CN116178090B - Antifreeze agent for coal-based explosive, low-Wen Meiji-resistant explosive and preparation method of antifreeze agent - Google Patents
Antifreeze agent for coal-based explosive, low-Wen Meiji-resistant explosive and preparation method of antifreeze agent Download PDFInfo
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- CN116178090B CN116178090B CN202310205967.2A CN202310205967A CN116178090B CN 116178090 B CN116178090 B CN 116178090B CN 202310205967 A CN202310205967 A CN 202310205967A CN 116178090 B CN116178090 B CN 116178090B
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- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B23/00—Compositions characterised by non-explosive or non-thermic constituents
- C06B23/009—Wetting agents, hydrophobing agents, dehydrating agents, antistatic additives, viscosity improvers, antiagglomerating agents, grinding agents and other additives for working up
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- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B21/00—Apparatus or methods for working-up explosives, e.g. forming, cutting, drying
- C06B21/0008—Compounding the ingredient
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- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B31/00—Compositions containing an inorganic nitrogen-oxygen salt
- C06B31/28—Compositions containing an inorganic nitrogen-oxygen salt the salt being ammonium nitrate
- C06B31/285—Compositions containing an inorganic nitrogen-oxygen salt the salt being ammonium nitrate with fuel oil, e.g. ANFO-compositions
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- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
- C06B47/00—Compositions in which the components are separately stored until the moment of burning or explosion, e.g. "Sprengel"-type explosives; Suspensions of solid component in a normally non-explosive liquid phase, including a thickened aqueous phase
- C06B47/14—Compositions in which the components are separately stored until the moment of burning or explosion, e.g. "Sprengel"-type explosives; Suspensions of solid component in a normally non-explosive liquid phase, including a thickened aqueous phase comprising a solid component and an aqueous phase
- C06B47/145—Water in oil emulsion type explosives in which a carbonaceous fuel forms the continuous phase
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
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Abstract
The application provides an antifreeze agent for a coal-based explosive, a low-Wen Meiji-resistant explosive and a preparation method thereof. The antifreeze agent for the coal-based explosive comprises 68-94 wt% of nano hydrocarbon fuel, 6-32 wt% of freezing point modifier and 0.5-0.8 wt% of dispersing agent. The low temperature resistant coal-based explosive comprises 5-10wt% of coal-based explosive anti-freezing agent and 90-95wt% of ammonium nitrate. The antifreeze agent for the coal-based explosive provided by the application adopts the nano hydrocarbon fuel, the freezing point regulator and the dispersing agent with specific dosage to be matched with each other, so that the antifreeze agent can replace diesel oil and ammonium nitrate to prepare the coal-based explosive, the coal-based explosive can not be frozen at 0 ℃, even the coal-based explosive still has excellent blasting performance at-32 ℃, the blasting speed is stable, and the application scene of the coal-based explosive is effectively expanded.
Description
Technical Field
The invention relates to the technical field of explosives, in particular to an antifreeze agent for coal-based explosives, a low-Wen Meiji-resistant explosive and a preparation method thereof.
Background
At present, along with the development of social economy, the industrialization progress of China is greatly improved, and industrial ammonium nitrate fuel oil explosive is favored by a plurality of companies. At present, the ammonium nitrate fuel oil explosive has the advantages of good fluidity, no toxicity, good fluidity, no sticking holes, convenient charging and mechanized charging, and is the most common explosive for production and use. Wherein the proportion of the light diesel oil in the porous granular ammonium nitrate fuel oil explosive is generally 5-10%. However, with the increasing shortage of energy sources, the price of light diesel oil is rapidly increased, so that the production cost of the porous granular ammonium nitrate fuel oil explosive is also higher and higher. Therefore, in order to reduce the cost of the ammonium nitrate fuel oil explosive, coal-based fuel oil is used for replacing diesel oil to prepare the coal-based explosive, but the coal-based explosive has poor low temperature resistance and seriously affects the explosion performance at 0 ℃.
In view of this, the present invention has been made.
Disclosure of Invention
The invention mainly aims to provide an antifreeze agent for coal-based explosive, which is used for solving the problems that the low-temperature resistance of coal-based explosive prepared by replacing diesel oil with coal-based slurry in the prior art is poor and the explosion performance is seriously affected at 0 ℃.
