Abstract: The coal gangue (CG) can be prepared into active mixture material after it was calcined at suitable temperature and then ground. However, due to the complex composition of CG, its color changed greatly after it was calcined. The application of large amount of calcined coal gangue (CCG) in cement-based materials will affect the color of cement-based materials. It is of great significance for the application of CG in cement industry if CCG active powder material with small color difference from cement-based materials can be prepared. In this paper, the influence of preparation process on the color of CCG active powder material was explored; the color of CCG active powder materials was quantitatively characterized and evaluated based on Red, Green, Blue value in PS software; the mechanism of color transition of active powder materials prepared from granular coal gangue was analyzed. The results showed that, during the thermal activation, the redder the color of CCG active powder materials and the higher their Red value were beneficial to the smaller of CG, the longer the holding time of thermal activation and the more sufficient the oxygen in the calcination environment. The oxidation degree of carbon and siderite in CG was the main reason that affects the color of CCG active powder materials. When the black carbon was removed sufficiently and siderite was oxidized to hematite, the color of the material was red, but when carbon was not removed sufficiently and siderite was oxidized to magnetite, the color of the material was black.
作者简介: 刘朋,2019年6月毕业于安徽建筑大学,获得工程硕士学位。同年进入南京工业大学攻读博士学位,主要从事建筑功能材料、固体废弃物资源化利用研究。 王爱国,安徽建筑大学,教授,硕士研究生导师。2010年毕业于南京工业大学,获材料学博士学位。2017年于澳大利亚University of Southern Queensland, Centre for Future Materials做访问学者。主持和参与国家自然科学基金项目、安徽省高校自然科学研究重点研究项目、高性能土木工程材料国家重点实验室开放课题和材料化学工程国家重点实验室开放课题等省部级以上项目10项。Construction and Building Materials、Cement and Concrete Composites 、《材料导报》《硅酸盐通报》等学术期刊审稿人,中国建筑学会建筑材料分会化学激发胶凝材料专业委员会委员。主要研究方向为高性能水泥基材料/建筑功能材料/固体废弃物综合利用。
引用本文:
刘朋, 王爱国, 刘开伟, 马瑞, 徐海燕, 孙道胜, 经验. 粒状煤矸石制备活性粉体材料的颜色转变及其量化表征[J]. 材料导报, 2020, 34(16): 16037-16042.
LIU Peng, WANG Aiguo, LIU Kaiwei, MA Rui, XU Haiyan, SUN Daosheng, JING Yan. Color Transition and Its Quantitative Characterization of Active Powder Material Prepared from Granular Coal Gangue. Materials Reports, 2020, 34(16): 16037-16042.
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2020, Vol. 34 
