title: Preparation and mechanism of the sintered bricks produced from Yellow River silt and red mud.
abstract: The preparation, characteristics and mechanisms of sintered bricks manufactured by Yellow River silt and red mud were studied. The sintering shrinkage, weight loss on ignition, water absorption and compressive strength were tested to determine the optimum preparation condition. Sintering mechanisms were discussed through linear regression analysis. Crystalline components of raw materials and bricks were analyzed by X-ray diffraction. Leaching toxicity of raw materials and bricks were measured according to sulphuric acid and nitric acid method. Radiation safety of the sintered bricks was characterized by calculating internal exposure index and external exposure index. The results showed that at the chosen best parameters (red mud content of 40%, sintering temperature of 1050°C and sintering time of 2h), the best characteristics of sintered bricks could be obtained. The weight loss on ignition of sintered bricks was principally caused by the removal of absorbed water and crystal water. The sintering shrinkage of sintered bricks mainly depended on sodium compounds and iron compounds of red mud. The sintering process made some components of raw materials transform into other crystals having better thermostability. Besides, the leaching toxicity and radioactivity index of sintered bricks produced under the optimum condition were all below standards.
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China.
authors.forename: Hongtao
authors.initials: H
authors.lastname: He
authors.forename: Qinyan
authors.initials: Q
authors.lastname: Yue
authors.forename: Yuan
authors.initials: Y
authors.lastname: Su
authors.forename: Baoyu
authors.initials: B
authors.lastname: Gao
authors.forename: Yue
authors.initials: Y
authors.lastname: Gao
authors.forename: Jingzhou
authors.initials: J
authors.lastname: Wang
authors.forename: Hui
authors.initials: H
authors.lastname: Yu
mesh_terms: D002681:China; D018360:Crystallography, X-Ray; D019015:Geologic Sediments; D006358:Hot Temperature