White-mud-based ammonium nitrate fuel oil explosive inert filler and preparation method thereof, ammonium nitrate fuel oil explosive composition and ammonium nitrate fuel oil explosive

Abstract

The invention provides a white mud-based ammonium nitrate fuel oil explosive inert filler and a preparation method thereof, an ammonium nitrate fuel oil explosive composition and an ammonium nitrate fuel oil explosive. The preparation method comprises the steps that S1, white mud is granulated and screened, precursor particles are obtained, and the white mud is waste residues left after aluminum oxide is extracted from fly ash through a hydrochloric acid leaching method; s2, drying the precursor particles at 100 DEG C or below 100 DEG C to obtain dried particles; and S3, roasting the dried particles to obtain the white mud-based ammonium nitrate fuel oil explosive inert filler. The loose bulk density of the white-mud-based ammonium nitrate fuel oil explosive inert filler prepared by the preparation method is the same as that of porous granular ammonium nitrate, when the white-mud-based ammonium nitrate fuel oil explosive inert filler is mixed with ammonium nitrate to produce explosive, the white-mud-based ammonium nitrate fuel oil explosive inert filler can be mixed uniformly, and a uniform distribution state is maintained in a transportation or storage process; and the influence on the performance of the explosive due to aggregation of the inert filler in the storage or transportation process due to over-high or over-low density is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of ammonium oil-fuel oil explosives, and in particular to a white mud-based ammonium oil-fuel oil explosive inert filler and a preparation method thereof, an ammonium oil-fuel oil explosive composition and an ammonium oil-fuel oil explosive. Background Art

[0002] Open-pit coal mines are an important part of my country's coal industry. They have the advantages of high resource recovery rate, good safety conditions, high labor efficiency, and large production scale. Their role in stabilizing the domestic coal supply is becoming more and more obvious. As of 2021, there are 376 open-pit coal mines in my country with a production capacity of 950 million t / a, accounting for 17.8% of the country's total coal mine production capacity. At present, the crushing of rocks and coal in open-pit mines mainly relies on blasting, with an annual blasting volume of about 130 million cubic meters. At the same time, the extraction of alumina through the "one-step acid dissolution method" of fly ash has achieved the resource utilization of fly ash, while producing a large amount of waste slag, namely white mud. How to further utilize the white mud is of great significance to reducing environmental pressure.

[0003] The explosives used for pre-splitting blasting in open-pit mines are mainly low-detonation-velocity ammonium nitrate explosives. Low-detonation-velocity explosives usually contain inert fillers to control the explosion speed, delay the explosion reaction, and make the explosion more stable and controllable.

[0004] At present, the inert fillers used in low-explosion velocity ammonium oil oil explosives mainly include expanded perlite and polystyrene balls. For example, Chinese patent application with application number 202011044358.6 provides a low-explosion velocity ammonium oil oil explosive and a preparation method thereof, and discloses a low-explosion velocity ammonium oil oil explosive with expanded perlite as an inert filler; a patent application with publication number CN101844956B provides a low-explosion velocity ammonium oil oil explosive and a preparation method thereof, and discloses a low-explosion velocity ammonium oil oil explosive with polystyrene balls as an inert filler.

[0005] However, the bulk density of expanded perlite and polystyrene balls, two low-density inert fillers, is much lower than that of porous granular ammonium nitrate (usually 0.73-0.86 g / cm 3 ), so there is a problem of uneven mixing with porous granular ammonium nitrate in the process of preparing explosives. When the mixture of ammonium nitrate and perlite or polystyrene balls flows from the loading tower to the explosive vehicle, the perlite or polystyrene balls fall later than the ammonium nitrate due to air resistance, and during the transportation of the explosive vehicle, the porous granular ammonium nitrate with high density will settle, causing the perlite or polystyrene balls to float, further aggravating the unevenness of the mixture, resulting in the change of the density of the explosive from large to small during the discharge process of the blasthole. At the same time, the expanded perlite is fragile and dusty, and it is easy to block the hole and get stuck during use and transportation, and the equipment failure rate is high. Summary of the invention

[0006] The main purpose of the present invention is to provide a white mud-based ammonium nitrate-oil fuel oil inert filler and a preparation method thereof, an ammonium nitrate-oil fuel oil composition and an ammonium nitrate-oil fuel oil, so as to solve the problem of uneven mixing of the inert filler used for ammonium nitrate-oil fuel oil and porous granular ammonium nitrate in the prior art.

