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Grate Ball Mill Capacities
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Mill Size (I.D. Shell x Grinding Length) Feed
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Feed
** Grind
*% 200 Mesh
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1 ¼”
20 Mesh
35-40
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¾”
35 Mesh
45-55
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½”
48 Mesh
55-65
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½”
65 Mesh
65-75
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3/8”
80 Mesh
75-82
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3/8”
100 Mesh
82-88
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¼”
150 Mesh
88-95
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¼”
200 Mesh
95-98
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5 ½ x 4
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142
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118
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100
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80
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61
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50
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40
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31
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6 ½ x 6
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215
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176
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151
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120
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92
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75
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60
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47
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6 ½ x 5
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310
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255
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215
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175
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138
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108
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88
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67
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7 ½ x 7
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435
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355
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305
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245
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194
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151
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123
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94
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7 ½ x 5
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480
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400
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340
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270
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215
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172
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138
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108
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8 ½ x 7
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670
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560
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470
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380
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300
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240
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193
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150
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8 ½ x 6
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880
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730
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620
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500
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385
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305
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250
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193
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8 ½ x 8
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1,180
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970
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830
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670
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520
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410
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330
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260
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9 ½ x 7
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1,430
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1,190
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1,010
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820
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640
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510
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410
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325
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9 ½ x 9
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1,840
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1,540
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1,300
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1,060
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820
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650
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530
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420
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10 ½ x 10
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2,770
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2,300
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1,970
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1,600
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1,240
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980
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780
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620
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10 ½ x 14
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3,740
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3,100
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2,650
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2,160
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1,680
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1,330
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1,080
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830
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11 ½ x 12
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4,410
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3,630
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3,140
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2,500
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1,950
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1,560
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1,260
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970
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11 ½ x 14
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5,020
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4,130
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3,570
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2,850
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2,220
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1,770
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1,430
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1,100
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12 ½ x 12
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5,580
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4,670
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4,010
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3,220
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2,510
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1,990
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1,610
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1,250
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12 ½ x 14
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6,430
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4,620
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4,620
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3,710
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2,900
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2,290
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1,860
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1,440
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** Grind is nominal mesh size indicated, + 2% - 5%
* Range of -200 mesh in product for grind indicated.
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The above capacity tables list the most common Marcy ball mill sized. Capacities are based on medium hard ore with mill operating in closed circuit under wet grinding conditions. To construct these tables. Mine and Smelter first gathered comparative data from operations of overflow and grate mills of the same size. From analysis of this data, the empirical relation used for these tables was derived. For dry grinding, speeds are reduced and capacities dropped between 30% to 50%.
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