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2020/09/21· Primary Impact Crusher Primary impact crushers are preferred for their high performance and high reduction ratios in crushing soft-character substances like gypsum and limestone. Due to the different principle of crushing these materials, the reduction ratio is higher than in jaw crushers.
In a HSI crusher, materials undergo impaction when they reach the breaker-plate, at which point hammers that are fixed to the outer edge of a spinning rotor, are used to impact the material. HSI crushers can be used for wet or dry materials, but not sticky materials, and are best suited for soft materials such as dolomite aluminum,weathered shale and clay.