Formula and preparation method of underground mine blasting mixed emulsion explosive

Abstract

The invention relates to the technical field of emulsion explosives, and particularly discloses a formula and a preparation method of an underground mine blasting mixed emulsion explosive. The underground mine blasting mixed emulsion explosive comprises the following components in percentage by mass: 73-78% of ammonium nitrate, 3-5% of sodium nitrate, 0.2-0.4% of thiourea, 2-5% of an oil phase component, 1-3% of a compound emulsifier, 0.3-0.5% of a sensitizer, 0.8-1.5% of hollow glass balls and the balance of water, the compound emulsifier is composed of sorbitan monooleate, polyisobutylene succinimide and soya bean lecithin, and the sensitizer is composed of ethanolamine nitrate and phosphoric acid; according to the invention, by optimizing the proportion of each component, adopting an efficient emulsification process under a mild condition and synergistically optimizing each component, the product has good explosion performance and safety and can adapt to different mine environments, meanwhile, the stability of the emulsion explosive in a low-temperature environment is ensured, and the problem of miss-fire explosion in winter is effectively overcome.

Description

Technical Field

[0001] The invention relates to the technical field of emulsion explosive preparation, and more specifically, to a formula and a preparation method of mixed emulsion explosive for underground mine blasting. Background Art

[0002] In the field of modern mining engineering, blasting operations are an important part of mineral resource mining. With the continuous development and technological evolution of the mining industry, higher requirements are put forward for the safety, efficiency and environmental performance of blasting materials. As an efficient industrial explosive, emulsion explosives are widely used in underground mine blasting operations due to their excellent explosive performance, good storage stability and relatively safe operating characteristics. Emulsion explosives are prepared based on the principle of oil-in-water emulsions, with oxidant solution as the dispersed phase-inner phase and fuel oil as the continuous phase-outer phase. At the same time, they contain emulsifiers and other additives to enhance their physical and chemical properties. This structure gives it unique performance advantages such as high density, strong water resistance, good sensitivity control and low sensitivity, which significantly improves the safety during use. Existing emulsion explosive products have outstanding advantages in practical applications, with high energy output, can effectively break hard rocks and improve blasting efficiency. Its good water resistance enables it to maintain stable performance even in humid environments. Compared with traditional explosives, emulsion explosives have lower manufacturing costs and less environmental impact, which conforms to the modern green production concept.

[0003] However, the emulsion explosives under the existing technology still have shortcomings. Under specific geological conditions, the traditional emulsion explosive formula cannot meet the complex underground mine blasting requirements. Its preparation process is complicated, requiring strict temperature control and a long mixing time, resulting in low production efficiency. In low temperature environments, the stability is greatly reduced, and winter explosion refusal often occurs, which seriously interferes with the normal mining operation progress of the mine, causing economic losses and a series of safety management problems. Therefore, the present invention provides a formula and preparation method of mixed emulsion explosives for underground mine blasting to solve the above problems. Summary of the invention

[0004] The invention provides a formula and a preparation method of a mixed emulsion explosive for underground mine blasting. The prepared emulsion explosive has good explosion performance and safety and can adapt to different mine environments. At the same time, the stability of the emulsion explosive in a low-temperature environment is ensured, and the problem of explosion refusal in winter is effectively overcome.

[0005] The present invention provides a mixed emulsion explosive for underground mine blasting, which adopts the following technical solution:

[0006] A mixed emulsion explosive for underground mine blasting is prepared from the following raw material components by mass: 73-78% ammonium nitrate, 3-5% sodium nitrate, 0.2-0.4% thiourea, 2-5% oil phase component, 1-3% composite emulsifier, 0.3-0.5% sensitizer and 0.8-1.5% hollow glass ball, and the rest is water;

[0007] The preparation method comprises the following steps:

[0008] A1. Dissolve ammonium nitrate, sodium nitrate and thiourea in water, and stir continuously at 80-90°C for 5-10 minutes to obtain an aqueous solution;

[0009] A2. Under stirring, add the heat-insulated oil phase component to the aqueous phase solution preheated to 70-80°C, and at the same time drop the composite emulsifier, continue stirring for 15-30 minutes, then cool to 40-50°C, and then add the sensitizer and hollow glass balls under stirring, continue stirring for 15-30 minutes to obtain the mixed emulsion explosive for underground mine blasting.