[0007] In order to achieve the above-mentioned object, according to one aspect of the present invention, a method for preparing a white mud-based ammonium nitrate-oil-fuel mixture inert filler is provided, and the preparation method comprises: step S1, granulating and screening white mud to obtain precursor particles, wherein the white mud is the waste residue remaining after alumina is extracted from fly ash by a hydrochloric acid leaching method; step S2, drying the precursor particles at 100° C. or below to obtain dry particles; step S3, roasting the dry particles to obtain the white mud-based ammonium nitrate-oil-fuel mixture inert filler.

[0008] Further, white mud is the waste residue remaining after extracting alumina from fly ash by hydrochloric acid leaching;

[0009] Preferably, the SiO in the white mud is calculated by weight percentage on a dry basis. 2 The content is 65% to 75%, Al 2 O 3 The content is 12% to 20%,

[0010] Preferably, the water content of the white mud is less than 30%.

[0011] Furthermore, in step S2, the drying is air-drying, or the drying is drying at 80°C to 100°C;

[0012] Preferably, the moisture content of the dried granules is 10% to 15%.

[0013] Furthermore, the particle size of the precursor particles is 0.5 to 2.5 mm.

[0014] Furthermore, the calcination temperature is 1050° C. to 1200° C., and the calcination time is 30 min to 120 min.

[0015] Further, the loose bulk density of the white mud-based ammonium nitrate-oil explosive inert filler is 0.73 to 0.86 g / cm 3 ,

[0016] The oil absorption rate of the white mud-based ammonium nitrate-oil explosive inert filler is less than 8%.

[0017] Furthermore, the particle size of the white mud-based ammonium nitrate-oil explosive inert filler is 0.5 to 2.5 mm.

[0018] In order to achieve the above object, according to one aspect of the present invention, a white mud-based ammonium amine oil fuel oil inert filler is provided, and the white mud-based ammonium amine oil fuel oil inert filler is prepared by any of the above-mentioned preparation methods of the white mud-based ammonium amine oil fuel oil inert filler.

[0019] According to another aspect of the present application, an ammonium nitrate-oil-fuel mixture is provided, which comprises, by weight percentage, 80% to 85% of porous granular ammonium nitrate, 10% to 15% of a white mud-based ammonium nitrate-oil-fuel mixture inert filler and 5% to 6% of light diesel oil, wherein the white mud-based ammonium nitrate-oil-fuel mixture inert filler is the above-mentioned white mud-based ammonium nitrate-oil-fuel mixture inert filler.

[0020] According to another aspect of the present application, an ammonium oil-fuel mixture is provided, which is prepared from the ammonium oil-fuel mixture composition.

[0021] Application of technical scheme of the present invention, the preparation method of above-mentioned white mud base ammonium oil-fuel oil explosive inert filler uses fly ash hydrochloric acid leaching method to extract the waste residue white mud produced by aluminum oxide as raw material, and after granulation, is dried and roasted under specific conditions to prepare white mud base ammonium oil-fuel oil explosive inert filler. The loose bulk density of the white mud base ammonium oil-fuel oil explosive inert filler prepared by this preparation method is the same as porous granular ammonium nitrate, when mixed with ammonium nitrate to produce explosive, it can be mixed more evenly, and maintain a uniformly distributed state during transportation or storage, to prevent the inert filler from gathering during storage or transportation due to excessive or too small density, and then affecting the performance of explosive. Further, above-mentioned preparation method not only provides a kind of excellent inert filler for the production of explosive, but also can consume the solid waste produced by fly ash resource utilization, and realizes comprehensive utilization of waste resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 A schematic diagram of a device for preparing an ammonium oil-fuel mixture according to an embodiment of the present invention is shown.

