Stemming material for blasting and manufacturing method thereof

Abstract

The present invention relates to a stemming material for blasting and a manufacturing method thereof. The stemming material is a mixture of crushed shell particles and an aqueous glycerin solution, has excellent sealing properties with respect to blasting explosion pressure, minimizes blasting vibration and noise because oyster shells increase friction with a blasting hollow wall and thereby improve the stemming effect, shortens the duration of blasting work by improving blasting efficiency, greatly reduces the cost of blasting work, improves the safety of blasting work, can secure economic feasibility by effectively utilizing shell waste that is generated in large quantities, and can solve environmental problems caused by the shell waste.

Description

Blasting agent and its manufacturing method

[0001] The present invention relates to a blasting pre-curing agent and a method for manufacturing the same, and more specifically, to a blasting pre-curing agent and a method for manufacturing the same, which greatly improves blasting efficiency by mixing shells and a glycerin aqueous solution.

[0002] Generally, in construction fields such as rock blasting, abandoned building blasting, and open-air blasting, blasting systems that use explosives to cause explosion and collapse are used.

[0003] Specifically, the area or target to be blasted is divided into multiple sections, and multiple blasting holes are drilled for each section, into which explosives are inserted. After loading explosives into each of the drilled holes, they are connected to the blasting device. By detonating the detonators located in the blasting holes, the explosives are detonated, resulting in the blasting and collapse of the target.

[0004] In particular, blasting technology is used to create structures such as tunnels, roads, and building foundations for mining minerals or for construction purposes. A blasting hole is formed using a drilling device at the blasting site, explosives and detonators are installed, and the blasting hole is filled with a sealant to perform safe and efficient blasting.

[0005] That is, during blasting work, the sealant is installed inside the blast hole and the detonator is installed, and then the remaining part of the blast hole is filled with a sealant. Sand and clay are used as the sealant.

[0006] In addition, sealing is an important process that focuses the explosive power during blasting on the target area by filling the top of the blast hole with a sealing material, thereby increasing efficiency and reducing flying rocks, and is essential for optimizing the energy distribution of the explosion and ensuring the safety of the surrounding environment and personnel.

[0007] However, when blasting using conventional blasting materials, the degree of crushing is not good, so a separate crushing operation is required to load the crushed rock, and a separate operation to separate out large blocks during the loading process is required, which has the problem of low work efficiency.

[0008] In addition, there has been a recent increase in the construction of deep tunnels passing through urban areas, and the blasting efficiency of conventional blasting materials has been low, which has led to an increase in the blasting period and increased costs, and there has been a problem of increased inconvenience to residents around the blasting site due to noise and vibration during the blasting.

[0009] That is, the conventionally used pre-casting material, perforated rock powder, is widely used because it is easy to obtain on site, but it has the problem of having low compressive strength and wall friction, and being absorbed and scattered by the explosive pressure, resulting in insufficient pre-casting effect.

[0010] In addition, sand, a conventionally used preservative, was mixed with stone powder, which resulted in excessive dust generation and a decrease in tunnel excavation rate.

[0011] In addition, the crushed stone, which is a conventional filler, is used with a particle size of 6 mm to 13 mm or less, so the compaction density is low and the sealing effect is very poor, making it difficult to insert into the blast hole, which reduces workability and reduces the blasting efficiency due to the lack of compaction effect.

[0012] The purpose of the present invention is to provide a blasting sealant and a method for manufacturing the same, which have excellent sealing properties against blasting pressure by mixing oyster shells and an aqueous glycerin solution, and in which oyster shells increase friction with the blasting hole wall to improve blasting efficiency.

[0013] Another object of the present invention is to provide a blasting agent and a method for manufacturing the same that can ensure economic feasibility by effectively utilizing shell waste generated in large quantities.

[0014] In order to achieve the above purpose, one embodiment of a blasting precursor according to the present invention is characterized by mixing crushed shells and an aqueous glycerin solution.

[0015] In the present invention, the total weight of the coloring material may include 20 to 50 wt% of crushed shells.

[0016] In the present invention, the particles of the crushed shell may have a particle size of 0.3 to 5 mm.

