Application of oil-containing gabbro-diabase waste sludge for ceramic products manufacturing

Abstract

Abstract The paper presents research findings of the possibility of recycling and using the oil-containing sludge, generated at water-oil emulsions purification with gabbro-diabase powder, in ceramic constructional products manufacture. It is suggested to add the sludge to clay mass as a mineral and pore-forming admixture. The influence of the added sludge weight on such physical and mechanical parameters of ceramic samples as strength, compressive strength, water absorption, air shrinkage and firing shrinkage values and density was studied. The ceramic samples were prepared using natural clays from the Bessonovka (Belgorod region) and Podgornoye (Voronezh region) deposits. It has been demonstrated that adding the sludge to clay mass in amount of 2% wt. increases the compressive strength of samples by 90%, the air shrinkage by 1%, and water absorption by 1-2%. The firing shrinkage stays the same. At increasing the amount of the added sludge up to 7% all the parameters are slightly changed – water absorption and air shrinkage are increased, compressive strength, firing shrinkage and density are reduced. But further, at 7% sludge content in the clay mix the ceramic samples’ strength meets the grade not lower than 150 by GOST 530-2012.