[0024] Among them, the above-mentioned drawings include the following figure marks: 01, first storage bin; 02, second storage bin; 03, fuel tank; 04, first inclined screw device; 05, second inclined screw device; 06, diesel pump; 07, first mixed inclined screw device; 08, second mixed inclined screw device. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] As analyzed by the background technology of the present application, there is the problem that the inert filler for ammonium nitrate oil-fuel mixture in the prior art is difficult to mix evenly with the porous granular ammonium nitrate in the ammonium nitrate oil-fuel mixture because the density differs greatly from that in the ammonium nitrate oil-fuel mixture. In order to solve this problem, the application provides a kind of white mud-based ammonium nitrate oil-fuel mixture inert filler and preparation method thereof, ammonium nitrate oil-fuel mixture composition and ammonium nitrate oil-fuel mixture.

[0027] According to a typical embodiment of the present application, a method for preparing a white mud-based ammonium nitrate-fuel oil explosive inert filler is provided, and the preparation method comprises: step S1, granulating and screening the white mud to obtain precursor particles; step S2, drying the precursor particles at 100° C. or below to obtain dry particles; step S3, roasting the dry particles to obtain the white mud-based ammonium nitrate-fuel oil explosive inert filler.

[0028] The preparation method of the above-mentioned white mud-based ammonium oil-fuel oil explosive inert filler uses the waste white mud produced by the fly ash hydrochloric acid leaching method to extract aluminum oxide as raw material, and after granulation, it is dried and roasted under specific conditions to prepare the white mud-based ammonium oil-fuel oil explosive inert filler. The loose bulk density of the white mud-based ammonium oil-fuel oil explosive inert filler prepared by the preparation method is the same as that of porous granular ammonium nitrate, and when mixed with ammonium nitrate to produce explosives, it can be mixed more evenly, and the state of uniform distribution is maintained during transportation or storage, so as to prevent the inert filler from being aggregated during storage or transportation due to excessive or too small density, and then the performance of the explosive is affected. Further, the above-mentioned preparation method not only provides a kind of excellent inert filler for the production of explosives, but also can consume the solid waste produced by fly ash resource utilization, and realizes the comprehensive utilization of waste resources.

[0029] The above-mentioned white mud can be selected from existing technologies, such as the solid waste residue produced by the "one-step acid dissolution method" of extracting alumina from fly ash in a circulating fluidized bed. In some embodiments of the present application, the SiO in the white mud is calculated by weight percentage on a dry basis, that is, the components other than water. 2 The content is 65% to 75%, Al 2 O 3 The content is 12% to 20%. The density and oil absorption value of the inert filler of white mud-based ammonium nitrate oil explosive prepared with the white mud of the composition can better match the porous ammonium nitrate, the main component of the explosive, and further improve the stability and explosive power of the explosive. Preferably, the water content of the white mud is less than 30%,

[0030] In some embodiments of the present application, before granulating the white mud, the white mud is first placed in a high-speed mixer for stirring and crushing, and then a certain amount of water is sprayed into the mixer for high-speed stirring and mixing, so as to produce precursor particles with more suitable particle size and morphology.

[0031] In some embodiments of the present application, in order to obtain a white mud-based ammonium nitrate oil explosive inert filler product with a more suitable particle size, the particle size of the precursor particles obtained after granulation and screening is 0.5 to 2.5 mm, and of course it can also be particles of other particle size ranges within this particle size range.

[0032] The granulation method can be selected from the existing technology, such as granulation in a high-speed granulator with adjustable particle size. Preferably, the granulation is carried out in a high-speed granulator with adjustable particle size of 0.3 mm to 3 mm.