[0017] In the present invention, the crushed shell material may be crushed oyster shell.

[0018] In the present invention, the glycerin aqueous solution may contain 25 to 50 wt% of glycerin and 20 to 40 wt% of water for a total of 100 wt% of the coloring agent.

[0019] One embodiment of the blasting precursor according to the present invention may further include xanthan gum.

[0020] One embodiment of the blasting filler according to the present invention may include 20 to 50 wt% of crushed shells, 25 to 50 wt% of glycerin, 20 to 40 wt% of water, and 2 to 8 wt% of xanthan gum, out of 100 wt% of the total filler.

[0021] One embodiment of the blasting precursor according to the present invention may have a specific gravity of 1.26 to 1.50.

[0022]

[0023] In order to achieve the above purpose, one embodiment of a method for manufacturing a blasting precursor according to the present invention is characterized by including a crushing step of crushing shells to prepare a crushed shell material, a glycerin aqueous solution preparation step of mixing glycerin and water to prepare a glycerin aqueous solution, and a raw material mixing step of mixing the glycerin aqueous solution and the crushed shell material.

[0024] In the present invention, the crushing step can crush the shells into a particle size of 0.3 to 5 mm using a crusher.

[0025] In the present invention, the crushing step can crush oyster shells.

[0026] In the present invention, the glycerin aqueous solution preparation step may additionally mix xanthan gum to prepare a glycerin aqueous solution.

[0027] In the present invention, the glycerin aqueous solution preparation step can be performed by mixing 25 to 50 wt% of glycerin and 20 to 40 wt% of water from 100 wt% of the total coloring material to prepare a glycerin aqueous solution.

[0028] In the present invention, the glycerin aqueous solution preparation step may be performed by mixing 25 to 50 wt% of glycerin, 20 to 40 wt% of water, and 2 to 8 wt% of xanthan gum from 100 wt% of the total coloring material to prepare a glycerin aqueous solution.

[0029] In the present invention, the raw material mixing step can manufacture a coloring material by mixing 20 to 50 wt% of crushed shells, 25 to 50 wt% of glycerin, and 20 to 40 wt% of water from 100 wt% of the total coloring material.

[0030] In the present invention, the raw material mixing step may be performed by mixing 20 to 50 wt% of crushed shell, 25 to 50 wt% of glycerin, 20 to 40 wt% of water, and 2 to 8 wt% of xanthan gum from 100 wt% of the total coloring material to produce a coloring material.

[0031] The present invention has excellent sealing properties against blasting explosive pressure by mixing oyster shells and a glycerin aqueous solution, and the oyster shells increase the friction with the blasting hole wall, thereby increasing the sealing effect, thereby minimizing blasting vibration and noise, improving blasting efficiency, shortening the blasting work period, and significantly reducing blasting work costs, as well as improving safety during blasting work.

[0032] The present invention can secure economic feasibility by effectively utilizing shell waste generated in large quantities, and has the effect of solving environmental problems caused by shell waste.

[0033] Figure 1 is a flow chart illustrating a method for manufacturing a blasting precursor according to the present invention.

[0034] Figure 2 is a drawing showing the results of a comparative analysis of the ejection speed of a general sand and an embodiment of the present invention through a gauge installed at the entrance of a blast hole in a numerical analysis model.

[0035] Figure 3 is a graph showing test data of a comparative example in which sand and a glycerin aqueous solution were mixed.

[0036] Figure 4 is a graph showing test data for an example of a blasting agent according to the present invention, which is a mixture of crushed oyster shells and an aqueous glycerin solution.

[0037] Figures 5 to 7 are graphs showing test data according to the content of xanthan gum in examples of blasting precursors according to the present invention.

[0038] *Explanation of major symbols in the drawing

[0039] S100: Crushing stage

[0040] S200: Preparation of aqueous glycerin solution

[0041] S300: Raw material mixing stage

[0042] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. However, the technical concept of the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed content is thorough and complete and to sufficiently convey the spirit of the present invention to those skilled in the art.

[0043] In this specification, when a component is referred to as being on another component, it means that it can be formed directly on the other component, or a third component can be interposed between them. Furthermore, in the drawings, the shapes and thicknesses of regions are exaggerated for the purpose of effectively explaining the technical content.

