التفاصيل البيبلوغرافية
| العنوان: |
混合相磷石膏基胶结材制备与早期性能研究. (Chinese) |
| Alternate Title: |
Research on preparation and early performance of mixed phase phosphogypsum⁃based cementing materials. (English) |
| المؤلفون: |
王茹霆, 赵小蓉, 黄绪泉, 王豪杰, 薛 菲, 蔡家伟 |
| المصدر: |
Inorganic Chemicals Industry; Mar2024, Vol. 56 Issue 3, p98-154, 8p |
| Abstract (English): |
Mixed phase phosphogypsum was used as the main raw material，and slag，red mud，metakaolin and clinker were added to prepare mixed phase phosphogypsum⁃based cementing material.Its early performance was studied by compressive strength，pH and leaching toxicity tests，and the hydration mechanism was elaborated by X-ray diffraction（XRD），scanning electron microscope（SEM） and Fourier transform infrared spectroscopy（FT-IR） tests. The results showed that 53.76% （mass fraction，the same below） of mixed phase phosphogypsum，9.68% of slag，9.68% of red mud，16.13% of metakaolin and 10.75% of clinker could prepare the mixed phase phosphogypsum cementing material with optimized performance，and its compressive strength at the 3，5 d and 7 d were 8.93，10.99 MPa and 13.14 MPa respectively.Its pH alkalinity was lower than that of traditional cement-based materials，and the leaching concentration of PO4 3- and F- were lower than the limit of the integrated wastewater discharge standard.The results of microscopic analysis showed that phosphogypsum was calcined at 400 ℃ for 60 min to form hemihydrate⁃anhydrate mixed phase phosphogypsum，in which the relative contents of hemihydrate and anhydrate gypsum were 31.7% and 68.3% respectively.The hydrated calcium silicate gel，ettringite and brushite generated by hydration of mixed phase phosphogypsum⁃based cementing materials formed dense structures，which would improve the strength of materials and block the leaching of pollutants.The mixed phase phosphogypsum⁃based cementing material had good mechanical properties and environmental compatibility，which provided a new potential way for the large - scale consumption of phosphogypsum. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
以混合相磷石膏为主要原料，掺入矿渣、赤泥、偏高岭土、熟料制备混合相磷石膏基胶结材，通过抗压强 度、pH和浸出毒性测试研究其早期性能，采用X射线衍射（XRD）、扫描电镜（SEM）和傅里叶变换红外光谱（FT-IR） 测试分析水化机理。结果表明：53.76%（质量分数，下同）混合相磷石膏、9.68%矿渣、9.68%赤泥、16.13%偏高岭土 和10.75%熟料可制备出性能最优的混合相磷石膏基胶结材，其3、5、7 d抗压强度分别达到8.93、10.99、13.14 MPa， pH碱性低于传统水泥基材料，总磷、氟化物浸出浓度均满足污水综合排放标准要求；磷石膏在400 ℃下煅烧60 min 形成半水-无水混合相磷石膏，其中半水石膏和无水石膏的相对含量分别为31.7%和68.3%。混合相磷石膏基胶结 材水化生成的水化硅酸钙凝胶、钙矾石和透钙磷石等物质形成致密结构，提升材料强度，阻隔污染物F- 、PO4 3- 浸出。 混合相磷石膏基胶结材具有良好的力学性能和环境相容性，可为磷石膏规模化消纳提供新途径。 [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
