The Benefits of using High Pressure Grinding Rolls(HPGR)
Applying the HPGR process as a replacement for the conventional SAG milling circuit results in significant savings in energy costs, reduced grinding media consumption and operating costs, smaller footprint, faster equipment delivery schedules, and finer product.
It is estimated that energy savings of up to 20 percent can be reached and from 10 to 20 percent savings in operating costs is possible depending on the ore type and application. The savings in energy costs is also becoming better understood with more savings possible when additional HPGR stages are incorporated in grinding circuits. A further potential benefit of inter-particle crushing is improved recoveries from downstream processing as a result of micro cracking occurring within the particles. While the benefits of the HPGR in terms of lower energy costs and superior inter-particle crushing were well known, it has taken longer to embrace this technology especially for hard rock mining applications.