[0044] Additionally, although terms such as first, second, and third have been used to describe various components in various embodiments of this specification, these components should not be limited by these terms. These terms are only used to distinguish one component from another. Thus, what is referred to as a first component in one embodiment may be referred to as a second component in another embodiment. Each embodiment described and illustrated herein also includes its complementary embodiments. Additionally, the term "and / or" has been used herein to mean including at least one of the components listed before and after.

[0045] In the specification, singular expressions include plural expressions unless the context clearly indicates otherwise. In addition, terms such as "comprise" or "have" are intended to specify the presence of a feature, number, step, component, or combination thereof described in the specification, and should not be construed as excluding the possibility of the presence or addition of one or more other features, numbers, steps, components, or combinations thereof. In addition, in the present specification, "connection" is used to mean both indirectly connecting a plurality of components and directly connecting them.

[0046] In addition, when describing the present invention below, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

[0047] One embodiment of the blasting precursor according to the present invention is a mixture of crushed shell powder and an aqueous glycerin solution.

[0048] Glycerin aqueous solution is a mixture of glycerin and water, and is a water-soluble viscous fluid that greatly increases the sealing power inside the blast hole.

[0049] More specifically, one example of a blasting precursor comprises 20 to 50 wt% of crushed shells out of 100 wt% of the total.

[0050] The crushed shell material is an example of crushed oyster shells, and it is noted that other types of crushed shells can also be used.

[0051] The shell crusher increases the friction with the blasting hole wall, thereby increasing the blasting efficiency. It also has a dual effect of providing strong resistance to gas expansion and compression during blasting within the blasting hole, while increasing the friction with the blasting hole wall due to shear deformation, thereby greatly increasing the blasting efficiency.

[0052] In addition, the crushed shells are made from shells discarded as waste, such as oyster shells, and are an eco-friendly and economical material, which significantly reduces the manufacturing cost of the coloring material.

[0053] If the shell crushing material is included in less than 20 wt%, there is a problem that the friction with the blasting hole wall is insufficient and the effect of increasing the blasting efficiency is minimal. If the shell crushing material is included in more than 50 wt%, there is a problem that the sealing force inside the blasting hole is reduced due to insufficient glycerin solution.

[0054]

[0055] In addition, a glycerin aqueous solution containing 25 to 50 wt% of glycerin and 20 to 40 wt% of water relative to 100 wt% of the total colorant has a problem in that, if glycerin is contained in an amount of less than 25 wt%, the sealing power of the blasting hole is insufficient due to insufficient viscosity, resulting in a decrease in blasting efficiency.

[0056] In addition, when glycerin is included in more than 50% by weight, it is difficult to inject the sealant into the blast hole due to excessive viscosity during the sealing operation, and it is difficult to secure sealing power in the blast hole because it does not spread evenly within the blast hole, resulting in the generation of voids. In addition, there is a problem that the manufacturing cost of the sealant increases due to the addition of additives or processing steps to increase the viscosity of the sealant.

[0057] Sealing is the process of installing explosives and a detonator inside a blast hole and then filling the remaining portion of the blast hole. It is important to completely seal the remaining space, i.e. the empty space, inside the blast hole. By completely sealing the empty space, the power of the explosives is prevented from leaking out, which increases the blasting effect. It also improves the safety of the blasting operation by preventing the flame or sparks of the explosives from being emitted outside, and it can also have the effect of reducing the generation of after-gases.

[0058] That is, the pre-painting work is important to have a large frictional force with the blasting hole wall and to be firmly compacted to completely seal the empty space inside the blasting hole so as to increase the blasting efficiency, that is, to increase the blasting effect, ensure safety during blasting work, and reduce the generation of after-gas.

[0059] One embodiment of a blasting sealant according to the present invention increases friction with the blasting hole wall by using crushed shells, and completely seals the empty space in the blasting hole with a viscous fluid containing glycerin, thereby increasing friction with the blasting hole wall and being able to be compacted firmly, thereby completely sealing the empty space in the blasting hole.

