded ammonium nitrate through their respective material conveying screws. The mixed expanded ammonium nitrate explosive is crushed by a pulverizer, mixed and cooled by a mixer and a cooling screw, and then transported to the charging and packaging workshop through a material conveying system for charging and packaging;

[0021] S4 Charging, packaging and finished product transfer: The semi-finished products of expanded ammonium nitrate explosives are transported by the material conveying system to the second-floor hopper of the charging and packaging workshop, and then sent to the charging and packaging station by the material conveying screw. After being bagged by the packaging machine, they are sent to the finished product transfer platform through the product conveyor belt and loaded by the platform robot.

[0022] Furthermore, in step S1, water and oil phases are prepared and stored. The ammonium nitrate aqueous solution is pumped into the water phase preparation tank in the water-oil phase preparation workshop, and a certain proportion of water is added to prepare the water phase so that the ammonium nitrate concentration is 91% to 93%. The prepared water phase is pumped to the water phase storage tank in the expanded ammonium nitrate explosive pharmaceutical workshop for standby use.

[0023] Furthermore, in step S1, water and oil phases are prepared and stored. The oil phase is prepared by mixing engine oil with an additive, wherein the additive is vaseline, which is heated to 85-95° C. in a ratio of 1:1-1:2 and kept warm until completely melted, and kept warm for later use.

[0024] Furthermore, in step S1, the water and oil phases are prepared and stored, and the composite oil phase is compounded with engine oil and an additive, wherein the additive is vaseline, which is heated to 90° C. in a 1:1 ratio and kept warm until completely melted, and then kept warm at 65° C. for standby use.

[0025] Another object of the present invention is to provide an improved liquid-mixed expanded ammonium nitrate explosive for use in blasting construction.

[0026] The beneficial effects of the present invention are:

[0027] 1. The improved liquid-mixed expanded ammonium nitrate explosive utilizes the advantages of regular heavy calcium carbonate particles, high bulk density, not prone to chemical reaction, easy dispersion and low abrasion value, and adds it to the liquid-mixed expanded ammonium nitrate explosive through formula design, thereby improving the fluidity and bulk density of the product and meeting the easy filling requirements in blasting operations. At the same time, all quality indicators of the product meet the "General Technical Conditions for Industrial Explosives" (GB28286-2012).

[0028] 2. Improved method for preparing liquid-mixed expanded ammonium nitrate explosives. The entire production line has low equipment speed and no strong mechanical crushing, mixing, rolling and other equipment. It uses automated equipment, information and intelligent technology, and remote automatic control operation to achieve less-manpowered production, stable product quality, and significantly improved inherent safety.

[0029] 3. For improved liquid-mixed expanded ammonium nitrate explosive, when the annual output is 12,000 tons and the content of functional additives is 10% and 15%, the unit product material cost of improved expanded ammonium nitrate explosive is reduced by RMB 396.10 and RMB 379.60, RMB 134.10 / ton respectively, and the annual material cost can be saved by RMB 4.7532 million and RMB 4.5552 million respectively.

[0030] 4. The improved liquid-mixed expanded ammonium nitrate explosive is used in blasting construction in Guizhou. It can adapt to different regional topography and rock hardness, and stabilize and improve blasting efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a flow chart of the preparation process of the present invention;

[0032] Figure 2 This is the result of the differential scanning calorimeter thermal stability test in Experiment 2, where [1] is the control group sample and [2] is the experimental group sample;

[0033] Figure 3 Thermogravimetric analysis and differential scanning calorimetry curves of typical phase-stabilized ammonium nitrate. DETAILED DESCRIPTION

[0034] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0035] Example 1

[0036] An improved liquid-mixed expanded ammonium nitrate explosive comprises the following components: 92 kg of ammonium nitrate, 2 kg of engine oil, 2 kg of vaseline, 4 kg of wood powder, 0.13 kg of expander and 10 kg of heavy calcium carbonate.

[0037] Example 2

[0038] An improved liquid-mixed expanded ammonium nitrate explosive comprises the following components: 91 g of ammonium nitrate, 1.75 g of engine oil, 1.75 g of vaseline, 3.5 g of wood powder, 0.12 g of expander and 5 g of white powder.

