| 摘要 |
1,264,117. Froth flotation process. ENGLISH CLAYS LOVERING POCHIN & CO. Ltd. 7 March, 1969 [11 March, 1968], No. 11856/68. Heading B2H. In a froth flotation process for purifying mineral ores, an aqueous mineral slurry containing a defluocculant and a collector and having a solids content of at least 30% by weight is conditioned for a time sufficient to dissipate in the slurry at least 25 horsepower hours of energy per ton of mineral solids and is then introduced into a froth flotation cell having a central, internal, submerged impeller having a peripheral speed of at least 2,000 feet per minute. The deflocculant may be sodium silicate, and the collector, a C 8-20 fatty acid such as oleic acid or lauric acid. Ammonium hydroxide may be added, and an activator, preferably a water-soluble salt of an alkaline earth metal or of a metal having a specific gravity greater than 4, may be used. Frothing may be induced by addition of pine oil or a lower alkyl ether of polyproylene glycol. The froth flotation cell comprises an impeller 1 mounted beneath a hood 7 and driven by belt gearing 4 from an electric motor 2. The process may be carried out in a number of similar froth flotation cells connected in series (Figure 2, not shown). |
