摘要
以磷渣和熟料为原料,在机械活化的基础上,通过添加复合早强剂和化学激发剂,解决了传统磷渣用量大时制备的水泥初凝和终凝时间长,早期强度低的瓶颈问题。实验研究了不同激发剂的配比和用量、早强剂添加量、粉磨时间等因素对试件初凝、终凝和强度的关系,以此为基础,通过正交试验优化了各因素最佳条件,研究表明:磷渣、水泥熟料各占50%,石膏、硫酸钠、硫酸铝、氢氧化钠外掺量分别为2.0%、0.6%、1.1%和0.4%,粉磨时间为40min,制备的少熟料磷渣水泥达到普通硅酸盐水泥P·O52.5R要求。借助XRD、SEM对优化方案不同养护时间试件的分析表征,初步探明了磷渣基少熟料水泥强度形成过程和机理,研究成果可为磷渣大宗化、高值化利用提供理论基础和技术支撑,对进一步提高我国磷渣资源化利用率具有十分重要意义。
Phosphorus slag and clinker were adopted as raw materials. On the basis of mechanical activation, the compound early strength agent and chemical activator were added to solve the bottleneck problems, such as prolonged time of initial setting and final setting as well as low strength in the early stage, that occur when a large amount of phosphorus slag is applied in preparing cement by traditional method. The experiment studied how the initial setting, final setting and strength of the test piece were related to the ratio and dosage of different activators, the additive amount of early strength agent, the grinding time and other factors. On this basis, the conditions of those factors were optimized through orthogonal test. The research shows that: the prepared low-clinker phosphorus slag cement met the requirements for ordinary Portland cement P·O 52.5R when the phosphorus slag and cement clinker each account for 50%, and the additive amount of gypsum, sodium sulfate, aluminum sulfate, sodium hydroxide are respectively 2.0%, 0.6%, 1.1% and 0.4% with grinding time as 40 min. Through the analysis and characterization of XRD and SEM on test pieces under different curing time in the optimized method, it preliminarily prove the formation process and mechanism of the strength of low-clinker phosphorus slag cement. The research results can provide theoretical basis and technical support for the large-scale and high-value utilization of phosphorus slag. It has a significant meaning for further improving the utilization rate of phosphorus slag in China.
作者
王涛
宋科鹏
彭泽斌
夏举佩
陈正杰
WANG Tao;SONG Ke-peng;PENG Ze-bin;XIA Ju-pei;CHEN Zheng-jie(Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,China;Faculty of Metallurgy and Energy Engineering,Kunming University of Science and Technology,Kunming 650500,China)
出处
《硅酸盐通报》
CAS
北大核心
2019年第6期1805-1811,共7页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金(21566018)
关键词
磷渣
水泥
正交试验
phosphorus slag
cement
orthogonal test
