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United States Patent Office Patented Dec 3,114,704 United States Patent Office Patented Dec. 17, 1963 2 This invention is based in part on the discovery that 3,114,704 by hydrogenating the nitrile pitch and combining the ORE FLOTATION COLLECTOR AND ORE hydrogenated pitch in certain proportions with primary FOTAEON PROCESS fatty monomaines that an ore flotation collector can be Robert S. Kaufman, Paios Heights, Robert E. Baarson, 5 produced which is of equal or greater effectiveness to the Chicago, and Harold B. Treweek, Park Forest, ii., assignors to Armour and Corinpasay, Chicago, I., a straight primary amines. Since the hydrogenated nitrile corporation of Delaware pitch may comprise as much as 40 to 60% of the col No Drawing. Filed Apr. 20, 1961, Ser. No. 104,242 lector, the cost of the collector is greatly reduced. Fur 6 Claims. (C. 299-166) thermore, when the preferred proportions are employed, O the collector will not only be of substantially lower cost, This invention relates to an ore flotation collector but it will also have improved selectivity and/or collector which has particular utility in the froth flotation of silica strength. containing phosphate ores, and therefore the invention The nitrile pitch as produced, for example, by the pro also relates to a phosphate ore flotation process. cedures described in U.S. Patent Nos. 2,314,894 and At the present time primary fatty monoamines are 5 2,808,426, will contain nitriles as the principal component widely used in the froth flotation of silica containing and Will be composed of compounds and polymers there phosphate ores. The amine flotation is commonly en from containing in excess of 22 carbon atoms. Most ployed for the final concentration of the phosphate rock, natural fats are composed predominantly of fatty acids the coarse silica having been separated in an earlier flota containing from 12 to 22 carbon atoms (C1 to Ca2), and tion stage. The amines are ordinarily used in their salt 20 when these are reacted with ammonia to produce the cor form, such as the acetate salt. The amine collector, being responding nitrile monomers the residue or pitch will strongly cationic, causes the silica to float and it is re contain a high percentage of high boiling compounds of moved in the froth or overflow. The desired product, a polyineric nature. These may include nitriles, amides, being the concentrated phosphate rock, is removed in the fatty acids, esters, etc. The exact chemical composition underflow. The phosphate concentrate thus produced 25 of all of the compounds present in nitrile pitch is virtually should contain a minimum of silica, preferably not more impossible to determine by standard analytical procedures. than 3 or 4% by weight. However, a typical polymeric nitrile pitch may contain Since amine collectors have become virtually standard from 25 to 60% nitrile, 5 to 30% amide, 1 to 10% fatty reagents in the flotation of phosphate ores, a great deal acid, 1 to 15% ester, and a variable percentage of other of research has been directed toward the improvement of 30 high boiling compounds, the percentages being on a weight such collectors. In evaluating amine collectors two basis. As indicated previously, most of the compounds factors are of major importance. These are the strength in the pitch will be of a polymeric nature, although the of the collector, which is a measure of the quantity of pitch may also contain small percentages of some mono the collector required to obtain a particular degree of meric compound including monomeric nitriles. separation, and the selectivity of the collector, which is 35 In accordance with the present invention, the nitrile a measure of the amount of the phosphate rock recovered. pitch is subjected to hydrogenation to convert a major For example, collector strengths can be evaluated in terms portion of the nitriles in the pitch to their corresponding of the pounds of collector required per ton of flotation amines. The hydrogenated pitch will therefore also be a feed to obtain a particular concentration of acid insolubles relatively high boiling material composed of compounds (a measure of silica content) in the product. Collector 40 of normal carbon chain length and compounds and poly selectivity can be determined by comparing the percent mers therefrom having more than 22 carbon atoms. This of phosphate rock recovered with the percent of insolubles is true even when the original fatty acids contain from in the product. The recovery may be stated in terms of 12 to 18 carbon atoms, as preferred, because of the avail tricalcium phosphate content which is usually designated ability of natural fats containing such fatty acids. For in the industry as bone phosphate of time (BPL). As example, the fatty acid source may be tallow, coconut oil, indicated, the