[0033] In the preparation method of the present application, the precursor particles are dried at 100°C or below, and then roasted, so that the particles can be formed into particles with stable structure and suitable density without adding other auxiliary agents such as pore-forming agents, so that the prepared white mud-based ammonium nitrate oil explosive inert filler and porous ammonium nitrate can be mixed more evenly. In some embodiments of the present application, in step S2, drying is to dry naturally, or drying is to dry at 80°C to 100°C, drying at this temperature, with higher drying efficiency, and the stability of the particles will not be adversely affected, specifically, the drying temperature can be 80°C, 82°C, 85°C, 87°C, 90°C, 92°C, 95°C, 97°C, 99°C, etc., but is not limited thereto.

[0034] Preferably, the moisture content of the dried particles is 10% to 15%. The white mud-based ammonium nitrate-oil explosive inert filler obtained after roasting with the dried particles having this moisture content has a suitable loose bulk density, and has more significant effects in increasing the explosive power, controlling the explosion speed and improving the stability. Specifically, the moisture content of the dried particles can be 10%, 11%, 12%, 13%, 14%, 15%, etc., and certainly can be other values ​​within the above range.

[0035] In some embodiments of the present application, in step S3, the calcination temperature is 1050°C to 1200°C, specifically 1050°C, 1060°C, 1070°C, 1080°C, 1090°C, 1100°C, 1110°C, 1120°C, 1130°C, 1140°C, 1150°C, 1160°C, 1170°C, 1180°C, 1190°C, etc., and of course other values ​​within the above range. The calcination time is 30min to 120min, specifically 30min, 40min, 50min, 60min, 70min, 80min, 90min, 100min, 110min, 120min, etc., and of course other values ​​within the above range. Calcination within the above temperature range can be to form suitable internal pores in the dry particles so that they have a suitable loose bulk density.

[0036] In some typical embodiments of the present application, the bulk density of the prepared white mud-based ammonium nitrate oil explosive inert filler is 0.73-0.86 g / cm 3 , specifically 0.73 g / cm 3 , 0.75g / cm 3 , 0.77g / cm 3 , 0.79g / cm 3 , 0.8g / cm 3 , 0.82g / cm 3 , 0.84g / cm 3 , 0.85g / cm 3 Etc., but not limited thereto. The loose bulk density of the white mud-based ammonium nitrate oil-fuel explosive inert filler is within the above range, which can make it more evenly mixed with porous ammonium nitrate particles.

[0037] In some embodiments of the present application, the oil absorption rate of the white mud-based ammonium nitrate oil explosive inert filler is less than 8%, specifically 0.1%, 0.5%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, etc., and of course it can also be other values ​​within the above range.

[0038] In some embodiments of the present application, the particle size of the white mud-based ammonium nitrate oil fuel oil inert filler is 0.5 to 2.5 mm, preferably spherical, which can better match the porous ammonium nitrate particles and further improve the performance of the ammonium nitrate oil fuel oil.

[0039] According to another typical embodiment of the present application, a white mud-based ammonium nitrate oil fuel oil inert filler is provided, which is prepared by any of the above-mentioned methods for preparing the white mud-based ammonium nitrate oil fuel oil inert filler.

[0040] The loose bulk density of the inert filler of white mud-based ammonium oil-fuel explosive prepared by the above preparation method is almost the same as that of porous granular ammonium nitrate. When mixed with ammonium nitrate to produce explosives, it can be mixed more evenly and maintain a uniform distribution during transportation or storage, so as to prevent the inert filler from aggregating during storage or transportation due to excessive or low density, thereby affecting the performance of the explosive. Further, the above preparation method not only provides an excellent inert filler for the production of explosives, but also can absorb the solid waste generated by fly ash resource utilization, and realize the comprehensive resource utilization of waste.

