摩尔配比和矿物掺合料对盐湖提锂镁渣制作磷酸钾镁水泥性能影响的研究
Effects of Molar Ratios and Mineral Admixture on Magnesium Potassium Phosphate Cement Prepared by the Product of MgO After Producing Li2CO3 From Salt Lakes 
投稿时间:2021-04-25  修订日期:2021-10-19
DOI:10.12119/j.yhyj.202203009
中文关键词:  磷酸钾镁水泥  盐湖提锂镁渣  矿物掺合料
英文关键词:Magnesium phosphate cement  Byproduct after producing Li2CO3 from salt lakes  Mineral admixture
基金项目:国家自然科学基金(52002202,51662035);青海省应用基础研究项目(2019-ZJ-7005);青海省科技基础条件平台(2018-ZJ-T01);中国科学院西部之光项目
作者单位
陈文海 中建安装集团有限公司一公司,山东 济南 250000 
吴成友 青海大学土木工程学院,青海 西宁 810016
青海省建筑节能材料与工程安全重点实验室,青海 西宁 810016 
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中文摘要:
      使用盐湖提锂镁渣和矿物掺合料,如粉煤灰、硅灰和矿渣等,与磷酸二氢钾反应,制作磷酸钾镁水泥(Magnesium Potassium Phosphate Cement,MKPC)。研究了MgO/KH2PO4摩尔配比(M/K)和矿物掺合料对MKPC凝结时间、抗压强度和水化放热速率的影响,并使用X射线衍射(X-ray diffraction,XRD)和低真空扫描电子显微镜(Scanning Electron Microscopy,SEM)分析MKPC的水化产物。研究表明,M/K对MKPC抗压强度影响显著,最佳M/K为4~6。M/K为5时,MKPC在各龄期的抗压强度值均较高,28d抗压强度高达98MPa。掺加矿物掺合料会降低MKPC的抗压强度,当粉煤灰、硅灰和矿渣的掺量分别为水泥质量的20%,10%和20%时,28d抗压强度可以分别达到45.9MPa、33.3MPa和36.7MPa。凝结时间超过20min,能够满足快速修复的要求。在不考虑Mg3B2O6的影响下,掺加矿物掺合料会延缓MKPC凝结时间和降低放热速率。
英文摘要:
      Potassium magnesium phosphate cement was prepared by using byproduct after producing Li2CO3 from salt lakes and mineral admixture such as fly ash,silica fume and slag and potassium dihydrogen phosphate.Here,effects of molar ratios and mineral admixture on the properties of MKPC,such as compressive strength,setting time and hydration-heat release rate have been studied.X-ray diffraction and scanning electron microscopy were used to examine the hydration products of MKPC.The results showed that M/K had a significant effect on the compressive strength of MKPC,and the optimum M/K is 4~6.When M/K was 5,the compressive strength of MKPC at each curing time was higher,and the compressive strength at 28d was as high as 98 MPa.The compressive strength of MKPC pastes were decreased by the addition of mineral admixture and when the content of fly ash,silica fume and slag was 20 %,10 % and 20 % of cement,the 28-day compressive strength can reach 45.9 MPa,33.3 MPa and 36.7 MPa,respectively.And the setting time were more than 20 minutes,which met the rapid-repair requirements.Without considering the effect of Mg3B2O6,adding mineral admixtures can delay the setting time and reduce the heat-release rate of MKPC.
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