Dry water stemming for mine blasting operations and method of operation thereof

Abstract

The application discloses a dry water stemming for mine blasting operation and a working method thereof, which is mainly formed by mixing dry water material, CuCl2+MgCl2 modified dry water material and NaHCO3 modified dry water material, wherein the mass ratio of the dry water material is 89% to 96%, the mass ratio of the CuCl2+MgCl2 modified dry water material is 4% to 10%, and the mass ratio of the NaHCO3 modified dry water material is 0.4% to 1%; the dry water material is formed by gas-phase hydrophobic SiO2 and water under the action of high-speed stirring and shearing; the CuCl2+MgCl2 modified dry water material is formed by gas-phase hydrophobic SiO2 and CuCl2+MgCl2 aqueous solution under the action of high-speed stirring and shearing; and the NaHCO3 modified dry water material is formed by gas-phase hydrophobic SiO2 and NaHCO3 aqueous solution under the action of high-speed stirring and shearing. The application enhances the adsorption effect on the dust, CO, SO2, H2S and NOx after blasting, can better play a plugging role, realizes the purpose of on-site solidification of the blasting smoke, improves the utilization rate of the detonation wave and reduces the harmful effect of blasting.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of dry water stemming for mine blasting operation and its operation method. BACKGROUND

[0002] Mining and tunneling work need to be carried out blasting operation, a large amount of gun smoke and dust will be produced in the blasting process, CO, NO, NO2, SO2, H2S and other toxic and harmful substances contained in the gun smoke, these toxic and harmful substances have a serious impact on the underground production environment, and will harm the health of the operating personnel, thereby reducing the labor efficiency of underground operation, serious gun smoke poisoning accident will be caused, and bring devastating disaster to workers and enterprises.

[0003] Currently, the mine generally adopts mechanical ventilation to discharge the gun smoke. With the extension of the mining depth and the expansion of the mining face, and most of the metal and non-metal mines in China are in the state of multi-section simultaneous mining, the mine ventilation system is more and more complex, and the ventilation cost is also more and more large. The gun smoke of the deep and remote mining and tunneling working face is more and more difficult to be effectively discharged to the surface. Sometimes, a large number of wind pipes and local fans need to be erected to discharge the gun smoke in these areas, which is time-consuming and laborious and cannot achieve good results. Although some mines have used water stemming to plug the blast hole, on the one hand to increase the blasting effect, and on the other hand to purify the blasting operation face. However, the water bubble mud mainly relies on water adsorption, and the pure water adsorption capacity is limited, and it cannot purify CO which is insoluble in water, so the purification effect is not satisfactory. In addition, the adsorbed toxic and harmful gases of the water bubble mud are easily volatilized after the blasting operation, causing secondary pollution.

[0004] Therefore, it has become a difficult problem for technical personnel in the field of mining engineering to seek a simple and effective method with reasonable cost and to prevent secondary pollution to purify the underground gun smoke. SUMMARY

[0005] The present application aims to overcome the defects of the prior art, and provides a dry water stemming for mine blasting operation and its operation method, to solve the problem that a large amount of gun smoke and dust is produced in the current mine blasting operation, especially the CO, SO2, NO, NO2, H2S and other toxic and harmful substances contained in the gun smoke are difficult to purify.

[0006] The dry water stemming for mine blasting operation of the present application is mainly composed of dry water material, CuCl2+MgCl2 modified dry water material and NaHCO3 modified dry water material, wherein the mass ratio of dry water material is 89% to 96%, the mass ratio of CuCl2+MgCl2 modified dry water material is 4% to 10%, and the mass ratio of NaHCO3 modified dry water material is 0.4% to 1%.

[0007] Optionally, the dry water material is formed by gaseous hydrophobic SiO2 and water under high-speed stirring and shearing action, and the weight ratio of gaseous SiO2 powder to water is 11:100 to 19:100.

