Characterisation of Bauxite and Laterite ores in Yercaud Hill, Salem District, Tamil Nadu, India | Chapter 7 | Geography, Earth Science and Environment: Research Highlights Vol. 10

The charnockitic suite of rocks underlying the bauxite deposits of Yercaud Hill consists of quartz, plagioclase and potash feldspar, ortho and clino-pyroxenes, garnet and secondary hornblende. Bauxite consists mainly of aluminum hydroxide minerals. Bauxite occurs in Yercaud Hill as a part of the Eastern Ghats range of Tamil Nadu of the Achaean age. It is formed due to residual weathering and lateritization of Achaean charnockite. In the study area, bauxite consists of hydrous aluminum oxides, aluminum hydroxides and laterites, which are mostly found in humid tropical climatic conditions due to intense weathering of the parent rock. The XRD study shows that gibbsite (Al (OH)₃), goethite (FeO(OH)) and hematite (Fe₂O₃) are the major minerals in the bauxites. From the XRF analysis, the major oxides are Al₂O_3, Fe₂O_3, SiO₂, TiO₂, P₂O₅, and Cr₂O_3. Based on the Al₂O_3, SiO_2, Fe₂O₃ ternary plot, bauxites of this region have undergone strong lateritization. According to the chemical classification of laterites, Yercaud bauxites are categorized as Ferrite and Bauxitic Ferrite with some amounts of bauxite. At high Al₂O₃ weight percentage (86%), low Fe₂O₃ concentration (10.56%), and TiO₂ (0.49%) indicates it as a high-grade Bauxite of aluminium hydroxides mineral Gibbsite (Exploited mines-III, Semmedu). High Fe₂O₃ constitutes (77.61% by weight), low Al₂O₃  (18.22%) and 0.89 % TiO₂ portrays it as iron-rich laterite (Exploited mines – I, Manjakuttai). This geochemistry reveals the site-specific Al₂O₃ weight percentage of bauxite ore within the study area of Shevaroy Hill in Salem district.

 

Author (s) Details

 Aravindan.S
Department of Earth Sciences, Annamalai University, Annamalai Nagar – 608 002, India.

 

Sanjay Kumar Balabantaray
Department of Earth Sciences, Annamalai University, Annamalai Nagar – 608 002, India.

 

Bharathiraja. S
Department of Earth Sciences, Annamalai University, Annamalai Nagar – 608 002, India.

 

Please see the book here:- https://doi.org/10.9734/bpi/geserh/v10/5439

Trace Element Analysis of Dental Powders by X-Ray Fluorescence Technique: A Recent Study | Chapter 8 | Newest Updates in Physical Science Research Vol. 8

 The current study will focus on the experimental method, the elements that should be found in dental powder, and the findings. Medical research has shown that Hg is continuously emitted as vapour into oral air, inhaled, absorbed into body tissues, oxidised to ionic Hg, and finally covalently bonded to cell proteins throughout the last decade. Traditional XRF and hand-held XRF were used to examine dental powder (HHXRF). In XRF, the spectrum reveals a lot of Si, K, Ca, and Zr, while in HHXRF, it displays a lot of Al. The HHXRF has the advantage of revealing Al, a common element found in dental powders. HHXRF is preferable over traditional XRF for obtaining Al, which is abundant in dental powders. The current study will focus on the experimental method, the elements that should be found in dental powder, and the findings.

Author (S) Details

Dr. Daisy Joseph
Nuclear Physics Division, BARC, Mumbai, India.

View Book :- https://stm.bookpi.org/NUPSR-V8/article/view/1759