[0041] According to another typical embodiment of the present application, an ammonium nitrate-oil-fuel mixture composition is provided, which comprises, by weight percentage, 80% to 85% of porous granular ammonium nitrate, 10% to 15% of a white mud-based ammonium nitrate-oil-fuel mixture inert filler and 5% to 6% of light diesel oil, wherein the white mud-based ammonium nitrate-oil-fuel mixture inert filler is the above-mentioned white mud-based ammonium nitrate-oil-fuel mixture inert filler.

[0042] The ammonium oil-fuel oil explosive composition of the present application comprises a combination of the above-mentioned white mud-based ammonium oil-fuel oil explosive inert filler with porous granular ammonium nitrate and diesel in a specific ratio. Since the above-mentioned white mud-based ammonium oil-fuel oil explosive inert filler and the porous granular ammonium nitrate have similar loose bulk densities, they can be uniformly mixed with the porous granular ammonium nitrate and light diesel, and a uniform mixing state can be maintained even during long-term storage or transportation. Not only does the performance of the explosive is excellent, but it is also beneficial to reduce the failure rate of the explosive device.

[0043] The porous granular ammonium nitrate and light diesel oil can be selected from the prior art. This application has no special requirements. As an example, the porous granular ammonium nitrate is the ammonium nitrate specified in the HG / T3250-2011 standard.

[0044] According to another typical embodiment of the application, a kind of ammonium oil-fuel mixture is provided, and this ammonium oil-fuel mixture is made of above-mentioned ammonium oil-fuel mixture composition. Because above-mentioned ammonium oil-fuel mixture composition comprises above-mentioned white mud base ammonium oil-fuel mixture inert filler with a specific ratio and a combination of porous granular ammonium nitrate and diesel oil, wherein white mud base ammonium oil-fuel mixture inert filler and porous granular ammonium nitrate have close loose packing density, can evenly mix with porous granular ammonium nitrate and light diesel oil, even in long-term storage or transportation process, also can keep uniform mixed state, not only the performance of explosive is good, and is conducive to reducing the failure rate of explosive device.

[0045] In some embodiments of the present application, the detonation velocity of the above-mentioned ammonium nitrate oil explosive is 1500-2500 m / s.

[0046] The above-mentioned ammonium nitrate oil-fuel mixture composition is mixed evenly to obtain the ammonium nitrate oil-fuel mixture of the present application, and specific technology or device can be selected in the prior art. In some embodiments of the present application, Figure 1 As shown, the preparation steps of ammonium oil-fuel mixture include: porous granular ammonium nitrate is loaded in a first storage bin 01, white mud-based ammonium oil-fuel mixture inert filler is loaded in a second storage bin 02, and light diesel oil is loaded in a fuel tank 03; porous granular ammonium nitrate and white mud-based ammonium oil-fuel mixture inert filler are respectively discharged through a first oblique screw device 04 and a second oblique screw device 05, and then fully mixed in a first mixing oblique screw device 07 to obtain a dry mixture; light diesel oil is discharged through a diesel pump 06, and mixed with the dry mixture in a second mixing oblique screw device 08 to obtain ammonium oil-fuel mixture.

[0047] The beneficial effects that can be achieved by the present application will be further illustrated below in combination with embodiments and comparative examples.

[0048] Example 1

[0049] Weigh a certain amount of white mud (based on white mud dry basis, SiO 2 The content is 65%, Al 2 O 3 The content of the raw material is 20%, and the moisture content of the white mud is 31%), which is placed in a high-speed granulator for granulation. After granulation, it is sieved to obtain particles of 0.5-2.5 mm. The sieved particles are dried at room temperature for 48 hours, and the moisture content after drying is 15%; then they are roasted at 1050°C for 120 minutes, and after natural cooling, a white mud-based inert filler is obtained, and its loose bulk density is 0.85g / cm 3 , the oil absorption rate is 3.67%.

