Method for reducing granularity of muck pile through fine blasting

Abstract

The invention relates to the field of mining blasting, and discloses a method for reducing muck pile granularity through fine blasting, which comprises the following steps of: 1, increasing explosive unit consumption and adopting continuous charging to adapt to the rock hardness characteristic of a difficult-to-explode area; 2, adjusting the hole pitch and the density coefficient by adopting an equilateral triangle hole distribution mode; 3, setting inter-hole time delay and inter-row time delay to control the propagation path of blasting waves; fourthly, the position of the initiating explosive package is adjusted, double-layer detonation is achieved, and detonation energy is evenly distributed in the hole depth direction; and 5, after rectification in the step 1 to the step 4 is completed, detonating is started. According to the method, uniform distribution and effective control of blasting energy in the ore body are realized by finely controlling unit consumption of explosives, a hole distribution mode, delay parameters and cartridge bag position setting, generation of large rocks is remarkably reduced, and the mining efficiency and the resource utilization rate of a mine are improved.

Description

Technical Field

[0001] The invention relates to the technical field of mining blasting, in particular to a method for reducing the particle size of blast piles through fine blasting. Background Art

[0002] In mining operations, blast pile particle size refers to the particle size distribution of ore or rock after blasting. The control of blast pile particle size is of great significance in mining engineering, which directly affects the efficiency and cost of subsequent processing links such as ore loading, transportation, crushing and screening. Reasonable control of blast pile particle size can not only improve the utilization efficiency of mineral resources and reduce resource waste, but also reduce energy consumption and operating costs in subsequent processing links, thereby realizing efficient and economic development of mining operations. However, there are many difficulties in controlling blast pile particle size in practice, which is one of the key technical challenges in mining engineering.

[0003] Impact of large rock generation on subsequent processing:

[0004] During blasting operations, if the blast pile particle size is not properly controlled, a large number of large rocks will often be generated. These large rocks are difficult to directly enter the subsequent crushing and screening system, and need to be crushed twice or even multiple times, which not only increases mechanical wear and energy consumption, but also significantly reduces the overall production efficiency of the mine. In addition, large rocks will also reduce equipment efficiency during loading and transportation, increasing transportation costs. Therefore, it is an urgent problem to reasonably control the blast pile particle size and reduce the generation of large rocks in mining.

[0005] Uneven energy distribution leads to unsatisfactory crushing effect:

[0006] In traditional blasting methods, deficiencies in charging methods and hole layout design lead to uneven distribution of explosive energy in the rock mass, and the propagation path of the blasting wave in the rock mass is difficult to effectively control. This uneven energy distribution often leads to excessive or insufficient crushing of local rocks. Especially in hard and difficult-to-explode ore bodies, uneven energy distribution affects the crushing quality and produces a large number of rocks that do not meet the requirements. The lack of precise control of energy directly leads to unsatisfactory blasting results, which not only affects the efficiency of resource utilization, but also causes waste of explosives and energy.

[0007] Insufficient delay control and blast wave interference issues:

[0008] In blasting operations, delay control is an important factor affecting the propagation path of the blasting wave and the energy superposition effect. In traditional methods, delay control often fails to meet the crushing requirements of complex ore bodies, resulting in interference between blasting waves between holes and rows, weakening the effect of energy and causing uneven crushing. At the same time, due to insufficient delay control, the propagation of blasting waves in the ore body is prone to premature attenuation or excessive concentration, affecting the reasonable distribution of energy. The lack of precise delay control under complex rock conditions makes the blasting effect unstable and difficult to meet the ideal particle size distribution requirements for ore crushing.

[0009] Safety and environmental protection requirements for blasting operations:

[0010] With the development of modern mining technology, higher requirements are placed on the safety and environmental protection of blasting operations. Traditional manual detonation operations have high safety risks, and operators need to work in high-risk areas, which poses hidden dangers. At the same time, the traditional blasting method that lacks precise energy control is prone to cause vibration shock, dust diffusion and other effects on the surrounding environment, increasing the adverse impact on the environment. The current mining field urgently needs a refined blasting solution that can take into account blasting effects, safety and environmental protection.

