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Iron Ball Mill: Grüson Drum with a Stepped Die Ring and Two Screens (Richards, 1903)
The Grüson ball mill: a drum turning on a horizontal axis, charged with chilled iron or steel balls of mixed sizes. The balls grind the ore against each other and against a stepped die ring. The ground ore passes out through a coarse and a fine screen; the oversize is carried back in.
Result: a mill for fine grinding of cement, fertiliser, clay and soft ores, wet or dry. Sizes from 0.66 m to 1.83 m across.
Source: R. H. Richards, Ore Dressing, vol. I (1903), § 225, Figs. 172a-b and Table 149. Unknown: dimensions beyond the table, and the materials of the side plates, screens and shaft. Picture: Richards, Figs. 172a-b.
Avanzato
Unknown
Istruzioni
1
1
Make the drum and the die ring
Make the drum and the die ring
The drum is two side plates (b) joined round the edge by the die ring (a). The die ring is five perforated, spiral plates of chilled iron. Each plate laps the next, so they form steps: the balls drop from one step to the next, and the space under each step lets the oversize from the screens back in. Not given: the side-plate material, sizes, hole sizes.
Materiali per questo passaggio:
Getti di ghisa5 die plates, chilled iron
Materiale sconosciuto2 side platesStrumenti necessari:
Dimensioni sconosciute
Chiave regolabile a rullino2
2
Put the two screens round it
Put the two screens round it
Outside the die ring, fit a coarse perforated screen (c) to take the wear. It is in five parts with spaces between them and has back-deflecting holes (g). Outside that, fit a fine gauze screen (d). At the end of each section of fine screen, fix a deflector or shovel (f). As the drum turns, it carries the oversize up and back into the grinding space. Not given: the screens' metal and mesh.
Materiali per questo passaggio:
Lamiera forata da vaglio1 coarse screen, 5 parts
Tela metallica per vaglio1 fine screenMateriale sconosciuto5 deflectorsStrumenti necessari:
Dimensioni sconosciuteChiave regolabile a rullino3
3
Mount and house it
Mount and house it
Carry the drum on a horizontal shaft in two bearings; the figures show them on masonry piers. Enclose the drum in a plate iron housing with a discharge spout (e) below, a feed hopper (h) at one end, a manhole (i) and a dust pipe (k) on top. Ours: steel sheet for the plate iron.
Materiali per questo passaggio:
Albero in acciaio1 mill shaft
Supporto per cuscinetto2 pezzi
Lamiera di acciaio dolce1 housing, spout, hopperStrumenti necessari:
Chiave regolabile a rullinoDimensioni sconosciute4
4
Fit the drive
Fit the drive
Drive the mill by gear and pinion. In the figure, the gear is on the mill shaft and the pinion on a countershaft that carries tight and loose pulleys. A belt from the line shaft runs on the pulleys: on the tight pulley the mill turns, on the loose pulley it stops.
Materiali per questo passaggio:
Ruota dentata condotta1 on the mill shaft
Pignone dentato1 pezzoAlbero in acciaio1 countershaftSupporto per cuscinetto2 pezzi
Pulegge fissa e folle1 pezzoStrumenti necessari:
Cinghia di trasmissioneChiave regolabile a rullino5
5
Charge the balls (size sets the charge)
Charge the balls (size sets the charge)
Load chilled iron or steel balls in mixed sizes; mixed sizes grind better than one size. Size is the variable: No. 0 (0.660 m drum, 45 rev/min) takes 15 kg of 40 mm and 45 kg of 80 mm balls, 60 kg in all. No. 2 (1.330 m, 30 rev/min) takes 100 kg each of 100, 115 and 125 mm, 300 kg. No. 4 (1.830 m, 25 rev/min) takes 217 kg each of the same three sizes, 650 kg. The bigger the drum, the slower it turns and the heavier its charge.
Materiali per questo passaggio:
Corpi macinanti (sfere d'acciaio)300 kg for No. 2; 60 kg No. 0, 650 kg No. 4Strumenti necessari:
Bilancia industriale a piattaforma6
6
Grind
Grind
Feed the ore, egg-size, through the hopper and run the mill wet or dry. Power, and output per 24 hours: No. 0 takes 1/4 horse power and grinds 1,680 kg of copper ore to 15 mesh, or 840 kg of chrome iron ore to 130 mesh. No. 2 takes 2 1/2 to 3 horse power: 14,400 kg of brick bats to 20 mesh, or 1,920 kg of emery to 200 mesh. No. 4 takes 9 to 11 horse power: 12,720 kg of gold ores to 40 mesh, or 10,800 kg of chrome iron ore to 130 mesh. Wear: 1,345 kg of balls for 102,400 barrels of cement, about 0.139 lb a ton. The end plates last 18 months. Hard quartz ores wear the balls too much.
Strumenti necessari:
Cinghia di trasmissione
AcquaMateriali
11- 5 die plates, chilled ironSegnaposto
- 5 deflectorsSegnaposto
- 1 coarse screen, 5 partsSegnaposto
- 1 fine screenSegnaposto
- 1 countershaftSegnaposto
- 2 pezziSegnaposto
- 1 housing, spout, hopperSegnaposto
- 1 on the mill shaftSegnaposto
- 1 pezzoSegnaposto
- 1 pezzoSegnaposto
- 300 kg for No. 2; 60 kg No. 0, 650 kg No. 4Segnaposto
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