Mining Terms and Methodologies – Part-II

By -
·        Properties of Indian Coal
n  Limited Resources of Coking Coal
n  High Ash and Low Calorific Value thermal coal
n  Low Sulphur (less than 0.5%) and low phosphorous (less than 0.2%)
n  High ash fusion temperature
n  Inertinite and liptinite rich combustion friendly coal
·        First Non-coking coal washery of CIL is Piparwar Washery under CCL having capacity of     6.50 MT/year.
·        Kargali Washery is the oldest washery of Coal India formed in 1958.
·        Out of 29 states, coal field areas have been spread in 14 states. CIL operates in 8 states.
·        Mining Methods and configuration of HEMM used
n  Shovel + Dumper –  Can work in steep gradient upto 1 in 5
  Multi seam extraction
n  Surface Miner –       Can work in steep gradient upto 1 in 10 and flatter
Suitable for coal having compressive strength below 250   kg/CM2
n  Bucket Wheel Excavator – Used for lignite extraction
Suitable for coal having compressive strength upto 100 kg/CM2
n  Dragline --              Used for gradient flatter than 1 in 6
Not suitable for hilly geographic area
n  LHD (Load Haul Dumper) –  Capacity – 2 to 2.7 Cum
     Production – 150 – 200 Tonne/Day
Used for seam of 1 in 6 gradient with 2 m to 4 m   thickness.
n  SDL (Side Discharge Loader) –   Capacity – 1.0 Cum
Production – 120 Tonne/Day
Used for seam of 1 in 5 gradient of 2m to 3.5 m thichness.
n  Mechanized Drivage Machines – Rate of Drivage – 6m/Day
Production – 150 T/Day
Seam Thickness – 2m to 4 m
n  Continuous Miner –  Rate of drivage – 50m/day
  Production – 1500T/day
  For seam 1 in 5 gradient & 3m to 4 m thichness.
n  Mechanized Roof Bolting – Bolting Capacity – 240 bolts/day
  Suitable for seam of 1 in 5 & 2m to 5m          thichness.
·        CHP/CPP(Coal Handling Plant/Coal Preparation Plant)
n  Objective of CHP/CPP
-- To supply the processed coal to bunkers for boiler operation.
-- To stack the coal to coal yard.
n  Apparatus used in CHP
-- Wagon Tippler
-- Hopper
-- Feeder
-- Conveyor Belt
-- Idler
-- Surge Hopper
-- Vibrating Screen
-- Crushers
-- Tripper Trolley
-- Magnetic Seperator
n  Operational Cycle of CHP/CPP
-         Bunkering
-         Stacking
-         Reclaiming
Three stage crushing system is used in CHP/CPP
Stage 1 -- DRCR(Double Roll Crusher Room)- Coal of 600mm size are crushed into 250mm size
Stage 2 -- RBCR(Rotary Breaker Crusher Room) – Coal of 250mm size are crushed into 80mm size
Stage 3 -- Impact Crusher – Coal of 80mm size are crushed into 20-25mm size
·        Explosives used in Coal Mines are classified into three categories
P1                                P3                                            P5                               
Powergel P-101         Powergel P-301                    Powergel P-501
Indocoal-1                 Indocoal-3                             Indocoal-5
Godyne                      Permadyne                            Pentadyne
Solarcoal-1                Solarcoal-3                            Solarcoal-5


·        In underground mines percentage of carbon dioxide must not be greater than 0.5% and percentage of oxygen must be greater than 19% for ideal working conditions.

h    * Percentage of ash, moisture and other volatile contents in coal is anatomized through Proximate Analysis and percentage of hydrogen, Nitrogen, Oxygen, Sulphur etc is anatomized through Ultimate Analysis.

   

Comments

Post a Comment

Popular posts from this blog

MCQ Practice Session - 5

By -
1.          NCWA stands for: a)      National Coal Wage Arrangement b)      National Coal Wage Agreement c)      National Coal Washery Association d)      Not known 2.         Effective period of which NCWA was of 4 and ½ years: a)      NCWA-III           b) NCWA-IV                 c)  NCWA-V 3.         The percentage of Minimum Guaranteed Benefit in NCWA-IX is: a)      24%                    b)  25%                   ...
Read more

History of SLU/SLP/SLI & SLW in CIL

By -
History of SLU/SLP/SLI & SLW in CIL The provision of upgradation to the next higher grade/category in respect of non-executive employees who remained in the same grade/category for more than 10 years was first introduced in the operation period of NCWA-IV and was brought in effect from 01-07-1989 which continued progressively on 01-07-1990, 01-07-1991 and so on. The said provision was made effective vide Implementation Instruction No-3 of NCWA-IV. In the subsequent NCWA as well, the above provision was continued to be in operation vide clause-2.11.0 of NCWA-V with effect from 01-07-1994 and thereafter on 01-07-1995. It was also agreed that if any reduction in the period of 10 years for the purpose of upgradation is mutually decided at later stage of time, the same would be effective from 01-01-1996. In the subsequent NCWA i.e. NCWA-VI (01-07-1996 to 30-06-2000), the period of 10 years was reduced to 7/8 years in UG/Surface respectively and the same was termed as SLU (Service ...
Read more

MCQ Practice Session-8

By -
1.      Which of the following equipments are chain mounted? a) Side Discharge Loader b) Load Haul Dunper c) Both d) None 2.      Which of the following is a mass production technology for UG? a) SDL b) LHD c) PSLW (Power Support Long wall) d) None 3.      In which OCP, In-pit-crushing and conveying system is used for? a) Gevra Mine b) Dipka Mine c) Piparwar d) Jagannath 4.      SDL & LHD in UG are used for…………… a) Transporting b) Loading c) Cutting d) Drilling 5.      What are the characteristics of imported coal? a) Low ash & moisture b) High Sulphur c) Both a) & b) d) None 6.      Under New Coal Distribution Policy(NCDP), Coal is sold by CIL through……… a) Fuel Supply Agreement(FSA) b) Memorandum of Understanding(MOU) c) E-auction d) All of the above 7.      Which of the fol...
Read more