# Will The Grinding Medium of The Ball Mill Affect The Grinding Efficiency?

In a concentrator, grinding is an important factor affecting the economic indicators of the production process and operating efficiency. The impact of the grinding medium on the grinding efficiency and product quality is obvious, and it is easy to adjust. The following lists the influence of ball mill grinding medium on grinding efficiency from three aspects: medium filling rate, medium material, medium size, and ratio.

## 1. Medium filling rate of ball mill

The medium filling rate refers to the ratio of the volume of the medium added to the mill to the volume of the inner chamber of the ball mill, which determines the strength of the grinding effect. The more balls are loaded, the more blows, the larger the grinding area, the stronger the grinding effect, and the higher the productivity, but the power consumption is also high.

## 2. Medium material of ball mill

Ball mills consume a large amount of grinding media, and it is of great economic significance to improve wear resistance and prolong media life. At present, the materials of grinding media are mainly metal materials, including steel media, alloy steel media, cast iron media, etc. Subdivided into low-chromium cast balls (0.5-2.5% chromium, 1.8%-3.2% carbon), medium chromium cast balls (3%-7% chromium, 1.8%-3.2% carbon), high Chromium cast balls (containing more than 10% chromium and 1.8%-3.2% carbon), forged balls, hot-rolled steel balls, etc.

## 3. Media size and the ratio of ball mill

Ore grinding is mainly achieved by the impact crushing force generated when the steel ball is dropped and the relative sliding of the steel ball to the ore. The impact crushing force, grinding capacity, and processing capacity have a certain relationship with the size of the steel ball. Under the same amount, the size of the steel ball is proportional to the impact crushing force, grinding and crushing capacity, and processing capacity generated by the falling of the steel ball, and is inversely proportional to the single energy consumption of the steel ball and the grinding fineness within a certain range. If the steel ball is too large, the grinding particle size may not be achieved.

Therefore, when the grinding ore has a large hardness, a large particle size, and a large grinding particle size, the size of the steel ball should be appropriately increased, which has a significant effect on increasing production, saving energy , and reducing consumption. In production practice, the grinding media used in ball mills are often not of the same size, but are used in combination of multiple sizes, so the ratio of ball mill media is very important. At present, there are several methods for calculating the ratio of ball mill media:

A. The ratio is calculated according to the mass percentage of each size steel ball in the ball charge.

B. Calculate the medium ratio according to the percentage of the total mass of the steel balls of each size in the total ball charge and the diameter of the steel balls.

C. Calculate the medium ratio according to the total surface area of the steel balls of each size.

D. The ratio is calculated according to the proportion of the total mass of the steel balls of each size to the total mass of the ball charge and the surface area of a single ball.

E. The ratio is directly calculated according to the equal number of steel balls of each size.

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