[0010] Preferably, the underground mine blasting mixed emulsion explosive is made of the following raw material components in parts by mass: 76% ammonium nitrate, 4% sodium nitrate, 0.4% thiourea, 4% oil phase component, 2% composite emulsifier, 0.4% sensitizer and 1.4% hollow glass balls, and the rest is water.

[0011] Preferably, the oil phase components are composed of diesel, engine oil, vaseline and fully refined paraffin in a mass ratio of 5-8:2-4:1-3:0.5-1.

[0012] Preferably, the composite emulsifier is composed of sorbitan monooleate, polyisobutylene succinimide and soybean lecithin in a mass ratio of 7-10:3-5:2-4.

[0013] Preferably, the sensitizer consists of nitrate ethanolamine and phosphoric acid in a mass ratio of 14-17:3-6.

[0014] Preferably, the preparation method of the oil phase component comprises the following steps: continuously stirring diesel, engine oil, vaseline and fully refined paraffin at 70-80° C. for 20-40 minutes to obtain a uniformly mixed oil phase component, and keeping it warm for later use.

[0015] Preferably, the preparation method of the composite emulsifier comprises the following steps: stirring sorbitan monooleate, polyisobutylene succinimide and soybean lecithin at 50-60° C. for 15-30 min to obtain a uniformly mixed composite emulsifier, and keeping the mixture warm for later use.

[0016] In summary, the present invention has the following beneficial effects:

[0017] 1. The underground mine blasting mixed emulsion explosive of the present invention is prepared from ammonium nitrate, sodium nitrate, thiourea, oil phase components, composite emulsifiers, sensitizers and hollow glass balls as raw materials. By optimizing the proportions between the various components, the emulsion explosive has a higher energy density and stable explosion characteristics, ensuring that sufficient energy can be released during detonation, and can effectively overcome the problem of winter implosion of the emulsion explosive. At the same time, due to the presence of thiourea, the gas generation of the explosion product can be effectively improved, thereby improving the blasting efficiency.

[0018] 2. The oil phase components of the present invention are composed of diesel, engine oil, vaseline and fully refined paraffin. The fluidity of diesel and engine oil is balanced with the high viscosity of vaseline and fully refined paraffin, so that the oil phase components have good fluidity to facilitate the emulsification process and sufficient viscosity to meet the plasticity and deformation resistance requirements of the explosive; their waterproof properties are also superimposed on each other to form an effective waterproof barrier to prevent moisture from damaging the explosive; in terms of energy release, the hydrocarbon structures of each component interact with each other during the explosion process to jointly regulate the energy output of the explosive, so that the emulsion explosive can better adapt to the complex needs of underground mine blasting.

[0019] 3. The composite emulsifier of the present invention is composed of sorbitan monooleate, polyisobutylene succinimide and soybean lecithin. The surface activity of sorbitan monooleate and soybean lecithin can be combined with the dispersing emulsification and steric hindrance of polyisobutylene succinimide to ensure the uniform distribution of the components of the explosive in the emulsified system, so that the emulsified explosive can release energy more evenly during the detonation process. They act together on the oil-water interface to improve the emulsification effect and the stability of the emulsified system by reducing surface tension, forming a protective film, providing steric hindrance and other methods.

[0020] 4. The sensitizer of the present invention is composed of nitrate ethanolamine and phosphoric acid. The regulating effect of phosphoric acid on the chemical activity of nitrate ethanolamine enables the sensitization function of nitrate ethanolamine to be accurately exerted, which not only ensures that the explosive has sufficient sensitivity, but also avoids the poor stability of the explosive due to excessive activity. The hollow glass balls are evenly dispersed in the emulsified structure composed of the oil phase and the water phase, and can be filled in the gaps between other components, making the structure of the explosive more compact and stable. At the same time, it can adsorb some components in the emulsion explosive on its surface, further strengthening the connection between the components, thereby improving the overall stability of the explosive, and in the energy release process, it can better cooperate with other components to optimize the performance of the entire explosive system. DETAILED DESCRIPTION

[0021] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The experimental methods in the following examples are conventional methods unless otherwise specified, and the experimental materials used are purchased from conventional biochemical reagent stores unless otherwise specified. The quantitative tests in the following examples were repeated three times, and the data are the average or average ± standard deviation of the three repeated experiments.

