Effect of Copper II Ions on Quality of Struvite Produced in Continuous Reaction Crystallization Process at the Magnesium Ions ExcessReport as inadecuate




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The research results concerning continuous removal of phosphate V ions from solutions containing 1.0 or 0.20 mass % of phosphate V ions and 0.2 or 0.5 mg-kg of copper II ions using magnesium and ammonium ions addition are presented. Continuous reaction crystallization of struvite MgNH4PO4 × 6H2O ran both under stoichiometric conditions and at 20% excess of magnesium ions pH 9, t 900 s. It was concluded, that presence of copper II ions in a process system influenced product quality moderately advantageously. Mean size of struvite crystals enlarged by ca. 6% only. Lower concentration of phosphate V ions and excess of magnesium ions caused, that products of ca. 9% - 13% larger crystal mean size up to ca.40mm were removed from the crystallizer. Presence of struvite crystals and copper II hydroxide were detected analytically in the products Cu in a product varied from 6 to 90 mg-kg. Presence of copper II ions favored crystallization of struvite in the form of tubular crystals.

KEYWORDS

Struvite; PhosphateV Ions; Copper Ions; Continuous Reaction Crystallization; DT MSMPR Crystallizer; Crystal Size Distribution; Product Quality

Cite this paper

N. Hutnik, B. Wierzbowska, K. Piotrowski and A. Matynia -Effect of Copper II Ions on Quality of Struvite Produced in Continuous Reaction Crystallization Process at the Magnesium Ions Excess,- Advances in Chemical Engineering and Science, Vol. 3 No. 4B, 2013, pp. 1-6. doi: 10.4236-aces.2013.34B001.





Author: Nina Hutnik, Boguslawa Wierzbowska, Krzysztof Piotrowski, Andrzej Matynia

Source: http://www.scirp.org/



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