Abstract

The authors have studied the reactions between ions of various collectors and the constituent ions of salttype minerals such as bastnaesite, apatite, fluorite, barite, rhodochrosite. The collectors used were sodium oleate (NaOl), n-oleoylsarcosine (OLSA), sodium octadecylsulfosuccinamate (SOSS), n-tallow-1, 3-diaminopropane dioleate (TDO), sodium dodecylsulfate (SDS) and dodecylammonium acetate (DAA).Precipitate formation was monitored using a nephelometer. The solubility products of the precipitates of metal ions with SDS, NaOl and OLSA were determined by utilizing the Debye-Huckel law. The minimum concentrations of metal ions and anions needed to form precipitates with SOSS, TDO and DAA were measured. SOSS, OLSA, TDO and SDS preferentially reacted with Ce, La and Ba ions compared with Ca and Mn ions. Selective flotation of salt-type minerals with non-fatty acid type collector was discussed on the basis of the precipitate formation test results.DAA and TDO formed precipitate of tungstate, sulfate, phosphate and carbonate but did not form with fluoride ions even at a high concentration. The adsorption mechanisms of SDS and DAA on typical salt-type minerals were interpreted in terms of the stability of the precipitates.

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