One of the most important subjects in HPGR is the wear of the roll surface. To date, most applications in the cement industry have hard-faced smooth rolls, frequently with a hard-facing welded rim pattern on the surface for a better surface grip. High maintenance efforts — often requiring frequent rewelding of these roll surfaces. For this reason, HFKG has found a new way to solve the problem .The new style of rolls provide a longer wear life due to a more wear resistant surface and the embedding of an autogenous wear layer. This autogenous wear layer is formed by the ore packing itself between the studs on the rolls. This way the roll surface is coated and protected from the direct wear of the mineral rock.
The autogenous surface generally prevents the larger rocks from a direct impingement on the roll surface, and provides a shield from the abrasive movement of material parallel to the roll surface. The wear thus becomes principally that of the hard metal studs, which are much more resistant.