[0008] Optionally, the CuCl2+MgCl2 modified dry water material is formed by reacting fumed hydrophobic SiO2 with a CuCl2+MgCl2 aqueous solution under high-speed stirring and shearing. The weight ratio of fumed SiO2 powder to CuCl2+MgCl2 aqueous solution is 1:20 to 1:10, and the molar concentration of CuCl2 in the CuCl2+MgCl2 aqueous solution is 2.5 to 3.2 kmol / m³. 3 The molar concentration of MgCl2 is 5.0–5.5 kmol / m 3 .

[0009] Optionally, the NaHCO3 modified dry water material is formed by the reaction of gaseous hydrophobic SiO2 and NaHCO3 aqueous solution under high-speed stirring and shearing action. The weight ratio of gaseous SiO2 powder to NaHCO3 aqueous solution is 1:20 to 1:10, and the NaHCO3 aqueous solution contains 0.4% to 0.6% NaHCO3 by weight.

[0010] Optionally, the high-speed stirring is performed at a speed of 2400 rpm / min for a time of 5 to 8 minutes.

[0011] The present invention describes a method for using the aforementioned dry water-based gunning mud in mine blasting. The method involves loading the mixed dry water-based gunning mud into polyethylene bags, then sealing the blast hole. After the explosive detonates, the dry water-based gunning mud forms powder. The dry water material is used to adsorb dust, H2S, and SO2; the CuCl2+MgCl2 modified dry water material is used to adsorb CO; and the NaHCO3 modified dry water material is used to adsorb nitrogen oxides. The powder settles under gravity. The dry water-based gunning mud serves two purposes: firstly, it enhances the blasting effect; secondly, the dry water and modified dry water materials in the mud comprehensively purify the dust and toxic gases generated during blasting. Furthermore, the toxic and harmful substances are solidified within the solid particles of the dry water and modified dry water materials, preventing them from volatilizing and causing secondary pollution.

[0012] This invention relates to a dry water-based foaming mud, which utilizes dry water materials and modified dry water materials. The liquids (water, CuCl2+MgCl2 aqueous solution, NaHCO3 aqueous solution) are dispersed into tiny droplets, which are then uniformly coated with hydrophobic gaseous SiO2 powder to form a stable powdery substance with excellent dispersibility, flowability, and high specific surface area. Therefore, the adsorption capacity and smoke purification effect of this dry water-based foaming mud far surpass those of existing water mist and water-based foaming mud. This dry water-based foaming mud can not only purify dust but also CO, SO2, H2S, and NO. xThe toxic and harmful gases in the gun smoke are mixed with various dry water modification materials to purify all kinds of toxic and harmful substances in the gun smoke, and the gun smoke is completely purified and solidified on site to prevent the gun smoke from being diffused again, which is beneficial to subsequent treatment. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a schematic diagram of the dry water gun mortar formed by the present application.

[0014] Reference signs: gas-phase hydrophobic SiO2 powder 1, water 2, CuCl2+MgCl2 aqueous solution 3, NaHCO3 aqueous solution 4, dry water material 5, CuCl2+MgCl2 modified dry water material 6, NaHCO3 modified dry water material 7, polyethylene bag 8, dry water gun mortar 9 of the present application. DETAILED DESCRIPTION

[0015] From Figure 1 It can be seen that the dry water gun mortar 9 of the present application is mainly formed by mixing the dry water material 5, the CuCl2+MgCl2 modified dry water material 6 and the NaHCO3 modified dry water material 7, and then being loaded into the polyethylene bag 8, and the mass ratio of the dry water material is 89% to 96%, the mass ratio of the CuCl2+MgCl2 modified dry water material is 3.6% to 10%, and the mass ratio of the NaHCO3 modified dry water material is 0.4% to 1%, wherein:

[0016] The dry water material 5 is formed by mixing the gas-phase SiO2 powder 1 and the water 2 under the action of high-speed stirring and shearing, and the weight ratio of the gas-phase SiO2 powder 1 to the water 2 is 11:100 to 19:100;