[0023] Example 1

[0024] The present embodiment provides a mixed emulsion explosive for underground mine blasting, which is made of the following raw material components in parts by mass: 73% ammonium nitrate, 3% sodium nitrate, 0.2% thiourea, 2% oil phase component, 1% composite emulsifier, 0.3% sensitizer and 0.8% hollow glass balls, and the rest is water, wherein the oil phase component is composed of diesel, engine oil, vaseline and fully refined paraffin in a mass ratio of 5:2:1:0.5, the composite emulsifier is composed of sorbitan monooleate, polyisobutylene succinimide and soybean lecithin in a mass ratio of 7:3:2, and the sensitizer is composed of nitroethanolamine and phosphoric acid in a mass ratio of 14:3.

[0025] The preparation method of the oil phase component is as follows: the stirring speed is controlled to be 300 rpm, diesel, engine oil, vaseline and fully refined paraffin are continuously stirred at 70° C. for 40 minutes to obtain a uniformly mixed oil phase component, and the mixture is kept warm for later use.

[0026] The preparation method of the composite emulsifier is as follows: the stirring speed is controlled to be 200 rpm, sorbitan monooleate, polyisobutylene succinimide and soybean lecithin are continuously stirred at 50° C. for 30 minutes to obtain a uniformly mixed composite emulsifier, and the mixture is kept warm for later use.

[0027] The preparation method of mixed emulsion explosive for underground mine blasting is as follows:

[0028] A1. Dissolve ammonium nitrate, sodium nitrate and thiourea in water, control the stirring speed to 500 rpm, and continue stirring at 80° C. for 10 min to obtain an aqueous phase solution;

[0029] A2. Under the stirring speed of 3000 rpm, the heat-insulated oil phase component is added to the aqueous phase solution preheated to 70°C, and the composite emulsifier is added dropwise at a rate of 1 ml / min. After continuous stirring for 30 min, the mixture is cooled to 40°C, and then a sensitizer and hollow glass balls are added. After continuous stirring for 30 min at a stirring speed of 500 rpm, a mixed emulsion explosive for underground mine blasting is obtained.

[0030] Example 2

[0031] The present embodiment provides a mixed emulsion explosive for underground mine blasting, which is made of the following raw material components in parts by mass: 75% ammonium nitrate, 3.5% sodium nitrate, 0.3% thiourea, 3% oil phase component, 1.8% composite emulsifier, 0.44% sensitizer and 1.2% hollow glass balls, and the rest is water, wherein the oil phase component is composed of diesel, engine oil, vaseline and fully refined paraffin in a mass ratio of 6:3:3:0.9, the composite emulsifier is composed of sorbitan monooleate, polyisobutylene succinimide and soybean lecithin in a mass ratio of 9:5:3, and the sensitizer is composed of nitroethanolamine and phosphoric acid in a mass ratio of 15:4.

[0032] The preparation method of the oil phase component is as follows: the stirring speed is controlled to be 350 rpm, diesel, engine oil, vaseline and fully refined paraffin are continuously stirred at 72° C. for 35 minutes to obtain a uniformly mixed oil phase component, and the mixture is kept warm for later use.

[0033] The preparation method of the composite emulsifier is as follows: the stirring speed is controlled to be 250 rpm, sorbitan monooleate, polyisobutylene succinimide and soybean lecithin are continuously stirred at 55° C. for 25 minutes to obtain a uniformly mixed composite emulsifier, and the mixture is kept warm for later use.

[0034] The preparation method of mixed emulsion explosive for underground mine blasting is as follows:

[0035] A1. Dissolve ammonium nitrate, sodium nitrate and thiourea in water, control the stirring speed to 600 rpm, and continue stirring at 85° C. for 8 min to obtain an aqueous phase solution;

[0036] A2. Under the stirring speed of 4000 rpm, the heat-insulated oil phase component is added to the aqueous phase solution preheated to 75°C, and the composite emulsifier is added dropwise at a rate of 2 ml / min. After continuous stirring for 25 minutes, the mixture is cooled to 45°C, and a sensitizer and hollow glass balls are added. After continuous stirring for 25 minutes at a stirring speed of 600 rpm, a mixed emulsion explosive for underground mine blasting is obtained.

