Akzo Nobel Chemicals International B.v.

Christina Josefin Lannefors

Jan Olof Gustafsson

The present invention relates to the use of a polyquaternary polymer obtainable by reacting i) a dialkylamine having the structure RRNH, where Rand Rindependently are hydrocarbyl groups having 1-3 carbon atoms; ii) a difunctional compound selected from the group consisting of epihalohydrins, diepoxides, precursors of epihalohydrins and epoxides which under alkaline conditions are readily converted into the corresponding epoxy compounds, and mixtures thereof; and iii) optionally a polyfunctional amine selected from the group consisting of ammonia, primary amines, alkylenediamines having 2-6 carbon atoms, and polyalkylenepolyamines having the structure HN&#x2014;[R&#x2014;N(R)]&#x2014;R&#x2014;NH, where y is an integer from 1 to 5, Ris an alkylene radical having 2 to 6 carbon atoms, and Ris selected from the group consisting of hydrogen, a hydrocarbyl group having 1-3 carbon atoms, and an &#x3c9;-aminoalkyl group having 2 to 6 carbon atoms; as a depressant in a method for froth flotation of potash ores.

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Göteborg, Sweden

Christina Josefin Lannefors