METHOD OF CONTROLLING GRINDING FINENESS OF LIMESTONE- NEPHELINE SLUDGE Russian patent published in 1997 - IPC

FIELD: production of mineral materials. SUBSTANCE: method is applicable in production of silica from alkaline aluminosilicates. Limestone sludge is subjected to sorting in 100-mcm sorter. A part of sorted limestone sludge with +100 mcm particles is mixed in repulper with industrial water and nepheline concentrate, whereupon sludge is directed to grinding. Remaining part of sorted sludge with -100 mcm particles is injected into mill. On outlet of the mill, grinding fineness of limestone-nepheline sludge is measured and signal of disagreement between measured and specified grinding fineness is received. In accordance to pi-low from found disagreement, angle at apex of milling cone of limestone sludge part being injected is changed. The larger disagreement, the larger angle at cone apex. EFFECT: enhanced efficiency of process. 1 dwg