[0060]

[0061] In addition, one embodiment of the blasting precursor according to the present invention is one in which the particles of the crushed shells have a particle size of 0.3 to 5 mm in order to increase the effect of the present invention, that is, the frictional force with the blasting hole wall.

[0062] If the particle size of the crushed shell is less than 0.3 mm, there is a problem that the friction with the blasting hole wall is insufficient and the effect of increasing the blasting efficiency is minimal. If the particle size of the crushed shell is more than 5 mm, there is a problem that an excessively large gap is created inside the blasting hole during sealing work and it is difficult to completely seal the inside of the blasting hole.

[0063] One embodiment of a blasting sealant according to the present invention further includes 2 to 8 wt% of xanthan gum based on 100 wt% of the entire sealant, thereby more efficiently increasing viscosity, increasing the duration of blast energy in the cavity, and efficiently suppressing blast scattering.

[0064] Xanthan gum is a polysaccharide produced through a process of recovering and purifying polysaccharides secreted by Xanthomonas campestris outside the cell using glucose and other nutrients as a nutrient. It is a mixture of sodium, potassium, and calcium salts of glucose, mannose, and glucuronic acid.

[0065] Xanthan gum has high solubility and dissolves well in water, has high viscosity compared to other thickeners, has high heat resistance, so its viscosity does not decrease even at high temperatures, and has freeze-thaw resistance, so its viscosity remains constant even after repeated freezing and thawing. It has the advantage of high emulsion stability by maintaining a constant viscosity regardless of temperature.

[0066] Accordingly, one embodiment of the blasting sealant according to the present invention includes xanthan gum, and maintains a constant viscosity regardless of the external temperature conditions, i.e., air temperature, during the sealing operation, thereby maintaining constant workability regardless of the season and completely sealing the inside of the blasting hole.

[0067] In addition, one embodiment of the blasting sealant according to the present invention can maintain a viscosity capable of completely sealing a blasting hole when sealing with a small amount of xanthan gum, and can relatively increase the content of crushed shells to maximize the friction with the blasting hole wall.

[0068] In addition, one embodiment of the blasting sealant according to the present invention can maintain a viscosity capable of completely sealing a blasting hole when sealing with a small amount of xanthan gum, and can relatively increase the content of crushed shells to maximize the friction with the blasting hole wall.

[0069] In addition, one embodiment of the blasting pre-curing agent according to the present invention includes xanthan gum, which has high heat resistance and a characteristic that the viscosity does not decrease even at high temperatures, thereby increasing the duration of the explosive energy in the cavity and efficiently suppressing blast scattering, thereby maximizing the blasting efficiency, and of course enabling blasting to be performed according to the set blasting area, increasing the accuracy of the blasting operation, and minimizing vibration and noise during the blasting operation.

[0070] In addition, one embodiment of the sealant according to the present invention can improve the crushing per blast hole by 10% or more compared to the existing one, and due to the improvement in blasting performance, the average crushing particle size can be produced in a smaller size by 40% compared to the existing large blasting, so that the ratio of the crushing target having an average crushing particle size of 300 mm or more is reduced by 21% compared to the existing method, thereby reducing the standard crushing ratio of the existing blasting method.

[0071]

[0072] In addition, one embodiment of the blasting precursor according to the present invention has a specific gravity of 1.26 to 1.50.

[0073] One embodiment of the blasting precursor according to the present invention has a specific gravity of 1.26 to 1.50 and can be packaged or injected in bulk form and used regardless of whether it is used in a water tank.

[0074]

[0075] Meanwhile, FIG. 1 is a flow chart illustrating a method for manufacturing a blasting preservative according to the present invention, and referring to FIG. 1, the method for manufacturing a blasting preservative includes a crushing step (S100) of crushing shells to prepare crushed shells, a glycerin aqueous solution preparation step (S200) of mixing glycerin and water to prepare a glycerin aqueous solution, and a raw material mixing step (S300) of mixing the glycerin aqueous solution and the crushed shells.

[0076] The crushing step (S100) crushes the shells into a particle size of 0.3 to 5 mm using various known crushers such as a disk crusher, ball crusher, roller crusher, and wheel crusher. An example of crushing oyster shells into a particle size of 0.3 to 5 mm is as follows.

