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Safety and Health Topics > Mineral Processing Dust Control > Reducing Respirable Dust Levels > Appendix. - Test Results

Appendix. - Test Results
 
Table A-1.-Gravimetric Results at field evaluation site 1:  Normal system
Day Gravimetric Dust weight gain, Run time, Concentration,
    mg min mg/m3
LOCATION 1
1. . . . . . . . . 3 1.402 392 2.10
  4 1.377 393 2.06
  5 1.296 393 1.94
2. . . . . . . . . 13 1.350 394 2.02
  14 1.388 395 2.07
  15 1.436 394 2.14
3. . . . . . . . . 23 1.554 246 3.72
  24 0.890 246 2.13
  25 1.554 246 2.05
4. . . . . . . . . 33 0.841 326 1.52
  34 0.828 326 1.49
  35 .0625 326 1.13
     Av . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.03
LOCATION 2
1. . . . . . . . 9 0.816 391 1.23
  10 0.922 391 1.39
2. . . . . . . . 19 0.829 393 1.24
  20 1.170 393 1.75
3. . . . . . . . 29 0.658 248 1.56
  30 0.591 248 1.40
4. . . . . . . . 39 0.626 326 1.13
  40 0.608 326 1.10
    Av . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.35
LOCATION 3
1. . . . . . . . 1 1.119 407 1.62
2. . . . . . . . 11 1.481 395 2.21
3. . . . . . . . 21 0.559 246 1.43
4. . . . . . . . 31 0.851 326 1.54
   Av . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.70
LOCATION 4
1. . . . . . . . 2 1.378 380 2.10
2. . . . . . . . 12 1.271 395 1.89
3. . . . . . . . 22 1.227 246 2.93
4. . . . . . . . 32 0.937 327 1.69
   Av . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.15

 
Table A-2.-Gravimetric Results at field evaluation site 1:  B&BCD
Day Gravimetric Dust weight gain, Run time, Concentration,
    mg min mg/m3
LOCATION 1
6. . . . . . . . . 43 0.671 319 1.24
  44 0.496 319 0.92
  45 0.562 319 1.04
7. . . . . . . . . 53 0.597 362 0.97
  54 0.620 361 1.01
  55 0.653 361 1.06
8. . . . . . . . . 63 0.505 426 0.70
  64 0.887 426 1.23
  65 0.825 426 1.14
9. . . . . . . . . 73 0.913 361 1.49
  74 1.162 361 1.89
  75 1.108 361 1.81
10. . . . . . . . . 85 0.604 187 1.90
  86 0.638 187 2.01
  87 0.452 188 1.41
     Av . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.32
LOCATION 2
6. . . . . . . . 49 0.668 318 1.24
  50 0.740 318 1.37
7. . . . . . . . 59 0.076 360 0.13
  60 0.623 361 1.02
8. . . . . . . . 69 0.774 423 1.08
  70 0.796 423 1.11
9. . . . . . . . 79 0.867 359 1.42
  80 0.845 360 1.38
10. . . . . . . . 89 0.392 186 0.94
  90 0.298 186 1.09
    Av . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.08
LOCATION 3
7  . . . . . . . . 51 0.552 361 0.90
8  . . . . . . . . 61 0.837 424 1.16
9  . . . . . . . . 71 0.869 379 1.35
10. . . . . . . . 81 0.426 188 1.33
   Av . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.19
LOCATION 4
6. . . . . . . . 42 0.955 402 1.40
7. . . . . . . . 52 1.012 362 1.64
8. . . . . . . . 62 0.989 425 1.37
9. . . . . . . . 72 1.411 379 2.19
10. . . . . . . . 82 0.597 188 1.87
   Av . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.69

 
Table A-3.-Results of RAM-1 dust monitor at site 1 sample locations,
using normal system (without B&BCD)
(all bags were 45.4 kg)
Run Day Sample location
1 2 3 4
120 MESH
1 . . . . . . . . . . . 2 .099 1.11 0.90 1.07
2 . . . . . . . . . . . 2 1.00 0.90 1.23 1.30
3 . . . . . . . . . . . 2 1.42 1.39 1.18 1.23
4 . . . . . . . . . . . 5 0.95 0.87 0.90 1.21
5 . . . . . . . . . . . 5 0.73 0.67 0.71 1.00
   Av . . . . . . . . . . . . . . 1.02 0.99 0.98 1.16
180 MESH
1 . . . . . . . . . . . 1 1.40 0.69 1.35 0.98
2 . . . . . . . . . . . 2 1.49 1.59 1.18 1.51
3 . . . . . . . . . . . 5 1.75 2.05 1.41 1.97
   Av . . . . . . . . . . . . . . 1.55 1.44 1.31 1.49
200 MESH
1 . . . . . . . . . . . 2 2.76 2.53 2.13 2.28
2 . . . . . . . . . . . 3 1.63 2.02 1.85 1.99
3 . . . . . . . . . . . 3 1.30 1.65 2.48 1.27
4 . . . . . . . . . . . 4 1.53 1.65 1.38 1.88
   Av . . . . . . . . . . . . . . . 1.81 1.96 1.96 1.86
325 MESH
1 . . . . . . . . . . . 3 1.63 1.83 2.75 1.46
2 . . . . . . . . . . . 4 1.32 1.49 1.28 2.36
   Av . . . . . . . . . . . . . . . 1.48 1.66 2.02 1.91