[0050] Example 2

[0051] A certain amount of white mud (the same as in Example 1) was weighed and placed in a high-speed granulator for granulation. After granulation, the particles were sieved to obtain particles of 0.5-2.5 mm. The sieved particles were dried at 100° C. for 2 h, and the moisture content after drying was 12%. Then, the particles were calcined at 1120° C. for 120 min, and naturally cooled to obtain a white mud-based inert filler, whose loose bulk density was 0.76 g / cm 3 , the oil absorption rate is 2.87%.

[0052] Example 3

[0053] A certain amount of white mud (the same as in Example 1) was weighed and placed in a high-speed granulator for granulation. After granulation, the particles were sieved to obtain particles of 0.5-2.5 mm. The sieved particles were dried at 100° C. for 2 h, and the moisture content after drying was 12%. Then, the particles were calcined at 1150° C. for 90 min, and naturally cooled to obtain a white mud-based inert filler, whose loose bulk density was 0.73 g / cm 3, the oil absorption rate is 3.56%.

[0054] Example 4

[0055] A certain amount of white mud (the same as in Example 1) was weighed and placed in a high-speed granulator for granulation. After granulation, the particles were sieved to obtain particles of 0.5-2.5 mm. The sieved particles were dried at 80° C. for 6 h, and the moisture content after drying was 10%. Then, the particles were calcined at 1100° C. for 120 min, and naturally cooled to obtain a white mud-based inert filler, whose loose bulk density was 0.82 g / cm 3 , the oil absorption rate is 3.10%.

[0056] Example 5

[0057] A certain amount of white mud (the same as in Example 1) was weighed and placed in a high-speed granulator for granulation. After granulation, the particles were sieved to obtain particles of 0.5-2.5 mm. The sieved particles were dried at 80° C. for 6 h, and the moisture content after drying was 10%. Then, the particles were calcined at 1200° C. for 30 min, and naturally cooled to obtain a white mud-based inert filler, whose loose bulk density was 0.83 g / cm 3 , the oil absorption rate is 2.25%.

[0058] Example 6

[0059] A certain amount of white mud (the same as in Example 1) was weighed and placed in a high-speed granulator for granulation. After granulation, the particles were sieved to obtain particles of 0.5-2.5 mm. The sieved particles were dried at 80° C. for 6 h, and the moisture content after drying was 10%. Then, the particles were calcined at 1200° C. for 20 min, and naturally cooled to obtain a white mud-based inert filler, whose loose bulk density was 0.91 g / cm 3 , the oil absorption rate is 2.50%.

[0060] Example 7

[0061] A certain amount of white mud (the same as in Example 1) was weighed and placed in a high-speed granulator for granulation. After granulation, the particles were sieved to obtain particles of 0.5-2.5 mm. The sieved particles were dried at 80° C. for 6 h, and the moisture content after drying was 10%. Then, the particles were calcined at 1200° C. for 150 min, and naturally cooled to obtain a white mud-based inert filler, whose loose bulk density was 0.65 g / cm 3 , the oil absorption rate is 7.9%.

[0062] Comparative Example 1

[0063] A certain amount of white mud (the same as in Example 1) was weighed and placed in a high-speed granulator for granulation. After granulation, the particles were sieved to obtain particles of 0.5-2.5 mm. The sieved particles were calcined at 1050°C for 120 min and naturally cooled to obtain a white mud-based inert filler with a loose bulk density of 0.92 g / cm 3 The oil absorption rate is 15.2%, the filler is severely cracked, and the particle size is no longer within the range of 0.5-2.5mm.

[0064] Comparative Example 2

[0065] A certain amount of white mud (the same as in Example 1) was weighed and placed in a high-speed granulator for granulation. After granulation, the particles were sieved to obtain particles of 0.5-2.5 mm. The sieved particles were dried at 120 degrees Celsius for 2 hours, and the moisture content after drying was 5%; then, the particles were calcined at 1050 degrees Celsius for 120 minutes, and naturally cooled to obtain a white mud-based inert filler, whose loose bulk density was 0.88 g / cm 3 , the oil absorption rate is 2.35%.

