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In the low temperature digestion of gibbsitic aluminium ores an iron content impurity phase, ‘desilication product’ (DSP), will be separated from the sodium aluminate liquor. Due to its main component: (hydroxy- or carbonate-) sodalite (SOD) and amount, reaching 7–10% of the feedstock, the DSP is an important raw material for synthesising various zeolites. Applying the sol–gel technique the authors...
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