EFFECT OF CEMENT KILN CO-PROCESSING EXTRACTED RAFFINATE CUTTINGS ON PERFORMANCE OF THE CEMENT CLINKER

After the oil-bearing cuttings were extracted and degreased, the extracted raffinate cuttings were experimentally researched by the muffle furnace to simulate the co-processing of the cement kiln. Through the thermo-gravimetric analysis of the effect of extracted raffinate cuttings’ addition on the roasting process of cement, the results showed that after adding extracted raffinate cuttings, the decomposition temperature of calcium carbonate decreased by 13.2℃, and the addition of extracted raffinate cuttings was beneficial to making cement clinker. By measuring the content of f-CaO in cement clinker using ethylene glycol substitution method, it could be concluded that the proportion of solid waste added of 20% was the most suitable; the results of X-ray diffraction spectrum of cement clinker showed that the main mineral composition of cement clinker roasted with extracted raffinate cuttings was unchanged, but the addition of raffinate solids still affected the formation of cement minerals. At the same time, the results of XRD patterns of hydration samples of cement products showed that the addition of extracted raffinate cuttings would inhibit the cement hydration reaction rate, and the leaching concentration of heavy metals in cement co-processing products with extracted raffinate cuttings complied with safety limit of Technical Specification for Co-processing Solid Waste in Cement Kilns (GB 30760—2014), possessed no environmental safety risk of heavy metal leaching.