Decrease of Heat Consumption at Nepheline Processing to Alumina and By‐Products

Kazakov, Vladimir G.; Lipin, Vadim A.

doi:10.1002/9781118359259.ch31

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“…The main stages in alumina production from nepheline syenite are grinding of the ore and limestone, sintering of the ground material, dissolution of the sintered materials, desilication, carbonisation, precipitation of aluminate solution, and calcination of aluminum hydroxide (Al(OH) 3 ) (Smirnov 1996; Kazakov and Lipin 2012). Carbon dioxide from the sintering stage is injected into the alkali aluminate solution in the carbonisation stage leading to aluminum hydroxide precipitation.…”

Section: Introductionmentioning

confidence: 99%

Production and characterisation of sodium and potassium carbonate salts from carbonation alkaline aluminate liquor

Barakan

Ayaluey

Shayanfar

et al. 2021

Mineral Processing and Extractive Metallurgy

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The polythermal crystallization method has been used to extract sodium and potassium carbonate salts as valuable by-products. The salt production was carried out using an alkaline carbonate solution from the Azarshar nepheline syenite pilot plant in Iran. The optimum conditions were obtained by comparison between the results of thermodynamic modelling and experiments. To better understand the properties of the carbonate salts, thermal analysis, chemical analysis, and X-ray diffraction methods were also utilised. The optimum density and temperature for sodium carbonate crystallization were found to be 1.50 g/cm 3 and 115-120°C, respectively, and for hydrated potassium carbonate crystallization to be 1.68 g/cm 3 and 130°C at the first stage, and 1.70 g/cm 3 and 135°C at the second stage, respectively. The thermodynamic modelling showed good agreement with experimental data for the carbonate salts.

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Section: Introductionmentioning

confidence: 99%