[0017] The CuCl2+MgCl2 modified dry water material 6 is formed by mixing the gas-phase SiO2 powder 1 and the CuCl2+MgCl2 aqueous solution 3 under the action of high-speed stirring and shearing, and the weight ratio of the gas-phase SiO2 powder 1 to the CuCl2+MgCl2 aqueous solution 3 is 1:20 to 1:10, and in the CuCl2+MgCl2 aqueous solution, the molar concentration of CuCl2 is 2.5 to 3.2 kmol / m 3 , and the molar concentration of MgCl2 is 5.0 to 5.5 kmol / m 3 ;

[0018] The NaHCO3 modified dry water material 7 is formed by mixing the gas-phase SiO2 powder 1 and the NaHCO3 aqueous solution 4 under the action of high-speed stirring and shearing, and the weight ratio of the gas-phase SiO2 powder 1 to the NaHCO3 aqueous solution 4 is 1:20 to 1:10, and the NaHCO3 aqueous solution contains 0.4% to 0.6% of NaHCO3 by weight.

[0019] After the above dry water material 5, CuCl2+MgCl2 modified dry water material 6, NaHCO3 modified dry water material 7 are prepared, the dry water material accounts for 89%~96%, the CuCl2+MgCl2 modified dry water material accounts for 3.6%~10%, and the NaHCO3 modified dry water material accounts for 0.4%~1% according to the mass ratio, and the dry water explosive is formed under the mixing of high-speed stirring and shearing, then the dry water explosive is loaded into a polyethylene bag, and the charging hole is blocked, and the dry water explosive purifies the dust and the gun smoke when the explosive explodes.

[0020] The above high-speed stirring is at a speed of 2400 rpm / min, and the stirring time is 5~8 min.

[0021] According to the above components and forming process of the present application, some experiments are made by the inventor, and some embodiments are given below for illustration, and the specific steps are as follows:

[0022] I. Determination of optimal concentrations of CuCl2+MgCl2 aqueous solution and NaHCO3 aqueous solution:

[0023] The optimal concentration experiment is carried out in the laboratory fume hood, different concentrations of solutions are prepared in advance, 15 mL of each solution is taken in a flask, the flask is covered with a flip plug, nitrogen gas is introduced into the flask, 30 mL of simulated gun smoke (various gun smoke contents, which have been prepared in advance) is introduced into the flask, and the purification effect is determined. The final economic and reasonable concentration range of each solution is: the molar concentration of CuCl2 is 2.5~3.2 kmol / m 3 , the molar concentration of MgCl2 is 5.0~5.5 kmol / m 3 , and the mass concentration of NaHCO3 is 0.4%~0.6%.

[0024] In the following embodiments, the molar concentration of CuCl2 is 3 kmol / m 3 , the molar concentration of MgCl2 is 5 kmol / m 3 , and the mass concentration of NaHCO3 is 0.5%.

[0025] II. Determination of material ratio of each embodiment:

[0026]

[0027] III. Selection of high-speed stirring equipment: the stirring speed is 2400 rpm / min, and the stirring time is 5~8 min.

[0028] IV. Formation of dry water material, CuCl2+MgCl2 modified dry water material and NaHCO3 modified dry water material:

[0029] Dry water material: mixing of fumed hydrophobic SiO2 and water under high-speed stirring shearing, the ratio is selected according to the above embodiment ratio table.

[0030] CuCl2+MgCl2 modified dry water material: mixing of fumed hydrophobic SiO2 and CuCl2+MgCl2 aqueous solution under high-speed stirring shearing, the ratio is selected according to the above embodiment ratio table.

[0031] NaHCO3 modified dry water material: mixing of fumed hydrophobic SiO2 and NaHCO3 aqueous solution under high-speed stirring shearing, the ratio is selected according to the above embodiment ratio table.

[0032] Five, dry water mortar formation: the dry water material prepared in step four, CuCl2+MgCl2 modified dry water material, NaHCO3 modified dry water material are mixed under high-speed stirring according to the ratio of each component determined in step three, to form the dry water mortar of the application.

