Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS1659396 A
Publication typeGrant
Publication dateFeb 14, 1928
Filing dateOct 25, 1926
Priority dateOct 25, 1926
Publication numberUS 1659396 A, US 1659396A, US-A-1659396, US1659396 A, US1659396A
InventorsWilliam A Douglass
Original AssigneeDu Pont
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Process of concentrating ores and minerals by flotation
US 1659396 A
Abstract  available in
Images(2)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Patented Feb. 14, 1928.

UNITED STATES PATENT OFFICE;

WILLIAM A. DOUGLASS, OF PENNS GROVE, NEW JERSEY, ASSIGNOR TO E. I. DU IONl- DE NEMOURS & COMPANY, OF WILMINGTON, DELAWARE, A CORPORATION OF DEL- AWARE.

PROCESS OIE GONCENTRATING ORES AND MINERALS BY FLOTA'IION.

N Drawing.

This invention relates to the recovery of valuable ores and minerals by flotation, and comprises more particularly the concentration of such ores and minerals by means of a certain class of organic flotation agents.

It is one of the objects of the present invention to carry out flotation processes in an eficient manner by using as the flotation agent one of a class of organic compounds having highly selective properties when so used. It is-a further object to carry out the flotation processes by using flotation agents which are suitable for use in neutral, alkaline or acid flotation circuits without decoinplosition of the flotation agents.

ave discovered that these and other ob jects may be accomplished by using in a flotation process organic derivatives of trithio carbonic acid as the flotation agents. These compounds are characterized by having the following general structural formula:

where R and R are orgamc groups. R and B may represent the same or different organic groups.

A specific example of a derivative in which R and R are alkyl groups is diethyl ester of trithio carbonic acid having the following formula:

' s,-o,n

SCaHt somooocm.

Dibenzoyl trithio carbonate having the formula:

SCHgCOO 02115 is an example of a derivative in which R and R are acyl groups. Diethyl thiol ester Application filed October 25, 1926. Serial No. 144,193.

of thion carbonyl disulfide having the following formula:

S=(l]-SOgH5 18 still another type of derivative of trithio carbonate, wherein Ris an alkyl group and R is another trithio carbonate group having the following formula:

S- SJ in which X represents an organic group such as an alkyl.

The various derivatives of trithio carbonic acid may be made in any suitable manner. For instance, diethyl trithio carbonate can be made by dissolving 150 grams of potassium hydroxide in 250 cc. water, and saturating this solution with hydrogen sulfide. To this solution is added 150 grams of potasslum hydroxideand, when all is dissolved. 250 grams of carbon bisulfide are added and the mixture agitated vigorously until all of the carbon disulfide goes into solution. The solution is washed once with 300 cc. of alcohol. To the water layer containing potassium trithio carbonate, 300 grams of ethyl bromide are slowly added with agitation and coolin The reaction product is washed with water and the excess ethyl bromide removed by bubbling a current of air through the liquid. The resulting orange red liquid is pure diethyl trithio carbonate.

This compound may loo-used as a flotation reagent in the following manner: 500 grams of minus 29 mesh Phelps-Dodge Corporation Copper Queen ore are ground for 20 minutes in a pebble mill with 500 cc. of water, 0.6 grams of lime and 0.025 grams of diethyl trithio carbonate. The lime and diethyl trithio carbonate are in the proportions of 2,4 lbs. and 0.10 lb. respectively per ton of ore. The pulp from the pebble mill is transferred to a J anney laboratory flotation machine and a frothing agent (terpineol or pine oil) added. The pulp is diluted to about two liters and a rougher concentrate removed for 10 minutes, water being added as needed. The following results were obtained:

% Cu in concentrate=7 .25.

% Cu in tailings=.22.

Extraction 87.6

Using Anaconda Table Tailings in a neutral circuit with diethyl trithio carbonate as the flotation reagent in the proportion of 0.15 lbs. per ton of ore, the following results were obtained:

% Cu in heads=1.88.

