Reducing the size of crushed products is one of the effective ways to reduce energy consumption in mineral processing plants.

The size of ore to be ground in East Anshan beneficiation plant is reduced from 20-0mm to l2~0mm, which increases the processing capacity of ball mill by more than 16%.

The size of ore to be ground in Dashihe beneficiation plant is reduced from 15~0mm to 12~0mm, which increases the processing capacity of ball mill by 0.75t per hour, and the electricity consumption decreases by 2.34kW-h/, and the production cost of iron ore concentrate per ton decreases by 0.7 yuan, so the economic benefits are obvious.

At present, the main measures to reduce the size of crushed products are:

(1) transformation of the crushing and screening process, such as Daguoshan processing plant will be three open circuit crushing process into three - closed circuit crushing process, so that the size of the ore into the mill from 20-0mm down to 12 ~ 0mm, ball mill capacity increased by 3 ~ 7i. East Anshan processing plant has been three closed circuit into a closed circuit of four sections to further reduce the size of the ore into the mill.

(2) increase the number of fine crushing crusher and screening area, in Anshan, processing plant after the transformation of fine crushing products -12mm particle size content increased by 5%, screening equipment screening efficiency increased from 41.5% to 80%.

(3) transformation of crushing equipment, especially to improve the crushing and fine crusher liner, such as the 2100 fine crusher rolling wall installed in the crusher, the crusher liner parallel zone from 170mm to 250mm, the width of the discharge port can be reduced from 35 ~ 45mm to 20 ~ 25mm. improve the fine crusher liner, the parallel zone length from 250mm to The length of the parallel zone can be lengthened from 250mm to 350mm, and the width of the discharge opening can be reduced from 15~20mm to 12mm.

(4) Adopting new crushing equipment such as single-cylinder or multi-cylinder or super heavy hydraulic cone crushers, the parallel zone length, safety device and discharge opening of these crushers are controlled by hydraulic system, which can be adjusted according to the liner wear degree in time. The discharge opening of the super heavy duty short head cone crusher is adjustable to 6-7mm, which ensures the grain size of the final crushing output. East Anshan beneficiation plant also introduced the ultra-fine crusher to further reduce the size of the ore into the grinding mouth.

(5) Four HP800 cone crushers were installed in Qidashan beneficiation plant to achieve 90% of the -12mm grain size in the material to be crushed, achieving more crushing and less grinding, with significant economic benefits.

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