FIELD: building industry. SUBSTANCE: invention relates to production of building materials and can be used for preparing expanded clay aggregate. Method for preparing swelling component for raw mixture in production of expanded clay aggregate involves conditioning dehydrated deposit of sewage from leather plants formed in treatment of sewage with hydrolyzing iron and aluminum salts. After thickening and mechanical dehydration this deposit with moisture 82-85 wt.-%, content of organic matter 61.87-62.00 wt.-% and inorganic matter 38.00-38.13 wt.-% by dry residue using high- molecular flocculant the conditioning is carried out with leather dust in the mass ratio of deposit to dust = 1 : (0.2-0.3) up to friable state and at residual moisture of mixture 65.15-70.10 wt.-%. Method involves the use of leather dust forming in polishing face and flesh side of hide containing, wt.-%: fatty substances, 12-16; protein substances, 69.2-71.7; moisture, 9.0-10.5; inorganic matter, the balance. Invention provides expanding application field of industrial waste, improvement of ecology state due to reduction of waste amount removing to dump, reduction time of drying process (conditioning). EFFECT: improved preparing method. 2 tbl, 2 ex
