Ball mill introduction

 

Grinder type:  ball Mill

Application area:  mineral ore dressing plants and other grinding industry.

Grinding material:  cement, the silicate product, new type building material, fire-proof material, black and non-ferrous metal, ceramics and etc.

Capacity:  0.65-450t/h (can be customized)

Final size (mm): 0.8-0.075(can be customized)

Max. Feeding Size(mm):  25(can be customized)

Ball mill features

Suitable for grinding material with high hardness

the shape of the final products is circular

No pollution for the powder with ceramic ball

Stable performance Easy installation

the capacity and fineness can be adjusted by adjusting the diameter of the ball.

Ball mill working principle

 

When the ball mill works, motor and speed reducer transmit torque force to big and small gears of ball mill, so the barrel rotates.

When the barrel rotates, Steel balls or other grinding media in the barrel are lifted to a certain height and fall down freely, so materials in the barrel are impacted.

Grinding media mixing with materials impact and grind materials continuously. the grinding media and materials impact and grind each other when the ball mill rotates continuously.

the final product will be discharged from outlet when it meets the request, so the grinding process is finished.

 

A ball mill grinds ores and other materials to a typical product size of 35 mesh or finer.

the feed to a ball mill is prepared by...
· Single or multistage crushing and screening
· Crushing, screening, and/or rod milling
· Primary crushing and autogenous/semiautogenous grinding

Mine Ball Mill Normal feed sizes:
· 80% passing 1/4" (6 mm or finer) for hard ores
· 80% passing 1" (25 mm or finer) for softer ores
(Larger feed sizes can be tolerated depending
the length to diameter ratio of cylindrical mills range from 1 to 1 through 3 to 1. When the L/D ratio is 2 to 1 or greater, werefer to the mill as a Tube Mill.
the two most popular types of ball mills are…

in the discharge end of this mill, a slotted full diameter or partial diameter grate with discharge lifter assembly conveys the material to the discharge trunnion opening. the grate serves to retain balls, tramp, and coarse material. A gradient created between the feed opening and the discharge slots eases the flow of material.
Trunnion Overflow Discharge Ball mill
A trunnion overflow mill has an open discharge end. Material flows through the trunnion as a result of the pulp gradient between the feed and discharge openings. A reverse helix in the discharge trunnion liner retains balls in the mill.
CITIC Ball Mill Feature
?the cylindrical mill adopts the driving type edge-driving, center-driving, edge-driving with multi-point meshing, etc; driven by asynchronous motor +reducer +pinion and gear as well as synchronous motor +

Air l\clutch + pinion and gear.
?Generally supported by static-dynamic pressure bearing on both ends. Fuuly closed self-aligning 120o osculation rocker bearing is used. Also single or double slipper staic- dynamic bearings can be used. the bush is made by NC machine.
? the large open gear is designed using AGMA standard, Equipped with reliably sealed gear housing and grease ahtomatic spraying lubrication system.
 the shell is key part of a mill. Carry out finite element analysis on it with computer to ensure the reliable operation;
? the shell is automatically welded, ultrasonic inspected, wholly annealed and machined by large special machine tools on one chucking; there special seal on static-dynamic connection parts, ch as feed and discharge hoper, trunnion, etc, to prevent oil and slurry leakage;
? the liner is of wear-resistance material mad by our company, wich has been specially heat-treated, with high hardness and long service life. Also other wear-resistance casting or rubber liner can be used;
? There are slow speed drive for medium and large mill;
?the high and low pressure lubricating station is equipped for medium and large mill;
?the control and protection system is controlled by PLC.