Depressants for Mineral Ore Flotation

Patent metadata

Field	Value
Publication number	US-2018071752-A1
Application number	US-201515538471-A
Country	US
Kind code	A1
Filing date	Dec 18, 2015
Priority date	Dec 30, 2014
Publication date	Mar 15, 2018
Grant date	—

Abstract

Depressants comprising a polymer comprising: a) recurring units of one or more acrylamide monomers; b) recurring units of one or more monomers selected from hydroxyalkyl alkylacrylate, allyloxyalkyldiol, allyloxyethanol, trimethylolpropane allyl ether, and 2-hydroxy ethyl acrylate; and optionally, c) recurring units of one or more acrylic acid monomers are provided. Also disclosed are processes for enriching a desired mineral from an ore comprising the desired mineral and gangue, wherein the process comprises carrying out a flotation process in the presence of one or more of the depressants.

First claim

1 . A depressant comprising a polymer comprising a) recurring units of one or more acrylamide monomers; b) recurring units of one or more monomers selected from hydroxyalkyl alkylacrylate, allyloxyalkyldiol, allyloxyethanol, trimethylolpropane allyl ether, and 2-hydroxy ethyl acrylate; and optionally, c) recurring units of one or more acrylic acid monomers.

2 . The depressant of claim 1 , wherein the polymer comprises recurring units of one or more hydroxyalkyl alkylacrylate monomers.

3 . The depressant of claim 1 , wherein the recurring units in the polymer comprise about 70% to about 95% of the one or more acrylamide monomers and about 5% to about 30% of the one or more monomers selected from hydroxyalkyl alkylacrylate, allyloxyalkyldiol, allyloxyethanol, trimethylolpropane allyl ether, and 2-hydroxy ethyl acrylate.

4 . The depressant of claim 2 , wherein the one or more hydroxyalkyl alkylacrylate monomers comprises a hydroxyalkyl moiety and an alkylacrylate moiety.

5 . The depressant of claim 4 , wherein the alkyl of the hydroxyalkyl moiety is selected from a C 1-6 linear or branched alkyl and wherein the alkyl of the alkylacrylate moiety is selected from a C 1-6 linear or branched alkyl.

6 . The depressant of claim 2 , wherein the one or more hydroxyalkyl alkylacrylate monomers comprises hydroxyethyl methylacrylate.

7 . The depressant of claim 1 , wherein the recurring units in the polymer comprise about 5% to about 92% of the one or more acrylamide monomers, about 3% to about 65% of the one or more acrylic acid monomers, and about 5% to about 30% of the one or more monomers selected from hydroxyalkyl alkylacrylate, allyloxyalkyldiol, allyloxyethanol, trimethylolpropane allyl ether, and 2-hydroxy ethyl acrylate.

8 . A composition comprising: one or more depressant according to claim 1 ; and a solvent.

9 . The composition of claim 7 , wherein the solvent is water.

10 . A process for enriching a desired mineral from an ore comprising the desired mineral and gangue, wherein the process comprises carrying out a flotation process in the presence of one or more depressants according to claim 1 .

11 . The process of claim 9 , wherein the desired mineral is an iron-containing mineral.

12 . The process of claim 9 , wherein the gangue comprises oxides of silica, silicates or siliceous materials.

13 . The process of claim 9 , wherein the flotation process is a reverse cationic flotation process.

14 . The process of claim 9 , wherein the one or more depressants is added in the form of a composition comprising the depressant and a solvent.

15 . The process of claim 13 , wherein the solvent is water.

16 . The process of claim 9 , wherein the improves the grade of iron from iron ore such that the grade of the recovered iron is at least about 61%.

17 . The process of claim 9 , wherein the process reduces the amount of silica in the iron ore to less than about 10%.

Assignees

• Kemira Oyj

Inventors

• Moore Lucas
• Yin Xihui
• Durand Jean Robert

Classifications

• B03D1/016 Primary

  Macromolecular compounds · CPC title

• B03D1/008

  containing oxygen · CPC title

• B03D2203/02

  Ores · CPC title

• B03D2201/06

  Depressants · CPC title

• B03D1/01

  containing nitrogen · CPC title