Ball type of ball mill and ball raw material
Date：2015-01-26 03:12:52 ?? Source：Clirik
Currently
ball mill is widely used domestic and abroad, and most of ball mill use high-carbon alloys and high carbon low-alloy casting ball class forging ball (or cast grinding balls).In thermal power plants, cement industry and other dry production process, the vast most use high and low chrome cast iron ball. The wet process mining applications prefer multi-class high-carbon low-alloy ball.
There are many types of
ball mill. Due to defects in the market, the ball mill choice is not decided by the use of ball-effective process. The main varieties
ball mill ball material is high-alloy chromium cast iron. Such as: Cr8, Cr12, Cr15, Cr18, Cr24, Cr26, etc., low chromium cast iron such as: Cr2 and martensitic ductile iron category. Martensitic chromium cast iron ductile iron and low abrasion on the same level in terms of their differences in the production process. The class of high-alloy cast iron with excellent wear resistance, the higher the alloy, the better anti-wear properties, but also has good economic benefits. Someone had misunderstood, high chrome ball cement mill applications is good, but not suited to the power plant, in fact, the country has a large thermal power plants use a good record high chrome ball. After the plant using high chrome ball and no longer want to use the other balls, high chrome cast iron ball in the rapidly growing popularity of the plant. In power plants, cement plants and other dry mill process only 15 to 50 grams high chrome ball wear for producing one tone products. The use of high chrome ball not only save the cost, reduces labor, reduce electrical energy consumption for grinding, but also reduces the waste of resources. From the above, high chrome ball can be called green ball and effiency ball.
Forging and rolling
ball ball varieties of high-carbon-chromium-molybdenum alloys and in low-carbon manganese alloys. Forging and rolling ball ball process is simple, low cost, considering the current economic mining class, wet process generally use low-chromium alloy ball, the wear is generally 500 to 700 g in iron ore, copper, molybdenum ore. Improve low-chromium alloy ball hardness is the most effective way to reduce wear. We used to have a low chrome ball hardness increased to about HRC55, the wear on copper is around 550 grams. Due to the production process, the quality of forging ball rolling ball should be slightly better than some.
The choose of ball mill ball
If the diameter is greater than 110mm, we recommend using a low-carbon-chromium-molybdenum alloy forging ball, mainly on account of the large diameter cast ball crushing rate may have higher crushing efficiency. Forged ball generally has 1% carbon content, the chromium content less than 2%. Low chromium cast ball hardness generally should be about HRC48, should be possible to increase the hardness of low chromium cast iron ball in order to improve economic efficiency. The low chromium cast iron ball hardness should up to HRC55, and the heart and surface hardness should have small difference. Ball diameter of thermal power plants is generally not more than vertebral 60mm. Cement and mining should be graded on the basis of the ball diameter mill diameter, surface shape and lining feed size. Grading only has one principle: to minimize the diameter of ball.
Ball mill is grinding machine, if relying on the ball to take crushing effect, even only a small part that is very inappropriate.
Under the premise of the raw material selected,
ball mill grading is very important. Ideal balls plus graded ideal shape make the mill liner surface for maximum efficiency. The correct choice of raw material ensures the ideal ball graded and ideal surface shape of the liner in best state.
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