[0077] The glycerin aqueous solution preparation step (S200) is an example of preparing a glycerin aqueous solution by additionally mixing xanthan gum.

[0078] The glycerin aqueous solution preparation step (S200) is, for example, a glycerin aqueous solution prepared by mixing 25 to 50 wt% of glycerin and 20 to 40 wt% of water with 100 wt% of the total coloring material.

[0079] In addition, the glycerin aqueous solution preparation step (S200) is an example of preparing a glycerin aqueous solution by mixing 25 to 50 wt% of glycerin, 20 to 40 wt% of water, and 2 to 8 wt% of xanthan gum from 100 wt% of the total coloring material.

[0080] The raw material mixing step (S300) is an example of manufacturing a coloring material by mixing 20 to 50 wt% of crushed shells, 25 to 50 wt% of glycerin, and 20 to 40 wt% of water from 100 wt% of the total coloring material.

[0081] Alternatively, the raw material mixing step (S300) is an example of manufacturing a coloring material by mixing 20 to 50 wt% of crushed shells, 25 to 50 wt% of glycerin, 20 to 40 wt% of water, and 2 to 8 wt% of xanthan gum out of 100 wt% of the total coloring material.

[0082] It is to be noted that the description of an embodiment of a blasting precursor manufactured by the method for manufacturing a blasting precursor according to the present invention is omitted due to redundancy as mentioned above.

[0083]

[0084] Meanwhile, one embodiment of the blasting sealant according to the present invention can be used by filling the entire blasting hole, or can be used by filling a portion of the blasting hole and filling the remainder with sand.

[0085] One embodiment of the blasting filler according to the present invention is such that after inserting explosives into a blasting hole, only a portion of the blasting hole is filled from above the explosives, and the remaining portion of the blasting hole is filled with sand.

[0086] That is, when the blasting sealant and sand according to the present invention are sequentially stacked on top of the explosive in the blast hole to seal the blast hole, the shock wave propagates as a compressive wave toward the blast hole entrance and the free surface during blasting, the tensile wave is reflected at the boundary of the heterogeneous medium (the sealant, the free surface), the crack is created in the rock (tensile crack creation) by the superimposed collision of the incident and reflected waves, and the explosive gas pressure penetrates the created crack, and the crack expands and is destroyed. This repeats the process, thereby increasing the pressure duration in the blast hole, thereby maximizing the blasting efficiency, as well as enabling the blasting to be performed according to the set blasting area, increasing the accuracy of the blasting operation, and minimizing vibration and noise during the blasting operation.

[0087] That is, the shock wave is transmitted from a high impedance material to a low impedance material, so that the reflected wave becomes dominant at the material boundary, and the shock wave is transmitted from a low impedance material to a high impedance material, so that there is no reflection of the shock wave, and the impact strength is greatly increased.

[0088]

[0089] Table 1 below shows the impedance values ​​of one embodiment of a colorant according to the present invention and typical colorant materials. A significant difference in impedance can increase the magnitude of the impact pressure and the duration of the pressure's action within the blast hole.

[0090] The impedance value of one embodiment of the sealant according to the present invention is more than twice that of sand, which is a general sealant, and it can also be confirmed that the sealant according to the present invention in the blast hole exhibits incompressibility against an explosion load and has excellent explosion transmission performance.

[0091] In Table 1, one example of a coloring agent according to the present invention is an example in which 35 wt% of crushed shells, 30 wt% of glycerin, 30 wt% of water, and 5 wt% of xanthan gum are mixed in 100 wt% of the entire coloring agent.

[0092] Density (kg / m3) Propagation speed (m / s) Impedance [(kg / (s)=Rayls] Air (air) 1330330 Sand 1,8007501.35×10 6 Water 1,0001,4801.48×10 6 Example 1 of the present invention 1,6002,0503.28×10 6

[0093] Table 2 below shows the physical properties of the sealant according to the present invention applied to the analysis. The Mie-Gruneisen equation of state (EOS) was applied. The sealant according to the present invention is a material used to effectively transfer the energy generated from an explosion to rock, and its impedance (resistance) is a key factor determining its interaction with the explosion. Utilizing the Mie-Gruneisen EOS allows for quantitative modeling of the physical changes that occur when a sealant interacts with a shock wave.