[0011] Therefore, the present invention proposes a method for reducing the particle size of the blast pile by fine blasting to solve the shortcomings of the prior art. Summary of the invention

[0012] In view of the shortcomings of the prior art, the present invention provides a method for reducing the blast pile particle size through fine blasting. The method achieves uniform distribution and effective control of blasting energy in the ore body by finely controlling the unit consumption of explosives, hole layout, delay parameters and charge position setting, significantly reduces the generation of large rocks, and improves the mining efficiency and resource utilization of the mine. While ensuring efficient crushing, the present invention enhances the safety and environmental protection of blasting operations, meeting the requirements of sustainable development of modern mining.

[0013] To achieve the above objectives, the present invention is implemented through the following technical solutions: A method for reducing the particle size of blast piles by fine blasting, comprising the following steps:

[0014] Step 1: Increase the unit consumption of explosives and adopt continuous charging to adapt to the hardness characteristics of rocks in difficult-to-explode areas;

[0015] Step 2: Use an equilateral triangle hole arrangement method to adjust the hole spacing and density coefficient;

[0016] Step 3: Set the delay between holes and between rows to control the propagation path of the blast wave;

[0017] Step 4: Adjust the position of the explosive charge to achieve double-layer detonation so that the blasting energy is evenly distributed along the hole depth direction;

[0018] Step 5. Start detonation after rectification of steps 1 to 4 is completed.

[0019] Preferably, the increase in explosive unit consumption includes controlling the explosive unit consumption Q in the explosion-resistant area to 0.3-0.5 kg / m 3 , the calculation formula of the explosive unit consumption Q is:

[0020]

[0021] Where W is the total amount of explosives used, in kg; V is the volume of rock, in m 3 .

[0022] Preferably, the continuous charging includes uniformly filling the blast hole with explosives, and using a sealed charging tube to control the charge density to 850-900 kg / m 3 , and a gap area is reserved at the bottom of the hole, the height of the gap area is 1.5 times the hole diameter, so as to reduce the impact of explosive recoil on the bottom of the hole.

[0023] Preferably, the hole arrangement adopts an equilateral triangle hole arrangement, and the hole spacing L is calculated by the following formula:

[0024]

[0025] Among them, S represents the reference spacing of hole layout, and its value range is 1-2 meters.

[0026] Preferably, the calculation formula of the density coefficient η of the hole arrangement method is:

[0027]

[0028] Wherein, D represents the row spacing, and the row spacing range is 0.8-1.5 meters; the density coefficient η is set to 1.15.

[0029] Preferably, the setting of the delay between holes and between rows includes the following steps:

[0030] The delay between holes is set to 15 milliseconds, and the delay between rows is set to 40 milliseconds;

[0031] The delay time Δt is calculated by the following formula:

[0032]

[0033] Wherein, w represents the charge amount of explosive per hole; V p represents the blast wave velocity; K1 is the empirical correction coefficient, ranging from 1.0 to 1.5; W represents the energy required for blasting; C p represents the specific heat capacity of rock; S represents the hole spacing; V represents the volume of the blasting area.

[0034] Preferably, the setting of the inter-hole and inter-row delays includes a zoned delay design, which divides the blasting area into several blocks, with the delay of each block set to 15 milliseconds and the delay between adjacent blocks set to 50 milliseconds, so as to achieve uniform energy propagation in different blocks.

[0035] Preferably, the position of the detonating charge includes:

[0036] The first charge is placed at the bottom of the hole, at a distance of 1.5 times the hole diameter, to preferentially crush the bottom rock;

[0037] The second charge is placed at 1 / 3 of the hole depth to release blasting energy in layers at different depths.

[0038] Preferably, the detonation time of the first explosive package is t0, and the detonation time of the second explosive package is calculated by the following formula:

[0039] t top =t0+Δt top

[0040] Among them, Δt top is the delay time, and the delay range is set to 10-20 milliseconds, so that the blasting energy is evenly distributed along the hole depth direction during the double-layer detonation process; t0 is the detonation time of the bottom charge.

[0041] Preferably, after the blasting operation is completed, the blast pile is subjected to a particle size test, wherein the particle size test uses a screening method to calculate the average particle size d of the blast pile. avg , and its calculation formula is as follows:

[0042]

[0043] Among them, d i Indicates the particle size at each level; n i represents the number of samples with the corresponding particle size; N represents the total number of samples; the average particle size d avg Control within 165 mm.

