少熟料磷渣基水泥的研究
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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40 min,制备的少熟料磷渣水泥达到普通硅酸盐水泥P·O 52. 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.
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.
引文
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[10]陈德谦.水泥中外掺磷渣微粉的试验研究[J].水泥工程,2015(1):12-17.
[11]刘湛新.水工混凝土低热硅酸盐水泥复掺磷渣粉配比设计[J].科技通报,2015,28(4):111-113.
[2]权娟娟,张凯峰,马斌.磷渣替代矿渣对水泥孔溶液pH值及水化进程的影响[J].硅酸盐通报,2016,35(8):2513-2517.
[3]漆贵海,彭小芹,王玉麟.碱磷渣加气混凝土的微观形貌及水化产物[J].湖南大学学报(自然科学版),2014(2):114-118.
[4]陈豪立.黄炉磷渣的综合利用途径[J].贵州化工,1999(4):7-9.
[5]孙少鹏.磷渣在水泥工业中的应用研究[J].建筑材料与电器,2016(35):124-125.
[6]陈丹,程麟,冯皓,等.利用高掺量磷渣煅烧优质水泥熟料的研究[J].硅酸盐通报,2010,29(3):692-697.
[7]覃扬颂,王重华,黄小凤,等.熔融态黄磷炉渣的综合利用现状[J].化工进展,2012,31(10):2319-2323.
[8]Su Y,Li G,Xia J.Kinetics of silica precipitation from yellow phosphorus slag[J].Journal of Chemical Engineering,2009,87(4):610-613.
[9]Qing S,Wang H,Malingchuan,et al.Experimental study on direct preparation of glass-ceramics by high temperature and low phosphorus molybdenum[J].Journal of Natural Science,2009,48(2):92-94.
[10]陈德谦.水泥中外掺磷渣微粉的试验研究[J].水泥工程,2015(1):12-17.
[11]刘湛新.水工混凝土低热硅酸盐水泥复掺磷渣粉配比设计[J].科技通报,2015,28(4):111-113.