Some effects of chromium (III) on the crystallization of potassium sulphate
1986; Elsevier BV; Volume: 79; Issue: 1-3 Linguagem: Inglês
10.1016/0022-0248(86)90534-8
ISSN1873-5002
AutoresZheng Dao-bong J. Budz, Alan G. Jones, J.W. Mullin,
Tópico(s)Minerals Flotation and Separation Techniques
ResumoSignificant effects of traces (up to 10 ppm) of chromium(III) on crystal growth and nucleation kinetics, crystal habit and attrition of potassium sulphate are reported. Heterogeneous nucleation is reduced by the presence of Cr(III) and crystal habit is also modified, in some cases substantially. The action of Cr(III) is strongly affected by solution pH and the presence of Cl−. With both impurities present in neutral solutions both growth and secondary nucleation rates pass through a maximum prior to inhibition. Cl− enhances the effect of Cr(III) on micro-attrition during stirring but has a moderating effect on macro-attrition in well-agitated slurries. These characteristics are assessed in terms of the interaction between the formation of chromium aqua- and chloro-complex ions, solution pH and the mechanism of crystallization process.
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