[0039] Example 3

[0040] An improved liquid-mixed expanded ammonium nitrate explosive comprises the following components: 93 kg of ammonium nitrate, 1.5 kg of engine oil, 3 kg of vaseline, 3.75 kg of wood powder, 0.15 kg of expander and 15 kg of marble powder.

[0041] Example 4

[0042] An improved liquid-mixed expanded ammonium nitrate explosive comprises the following components: 92.5 g of ammonium nitrate, 1.75 g of engine oil, 2.25 g of vaseline, 4 g of wood powder, 0.13 g of expander and 12 g of heavy calcium carbonate.

[0043] Example 5

[0044] An improved liquid-mixed expanded ammonium nitrate explosive comprises the following components: 91.5 kg of ammonium nitrate, 1.17 kg of engine oil, 2.33 kg of vaseline, 3.5 kg of wood powder, 0.12 kg of expander and 8 kg of marble powder.

[0045] Example 6

[0046] An improved liquid-mixed expanded ammonium nitrate explosive comprises the following components: 93 kg of ammonium nitrate, 2.15 kg of engine oil, 2.35 kg of vaseline, 4.5 kg of wood powder, 0.15 kg of expander and 10 kg of white powder.

[0047] Example 7

[0048] An improved liquid-mixed expanded ammonium nitrate explosive comprises the following components: 93 kg of ammonium nitrate, 2.5 kg of engine oil, 2.5 kg of vaseline, 4.25 kg of wood powder, 0.14 kg of expander and 10 kg of white powder.

[0049] Example 8

[0050] refer to Figure 1 , a method for preparing an improved liquid-mixed expanded ammonium nitrate explosive comprises the following steps:

[0051] S1 Water and oil phase preparation and storage: The ammonium nitrate aqueous solution is pumped into the water phase preparation tank in the water-oil phase preparation workshop, water is added to prepare the water phase, the prepared water phase is pumped to the water phase storage tank in the expanded ammonium nitrate explosive pharmaceutical workshop for standby use, the oil phase is transported to the preparation tank in the oil phase preparation workshop by a tank truck for melting and heat preservation, and then transported to the oil phase storage tank in the expanded ammonium nitrate explosive pharmaceutical workshop for standby use;

[0052] S2 Dynamic mixing and puffing: water and oil phase solutions are metered and pumped into the mixer for mixing and then enter the puffing crystallizer for continuous puffing to obtain a uniform powdered ammonium oil mixture;

[0053] S3 Mixing and conveying: According to the process formula requirements, the wood powder and functional additives are mixed with expanded ammonium nitrate through their respective material conveying screws. The mixed expanded ammonium nitrate explosive is crushed by a pulverizer, mixed and cooled by a mixer and a cooling screw, and then transported to the charging and packaging workshop through a material conveying system for charging and packaging;

[0054] S4 Charging, packaging and finished product transfer: The semi-finished products of expanded ammonium nitrate explosives are transported by the material conveying system to the second-floor hopper of the charging and packaging workshop, and then sent to the charging and packaging station by the material conveying screw. After being bagged by the packaging machine, they are sent to the finished product transfer platform through the product conveyor belt and loaded by the platform robot.

[0055] Furthermore, in step S1, water and oil phases are prepared and stored. The ammonium nitrate aqueous solution is pumped into the water phase preparation tank in the water-oil phase preparation workshop, and a certain proportion of water is added to prepare the water phase so that the ammonium nitrate concentration is 93%. The prepared water phase is pumped to the water phase storage tank in the expanded ammonium nitrate explosive pharmaceutical workshop for standby use.

[0056] Furthermore, in step S1, the water and oil phases are prepared and stored, and the composite oil phase is compounded with engine oil and an additive, wherein the additive is vaseline, which is heated to 90° C. in a 1:1 ratio and kept warm until completely melted, and then kept warm at 65° C. for standby use.

[0057] Example 8

[0058] Improved liquid-mixed expanded ammonium nitrate explosives are used in blasting construction.

[0059] In order to further verify the effectiveness of the present invention, the inventor conducted a series of verification experiments, the excerpts of which are as follows:

[0060] 1. Reagents and Instruments

[0061] Reagents: ammonium nitrate, compound wax, wood powder, bulking agent, water, heavy calcium carbonate.

