A Review of the Modeling of High Pressure Grinding Rolls

Abstract

High Pressure Grinding Rolls (HPGR) technology is accepted as an energy-efficient and cost-effective alternative for treating specific mineral ore types. HPGR technology has been advancing within manufacturing facilities and research centers since its first installation in 1985. Over the last three decades much of the literature on HPGR have focused on the industrial applications and trade-off studies in comparison with semi-autogenous and ball milling circuits. Literature on fundamental studies of HPGR technology has been very limited. This paper aims to provide a review of the modeling of high pressure grinding rolls.

HPGR as alternative to fused alumina comminution route: an assessment of circuit simplification potential

“…The pursuit of increased comminution efficiency is driven by the high production throughput required, poorer grades of ores, high steel con-sumption as a result of grinding ball and lining wear, and the low energy efficiency of conventional comminution technologies (Abouzeid and Fuerstenau, 2009). In such a context, HPGR (High Pressure Grinding Rolls) becomes an attractive option in terms of energy efficiency and cost effectiveness for processing certain ore types (Napier-Munn, 2015; Rashidi et al, 2017).…”

“…c 1where M is throughput (tph), U is the circumferential roll speed (m/s), L is the roll length (m), ρ g is the flake density (t/m³), x g is the operating roll gap (m) and c is a correction factor. Subsequently, with an aim to reduce the effect of equipment dimensions on throughput calculation, a specific throughput index was established (Rashidi et al, 2017). This parameter, which is characteristic of an HPGR's operation, is usually assumed as similar in both industrial and laboratory units and can be used to directly scale-up for the throughput of an industrial unit (Patzelt et al, 2000;Morley, 2006).…”

“…The specific grinding force determines the product size distribution and is directly related to the specific comminution energy (Schönert, 1988;Patzelt et al, 2000;Daniel, 2002). Taking as a basis the aforementioned key HPGR design parameters, a number of mathematical models has been proposed in literature with an aim to predict HPGR behavior, particularly for the purpose of scaling-up for industrial units (Rashidi et al, 2017). The model developed by Morrell et al (1997) is available in the JKSimMet ® process simulation software and is comprised of three submodels: throughput, power, and prod-uct size distribution.…”

“…Since the HPGR started to be manufactured on a commercial scale in the 1980s, it has found widespread application, especially in the cement industry, but also in the comminution of several ores, such as iron (crushed ore and pellet feed), diamond, copper, gold, platinum, and limestone, among others (Morley, 2006;Morley, 2010;Rashidi et al 2017). However, its use in the processing of abrasive grains, such as fused alumina, has been little exploited in the scientific literature (Karimi and Djokoto, 2012).…”

O High Pressure Grinding Rolls como alternativa à cominuição de óxido de alumínio eletrofundido: uma avaliação do potencial de simplificação de um circuito.

“…Neste processo, a densidade aparente do material aumenta gradualmente, atingindo até 85% da densidade real do material. Em seguida, as partículas sofrem descompressão, deixando o equipamento em formato de floco (flake) ou em fluxo livre (SCHÖNERT, 1988;SCHÖNERT, 1991a;SCHONERT;LUBJUHN, 1993;RASHIDI, RAJAMANI;FUERSTENAU, 2017). A Figura 5 ilustra este processo, bem como as suas variáveis geométricas.…”