Low chromium cast iron grinding ball

The grinding ball of low chromium cast iron is made of low chromium white cast iron. The iron mold casting process is typically used, and the chromium content ranges from 1% to 3%. Because of its straightforward manufacturing process, low alloy content, and minimal demands on the labor force's skills and working conditions, low chromium cast iron grinding balls are relatively affordable.

Low chromium cast iron grinding balls continue to hold some market share, primarily due to the low price and the existence of a market for small mills with light performance demands. However, it has some flaws, chiefly these:

- Low toughness, low wear, and low hardness. Impact toughness of low chromium grinding balls is 2 J/cm2, and their HRC is 45; According to domestic concentrators' annual wear statistics, the average wear of low chromium cast iron grinding balls in nonferrous alloy copper ores is 0.8 kg/t to 1.0 kg/t, with high wear. Iron ore wears out at a rate of about 1.2 kg/t to 1.5 kg/t.

- It is not round and is easily broken. The grinding efficiency is significantly decreased by the low chromium cast iron grinding ball's low hardness, ease of being out of round, high rate of crushing, and ease of clogging the mill spacer, as depicted in the figure.

The requirements for the grinding ball's anti-crushing, wear, and energy-saving abilities increase along with the size of the ball mill in the mining industry, and the use issues with low chromium cast iron grinding balls become more and more obvious. As a result, the domestic market for low chromium cast iron grinding balls has gradually declined.