The grinding circuit at PT Newmont Nusa Tenggara (PTNNT) – Batu Hijau mine consists of two SABC (semi-autogenous milling, ball milling, pebble crushing) trains, including four 20′ × 33′6″ ball mills that have been lined with steel liners since the commissioning of the plant in 1999. During 2011 and 2012 an industrial trial was conducted to evaluate Poly-Met liners (a combination of rubber and steel liners). These new liners were installed in two of the ball mills (ball mills 1 and 2) and operated in parallel with ball mills 3 and 4 with steel liners.
The objective of the trial was to compare the plant
performance with the Poly-Met and steel ball mill liners with regards to wear
life, mill throughput, grind size and total unit costs. The trial was conducted
over the entire life of the liners. The evaluation methodology implemented
consisted of frequent spot sampling around the ball mill circuits, complete
surveys/audits in both ball mills, and detailed analysis of process data. This
paper presents the results of the industrial trial and main conclusions.
Maclean, A, Wirfiyata, F,
Khomaeni, G, Jankovic, A, Pasin, G and Valery, W, 2014. Ball mill Poly-Met liner
evaluation at PT Newmont Nusa Tenggara – Batu Hijau mine, in Proceedings
12th AusIMM Mill Operators’ Conference 2014 , pp 255–262 (The Australasian Institute of Mining and Metallurgy: Melbourne).