 
Table A-4.-Plant 1: Vacuum testing of bags to determine reduction
in product on outside of bags
Run Bag size, Product size, Bag weight, g Dust weight, g
  kg mesh
 
      Before After  
NORMAL SYSTEM:  WITHOUT B&BCD
1 . . . . . . . . . . 45.4 200 36.5 72.9 36.4
2 . . . . . . . . . . 45.4 200 36.7 93.4 56.7
3 . . . . . . . . . . 45.4 200 36.8 81.5 44.4
4 . . . . . . . . . . 45.4 200 36.9 81.5 44.6
   Av . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45.5
1 . . . . . . . . . . 45.4 325 36.9 83.8 46.9
2 . . . . . . . . . . 45.4 325 37.3 91.5 54.2
   Av . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50.6
1 . . . . . . . . . . 22.7 200 37.0 305.9 268.9
2 . . . . . . . . . . 22.7 200 36.9 109.8 72.9
   Av . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170.9
WITH B&BCD
1 . . . . . . . . . . 45.4 200 37.4 48.1 10.7
2 . . . . . . . . . . 45.4 200 37.3 49.5 12.2
3 . . . . . . . . . . 45.4 200 37.7 54.2 16.5
4 . . . . . . . . . . 45.4 200 37.7 49.1 11.4
5 . . . . . . . . . . 45.4 200 36.7 42.2 5.5
6 . . . . . . . . . . 45.4 200 37.4 42.4 5.0
   Av . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.2
1 . . . . . . . . . . 45.4 325 37.7 48.0 10.3
2 . . . . . . . . . . 45.4 325 37.6 45.6 8.0
   Av . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.2
1 . . . . . . . . . . 22.7 200 37.6 52.7 15.1
2 . . . . . . . . . . 22.7 200 36.8 57.3 19.5
   Av . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17.3
1 . . . . . . . . . . 22.7 325 37.4 52.4 15.0
2 . . . . . . . . . . 22.7 325 37.7 48.5 10.8
3 . . . . . . . . . . 22.7 325 38.2 62.4 24.2
4 . . . . . . . . . . 22.7 325 37.8 55.5 17.7
   Av . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.9

 
Table A-5.-Site 2:  Results of RAM-1 dust monitor at sample locations
Sample location . . . . . . . . . . . . . . . 1 2 3 4
140 MESH, 45.4-kg BAGS
Run 1:        
   Without B&BCD, g  . . . . . . . . . . . . 0.25 0.69 NA 0.44
   With B&BCD, g . . . . . . . . . . . . . . . 5.65 0.17 NA 0.73
   Reduction, pct (2160.0) 75.4   (65.9)
Run 2:        
   Without B&BCD, g  . . . . . . . . . . . . 5.07 0.66 0.37 0.52
   With B&BCD, g . . . . . . . . . . . . . . . 9.60 0.50 0.64 0.54
   Reduction, pct (89.3) 24.2 (73.0) (3.8)
Run 3:        
   Without B&BCD, g  . . . . . . . . . . . . 2.08 0.56 0.56 0.53
   With B&BCD, g . . . . . . . . . . . . . . . 14.27 0.50 0.38 0.45
   Reduction, pct 586.1 10.7 32.1 15.1
Run 4:        
   Without B&BCD, g  . . . . . . . . . . . . 11.61 0.69 0.68 0.69
   With B&BCD, g . . . . . . . . . . . . . . . 17.45 0.73 0.40 0.63
   Reduction, pct (50.3) (5.8) 41.2 8.7
Run 5:        
   Without B&BCD, g  . . . . . . . . . . . . 7.77 0.91 0.34 0.60
   With B&BCD, g . . . . . . . . . . . . . . . 44.63 0.86 0.12 0.35
   Reduction, pct (474.4) 5.5 64.7 41.7
140 MESH, 45.4-kg BAGS1
Run 1:        
   Without B&BCD, g  . . . . . . . . . . . . 6.63 0.67 0.71 0.67
   With B&BCD, g . . . . . . . . . . . . . . . 14.27 0.50 0.66 0.61
   Reduction, pct (204.2) 25.4 7.0 9.0
200 MESH, 22.7-kg BAGS
Run 1:        
   Without B&BCD, g  . . . . . . . . . . . . 0.25 0.88 0.29 0.45
   With B&BCD, g . . . . . . . . . . . . . . . 0.70 0.54 0.12 0.37
   Reduction, pct (180.0) 38.6 58.6 17.8
325 MESH, 22.7-kg BAGS
Run 1:        
   Without B&BCD, g  . . . . . . . . . . . . 7.28 1.03 0.43 0.62
   With B&BCD, g . . . . . . . . . . . . . . . 64.10 0.51 0.54 0.68
   Reduction, pct (780.5) 50.1 (25.6) (9.7)
Run 2:        
   Without B&BCD, g  . . . . . . . . . . . . 7.47 0.89 0.14 0.31
   With B&BCD, g . . . . . . . . . . . . . . . 42.86 0,.38 0.15 0.25
   Reduction, pct (1017.4) 53.9 (16.4) 4.9
NA   Not Available; dust monitor malfunctioned.      
1Full poly liners        
NOTE.-Number in parentheses are negative      
 
 
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