磷石膏制备硫酸钙晶须及晶须造纸应用的研究进展

Preparation of calcium sulfate whisker from phosphogypsum and its application

简述了硫酸钙晶须的性质及晶须生长机理,介绍了硫酸钙晶须的两种常用制备方法——水热法和常压酸化法,分析了水热法工艺条件对晶须生长的影响。重点探讨了磷石膏预处理方式及其对晶须形貌的影响,对硫酸钙晶须制备与改性添加剂及其作用机理做了全面阐述。详细介绍了硫酸钙晶须应用于造纸的研究情况,并对晶须溶解、与纸纤维相容性、白度和强度的提高等硫酸钙晶须应用于造纸工业的突出问题做了重点分析。最后,指出磷石膏的选择性预处理、晶须制备与改性添加剂、工艺条件对晶须性能的影响以及晶须性能与纸张性能的定量关系是今后的主要研究方向。

The performance characteristics and growth mechanism of CSW were reviewed in this paper.The preparation methods of CSW,hydrothermal synthesis and atmospheric acidification method were also introduced,especially the influence of preparation process on the growth of CSW by hydrothermal synthesis was detailed.The pretreatment method of phosphogypusm and its effect on the morphology of CSW were summarized.Also,the additives for the preparation and modification of CSW were investigated,as well as the functional mechanism.The application of CSW in paper making was introduced.The key issues in paper making,including the solubility of CSW,the compatibility between CSW and paper fibers and the improvement of CSW whiteness and strength,were analyzed emphatically.The main development trend in the future should be the research on pretreatment technology of phosphogypsum,the additives of CSW,and the influence of preparation process on the performance of CSW,and the quantitative relationships between the performances of CSW and papers.