氯化镁-氢氧化钠复合添加剂制备文石型碳酸钙
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摘要
采用碳化法,使用氯化镁和氢氧化钠复合添加剂,制备含文石相的沉淀碳酸钙。采用X射线衍射(XRD)、透射电镜(TEM)对产物的晶型和形貌进行表征。讨论了氢氧化钠添加比例、氢氧化钙浓度以及碳化反应温度等工艺条件对实验结果的影响,并分析了过程的反应机理。结果表明:产物中的文石相来自于碳酸钙在氢氧化镁沉淀上的异相成核和生长,方解石相来自于碳酸钙在溶液中的均相成核和生长;氢氧化钠的加入降低了溶液中碳酸钙的过饱和度,抑制了均相成核过程,降低了氯化镁的添加比例。在碳化反应温度为30℃、氢氧化钙浓度为1.7~2.0 mol/L、氢氧化钠与氯化镁物质的量比为2.6条件下,对文石型碳酸钙的生成较为有利。
The aragonite calcium carbonate was synthesized with composite additive MgCl_2 and NaOH by gas-liquid carbonization method.The morphology and crystal structure of products were characterized by XRD and TEM.The effects of process conditions,such as Na OH addition ratio,Ca(OH)_2 concentration,and reaction temperature,on the experimental results were discussed and the reaction mechanism of the process was also analyzed.Results showed that the aragonite in the products was formed by heterogeneous nucleation and growth on the precipitation of Mg(OH)_2,and the calcite formed by homogeneous nucleation and growth of calcium carbonate in the solution; the addition of NaOH reduced the supersaturation of calcium carbonate in the solution,inhibited the homogeneous nucleation process and reduced the adding ratio of MgCl_2.The high content of aragonite calcium carbonate can be prepared at the conditions that the initial carbonization temperature of 30 ℃,the concentration of Ca(OH)_2 of 1.7~2.0 mol/L,and the amount-of-substance ratio of NaOH to MgCl_2 of 2.6.
The aragonite calcium carbonate was synthesized with composite additive MgCl_2 and NaOH by gas-liquid carbonization method.The morphology and crystal structure of products were characterized by XRD and TEM.The effects of process conditions,such as Na OH addition ratio,Ca(OH)_2 concentration,and reaction temperature,on the experimental results were discussed and the reaction mechanism of the process was also analyzed.Results showed that the aragonite in the products was formed by heterogeneous nucleation and growth on the precipitation of Mg(OH)_2,and the calcite formed by homogeneous nucleation and growth of calcium carbonate in the solution; the addition of NaOH reduced the supersaturation of calcium carbonate in the solution,inhibited the homogeneous nucleation process and reduced the adding ratio of MgCl_2.The high content of aragonite calcium carbonate can be prepared at the conditions that the initial carbonization temperature of 30 ℃,the concentration of Ca(OH)_2 of 1.7~2.0 mol/L,and the amount-of-substance ratio of NaOH to MgCl_2 of 2.6.
引文
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[2]徐惠,常成功,刘小育,等.一种针状纳米碳酸钙的制备方法[J].无机盐工业,2010,42(1):17-19.
[3]张利,刘兴勇,毛逢银.文石型碳酸钙晶须填充纸张性能研究[J].四川理工学院学报:自然科学版,2007,20(1):73-75.
[4]曾蓉,乔秀文,齐誉,等.超声辅助制备针状纳米活性碳酸钙的研究[J].无机盐工业,2014,46(2):21-26.
[5]汤建伟,于珊珊,刘咏,等.碳酸钙晶须表面改性研究[J].无机盐工业,2013,45(9):8-10.
[6]陈华雄,宋永才.文石晶须制备中氯化镁的影响[J].硅酸盐学报,2003,31(10):940-944.
[7]马俊,刘华彦,陈银飞.针状碳酸钙制备中氯化镁晶型导向剂的套用研究[J].无机材料学报,2011,26(11):1199-1204.
[8]孙红娟,常有军.鼓泡法制备文石型碳酸钙晶须的实验研究[J].中国矿业,2005,14(2):77-79.
[9]乃学瑛,余德成,李武,等.高长径比碳酸钙晶须的制备方法:中国,101935865[P].2011-01-05.
[10]Hu Z S,Shao M H,Li H Y,et al.Mg2+content control of aragonite whisker synthesised from calcium hydroxide and carbon dioxide in presence of magnesium chloride[J].Materials Science and Technology,2008,24(12):1438-1443.
[11]Wray J L,Daniels F.Precipitation of calcite and aragonite[J].J.Am.Chem.Soc.,1957,79(9):2031-2034.
[12]Bischoff J L,Fyfe W S.Catalysis,inhibition,and the calcite-aragonite problem.I.The aragonite-calcite transformation[J].Am.J.Sci.,1968,266:65-79.
[13]郭金伙,韩跃新.碳酸钙晶须结晶过程的研究[J].矿冶工程,1999,19(4):58-60.
[14]闵乃本.晶体生长的物理基础[M].上海:上海科学技术出版社,1982.
[15]马俊,刘华彦,粱锦,等.两种重要形貌的碳酸钙的可控合成及生长机理探讨[J].材料科学与工程学报,2011,29(2):227-232.