[0062] Instruments: NETZSCH 204F1 differential scanning calorimeter, melter, dessicator, mixing tray, standard pendulum vibrator.

[0063] 2. Safety Testing

[0064] Thermal stability and mechanical sensitivity are commonly used methods to evaluate the safety of explosives. This project studies its safety through thermal stability experiments and mechanical sensitivity tests.

[0065] 2.1 Test sample preparation

[0066] Control group: expanded explosive sample without adding functional additives, the preparation method is as follows:

[0067] (1) 92 g of ammonium nitrate and 10 g of water are stirred and dissolved in a melter at 125-128° C. and kept warm for later use;

[0068] (2) Melt 4 g of the composite wax and 0.15 g of the swelling agent at 90° C. and keep warm for later use;

[0069] (3) adding the melted composite oil phase into the ammonium nitrate solution, stirring evenly, and immediately performing vacuum crystallization and puffing for 15 minutes;

[0070] (4) After the expansion and crystallization is completed, 4 g of wood powder is added and mixed evenly on a mixing plate to obtain an expanded ammonium nitrate explosive sample, which is then bagged and placed in a desiccator.

[0071] Experimental group: expanded explosive samples with functional additives added, the specific preparation method is as follows:

[0072] (1) 92 g of ammonium nitrate and 10 g of water are stirred and dissolved in a melter at 125-128° C. and kept warm for later use;

[0073] (2) Melt 4 g of the composite wax and 0.15 g of the swelling agent at 90° C. and keep warm for later use;

[0074] (3) adding the melted composite oil phase into the ammonium nitrate solution, stirring evenly, and immediately performing vacuum crystallization and puffing for 15 minutes;

[0075] (4) After the expansion and crystallization is completed, 4 g of wood powder and 10 g of the functional additive CaCO3 are added and mixed evenly on a mixing plate to obtain an improved expanded ammonium nitrate explosive sample; the sample is bagged and placed in a desiccator.

[0076] 2.2 Thermal stability test

[0077] The samples were tested for thermal stability (DSC) using a NETZSCH 204F1 differential scanning calorimeter to test their decomposition temperature. The experimental conditions were: sample size 12-13 mg, nitrogen atmosphere, heating rate 10°C / min. The test results are shown in Table 3. Figure 2 , curve [1] is the control group sample, and curve [2] is the experimental group sample.

[0078] Figure 3 The thermogravimetric analysis (TG) and differential scanning calorimetry (DSC) curves of typical phase-stabilized ammonium nitrate (PSAN) are from the study of the decomposition of phase-stabilized ammonium nitrate (PSAN) by simultaneous thermal analysis: determination of kinetic parameters, Journal of Thermochemistry, Vol. 319, No. 1-2, October 5, 1998, pp. 55-65. Figure 2 and Figure 3It can be seen that the DSC test results of the samples prepared in the research project are consistent with the literature values, which proves the accuracy of the test results.

[0079] Table 1 Thermal decomposition data

[0080]

[0081] In Table 1, Peak 1, Peak 2 and Peak 3 are the crystal transformation temperatures of ammonium nitrate, Peak 4 is the melting point of ammonium nitrate, and Peak 5 is the decomposition temperature.

[0082] After adding functional additives to the improved expanded explosive, the effect on the crystal transformation temperature and melting point of ammonium nitrate remains basically unchanged, but the decomposition temperature is reduced from 312.8℃ to 250.9℃, a decrease of 61.9℃, indicating that the additive can reduce the decomposition temperature of ammonium nitrate.

[0083] Functional additives are added and mixed evenly in the feeding screw with jacket, blades and shaft three-way water cooling function after the expanded material is discharged from the crystallizer (expander). The material temperature can be significantly reduced during the transportation process of the cooling machine and the conveying screw. The material temperature is generally 45-50℃; the material is sent to the charging rotary screw through the hanging conveying system for further cooling and charging, and the charging temperature is generally less than 40℃.

[0084] It can be seen that the material temperature and charge temperature during the material transportation process are significantly lower than the thermal decomposition temperature of the improved expanded ammonium nitrate explosive, which is 250.9°C. Therefore, the improved expanded ammonium nitrate explosive with functional additives cannot reach its thermal decomposition temperature in the spiral transportation and mixing process with three-way water cooling function and the charge rotary cooling spiral, and is not prone to thermal decomposition, leading to the occurrence of accidents.

