摘要
提钛尾渣作为含钛高炉渣提钛后产生的一种含氯废弃物,一直缺乏有效的规模化利用技术,对环境具有潜在的危害。本文以提钛尾渣为主要原料,制备保温隔热材料——硅酸钙板,研究了不同钙硅比、硅藻土含量、水灰比、原渣与脱氯渣配比对材料性能、物相和微观形貌的影响。研究表明,随着脱氯渣含量的增加,硅酸钙板的抗折强度呈先增大后减小的变化规律,过量的硅藻土、过高的钙硅比和水灰比均不利于样品性能的改善。当提钛尾渣质量分数为46%(原渣和脱氯渣配比为1∶1)、硅酸盐水泥质量分数为15%、硅藻土质量分数为17%、钙硅比为0.84和水灰比为0.75时,硅酸钙板样品性能最优,其体积密度为1.25 g/cm^(3),抗折强度为10.4 MPa,导热系数为0.297 W/(m·K),样品中固化的氯离子质量分数为0.36%,固氯比达56%。
Titanium tailing slag,a chlorinated waste resulting from titanium extraction processes from high-titanium blast furnace slag,has historically lacked viable technologies for large-scale utilization,posing potential environmental risks.This study leveraged titanium tailing slag as the main ingredient in the development of thermal insulation materials,specifically calcium silicate boards,and evaluated the influences of various parameters such as calcium to silicate ratio,diatomite content,water-to-binder ratio,and mix proportion of raw to dechlorinated slag on the material's performance metrics,phase composition,and microscopic morphology.Findings indicate that the flexural strength of calcium silicate boards exhibits a pattern of initial increase followed by a decrease as the proportion of dechlorinated slag is raised.Excess diatomite,high calcium to silicon ratio,and elevated water-to-binder ratio adversely affect the enhancement of sample attributes.Optimal material properties are observed when the composition included 46%(mass fraction) titanium tailing slag(with an equal ratio of raw to dechlorinated slag),15%(mass fraction) silicate cement,17%(mass fraction) diatomite,a calcium to silicon ratio of 0.84,and a water-to-binder ratio of 0.75.Under these conditions,the calcium silicate board demonstrates superior characteristics:a bulk density of 1.25 g/cm^(3),a flexural strength of 10.4 MPa,a thermal conductivity of 0.297 W/(m·K),and a sample-contained chloride ion mass fraction of 0.36%,achieving a 56% chloride fixation ratio.
作者
安心宇
李林
张兰
姜涛
AN Xinyu;LI Lin;ZHANG Lan;JIANG Tao(School of Metallurgy,Northeastern University,Shenyang 110819,China;State Key Laboratory for Comprehensive Utilization of Vanadium and Titanium Resources,Pangang Group Research Institute Co.,Ltd.,Panzhihua 617000,China;Key Laboratory of Ecological Metallurgy of Multimetallic Ores(Ministry of Education),Shenyang 110819,China)
出处
《硅酸盐通报》
CAS
北大核心
2024年第9期3294-3302,共9页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(52174277,52374300,52204309)。
关键词
提钛尾渣
水洗脱氯渣
硅酸钙板
抗折强度
导热系数
固氯比
titanium tailing slag
washed dechlorinated slag
calcium silicate board
flexural strength
thermal conductivity
chloride fixation ratio
