以MgCl2为晶型导向剂制备了形貌规整的文石相针状碳酸钙,其粒径为2.5～5.0μm,长径比为10～20.采用EDTA络合滴定碳化后回收滤液中Ca2+、Mg2+含量以确定需补加MgCl2量,并在相同的碳化工艺条件下逐步改进套用回收液的方法制备针状碳酸钙.产品用SEM、XRD进行形貌观察和晶型组成分析.结果表明,随着套用次数的增加,碳酸钙产品中文石相的含量逐渐降低,当文石相的含量低于80％时,针状碳酸钙的长径比也大幅下降,同时生成大量微细立方状方解石相碳酸钙,将不适合继续套用.直接套用回收液时只能循环使用1次,而将套用的回收液经补加Mg2+、加酸调节pH等优化处理后可使套用次数延长至12次,这将大幅降低针状碳酸钙的生产成本.
参考文献
| [1] | 袁建君,方琪,刘智恩.晶须的研究进展.材料科学与工程,1996,14(4):1-7. |
| [2] | 徐兆瑜.晶须的研究和应用新进展.化工技术与开发,2005,34(2):11-17. |
| [3] | 项久兴,孙秋菊,武士威,等.碳酸钙晶须的应用研究进展.精细与专用化学品,2010,18(1):27-30. |
| [4] | Hao Y J,Jin G Q,Han X D,et al.Synthesis and characterization of bamboo-like SiC nanofibers.Materials Letters,2006,60(11):1334-1337. |
| [5] | Khalsa H S,Smith M D.Crystal growth and structure determination of K2TiO3:a five coordinate titanate.Materials Research Bulletin,2009,44(1):91-94. |
| [6] | Xu C X,Sun X W.Characteristics and growth mechanism of ZnO whiskers fabricated by vapor phase transport.Japanese Journal of Applied Physics,2003,42:4949-4952. |
| [7] | Tsuzuki T,Pethick K,McCormick P G Synthesis of CaCO3 nanoparticles by mechano-chemical processing. Journal of Nanoparticle Research,2000,2(4):375-380. |
| [8] | Ahn J W,Kim J H,Park H S,et al.Synthesis of single phase aragonite precipitated calciun carbonate in Ca(OH)2-Na2CO3-NaOH reaction system.Korean J.Chem.Eng.,2005,22(6):852-856. |
| [9] | Kojima Y,Sadotomo A,Yasue T,et al.Control of crystal shape and modification of calcium carbonate prepared by precipitation form calcium hydrogencarbonate solution.Journal of Ceramic Society of Japan,1992,100(9):1145-1153. |
| [10] | 许兢,陈庆华,钱庆荣.尿素水解法制备晶须碳酸钙.结构化学,2003,22(2):233-237 |
| [11] | Hu Z,Shan M,Cai Q,et al.Synthesis of needle-like aragonite form limestone in the presence of magnesium chloride.Journal of Materials Processing Technology,2009,209(3):1607-1611. |
| [12] | Park W K,Ko S J,Lee S W,et al.Effects of magnesium chloride and organic additives on the synthesis of aragonite precipitated calcium carbonate.Journal of Crystal Growth,2008,310(10):2593-2601. |
| [13] | 马俊,刘华彦,梁锦,等.两种重要形貌的碳酸钙的可控合成及生长机理探讨材.料科学与工程学报,2011,29(2):227-232. |
| [14] | 程建国.无机及分析化学.浙江:浙江科学技术出版社,2006:186-199. |
| [15] | Bischoff J L,Fyfe W S.Catalysis,inhibition,and the calcitearagonite problem;[Part]1,The aragointe-calcite transformation.American Journal of Science,1968,266:65-79. |
| [16] | Ota Y,Inui S,Iwashita T,et al.Preparation of aragonite whiskers.Journal of the American Ceramic Society, 1995, 78(7):1983-1984 |
| [17] | 梁锦,刘华彦,陈银飞.碳化参数对纳米碳酸钙粒径与形貌的影响.无机盐工业,2009,41(12):22-24. |
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