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Rod 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”
8 Mesh
20-30
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1”
20 Mesh
30-42
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1”
35 Mesh
42-55
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1”
48 Mesh
55-65
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1”
65 Mesh
65-75
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5 ½ x 10
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590
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440
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350
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290
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220
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5 ½ x 12
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710
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530
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420
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350
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260
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6 ½ x 12
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1,080
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820
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650
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540
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400
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6 ½ x 14
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1,260
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950
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760
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630
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470
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7 ½ x 12
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1,650
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1,240
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990
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820
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620
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7 ½ x 14
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1,930
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1,450
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1,160
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960
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720
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8 ½ x 12
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2,290
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1,700
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1,370
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1,140
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850
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8 ½ x 15
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2,860
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2,130
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1,710
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1,430
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1,070
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9 ½ x 12
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3,080
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2,310
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1,850
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1,530
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1,150
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9 ½ x 15
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3,850
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2,890
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2,310
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1,920
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1,440
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10 ½ x 14
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4,600
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3,460
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2,760
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2,290
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1,710
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10 ½ x 16
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5,260
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3,950
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3,160
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2,620
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1,960
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11 ½ x 16
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6,800
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5,090
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4,080
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3,390
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2,540
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11 ½ x 18
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7,650
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5,730
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4,590
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3,810
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2,860
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12 ½ x 16
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8,510
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6,420
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5,110
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4,240
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3,180
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12 ½ x 18
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9,580
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7,220
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5,750
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4,770
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3,580
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13 ½ x 18
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11,600
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8,720
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6,950
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5,770
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4,320
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13 ½ x 20
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12,900
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9,700
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7,730
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6,410
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4,810
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14 x 18
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12,600
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9,480
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7,550
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6,260
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4,700
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14 x 20
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14,000
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10,500
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8,390
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6,960
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5,220
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14 ½ x 18
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13,700
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10,300
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8,220
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6,820
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5,110
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14 ½ x 20
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15,200
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11,500
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9,140
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7,580
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5,680
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** Grind is nominal mesh indicate 2 – 5%
* Range of – 200 mesh in product for grind indicated.
The above capacity tables list the most common Marcy rod mill sizes. Capacities are based on medium hard ore with mill operating in open circuit under wet grinding conditions. To construct these tables, Mine and Smelter first gathered comparative data from operations of open-end rod mills of the same size. From analysis of this ata, the empirical used for these tables was derived. For dry grinding, speeds are reduced and capacities dropped between 30% to 50%.
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