In order to achieve the aim, according to one aspect of the invention, the invention provides an antifreeze agent for coal-based explosive, which comprises 68-94% of nano hydrocarbon fuel, 6-32% of freezing point regulator and 0.5-0.8% of dispersing agent by mass percent.
Further, the antifreeze agent for the coal-based explosive comprises 83-90% of nano hydrocarbon fuel, 10-17% of freezing point modifier and 0.5-0.1% of dispersing agent by mass percent.
Further, the freezing point modifier is at least one selected from calcium chloride and ethylene glycol, preferably calcium chloride or a mixture of calcium chloride and ethylene glycol.
Further, the freezing point regulator is a mixture of calcium chloride and glycol, and the mass ratio of the calcium chloride to the glycol is (2-3): 1.
Further, the dispersant is lignin.
Further, the nano hydrocarbon fuel comprises pulverized coal particles and water, the pulverized coal particles are suspended in the water, the viscosity is 220-350 mPa.s, the mass solid content is 45-65%, and the pulverized coal particles D50 are 0.4-1.2 mu m.
According to a second aspect of the invention there is provided a low Wen Meiji resistant explosive comprising, in mass percent, 5 to 10% of any one of the antifreeze agents for coal-based explosives provided in the first aspect, 90 to 95% of ammonium nitrate.
Further, the ammonium nitrate is porous granular ammonium nitrate.
Further, the bulk density of the porous granular ammonium nitrate is 0.73-0.86 g/cm 3, the oil absorption is more than or equal to 7wt%, the particle size distribution of particles with the particle size range of 0.50-2.50 mm is more than or equal to 90% by number, and the ammonium nitrate content is more than or equal to 99.5wt% by dry basis.
According to a third aspect of the present invention there is also provided a method of preparing a low Wen Meiji-resistant explosive as described above, the method comprising: and uniformly mixing the antifreeze agent for the coal-based explosive and ammonium nitrate to obtain the low-resistant Wen Meiji explosive.
According to a fourth aspect of the present invention there is also provided the use of a low Wen Meiji-resistant explosive as described above in strip mine blasting.
By applying the technical scheme of the application, the antifreeze agent for the coal-based explosive provided by the application adopts the nano hydrocarbon fuel, the freezing point modifier and the dispersing agent with specific dosage to be matched with each other, so that the antifreeze agent can replace diesel oil and ammonium nitrate to prepare the coal-based explosive, the coal-based explosive can not be frozen at 0 ℃, even the coal-based explosive still has excellent blasting performance at-32 ℃, the blasting speed is stable, and the application scene of the coal-based explosive is effectively expanded.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The present application will be described in detail with reference to examples.
As analyzed by the background technology of the application, the existing ammonium nitrate fuel oil explosive is mainly prepared from diesel oil and ammonium nitrate, and as the price of the diesel oil is continuously increased, in order to reduce the cost of the ammonium nitrate fuel oil explosive, some researchers propose to prepare the ammonium nitrate fuel oil explosive by adopting coal-based fuel oil to replace diesel oil, but the coal-based explosive has poor low temperature resistance and seriously affects the blasting performance at 0 ℃. In order to solve the problem, the application provides an antifreeze agent for coal-based explosives, a low-Wen Meiji-resistant explosive and a preparation method thereof.
In a first exemplary embodiment of the application, an antifreeze agent for coal-based explosive is provided, which comprises, by mass, 68-94% of nano hydrocarbon fuel, 6-32% of a freezing point regulator, and 0.5-0.8% of a dispersing agent.
By applying the technical scheme of the application, the antifreeze agent for the coal-based explosive provided by the application adopts the nano hydrocarbon fuel, the freezing point modifier and the dispersing agent with specific dosage to be matched with each other, so that the antifreeze agent can replace diesel oil and ammonium nitrate to prepare the coal-based explosive, the coal-based explosive can not be frozen at 0 ℃, even the coal-based explosive still has excellent blasting performance at-32 ℃, the blasting speed is stable, and the application scene of the coal-based explosive is effectively expanded.
In some embodiments of the application, the antifreeze agent for the coal-based explosive has the mass content of 83-90% of nano hydrocarbon fuel, the mass content of the freezing point regulator is 10-17%, the mass content of the dispersing agent is 0.5-0.1%, and the coal-based explosive prepared by mixing diesel oil with ammonium nitrate is replaced by the antifreeze agent for the coal-based explosive, so that the coal-based explosive has more stable blasting performance.