[0033] Six, simulation of gun smoke purification test: according to the composition of toxic and harmful gas components in simulated gun smoke, the ratio determined in steps one and two is tested one by one for each embodiment.

[0034] Test of example one: dry water mortar formed in example one is sampled for 9 times, and the concentration of toxic and harmful substances in the purified gun smoke is as follows:

[0035] Table 1 test results of dust in air after purification of example one

[0036]

[0037] Table 2 test results of O2 and harmful gas after purification of example one

[0038]

[0039] Test of example two: similarly, 9 samples are taken in sequence, and the concentration of toxic and harmful substances in the purified gun smoke is as follows:

[0040] Table 3 test results of dust in air after purification of example two

[0041]

[0042] Table 4 test results of O2 and harmful gas after purification of example two

[0043]

[0044] Test of example three: similarly, 9 samples are taken in sequence, and the concentration of toxic and harmful substances in the purified gun smoke is as follows:

[0045] Table 5 Dust test results in purified air in Example 3

[0046]

[0047] Table 6 O2 and harmful gas test results in purified air in Example 3

[0048]

[0049] Test of Example 4: 9 samples were taken in succession, and the concentration of toxic and harmful substances in the purified fume was determined as follows:

[0050] Table 7 Dust test results in purified air in Example 4

[0051]

[0052] Table 8 O2 and harmful gas test results in purified air in Example 4

[0053]

[0054] Test of Example 5: 9 samples were taken in succession, and the concentration of toxic and harmful substances in the purified fume was determined as follows:

[0055] Table 9 Dust test results in purified air in Example 5

[0056]

[0057] Table 10 O2 and harmful gas test results in purified air in Example 5

[0058]

[0059] From the test results of the above several examples, it can be seen that the dry water mortar of the present application is used for mine blasting operation, and has a significant purifying effect on blasting fume, can make the air dust concentration test result qualified rate 100%, and make the air each toxic and harmful substance qualified rate 100%. It can be directly used for purifying fume in mine blasting operation.

Claims

1. A dry water stemming for use in mine blasting operations, characterised in that, The dry water material, CuCl2+MgCl2 modified dry water material and NaHCO3 modified dry water material are mixed, wherein the dry water material accounts for 89-96% in mass ratio, the CuCl2+MgCl2 modified dry water material accounts for 4-10% in mass ratio, and the NaHCO3 modified dry water material accounts for 0.4-1% in mass ratio; the dry water material is formed by gas-phase hydrophobic SiO2 and water under the action of high-speed stirring and shearing; the CuCl2+MgCl2 modified dry water material is formed by gas-phase hydrophobic SiO2 and CuCl2+MgCl2 aqueous solution under the action of high-speed stirring and shearing; and the NaHCO3 modified dry water material is formed by gas-phase hydrophobic SiO2 and NaHCO3 aqueous solution under the action of high-speed stirring and shearing; The gas-phase SiO2 powder and water are mixed in a weight ratio of 11:100-19:100; the gas-phase SiO2 powder and CuCl2+MgCl2 aqueous solution are mixed in a weight ratio of 1:20-1:10; and the gas-phase SiO2 powder and NaHCO3 aqueous solution are mixed in a weight ratio of 1:20-1:

10.

2. Dry water stemming for use in mine blasting operations according to claim 1, characterized in that, CuCl2+ MgCl2 aqueous solution, CuCl2 molar concentration is 2.5-3.2 kmol / m 3 , MgCl2 molar concentration is 5.0-5.5 kmol / m 3 .

3. The dry water stemming for use in mine blasting operations according to claim 1, characterized in that, The NaHCO3 aqueous solution contains 0.4-0.6% of NaHCO3 by weight.

4. Dry water stemming for use in mine blasting operations according to claim 1, characterized in that The high-speed stirring is performed at a speed of 2400 rpm / min for 5-8 min.

5. A method of using the dry water stemming of claim 1 in a mine blast, characterized by The mixed dry water stemming is put into a polyethylene bag, and then the stemming hole is blocked; when the explosive is exploded, the dry water stemming purifies dust and gun smoke.

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