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利用盐湖提锂副产含硼氧化镁制备粉煤灰磷酸钾镁水泥
作者:谭永山1 3 余红发1 2 李颖1 董金美1 文静1 吴成友1 肖卫2 
单位:1.中国科学院青海盐湖研究所盐湖资源与化学重点实验室 西宁810008 2.南京航空航天大学土木工程系 南京210016  3.中国科学院大学 北京100049 
关键词:盐湖提锂副产含硼氧化镁 磷酸钾镁水泥 耐水性 粉煤灰 
分类号:TQ132.2
出版年,卷(期):页码:2014,42(11):1362-1369
DOI:10.7521/j.issn.0454-5648.2014.11.03
摘要:

 利用盐湖提锂副产含硼氧化镁(B­MgO)和磷酸二氢钾(KH2PO4, KDP)制备了不同粉煤灰掺量的磷酸钾镁水泥(MKPC)。研究了粉煤灰掺量对MKPC浆体的凝结时间、抗压强度及不同浸泡条件下对MKPC抗水性和耐海水腐蚀性能的影响,并对MKPC的物相组成和微观形貌进行了分析。结果表明:粉煤灰的掺入可延长MKPC的凝结时间,当粉煤灰掺量低于30%时,MKPC的后期抗压强度随粉煤灰掺量的增加而增大,同时掺入粉煤灰还可明显改善MKPC的抗水性和耐海水侵蚀性能;当粉煤灰掺量为40%时,制备出的粉煤灰MKPC可以满足其作为快速修补材料的各项要求。此外使用盐湖提锂副产B­MgO和KDP制备的粉煤灰MKPC可以明显降低MKPC材料的制备成本。

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  Magnesium potassium phosphate cement (MKPC) was prepared with a byproduct of boron­containing magnesium oxide (B­MgO) in the  production of Li2CO3 from salt lakes.The influence of fly ash content on the setting time and compressive strength of MKPC was investigated.The water resistance of MKPC mortar prepared at various fly ash contents under different steeping conditions was determined.The component and microstructure of the MKPC were investigated.The experimental results demonstrate that the setting time and the aged compressive strength of MKPC increase with the increase of fly ash content when the fly ash content is<30%.Also, the addition of fly ash can improve the water resistance and seawater corrosion resistance of MKPC mortar.When the fly ash content is40%, all the properties of fly ash MKPC can meet the requirements of rapid repair materials.Besides, the preparation of fly ash MKPC with the byproduct B­MgO and KDP can reduce the material cost.

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基金项目:
基金项目:国家自然科学基金项目(21276264).
作者简介:
第一作者:谭永山(1985—),男,硕士研究生。 通信作者:余红发(1964—),男,博士,教授。
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