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MINERALOGICAL AND CHEMICAL STUDY OF THE HYDRARGYLLITIC BAUXITE AND OF THE RED MUD RESULTED AS BY-PRODUCT FOR ITS REVALUATION

Mihai Ghita

First published: 2011-06-20https://doi.org/10.5593/sgem2011/s04.115View metrics

Abstract

The bauxite is not processed through the usua l processes of ore en richment because of the mineralogical composition and structure, the intergrowths of minerals being very fine. Mineralogical characterization is very important to choose the method of extracting alumina from bauxite. This paper presents the mineralogical st udy of a hydrargyllitic bauxite from Sierra Leone and of the red mud resulted after extraction of alumina by Bayer method. The mineralogical characterization of red mud is needed to choose the method of neutralization of red mud dumps and recovery of by-products. The present study was made by chemical and physical methods - X-ray diffraction, differential scanning calorimetry and opti cal microscopy in polarized light. The physico-chemical characterization was performed in th e National Institute of Research and Development for Non-ferrous and Rare Metals.

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Publication details

Title
MINERALOGICAL AND CHEMICAL STUDY OF THE HYDRARGYLLITIC BAUXITE AND OF THE RED MUD RESULTED AS BY-PRODUCT FOR ITS REVALUATION
Authors
Mihai Ghita
Proceedings
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; SGEM2011 11th International Multidisciplinary Scientific GeoConference
Publisher
Stef92 Technology
Year
2011
Pages
Not available yet
ISSN
1314-2704
ISBN
Not available yet
Language
en
Publication type
Conference Paper
Keywords
red mudbauxiteBayer process
References9

  1. Meyer F. M. Availability of Bauxite Reserves, Natural Resources Research, Vol. 13, No. 3, 2004;

  2. Gruder, G. A. Alumin iul, de la materie prim ă la produse finite, Editura Tehnica, Bucuresti, Romania, 2000.

  3. Ră dulescu D., Anastasiu N. Petrologia ro cilor sedimentare, Ed. Didactica si Pedagogica, Bucuresti, Romania, 1979.

  4. Todor D, Analiza termica a mineralelor, Ed. Tehnica, Bucuresti, Romania, 1972

  5. http://www.slminerals.org DRX REFERE1CES

  6. ICDD database, Powder Diffraction File, edited by International Centre for Diffraction Data 2006.

  7. National Institute of Standards & Technology: Certificate of Analysis, Standard Reference Material 1976, Instrument Sensitivity Standard for X-Ray Powder Diffraction

  8. V. E. Buhrke, R. Jenkins, D.K. Smith: A Practical Guide for the Preparation of Specimens for X-Ray Fluorescence and X-Ray Diffraction Analysis, John Wiley & Sons, 1998

  9. Bruker AXS GMBH: DIFFRAC plus BASIC Evaluation Package EVA12, Release 2006, User’s Manual, Sept. 6, 2006, Karlsruhe, Germany

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