In calculating the unit price of steel balls, the total daily consumption of high-chromium balls needs 3.75X5300=19875 yuan, and the B2 material grinding ball needs 4.5X3500=15750 yuan per day. B2 material grinding ball can save 4,125 yuan per day, 120,000 yuan for mines a month, and 1.5 million yuan for mineral processing costs a year.