Abstract
The efficiency of silicon removal technology by acid leaching and flocculation during zirconium oxychloride octahydrate (ZrOCl2⋅8H2O) production has been improved. The optimum conditions of acid leaching were found to be as follows: transiton material, 300g; HCl (6mol/L), 600mL; leaching time, 4h; and leaching temperature, 100°C. The nonionic polyoxyethylene lauryl ether (AEO9) was adopted as the flocculant. The optimum flocculation conditions were found to be as follows: temperature, 40°C; flocculant amount, 10ml (concentration 1%); time, 1h. The zirconium oxychloride solution after purification contained 36ppm SiO2 and 160g/L ZrOCl2. The polymerization and flocculation mechanisms of silicic acid were analyzed. Results of Fourier-transform infrared, scanning electron microscopy, nuclear magnetic resonance, and Brunauer–Emmett–Teller analyses showed the main transformation and properties of the products in the acid leaching and flocculation processes.
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