COMPOSITION OF FILLING MIXTURE Russian patent published in 2002 - IPC

FIELD: mining industry; applicable in mineral mining with filling of worked-out space. SUBSTANCE: filling mixture includes cement, ground blast-furnace granulated slag, inert filler and water. Inert filler is used in form of amorphous sediments of neutralization of sulfuric acid with limestone. Said sediments are preliminarily treated with aqueous solution of ferric hydroxysulfate Fe(OH)SO₄. Composition contains the following amounts of components, wt.%: cement, 4.0-6.8; ground blast-furnace granulated slag, 9.7-16.5; amorphous sediments of neutralization of sulfuric acid with limestone, 31.7-40.8; ferric hydroxysulfate, 1.2-2.0; water, the balance. EFFECT: higher strength of filling mixture, utilized wastes of hydrometallurgical production, reduced pollution of environment. 2 tbl