[0044] The present invention provides a method for reducing the particle size of blast piles by fine blasting. It has the following beneficial effects:

[0045] 1. The present invention increases the unit consumption of explosives accurately, adopts continuous charging and optimized hole arrangement, so that the energy of explosives can act more evenly inside the rock mass. The equilateral triangle hole arrangement and reasonable density coefficient ensure the uniform propagation of the blasting wave in the rock mass, effectively avoiding the generation of large rocks in traditional blasting. This uniform crushing effect not only reduces the subsequent secondary crushing requirements, simplifies the loading and transportation links, but also further improves the overall efficiency of blasting, reduces the waste of resources in the blasting process, and brings significant optimization to the mining production process.

[0046] 2. The present invention greatly improves the utilization efficiency of explosive energy by setting the delay between holes and the delay between rows, and configuring the detonation position and sequence of the double-layer charge. The double-layer charge detonation design at the bottom and the middle and upper parts allows the energy to be released layer by layer from bottom to top, achieving effective crushing of the full hole depth. Refined delay control avoids excessive concentration or interference of the blasting wave, allowing the blasting wave to propagate stably in the ore body. This optimized blasting design not only meets the crushing requirements of ore bodies of different depths and hardnesses, but also further enhances the precise control of energy. It is particularly suitable for the uniform crushing of hard or complex rock formations, enhancing the overall effect of mining.

[0047] 3. The present invention significantly reduces the blast pile particle size, making the rock crushing more uniform, and providing convenience for subsequent ore processing, screening, loading and transportation. Smaller rock particles greatly reduce the load of subsequent crushing equipment, not only reducing mechanical wear, but also shortening processing time, thereby significantly reducing costs. By finely controlling the unit consumption of explosives, hole density and charge delay, the present invention reduces the ineffective consumption of explosives, saves resources, optimizes the economy and production efficiency of the overall operation of the mine, and directly improves the economic benefits of the enterprise.

[0048] 4. The present invention ensures accurate execution of blasting operations through a remote detonation control system, avoids direct involvement of operators in high-risk areas, and greatly improves safety. At the same time, through precise control of explosive consumption and improvement of energy utilization, vibration and impact on the surrounding environment are reduced, energy consumption and environmental pollution are reduced. This technology not only meets the environmental protection requirements of green mines, but also promotes the sustainable development of the mining industry, brings positive impacts to society and the environment, and is an innovative blasting solution with safety, economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 The present invention is a flow chart of a method for reducing the particle size of explosive pile by fine blasting. DETAILED DESCRIPTION

[0050] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings 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.

[0051] Example:

[0052] Please refer to the attached Figure 1 The embodiment of the present invention provides a method for reducing the particle size of blast pile by fine blasting, comprising the following steps:

[0053] Step 1: Increase the explosive consumption and use continuous charging to adapt to the rock hardness characteristics of the difficult-to-explode area

[0054] In this embodiment, in order to adapt to the high hardness characteristics of the rock in the difficult-to-explode area, the unit consumption of explosives is first adjusted. The increase in unit consumption of explosives can make the energy effect of explosives in the rock more intense, thereby improving the rock crushing effect. In the present invention, the unit consumption of explosives Q refers to the amount of explosives required per unit volume of rock, and the unit is kg / m 3 , and its calculation formula is:

[0055]

[0056] in:

[0057] W is the total amount of explosive used, in kg;

[0058] V is the rock volume, in m 3 ;

[0059] Q is the volume of rock in the blasting area, in m 3 .

[0060] In this example, 0.3 kg / m 3 As the starting value of explosive consumption, to ensure the basic crushing effect at the beginning of blasting. Then gradually increase the explosive consumption in the test, each time increasing by 0.1kg / m 3 , and observe the crushing effect under different unit consumption. The experiment shows that when the unit consumption of explosives is 0.3-0.5kg / m 3 When the crushing speed is between 0.1 and 0.2mm, a more ideal crushing effect can be achieved, thus adapting to the regional characteristics of higher rock hardness.