[0094] Density D (cm) 3 ) Propagation speed (m / s) Coefficients EoS Example of the present invention 1.62,0505.324 Shock

[0095]

[0096] Table 3 below and Figure 2 show the results of comparative analysis of the ejection speed of a general sealant sand and an embodiment of the present invention through a gauge installed at the entrance of a blast hole in a numerical analysis model, and Figure 2 (a) shows the results of a numerical analysis model for the ejection speed of a sand sealant, which is a comparative example of the present invention, and Figure 2 (b) shows the results of a numerical analysis model for the ejection speed of an embodiment of the present invention.

[0097] The relatively low ejection velocity results indicate that the blasting material has excellent resistance to blasting pressure.

[0098] After the explosion, the initial eruption in the blast zone began 1.9 ms after the explosion for sand, whereas for the embodiment of the present invention, it began at 2.2 ms. The initial eruption rate of the embodiment was relatively slow, at about 80% of that of the sand blast. This indicates that the embodiment efficiently absorbs blast energy and releases it more slowly than the sand, demonstrating the superior blast performance of the embodiment in managing blast loads.

[0099] Initial ejecting time (ms) Initial ejecting velocity (m / s) Relative blockage performance Sand (comparative example) 1.9225 1.00 Example of the present invention 2.2180 1.25

[0100]

[0101] Meanwhile, Table 4 below shows the results of an explosion pressure test for a comparative example of the present invention and an embodiment of the present invention, in which 1000 mm of explosives were inserted into a blast hole with a depth of 3200 mm and the remaining space in the blast hole was filled with sand sealant.

[0102] To measure the blast pressure inside a blast hole, an experimental system utilizing a PMC (pressure meter with cerabar) sensor capable of measuring instantaneous dynamic impact pressure was applied, and pressure data was collected using MREL's MicroTrap. The PMC sensor has a pressure measurement range of up to 50 MPa. To effectively measure the blast pressure inside a blast hole, the PMC sensor was inserted into a water-filled tube, sealed, and the sealed tube was inserted into the blast hole for experiments.

[0103]

[0104] Maximum pressure (MPa) Explosion pressure transfer time after detonation (ms) Effective duration of explosion gas pressure (ms) Comparative example 5.8 12.2 16.8 Example of the present invention 2.8 3 1.8 2 2 1.8

[0105] Looking at the experimental results in Table 4, the pressure measured by the PMC sensor in the comparative example was 5.8 MPa, and when the embodiment of the present invention was applied, it was 2.8 MPa, which is 48% of the comparative example. These values ​​are measurements of the explosion pressure transmitted to the upper part of the pre-crash area within the blast hole. The lower the pressure, the less the loss of explosion energy, which means that it was used to destroy the rock, and thus the explosive power is greatly increased.

[0106] Looking at the experimental results in Table 4 above, the time required for the explosive pressure to be transmitted to the measurement location after the detonation of the gunpowder was measured to be 12.2 ms for the comparative example and 31.82 ms for the example. Through the measurement of the time it takes for the blasting gas pressure to be transmitted from the bottom to the top and the effective duration of the total gas pressure, it can be seen that the longer the effective duration of the explosive gas pressure after the maximum pressure measurement, the better the ejection resistance of the entire color area.

[0107] In the comparative example, the effective duration was 16.8 ms, while in the embodiment of the present invention, the effective duration increased by approximately 5 ms to 21.8 ms. This means that the destructive energy acted within the blast hole for a longer period of time equivalent to the duration of the explosive pressure, thereby increasing the explosive power within the blast hole.

[0108]

[0109] Accordingly, the present invention can increase the explosive power at the time of detonation, and when setting the same blasting range, the amount of explosive can be reduced by 20 to 30%, thereby reducing noise and vibration generated during blasting.