[ Nano Hydrocarbon Fuel ]
The nano hydrocarbon fuel adopted in the anti-freezing agent for the coal-based explosive is coal-based liquid special fuel which is prepared from coal powder particles, water and optional additives through an advanced nanocrystallization treatment process, has the basic particle size of nano level and higher specific surface area and surface activity, and is novel, efficient and clean environment-friendly fuel.
In some embodiments of the application, the nano hydrocarbon fuel has coal powder particles D50 of 0.4-1.2 mu m, viscosity of 220-350 mpa.s (25 ℃), mass solid content of 45-65%, and further is more beneficial to uniformly mixing with a dispersing agent and a freezing point regulator to form an antifreeze agent for the coal-based explosive with moderate viscosity, so that the antifreeze agent is more beneficial to mixing with ammonium nitrate to prepare the low-resistant Wen Meiji explosive. When the mass solid content of the nano hydrocarbon fuel is 45-55%, the formed antifreeze for the coal-based explosive is more beneficial to being mixed with ammonium nitrate to prepare the coal-based explosive with more stable blasting performance. In the nano hydrocarbon fuel, the pulverized coal particles D50 are, for example, 0.4 μm, 0.5 μm, 0.8 μm, 1.0 μm, 1.2 μm or any two values, and the viscosity at 25 ℃ is, for example, 240mpa.s, 248 mpa.s, 250mpa.s, 255mpa.s, 260mpa.s, 270mpa.s, 280mpa.s or any two values; the mass solids content is, for example, 45%, 48%, 50%, 55%, 58%, 60%, 62%, 65% or any two values.
In the anti-freezing agent for the coal-based explosive, the mass content of the hydrocarbon nano fuel is 68%, 70%, 72%, 75%, 78%, 80%, 85%, 90%, 94% or a range of values consisting of any two values.
[ Freezing point modifier ]
The specific type of the above-mentioned freezing point modifier is not limited, and the freezing point modifier may be any one or a mixture of two of calcium chloride and ethylene glycol in order to further reduce the cost of the antifreeze agent for coal-based explosive and improve the low temperature resistance of the coal-based explosive. When the freezing point regulator is calcium chloride or a mixture of calcium chloride and ethylene glycol, the coal-based explosive prepared by mixing the freezing point regulator with ammonium nitrate has more excellent low temperature resistance and can be used even at-32 ℃.
When the freezing point modifier is the mixture of calcium chloride and glycol, the mass ratio of the calcium chloride to the glycol is (2-3): 1, the mixture is more favorable for being mixed with nano hydrocarbon fuel and a dispersing agent to form the antifreeze for the coal-based explosive with moderate viscosity, and further the antifreeze is more favorable for being mixed with ammonium nitrate to prepare the coal-based explosive with low temperature resistance.
In the antifreeze for the coal-based explosive, the mass content of the freezing point modifier is, for example, 6%, 8%, 10%, 12%, 15%, 20%, 25%, 30%, 32% or any two values.
[ Dispersant ]
In the antifreeze agent for the coal-based explosive, the dispersing agent not only can enhance the mixing uniformity of the freezing point regulator and the nano hydrocarbon fuel, but also can promote the dispersion of pulverized coal particles in the nano hydrocarbon nano fuel to be more uniform, so that the antifreeze agent with moderate viscosity and stable dispersion for the coal-based explosive is formed, and the antifreeze agent is more beneficial to forming a low-resistant Wen Meiji explosive with stable performance when being mixed with ammonium nitrate later.
The specific type of the dispersant is not particularly limited, and lignin is preferable as the dispersant from the viewpoints of cost reduction and promotion of dispersion efficiency of the antifreeze for coal-based explosives.
In the antifreeze agent for the coal-based explosive, the mass content of the dispersing agent is 0.5 per mill, 0.55 per mill, 0.6 per mill, 0.65 per mill, 0.7 per mill, 0.8 per mill, 0.9 per mill, 0.1 percent, 0.2 percent, 0.5 percent, 0.8 percent or a range value formed by any two values.
