Characterization and process development of the Nile diatomaceous sediment

Al-Wakeel, Mohamed I.

doi:10.1016/j.minpro.2009.03.008

Cited by 24 publications

(9 citation statements)

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“…Diatomaceous earths form in primarily freshwater lacustrine environments and are preserved after periods of aridity or tectonic uplift (see [107][108][109]). These silica-rich sediments are frequently pure white and friable, superficially resembling chalk and are therefore attractive as white pigments, filers and substrate for organic lakes.…”

Section: Diatomite and Diatomaceous Earthsmentioning

confidence: 99%

Mineral Pigments in Archaeology: Their Analysis and the Range of Available Materials

Siddall

2018

Minerals

135

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Naturally occurring minerals or their synthetic analogues have been important as pigments used in artistic and cosmetic contexts in global antiquity. The analysis and identification of mineral pigments, though routine to the petrologist or mineralogist, also requires specialist knowledge of the archaeological contexts and available technologies and trade. This paper attempts to present an analytical approach to the study of mineral pigments in archaeology and also introduces the range of mineral pigments encountered in works of art and painted objects on archaeological sites and in museums. It attempts to cover the range of mineral and synthetic inorganic pigments used in global cultures from to the early Medieval period.

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Section: Diatomite and Diatomaceous Earthsmentioning

confidence: 99%

Mineral Pigments in Archaeology: Their Analysis and the Range of Available Materials

Siddall

2018

Minerals

135

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“…In this context, a considerable number of beneficiation techniques have been developed to remove the carbonate minerals and improve the purity of the diatomite finished products. Some methods use physical separation of ore and impurities such as sequential classification [10], electric field-based separation [11,12] and centrifugal separation [13]. These are sometimes complemented with enrichment methods such as flotation [14] and acid leaching [15,16].…”

Section: Introductionmentioning

confidence: 99%

The Use of Infrared Spectroscopy to Determine the Quality of Carbonate-Rich Diatomite Ores

Guatame-Garcia¹,

Buxton²

2018

Minerals

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Diatomite, a rock formed by the accumulation of opaline diatom frustules, is a preferred raw material for the manufacturing of filters. Its uniqueness relies on the high porosity and inertness of the frustules. The presence of carbonates in some diatomite ores hinders these properties. The purpose of this study was to identify the type of carbonates and their association with the ore in a diatomite deposit, and to assess the suitability of determining the quality of the ore using techniques with potential for in-pit implementation. For this, run-of-mine samples were analysed using environmental scanning electron microscopy (ESEM) and infrared spectroscopy. The ESEM images showed that carbonate is present as cement and laminae. The infrared data revealed that the carbonate minerals correspond to aragonite and calcite, and that their occurrence is linked to the total amount of carbonate in the sample. By using a portable spectral instrument that uses diffuse reflectance, it was possible to classify the spectra of the ore samples based on the carbonate content. These results indicate that infrared technology could be used on-site for determining the quality of the ore, thus providing relevant information to assist the optimisation of mining and beneficiation activities.

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“…After comminution, diatomite and its impurities are typically separated by use of air separators, mechanical mixing and cyclones or magnetic separators (Al-Wakeel 2009;Bentli, 2002;Mete, 1988). However, diatomite is usually treated by calcination or flux calcination methods to obtain better diatomite properties for filtration (Breese, 1994).…”

Section: Introductionmentioning

confidence: 99%