Feinmahlung von Magnetit-Erzen in einer Ruhrwerkskugelmühle : [Fine grinding of a magnetite ore with a stirred ball mill]

• There has been a growing need in recent years to develop a more energy efficient grinding process. Fine grinding experiments have been conducted with a stirred ball mill (SAM-Sala Agitated Mill). The stirring is achieved by the rotation of a single vertical rotor equipped with protruding pins, which are made of solid tungsten carbide. Grinding media size (cylpebs), pulp density, rotor speed, media level and energy input have been identified as the most important parameters affecting fine grinding. The present paper discusses the influence of these parameters on fine grinding of a magnetite ore. The results show that for a given set of conditions (pulp density, energy input and rotor speed) qq 3mm balls are approximately 30% more efficient than 8mm qq cylpebs. There exists a particular combination of pulp density, grinding media level and rotor speed which optimises the grinding performance. Comparison of the stirred ball mill has been made with a conventional ball mill at the same energy input per ton of material and at three pulp densities. The comparison was made at optimum performance of both mills. 30-40% better fine grinding performance were obtained with the stirred ball mill.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Metallurgi och metalliska material (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Metallurgy and Metallic Materials (hsv//eng)

Nyckelord

Mineral Processing

Mineralteknik

Publikations- och innehållstyp

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