[0037] Example 3

[0038] The present embodiment provides a mixed emulsion explosive for underground mine blasting, which is made of the following raw material components in parts by mass: 78% ammonium nitrate, 5% sodium nitrate, 0.4% thiourea, 5% oil phase component, 3% composite emulsifier, 0.5% sensitizer and 1.5% hollow glass balls, and the rest is water, wherein the oil phase component is composed of diesel, engine oil, vaseline and fully refined paraffin in a mass ratio of 8:4:3:1, the composite emulsifier is composed of sorbitan monooleate, polyisobutylene succinimide and soybean lecithin in a mass ratio of 10:5:4, and the sensitizer is composed of nitroethanolamine and phosphoric acid in a mass ratio of 17:6.

[0039] The preparation method of the oil phase component is as follows: the stirring speed is controlled to be 500 rpm, diesel, engine oil, vaseline and fully refined paraffin are continuously stirred at 80° C. for 20 minutes to obtain a uniformly mixed oil phase component, and the mixture is kept warm for later use.

[0040] The preparation method of the composite emulsifier is as follows: the stirring speed is controlled to be 300 rpm, sorbitan monooleate, polyisobutylene succinimide and soybean lecithin are continuously stirred at 60° C. for 15 minutes to obtain a uniformly mixed composite emulsifier, and the mixture is kept warm for later use.

[0041] The preparation method of mixed emulsion explosive for underground mine blasting is as follows:

[0042] A1. Dissolve ammonium nitrate, sodium nitrate and thiourea in water, control the stirring speed to 800 rpm, and continue stirring at 90° C. for 5 min to obtain an aqueous phase solution;

[0043] A2. Under the stirring speed of 5000 rpm, the heat-insulated oil phase component is added to the aqueous phase solution preheated to 80°C, and the composite emulsifier is added dropwise at a rate of 3 ml / min. After continuous stirring for 15 minutes, the mixture is cooled to 50°C, and a sensitizer and hollow glass balls are added. After continuous stirring for 15 minutes at a stirring speed of 800 rpm, a mixed emulsion explosive for underground mine blasting is obtained.

[0044] Example 4

[0045] The present embodiment provides a mixed emulsion explosive for underground mine blasting, which is made of the following raw material components in parts by mass: 76% ammonium nitrate, 4% sodium nitrate, 0.4% thiourea, 4% oil phase component, 2% composite emulsifier, 0.4% sensitizer and 1.4% hollow glass balls, and the rest is water, wherein the oil phase component is composed of diesel, engine oil, vaseline and fully refined paraffin in a mass ratio of 6:3:2:1, the composite emulsifier is composed of sorbitan monooleate, polyisobutylene succinimide and soybean lecithin in a mass ratio of 8:4:3, and the sensitizer is composed of nitroethanolamine and phosphoric acid in a mass ratio of 16:5.

[0046] The preparation method of the oil phase component is as follows: the stirring speed is controlled to be 500 rpm, diesel, engine oil, vaseline and fully refined paraffin are continuously stirred at 80° C. for 20 minutes to obtain a uniformly mixed oil phase component, and the mixture is kept warm for later use.

[0047] The preparation method of the composite emulsifier is as follows: the stirring speed is controlled to be 300 rpm, sorbitan monooleate, polyisobutylene succinimide and soybean lecithin are continuously stirred at 60° C. for 15 minutes to obtain a uniformly mixed composite emulsifier, and the mixture is kept warm for later use.

