شناسایی و خالص‌‌سازی مونتموریلونیت از بنتونیت معدن قائن

نوع مقاله : مقالات پژوهشی

نویسندگان

1 دانشگاه فردوسی مشهد

2 دانشگاه علوم پزشکی مشهد

چکیده

مونتموریلونیت کانی غالب تشکیل‌دهنده بنتونیت است که در بسیاری از صنایع مورد استفاده قرار می‌گیرد، اما وجود ناخالصی‌های غیر از مونتموریلونیت موجب کاهش کیفیت آن می‌شود. هدف این پژوهش تعیین روشی مناسب جهت خالص‌سازی مونتموریلونیت از بنتونیت تولیدی معدن قائن بود. برای این منظور از ترکیبی از روش الک تر، استفاده از روش ته‌نشینی ذرات، سانتریفوژ و اولتراسونیک استفاده شد. کارایی روش‌ خالص‌سازی با استفاده از آنالیز پراش پرتو ایکس، تعیین اندازه ذرات، تبادل کاتیونی و نسبت شدت پیک کوارتز به مونتموریلونیت قبل و پس از خالص‌سازی تعیین شد. نتایج این مطالعه نشان داد که بکارگیری روش‌های مذکور برای تهیه ماده‌ای سرشار از مونتموریلونیت با اندازه ذرات کوچک‌تر از 2 میکرومتر مناسب است. کریستوبالیت تنها کانی بود که با وجود حذف مقدار زیادی از آن، هنوز به‌عنوان ناخالصی به همراه مونتموریلونیت باقی مانده است که احتمالا تنها راه حذف کامل آن استفاده از روش های شیمیایی است. نتیجه این پژوهش نشان داد که با استفاده از روش‌های سریع و ارزان می‌توان بنتونیت را تا حد مناسبی خالص‌سازی کرد.

کلیدواژه‌ها


عنوان مقاله [English]

Identification and Purification of Montmorillonite Mineral of Ghaen Mine Bentonite

نویسندگان [English]

  • P. Mirhoseini Moosavi 1
  • A. Astaraei 1
  • A. Karimi 1
  • Gh. Karimi 2
1 University of Mashhad
2 Mashhad University of Medical Science
چکیده [English]

Montmorillonite is the major mineral of Bentonite with many applications in industrial fields but some impurities decreases the quality of the bentonite. The main objective of this study was to investigate the suitable method for purification of Ghaen mine bentonite. A combination of methods was considered including wet sieving and sedimentation, centrifuge and ultrasound. The efficiency of purification methods was determined based on X-ray, particle size, cation exchange capacity (CEC) and ratio peak of the Quartz/Montmorillonite analysis before and after experiments. The results showed that such methods were efficient for preparing of the materials having high quantity of montmorillonite with less than 2 microns particle sizes. Cristobalite was the only mineral remained in samples, however many of particles were exempted from the samples. Cristobalite was the main impurity remained with montmorillonite. Chemical treatment is the only way for its complete removal. The results of this study revealed that by using easy, cheap and fast methods, it is possible for acceptable purification of bentonite.

کلیدواژه‌ها [English]