[0061] After determining the unit consumption of explosives, the present invention further adopts a continuous charging method to fill the explosives. In this embodiment, continuous charging means uniformly filling the explosives in the blast hole to avoid local excessive or insufficient crushing that may be caused by traditional interval charging. The specific implementation method of continuous charging is as follows:

[0062] Charge density control: To ensure the uniformity of explosive density in the blast hole, a waterproof and shockproof sealed charge tube is used in this embodiment to control the charge density at 850-900kg / m 3 This sealed charging method can ensure that the explosives are evenly distributed in the hole and improve the stability of blasting.

[0063] Bottom hole buffer setting: a certain gap area is reserved at the bottom of the blast hole, and the height of the gap area is 1.5 times the hole diameter. The purpose of setting the bottom hole buffer is to reduce the impact of explosive recoil on the bottom of the hole, so as to avoid excessive crushing or energy waste at the bottom of the hole, so as to concentrate the energy more on the rock that needs to be crushed and increase the controllability of the blasting effect.

[0064] Segmented charging design: In this embodiment, segmented charging is also performed on the deep hole according to the hole depth and rock hardness characteristics. The segmented charging design can optimize the distribution of each section of charging according to the structural characteristics of the rock, so that the explosive energy can be evenly released along the hole depth direction, which helps to prevent the generation of large rock chunks.

[0065] Through such continuous charging and segmented design, this embodiment can effectively increase the utilization rate of explosives and improve the uniformity of blasting energy in the entire blasting hole.

[0066] Step 2: Use equilateral triangle hole layout to adjust hole spacing and density coefficient

[0067] In this embodiment, in order to achieve uniform propagation of the blast wave, an equilateral triangle hole arrangement is adopted. The equilateral triangle hole arrangement is a hole arrangement method that ensures that the distance between each hole is equal, so that the blast waves of adjacent holes interact with each other to form a uniform crushing effect. Specifically, the calculation formula of the hole spacing L is as follows:

[0068]

[0069] in:

[0070] L is the hole spacing, which indicates the distance between adjacent blasting holes;

[0071] S is the reference spacing for hole arrangement, which is usually set at 1-2 meters according to the hardness and structure of the rock in the mining area.

[0072] After determining the hole arrangement, this embodiment also optimizes the density coefficient to further adjust the ratio of hole spacing to row spacing, so that the blast wave propagates more stably in the longitudinal and lateral directions. The calculation formula of the density coefficient η is:

[0073]

[0074] in:

[0075] D is the row spacing, that is, the distance between adjacent rows, which is usually set between 0.8-1.5 meters according to the rock hardness of the blasting area and design requirements.

[0076] In this embodiment, the density coefficient is set to 1.15. This value is obtained through multiple experiments and can effectively optimize the blasting effect. The purpose of setting the density coefficient is to ensure that the spacing and row spacing between blasting holes reach a reasonable ratio, so as to form a uniform pressure field during blasting and make the distribution of explosive energy more uniform.

[0077] By arranging holes in an equilateral triangle and setting a proper density coefficient, this embodiment can effectively improve the propagation uniformity of the blast wave and provide a stable energy distribution basis for the subsequent delay settings between holes and between rows.

[0078] Step 3: Set the delay between holes and between rows to control the propagation path of the blast wave

[0079] In this embodiment, the settings of the inter-hole delay and inter-row delay are finely adjusted according to the rock characteristics and hole layout of the mining area. The reasonable design of the inter-hole delay and inter-row delay can effectively control the propagation path of the blasting wave in the ore body, prevent interference between waves, and achieve a uniform crushing effect. Specifically, in this embodiment, the inter-hole delay and inter-row delay are set as follows:

[0080] Inter-hole delay setting: Inter-hole delay refers to the delay time between adjacent blasting holes, which is used to control the propagation of blasting waves between holes. Set the inter-hole delay to 15 milliseconds to allow the blasting waves of adjacent holes to be appropriately superimposed during the propagation process, thereby increasing the utilization rate of blasting energy.

[0081] Inter-row delay setting: Inter-row delay refers to the delay time between adjacent rows, and the inter-row delay is set to 40 milliseconds. A longer inter-row delay can reduce the interference of inter-row blasting waves, ensure the gradual propagation of waves, and prevent local pressure concentration caused by excessive superposition of waves.