[0066] Application Example 1

[0067] The white mud-based inert fillers prepared in the above preparation examples and comparative examples were mixed with 85% of porous granular ammonium nitrate at a ratio of 10%, and then mixed with 5% of diesel. Part of the prepared ammonium nitrate oil explosives were charged with 110 PVC pipes to test the detonation velocity.

[0068] The white mud-based inert fillers prepared in the above-mentioned preparation examples and comparative examples were mixed with porous ammonium nitrate and diesel in the above-mentioned proportions and tested according to the following method.

[0069] Test method for the proportion of inert fillers at different positions: Load the prepared explosives into a vertical tubular container at a height of 30 meters, take the top as the reference, and take materials at a depth of 5 meters, 10 meters, and 15 meters to test the proportion of inert fillers at different positions.

[0070] Method for testing the detonation velocity of explosives with different storage times: The prepared explosives are stored statically under the same conditions, and the detonation velocity is tested 7 days, 15 days, and 30 days after storage.

[0071] To simulate the blasting of explosives after transportation, the prepared explosives were loaded into a 110 PVC pipe and placed on an oscillator. The pipe was shaken for 30 min and then subjected to blasting tests. Each type of explosive was tested three times.

[0072] Calculation of explosion velocity extreme value: R D =D max -D min， In the formula, R D ——the value of the extreme difference of detonation velocity (accurate to integer), m / s; Dmax ——The maximum value among the three detonation velocities, m / s; D min ——The minimum value among the three detonation velocity values, m / s. The detonation velocity range R D It should not be greater than 300m / s. If it is greater than 300m / s, it means that the explosive is unstable and not suitable for practical application. If it is less than 300m / s, it means that the explosive has stable explosion performance and is suitable for application.

[0073] Table 1

[0074]

[0075]

[0076] Application Comparative Example 1

[0077] 1.5% of expanded perlite was mixed with 93.5% of porous granular ammonium nitrate, and then mixed with 5% of diesel to prepare ammonium oil-fuel explosive, and the detonation velocity was tested. The detonation velocity of the explosive at different positions and the detonation velocity of the explosive at different storage times were tested according to the same test method as in Application Example 1. The test results are shown in Table 2 below.

[0078] Table 2

[0079]

[0080] Application Example 2

[0081] 15% of the white mud-based inert filler prepared in Example 1 was mixed with 80% of porous granular ammonium nitrate, and then mixed with 5% of diesel. The prepared ammonium oil-fuel explosive was charged using a 110 PVC pipe, and its average detonation velocity was measured to be 1682 m / s.

[0082] Application Example 3

[0083] 12% of the white mud-based inert filler prepared in Example 1 was mixed with 82% of porous granular ammonium nitrate, and then mixed with 6% of diesel. The prepared ammonium oil-fuel explosive was charged using a 110 PVC pipe, and its average detonation velocity was 2048 m / s.

[0084] Application Example 4

[0085] 10% of the white mud-based inert filler prepared in Example 1 was mixed with 84.5% of porous granular ammonium nitrate, and then mixed with 5.5% of diesel. The prepared ammonium oil-fuel explosive was charged using a 110 PVC pipe, and its detonation velocity was measured to be an average of 2176 m / s.

[0086] Application Comparative Example 2

[0087] 5% of the white mud-based inert filler prepared in Example 1 was mixed with 89% of porous granular ammonium nitrate, and then mixed with 6% of diesel. The prepared ammonium oil-fuel explosive was charged using a 110 PVC pipe, and its detonation velocity was measured to be 2731 m / s.

[0088] Application Comparative Example 3

[0089] 20% of the white mud-based inert filler prepared in Example 1 was mixed with 75% of porous granular ammonium nitrate, and then mixed with 5% of diesel. The prepared ammonium oil-fuel explosive was charged using a 110 PVC pipe, and its detonation velocity was measured to be 1245 m / s.