siliceous gangue constituents of the phos Soybean oil, cottonseed oil, or mixtures thereof. phate rock are commonly determined and reported as acid The hydrogenation can be carried out in accordance insolubles (InSol). with Standard procedures for hydrogenating fatty nitriles One disadvantage of the amine collectors used for to produce the corresponding amines. Raney nickel may phosphate ore recovery is the relatively high cost of the 50 be used as a catalyst, the hydrogenation being carried out collectors. In addition to the desire to increase the at an elevated temperature and pressure. For example, strength of amine collectors and/or their selectivity, there temperatures of 100 to 170° C. may be used, and pressures has been a desire to find means for reducing the cost of of 100 to 300 p.s. i. Higher pressures and catalyst ratios such collectors. The way in which these and other objects may be used but to no particular advantage. For exam are achieved will be indicated in the following detailed 5 5 pie, a reactor temperature of 160° C. and a pressure of specification. 200 p.S.i. may be advantageously used. For many years fatty nitriles have been prepared com While it is not necessary to convert 100% of the nitriles mercially on a large scale by the reaction of naturally in the pitch to the amine, it will usually be desirable to occurring fatty acids with ammonia. The details of such continue the hydrogenation reaction for a sufficient time processes vary, but the basic reactions are the same. For 60 to convert at least the major portion of the nitriles. This example, the nitriles may be prepared as described in U.S. may normally be accomplished without excessive hydro Patent No. 2,314,894, or as described in U.S. Patent No. genation times. For example, the hydrogenation reaction 2,808,426. In all such processes a relatively non-volatile may be carried out in from 2 to 6 hours. It will be under residue is obtained, which is known as "nitrile pitch.” At stood that the reaction time will depend somewhat on the the present time millions of pounds per year of such nitrile 65 temperatures and pressures employed as well as the pro pitch are produced as a by-product of fatty nitrile manu portion of catalyst. The proportion of catalyst, however, facturers. Heretofore the nitrile pitch has had little can be varied considerably. Suitable proportions of commercial value, and is commonly used as a fuel by the Raney nickel range from 0.1 to 1 percent based on the nitrile manufacturers. It will be evident therefore that nitrile pitch. A proportion of 0.6% of the catalyst gives the current market price of nitrile pitch is much less than 70 good results. that of the primary fatty monoamines which are used as The hydrogenated nitrile pitch is then combined with ore flotation reagents. the primary fatty monoamine. These two components 3,114,704 3 4. should be thoroughly mixed and blended to produce a genated material is in turn combined with primary tallow uniform product. The resulting ore flotation collector amine in several different proportions to provide cationic should contain at least 5% of the hydrogenated nitrile flotation collectors differing with respect to total primary pitch on a weight basis but not over 60%. With such amine content and combining weight, as summarized formulations, the ore flotation collector would corre below. spondingly contain from 40 to 95% by weight of the primary fatty monoamine. It will be understood that the Percent Percent primary fatty monoamine is the type which has heretofore Hydrogen- Primary Reagent No. ated Alnine been used as an ore flotation collector, that is, the primary Nitrile (Analyzed amine will usually be composed essentially of amines con Pitch as Tallow) taining from 12 to 22 carbon atoms, and preferably from 10 16 to 22 carbon atoms. For achieving the maximum 60 40 45 55 benefits of the present invention, it is preferred that the 32 68 ore flotation collector contain at least 40% but not over O 00 75% by weight of the primary amine, the corresponding percentages of the nitrile pitch being from 25 to 60%. Tests were conducted with the above collectors on The ore flotation collector prepared as described in the Samples of deslimed cationic-circuit phosphate feed re foregoing specification can be used in the separation of ceived from a Florida phosphate operation. The flotation silica from phosphate rock in the same manner as the feed contained 16% acid insoluble and 66.6% BPL primary fatty monoamines would be employed. In other 20 (30.5% POs). words, all that is necessary is to subject the silica-contain For each flotaiton test, a 500 g. ore sample was con ing phosphate ore to froth flotation in the presence of the ditioned at flotation pulp density (16% solids) in a improved collector.
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