[0048] The preparation method of mixed emulsion explosive for underground mine blasting is as follows:

[0049] A1. Dissolve ammonium nitrate, sodium nitrate and thiourea in water, control the stirring speed to 800 rpm, and continue stirring at 90° C. for 8 min to obtain an aqueous phase solution;

[0050] A2. Under the stirring speed of 3500 rpm, the heat-insulated oil phase component is added to the aqueous phase solution preheated to 80°C, and the composite emulsifier is added dropwise at a rate of 3 ml / min. After continuous stirring for 18 min, the mixture is cooled to 45°C, and then a sensitizer and hollow glass balls are added. After continuous stirring for 20 min at a stirring speed of 600 rpm, a mixed emulsion explosive for underground mine blasting is obtained.

[0051] Comparative Example 1

[0052] The present embodiment provides a mixed emulsion explosive for underground mine blasting, which is made of the following raw material components in parts by mass: 76% ammonium nitrate, 4% sodium nitrate, 4% oil phase component, 2% composite emulsifier, 0.4% sensitizer and 1.4% hollow glass balls, and the rest is water, wherein the oil phase component is composed of diesel, engine oil, vaseline and fully refined paraffin in a mass ratio of 6:3:2:1, the composite emulsifier is composed of sorbitan monooleate, polyisobutylene succinimide and soybean lecithin in a mass ratio of 8:4:3, and the sensitizer is composed of nitroethanolamine and phosphoric acid in a mass ratio of 16:5.

[0053] The preparation method of the oil phase component is as follows: the stirring speed is controlled to be 500 rpm, diesel, engine oil, vaseline and fully refined paraffin are continuously stirred at 80° C. for 20 minutes to obtain a uniformly mixed oil phase component, and the mixture is kept warm for later use.

[0054] The preparation method of the composite emulsifier is as follows: the stirring speed is controlled to be 300 rpm, sorbitan monooleate, polyisobutylene succinimide and soybean lecithin are continuously stirred at 60° C. for 15 minutes to obtain a uniformly mixed composite emulsifier, and the mixture is kept warm for later use.

[0055] The preparation method of mixed emulsion explosive for underground mine blasting is as follows:

[0056] A1. Dissolve ammonium nitrate and sodium nitrate in water, control the stirring speed to 800 rpm, and continue stirring at 90° C. for 8 min to obtain an aqueous phase solution;

[0057] A2. Under the stirring speed of 3500 rpm, the heat-insulated oil phase component is added to the aqueous phase solution preheated to 80°C, and the composite emulsifier is added dropwise at a rate of 3 ml / min. After continuous stirring for 18 min, the mixture is cooled to 45°C, and then a sensitizer and hollow glass balls are added. After continuous stirring for 20 min at a stirring speed of 600 rpm, a mixed emulsion explosive for underground mine blasting is obtained.

[0058] Comparative Example 2

[0059] The present embodiment provides a mixed emulsion explosive for underground mine blasting, which is made of the following raw material components in parts by mass: 76% ammonium nitrate, 4% sodium nitrate, 0.4% thiourea, 4% oil phase component, 2% composite emulsifier, 0.4% sensitizer and 1.4% hollow glass balls, and the rest is water, wherein the oil phase component is composed of diesel and engine oil in a mass ratio of 6:3, the composite emulsifier is composed of sorbitan monooleate, polyisobutylene succinimide and soybean lecithin in a mass ratio of 8:4:3, and the sensitizer is composed of nitroethanolamine and phosphoric acid in a mass ratio of 16:5.

[0060] The preparation method of the oil phase component is as follows: the stirring speed is controlled to be 500 rpm, diesel and engine oil are continuously stirred at 80° C. for 20 minutes to obtain a uniformly mixed oil phase component, and the mixture is kept warm for later use.

[0061] The preparation method of the composite emulsifier is as follows: the stirring speed is controlled to be 300 rpm, sorbitan monooleate, polyisobutylene succinimide and soybean lecithin are continuously stirred at 60° C. for 15 minutes to obtain a uniformly mixed composite emulsifier, and the mixture is kept warm for later use.

[0062] The preparation method of mixed emulsion explosive for underground mine blasting is as follows:

[0063] A1. Dissolve ammonium nitrate, sodium nitrate and thiourea in water, control the stirring speed to 800 rpm, and continue stirring at 90° C. for 8 min to obtain an aqueous phase solution;

[0064] A2. Under the stirring speed of 3500 rpm, the heat-insulated oil phase component is added to the aqueous phase solution preheated to 80°C, and the composite emulsifier is added dropwise at a rate of 3 ml / min. After continuous stirring for 18 min, the mixture is cooled to 45°C, and then a sensitizer and hollow glass balls are added. After continuous stirring for 20 min at a stirring speed of 600 rpm, a mixed emulsion explosive for underground mine blasting is obtained.

