Some chemical aspects of bauxite genesis in Jamaica Glenn C. Waterman. Glenn C. Waterman Search for other works by this author on: GSW. Google Scholar. Author and Article Information ... Evidence is presented that the bauxite is not a residue of limestone erosion. Rather, the bauxite is the product of desilication of airborne volcanic material ...

This study examines bauxite residue neutralisation via several methods. Reduction in leachate alkalinity is less for carbonation than other methods. Aluminium leachate concentration is higher for acid compared to Ca/Mg treatment. Aspects of implementing bauxite residue neutralisation are discussed. Introduction

The typical features of bauxites are analyzed from a variety of aspects and results from different bauxite regions are compared. Other chapters consider the feature of metamorphosed karst bauxites.

biological survey of a typical bauxite ore body was also carried out to identify the indigenous flora and fauna inhab­ iting the mines and also to understand the role of various microorganisms in the natural formation, conversion and sedimentation ofvarious mineral forms. Materials and methods Characterization of bauxite ore. Bauxite ore samples

Bauxite minerals (gypsum, Al2O3.3H2O; boehmite, Al2O3.H2O; diaspore, Al2O3.H2O) are formed by various geological conditions and geometric configurations. In general, they …

Particulates released during processing that are known to compromise air quality include combustion byproducts, caustic aerosols, dust from bauxite, limestone, charred lime, alumina and sodium salt. …

Bauxites are residually enriched rocks, mostly composed of Al-hydroxides (gibbsite, boehmite and diaspore), kaolinite, Fe-oxy-hydroxides and Ti-oxides, which form from …

Rather, the bauxite is the product of desilication of airborne volcanic material laid down rapidly across an area marked by well-developed karst topography and abundant rainfall. This content is PDF only. Please click on the PDF icon to access. First Page Preview

From the aspect of their chemical and mineralogical composition, bauxites are very complex multicomponent raw materials. The paper presents the characterization of bauxite from several...

The DELTA analyzer, with SDD technology, now enables the determination of ALL important phases of Bauxite ores. Aluminum content can be accurately and precisely determined over a broad analytical range …

Bauxite refineries are classified as either low temperature (~ 150°C) for processing predominantly THA gibbsite bauxite or high temperature (> 240°C) for bauxite with > 6% boehmite or diaspore MHA. Boehmite requires > 240°C for digestion. Diaspore requires the highest temperatures of all, 260–280°C.

Bauxite signatures cover a wide range of values that allows selection of the most favorable bauxite prospects for future mining, both in economic as well as environmental terms.

April 2022 This Guidance explores and explains the sustainable management of bauxite residue. Bauxite residue – also known as 'red mud' – is produced when extracting …

Bauxite is the principal ore of alumina (Al 2 O 3), which is used to produce aluminum (Al). It is composed of hydrated aluminum oxides, hydrated aluminosilicates, iron oxides, hydrated iron oxides, titanium oxide, and silica. ... The microbiological aspects of water quality management are important at alumina refineries, where potable water may ...

On July 17, 1887, the Imperial Patent Office of Germany issued patent number 43977 "Verfahren zur Darstellung von Thonerdehydrat und Alkalialuminat". 1 Shortly after, he discovered that the required NaAl (OH) 4 solution could be prepared by heating bauxite under pressure in concentrated caustic soda (NaOH) solution, a process that he …

Bauxite is a rock formed from a reddish clay material called laterite soil and is most commonly found in tropical or subtropical regions. Bauxite is primarily comprised of aluminum oxide compounds (alumina), silica, iron oxides and titanium dioxide. Approximately 70 percent of the world's bauxite production is refined through the Bayer ...

A number of emergency pollution management measures were enacted after the accidental release of caustic bauxite processing residue that occurred in Ajka, western Hungary in October, 2010. These centred on acid and gypsum dosing to reduce pH and minimise mobility of oxyanion contaminants mobile at high pH.

Bauxites vary physically according to the origin and geologic history of their deposits: some deposits are soft, easily crushed, and structureless; some are hard, dense, and pisolitic, or pealike; still others …

ENVIRONMENTAL ASPECTS OF BAUXITE AND ALUMINIUM PRODUCTION IN INDONESIA A country case study prepared by the UNCTAD secretariat GE.94-50875 III CONTENTS 2.2 Institutional framework 67 2.3 Environmental impact assessment legislation and practice 72 V. ASSESSMENT OF POLICIES AND ENVIRONMENTAL PRACTICES …

Bauxite minerals (gypsum, Al 2 O 3 .3H 2 O; boehmite, Al 2 O 3 .H 2 O; diaspore, Al 2 O 3 .H 2 O) are formed by various geological conditions and geometric configurations. In general, they are observed as residual deposits of weathering products formed on or close to the surface of the earth under tropical or subtropical weathering conditions.

Abstract. The Bakhuis Mountains, consisting mostly of high-grade metamorphic Precambrian rocks, are partly covered with laterite and bauxite. The bauxite occurs on the relatively narrow plateaux ...

Bauxites are traditionally considered to form via intense chemical weathering in hot and humid zones 1. Bauxite deposits formed on paleokarstic surfaces of carbonates are identified with the...

A microbial survey of Jamnagar bauxite mines in Gujarat, India, revealed the indigenous presence of a variety of autotrophic and heterotrophic bacteria and fungi associated with the ore body and water ponds in the vicinity. Among these, bacteria belonging to the genera Thiobacillus, Bacillus and Pseudomonas are implicated in the …

The main environmental problems associated with bauxite mining are related to the rehabilitation of mined-out areas and the disposal of tailings. Emissions of dust …

bauxite, rock largely composed of a mixture of hydrous aluminum oxides. Bauxite is the principal ore of aluminum . Bauxites …

Six éléments principaux composent chimiquement les bauxites : l'aluminium, le fer, le silicium, le titane, l'oxygène et l' hydrogène (tabl. 2). Les autres éléments décelés, …

The impact of the mining activities can be quantified throug h Impact Assessment Studies within the impact zo ne. The findings of Impact Assessment studies help in prepa ration of the environmental...

Bauxite is the primary ore of aluminum. Almost all of the aluminum that has ever been produced has been extracted from bauxite. The United States has a few small bauxite deposits but at least 99% of the bauxite used in …

bauxite, rock largely composed of a mixture of hydrous aluminum oxides. Bauxite is the principal ore of aluminum. Bauxites vary physically according to the origin and geologic history of their deposits: …

Bauxite is the major alumina (Al 2 O 3) bearing ore used in the aluminum manufacturing industries.The bauxite containing less than 50% Al 2 O 3 is called low-grade bauxite ore which is commonly used for the alumina -based abrasives and refractories productions. The alumina -silica and alumina -ferrite complexes are the foremost …