摘要
以磷石膏制备高纯度碳酸钙工艺研究为基础,在碳酸化过程中添加柠檬酸、乙醇、硫酸和氢氧化镁作为晶型控制剂,研究晶型控制剂对最终产物的影响。利用XRD、FT-IR和SEM对不同产物进行表征分析,实验结果表明:柠檬酸和乙醇可以起到分散剂的作用,柠檬酸也可以促进球霰石相碳酸钙向方解石相碳酸钙的转化,乙醇和硫酸可以有效阻止球霰石相碳酸钙向方解石相碳酸钙的转变,氢氧化镁可以控制文石相碳酸钙的生成,另外硫酸和氢氧化镁还可以起到控制碳酸钙晶体形貌的作用。
Based on the process study of producing high quality CaCO3 by phosphogypsum, citric acid, ethanol, sulfuric acid and magnesium hydroxide as crystalline controller were added in the carbonation process, study effect of crystalline controller on the end products. Use XRD, FT-IR and SEM to characterization the different products, the experiment results indicate that： citric acid and ethanol play a part of dispersant, citric acid also could be promoted vaterite transformed into calcite, ethanol and sulfuric acid could be affective in stopping vaterite transformed into calcite, magnesium hydroxide could control generate of aragonite, moreover, sulfuric acid and magnesium hydroxide have effect on the control of morphology of CaCOa crystal.
基金
国家863计划项目(2011AA06A106)
国家自然科学基金(21176108)
关键词
磷石膏
碳酸钙
晶型控制剂
phosphogypsum, calcium carbonate, crystalline controller
