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Post by tygwyn on Aug 27, 2013 17:19:14 GMT -5
Anyone seen or can explain how this method works?
I understand its water pressure shot through a monitor to cut the coal,and there`s slurry everywhere,
And apparently its used in NZ.
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Post by John on Aug 28, 2013 9:08:36 GMT -5
Anyone seen or can explain how this method works? I understand its water pressure shot through a monitor to cut the coal,and there`s slurry everywhere, And apparently its used in NZ. Here's a paper on the subject Jim.Hydraulic coal mining
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Post by dazbt on Aug 28, 2013 16:25:41 GMT -5
It's interesting to read that the system works best or particularly better when there is roof weighting and in my opinion in much the same way as in mechanised Longwalling.
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Post by John on Aug 28, 2013 16:40:41 GMT -5
It's interesting to read that the system works best or particularly better when there is roof weighting and in my opinion in much the same way as in mechanised Longwalling. Interesting paper!! I've seen the open goldfields in northern California, just up the road from where I used to live, that were hydraulic worked with monitors, a bloody mess as well, it was made illegal.. Up until that NZ accident, I'd never heard of hydraulic mining in coal.
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Post by tygwyn on Aug 28, 2013 17:07:58 GMT -5
Thanks John,just the ticket.
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Post by dazbt on Sept 6, 2013 13:54:01 GMT -5
Perhaps not directly related to Jim's original question but might be of interest, in the 1990s trials were undertaken to determine the effect and possibility of applying extremely high water pressure through shearer cutter picks as an aid to 'pre-cutting' or relieving coal immediately prior to pick point impact, does anyone know if this system is being used now?
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Post by dibber on Nov 9, 2014 14:41:42 GMT -5
I Worked for THYSSEN mining at Manton colliery just before it closed in 1994, and we had two Voist Alpina AM75 machines with pick face flushing and the water for this came from a gullick dobson "chock" pump & 200 gallon tank on the pantechnicon,this delivered water to the cutting disks @2200psi the machine has two "pompom" discs side by side with 48 picks on each head, about 1.m in diameter, cutting from roof to floor and the high pressure water was delivered through FAS valves behind the pick, so water only came out when the pick was "in cut",from around 1 o'clock through to 6 o'clock, and when it was rotating towards the driver there was no water flowing AM75.pdf (201.66 KB)
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