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1.ISO9001:2008, 2.professional manufacture with 50years, 3.durable liner,whole life service,discharging evenly, 4.customized - details see: https://www.machineto.com/2200-7000-mining-machine-ball-mill-with-iso-in-china-for-fine-grinding-10310923

What Are These Machines and How Do They Work?

A Ball Mill grinds material by rotating a cylinder with steel grinding balls, causing the balls to fall back into the cylinder and onto the material to be ground. The rotation is usually between 4 to 20 revolutions per minute, depending upon the diameter of the mill. The larger the diameter, the slower the rotation. If the peripheral speed of the mill is too great, it begins to act like a centrifuge and the balls do not fall back, but stay on the perimeter of the mill.

The point where the mill becomes a centrifuge is called the "Critical Speed", and ball mills usually operate at 65% to 75% of the critical speed.

Ball Mills are generally used to grind material 1/4 inch and finer, down to the particle size of 20 to 75 microns. To achieve a reasonable efficiency with ball mills, they must be operated in a closed system, with oversize material continuously being recalculated back into the mill to be reduced. Various classifiers, such as screens, spiral classifiers, cyclones and air classifiers are used for classifying the discharge from ball mills.

This formula calculates the critical speed of any ball mill. Most ball mills operate most efficiently between 65% and 75% of their critical speed.

Types:

Mill could be sorted as following:

As per the grinding media: ball mill, rod mill and AG Mill (without grinding media).

As per material discharging mode: wet grid mill, dry grid mill & overflow mill.

As per driving mode: side & central driving. The former is more popular now.

As per driving configuration:

a. Asynchronous motor driving: Asynchronous motor + Reducer + Pinion +Girth gear

b. Synchronous motor driving: Synchronous motor+ Air clutch+ Pinion +Girth gear

c. Asynchronous motor + reducer + diaphragm coupling

Structure of Ball mill:

The machine is composed of feeding part, discharging part, turning part and driving part (reducer, small driving

gear, electric motor and electric control).

The quill shaft adopts cast steel part and the liner is detachable. The turning gearwheel adopts casting hobbing process and the drum is equipped with wear-resistant liner, which has good wear-resistance.

Model	Rotation speed of shell(r/min)	Ball load(t)	Feeding size(mm)	Discharging size(mm)	Capacity(t/h)	Motor power(KW)
Φ900×3000	36	2.7	≤20	0.075-0.89	1.1-3.5	6.8
Φ1200×2400	36	3	≤25	0.075-0.6	1.5-4.8	12
Φ1200×3000	36	3.5	≤25	0.074-0.4	1.6-5	13.2
Φ1500×4500	27	11	≤25	0.074-0.4	3-6	21
Φ1500×5700	28	12	≤25	0.074-0.4	3.5-6	24.7
Φ1830×3000	25.4	11	≤25	0.074-0.4	4-10	34.5
Φ1830×6400	24.1	21	≤25	0.074-0.4	6.5-15	46
Φ1830×7000	24.1	23	≤25	0.074-0.4	7.5-17	49
Φ2100×4500	23.7	24	≤25	0.074-0.4	8-43	59
Φ2100×7000	23.7	26	≤25	0.074-0.4	8-48	67.5
Φ2200×4500	21.5	27	≤25	0.074-0.4	9-45	58
Φ2200×6500	21.7	35	≤25	0.074-0.4	14-26	63
Φ2200×7500	21.7	35	≤25	0.074-0.4	15-30	66.5
Φ2400×3000	21	23	≤25	0.074-0.4	7-50	65
Φ2400×4500	21	30	≤25	0.074-0.4	8.5-60	70
Φ2700×4000	20.7	40	≤25	0.074-0.4	12-80	92
Φ3200×4500	18	65	≤25	0.074-0.4	Determined by the technological process	137
Φ3600×4500	17	90	≤25	0.074-0.4	Determined by the technological process	158
Φ3600×6000	17	110	≤25	0.074-0.4	Determined by the technological process

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