% Cu in concentrate 8.84:.

% Cu in tailings=0.18.

Total Cu recovered=92.3%.

The flotation reagents forming part of the present invention do not decompose in an acid solution, and are therefore suitable for use in acid flotation circuits. .Using as the flotation reagent diethyl trithio carbonate in the proportion of 0.15 lbs. per ton of ore in a circuit containing 7.0 lbs. of sulfuric acid per ton of ore, the following results were obtained:

% Cu in heads=l.88.

% Cu in concentrate=9.68.

% Cu in tailings=0.085.

Total Cu recovered=96.3%.

Dibenzoyl trithio carbonate can be made conveniently by treating potassium trithio carbonate in benzene suspension with benzoyl chloride, removing the heat of reaction by cooling. After filtration from the potassium chloride and evaporation of the solvent, dibenzoyl trithio carbonate is obtained as a yellowish orange oil.

When tested as a flotation reagent using an alkaline circuit according to the process described, the following results were obtained:

% Cu in concentrate=6.67.

% Cu in tailings=.20.

Extraction=89.2%.

Diethyl thiol ester of thioncarbonyl disulfide may be made by treating the mono ethyl ester of trithio carbonic acid (Chancel Jahres bericht fiir Chemie 1851, p. 513) with iodine. The orange brown oil which is formed, is washed with water and then dried with calcium chloride.

When tested as a flotation reagent using an alkaline circuit according to the process described, the following results were obtained:

% Cu in concentrate=6.60.

% Cu in tailings=0.24.

E xtraction=86.9%.

In illustrating the present process, reference has been made specifically to certain ores and reagents, and to various specific conditions of operation. It will be understood that the present process is not limit- 7 ed to the specific substances or details of procedure mentioned, but includes generally processes of recovering values from ores by flotation in which the flotation agents are members of the class of compounds described. For instance, it has been pointed out as being desirable to add a frothing agent in the specific examples noted. However, where the flotation agent itself has sutficient frothing power, the frothing agent may be omitted.

Any suitable modifications and changes may be made without departing from the spirit and scope of the invention.

I claim:

1. In the process of concentratin ores and minerals by flotation the step which comprises subjecting the ore in the form of a pulp to a froth flotation operation in the presence of an organic derivative of trithio carbonate.

2. In the process of concentrating ores and minerals by flotation, the step which comprises subjecting the ore in the form of a pulp to a froth flotation operation in the presence of an organic derivative of trithio carbonate having the following structural formula:

where R and R are organic groups.

3. In the process of concentrating ores and minerals by flotation, the step which comprises subjecting the ore in the form of 1 a pulp to a froth flotation operation in the presence of an organic derivative of trithio carbonate having the following structural formula:

SR =C/ in which R is an alkyl group and R is an

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2634291 *Nov 13, 1951Apr 7, 1953Phillips Petroleum CoPrimary and secondary alkyl sulfenyl trithiocarbonates
US2676129 *Jun 12, 1951Apr 20, 1954Stauffer Chemical CoAliphatic trithiocarbonate nematocides
US3901450 *Nov 6, 1972Aug 26, 1975Weston DavidFlotation with xanthate
US4316797 *Sep 10, 1980Feb 23, 1982Phillips Petroleum CompanyFlotation agent and process
US4341715 *Oct 6, 1980Jul 27, 1982Phillips Petroleum CompanyS-Allyl-S'-n-butyl-trithiocarbonate
US4518492 *Jun 15, 1984May 21, 1985Phillips Petroleum CompanyOre flotation with combined collectors
US4594151 *May 2, 1985Jun 10, 1986Societe Nationale Elf Aquitaine (Production)Froth flotation; adding flotation collector
Classifications
U.S. Classification209/166, 558/244, 558/243, 209/901
International ClassificationB03D1/012
Cooperative ClassificationY10S209/901, B03D1/012
European ClassificationB03D1/012