[0065] Comparative Example 3

[0066] The present embodiment provides a mixed emulsion explosive for underground mine blasting, which is made of the following raw material components in parts by mass: 76% ammonium nitrate, 4% sodium nitrate, 0.4% thiourea, 4% oil phase component, 2% composite emulsifier, 0.4% sensitizer and 1.4% hollow glass balls, and the rest is water, wherein the oil phase component is composed of diesel, engine oil, microcrystalline wax and fully refined paraffin in a mass ratio of 6:3:2:1, the composite emulsifier is composed of sorbitan monooleate, polyisobutylene succinimide and soybean lecithin in a mass ratio of 8:4:3, and the sensitizer is composed of nitroethanolamine and phosphoric acid in a mass ratio of 16:5.

[0067] The preparation method of the oil phase component is as follows: the stirring speed is controlled to be 500 rpm, diesel, engine oil, microcrystalline wax and fully refined paraffin are continuously stirred at 80° C. for 20 minutes to obtain a uniformly mixed oil phase component, and the mixture is kept warm for later use.

[0068] The preparation method of the composite emulsifier is as follows: the stirring speed is controlled to be 300 rpm, sorbitan monooleate, polyisobutylene succinimide and soybean lecithin are continuously stirred at 60° C. for 15 minutes to obtain a uniformly mixed composite emulsifier, and the mixture is kept warm for later use.

[0069] The preparation method of mixed emulsion explosive for underground mine blasting is as follows:

[0070] A1. Dissolve ammonium nitrate, sodium nitrate and thiourea in water, control the stirring speed to 800 rpm, and continue stirring at 90° C. for 8 min to obtain an aqueous phase solution;

[0071] A2. Under the stirring speed of 3500 rpm, the heat-insulated oil phase component is added to the aqueous phase solution preheated to 80°C, and the composite emulsifier is added dropwise at a rate of 3 ml / min. After continuous stirring for 18 min, the mixture is cooled to 45°C, and then a sensitizer and hollow glass balls are added. After continuous stirring for 20 min at a stirring speed of 600 rpm, a mixed emulsion explosive for underground mine blasting is obtained.

[0072] Comparative Example 4

[0073] The present embodiment provides a mixed emulsion explosive for underground mine blasting, which is made of the following raw material components in parts by mass: 76% ammonium nitrate, 4% sodium nitrate, 0.4% thiourea, 4% oil phase component, 2% sorbitan monooleate, 0.4% sensitizer and 1.4% hollow glass balls, and the rest is water, wherein the oil phase component is composed of diesel, engine oil, vaseline and fully refined paraffin in a mass ratio of 6:3:2:1, and the sensitizer is composed of nitroethanolamine and phosphoric acid in a mass ratio of 16:5.

[0074] The preparation method of the oil phase component is as follows: the stirring speed is controlled to be 500 rpm, diesel, engine oil, vaseline and fully refined paraffin are continuously stirred at 80° C. for 20 minutes to obtain a uniformly mixed oil phase component, and the mixture is kept warm for later use.

[0075] The preparation method of mixed emulsion explosives for underground mine blasting is:

[0076] A1. Dissolve ammonium nitrate, sodium nitrate and thiourea in water, control the stirring speed to 800 rpm, and continue stirring at 90° C. for 8 min to obtain an aqueous phase solution;

[0077] A2. Under the stirring speed of 3500 rpm, the heat-insulated oil phase component is added to the aqueous phase solution preheated to 80°C, and sorbitan monooleate is added dropwise at a rate of 3 ml / min. After continuous stirring for 18 min, the mixture is cooled to 45°C, and a sensitizer and hollow glass balls are added. After continuous stirring for 20 min at a stirring speed of 600 rpm, a mixed emulsion explosive for underground mine blasting is obtained.

