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ball mill steel ball

2016-02-26

Ball is the material being broken, and then smash the key equipment.
The ball mill is one of the fine grinding machinery widely used in industrial production.
The species has a lot of, such as horizontal ball mill, ball mill liner, energy-saving ball mill, the overflow type ball mill, ceramic ball mill, grid ball mill.
Ball mill for grinding various ores and other materials are widely used in mineral processing, building materials and chemical industry, can be divided into two kinds of dry and wet grinding method. According to different ways of discharge, can be divided into two kinds of lattice type and overflow.
requirement
Effect of ball mill output is not only influenced by steel ball loading, and diameter of the steel ball. Is required to maintain a certain proportion between the ball diameter and different diameter ball, general cylinder ball diameter size in the range of 25 - 60mm. If the cylinder is large diameter of the ball, the impact force is larger, the break bulk coal favorable, but due to the large gap between the ball and the ball, relative surface area is small, the extrusion and grinding action of weakening, of coal mill output and fineness of pulverized coal were negative. The cylinder of small diameter steel ball too much, small impact force, enable the mill output decreased, at the same time, due to the steel ball surface area is relatively large, so the steel ball wear increases, grinding of coal consumption increased.
As the coal mill in operation, due to wear, ball weight and diameter are constantly reduced, therefore need to regularly fill into the new ball, in order to maintain a certain amount of steel ball loading. Generally add to the large diameter ball, the ball feeding amount should be based on the wear rate of steel balls (wear amount per mill a ton of coal ball mill and coal) to determine the amount. Some time after the operation of coal grinding machine, the number of small diameter steel tube increased. It is usually in about 3000 hours after the operation, need to stop cleaning ball, to remove less than 15mm in diameter ball and broken ball, and at the same time to make up a new ball.
Method of use
New installation of ball mill has a running in process, in the process of running, ball quantity first add, accounted for 80% of the ball mill is the largest ball charge, add the ball ratio can be added according to the size of ball size (diameter of 120 mm, diameter 100 mm, Phi 80 mm, Phi 60 mm, diameter 40 mm). Different types of the different load of ball mill. For example, MQG1500 * 3000 largest ball mill ball charge 9.5 to 10 tons. First add ball ball (120 mm and 100 mm) accounted for 30% - 40%, the ball 80 mm accounted for 40% - 30%, the ball (60 and 40) accounted for 30%.
Why in the running in process of ball mill ball add only 80%, because after installation of ball mill, ball mill gear and pinion requires meshing, handling capacity is to be gradually increased, ball mill to be normal continuous operation in a couple of days, pick up the check size gear meshing, until all normal, open the ball mill manhole cover the second add the remaining 20% steel ball.
Note: small ball to add just the first ball with. Because, when the normal operation of the ball and the ball mill, ball and ore, steel ball and ball mill lining plate between the reasonable friction, will wear increases, make small, milling ball milling. So normally, do not need to add the ball. Ball is no monomer dissociation in valuable minerals size. When the grinding fineness of mill is not up to the requirements of floatation, adding the right amount of ball. The ball mill is worn during operation, in order to maintain a reasonable ratio of ball charge and ball filling rate, stable operation of the ball mill, it is necessary to make reasonable relief, low wear.
Add the ball weight is according to the quality of the steel balls, steel ball quality is good or bad, tons of ore consumption dosage, the best use of new wear-resistant steel ball, such as the use of the train wheel by special processing forging and into the ball on the special wear-resistant.

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