Continuous reaction crystallization of struvite in presence of iron(III) ions
Journal Title: CHEMIK nauka-technika-rynek - Year 2010, Vol 64, Issue 12
Abstract
The experimental results concerning continuous reaction crystallization of struvite from water solutions containing 1.0 mass % of phosphate(V) and iron(III) ions with magnesium and ammonium ions in stoichiometric conditions are presented. Depending on foreign ion concentration (1 ÷ 10 mg Fe3+ /kg of solution), pH (9 ÷ 11) and mean residence time of suspension in crystallizer (900 ÷ 3600 s) the crystal products of mean crystal size from 20 to 43 μm were obtained. It was proved that iron(III) ions affect struvite crystal sizes (Lm ca. 36 → 26 μm) and their population homogeneity (CV = 71 → 97%) disadvantageously. The iron(III) hydroxide particles co–precipitated with struvite crystals, usually of size below 1 μm, formed agglomerates – also on the parent struvite crystal surfaces. Presence of iron(III) ions contributes struvite crystallization in characteristic tubular–shape form.
Authors and Affiliations
Nina Hutnik, Andrzej Matynia, Bogusława Wierzbowska
Keywords
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