Output size 10 350mm Ball mill is a type of grinder machine which uses steel ball as grinding medium, can crush and grind the materials to 35 mesh or finer, adopted in open or close circuit. The feed materials can be dry or wet, they are broken by the force of impact and attrition that created by the different sized balls.
Ball Mills Ball mills have been the primary piece of machinery in traditional hard rock grinding circuits for 100+ years. They are proven workhorses, with discharge mesh sizes from 40M to lt;200M. Use of a ball mill is the best choice when long term, stationary milling is justified by an operation.
The rods grind the ore by tumbling within the mill, similar to the grinding balls in a ball mill. To prevent the conditions leading to rod charge tangling, the length to diameter ratio is maintained at 1.4 to 1.6. Rod mills accept feed up to about 50 mm and produce a product in the size range of 3000 to 270 mm . Grinding action is by line contact between the rods extending the length of the mill.
It is generally accepted that in the case of a given ore the amount of grinding which can be accomplished through a particular mesh by a ball or rod mill is dependent upon two factors: The size of the grinding media. The net power input to the mill.
In some plants a ball mill or rod mill will reduce the ore to, say, 100 mesh and a tube mill will finish the grinding to 200 mesh or finer. In other plants a ball mill or a tube mill will do all the grinding, but it must be fed with fine oresay, 1/8 to ¼ inchto do this properly.
but for AG/SAG mill analyses the standard 14 mesh sieve is typically used. The rod mill work index is computed with an equation very similar to that of the ball mill test, as follows: It is common to observe a difference between the rod mill and ball mill values for a given ore type. These differences may be caused by a variation in ore
Ore ball mill can produce powder from various non flammable and non explosive mineral materials with Mohs hardness below 9.3 and humidity below 6%, such as barite, limestone, kaolnite, ceram and slags, etc. The Product size is adjustable in the range of 80 425 mesh. Ore ball mill is possible to produce 30 80 mesh coarse powder through special device in the machine if necessary.
The ball mill is in closed circuit with a sump and three cyclone classifiers. The ore and trim water are added to the ball mill and the outflow from the ball mill goes to a sump where additional water is added.
With more than 100 years of experience in ball mill technology, Outotec ball mills are designed for long life and minimum maintenance. They grind ores and other materials typically to 35 mesh or finer in a variety of applications, both in open or closed circuits.
June 10, 2020
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