Utilization of waste phosphate aluminum slag for cement manufacture |
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| Institution: | 1. College of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng, 224000, China;2. Department of Chemical Engineering, Monash University, Wellington Road, Clayton, Victoria, 3800, Australia;3. College of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, 232000, China |
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| Abstract: | The objective of this study was to investigate the feasibility of application of waste phosphate aluminum slag (PAS) for cement manufacture. To recycle waste PAS and minimize adverse effects on cement hydration induced by phosphate, NH4OH was used to purify PAS. X-ray diffraction (XRD) analysis was used to determine to confirm the removal of harmful phosphate. The effect of PAS on the hydration product composition, heat release and compressive strength was also investigated. The results demonstrated that NH4OH was effective in removing harmful AlPO4 in PAS and 10% NH4OH was considered as the optimal treatment concentration. In addition, the purification of NH4OH alleviated the delay in cement hydration caused by AlPO4 and the heat release curve of purified PAS (PPAS) cement tends to that of OPC. Moreover, the compressive strength of PPAS mortar at 28 days was 49.4 MPa, which is 18% higher than the compressive strength of PAS mortar. PAS purified by NH4OH can be applied to cement manufacturing. |
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| Keywords: | Phosphate aluminum slag Cement Purification Cement hydration |
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