Fabrication of high-performance glass-ceramics from blast furnace slag and coal fly ash

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management Pub Date : 2025-05-09 DOI:10.1016/j.wasman.2025.114866

Kai-Qi Cao, Guo-Hua Zhang

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Abstract

Glass-ceramics were prepared through the powder sintering method by directly using blast furnace slag and coal fly ash (CFA), both of which are glassy state dominated. Due to the high basicity and fast crystallization characteristic of the blast furnace slag which could hinder sintering densification, the high energy ball milling treatment of blast furnace slag together with CFA (ultra-low basicity waste) was conducted to refine the particle size and achieve a “cold adjusting” effect, thereby promoting the sintering ability of the blast furnace slag. The effects of CFA addition content, particle size of raw materials and sintering temperature on sintering behavior, crystalline phase, micro-structure and mechanical properties of as-prepared glass-ceramics were investigated. Results showed that the addition of CFA facilitated the densification of blast furnace slag during sintering process. The densification degree and flexural strength increased with the increase in the proportion of CFA addition, reaching the highest values when the addition ratio was 50 %. Meanwhile, the flexural strength first increased with the rise in sintering temperature and then experienced a slight decrease at 1000 °C. When the CFA addition ratio was 50 % and the sintering temperature was 950 °C, the flexural strength of sintered samples reached 168.95 MPa, with an acid resistance of 96.86 % and an alkali resistance of 98.99 %.

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利用高炉矿渣和粉煤灰制备高性能微晶玻璃

以玻璃态为主的高炉矿渣和粉煤灰为原料，直接采用粉末烧结法制备微晶玻璃。针对高炉矿渣碱度高、结晶快，不利于烧结致密化的特点，将高炉矿渣与超低碱度废CFA（超低碱度废）进行高能球磨处理，细化矿渣粒度，达到“冷调节”效果，从而提高了高炉矿渣的烧结性能。研究了CFA添加量、原料粒度和烧结温度对微晶玻璃烧结性能、晶相、显微组织和力学性能的影响。结果表明：在烧结过程中，CFA的加入促进了炉渣的致密化。致密度和抗弯强度随CFA添加比例的增加而增加，当添加比例为50%时达到最大值。同时，随着烧结温度的升高，材料的抗弯强度先升高，在1000℃时略有下降。当CFA添加比为50%，烧结温度为950℃时，烧结试样的抗弯强度达到168.95 MPa，耐酸性能为96.86%，耐碱性能为98.99%。

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来源期刊

Waste management 环境科学-工程：环境

CiteScore

15.60

自引率

6.20%

发文量

492

审稿时长

39 days

期刊介绍： Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes. Scope: Addresses solid wastes in both industrialized and economically developing countries Covers various types of solid wastes, including: Municipal (e.g., residential, institutional, commercial, light industrial) Agricultural Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)