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过程工程学报 ›› 2019, Vol. 19 ›› Issue (2): 370-376.DOI: 10.12034/j.issn.1009-606X.218312

• 过程与工艺 • 上一篇    下一篇

热处理温度对磷渣-煤矸石微晶玻璃结构和性能的影响

陈 伟， 管艳梅*， 刘开伟， 胡普华， 孙道胜   

  1. 安徽建筑大学材料与化学工程学院，安徽省先进建筑材料重点实验室，安徽 合肥 230022
  • 收稿日期:2018-10-11 修回日期:2019-02-16 出版日期:2019-04-22 发布日期:2019-04-18
  • 通讯作者: 管艳梅 1134895705@qq.com
  • 基金资助:
    煤矸石-磷渣低温制备CAS系微晶玻璃

The effects of heat treatment temperature on performance and structure of phosphorus slag-coal gangue glass-ceramics

Wei CHEN, Yanmei GUAN*, Kaiwei LIU, Puhua HU, Daosheng SUN   

  1. Anhui Key Laboratory of Advanced Building Materials, School of Materials and Chemical Engineering, Anhui Jianzhu University, Hefei, Anhui 230022, China
  • Received:2018-10-11 Revised:2019-02-16 Online:2019-04-22 Published:2019-04-18
  • Supported by:
    Preparation of CaO-Al2O3-SiO2 Glass-Ceramics from Coal Gangue and Phosphor Slag via Low-Temperature Sintering

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摘要： 以磷渣和煤矸石为原料，采用一步烧结法制备了性能优良的CaO?Al2O3?SiO2(CAS)系微晶玻璃，用差示扫描量热法(DSC)，X射线衍射(XRD)和扫描电子显微镜(SEM)等对其进行分析和表征，研究了热处理温度对微晶玻璃晶相组成、微观结构和宏观性能的影响规律。结果表明，固废利用率达100%，微晶玻璃性能良好；以磷渣和煤矸石为原料在1250℃下熔融2 h、于850℃热处理保温2 h可制备主晶相为假硅灰石Ca3(Si3O9)的微晶玻璃，其抗折强度、显微硬度和体积密度分别为74.4 MPa，566.9 HV和2.75 g/cm3。随热处理温度升高，微晶玻璃主晶相由Ca3(Si3O9)相转变为硅灰石CaSiO3相，晶体形态由球状向针状、短柱状改变，对提高微晶玻璃抗折性能有利，而显微硬度和体积密度均先增加后降低。

关键词: 磷渣, 煤矸石, 微晶玻璃, 热处理温度

Abstract: Phosphorus slag is an industrial waste produced in the production of yellow phosphorus by the electric furnace method. For each 1 t of yellow phosphorus produced, it is necessary to discharge 8~10 t of phosphorus slag. Coal gangue is a solid waste produced in the coal industry. It is discharged from 10% to 15% of annual coal production. It has accumulated more than 4.5 billion tons of storage, which is the largest solid waste in China. Since a large amount of unexploited solid waste occupied industrial and agricultural land, safety problems and environmental pressures are presented. The disposal of solid waste is an urgent task. Therefore, the effective use of the solid waste resources and turning waste into treasure have important practical significance. In recent years, the glass-ceramics based on solid waste has been widely used in building decoration field. However, the technology has not been widely used due to high cost and defects in the preparation process. In this work, the feasibility of preparing glass-ceramics by the combination of phosphorus slag and coal gangue was studied. The effects of heat treatment temperature on the crystalline phase composition, microstructure and properties of the glass-ceramics were also discussed via differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Powder base glass was obtained by melting phosphorus slag with coal gangue at 1250℃ for 2 h. The results indicated that the sintered glass-ceramics with pseudo wollastonite Ca3(Si3O9) as the main crystallization phase could be prepared after heat treatment at 850℃ for 2 h. The flexural strength, microscopic strength and bulk density of the sample were 74.4 MPa, 566.9 HV and 2.75 g/cm3, respectively. In addition, with the increase of heat treatment temperature, the main crystalline phase of the glass-ceramics changed from Ca3(Si3O9) to wollastonite (CaSiO3), the morphology of the crystal developed from spherical to the needle-like and short column, which were beneficial for improving the flexural strength. Both the microscopic strength and bulk density increased first and then decreased with the increase of heat treatment temperature.

Key words: phosphorus slag, coal gangue, glass-ceramics, heat treatment temperature