FIELD: production of phosphoric fertilizers. SUBSTANCE: phosphate rock is ground in two stages by the use of press-rolls. Prior to the second stage the rock being ground is disintegrated and classified. Subsequently the coarse product is further disintegrated to a preset large size, and a fine product, after being charged from the classifier, is pressed and aggregated at another press-roll. EFFECT: intensified process of grinding. 1 dwg
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