Conclusions
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1.
Adsorption surface structures of polyhydroxyl compounds of starch on apatite, calcite, and dolomite have different properties; this determines the selective flotation of apatite by carboxylic acids at pH>7.
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2.
The observed optimum flotation of calcite and dolomite by carboxylic acids as a function of the starch consumption, and the subsequent depression of flotation, may be chiefly due to the adsorbed conformation structures of the starch molecules to the strength of the hydrogen bonds with the surfaces of hydrated minerals.
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Additional information
Mining-Metallurgical Institute, Kola Branch, Academy of Sciences of the USSR. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 6, pp. 89–94, November–December, 1969.