The antifreeze agent for the coal-based explosive is prepared by the following steps: and uniformly mixing the nano hydrocarbon fuel and the freezing point modifier, and then adding a dispersing agent to uniformly mix, so as to prepare the antifreeze for the coal-based explosive, which is stable in dispersion and reduces the occurrence of sedimentation layering phenomenon. Preferably, the nano hydrocarbon fuel and the freezing point modifier are fully stirred by a low-speed shearing machine at the speed of 120-380 r/min, and the mixing and stirring time is 15-25 min, so that the nano hydrocarbon fuel and the freezing point modifier are more favorably and uniformly mixed. In order to better mix the freezing point regulator with the nano hydrocarbon fuel and prevent sedimentation and layering, a dispersing agent is added into the mixture of the nano hydrocarbon fuel and the freezing point regulator and is mixed by an ultrafine jet mill. Especially when the main engine of the superfine jet mill is controlled to rotate at 1500-1800 r/min, the feeding pressure is 0.6-0.8 MPa, the flow is 1.5-1.8 tons/hour, the preparation of the antifreeze agent for the coal-based explosive with moderate viscosity and no sedimentation and layering is facilitated.
In a second exemplary embodiment of the present application, there is also provided a low Wen Meiji-resistant explosive, the low temperature resistant coal-based explosive comprising, by mass percent, 5-10% of any one of the antifreeze agents for coal-based explosives provided in the first exemplary embodiment, and 90-95% of ammonium nitrate. In the low-temperature-resistant coal-based explosive provided by the application, the mass content of the antifreeze agent for the coal-based explosive is 5%, 8%, 10% or a range value consisting of any two values; the mass content of ammonium nitrate is, for example, 90%, 92%, 95% or any two values.
The low-resistant Wen Meiji explosive provided by the application adopts the antifreeze agent for the coal-based explosive to replace diesel oil and ammonium nitrate to prepare the low-resistant Wen Meiji explosive in a matched manner, so that the cost of the coal-based explosive is reduced, the raw material range of the coal-based explosive is widened, the dependence of industrial explosive on petroleum-based fuel is broken, the coal-based explosive cannot be frozen at 0 ℃, and even the coal-based explosive still has excellent blasting performance at-32 ℃, the blasting speed is stable, and the application scene of the coal-based explosive is effectively expanded.
In order to facilitate the preparation and obtain the low-Wen Meiji explosive with stable performance and convenient filling, the ammonium nitrate is preferably porous granular ammonium nitrate. Further preferably, the bulk density of the porous granular ammonium nitrate is 0.73 to 0.86g/cm 3, the oil absorption is not less than 7% by weight, the particle size distribution of particles with the particle size range of 0.50 to 2.50mm by number is not less than 90%, and the ammonium nitrate content by dry basis is not less than 99.5% by weight.
In a third exemplary embodiment of the present application, there is also provided a method for preparing the above low Wen Meiji-resistant explosive, the method comprising: and uniformly mixing the antifreeze agent for the coal-based explosive and ammonium nitrate to obtain the low-resistant Wen Meiji explosive. The preparation method has simple process and easy operation, is beneficial to large-scale production, and further reduces the growth cost.
The mixing process can be carried out by adding and stirring simultaneously, so that the mixing efficiency is improved.
In a fourth exemplary embodiment of the present application, there is also provided the use of the low Wen Meiji-resistant explosive described above in strip mine blasting.
Such strip mine blasting includes, but is not limited to, rock loosening blasting or throwing blasting.
The strip mine blasting includes differential blasting.
The technical effects of the present application will be further described below with reference to examples and comparative examples.
Examples 1 to 5
Examples 1 to 5 respectively provide a coal-based anti-freezing agent for a explosive, which consists of nano hydrocarbon fuel, calcium chloride and lignin, wherein the mass content of each raw material is shown in the following table 1. The nano hydrocarbon fuel comprises pulverized coal particles and water, wherein the pulverized coal particles are suspended and dispersed in the water, the D50 of the pulverized coal particles is 0.8+/-0.2 mu m, and the mass solid content is 50%.
The preparation method comprises the following steps: adding calcium chloride into nano hydrocarbon fuel, fully stirring for 20min by a low-speed shearing machine, adding lignin, mixing by a superfine jet mill, controlling the rotating speed of a main machine of the superfine jet mill to 1800r/min, and controlling the feeding pressure to 0.8MPa and the flow to 1.5 tons/h.
Comparative example 1
This comparative example provides a nano hydrocarbon fuel that is the same as the nano hydrocarbon fuel in example 1.
The viscosity and freezing point of the antifreeze for coal-based explosive provided in examples 1 to 5 and comparative example 1 were measured, and the results are shown in Table 1.
