Патент USA US2412500код для вставки
2,412,500 Patented Dec. 10, 1946 ‘ Fao'rn STATES rfLora'ngiiz'?g'osutrmns PATENT once orriics ' ‘I . Arthur H. Fischer, New York, N. Y. No Drawing. I ‘Application April 21, 1944, Serial N0. 5.2305 6' Claims. (or. 209-106) 1: . , Among the compounds found to be most e?ecr' tiveare those comprising on the xanthogen side This invention-relates to th concentration of ores-and has for an object the provision of vcertain alkyl radicals containing-?ve or morecarbon atoms and comprising on the formate side the. improvements’ in concentration operations. More particularly, the invention contemplates the pro vision Qfrcertain improvements ‘in ?otation op erations; ' ethyl radical. Bpecii'ic compounds whlchhave been foundto be highly effective include amyl; xanthogen ethyl formate and hexyl xanthogen; A further object of the invention is to provide certain improvements in ?otation ethyl formate. V . , V In practicing a method or process of the in The invention is based on my discovery that vention, a neutral, acid or alkaline circuit may 10 alkyi xanthogen formates which are unsymmetri be employed. The ?otation reagents may be em methods or processes. ' I calwithrespect to the alkyl radicals are‘ highly played with particular advantage in alkaline .cir e?ective ?otation reagents which may be em ployed advantageously . as cults. mineral collecting . minerals and metallic minerals and in froth ?ota tion operations designed for the concentration .' of both oxidized ores and sulphide ores. posed on the xanthogen side as indicated by the I 20 following structural formula: ‘ s . signed for the concentration of both non-metallic _Ali<yl- xanthogen/ fcrmates found most suitable for-use in ?otation concentration processes ‘are those in which the larger alkyl radicals are dis J The ?otation reagents may be employed ad vantageously in froth ?otation operations‘ de agents in" conjunction with frothing agents and conditioning agents in froth ?otation operations. The. reagents can be employed with partlcularladvan tage in froth'?otation operations‘ designed for the concentration of_ copper sulphide ores and o nodes-lion’ other sulphide ores. ‘ ' The following examples vlllustratetthe advan tages of, the reagents andprocesses of the inven- > in which R and R.’ are alkyl radicals and R con 25 tion over reagents and processes employed here tains the greater number‘of carbon atoms. tofore. I have found that the alkyl xanthogen f ormates Example I which are unsymmetrical with respect to the alkyl radicals may be employed more advan 30 Humbolt copper sulphide ore of the following tageously in various ?otation circuits than those which are symmetrical. Thus, for example, a symmetrical compound comprising relatively small alkyl radicals, such as ethyl xanthogen ethyl formate, tends to break down and become ineffective in an alkaline circuit. Compounds having larger alkyl radicals substituted for or composition with respect to copper was ground in water to form three separate aqueous pulps ‘which were subjected to separate froth ?ota tion operations in the presence of the reagents indicated with the production of concentrates and tailing products of the analyses indicated: instead of one or both of the ethyl radicals have greater stability in alkaline circuits. A com Test No. pound having the same larger radical substituted 40 for or instead of the ethyl radicals on both the xanthogen side and the formats side may be of such stability as to be practically ineffective as a ?otation agent. A compound having a larger radical on only the xanthogen side has desired stability without decreased ?otative properties. 1 2 Heads percent Cu ...................... .. 1.86 Concentrates gercent Cu _______________ __ 14.43 Tails percent u _______________________ ._ 3 1. 86 16. 1 1.07 . 289 1.86 17. 2 .277 REAGENTS, POUNDS PER TON I have found that a compound comprising on the Xanthogen side an alkyl radical containing five or more carbon atoms and comprising on the for mate side an alkyl radical containing a‘lesser 60 number of carbon atoms generally may be em ployed with great advantage as a notation agent. ___________________________________ __ Pine oil ________________________________ __ Ethyl xanthogen ethyl formats... _ ._ 6 6 .14 . 02 Amyl xnnthogen-ethyl formats _________________ . . 6 .14 . 14 .............. ._ . 02 Hexyl xlmthogen ethyl formats _________________________ _. ______ _ _ . 02 2,412,500 3 4 Example II in water to form three separate aqueous pulps ‘ which were subjected to separate froth ?otation operations in the presence of the reagents indi cated with the production of concentrates and in water to form two separate aqueous pulps which were subjected to separate froth ?otation operations in the presence of the reagents indi cated with the production of concentrates and tailing products of the analyses indicated: tailing products of the analyses indicated: 1 Test“ 2 a 10 Test No' Heads percent Cu ...... -. 1 Tails percent Cu _______ _. Concentrates percent Cu. Holds percentpercent Ou___' ______ __ Concentrates Cu._._ L12 16.84 silspercent Cu __________ .. .68 2 1', 12 15 v 16.48 .18 REAGENTS, POUNDS PER TON ‘ Lime ___________________________________ n Pine oil ...................... .. Ethyl mnthosen ethyl rormate_ REAGENTB, POUNDS PER TON 8 .. Amy] xauthogen amyl formate_ Lime ____________________________________________ __ 12 Ethyl xanthogen ethyl fol-mate . _ _ _ _ _ _ Plneoll ........ .; ............ __ _ ._ _ _ . _ .. .14 .02 Amyl‘mmgen “hymrmate -------------------- -- 12 .14 ' 8 8 . 2o ' Amyl xanthogen ethyl formate_ . ._ ...... _. Iclaim: . . . . '02 1. The method of concentrating sulphide ore x‘\ which comprises subjecting the ore in the form Example III of a pulp to a froth ?otation operation in the 25 presence of amyl xanthogén ethyl formats. 2. The method of concentrating sulphide ore which comprises subjecting the ore in the form of a pulp to a froth ?otation operation in the pres 30 08,81 ence of hexyl xanthogen ethyl formate. 3. The method of concentrating copper sui phide ore which comprises subjecting the ore in the form of a pulp to a froth ?otation operation in the presence of amyl xanthogen ethyl formate. 4. The method of concentrating copper sul 35 phide ore which comprises subjecting the ore in the form of a pulp to a froth ?otation operation Heads percent Cu .............. __ Concentrates gercent Cu _______ ._ Tails percent u _______________ __ in the presence of hexyl xanthogen ethyl formate. 5. The method of concentrating sulphide ore which comprises subjecting the ore in the form of a pulp to a froth ?otation operation in the presence of a compound of the group consisting of amyl xanthogen ethyl formate and hexyl xanthogen ethyl formate. Ethyl starters-5555mm; Hexyl xanthogen ethyl iormate 6. The method of concentrating copper sul phide ore which comprises subjecting the ore in the form of a pulp to a froth ?otation operating Example IV sisting of amyi xanthogen ethyl formate and Copper Queen copper sulphide ore of the follow hexyl xanthogen ethyl formate. ing composition with respect to copper was ground 50 ARTHUR H. FISCHER.