Abstract
The desiliconization reaction in sodium aluminate solution was studied by adding tricalcium hydroaluminate (C 3AH 6). C 3AH 6 prepared at 323 K has a relatively high desiliconization capacity. Kinetic results show that the desiliconization reaction is first-order in SiO 2 concentration, and the apparent activation energy is estimated to be 96 kJ/mol between 363 and 393 K, which is lower than that from adding Ca(OH) 2. During the desiliconization process, SiO 2(OH) 2 − ions enter the interior of C 3AH 6 particles and react with them further. As a result, the distribution of SiO 2 in the desiliconization product (DSP) is more uniform than that from adding CaO. Also, the SiO 2 content in DSP is higher.
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