一种新型钢渣基免烧陶粒滤料的制备及其性能研究

沈鑫宇; 闫肖雅; 林杨; 徐悦清; 刘荣

doi:10.12153/j.issn.1674-991X.20220709

一种新型钢渣基免烧陶粒滤料的制备及其性能研究

doi: 10.12153/j.issn.1674-991X.20220709

沈鑫宇^1,,
闫肖雅¹,
林杨²,
徐悦清³,
刘荣^1, ,

1.
南京师范大学环境学院, 江苏省物质循环与污染控制重点实验室, 江苏省地理信息资源开发与利用协同创新中心
2.
北京中冶设备研究设计总院有限公司
3.
生态环境部南京环境科学研究所

基金项目: 国家重点研发计划项目（2018YFD1101001）

详细信息

作者简介:
沈鑫宇（1997—），男，硕士，研究方向为固体废物资源化利用，821744971@qq.com

通讯作者:
刘荣（1965—），女，教授，博士，研究方向为固体废物资源化利用，liurongnjnu@123.com

中图分类号: X705
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- 文章访问数: 475
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- 被引次数: 0
出版历程
- 收稿日期: 2022-07-11
- 录用日期: 2023-03-22
- 网络出版日期: 2022-10-28

Preparation and performance study of a new type of steel slag-based non-fired ceramsite filter media

1.
Jiangsu Key Laboratory of Material Recycling and Pollution Control, Collaborative Innovation Center for Development and Utilization of Geographic Information Resources in Jiangsu Province, School of Environment, Nanjing Normal University
2.
Beijing MCC Equipment Research and Design Institute Co., Ltd.
3.
Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment

摘要

摘要:
采用免烧工艺以钢渣为主要原料制备陶粒滤料，并用其替代高炉底滤法水冲渣工艺过滤池中的鹅卵石，为钢渣资源化利用提供新思路。在确定基础配比（钢渣:水泥为2.0）后，选取石膏和水玻璃作为激发剂研究其对滤料性能的影响。最终选取石膏添加量为8%作为滤料的最优制备参数，此时滤料颗粒强度为4.14 MPa，1 h吸水率为9.05%，颗粒密度为1.49 kg/m³，25次抗冷热冲击后强度降幅仅为3%，过滤速度为5.92 mm/s。借助X射线衍射仪(XRD)与扫描电子显微镜(SEM)对滤料进行物相组成和微观形貌的表征，发现所使用的激发剂可促进钢渣中主要矿物C₃S和C₂S的水化反应，生成C—S—H类凝胶，这些水化产物相互交织黏结，使滤料内部孔隙率降低，滤料颗粒强度和25次抗冷热冲击性能不断提升。该系列滤料同时也可作为建筑陶粒应用于建材骨料等。
- 钢渣 /
- 免烧滤料 /
- 激发剂 /
- 水化反应 /
- C—S—H
Abstract:
The non-burning process was adopted to prepare ceramic granule filter media with steel slag as the main raw material. It was used to replace the cobblestone in the filter tank of the blast furnace bottom filtration water flushing slag process, providing a new idea for the resource utilization of steel slag. After determining the base ratio of steel slag to cement of 2.0, gypsum and water glass were selected as activators to study their impact on the performance of the filter media. Finally, an 8% gypsum addition was selected as the optimal preparation parameter for the filter material. At this time, the particle strength of filter media was increased to 4.14 MPa, the 1 h water absorption rate was 9.05%, the particle density was 1.49 g/cm³, the decrease in strength was only 3% after 25 times of cold and hot impacts, and the filtration speed was 5.92 mm/s. With the help of X-ray diffractometer (XRD) and scanning electron microscope (SEM), the physical composition and microscopic morphology of the filter media were characterized. It was found that the exciter used could promote the hydration reaction of the main minerals C₃S and C₂S in the steel slag to produce C—S—H type gels, and these hydration products intertwined and bonded to reduce the porosity inside the filter media and improve the filter media particle strength and 25 times of cold and hot impacts continuously. This series of filter media could also be used as construction ceramic pellets for building materials, such as aggregate.
- steel slag /
- non-fired filter media /
- activators /
- hydration reaction /
- C—S—H

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图 1 钢渣的物相组成分析

Figure 1. Analysis of phase composition of steel slag

下载: 全尺寸图片幻灯片

图 2 钢渣基免烧滤料制备工艺流程

Figure 2. Process flow chart of preparation of steel slag-based non-burning filter balls

下载: 全尺寸图片幻灯片

图 3 钢渣基免烧滤料照片

Figure 3. Photo of steel slag-based non-burning filter balls

下载: 全尺寸图片幻灯片

图 4 钢渣∶水泥对滤料物理性能的影响

Figure 4. Effects of different steel slag/cement ratios on the physical properties of filter balls

下载: 全尺寸图片幻灯片

图 5 钢渣:水泥对滤料物相组成的影响

Figure 5. Effects of different steel slag/cement ratios on the phase composition of filter balls

下载: 全尺寸图片幻灯片

图 6 钢渣:水泥对滤料微观形貌结构的影响

Figure 6. Effects of different steel slag/cement ratios on the microstructure of filter balls

下载: 全尺寸图片幻灯片

图 7 石膏添加量对滤料物理性能的影响

Figure 7. Effects of different gypsum contents on the physical properties of filter balls

下载: 全尺寸图片幻灯片

图 8 石膏添加量对滤料物相组成的影响

Figure 8. Effects of different gypsum contents on the phase composition of filter balls

下载: 全尺寸图片幻灯片

图 9 石膏添加量对滤料微观形貌结构的影响

Figure 9. Effects of different gypsum contents on the microstructure of filter balls

下载: 全尺寸图片幻灯片

图 10 水玻璃添加量对滤料物理性能的影响

Figure 10. Effects of different sodium silicate contents on the physical properties of filter balls

下载: 全尺寸图片幻灯片

图 11 水玻璃添加量对滤料物相组成的影响

Figure 11. Effects of different sodium silicate contents on the phase composition of filter balls

下载: 全尺寸图片幻灯片

图 12 水玻璃添加量对滤料微观形貌结构的影响

Figure 12. Effects of sodium silicate contents on the microstructure of filter balls

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图 13 过滤装置示意

Figure 13. Schematic diagram of filter device

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图 14 物料产生咬合作用示意

Figure 14. Schematic diagram of the bite effect of the material

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图 15 激发剂激发作用示意

Figure 15. Schematic diagram of the excitation effect of the activator

下载: 全尺寸图片幻灯片

表 1 钢渣的主要化学成分分析

Table 1. Analysis of the main chemical composition of steel slag %　

CaO Fe₂O₃ SiO₂ MgO MnO Al₂O₃ P₂O₅ TiO₂ SO₃ Cr₂O₃

47.94 24.51 10.69 7.56 3.24 2.25 1.75 0.837 0.374 0.328

下载: 导出CSV

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