含锆二氧化硅微粉浆料的流变性  

Rheological properties of zirconia-containing micro silica slurries

作　　者：覃慧清 夏雨峰 黄青[1] 员文杰[1,2,3] QIN Huiqing;XIA Yufeng;HUANG Qing;YUAN Wenjie(State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China;National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology,Wuhan University of Science and Technology,Wuhan 430081,China;Joint International Research Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081 [2]武汉科技大学高温材料与炉衬技术国家地方联合工程研究中心,湖北武汉430081 [3]武汉科技大学钢铁工业耐火材料新技术国际合作联合实验室,湖北武汉430081

出　　处：《中国粉体技术》2024年第6期119-129,共11页China Powder Science and Technology

基　　金：国家自然科学基金项目,编号:52172023;湖北省科技创新人才计划科技服务人才专项,编号:2023DJC124。

摘　　要：【目的】充分发挥含锆二氧化硅微粉浆料在改善浇注料施工性能方面的潜力,探究分散剂对含锆二氧化硅微粉浆料的作用机制及影响因素,旨在为浇注料中含锆二氧化硅微粉原料和分散剂的选用提供依据,优化浇注料的综合性能并降低成本。【方法】采用流变仪分别测试含三聚磷酸钠(sodium tripolyphosphate,STPP)、六偏磷酸钠(sodium hexametaphosphate,SHMP)、FS20型聚羧酸盐分散剂的质量分数分别为0.2%、0.2%、0.1%的含锆二氧化硅微粉浆料的流变性能;利用灰色关联度分析方法,研究含锆二氧化硅微粉特性与浆料流变参数的关联性;结合Herschel-Bulkey模型,探究分散剂对含锆二氧化硅微粉浆料流变性的影响。【结果】在剪切速率为0.13 s^(-1)的情况下,浆料的pH和含锆二氧化硅微粉的D_(50)与含锆二氧化硅微粉浆料流变性的关联度分别是0.9753、0.9427;添加3种分散剂后,浆料均呈现剪切变稀的特性,表明所选的3种分散剂对含锆二氧化硅微粉浆料的流变性有改善效果。【结论】浆料的流变性受浆料pH、含锆二氧化硅微粉的D_(50)粒径及微粉粒径分布和表面羟基含量的共同影响,这些因素不仅决定浆料的基本流变特性,而且对分散剂的效能发挥起着重要作用;添加离子型表面活性分散剂STPP、SHMP相对于FS20型聚羧酸盐分散剂更有助于降低含锆二氧化硅微粉浆料的黏度;粒径分布范围较宽和表面羟基更多的含锆二氧化硅微粉在STPP作用下浆料的分散效果最好,pH略大的含锆二氧化硅微粉因对磷酸根的吸附受到抑制,则需要添加SHMP才能获得黏度最小的浆料。Objective Owning to their advantages,including easy production,simple construction,no need for firing,and fewer joints that can lead to lower corrosion,monolithic refractories such as castable have replaced traditional shaped refractories in most application fields.The use of a large amount of micro powders makes the dispersion of castable crucial for construction.Zirconiacontaining micro silicas,a by-product of the desilication process in zirconium production,boasts enhanced dispersibility and favorable rheological properties.These characteristics can reduce the required amount of dispersant,lower construction costs,and exhibit promising application potential.To fully utilize its potential to improve the construction and service performance of castable,the rheological properties of zirconia-containing micro silicas slurries were systematically investigated.The effects of powder characteristics and dispersant on their rheological properties were analyzed.The results can provide practical guidance for the development and utilization of castable with zirconia-containing micro silicas.Methods In this paper,three grade zirconia-containing micro silicas powders(SIF-A,B,C)produced by Imerys Fused Minerals Yingkou Co.,Ltd.were selected.The phase of zirconia in micro silicas was identified by X-ray diffraction(XRD).The microstructure of zirconia-containing micro silicas was observed using transmission electron microscopy(TEM).Functional groups of zirconia in micro silicas were identified by Fourier transform infrared spectroscopy(FTIR).The particle size distribution of micro silicas was tested by a laser particle size analyzer.A 5%mass fraction slurry was prepared and the Zeta potential of the solution was measured at different pH values.The rheology of zirconia-containing micro silicas micro powders slurries containing 0.2%sodium tripolyphosphate(STPP),0.2%sodium hexametaphosphate(SHMP),and 0.1%FS20-type polycarboxylate dispersant in mass fractions was measured using a cylindrical coaxial rotational rheometer.The shear

关 键 词：含锆二氧化硅微粉 分散剂 流变性 灰色关联度分析 Herschel-Bulkey模型 

分 类 号：TQ175.4[化学工程—硅酸盐工业] TB4[一般工业技术]