Abstract:
High-purity dialkyl thionocarbamates are economically produced by reacting suitable xanthates with alkyl amines in the presence of a dissolved catalyst. Nickel and palladium salts are preferred catalysts. Thionocarbamates produced by the method of the invention are a desirable flotation reagent for certain refractory copper sulfide ores.
Abstract:
A process for the concentration by flotation of gold, gold bearing minerals and uranium oxide minerals from ores and metallurgical plant products whereby a pulp of a ground ore is agitation conditioned in at least two agitation conditioning stages wherein in at least one stage the pH of the pulp is lowered with an acid agent to within the pH range of about 1.5 to 5.0, and wherein in at least one additional agitation conditioning stage the pH of the pulp is raised to within the pH range of about 6.0 to 11.0 and wherein in at least the last stage prior to flotation at least one collector selected from the group of sulfhydryl anionic collectors is present, and subsequently, the at least two stage agitation conditoned pulp is subjected to flotation to produce a flotation concentrate enriched in at least one of the mineral values from the group consisting of gold, gold bearing minerals and uranium minerals.
Abstract:
An improved method in concentration of oxide ores and minerals by froth flotation process which comprises subjecting a pulp of mineral slurry to the combined action of a organic nitrogen compound with one or more NH.sub.2 group and hypochlorite in a slightly acid pulp of mineral slurry. The decomposition of the NH.sub.2 group provokes a highly oxidizing state in the mineral slurry, a state which can change the valency state of any metal which can change the valency state from lower to higher of the metal at the mineral surface, thus rendering the mineral particle to be capable of activating the double carbon to carbon bonds of certain collectors possessing these bonds as are olefine alcohols or olefine glycols. The indicated compounds provide recovery of oxide minerals of iron, antimony, cerium, yttrium titanium and thorium, vanadium, niobium, tantalum, chromium, and wolfram.
Abstract:
Process of froth flotation of oxide minerals which comprises using at least one of the following collector agents 1. MIXED SALTS OF AMMONIUM AND AMINES OF THE FORMULA: X(COONH4)2 (COOH.NR''R''''R'''''')2 2. ester-sulfonates of the formula: HX(COOR'')(COOR'''')(COOR'''''')(COOR'''''''')(SO3M) 3. ester amine salt sulfonates of the formula: HX(COOR)2(COOH.NR''R''''R'''''')2(SO3M) 4. sulfonates of mixed salts of ammonium and amines of the formula: HX(COONH4)2(COOH.NR''R''''R'''''')2(SO3M) in these formulae, X representing the hydrocarbon radical of the acid obtained by controlled pyrolysis of calcium citrate and acidification of the obtained pyrolysate; R being a C1-C20 alkyl radical; R'', R'''', R'''''' and R'''''''' being each hydrogen, C1-C20 alkyl, cycloalkyl, aralkyl, alkaryl or aryl, at least one of R'', R'''', R'''''' and R'''''''' being other than hydrogen and M being sodium, potassium or ammonium.
Abstract:
A NEW COMPOSITION OF MATTER AND AN IMPROVEMENT IN THE CONCENTRATION OF ORES BY FLOTATION WHICH COMPRISES SUBJECTING A SULFIDE ORE IN THE FORM OF A PULP TP A FLOTATION PROCESS IN THE PRESENCE OF AN EFFECTIVE QUANTITY OF A FLOTATION COLLECTOR COMPRISING A NEW COMPOSITION OF MATTER CORRESPONDING TO THE FORMULA
A-R1-NH-C(=S)-Y-R2
WHEREIN A IS A RADICAL CORRESPONDING TO THE FORMULA
R-X-C(-X''-R'')(-R3)- OR (-X''-CH(-Z'')-CH(-Z)-X-)>C(-R3)-
X AND Y CONSIST OF -S- OR -O-; R, R'', Z, Z'' AND R2 ARE HYDROCARBYL GROUPS, R1 IS AN ALKYLENE GROUP AND R3 IS H OR LOWER ALKYL GROUP. CERTAIN OF THE INDICATED COMPOUNDS PROVIDE FOR ENHANCED SELECTIVITY AND/OR RECOVERY OF SULFIDE MINERALS OF CU, ZN, MO, CO, NI AND PB OVER IRON SULFIDE.
Abstract:
Disclosed is a novel ore concentration process. The process involves the use of novel collectors in the flotation method for concentrating ore such, for example, as iron ore.