Choosing a Primary Impact Crusher: Silica-Free Limestone, Working Principle and Product Grading

Limestone quarries free of silica (SiO2) are where a primary impact crusher is used to best effect. Our primary impact crushers are designed to break medium-hard, low-abrasion material at the first crushing stage, in a controlled way and with a high reduction ratio. As a result, a block measuring 1300 mm and weighing up to 3000 kg can be reduced to 100 mm in these crushers.

Rock entering the crusher first starts to break under the blows of the rotor bars and through stones striking one another; it then completes its breakage by hitting the impact plates on the upper and lower aprons.

Our primary impact crushers are built both for fixed plants and as mobile units on semi-trailers. A design change we made at the feed opening has cut the stone jamming commonly seen in similar machines to the lowest level.

The size distribution of the product leaving the crusher is not fixed; it can vary with the size of the stone entering the crusher, the rotor speed, the setting gap and how easily the material breaks.