Abstract
Titrations and surface tension measurements were carried out to investigate the chemical properties of n-tallow-1, 3-diaminopropane dioleate (TDO). Flotation tests with TDO were conducted using a special apparatus and method developed to simulate real flotation in the mixed minerals system of fluorite, barite, calcite, bastnaesite and monazite.TDO preferentially reacted with La ions compared with Ca ions. Surface tension of TDO aqueous solution was low in the range of pH 5-10, where TDO is present as ampho-ion. High flotation recovery of all minerals was obtained in the same pH range. The flotation behavior in the mixed minerals system was similar to that in the singular mineral systems, because TDO did not easily react with main ions such as Ca ions in the flotation pulp. When TDO addition and pH were optimum, selective flotation was performed without modifiers.
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