Compositions and methods for selective separation of minerals from sulfide ores
AssigneeCytec Industries Inc.
InventorsMikael Brasse, Esau Arinaitwe, Devarayasamudram Ramachandran Nagaraj
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Abstract
Compositions including blends of one or more acrylamide/allyl thiourea polymer as a first depressant, and one or more carboxyalkyl dithiocarbamate compound as a second depressant, and their use as depressants in the beneficiation of sulfide minerals from ores and/or concentrates are disclosed herein, along with methods for selectively separating value sulfide minerals from non-value sulfide minerals in a froth flotation process for the recovery of such value minerals.
Claims20
A composition of matter comprising a blend of a first depressant and a second depressant,
- wherein the first depressant is a polymer having a weight average molecular weight from 1,000 g/mol to 1,000,000 g/mol comprising:
- i) X units of an acrylamide derivative according to Formula (I):
- wherein
- each of R, R1, and R2 is independently chosen from H, C1-C4 alkyl, or C6-C12 aryl;
- and
- X is a residual mole percent fraction by weight based on the total mole percent by weight of Y and Z;
- ii) Y units of a thiourea derivative according to Formula (II):
- wherein
- R3 is chosen from H, a C1-C4 alkyl, or C6-C12 aryl;
- each of R4 and R5 is independently chosen from H, C1-C4 hydrocarbyl, or a C6-C12 aryl;
- and
- Y is a mole percent fraction from 1% to 50% by weight based on the total weight of X, Y, and Z;
- and
- iii) Z units of a polymerization residue of any monomer copolymerizable with the derivatives according to Formulas (I) and (II), wherein Z is a mole percent fraction from 0% to 50% by weight based on the total weight of X, Y, and Z;
- and
- wherein the second depressant is a dithiocarbamate compound according to Formula (III):
- wherein
- R6 is chosen from H, or a moiety having from 1-12 carbon atoms and one or more functional groups selected from OH, SO3−M+, COO−M+, and CONR8R9, wherein each of R8 and R9 is independently chosen from H or C1-C4 alkyl;
- R7 is chosen from a moiety having from 1-12 carbon atoms and one or more functional groups selected from OH, SO3−M+, COO−M+, and CONR8R9, wherein each of R8 and R9 is independently chosen from H or C1-C4 alkyl;
- each instance of M is independently chosen from a cation selected from the group consisting of alkali metal, metal, or R104N+, wherein each instance of R10 is independently chosen from H or a C1-C12 alkyl,
- wherein the blend is further characterized as being an aqueous solution;
- and having 4<pH≤14 at a temperature from −5° C. to 85° C.
A method for selectively separating value sulfide minerals from non-value sulfide minerals in a froth flotation process for the recovery of said value minerals from an ore or concentrate containing said value and non-value minerals, the method comprising:
- adding to one or more stage of the froth flotation process a first depressant and a second depressant in an amount sufficient to increase the value minerals in the froth, thereby selectively separating the value minerals from the non-value minerals,
- wherein the first depressant is a polymer having a weight average molecular weight from 1,000 g/mol to 1,000,000 g/mol comprising:
- i) X units of an acrylamide derivative according to Formula (I):
- wherein
- each of R, R1, and R2 is independently chosen from H, C1-C4 alkyl, or C6-C12 aryl;
- and
- X is a residual mole percent fraction by weight based on the total mole percent by weight of Y and Z;
- ii) Y units of a thiourea derivative according to Formula (II):
- wherein
- R3 is chosen from H, a C1-C4 alkyl, or C6-C12 aryl;
- each of R4 and R5 is independently chosen from H, C1-C4 hydrocarbyl, or a C6-C12 aryl;
- and
- Y is a mole percent fraction from 1% to 50% by weight based on the total weight of X, Y, and Z;
- and
- iii) Z units of a polymerization residue of any monomer copolymerizable with the derivatives according to Formulas (I) and (II), wherein Z is a mole percent fraction from 0% to 50% by weight based on the total weight of X, Y, and Z;
- and
- wherein the second depressant is a dithiocarbamate compound according to Formula (III):
- wherein
- R6 is chosen from H, or a moiety having from 1-12 carbon atoms and one or more functional groups selected from OH, SO3−M+, COO−M+, and CONR8R9, wherein each of R8 and R9 is independently chosen from H or C1-C4 alkyl;
- R7 is chosen from a moiety having from 1-12 carbon atoms and one or more functional groups selected from OH, SO3−M+, COO−M+, and CONR8R9, wherein each of R8 and R9 is independently chosen from H or C1-C4 alkyl;
- each instance of M is independently chosen from a cation selected from the group consisting of alkali metal, metal, or R104N+, wherein each instance of R10 is independently chosen from H or a C1-C12 alkyl.
Dependencies are inferred from the claim text.