US1852109A - Froth flotation - Google Patents

Description

atented Apr. 5, 1932 UNITED STATES L'UDWIG J'- CHRISTMAI TN, OF JERSEY CITY, AND STUART A. FALCONER, OF ELIZABETH, NEW JERSEY, ASSIGNORS 'IO AMERICAN CYANAMID COMPANY, OF NEW YORK, N. Y.,

A CORPORATION OF MAINE FROTH FLO'IATIOIF No Drawing.

This invention relates to the froth flotation of ores and more particularly to a process which involves the use of promotors of flotation which are novel and useful.

It is among the objects of this invention to provide a method for the separation of various minerals from ores containing the same.

More particularly it is amon the objects of this invention to recover sulfi e minerals and oxidized minerals even in very small amounts from ores. By oxidized minerals, we include compounds of heavy metals, such as lead, zinc, copper, etc., in chemical combination with elements or groups of elements'other than sulphur, for instance, in theform of oxides, hydroxides, carbonates and the like. Our invention contemplates the use as a promotor in a froth flotation operation, of the reaction products of carbon bisulphide and a hydrazine. We generally utilize a substituted hydrazine, either of the aryl or alkyl t pe.

Although many of the promotors may be successfully used in the flotation of sulfide ores, relatively few are efiective in the flotation of oxidized minerals. We have discovered that the abpve mentioned class of comuse salts thereof, such salts being s pounds, and particularly the dithiocarbazides, are effective not only for sulfide flotation but also for oxide flotation. Although the free carbazide may be used, we prefer to generally of an alkaline nature. We may a 0 use such reagents in combination with other promotors and with frothers and conditioners.

In order to prepare the compounds constituting the subject matter of this invention, we may provide a mixture of 55 parts by weight of phenyl hydrazine hydrochloride with parts by weight of carbon disulfide and parts of water. This mixture is cooled in an ice bath and a solution of 33 parts of potassium hydroxide in 50 parts of water is slowly added with stirring.

After all the potassium hydroxide has been added the mixture is filtered and washed. The filtrate is acidified in an ice bathwith hydrochloric acid producing a white precipitate which is filtered and washed. The residue from the reaction mixture is dissolved Iron l 12.9

Application filed January 27, 1930. Serial No. 423,892.

Per cent Copper 5.10

Insoluble; 62.1

A sample was stage crushed to minus 20 mesh. A 1200 gram portion of this minus 20 mesh ore and 600 cc. of water with 4 lbs. of lime per ton were ground in a steel laboratory'rod mill for a 10 minute period. The above grind was transferred to a flotation machine of the sub-aeration type and diluted to 22% solids. Reagents were added to the machine as follows 0.05 lbs. of tphenyldithiocarbazide made up as sodium salt per on 0.03 lbs. of gns #5 "steam distilled pine oil per ton A concentrate Was removed for 3 minutes In the flotation of oxide ores these reagents are very effective and the following example illustrates our invention in connec tion with oxidized lead ore. y

1200 g. of minus ten mesh ore, 1200 g. of water 5.0 lbs. of crude mono ammonium phosphate per ton of ore were ground in a steel mesh of the feed was 60% minus 200 mesh The rod mill charge was transferred to a sub-aeration machine and diluted to 22% solids. The reagents are added to the ma chine and a mineralized froth collected for 20 minutes.

Reagents in lbs. per ton of ore Ammonium dibut '1 d1thlophospl1ate..-: 1. 25 1. 25 Phenyl dithiocar nzlde 4. 0 Crude mono-ammonium phosphate- 5. 0 5. 0 Percent lead in heads 26. 6 27. 2 Percent lead in concentrntes 38. 2 47. Percent lead in tails 19. 59 4. 88 Percent lead in recovery 54. 5 91. 4

The class of compounds used by us may be denoted by the following structural formula: i a

s n-nn-nu-d s-me in which R is the aryl or alkyl group, such as phenyl, tolyl, naph'thyl, methyl and the like, or hydrogen; and Me is an alkaline metal such as calcium, ammonium, sodium and the like, or hydrogen.

Although we have described our invention setting forth a few specific examples of the promotors which we have found effective and of ores with which we have worked, our invention is broader than the specific disclosure, in that a large number of compounds may be used in accordance withour invention and a largevariety of ores maybe successfully floated therewith.

Our invention is, therefore, to be construed broadl except as limited by the claims appende hereto. Y

What we claim is: 1. A method of recovering minerals from ores which comprises subjecting an ore'to a froth flotation operation in the presence of a dithiocarbazide as a promotor. 1

' 2. A method of recovering minerals from ores which comprises subjecting an ore to a froth flotation operation in the presence of a substituted dithiocarbazide as a promotor.

3. A method of recovering minerals from ores which comprises subjectingan ore to a froth flotation operation in the presence of an aryl dithiocarbazide as a promotor.

4. A method of recovering minerals from ores which comprises subjectingan ore to a froth flotation operation in the presence of a phenyl dithiocarbazide as a promotor.

5. A method of recovering minerals from ores which comprises subjecting an ore to a froth flotation operation in the resence of an alkaline salt of a dithiocarbazi e as a promotor. 1

6. A method of recovering minerals from ores which comprises subjecting an ore to a froth flotation operation in the resence of an alkaline salt of asubstitute dithiocarbazide as a promotor.

froth flotation operation'in the presence of an alkaline salt of an aryl dithiocarbazide as a promotor.

8. A method of recovering minerals from ores which comprises subjecting an ore to a froth flotation operation in the presence of an alkaline salt of a phenyl dithlocarbazide as a promotor.

9. A method of recovering minerals from ores which comprises subjecting an ore to a froth flotation operation in the presence of a promotor having the following structural,

formula n-mn-mn--s-m where R is aryl or alkyl or hydrogen and Me is alkaline radical or hydrogen;

In testimony whereof, we have hereunto subscribed-our names this 21st day of J anuary, 1930.

' LUDWIG J. CHRISTMANN.

STUART A. FALCONER. Y i