Overview of Water Medium Energy Exchange Blasting Technology
Water medium energy exchange blasting is an analysis of the blasting mechanism from the perspectives of thermodynamics and chemistry. If in&quo; Explosion Thermodynamic system; Add&quo; to; A certain amount; According to the law of thermodynamics and the law of indestructibility of matter (Conservation of mass); Yes;, In the adiabatic; Explosion Thermodynamic system; It is well known that water is the easiest substance to absorb or release energy by converting it into internal energy of water. At atmospheric pressure, when the temperature reaches 2000 ℃, it begins to decompose into hydrogen and oxygen, accumulating the explosive energy of water and the explosive gas substance coexisting with the explosive. At a high temperature of 3000 ℃, the explosive explodes for 10 times; Under high pressure conditions of 104MPa, further chemical reactions will occur to generate new substances such as H2, O2, CO2, and NO2< Br/>
The calculation shows that the volume of these gaseous substances detonated at high temperature and pressure has increased by 1100 times under Standard temperature and pressure. Because these gaseous substances are highly compressed, they have accumulated huge potential energy, which will follow the instantaneous detonation theory; The dispersion of detonation products follows the law of equidistant surface groups;, The blasting operation is mainly completed by squeezing and crushing the blasted medium through rapid expansion< Br/>
&Ldquo; Water medium energy exchange blasting” According to the Ideal gas law, the explosion pressure of the explosive on the hole wall can reach 330Mpa under the quasi-static condition after the completion of the explosion. According to the blasting theory, the peak explosion pressure of the explosive can be increased by 10 times. Therefore, the peak explosion pressure of the explosive on the hole wall can reach 3300Mpa, 6.6 times the pressure of carbon dioxide explosion on the hole wall. According to the theoretical calculation of the peak explosion pressure of engineering blasting, it can even reach 4661Mpa. Therefore, theoretical calculations indicate that" Water medium energy exchange blasting” Mainly relying on the mixture of water medium and explosives to generate gaseous substances, the explosive medium is compressed and crushed by rapid expansion to complete the blasting operation< Br/>
nine hundred thousand nine hundred and one
Geological conditions of blasting
The experimental area is located in the central part of the Xishan 195 platform, with good geological conditions. The rocks are mainly medium thick block structured limestone, with slightly developed joints and fissures. The rock's explosiveness is of medium to high grade throughout the entire mining area. The step slope is flat without any depression, and the front resistance line is not too large or too small. The experimental conditions are good.
Perforation operation situation
&Nbsp& Nbsp& Nbsp; Use CM30 drilling rig to drill holes with a diameter of 168mm, using 80° The inclined blast hole was drilled normally on site, and no karst caves or crack holes were found. The actual hole depth was basically within the deviation range of the designed hole depth, with a surface layer of virtual debris of 3-5 meters. Some blast hole openings had poor wall quality.
Description of on-site operation process
1) Construction process

Selection of experimental area& M. 5
5 * 3
five point two
two point three
eight point eight
two hundred and twenty-two
two hundred and ten
sixteen point five
seven point five
5 * 3
five
two point five
nine
227 & Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp& Nbsp;
total
&Nbsp;
&Nbsp;
297
&Nbsp;
46.2 meters
181.8 meters
4585kg
&Nbsp;
Water bag parameters
The diameter of the water bag is 75mm, and the length is 60cm. Three bags are bundled and lifted on site, and measured to be about 50cm after being placed into the hole; Due to the discrepancy between the specifications of the water bag and the diameter of the blast hole, the difficulty and time of on-site operation have increased, resulting in an increase of approximately 1/3 in blasting operation time; A large number of water bags are filled with waterThe amount of ore dropped during blasting is 29110 tons, and the unit explosive consumption has decreased by 0.04 kg/t.
Analysis of blasting effect
After on-site inspection and analysis after the explosion, it was found that the overall blasting effect was good, with a tight and loose pile, and obvious throwing. The throwing distance was about 30 meters, and the settlement height of the pile was about 2-3 meters, which was higher than before. No obvious large blocks were found on the surface, and the overall ore block size was slightly larger than before. There is a slight post shock cracking phenomenon after the explosion, and the side shock cracking is obvious< Br/>
The west side of the blasting pile is equipped with R984 for shovel loading, while the east side is equipped with CAT988 for shovel loading. The looseness of the blasting pile has decreased compared to the previous normal blasting, but it basically does not affect the shovel loading efficiency. The CAT988 shovel loading on both sides is not complete, and there is no obvious foundation after shovel loading< Br/>
In terms of harmful effects of blasting, there are no flying stones or blasting after blasting; The blasting vibration is significantly reduced, and there is basically no vibration outside 300 meters; The blasting noise is relatively low, and the powder ore rate (dust) generated during the blasting operation is reduced. However, due to the high amount of dust caused by the ore thrown to the ground during blasting, there is still no significant improvement in the dust after blasting.
diesel engine
model
D10.36T20
Operating speed
1850rpm
Manufacturing factory
Steyr
Fuel tank capacity
480L
Rated power
266kw
&Nbsp;
&Nbsp;
screw compressor
Manufacturing factory
chigo
Exhaust air volume
18 m3/min
&Nbsp;
Head manufacturing factory
GHH
Maximum wind pressure
17bar
Functional parameters
Aperture range
110-152 mm
Supporting impactor
4inch, 5inch
Automatic drill hole depth change
28m
Rotation speed
0-105 r/min
Drill pipe diameter
89mm/102mm
Rotational torque
4310N. M
Number of drill bits stored
6+1
Drill pipe length
4m
Recommended aperture
138mm
&Nbsp;
&Nbsp;
Drill arm function
Drill arm form
Single straight arm
Promotion method
Oil cylinder steel wire method
Total length of thruster
eight hundred and ten