Crusher info - Rohrer's Quarry
Primary Crusher - Centrifugal to Metal Discs
Motor - 300 hp x 745.7 Watts/hp = 223710 Watts = 223.710 KW
223.710 KW/3600 sec/hr = .062142 KWH
x 3600 sec/hr x 24 hr/day x 30 day/mo = 1.611e5 KW/mo
Feed - 2ft. - 4 ft. limestone Mohs Hardness 4.0
Ave. Kwh/mo. = 15573 or 15573/1.611e5 = 9.69% operating
Ave. tonnage/mo. = 84811 short tons
D sqrt(60/D) tons @ 60u
Dust created # 200 (75 micron) = 914 tons x .894 = 817.1
# 100 (150 microns) = 1259 tons x .632 = 795.7
# 50 (300 microns) = 1791 tons x .447 = 800.6
# 30 (600 microns) = 2724 tons x .316 = 860.8
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6688 3274.2/6688 = 49%
15573 Kwh/6688 tons = 2.328 Kwh/Ton for this particle distribution.
Using .49 x 6688 tons above, 2.328 Kwh/Ton/.49 = 4.75 Kwh/Ton @ 60u.
% dust = 6688/84811 = 7.89%
Vertical Shaft Crusher
Motor - 250 hp x 745.7 Watts/hp = 186425 Watts = 186.425 KW
186.425 KW/3600 sec/hr = .051785 KWH
or
Motor - 250 hp x 550 (ft-lb/sec)/hp = 137500 ft-lb/sec
3.76616e-7 KWH/ft-lb/sec x 137500 ft-lb/sec = .051785 KWH
Feed - AASHTO # 57 (3/8" to 1 1/2") (3+12)/8 =15/8 = 1.875" = 47,625u
12 tph of - #30 (600 micron) dust .051785 KWH/12 tph = .004315 KWH/Ton
If run at 85% of HP rating, .85 x .004315 KWH/Ton = .003668 KWH/Ton.
Average Graduation of - # 30 dust :
Sieve Size % Passing % Not Passing % Trapped
# 30 <= 600 u 99.9 .1 .1
# 50 <= 300 u 85.6 14.4 14.3
# 100 <= 150 u 61.8 38.2 23.8
# 200 <= 75 u 44.3 55.7 17.5
0.0 44.3
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100.0
Jerry Russell
The energy required to reduce solid rock to 60 micron powder is about 20 kwh/ton:
However, concrete is softer than rock, and a round number for the energy required
to crush concrete is around 1.5 kwh/ton: For other sizes, sqrt(60/D).