Photographs of a glass ended laboratory ball mill show action of ball mass within the mill The action of other grinding media is similar.
As the mill revolves lifters assist in picking up the grinding charge and elevate it to an angle at which gravity overcomes friction and centrifugal force The charge then cascades downward effectively grinding particles of material within the mill by continuous repeated impact and attrition action.
Grinding mills reduce particle size by impact rolling and sliding Of the many types in use the cylindrical mill which employs a cascading mass of balls or rods is universally used for the size reduction of hard moderate to highly abrasive materials such as minerals ores stone and chemicals.
A cylindrical mill when operating under uniform conditions will produce a uniform product Wear on grinding surfaces has little effect on capacity or product size Very little maintenance is required with these mills downtime being a negligible factor in their operation For continuity of operation the cylindrical mill has no equal.
Grinding mills of this type will give you dependable trouble free operation year after year with 8220planned periods of stoppage for renewal of parts Initial cost is distributed over a long operating period Many grinding mills are still in service after more than 40 years of almost continuous operation Ton for ton of material handled the cylindrical type mill has proved to be the most economical investment for reducing moderate to extremely abrasive materials.
911Metallurgist sourcesmanufacturers of all the proven mill designs in a 8220small8221 range of sizes your assurance of getting the most suitable mill for your purpose Best grinding efficiency and economy can be obtained only when the type and size of your mill is matched with your grinding job Mills can also be furnished with modifications to suit any special application.
The choice between wet or dry grinding is dependent upon the use of the product or the subsequent process It is imperative to dry grind many materials because of physical or chemical changes which occur if water or a solution are added Wet grinding with water or with a concentrated solution of the soluble salts being ground is generally preferred because of the overall economies of this operation.
Rod mills in iron ore concentrating plant Rod mills bridge the gap between crushing and grinding are often used for preliminary grinding ahead of ball mills.
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