| 摘要 |
<p>1343957 Froth flotation PIERREFITTEAUBY 30 April 1971 [8 May 1970] 12424/71 Heading B2H Niobium oxide ores, e.g. pyrochlore, microlite or perowskite, containing slimes are enriched by converting the ground ore to an aqueous pulp, and subjecting the pulp to froth flotation after the addition of a froth generating substance and a flotation collector for fixing the ore particles rich in niobium to the froth, the flotation collector consisting of at least one aliphatic polyamine having the general formula R-[NH-(CH 2 ) p ] n -NH 2 , where n is greater than 1, p is from 2 to 6 and R is a hydrocarbon radical having from 8 to 22 carbon atoms. A gangue depressing agent may be added to the pulp. Polyamines specified as collectors are N-alkyl-dipropylenetriamine and N-alkyl-tripropylene-tetramine and mixtures thereof. To facilitate their dispersion or solution in water, the polyamines may be at least partially treated with hydrochloric acid to form an amine salt or with a solvent. Examples are given.</p> |