[0082] Delay time calculation: In order to achieve accurate delay control, the delay time between holes and rows is calculated based on the following formula:

[0083]

[0084] in:

[0085] Δt is the delay time in milliseconds;

[0086] w is the charge of explosive per hole, in kg;

[0087] V p The blast wave velocity is usually 3000-5000m / s, which is set according to the characteristics of the ore;

[0088] K1 is an empirical correction factor with a value range of 1.0-1.5, which is used to adapt to different rock hardness;

[0089] W is the required blasting energy, in J;

[0090] C p is the specific heat capacity of rock, in J / kg·K;

[0091] S is the hole spacing, in meters;

[0092] V is the volume of the blasting area, in m 3 .

[0093] The delay time determined by the above formula can be gradually adjusted in the field test until the ideal blast wave propagation effect is achieved. The setting of the delay parameters is based on the specific characteristics of the rock mass in the mining area. By adjusting the delay between holes and rows, it is ensured that the blast wave will not be over-superimposed during the propagation process, nor will it reduce the crushing effect due to premature attenuation.

[0094] The delay control strategy of this embodiment effectively ensures that energy is stably transferred along a predetermined path during the blasting process, making the blasting wave propagation more uniform, thus laying a foundation for subsequent configuration of the detonating charge and uniform distribution of the blasting energy.

[0095] Step 4: Adjust the position of the explosive package to achieve double-layer detonation so that the blasting energy is evenly distributed along the hole depth direction.

[0096] In this embodiment, in order to more effectively utilize the blasting energy and achieve uniform crushing of the ore body, a double-layer detonating charge configuration is adopted, as follows:

[0097] Arrangement of explosive charge:

[0098] First charge: In this embodiment, the first charge is set at the bottom of the blast hole. The specific position is set to a position about 1.5 times the hole diameter from the bottom of the hole. The main function of the bottom charge is to first break the harder rock near the bottom of the hole, ensuring smoother transmission of blasting energy from the bottom to the top.

[0099] Second charge: The second charge is placed at 1 / 3 of the hole depth, in the middle and upper part of the hole. The second charge is used to provide additional energy to ensure the crushing of the middle and upper area and avoid uneven crushing caused by a single charge.

[0100] Double-layer detonation sequence and delay control:

[0101] Detonation time setting: In this embodiment, the bottom charge is first detonated, and the detonation time is set to t0. The detonation of the middle and upper charge is delayed for a certain time, and the delay time ranges from 10 to 20 milliseconds to ensure that the energy is transferred from bottom to top and released layer by layer.

[0102] Delay time calculation: The calculation formula for the delay detonation time is as follows:

[0103] t top =t0+Δt top

[0104] in:

[0105] t0 is the detonation time of the bottom charge;

[0106] Δt top It is the delay time, and the setting range is 10-20 milliseconds. The specific value is determined according to the hardness and structure of the rock.

[0107] Energy distribution of double-layer detonation:

[0108] By distributing explosive packs at the bottom and middle and upper areas of the hole, the distribution of blasting energy can be effectively controlled so that the energy can gradually act on rocks at different depths. The explosive packs at the bottom of the hole are mainly responsible for breaking the hard root rock mass, while the explosive packs in the middle and upper areas are responsible for supplementing the breaking energy so that the rock mass in the middle and upper layers can also be fully broken.

[0109] This double-layer configuration of detonation can avoid the energy concentration problem that may be caused by single-layer detonation, ensure that the energy is evenly diffused upward, and effectively reduce the generation of unbroken areas and large pieces.

[0110] The working principle of double-layer detonation:

[0111] In this embodiment, the purpose of double-layer charge detonation is to make the propagation of blast wave cover the whole hole depth range and maximize the use of explosive energy. The bottom charge is detonated first to produce a blast wave that spreads upward, while the middle and upper charge is detonated with a delay, so that the two blast waves are superimposed in the hole to form a more uniform crushing effect, which is particularly suitable for areas with large hole depth and hard rock.

[0112] The double-layer detonation delay setting allows the blasting energy to be released gradually from bottom to top, reducing the residue at the bottom of the hole and ensuring more uniform rock crushing throughout the entire hole depth.

[0113] This embodiment successfully achieves effective distribution of blasting energy in the hole depth direction by optimizing the arrangement of explosive packs and the double-layer detonation method, ensuring uniform crushing of rock masses at different depths. At the same time, reasonable delay control ensures the synchronization and stability of the double-layer explosive pack detonation, providing reliable guarantee for the final crushing effect.

