SGS can quantify the wear in your grinding circuit using the Bond Abrasion Test. This allows you to plan and predict liner replacement and maintenance.
The grinding circuit is the largest capital investment of your processing plant. Depending on the grindability of your orebody, abrasion will cause a certain amount of deterioration to the steel media and liners in your circuit. The Abrasion test will allow you to quantify this and design accordingly.
The Bond Abrasion Test determines the Abrasion Index, which is used to determine steel media and liner wear in crushers, rod mills, and ball mills. Bond developed the following correlations based on the wear rate in pounds of metal wear/kWh of energy used in the comminution process.
|Wet rod mill||Rods||lb/kWh||=||0.35(Ai – 0.020)0.2|
|Liners||lb/kWh||=||0.035(Ai – 0.015)0.3|
|Wet ball mill||Balls||lb/kWh||=||0.35(Ai – 0.015)0.33|
|Liners||lb/kWh||=||0.026(Ai – 0.015)0.3|
|Dry ball mill||Balls||lb/kWh||=||0.05Ai0.5|
(gyratory, jaw, cone)
|Liners||lb/kWh||=||(Ai + 0.22)/11|
|Roll crushers||Roll shell||lb/kWh||=||(0.1Ai)0.667|
The abrasion test was developed by Allis-Chalmers* using a method and apparatus used by the Pennsylvania Crusher Division of Bath Iron Works Corp. The equipment consists of a rotating drum into which dry ore samples are placed, with an impact paddle mounted on a centre shaft rotating at a higher speed than the drum. The paddle is made from standard alloy steel hardened to 500 Brinell. The Abrasion Index is determined from the weight loss of the paddle under standard operating conditions.
SGS's results are ranked against our AR MacPherson database so they can be compared against other ores.
Feed Sample Requirements:
1.6 kg of minus 3⁄4” plus 1⁄2” ore. This can normally be obtained by taking 5 kg of ore crushed to minus 3⁄4” and screening at 1⁄2”.
SGS's team of experienced engineers will conduct the Abrasion Test in combination with other bench-scale tests and circuit simulation. The use of many methodologies provides you with a bankable solution that is unmatched in its rigor.
* Bond F. C., “Metal Wear in Crushing and Grinding”, Allis-Chalmers Publication 07P1701, Dec 1963.