مطالعه تجربی روش‌های شیمیائی حذف آلاینده‌ها در فرآیند بایر

مهندسی متالورژی و مواد

مقاله 4، دوره 28، شماره 2 - شماره پیاپی 16، شهریور 1396، صفحه 49-62   

نوع مقاله: علمی و پژوهشی

شناسه دیجیتال (DOI): 10.22067/ma.v28i2.38395

نویسندگان

مصطفی محمودیان¹؛ احد قائمی^{* 2}؛ شاهرخ شاه حسینی²

¹دانشگاه آزاد شاهرود

²دانشگاه علم و صنعت ایران

چکیده

در این تحقیق عوامل موثر در ایجاد آلاینده‌های کربنات و اگزالات در فرآیند بایر مجتمع آلومینای جاجرم تعیین شده است. در حذف شیمیایی کربنات و اگزالات سدیم محلول در لیکور آلومینات سدیم به طور جداگانه از آلومینات باریم با ساختارهای Ba2Al2O5، Ba2Al4(OH)16 و BaAl2O4، آلومینات کلسیم (Ca3Al2(OH)12) و فسفات سدیم (Na3PO4) و آهک استفاده گردید. بررسی اثر دما، غلظت سود کاستیک، آلومینا و کربنات سدیم نشان داد، استفاده از آلومینات باریم با ساختار Ba2Al4(OH)16 با راندمان 2/80 % حذف کربنات و استفاده از فسفات سدیم و آهک با راندمان 1/56% در حذف اگزالات بیشترین راندمان را دارا می‌باشند. نتایج همچنین نشان دادند 9/66% کربنات ورودی از آهک بوده و بوکسیت نیز عامل 9/99% از اگزالات سیکل بایر می‌باشد.

کلیدواژه‌ها

فرآیند بایر؛ کربنات؛ اگزالات؛ آلاینده؛ روش شیمیائی

سایر فایل های مرتبط با مقاله

5-ghaemi_AK_EDITS.pdf

مراجع

1. Sonthalia R., Behara P., Kumaresan T., Thakre S., "Review on alumina trihydrate precipitation mechanisms and effect of Bayer impurities on hydrate particle growth rate", Journal of Colloids and Surfaces, Vol. 125, pp. 137–148, (2013).

2. Hind A.R., Bhargava S.K., Grocott S.C., "The surface chemistry of Bayer process solids", Journal of Colloids and Surfaces, Vol. 146, pp. 1-3, (1999).

3. Shin H.J., Lee S.O., Kim S.J., Tran T., Kim M.J., "Study on the effect of humate and its removal on the precipitation of aluminum trihydroxide from the Bayer process", Journal of Minerals Engineering, Vol. 13, pp. 387–391, (2004).

4. Xiao J.B., Jiang X.Y., Chen X.Q., "Identification of Organic Acids in Bayer Liquors By GC–MS: A Comparison Using Butylation and Methylation", Journal of Chromatographic Science, Vol. 183, pp. 183-188, (2007).

5. Armstrong L., Hunter J., McCormick K., Warren H., "Bound Soda Incorporation during Hydrate Precipitation", 14th International Symposium on Industrial Crystallization, pp. 283–292, (1993).

6. Technoexport P., "Alumina plant jajarm process and operating manual", (1997).

7. Zhang Y.F., Cao S.T., Zhang Y., Zheng S.L., "A method to produce alumina from Chinese diasporic bauxite", China patent, Appl. No. 200810227930.5, (2008).

8. Power G., Loh J., "Organic compounds in the processing of lateritic bauxites to alumina: Part 1: Origins and chemistry of organics in the Bayer", Journal of Hydrometallurgy, Vol. 105, pp. 1–29, (2010).

9. McSweeney N.J., Tilbury A.L., Nyeboer H.J., McKinnon A.J., Sutton D.C., Franzmann P.D., Kaksonen A.H., "Molecular characterization of the microbial community of a full-scale bioreactor treating Bayer liquor organic waste", Minerals Engineering, Vol. 24, pp. 1094–1099, (2011).

10. Machold T., Macedi E., Laird D.W., May P.M., Hefter G.T., "Decomposition of Bayer process organics: Low-molecular-weight carboxylates", Journal of Hydrometallurgy, Vol. 99, pp. 51-57, (2008).

11. Whelan T.J., Ellis A.V., Kannangara G.S.K., Marshall C.P., Smeulders D.E., Wilson M.A., "Macromolecules in the Bayer process", Reviews in Chemical Engineering, Vol. 19, pp. 431– 471, (2003a).