[0114] Step 5. Start detonation after rectification of steps 1 to 4 is completed.

[0115] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for reducing the particle size of blast pile by fine blasting, characterized in that: The following steps are involved: Step 1: Increase the unit consumption of explosives and adopt continuous charging to adapt to the hardness characteristics of rocks in difficult-to-explode areas; Step 2: Use an equilateral triangle hole arrangement method to adjust the hole spacing and density coefficient; Step 3: Set the delay between holes and between rows to control the propagation path of the blast wave; Step 4: Adjust the position of the explosive charge to achieve double-layer detonation so that the blasting energy is evenly distributed along the hole depth direction; Step 5. Start detonation after rectification of steps 1 to 4 is completed.

2. A method for reducing the particle size of explosive piles by fine blasting according to claim 1, characterized in that: The increase in explosive unit consumption includes controlling the explosive unit consumption Q to 0.3-0.5 kg / m in the explosion-resistant area. 3 , the calculation formula of the explosive unit consumption Q is: Where W is the total amount of explosives used, in kg; V is the volume of rock, in m 3 .

3. The method for reducing the particle size of explosive pile by fine blasting according to claim 1, characterized in that: The continuous charging includes uniformly filling the blast hole with explosives and controlling the charge density to 850-900 kg / m 3 , and a gap area is reserved at the bottom of the hole, the height of the gap area is 1.5 times the hole diameter, so as to reduce the impact of explosive recoil on the bottom of the hole.

4. The method for reducing the particle size of explosive pile by fine blasting according to claim 1, characterized in that: The hole arrangement method adopts an equilateral triangle hole arrangement, and the hole spacing L is calculated by the following formula: Among them, S represents the reference spacing of hole layout, and its value range is 1-2 meters.

5. The method for reducing the particle size of explosive pile by fine blasting according to claim 1, characterized in that: The calculation formula of the density coefficient η of the hole arrangement method is: Wherein, D represents the row spacing, and the row spacing range is 0.8-1.5 meters; the density coefficient η is set to 1.

15.

6. The method for reducing the particle size of explosive pile by fine blasting according to claim 1, characterized in that: The setting of the delay between holes and between rows includes the following steps: The delay between holes is set to 15 milliseconds, and the delay between rows is set to 40 milliseconds; The delay time Δt is calculated by the following formula: Wherein, w represents the charge amount of explosive per hole; V p represents the blast wave velocity; K1 is the empirical correction coefficient, ranging from 1.0 to 1.5; W represents the energy required for blasting; C p represents the specific heat capacity of rock; S represents the hole spacing; V represents the volume of the blasting area.

7. The method for reducing the particle size of explosive pile by fine blasting according to claim 1, characterized in that: The setting of the inter-hole and inter-row delays includes a zoned delay design, which divides the blasting area into several blocks, with the delay of each block set to 15 milliseconds and the delay between adjacent blocks set to 50 milliseconds, so as to achieve uniform energy propagation in different blocks.

8. The method for reducing the particle size of explosive pile by fine blasting according to claim 1, characterized in that: The positions of the detonating charges include: The first charge is placed at the bottom of the hole, at a distance of 1.5 times the hole diameter, to preferentially crush the bottom rock; The second charge is placed at 1 / 3 of the hole depth to release blasting energy in layers at different depths.

9. The method for reducing the particle size of explosive pile by fine blasting according to claim 1, characterized in that: The detonation time of the first explosive package is t0, and the detonation time of the second explosive package is calculated by the following formula: t top =t0+Δt top Among them, Δt top is the delay time, and the delay range is set to 10-20 milliseconds, so that the blasting energy is evenly distributed along the hole depth direction during the double-layer detonation process; t0 is the detonation time of the bottom charge.

10. The method for reducing the particle size of explosive pile by fine blasting according to claim 1, characterized in that: After the blasting operation is completed, the blast pile is subjected to a particle size test. The particle size test uses a screening method to calculate the average particle size d of the blast pile. avg , and its calculation formula is as follows: Among them, d i Indicates the particle size at each level; n i represents the number of samples with the corresponding particle size; N represents the total number of samples; the average particle size d avg Control within 165 mm.

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