[0085] 2.3 Mechanical sensitivity test

[0086] The impact sensitivity is tested according to the method specified in WJ / T9052.2, and the friction sensitivity is tested according to the method specified in WJ / T9052.1.

[0087] The mechanical sensitivity of the improved expanded ammonium nitrate explosive in the experimental group with 10% functional additives added is as follows: impact sensitivity 1%; friction sensitivity 2%.

[0088] The test results of mechanical sensitivity meet the requirements of General Technical Conditions for Industrial Explosives GB 28286-2012.

[0089] 2.4 Conclusion

[0090] The results of thermal decomposition test and mechanical sensitivity test show that the thermal decomposition temperature of the improved expanded explosive is significantly higher than the material temperature and charging temperature during material transportation, and thermal decomposition is not easy to occur; its mechanical sensitivity meets the requirements of GB 28286-2012, and the functional additive can be safely used in expanded ammonium nitrate explosives.

[0091] 3 Study on the detonation performance of improved liquid-mixed expanded ammonium nitrate explosive

[0092] According to the classic zero oxygen balance formula of expanded ammonium nitrate explosive, ammonium nitrate: wood powder: oil phase = 92:4:4, functional additives in different proportions were added and mixed evenly in a continuous mixing and cooling system to obtain an improved liquid-mixed expanded ammonium nitrate explosive. 32mm paper tubes were used for charging, and the detonation velocity and sympathetic detonation distance were tested according to the test conditions specified in GB28286. The specific results are shown in Table 2.

[0093] Table 2 Detonation performance test results of improved expanded ammonium nitrate explosives

[0094]

[0095] According to the test results, compared with the basic formula without functional additives, as the amount of functional additives added increases, the detonation velocity and intensity are reduced, while the detonation distance remains stable without significant reduction. The main reason is that the functional additives are inert substances and do not participate in the detonation reaction, resulting in a decrease in detonation performance, but the detonation performance still meets the requirements of GB28286-2012.

[0096] 4 Test on bulk density and flowability of improved liquid-mixed expanded ammonium nitrate explosive

[0097] The fluidity and bulk density of the improved liquid-mixed expanded ammonium nitrate explosive were tested. The samples tested were from the same batch as the detonation performance test to ensure the consistency of performance. The test results are shown in Table 3.

[0098] Table 3 Test results of bulk density and flowability of improved expanded ammonium nitrate explosives

[0099]

[0100] As shown in Table 3, compared with ordinary expanded ammonium nitrate explosives, as the functional additive content increases, the bulk density of the explosive is improved by 6-16%, and the flowability is greatly improved by 18-50%, indicating that heavy calcium carbonate is an effective functional additive for improving the physical properties of expanded ammonium nitrate explosives.

[0101] 5 Comparison of economic and environmental benefits

[0102] 5.1 Economic Benefits

[0103] Calculated at 30kg / bag, the cost comparison of expanded ammonium nitrate explosive and improved expanded ammonium nitrate explosive is shown in Table 4.

[0104] Table 4 Comparison of unit costs of expanded ammonium nitrate explosives

[0105]

[0106] By developing functional additives suitable for improving the performance of raw liquid mixed expanded ammonium nitrate explosives, the application of new technologies not only improves product quality, but also enhances product safety and applicability, while reducing production costs and bringing good economic benefits.

[0107] 5.2 Environmental Benefits

[0108] The selected heavy calcium carbonate functional additive is non-toxic, tasteless, odorless, and does not release volatile gases, which realizes the green production of powdered industrial explosives without generating new wastewater, waste gas, and solid waste. The toxic gas content meets the requirements of GB28286-2012 "General Technical Conditions for Industrial Explosives". The toxic gas detection values ​​of the two products submitted for inspection are 31L / kg and 32L / kg respectively, which are far less than the requirement of 70L / kg stipulated in GB28286.