[0078] Comparative Example 5

[0079] The present embodiment provides a mixed emulsion explosive for underground mine blasting, which is made of the following raw material components in parts by mass: 76% ammonium nitrate, 4% sodium nitrate, 0.4% thiourea, 4% oil phase component, 2% composite emulsifier, 0.4% sensitizer and 1.4% hollow glass balls, and the rest is water, wherein the oil phase component is composed of diesel, engine oil, vaseline and fully refined paraffin in a mass ratio of 6:3:2:1, the composite emulsifier is composed of sorbitan monooleate, polyisobutylene succinimide and soybean lecithin in a mass ratio of 8:4:3, and the sensitizer is composed of nitroethanolamine and phosphoric acid in a mass ratio of 1:1.

[0080] The preparation method of the oil phase component is as follows: the stirring speed is controlled to be 500 rpm, diesel, engine oil, vaseline and fully refined paraffin are continuously stirred at 80° C. for 20 minutes to obtain a uniformly mixed oil phase component, and the mixture is kept warm for later use.

[0081] The preparation method of the composite emulsifier is as follows: the stirring speed is controlled to be 300 rpm, sorbitan monooleate, polyisobutylene succinimide and soybean lecithin are continuously stirred at 60° C. for 15 minutes to obtain a uniformly mixed composite emulsifier, and the mixture is kept warm for later use.

[0082] The preparation method of mixed emulsion explosive for underground mine blasting is as follows:

[0083] A1. Dissolve ammonium nitrate, sodium nitrate and thiourea in water, control the stirring speed to 800 rpm, and continue stirring at 90° C. for 8 min to obtain an aqueous phase solution;

[0084] A2. Under the stirring speed of 3500 rpm, the heat-insulated oil phase component is added to the aqueous phase solution preheated to 80°C, and the composite emulsifier is added dropwise at a rate of 3 ml / min. After continuous stirring for 18 min, the mixture is cooled to 45°C, and then a sensitizer and hollow glass balls are added. After continuous stirring for 20 min at a stirring speed of 600 rpm, a mixed emulsion explosive for underground mine blasting is obtained.

[0085] Comparative Example 6

[0086] The present embodiment provides a mixed emulsion explosive for underground mine blasting, which is made of the following raw material components in parts by mass: 76% ammonium nitrate, 4% sodium nitrate, 0.4% thiourea, 4% oil phase component, 2% composite emulsifier and 0.4% sensitizer, and the rest is water, wherein the oil phase component is composed of diesel, engine oil, vaseline and fully refined paraffin in a mass ratio of 6:3:2:1, the composite emulsifier is composed of sorbitan monooleate, polyisobutylene succinimide and soybean lecithin in a mass ratio of 8:4:3, and the sensitizer is composed of nitroethanolamine and phosphoric acid in a mass ratio of 16:5.

[0087] The preparation method of the oil phase component is as follows: the stirring speed is controlled to be 500 rpm, diesel, engine oil, vaseline and fully refined paraffin are continuously stirred at 80° C. for 20 minutes to obtain a uniformly mixed oil phase component, and the mixture is kept warm for later use.

[0088] The preparation method of the composite emulsifier is as follows: the stirring speed is controlled to be 300 rpm, sorbitan monooleate, polyisobutylene succinimide and soybean lecithin are continuously stirred at 60° C. for 15 minutes to obtain a uniformly mixed composite emulsifier, and the mixture is kept warm for later use.

[0089] The preparation method of mixed emulsion explosive for underground mine blasting is as follows:

[0090] A1. Dissolve ammonium nitrate, sodium nitrate and thiourea in water, control the stirring speed to 800 rpm, and continue stirring at 90° C. for 8 min to obtain an aqueous phase solution;

[0091] A2. Under the stirring speed of 3500 rpm, the heat-insulated oil phase component is added to the aqueous phase solution preheated to 80°C, and the composite emulsifier is added dropwise at a rate of 3 ml / min. After continuous stirring for 18 minutes, the mixture is cooled to 45°C, and a sensitizer is added. After continuous stirring for 20 minutes at a stirring speed of 600 rpm, a mixed emulsion explosive for underground mine blasting is obtained.

