The rationale for mine dust generation
Total environmental protection in mines no. 44 no. 1 of 2003
The rationale for mine dust generation
Mine dust control team
Liao ning mount 114001
Summary of the understanding that dust generation is an indispensable basis for research into dust sources and for developing prevention and control measures front
According to the mines
The practical needs of the anthropo-technologists provide many examples of the six dust-producing machines common in mines.
Key word for dust production from mines
In solid mineral mining, during processing, conventional mining,
Choosing, burning, foreign or chinese
How advanced is the dust
It's small, small, hydraulic, torque
Industrial processes, i. E. The process of pollination of the whole barrel of mine; explosion
In addition to blasting out the rock and breaking it into small, medium and large pieces, at the same time
Production of large amounts of powdered ore and powdered form of work area mines
All are thrown high; as far as the rough, medium, thin shredder is concerned until
Ball grinder, scavenger, etc. Are made into more nuanced particles
It's a whole ore pollination process; it's not just a thousand
It's also high-temperature roasting, sintering, group work, and..
Massive dust generation processes; all handling, transport, upgrading,
Reproduction, sifting, mixing, storage, etc., and roasting, burning air
In the heat exchange, every single one or two or three times
Massive dust.
Although, due to the nature of minerals, process processes, technical equipment status
In addition, the impact of multiple factors, such as production capacity and natural conditions, has resulted in
Production intensity, dust concentration, dust in different mines, processes
Sources are different, but they produce the same process
According to these sources, the following six mechanisms are used to produce dust from mining operations:
1 mechanical impact dust generation
Screeching rock with om 1 506, 7655. Production
As an example of this, it's precisely because of the impact of the pole, which is accepted by the head
6oj, 28. 3 ~ 35. 0 times/s shock and twister rectangular 1500
N? M, 1. 25 ~2. 5 r/s twists, 1. 34
~2. 22 mm/s (from the gold mine phosphorus),
The researcher who dug the mine into a cannon hole pointed out that the above-mentioned impact
Powerful, twisting rectangles and rock-crawling axes
Powder from a 40mm type of mime head against the surface of the perforated rock
At least: one is a gill receiving 14. 0~22. 6 per transfer
In the state of secondary shock, the blades per millimeter length will be 1. 5 j
The impact works directly at a depth of 0. 5 to 1. 5 in the pore rock
Mm and pollinating it; the second is 1. 25 to 2. 5 r/s,
1,500n? M's twisting rectangles will grind and cut
Triangular prisms that hit the mark break and pollute... Test proof that
The effect of the impact is mainly to grind, to cut, and to cut,
The particle size is quite large
About 21. 2 for 10m, i. E., if not wet
Dustproofing measures like rock screeching, and so on, every second
The amount of dust produced is about 1,000 mg.
Two blasts producing dust
As you know, mine blasts are when explosives explode
It's the heat that's formed, and it's the huge amount of gas that just swells
Exploding power
By pressure and shearing; ore in a condensed ring, blasted
Maximum force. Rocks are crushed, compressed and shattered in a moment
The most resilient, the most powdered; in the circle of destruction or throwing internal
The rock, although the explosive force is absorbed by the condensed circle
It's weak, but it's still quite powerful enough to destroy the mine mother
Connecting forces and throwing them out, and then the hard ore was not just thrown
Second-level enterprises in the carbon industry, rated national priority by the all china federation of trade unions
To the collective, to be awarded the "five ones"
The national coal industry civilised coal mines is awarded the honor of the institute. Claims
44 one
No. It's a pearl beneath tarzan's feet.
(date of receipt; 2002-07-29)
The rationale for mine dust generation
Fragmentation into pieces and powder, and it'll make it fast
A sharp collision of collisions during the shift is causing further damage
The above-mentioned powdered minerals will follow the explosion
The formation of the waves is full of blast areas and surrounding areas
Space.
Researchers point out that the main factors affecting bankruptcy are the removal of mines
Rock properties, explosive intensity, blast parameters, charge method, use or not
Units under the same conditions, in addition to such factors as implosion, crushing, etc
The most significant amount of mine explosives is consumed
For filling, there are 27 quarries in the shallow hole mining system, 1959-1968
2. O, fe6 per unit explosive consumption increase mines body
Increase in mining powder mine production by 8. 5
It also indicates that, under other conditions, when the parameters are the same, the nature of the mineral
The most visible is the shallow hole in the fe4 ore at f-10. Stay
Mining powder ratio 7. 2-9. 2 in mines and hardness in ores f
Six to eight fe6 ore fillings, and mining powder
14. 2-17. 8. According to statistics from tin mines, underground explosions
Production of dust represents 45. 6 per cent of the total amount produced by the extractive industry, compared to
It's a 4. 3 percentage point more dust from rock mining.
3 rubbed and squeezed to produce dust
The mineral material is scrambled, squeezed and flushed during the exercise
Collision, causing laxity or less rigid mass, especially in bulk
Elliptical parts are powdered, and as the crowd crashes, the pieces and the blocks
The air in the body will be squeezed out and will be powdered
The mineral particles and the powdered mineral particles attached to the mass surface
It's coming out quickly,
The convulsion of the horizontal backstammers the air stream with dust
In sharp, high-frequency friction squeezing
Sifting operations determination, initial dust production concentration: at wetting of rock
0. 5 ~ 1. 5 g/m., 3 ~ 6 g/m..
4 inducing air currents to produce dust
A mass of material or group powder that moves at a certain speed,
It can drive the air around its trajectory to produce a certain amount of energy along its path. Speed
Degree of movement, which is referred to as induced flow; induced flow
The speed of movement is proportional to the speed of motion of the material. When
Once the flow is created, it binds the surface of a massive object
Part of the powder in particulate matter or group powder ejected to air
This is when the gas is induced to abort the dust
The dust, the dust from the mine gate, the dust from the mine to the mine car, the high shelf. The skin. And..
The dust produced at the end of the offloading is induced. Gas
The flow of dust.
5 gas flow effects producing dust
In addition to the open-air mines, which are built as a result of natural wind, underground mines are built as a result of ventilation
Become air currents, or those resulting from the underwater blast wave, etc. Gas
Flows produce dust and increase due to higher air temperatures
The flow of gas causes particles to fly, especially in the material itself
When the temperature is high, it is accompanied by high-temperature gas flow of dust,
And it's causing particles to fly, on the other hand, to heat up. Objects
The particles in the material are themselves more evacuable and therefore large
It greatly increases the production of high-temperature materials
Zirconium, roasting, etc
It's not cold, it's burning
Belt, sintered per ton at 190-250 mm thick
Mines produce as much as 24-26 kg.
6 integrated role dust production
A combination of two or more of these roles
Production of dust. In fact, many of the dust from the mines is formed in combination
Like a belt transporter offloading the end of a belt and the material itself
The air flow from the relative motion of the air produces dust. Objects
Inducing the flow of dust and material during the material drop to the material sink
The impact and friction pressure of the bottom or shield produce dust..
Note: reduce material distances, fewer trans-shipments and less material
The impact, the lowering of the material gap, etc., can lead to 6-7o dust spots,
Reduced once, double-production of 30-50
Test certificate, 800 mm width and 1. 5 difference for belt transporter discharge
Between ~3om, for every 0. 5m increase, the amount of dust produced increases by 20%
25; similarly, the impact angles of material fall once up, and the dust rises
Studies show a difference between air induction and fallout
It's a positive.
(date of receipt: 2002-11-o1)
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