[0109] Although the present invention has been described in detail above by means of general description, specific implementation methods and experiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. An improved liquid-mixed expanded ammonium nitrate explosive, characterized in that: The invention comprises the following components: 91-93 parts of ammonium nitrate, 1.16-2.25 parts of engine oil, 1.75-3 parts of vaseline, 3.5-4.5 parts of wood powder, 0.12-0.15 parts of swelling agent and 5-15 parts of functional additives.

2. The improved liquid-mixed expanded ammonium nitrate explosive according to claim 1, characterized in that: The invention comprises the following components: 91.5-92.5 parts of ammonium nitrate, 1.5-2.0 parts of engine oil, 2.0-2.5 parts of vaseline, 3.75-4.25 parts of wood powder, 0.13-0.14 parts of swelling agent and 8-12 parts of functional additives.

3. The improved liquid-mixed expanded ammonium nitrate explosive according to claim 1, characterized in that: The invention comprises the following components: 92 parts of ammonium nitrate, 2 parts of engine oil, 2 parts of vaseline, 4 parts of wood powder, 0.13 parts of swelling agent and 10 parts of functional additives.

4. The improved liquid-mixed expanded ammonium nitrate explosive according to any one of claims 1 to 3, characterized in that: The functional additive is any one of calcined lime, heavy calcium carbonate and marble powder.

5. The improved liquid-mixed expanded ammonium nitrate explosive according to claim 4, characterized in that: The functional additive is heavy calcium carbonate.

6. A method for preparing an improved liquid-mixed expanded ammonium nitrate explosive, characterized in that: The steps include: S1 Water and oil phase preparation and storage: The ammonium nitrate aqueous solution is pumped into the water phase preparation tank in the water-oil phase preparation workshop, water is added to prepare the water phase, the prepared water phase is pumped to the water phase storage tank in the expanded ammonium nitrate explosive pharmaceutical workshop for standby use, the oil phase is transported to the preparation tank in the oil phase preparation workshop by a tank truck for melting and heat preservation, and then transported to the oil phase storage tank in the expanded ammonium nitrate explosive pharmaceutical workshop for standby use; S2 Dynamic mixing and puffing: water and oil phase solutions are metered and pumped into the mixer for mixing and then enter the puffing crystallizer for continuous puffing to obtain a uniform powdered ammonium oil mixture; S3 Mixing and conveying: According to the process formula requirements, the wood powder and functional additives are mixed with expanded ammonium nitrate through their respective material conveying screws. The mixed expanded ammonium nitrate explosive is crushed by a pulverizer, mixed and cooled by a mixer and a cooling screw, and then transported to the charging and packaging workshop through a material conveying system for charging and packaging; S4 Charging, packaging and finished product transfer: The semi-finished products of expanded ammonium nitrate explosives are transported by the material conveying system to the second-floor hopper of the charging and packaging workshop, and then sent to the charging and packaging station by the material conveying screw. After being bagged by the packaging machine, they are sent to the finished product transfer platform through the product conveyor belt and loaded by the platform robot.

7. The method for preparing the improved liquid-mixed expanded ammonium nitrate explosive according to claim 6, characterized in that: In step S1, water and oil phases are prepared and stored. The ammonium nitrate aqueous solution is pumped into the water phase preparation tank in the water-oil phase preparation workshop, and water is added to prepare the water phase so that the ammonium nitrate concentration is 91% to 93%. The prepared water phase is pumped to the water phase storage tank in the expanded ammonium nitrate explosive pharmaceutical workshop for standby use.

8. The method for preparing the improved liquid-mixed expanded ammonium nitrate explosive according to claim 6, characterized in that: The water and oil phases in step S1 are prepared and stored. The composite oil phase is prepared by compounding engine oil with additives, wherein the additive is vaseline, which is heated to 85-95° C. in a ratio of 1:1-1:2 and kept warm until completely melted, and kept warm for later use.

9. The method for preparing the improved liquid-mixed expanded ammonium nitrate explosive according to claim 8, characterized in that: The water and oil phases in step S1 are prepared and stored. The oil phase is prepared by mixing engine oil with an additive, wherein the additive is vaseline. The mixture is heated to 90° C. in a ratio of 1:1 and kept warm until completely melted, and then kept warm at 65° C. for later use.

10. The use of the improved liquid-mixed expanded ammonium nitrate explosive according to claim 1, characterized in that: Its application in blasting construction.

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