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The sizing of ball mills and ball milling circuits from laboratory grinding tests is largely a question of applying empirical equations or factors based on accumulated experience. Different manufacturers use different methods and it is difficult to check the validity of the sizing estimates when estimates from different sources are widely divergent. It is especially difficult to teach mill

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The Time that the ore spends in the grinding mill is called RETENTION TIME. This is a very important variable the longer the retention time the more the ore comes in contact with the rods the better and finer the grind becomes. To understand this important control it must be remembered that any volume that is added to a circuit must leave the circuit at exactly the same rate. All the

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Mar 10 2011 · This is the raw mill not the finish mill. So Wi should be 11 and density of 2.67 as normal kiln feed. I used d80 of 3500 micron to be on safe side and got max ball

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where d b.max is the maximum size of feed (mm) σ is compression strength (MPa) E is modulus of elasticity (MPa) ρb is density of material of balls (kg/m 3) D is inner diameter of the mill body (m).. Generally a maximum allowed ball size is situated in the range from D /18 to D/24.. The degree of filling the mill with balls also influences productivity of the mill and milling efficiency.

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Optimization of mill performance by using online ball and pulp measurements by B. Clermont and B. de Haas Synopsis Ball mills are usually the largest consumers of energy within a mineral concentrator. Comminution is responsible for 50 of the total mineral processing cost. In today s global markets expanding mining groups are trying

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The pulp weight in the mill is obtained by subtracting the mill weight during the test from the empty mill weight including the ball charge at the start of the test. The pulp volume of the pulp in the mill is then calculated using the mill discharge density (before dilution) obtained during the sampling.

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where d b.max is the maximum size of feed (mm) σ is compression strength (MPa) E is modulus of elasticity (MPa) ρb is density of material of balls (kg/m 3) D is inner diameter of the mill body (m).. Generally a maximum allowed ball size is situated in the range from D /18 to D/24.. The degree of filling the mill with balls also influences productivity of the mill and milling efficiency.

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Bond developed an express ion to quantify mill shaft power based on data from a number of laboratory and industrial ball mills P↓S = 7.33J↓B Φ↓c (1-0.937J↓B)ρ↓b LD↑2.3 (1-0.1 / 2↑910Φ↓C) ρ S = Mill power. D = Mill diameter in meters. L = Mill length in meters. ρ B = Ball density in t/m 3

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The basic parameters used in ball mill design (power calculations) rod mill or any tumbling mill sizing are material to be ground characteristics Bond Work Index bulk density specific density desired mill tonnage capacity DTPH operating solids or pulp density feed size as F80 and maximum chunk size product size as P80 and maximum and finally the type of circuit open/closed

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