• Journal of the Korean Ceramic Society
• /
• v.50 no.5
• /
• pp.319-325
• /
• 2013

In this study, petroleum cokes ash and $C_{12}A_7$-based slag were used for the shrinkage reduction and strength enhancement of mortar. The hydration properties of shrinkage reduction agents were analysed. The flow, change of length and compressive strength were experimented with mortar-added shrinkage reduction agents. As a result of this study, petroleum cokes ash : $C_{12}A_7$-based slag = 60~80% : 20~40% showed excellent results. In the case of mortar with 20% $C_{12}A_7$-based slag, the setting time and change of length were similar to Ref. mortar. The flow and compressive strength were superior to Ref. mortar. In the case of mortar with a 40% $C_{12}A_7$-based slag, the setting time was longer than Ref. mortar. The compressive strength of 3 days and 7 days were superior to Ref. mortar.

• Applied Chemistry for Engineering
• /
• v.7 no.6
• /
• pp.1115-1124
• /
• 1996

An MCL(Molten Caustic Leaching) treatment is a chemical refinery process which is used for the desulfurization and demineralization by alkali treatment. The MCL treatment removes ash by converting mineral like Si, Fe, V, Ni etc. in petroleum cokes into soluble salts. The MCL has an advantage minimizing carbon loss in comparison to other desulfurization process. Reaction variables for the desulfurization and demineralization in the study were leaching temperature, leaching time, ratio of caustic to cokes, acid concentration and time for washing, and particle size. At the optimum condition, above 99% of desulfurization and about 90% of demineralization was obtained. FT-IR and SEM analysis showed that the structure and surface of the particle was closely related with the degree of sulfur and ash removal, and leaching temperature as well.