[0110]

[0111] FIG. 3 is a graph showing test data of a comparative example in which sand and a glycerin aqueous solution were mixed, and FIG. 4 is a graph showing test data of an example of a blasting sealant according to the present invention in which crushed oyster shells and a glycerin aqueous solution were mixed, and test data of a comparative example in which a substitute other than crushed oyster shells was mixed with a glycerin aqueous solution and an example of the present invention in which crushed oyster shells and a glycerin aqueous solution were mixed are shown, respectively.

[0112] In Fig. 3, the comparative example of the present invention is a colorant mixed with 30 wt% of sand and 70% of an aqueous glycerin solution, and in Fig. 4, the exemplary embodiment of the present invention is a colorant mixed with 30 wt% of crushed oyster shells and 70% of an aqueous glycerin solution, and each is test data obtained by performing a rheological property test using a rheometer.

[0113] That is, FIG. 3 is test data obtained by performing a rheological property test using each rheometer for a comparative example of the present invention in which 30 wt% of sand and 70% of an aqueous glycerin solution were mixed, and FIG. 4 is test data obtained by performing a rheological property test using each rheometer for an example of the present invention in which 30 wt% of sand and 70% of an aqueous glycerin solution were mixed.

[0114] Comparing FIGS. 3 and 4, it can be seen that the embodiment of the present invention has a higher shear stress overall, and that the shear stress is 1.75 times higher than that of the comparative example.

[0115] In addition, the examples of the present invention including crushed oyster shells showed higher shear stress than the comparative examples of the present invention including sand at a shear strain rate.

[0116] That is, the critical shear velocity of the comparative example including sand was 80 (1 / s), and the critical shear velocity of the example including crushed oyster shells was 90 (1 / s).

[0117] Accordingly, the shear thickening reaction of the oyster shell mixed viscous fluid shows a phenomenon in which the viscosity greatly increases at a higher critical shear rate, and thus, the embodiment of the present invention can increase the sealing force of the blast hole and the frictional force of the blast hole wall due to shear deformation compared to the comparative example.

[0118]

[0119] Meanwhile, FIGS. 5 and 6 are graphs showing test data according to the content of xanthan gum in an example of a blasting precursor according to the present invention.

[0120] Figure 5 is test data obtained by performing a rheological property test using a rheometer on the first embodiment of the present invention, which includes 30 wt% of crushed oyster shells, 38 wt% of glycerin, 30 wt% of water, and 2 wt% of xanthan gum.

[0121] Figure 6 is a graph showing test data for a first embodiment of the present invention, which includes 30 wt% of crushed oyster shells, 35 wt% of glycerin, 30 wt% of water, and 5 wt% of xanthan gum, and is test data obtained by performing a rheological property test using a rheometer.

[0122] Figure 7 is a graph showing test data for a first embodiment of the present invention, which includes 30 wt% of crushed oyster shells, 32 wt% of glycerin, 30 wt% of water, and 8 wt% of xanthan gum, and is test data obtained by performing a rheological property test using a rheometer.

[0123] That is, in Figs. 5 to 7, examples of blasting paints according to the present invention were tested for rheological properties using a rheometer according to the content of xanthan gum, and the viscosity increase rate according to the content of xanthan gum was analyzed.

[0124] In the first embodiment of the present invention containing 2 wt% of xanthan gum, as shown in FIG. 5, the dynamic viscosity rapidly increased at a critical shear rate of 110 (1 / s), reaching a maximum of 550 Pa, and a 10% increase in the dynamic viscosity of the coloring agent was observed.

[0125] In the second embodiment of the present invention containing 5 wt% of xanthan gum, as shown in FIG. 6, the dynamic viscosity rapidly increases at a critical shear rate of 113 (1 / s) and reaches a maximum of 596 Pa, and an 8% increase in the dynamic viscosity of the coloring agent was observed compared to the first embodiment.

[0126] In the third embodiment of the present invention containing 8 wt% of xanthan gum, as shown in FIG. 7, the dynamic viscosity rapidly increases at a critical shear rate of 110 (1 / s) and reaches a maximum of 594 Pa, and there was no change in the critical shear rate of the shear thickening reaction compared to the second embodiment, and no significant increase in viscosity was observed.