[0092] Performance Testing

[0093] The following performance tests were conducted on a mixed emulsion explosive for underground mine blasting prepared in the above experiment:

[0094] 1. Detonation velocity test: The detonation velocity test of mixed emulsion explosives for underground mine blasting was carried out in accordance with GB / T13228-2015 standard. The test results are shown in Table 1.

[0095] 2. Low temperature detonation velocity test: The underground mine blasting mixed emulsion explosives of Examples 1-4 and Comparative Examples 1-6 were placed in a FYL-YS-1028L type low temperature box, the temperature was set at -25 ° C, and the freezing was continued for 5 days. Then, the detonation velocity test was carried out in accordance with GB / T13228-2015 standard. The test results are shown in Table 1.

[0096] 3. Sympathetic detonation distance: The sympathetic detonation distance test of mixed emulsion explosives for underground mine blasting was carried out in accordance with WJ / T9055-2006 standard. The test results are shown in Table 1.

[0097] 4. Stability test: The prepared emulsion explosive is first placed in a 50℃ constant temperature box for 8 hours, and then placed in a -40℃ low temperature box for 16 hours. One cold and one hot cycle is recorded as a high and low temperature cycle. After each cycle, observe whether there is crystal precipitation on the surface of the colloid. Repeat the cycle until the emulsion explosive is destroyed.

[0098] Table 1

[0099]

[0100] From the results shown in Table 1 above, it can be seen that the comprehensive performance of the underground mine blasting mixed emulsion explosives prepared in Examples 1-4 of the present invention is far better than that of Comparative Examples 1-6.

[0101] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A mixed emulsion explosive for underground mine blasting, characterized in that: It is prepared from the following raw material components in parts by mass: 73-78% ammonium nitrate, 3-5% sodium nitrate, 0.2-0.4% thiourea, 2-5% oil phase component, 1-3% composite emulsifier, 0.3-0.5% sensitizer and 0.8-1.5% hollow glass ball, and the rest is water; The preparation method comprises the following steps: A1. Dissolve ammonium nitrate, sodium nitrate and thiourea in water, and stir continuously at 80-90°C for 5-10 minutes to obtain an aqueous solution; A2. Under stirring, add the heat-insulated oil phase component to the aqueous phase solution preheated to 70-80°C, and at the same time drop the composite emulsifier, continue stirring for 15-30 minutes, then cool to 40-50°C, and then add the sensitizer and hollow glass balls under stirring, continue stirring for 15-30 minutes to obtain the mixed emulsion explosive for underground mine blasting.

2. The underground mine blasting mixed emulsion explosive according to claim 1, characterized in that: It is made of the following raw material components in parts by mass: 76% ammonium nitrate, 4% sodium nitrate, 0.4% thiourea, 4% oil phase component, 2% composite emulsifier, 0.4% sensitizer and 1.4% hollow glass ball, and the rest is water.

3. The underground mine blasting mixed emulsion explosive according to claim 1, characterized in that: The oil phase components are composed of diesel, engine oil, vaseline and fully refined paraffin in a mass ratio of 5-8:2-4:1-3:0.5-1.

4. The mixed emulsion explosive for underground mine blasting according to claim 1, characterized in that: The composite emulsifier consists of sorbitan monooleate, polyisobutylene succinimide and soybean lecithin in a mass ratio of 7-10:3-5:2-4.

5. The mixed emulsion explosive for underground mine blasting according to claim 1, characterized in that: The sensitizer consists of nitrate ethanolamine and phosphoric acid in a mass ratio of 14-17:3-6.

6. The mixed emulsion explosive for underground mine blasting according to claim 1, characterized in that: The preparation method of the oil phase component comprises the following steps: continuously stirring diesel, engine oil, vaseline and fully refined paraffin at 70-80°C for 20-40 minutes to obtain a uniformly mixed oil phase component, and keeping it warm for later use.

7. The mixed emulsion explosive for underground mine blasting according to claim 1, characterized in that: The preparation method of the composite emulsifier comprises the following steps: continuously stirring sorbitan monooleate, polyisobutylene succinimide and soybean lecithin at 50-60 DEG C for 15-30 minutes to obtain a uniformly mixed composite emulsifier, and keeping the mixture warm for later use.

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