作者:杜德堃，余红发，吴成友
Authors:DUDekun, YUHongfa, WUChengyou摘要: 针对我国碳酸锂生产过程中会产生大量难以利用的废弃镁渣这一问题,为实现资源的循环利用与绿色发展,实验采用青海盐湖卤水提锂副产品提锂镁渣( B-MgO) 与磷酸二氢钾( KH2 PO4 ) 制备出用于骨粘接的磷酸钾镁水泥( magnesium potassium phosphate cement,MKPC)。 采用 M / P( 镁磷比) 为 1. 5,W/ C( 水灰比) 为 0. 18 的配合比;利用X 射线衍射仪( XRD)、扫描电子显微镜( SEM)、等温量热仪、强度试验机等试验设备,研究了MKPC 的凝结硬化性能、水化温升、水化产物组成与微观结构形貌;探讨了 MKPC 在模拟体液中抗压强度与抗折强度的发展规律。 结果表明,利用盐湖提锂镁渣制备的 MKPC 骨水泥,凝结硬化时间明显延长,终凝时间达到 30 min 以上;早强特征明显且强度发展迅速,自然环境中 3 h 抗压强度达33. 5 MPa,28 d 抗压强度最高可达107. 7 MPa,通过线性拟合得出 MKPC 骨水泥在自然环境与模拟体液环境中的强度增长关系式;MKPC 骨水泥在模拟生理体液中的抗压和抗折强度约为自然环境中的 68. 1% 与 71. 1% ,满足强度要求;当掺加 1. 5% 葡萄糖时,能够将基准 MKPC 骨水泥的绝热温升从 64. 7℃ 降低到 42. 0℃ ,满足骨水泥标准对放热温度不超过 50℃ 的要求。
Abstract: In response to the problem that a large number of difficult to use waste magnesium slag will be generated during lithium carbonate production in China, to realize the recycling and green development of resources, experimental preparation of lithium magnesium phosphate cement ( magnesium potassium phosphate cement, MKPC) for bone bonding was prepared by lithium halide extraction by-product from Qinghai Salt Lake with potassium dihydrogen phosphate ( KH2 PO4 ). The fitting ratios of M / P ( magnesium phosphorus ratio) 1. 5, W/ C ( water ash ratio) 0. 18 were used. The coagulation hardening properties, hydration temperature rise, composition of hydration products, and microstructure morphologies of MKPC were investigated by using X-ray diffractometer ( XRD), scanning electron microscope ( SEM ), isothermal calorimeter, and strength testing machine, as well as the following testing equipment. The development of compressive strength and fracture resistance of MKPC in simulated body fluid was explored. The results showed that mkpc bone cement prepared by using lithium magnesium slag extracted from salt lake had a significantly longer setting hardening time, and the final setting time reached more than 30 min. The early strong characteristics were obvious and the strengthdeveloped rapidly, up to 33. 5 MPa compressive strength at 3 h and 107. 7 MPa at 28 d in natural environment, through linear fitting ofthe strength data yielded the strength growth relationship between MKPC bone cement in natural environment and simulated body fluid environment. Compressive and fracture resistance strength of MKPC bone cement in simulated physiological body fluid is about 68. 1% to 71. 1% in natural environment, satisfying the strength requirement. When 1. 5% glucose was incorporated, it was able to reduce the thermal insulation temperature rise of benchmark mkpc bone cement from 64. 7 to 42. 0℃ , avoiding damage to bone tissue and meeting the requirements of bone cement standard for exothermic temperature not exceeding 50℃.

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