[0127] Accordingly, it was confirmed that when xanthan gum is included in a content of 2 to 8 wt%, the dynamic viscosity of the sealant can be effectively increased, thereby effectively increasing the sealing force within the blast hole.

[0128]

[0129] The present invention has excellent sealing properties against blasting explosive pressure by mixing oyster shells and a glycerin aqueous solution, and the oyster shells increase the frictional force with the blasting hole wall, thereby increasing the sealing effect, thereby minimizing blasting vibration and noise, improving blasting efficiency, shortening the blasting work period, and significantly reducing the blasting work cost, as well as improving safety during blasting work.

[0130] The present invention can secure economic feasibility by effectively utilizing shell waste generated in large quantities, and solve environmental problems caused by shell waste.

[0131] While the present invention has been described in detail using preferred embodiments, the scope of the present invention is not limited to the specific embodiments described above, and should be interpreted in accordance with the appended claims. Furthermore, those skilled in the art will appreciate that numerous modifications and variations are possible without departing from the scope of the present invention.

Claims

1. A blasting precursor characterized by mixing crushed shells and an aqueous glycerin solution.

2. In claim 1, A blasting filler characterized in that it contains 20 to 50 wt% of crushed shells out of 100 wt% of the total filler.

3. In claim 1, A blasting precursor, characterized in that the particles of the above shell crushing material have a particle size of 0.3 to 5 mm.

4. In claim 1, The above-mentioned shell crushing material is a blasting precursor characterized by being made by crushing oyster shells.

5. In claim 1, A blasting paint coating material characterized in that the glycerin aqueous solution contains 25 to 50 wt% of glycerin and 20 to 40 wt% of water for a total of 100 wt% of the paint coating material.

6. In claim 1, A blasting precursor characterized by further comprising xanthan gum.

7. In claim 1, A blasting colorant, characterized in that it comprises 20 to 50 wt% of crushed shells, 25 to 50 wt% of glycerin, 20 to 40 wt% of water, and 2 to 8 wt% of xanthan gum, out of a total of 100 wt% of the colorant.

8. In claim 1, A blasting precursor characterized by a specific gravity of 1.26 to 1.

50.

9. A crushing step for preparing crushed shell material by crushing shells; A glycerin aqueous solution preparation step of preparing a glycerin aqueous solution by mixing glycerin and water; and A method for manufacturing a blasting precursor, characterized in that it includes a raw material mixing step of mixing the above glycerin aqueous solution and the above shell crushing material.

10. In claim 9, A method for manufacturing a blasting precursor, characterized in that the above crushing step crushes the shells into a particle size of 0.3 to 5 mm using a crusher.

11. In claim 9, A method for manufacturing a blasting precursor, characterized in that the above crushing step crushes oyster shells.

12. In claim 9, A method for manufacturing a blasting coating material, characterized in that the above glycerin aqueous solution preparation step comprises additionally mixing xanthan gum to prepare a glycerin aqueous solution.

13. In claim 9, A method for producing a blasting paint coating material, characterized in that the above glycerin aqueous solution preparation step comprises preparing a glycerin aqueous solution by mixing 25 to 50 wt% of glycerin and 20 to 40 wt% of water in 100 wt% of the total paint coating material.

14. In claim 9, A method for producing a blasting paint coating material, characterized in that the above glycerin aqueous solution preparation step comprises preparing a glycerin aqueous solution by mixing 25 to 50 wt% of glycerin, 20 to 40 wt% of water, and 2 to 8 wt% of xanthan gum from 100 wt% of the total paint coating material.

15. In claim 9, A method for manufacturing a blasting paint carrier, characterized in that the above raw material mixing step manufactures a paint carrier by mixing 20 to 50 wt% of crushed shells, 25 to 50 wt% of glycerin, and 20 to 40 wt% of water from 100 wt% of the total paint carrier.

16. In claim 9, A method for manufacturing a blasting paint-making material, characterized in that the above raw material mixing step mixes 20 to 50 wt% of crushed shells, 25 to 50 wt% of glycerin, 20 to 40 wt% of water, and 2 to 8 wt% of xanthan gum from 100 wt% of the total paint-making material to manufacture the paint-making material.

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