Wherein, (1) the viscosity test method is as follows: the shear rate at the time of measurement is expressed in terms of an apparent viscosity in millipascal seconds (mPa.s) subscript at a shear rate of 100s -1 (according to the standard GB/T188564-2008).
(2) The freezing point testing method comprises the following steps: the measurement was performed using a freezing point measuring instrument (according to SH/T0090 standard).
TABLE 1
Examples 6 to 9
Examples 6 to 9 respectively provide a coal-based anti-freezing agent for a explosive, which consists of nano hydrocarbon fuel, ethylene glycol and lignin, wherein the mass content of each raw material is shown in the following table 2. The nano hydrocarbon fuel is the same as the nano hydrocarbon fuel in embodiment 1, and the preparation method thereof is also the same as embodiment 1, and is not described herein.
The viscosity and freezing point of the antifreeze for coal-based explosive provided in examples 6 to 9 were respectively measured, and the results are shown in Table 2.
TABLE 2
Examples 10 to 13
Examples 10 to 13 respectively provide a coal-based anti-freezing agent for a explosive, which consists of a mixture of nano hydrocarbon fuel, calcium chloride and ethylene glycol (the mass ratio of the nano hydrocarbon fuel to the calcium chloride is 2:1) and lignin, wherein the mass content of each raw material is shown in the following table 3. The nano hydrocarbon fuel is the same as the nano hydrocarbon fuel in embodiment 1, and the preparation method thereof is also the same as embodiment 1, and is not described herein.
The viscosity and freezing point of the antifreeze for coal-based explosive provided in examples 10 to 13 were respectively measured, and the results are shown in Table 3.
TABLE 3 Table 3
As can be seen from comparing the data in tables 1 to 3, the freezing point of the anti-freezing agent for the coal-based explosive prepared by adopting calcium chloride as the freezing point regulator can be reduced to minus 32 ℃, but the viscosity of the anti-freezing agent for the coal-based explosive is obviously improved along with the increase of the mass content of the calcium chloride, so that the dispersion stability of the anti-freezing agent is reduced, and the difficulty of subsequent mixing with ammonium nitrate is increased.
The freezing point of the antifreeze for the coal-based explosive prepared by adopting the ethylene glycol as the freezing point regulator is reduced along with the increase of the consumption of the ethylene glycol, when the mass content of the ethylene glycol is increased to 32%, the freezing point of the antifreeze is reduced to-32 ℃, the viscosity is reduced to 150mpa.s, the dispersion stability of the antifreeze is poor due to the excessively low viscosity, obvious layering phenomenon can appear after long-time placement, and the subsequent mixing with ammonium nitrate is not facilitated to prepare the coal-based explosive. Meanwhile, the mass content of the ethylene glycol is too high, and the mass content of the nano hydrocarbon fuel is reduced, so that the blasting power of the coal-based explosive prepared later is reduced.
When the mass content of the mixture of calcium chloride and glycol is 17%, the freezing point of the antifreeze for the coal-based explosive can be reduced to-32 ℃, and meanwhile, the viscosity of the antifreeze is moderate, so that the antifreeze is more beneficial to the subsequent preparation of the coal-based explosive with stable performance by being matched with ammonium nitrate.
Example 14
This example differs from example 13 in that the mass solids content of the nano hydrocarbon fuel employed is 45%.
Example 15
This example differs from example 13 in that the mass solids content of the nano hydrocarbon fuel employed is 65%.
The viscosity and freezing point of the antifreeze for coal-based explosive provided in examples 14 to 15 were respectively measured, and the results are shown in Table 4.
TABLE 4 Table 4
| Viscosity (mpa.s) | Freezing point (DEG C) | |
| Example 14 | 308 | -30 |
| Example 15 | 325 | -36 |
Examples 16 to 20
Examples 16 to 20 respectively provide a coal-based explosive which is prepared from the antifreeze agent for coal-based explosive provided in examples 11 to 15 and porous granular ammonium nitrate, wherein the mass content of the antifreeze agent is 6%, the mass content of the porous granular ammonium nitrate is 94%, the bulk density of the porous granular ammonium nitrate is 0.73-0.86 g/cm 3, the oil absorption is not less than 7wt%, the particle size distribution of particles with the particle size range of 0.50-2.50 mm is not less than 90%, and the ammonium nitrate content is not less than 99.5wt% on a dry basis.
The preparation method comprises the following steps: and uniformly mixing the antifreeze agent and the porous granular ammonium nitrate to obtain the coal-based explosive.
