The research of grinding media in China started in 1981, which was later than the developed countries for more than 20 years. Before 1981, China was influenced by the former Soviet Union, main large state-owned enterprises adopted the rolling ball in the maximum number. There were three typical representatives: the Anshan Iron and Steel rolling ball machine No.1, Benxi Iron and Steel Company rolling ball machine No.1, Handan Iron and Steel Company rolling ball machine No.1, all of which served for the iron ore concentrator production.
From mid-1980s to the mid-1990s, the research, production and application of the grinding media are fruitful. It can be summed up in the following areas. Most of large and medium-sized iron ore concentrators have been started to use high-carbon steel grinding balls or low alloy steel quenching forging ball or rolling ball, instead of the ordinary low-carbon steel grinding balls.
(1) the high-carbon steel forging waste heat quenching steel ball. The Angang Donganshan sintering plant promotes the φ127 mm high-carbon steel forging waste heat quenching steel ball in paragraph φ3200 mm × 3100 mm - lattice-type ball mill, and in 3 years accumulatively saves balls for 650t, saving more than 33% consumption than the original low-carbon steel ball, increasing the Wear-resisting multiples 1.5 and the total save ball effective is 5.25 million yuan /a according to planning price. The grinding process has stopped to use low-carbon steel balls. Angang mining company promotes ￠60 mm high-carbon steel forging waste heat quenching steel ball in Donganshan sintering plant, Dagushan, Qidashan concentrator, whose unit consumption is 35% ~ 40% lower than the low-carbon steel balls.
(2) the mid-carbon and low chromium forging waste heat quenching steel ball. Luzhong metallurgical and mining company ore dressing plant promotes φIOO mm mid-carbon and low chromium forging waste heat quenching steel ball in the low carbon chrome forging concentrator φ2700 mm x 3600 mm sec lattice-type ball mill, whose consumption reduces from 0.817 kg / t of the original low-carbon steel ball of to 0 347 kg/t, saving consumption 57%, saving grinding balls costs$ 039 per ton of ore. If the total annual ore processing if 1.26 million tons, the saving balls per year will be 592 t and saving efficiency will be 255 million.
(3) high-carbon and low-alloy steel forging waste heat quenching steel ball. 4100 mm high-carbon and low-alloy steel forging waste heat quenching steel ball researched by Shandong Metallurgical Design and Research Institute is tested and applied in the Laiwu Iron Concentrator 42700 mm x 2100 mm ball mill industry, in which the ball consumption of the manganese cast iron reduces from 0 95 kg/t to 0 348 kg / t, saving consumption 63%, multiples wear-resistance 2.7. If the raw ore processing per year is 30 000 t, the saving ball per year will be 200 t.
