US 2024/0149277 A1Published application

Dithiocarbamate depressants, methods and uses thereof in froth flotation mineral separation

AssigneeTessenderlo Kerley, Inc.

InventorsMelissa RHODEHOUSE, Mukund VASUDEVAN, Michael HOJJATIE, Paul MORAN

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Abstract

A process for recovering a first mineral comprising the steps of: (a) providing a pulp comprising solids and water, wherein the solids comprise the first mineral; (b) adding a first depressant to the pulp; (c) subjecting the pulp to a froth flotation process to produce a froth comprising the first mineral; and (d) recovering the froth; characterized in that the first mineral is a sulfide mineral, and the first depressant consists of one or more dithiocarbamic acids or salts thereof of formula (I). A composition comprising the first depressant, and further comprising one, two or three of a collector, a second depressant and a mineral. The use of a dithiocarbamic acid or salt thereof of formula (I). The dithiocarbamic acid or salt thereof of formula (I) which is 3-ammo-1,2-propanediol dithiocarbamic acid or a salt thereof, 2-amino-2-methyl-1,3,-propanediol dithiocarbamic acid or a salt thereof, or N-phenylethylenediamine dithiocarbamic acid or a salt thereof.

Claims29

Dependent claims

A process for recovering a first mineral comprising the steps of:

(a) providing a pulp comprising solids and water, wherein the solids comprise the first mineral;
(b) adding a first depressant to the pulp;
(c) subjecting the pulp to a froth flotation process to produce a froth comprising the first mineral;
and
(d) recovering the froth;
wherein the first mineral is a sulfide mineral, and the first depressant consists of one or more dithiocarbamic acids or salts thereof of formula (I)
wherein
R1 represents a first substituent having from 1 to 8 carbon atoms and comprising at least one functional group selected from alcohols, amines, ethers, ketones, acetals, ketals, aminoacetals, hemiaminal ethers or combinations thereof, preferably selected from alcohols, amines, ethers or combinations thereof, wherein R1 comprises at most two amine functional groups;
and
R2 represents H or a second substituent having from 1 to 8 carbon atoms and optionally comprising at least one functional group selected from alcohols, amines, ethers, ketones, acetals, ketals, aminoacetals, hemiaminal ethers or combinations thereof, preferably selected from alcohols, amines, ethers or combinations thereof;
or
R1 and R2 are connected to form a heterocyclic 3 to 7 membered ring comprising at least 2 heteroatoms, which is optionally substituted with one, two or three functional groups selected from —OH, C1-C4 alkyl, C2-C4 alkenyl, C1-C4 hydroxyalkyl, —NRaRb and combinations thereof, wherein Ra and Rb are independently selected from H and C1-C4 alkyl;
and
R3 represents hydrogen or a cation;
with the provisio that when R1 comprises no other functional groups than alcohols, the process does not comprise the use of a second depressant selected from polymers comprising an allyl thiourea functional group and a hydrophilic acrylamide group;
characterized in that recovering the froth in step (d) provides a second pulp comprising the first mineral which has an increased concentration of the first mineral based on dry weight, compared to the pulp provided in step (a).

13 more elements

A process for recovering a first mineral comprising the steps of:

(a) providing a pulp comprising solids and water, wherein the solids comprise the first mineral;
(b) adding a first depressant to the pulp;
(c) subjecting the pulp to a froth flotation process to produce a froth comprising the first mineral;
and
(d) recovering the froth;
characterized in that the first mineral is a sulfide mineral, and the first depressant consists of one or more dithiocarbamic acids or salts thereof of formula (I)
wherein
R1 represents a first substituent having from 1 to 8 carbon atoms and comprising at least one functional group selected from alcohols, amines, ethers, ketones, acetals, ketals, aminoacetals, hemiaminal ethers or combinations thereof, preferably selected from alcohols, amines, ethers or combinations thereof, wherein R1 comprises at most two amine functional groups;
and
R2 represents H or a second substituent having from 1 to 8 carbon atoms and optionally comprising at least one functional group selected from alcohols, amines, ethers, ketones, acetals, ketals, aminoacetals, hemiaminal ethers or combinations thereof, preferably selected from alcohols, amines, ethers or combinations thereof;
or
R1 and R2 are connected to form a heterocyclic 3 to 7 membered ring comprising at least 2 heteroatoms, which is optionally substituted with one, two or three functional groups selected from —OH, C1-C4 alkyl, C2-C4 alkenyl, C1-C4 hydroxyalkyl, —NRaRb and combinations thereof, wherein Ra and Rb are independently selected from H and C1-C4 alkyl;
and
R3 represents hydrogen or a cation;
with the provisio that when R1 comprises no other functional groups than alcohols, the process does not comprise the use of a second depressant selected from polymers comprising an allyl thiourea functional group and a hydrophilic acrylamide group;
with the provisio that the first depressant is not N-(2-aminoethyl)dithiocarbamic acid or a salt thereof.

13 more elements

Dependencies are inferred from the claim text.