Example 21
The embodiment provides a coal-based explosive, which is prepared from the antifreeze agent for the coal-based explosive provided in the embodiment 13 and porous granular ammonium nitrate, wherein the mass content of the antifreeze agent is 5%, and the mass content of the porous granular ammonium nitrate is 95%.
Example 22
The embodiment provides a coal-based explosive, which is prepared from the antifreeze agent for the coal-based explosive provided in the embodiment 13 and porous granular ammonium nitrate, wherein the mass content of the antifreeze agent is 10%, and the mass content of the porous granular ammonium nitrate is 90%.
Test example 1
The freezing point, the explosion velocity and the sensitivity of the coal-based explosives provided in examples 16 to 22 were measured, respectively, and the results are shown in table 5 below.
Wherein, (1) the freezing point test method is as the preparation method of antifreeze for the former coal-based explosive;
(2) The test method of the explosion speed comprises the following steps: the detonation velocity of the explosive is calculated by measuring the time of detonation wave passing through the explosive with a certain length by using a detonating cord with known detonation velocity. The electronic equipment such as oscilloscopes or timers is a measurement method which is commonly used at present, and is an intelligent five-section explosion velocity instrument, and the model is a BC202 type electronic time measuring instrument.
(3) Detonator sensitivity was determined as follows: and (3) adopting PVC pipe with the diameter of 150mm to connect the sample, then conveying the sample to a test field, inserting an industrial detonator No. 8 into the sample, detonating the detonator by using a detonator, and exploding the detonator to see whether the explosive is detonated by the detonator, wherein if the explosive is not detonated by the detonator, the explosive has no detonator sensitivity.
TABLE 5
From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects: the antifreeze agent for the coal-based explosive provided by the application adopts the nano hydrocarbon fuel, the freezing point regulator and the dispersing agent with specific dosage to be matched with each other, so that the antifreeze agent can replace diesel oil and ammonium nitrate to prepare the coal-based explosive, the coal-based explosive can not be frozen at 0 ℃, even the coal-based explosive still has excellent blasting performance at-32 ℃, the blasting speed is stable, and the application scene of the coal-based explosive is effectively expanded.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The antifreeze for the coal-based explosive is characterized by comprising, by mass, 68-94% of nano hydrocarbon fuel, 6-32% of a freezing point regulator and 0.5-0.8% of a dispersing agent; the freezing point regulator is a mixture of calcium chloride and glycol, and the mass ratio of the calcium chloride to the glycol is (2-3) 1.
2. The antifreeze for the coal-based explosive according to claim 1, wherein the antifreeze for the coal-based explosive comprises 83 to 90% of the nano hydrocarbon fuel, 10 to 17% of the freezing point regulator and 0.5 to 0.1% of the dispersing agent in percentage by mass.
3. The antifreeze for coal-based explosive applications of claim 1, wherein the dispersant is lignin.
4. A coal-based explosive antifreeze agent according to any one of claims 1 to 3, wherein the nano hydrocarbon fuel comprises coal dust particles and water, the coal dust particles are suspended in the water, the viscosity is 220 to 350mpa.s, the mass solids content is 45 to 65%, and the coal dust particles D50 is 0.4 to 1.2 μm.
5. A low-temperature resistant Wen Meiji explosive, characterized in that the low-temperature resistant coal-based explosive comprises 5-10% of the antifreeze for coal-based explosives in any one of claims 1-4 and 90-95% of ammonium nitrate in mass percent.
6. The low-resistant Wen Meiji explosive of claim 5 wherein the ammonium nitrate is porous granular ammonium nitrate.
7. The low-Wen Meiji explosive according to claim 6, wherein,
The bulk density of the porous granular ammonium nitrate is 0.73-0.86 g/cm 3, the oil absorption rate is more than or equal to 7wt%, the particle size distribution of particles with the particle size range of 0.50-2.50 mm is more than or equal to 90%, and the ammonium nitrate content is more than or equal to 99.5wt% on a dry basis.
8. A method of preparing a low Wen Meiji-resistant explosive as defined in any one of claims 5 to 7, the method comprising: and uniformly mixing the antifreeze agent for the coal-based explosive and the ammonium nitrate to obtain the low-resistant Wen Meiji explosive.
9. Use of a low Wen Meiji-resistant explosive as defined in any one of claims 5 to 7 in strip mine blasting.
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