Design original condition
Copper, Lead and Zinc metal ore, the annual handling capacity = 700X300 = 210000T Q; ore bulk density = 2.6t / m 3, of the medium can be broken; largest ore particle size Dmax = 500mm, water content 4%; typical particle size characteristic curve .
Choose a crushing process plan
Due to the grinding operation, the single-stage ball mill dmax=12mm, d80=8.4mm
Total crushing ratio S=Dmax/dmax=500/12=41.67
Average crushing ratio Sa=41.67 1/3
Set S1=S2=3.7, S3=S/(S1S2)=3.04
Breaking ability
Working time 15 hours, operating rate 62.5%
Q1=720/15=48T/H=1152T/D
Fragmentation ratio
S1=S2=3.7, S3=S/(S1S2)=3.04
Maximum size of each segment
D1= Dmax/s1=500/3.7=135mm
D2= d1/s2=135/3.7=36.5mm
D3= d2/s3=36.5/3.04=12mm
Drainage port size
I1=d1/Z=135/1.60=84.375mm take 85mm
I2=d2/z=36.5/1.60=22.83mm take 20mm
I3=0.8x12=9.6mm take 10mm
Screen hole :
=1.2dmax=14.4mm take 14mm
Process description
The three-stage and one-closed process is simplified into two-stage and one-closed process
Feed quantity Q1=Q2=720T/D
Three-stage crushing Q3=Q1C=396
Cycle load C=1/E-1=55%
The sieve load Q4=1116T/D, the screening efficiency E=65%, and the sieve hole 14mm.
Equipment selection and parameter selection
Coarse crush : PE600X900, 1 set, feeding ore size 500mm, discharge port size 85mm, discharge size 135mm, crushing ratio 3.7, processing capacity 48t/h=26.7m 3 /h
Medium crush : PE250X1200, 1 set, feed size 135mm, discharge port size 22mm, discharge size 36.5mm, crush ratio 3.7, processing capacity 48t/h=26.7m 3 /h
Finely divided : PE250X1200, 1 set, ore size 36.5mm, discharge port size 10mm, discharge size 12mm, crushing ratio 3.04, processing capacity 26.4t/h=14.7m 3 /h
Screening : YA1530, 1 set, sieve hole 14mm-12mm, under the sieve product size dmax=12mm-10mm plateau motor 1 set.
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