Bayer Process Impurities and Their Management

Healy, Steven J.

doi:10.1007/978-3-030-88586-1_8

Cited by 2 publications

(1 citation statement)

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“…In the second phase of this work, the purification of the aluminate solution contin in order to obtain the purest possible product (aluminum hydroxide). Sodium alumi from Phase I was further treated with very fine aluminum hydroxide (seed crystals), ing which iron, zinc, and copper ions were adsorbed on the surface of the solid ph This is an innovative step of this work, which is missing in the literature on purifica of solutions [20][21][22][23][24][25]. Seed crystals were prepared after grinding of water suspension very fine aluminum hydroxide.…”

Section: Second Step Of the Purification Processmentioning

confidence: 99%

Influence of Process Parameters in Three-Stage Purification of Aluminate Solution and Aluminum Hydroxide

Damjanovic,

Filipovic,

Obrenovic

et al. 2023

Metals

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The influence of process parameters in the three-stage purification of aluminate solution from the Bayer process and aluminum hydroxide was considered in this paper. One of the ways of purification is treating the aluminate solution in order to reduce the concentrations in the starting raw material (solution) and then treating the aluminum hydroxide at a certain temperature and time in order to obtain an alumina precursor of adequate quality. The purification process itself is divided into three phases. The first phase involves the treatment of sodium aluminate with lime in order to primarily remove Ca2+ and (SiO3)2− impurities. Phase II aims to remove impurities of Zn2+, Fe2+, and Cu2+ by treatment with controlled precipitation using specially prepared crystallization centers. In Phase III, Na+ is removed by the process of hydrothermal washing of Al2O3 ∙ 3H2O. In this work, parameters such as temperature (T), reaction time (t), and concentration of lime (c) were studied in order to remove the mentioned impurities and obtain the purest possible product that would be an adequate precursor for special types of alumina.

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