  • Montmorillonite
  • bentonite
  • Purification of Clay
- Akther S., Hwang J.and Lee H. 2008. Sedimentation characteristics of two commercial bentonites in aqueous suspensions. J.Clay Mineralogy. 43, 449-457.
- Albena I., Mihailova B., Tsintsov Z. and Petrov O. 2007. Structural state of microcrystalline opals: A Raman spectroscopic study. J. American Mineralogist, 92, 1325- 1333.
- Brigatti M.F., Galan E. and Theng B.K.G. 2006. Structure and mineralogy of clay minerals In: Bergaya, F., Theng, B.KG., Lagaly, G. (Eds.), Handbook of Clay Science, Elsevier, Amsterdam, pp. 743–752.
- Bhattacharyya K.G. and Gupta S.S. 2008. Immobilization of Pb (II), Cd (II) and Ni (II) ions on kaolinite montmorillonite surfaces from aqueous medium. J. Environmental Management. 87, 46–58
- Chantawong V. 2004. Adsorption of heavy metals by Montmorillonite. The joint international conference on “Sustainable Energy and Environment (SEE).Hua Hin, Thailand.
- Duman O. and Tunc S. 2009. Electrokinetic and rheological properties of Na-bentonite in some electrolyte solutions. J.Microporous and Mesoporous Materials 117, 331–338
- Earley J.W., Osthaus B.B. and Milne I.H. 1985. Purification and properties of montmorillonite. Gulf Research and Development Company, Pittsburgh, Pennsylvania. 707-724.
- Ha Thuc Ch.N, Grillet A.C., Reinert L., Ohashi F., Ha Thuc H. and Duclaux L. 2010. Separation and purification of montmorillonite and polyethylene oxide modified montmorillonite from Vietnamese bentonites. J. Applied Clay Science .49, 229–238.
- Henderson J.H., Jackson M.L. and Syers J.K. 1971. Cristobalite authigenic origin in relation to montmorillonite and quartz origin in bentonites. J.Clays and Clay Minerals, 19, 229-238.
- Holtzer M., Bobrowski A. and Grabowska B. 2011. Montmorillonite: a comparison method for its determination in foundry bentonites. J. Metalurgija. 2,119-122.
- James O.O., Adediran Mesubi M., Adekola A., Odebunmi O. and Adekeye J.I.D. 2008. Benefication and characterisation of a bentonite from north –eastern Nigeria. J. North Carolina Academy of Science, 124(4), 154–158.
- Jacqueline Arroyo L., Teppen B.J. and Boyd S. 2005. A simple method for partial purification of references clays. J.Clays and Clay Minerals, 53(5), 512-520.
- Ilieva A. and Dimov V. 2005. Montmorillonite – Cristobalite association in bentonite clays from Bulgarian deposits. Bulgarian geological society, 80-th anniversary. 71- 74.
- Inglethorpe S.D.J., Morgan D.J., Highley D.E., and Bloodworth A.J. 1993. Thchinal report WG/93/20. Mineralogy and Petrology Series. British Geological Survey. 1-115.
- Lopez-Galindo A., Viseras C. and Cerezo P. 2007. Compositional, technical and safety specifications of clays to be used as pharmaceutical and cosmetic products. J .Applied Clay Science. 36, 51–63.
- Luckham P.F. and Rossi S. 1999. The colloidal and rheological properties of bentonite suspension. J. Advances in colloidal and interface science. 82, 43-92.
- Liu X., Lu X., Qiu J., Wang Zh. and Wu P. 2012. Purification of Low Grade Ca-bentonite for Iron Ore Pellets. J.Advanced Materials Research. 454,237-241.
- Moore D.M. and Jr Reynolds R.C. 1989. Sample preparation techniques for clay minerals. pp. 179-201 In: X-ray Diffraction and the Identification and Analysis of Clay Minerals. Oxford University Press, New York.
- Muungan N. and Jessen F.W. 1962. Studies in fractionated montmorillonite suspensions. J.Clays and Clay Minerals. 11(1). 282-294.
- Ross C.S. 1958. Review of the relationship in the montmorillonite group of clay minerals. U.S. geological survey, Washington D.C. J.Clays and Clay Minerals. 7 (1), 225.229.
- Ross C.S. and Shannon E.V. 1926. The minerals of bentonites and related clays and their physical properties. The American Ceramic Society. Bull. 9, 77-96.
- Schultz Ch. and Grundl T. 2000. pH dependence on reduction rate of 4-Cl-nitrobenzene by FeII/montmorillonite systems. J. Environmental Science & Technology.34, 3641–3648.
- Shirvani M., Shariatmadari H., Kalbasi M., Nourbakhsh F. and Najafi B. 2006. Sorption of cadmium on palygorskite, sepiolite and calcite: Equilibrium and organic ligand affected kinetics. J.Colloids and Surfaces A: Physicochem. Eng. 287, 182–190.
- Srinivasan R. 2011. Advances in application of natural clay and its composites in removal of biological, organic, and inorganic contaminants from drinking water. J. Advances in Materials Science and Engineering. 1-17.
- Klute A. 1986. Methods of soil analysis. Part 1- physical and mineralogical methods.1- 1173. Madison, Wisconsin USA.
- Wei L., Zitian F. and Xueting H. 2009. Performance characteristics of EZhoubentonite of Hubei province and its modification. China foundry .6 (4), 308-313.
- Adamis Z. and Williams R.B. 2005. Bentonite, kaolin, and selected clay minerals. Environmental Health Criteria. World Health Organization Library, Vol. 231. Cataloguing-in-Publication Data, Geneve.