90mm high-chrome grinding balls in the South African

Project Overview

A large copper mining producer in the Northern Cape Province of South Africa is attempting to enhance the grinding efficiency of its semi-autogenous (SAG) grinding process.
Type of ore: Hard porphyry copper ore (Bond ball mill operating index: 16 - 18 kilowatt-hours per ton)
Existing material: 90mm forged steel balls, with a high wear rate (1.4 kilograms per ton)
Objective: To reduce the amount of media used while maintaining particle size

SMAT Solution - High-chrome casting grinding balls

It have a service life that is 40% - 60% longer than that of forged steel, perform particularly well in abrasive ores. Their specifications are:
Composition: Chromium 18%, Carbon 2.5%, Molybdenum 1.2% (Rockwell hardness 62-66)
Impact toughness: ≥ 8 joules per square centimeter
Manufacturing accuracy: Cast by sand mold and undergo quenching and tempering treatment. 100% hardness mapping (hardness variation does not exceed 3HRC)

Customer Feedback
The performance of the high-chromium balls exceeded our expectations. We extended the replacement of the liner from 6 months to 9 months, saving $650,000 in maintenance downtime each year. "*
John Van der Merwe, supervisor of the Mill Factory

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