Evidence-first editorial standard
This guide separates observed facts, engineering assumptions and data that still require confirmation. It does not promise a universal service life or replace the exact product data and project specification.
The discharge chute under a crusher is the hardest lining duty in most plants
Coarse, angular ore leaves the crusher at speed and lands from height, so impact energy is high and repeated, and a lining chosen for abrasion alone fails by fracture or detachment. The construction is chosen for impact first, then for sliding wear in the run below.
Map where the energy lands before choosing anything
The first impact zone depends on the crusher type, the discharge opening and the drop height, and it shifts with feed size and throughput. The article on crusher discharge wear hotspots explains how to locate it from the worn surface, and why one-sided wear often points to an off-centre stream rather than to a weak liner.
A dead box often beats any lining in the first impact zone
A ledge or pocket that holds a bed of ore lets the material take the blow instead of the liner; the article on dead boxes and material beds sets out when this works and when the bed itself causes blockages. Where geometry or sticky ore rules out a dead box, the impact zone needs the toughest lining the space allows.
In the impact zone, toughness and backing matter more than hardness
Zirconia-toughened alumina blocks such as IC IMPACT resist chipping better than plain alumina, and rubber-backed composite panels such as IC FLEX absorb part of the energy. Thick abrasion-resistant steel remains the answer where lumps are very large. Below the impact zone, the run sees sliding abrasion and can take a harder, thinner face.
Edges and joints decide whether the lining stays on
At the lip and around openings, elements are exposed on two faces and release first; a step at a joint facing the stream becomes a new impact point. Protect edges with a heavier element or a steel nosing, stagger joints against the flow, and keep the retention positive — bolts or welds — in the impact zone rather than adhesive alone.
What to record and send before the next outage
Note the crusher type and setting, the top size of the product, the throughput, the drop height, the chute drawing with the impact zone marked, photographs of the current wear, the life of the current liners and the outage interval. The circuit-by-circuit guide to mining wear protection places this chute in the wider plant survey.