Relevant introduction of foreign coarse ball mill ball size

Coarse grinding ball mill is a kind of equipment for grinding machinery. The development of foreign ball mill is earlier than domestic. The ball material of ball mill is also not the same in China. In order to let users better understand the development process of rough grinding ball mill, we Let's take a look at the current situation of coarse ball mills abroad.

Foreign coarse ball mill ball size status

The rough grinding machines for metal ores mainly include rod mills, ball mills, and self-grinding and semi-autogenous grinding. The grinding media used include steel rods, steel ball gravels and the like. Because the steel rods are in line contact with each other, they have a selective crushing effect, but because they have a smaller specific surface area than balls, they are suitable for coarse grinding media. In Europe and America, coarse grinding equipment uses a lot of rod mills. Needless to say, tungsten and tin and other brittle and fragile minerals are also used. The coarse grinding of non-ferrous metal ores is also mostly done by rod grinding. The grinding statistics for 17 copper and copper-molybdenum mines in Canada, 6 copper-nickel mines and 23 copper-lead-zinc mines show that the coarse grinding of 33 mines is based on rod grinding, and the rough grinding is performed by self-grinding or semi-auto grinding. The mine has three or four mines with kibble grinding and rod grinding in the kiln; only six kiln roughing machines are finished by ball milling, especially for rough grinding of copper, lead, zinc and other polymetallic ore, so as to effectively avoid Due to the metal loss caused by the comminution, rod mills are used for rough grinding. Canada's iron ore grinding is mostly solved by rod grinding or self-grinding and semi-auto grinding. Ball milling is hardly seen.

In coarse grinding mills, the diameter of the ball is an important factor influencing the particle size distribution and grinding effect of the grinding product. Table 19 lists the large ball diameters of the rough grinding ball mills in some foreign concentrators. It can be seen from the teachings in the table that the large diameter of foreign metal ore grinding does not exceed iOOmm, and some dressing factories make up the ball with a diameter of only 75m. Most dressing factories only add a small amount of large balls for crushing And difficult to grind particles, and a large number of small ball balls. Such as the Eagle Bridge Concentrator in addition to the additional ball diameter of 100mm ball, but also to add the ball diameter of 64mm (2 5in) and 38mm (1. 5in) ball Aisal concentrator plant a large number of additional ball diameter of 75mm (3in ) Steel ball, the additional ball diameter of 100mm ball only accounts for about 20% of the ball weight of 75mm ball diameter, which determines the average particle size of the ball load in the mill is 75-80mm. This result makes the coarse grinding ore, based on sufficient crushing force, fully consider the effect of smaller Ding diameter on the ball, the increased probability of crushing caused by the increase in the number of balls, and avoiding excessively large diameters. Excessive crushing caused by the increase of crushing force will increase the damage to the grinding ore and make the grinding efficiency of the coarse grinding more efficient. Product particle size distribution is more reasonable.

The above is the current situation of foreign coarse ball mill ball size introduced by the engineers of Zhengzhou Hongxing Machinery Manufacturing Co., Ltd. and hopes to help users who are purchasing ball mills. The crusher and ball mill manufacturers of Zhengzhou Hongxing Machinery specialize in the sale of ball mills. hotline.

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