[0090] From the above description, it can be seen that the above-mentioned embodiment of the present invention has achieved the following technical effect: the preparation method of the above-mentioned white mud-based ammonium oil-fuel oil explosive inert filler uses the waste slag white mud produced by the fly ash hydrochloric acid leaching method to extract aluminum oxide as raw material, and after granulation, it is dried and roasted under specific conditions to prepare the white mud-based ammonium oil-fuel oil explosive inert filler. The loose bulk density of the white mud-based ammonium oil-fuel oil explosive inert filler prepared by this preparation method is the same as that of porous granular ammonium nitrate, and when mixed with ammonium nitrate to produce explosives, it can be mixed more evenly, and the state of uniform distribution is maintained during transportation or storage, so as to prevent the inert filler from being aggregated during storage or transportation due to excessive or too small density, and then affecting the performance of explosives. Further, the above-mentioned preparation method not only provides a kind of excellent inert filler for the production of explosives, but also can consume the solid waste produced by fly ash resource utilization, and realizes the comprehensive utilization of waste resources.

[0091] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for preparing a white mud-based ammonium nitrate-oil explosive inert filler, characterized in that, include: Step S1, granulating and screening white mud to obtain precursor particles, wherein the white mud is the waste residue remaining after alumina is extracted from fly ash by hydrochloric acid leaching; Step S2, drying the precursor particles at 100° C. or below to obtain dried particles; Step S3, roasting the dried particles to obtain white mud-based ammonium nitrate-oil explosive inert filler.

2. the preparation method of white mud base ammonium nitrate-fuel oil explosive inert filler according to claim 1, is characterized in that, The white mud is the waste residue remaining after extracting alumina from fly ash by hydrochloric acid leaching; Preferably, the SiO2 content in the white mud is 65% to 75%, and the Al2O3 content is 12% to 20% in terms of dry mass percentage; Preferably, the water content of the white mud is less than 30%.

3. the preparation method of white mud base ammonium nitrate oil-fuel mixture inert filler according to claim 1, is characterized in that, In step S2, the drying is air-drying, or the drying is drying at 80°C to 100°C; Preferably, the moisture content of the dry particles is 10% to 15%.

4. the preparation method of white mud base ammonium nitrate oil-fuel mixture inert filler according to claim 1, is characterized in that, The particle size of the precursor particles is 0.5 to 2.5 mm.

5. the preparation method of white mud base ammonium nitrate oil-fuel mixture inert filler according to claim 1 is characterized in that, The calcination temperature is 1050° C. to 1200° C., and the calcination time is 30 min to 120 min.

6. the preparation method of white mud base ammonium nitrate-fuel oil inert filler according to claim 1 is characterized in that, The loose bulk density of the white mud-based ammonium oil-fired explosive inert filler is 0.73-0.86 g / cm 3 , The oil absorption rate of the white mud-based ammonium nitrate-oil fuel oil inert filler is less than 8%.

7. the preparation method of white mud base ammonium nitrate-oil fuel oil inert filler according to claim 1 is characterized in that, The particle size of the white mud-based ammonium nitrate oil explosive inert filler is 0.5-2.5 mm.

8. A white mud-based ammonium nitrate-oil explosive inert filler, characterized in that, The invention is prepared by the method for preparing the white mud-based ammonium nitrate-oil fuel oil inert filler according to any one of claims 1 to 7.

9. an ammonium oil-fuel explosive composition, characterized in that, Calculated by weight percentage, it comprises 80% to 85% of porous granular ammonium nitrate, 10% to 15% of white mud-based ammonium oil-fuel mixture inert filler and 5% to 6% of light diesel oil, wherein the white mud-based ammonium oil-fuel mixture inert filler is the white mud-based ammonium oil-fuel mixture inert filler as claimed in claim 8.

10. An ammonium oil-fuel mixture, characterized in that: Made from the ammonium oil-fuel explosive composition of claim 8.

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