Preparation of a lightweight calcium silicate board using chlorine-containing Ti-extraction blast furnace slag and diatomite

IF 2.7 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of Material Cycles and Waste Management Pub Date : 2024-07-31 DOI:10.1007/s10163-024-02036-z

Lin Li, Tao Jiang, Qiang Yang, Yanli Ren, Jie Xu, Zhiqiao Li, Xinyu An

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Abstract

Chlorine-containing Ti-extraction blast furnace slag (TEBFS) is a solid waste produced during titanium removal from high-titanium blast furnace slag. Large amounts of TEBFS affect the local environment and severely limit further process development. A lightweight calcium silicate board was successfully prepared via hydrothermal synthesis. When the mass ratio of TEBFS: Portland cement: diatomite: calcium hydroxide: quartz was 46∶15∶17∶13.9∶8.1, the bulk density, bending strength, and thermal conductivity of the sample were 1.23 g/cm³, 8.2 MPa, and 0.299 W/(m·K), respectively. The overall sample performance met the D1.3 category requirements in the national standard. After being immersed in water with stirring at 30 °C for 60 min, the sample exhibited a curing chlorine efficiency of 40.6%. Mechanical grinding increased slag activity and sample performance. Grinding for 3 min, the activity index of the slag was 72.74%, and the bending strength of the sample increased to 8.7 MPa. Increasing the pozzolanic activity of the slag and reducing the amount of aggregate produced between particles had a positive effect on optimizing sample performance. This paper provides a feasible method for the diversification and clean utilization of TEBFS.

Graphical Abstract

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利用含氯钛提取高炉渣和硅藻土制备轻质硅酸钙板

含氯钛提取高炉渣（TEBFS）是从高钛高炉渣中提取钛的过程中产生的固体废物。大量的 TEBFS 会影响当地环境，严重限制了进一步的工艺开发。通过水热合成法成功制备了一种轻质硅酸钙板。当 TEBFS：硅酸盐水泥：硅藻土：氢氧化钙：石英的质量比为 46∶15∶17∶13.9∶8.1 时，样品的体积密度、抗弯强度和导热系数分别为 1.23 g/cm3、8.2 MPa 和 0.299 W/(m-K)。样品的整体性能符合国家标准 D1.3 类别的要求。在 30 °C 的水中浸泡并搅拌 60 分钟后，样品的固化氯效率为 40.6%。机械研磨提高了炉渣活性和样品性能。研磨 3 分钟后，矿渣的活性指数为 72.74%，样品的抗弯强度增至 8.7 兆帕。提高矿渣的水胶活性和减少颗粒间产生的骨料量对优化样品性能有积极作用。本文为 TEBFS 的多样化和清洁利用提供了一种可行的方法。

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来源期刊

Journal of Material Cycles and Waste Management 环境科学-环境科学

CiteScore

5.30

自引率

16.10%

发文量

205

审稿时长

4.8 months

期刊介绍： The Journal of Material Cycles and Waste Management has a twofold focus: research in technical, political, and environmental problems of material cycles and waste management; and information that contributes to the development of an interdisciplinary science of material cycles and waste management. Its aim is to develop solutions and prescriptions for material cycles. The journal publishes original articles, reviews, and invited papers from a wide range of disciplines related to material cycles and waste management. The journal is published in cooperation with the Japan Society of Material Cycles and Waste Management (JSMCWM) and the Korea Society of Waste Management (KSWM).