12. Ellis A.V., Wilson M.A., Kannangara K., "Bayer poisons: degradation of angiosperm and gymnosperm water-soluble extracts in sodium hydroxide at 145°C", Industrial Engineering Chemistry Research, Vol. 41, pp. 2842–2852, (2002b).

13. Power G., Loh J., "Organic compounds in the processing of lateritic bauxites to alumina. Part 1: Origins and chemistry of organics in the Bayer process", Journal of Hydrometallurgy, Vol. 105, pp. 1–29, (2010)

14. Machold T., Laird D.W., Rowen C.C., May P.M., Hefter G.T., "Decomposition of Bayer process organics: Phenolates, polyalcohols, and additional carboxylates", Journal of Hydrometallurgy, Vol. 107, pp. 68-73, (2011).

15. Power G., Loh J., "Organic compounds in the processing of lateritic bauxites to alumina", Journal of Hydrometallurgy, Vol. 127, pp. 125-149, (2012).

16. Cao S., Zhang Y., Zhang Y., "Preparation of sodium aluminate from the leach liquor of diasporic bauxite in concentrated NaOH solution", Journal of Hydrometallurgy, Vol. 98, pp 298-303, (2009).

17. The P.J., "The effect of glucoisosaccharinate on the Bayer process of alumina trihydrate", Light Metals, pp. 122–131, (1980).

18. Gerais S., "Organic control technologies in bayer process", Alcan Bayer company report, (2004).

19. Atkins P., Grocott S.C., "Impact of organic impurities on the product of refined alumina", Proceedings of Science, Technology and Utilisation of Humic Acids, CSIRO Division of Coal and Energy Technology, Sydney, Australia. pp. 85–94, (1988).

20. Power G., Loh J.S.C., Vernon C., "Organic compounds in the processing of lateritic bauxites to alumina Part 2: Effects of organics in the Bayer process", Journal of Hydrometallurgy, Vol. 127, pp. 125-149, (2012).

21. Jones F., Farrow J.B., Bronswijk W.V., "Effect of caustic and carbonate on the flocculation of hematite in synthetic Bayer liquors”, Colloids and Surfaces A: Physicochemical and engineering aspects, Vol. , pp. 65-73, (1998).

22. Strominger M.G., Malito J.T., "Purification of Bayer process liquors using cationic polymeric quaternary ammonium salts", United States Patent, Patent No: US5284634 A, (1994).

23. Power G., Tichbon W., "Sodium Oxalate in the Bayer Process: Its Origin and Effects", 2nd International Alumina Quality Workshop. Perth. Australia, pp. 99–115, (1990).

24. Loh J., Brodie G., Power G., Vernon C., "Mechanisms of Degradation of Hydrate Yield Inhibitors by Wet Oxidation", Proceedings of the 8th International Alumina Quality Workshop, Darwin, Australia, pp. 199–205, (2008a).

25. Brady J.P., "An examination of the applicability of hydrotalcite for removing oxalates anions from Bayer process solutions", (2011).

26. Grocott S.C., Rosenberg S.P., "Possible mechanisms for soda incorporation in smelter grade alumina", 1st International Alumina Quality Workshop, pp. 271–287, (1988).

27. Dong J., Loh J.S.C., Tardio J., Vernon C., Bhargava S., "Fundamentals of wet oxidation of bayer liquor organics: Effect of oxygen on malonates", Engineering a Better World: Sydney Hilton Hotel, NSW, Australia, 18-21, (2011).

28. Smith T, "Practical thermometric titrimetry", Metrohm Ltd. CH-9101 Herisau/Switzerland, (2006).

29. Standard Test Methods for Chemical Analysis of Limestone, Quicklime, and Hydrated Lime, Active Standard ASTM C25 Developed by Subcommittee: C07.05, Book of Standards Volume: 04.01

30. Greg P., Joanne S.C, Lohb, Chris V., "Organic compounds in the processing of lateritic bauxites to alumina", Journal of Hydrometallurgy, Vol. , pp. , (2012).

31. Technoexport P., "Alumina plant jajarm process and operating manual", (1997.(

32. Palmer S.J., Smith M., Frost R.L., "Implication of calcium hydroxide in the seawater neutralisation of bauxite refinery liquors", (2012).

33. Dunstan G., Charmaine R., Riley G.W., "Method for the causticization of bayer process solutions", PCT, International publication number: WO 2006/081626-A1,)2006.(