Cationic flotation of silica and apatite from oxidized iron ores at natural pH

Patent metadata

Field	Value
Publication number	US-10786819-B2
Application number	US-201716071750-A
Country	US
Kind code	B2
Filing date	Jan 20, 2017
Priority date	Jan 21, 2016
Publication date	Sep 29, 2020
Grant date	Sep 29, 2020

Abstract

A process to beneficiate oxidized iron ore can include the steps of: (1) adding a polysaccharide to the oxidized iron ore; (2) adding at least one amine; and (3) adding at least one salt; wherein the pH of the process is below 10 and greater than 5.

First claim

What is claimed is:

1. A process to beneficiate oxidized iron ore comprising the steps of:
adding a polysaccharide to the oxidized iron ore;
adding at least one amine, wherein adding at least one amine comprises:
adding at least one amine in a first stage at a first increment; and
after the first stage, adding at least one amine in a subsequent stage at a second increment different from the first increment; and

adding at least one salt,
wherein the pH of the process is below 10 and greater than 5.

2. The process of claim 1 wherein the polysaccharide comprises:
polysaccharide carbohydrates (C 6 H 10 O 5 ) n consisting of a number of glucose monosaccharide units joined together by glycosidic bonds; and wherein
n ranges from 2 to 1,000 inclusive.

3. The process of claim 1 wherein
the polysaccharide is a causticized starch.

4. The process of claim 1 wherein
the at least one amine is an alkyl amines having between 2-20 carbons.

5. The process of claim 4 wherein
the at least one amine is dodecyl amine.

6. The process of claim 1 wherein
the at least one amine is an aromatic amine having between 6-40 carbon atoms.

7. The process of claim 1 wherein
the at least one amine is a cycloaliphatic amine.

8. The process of claim 1 wherein
said at least one salt comprises a cation selected from the group consisting of magnesium, calcium and sodium.

9. The process of claim 8 wherein
said at least one salt comprises a divalent cation.

10. The process of claim 9 wherein
said at least one divalent cation is selected from the group consisting of magnesium and calcium.

11. The process of claim 1 wherein
said pH is between 6 to 9 inclusive.

12. The process of claim 1 wherein
said step of adding at least one amine comprises adding at least one amine in three or more stages.

13. The process of claim 12 wherein
said step of adding at least one amine comprises adding at least one amine in four or more stages.

14. The process of claim 13 , wherein
said step of adding at least one amine comprises adding at least one amine in five or more stages.

15. The process of claim 1 wherein
said step of adding at least one amine comprises adding at least one amine in between 2 to 5 stages inclusive.

16. The process of claim 1 wherein
said step of adding at least one amine comprises adding at least one amine in between 3 to 5 stages inclusive.

17. The process of claim 1 wherein
said step of adding at least one amine comprises adding at least one amine in between 4 to 5 stages inclusive.

18. The process of claim 11 wherein
no desliming step is performed.

19. The process of claim 1 which further comprises the step of:
adding at least one polyphosphate activator.

20. The process of claim 19 wherein
the beneficiated iron ore concentrate contains less than or equal to 0.100% phosphorus.

21. The process of claim 20 , wherein a beneficiated iron ore concentrate contains less than or equal to 0.020% phosphorus.

22. A process to beneficiate oxidized iron ore comprising:
adding a causticized starch to the oxidized iron ore;
adding at least one amine to the oxidized iron ore, wherein adding at least one amine to the oxidized iron ore comprises:
adding at least one amine to the oxidized iron ore in a first stage at a first increment; and
after the first stage, adding at least one amine to the oxidized iron ore in a subsequent stage at a second increment greater than the first increment;

adding at least one polyphosphate activator; and
adding at least one salt;
wherein the pH of the process is between approximately 6 and 9 inclusive; and
wherein no desliming step is performed.

23. The process of claim 22 , wherein a beneficiated iron ore concentrate contains less than or equal to 0.100% phosphorus.

24. The process of claim 23 , wherein the beneficiated iron ore concentrate contains less than or equal to 0.050% phosphorus.

25. The process of claim 24 , wherein the beneficiated iron ore concentrate contains less than or equal to 0.020% phosphorus.

26. The process of claim 1 , wherein the second increment is greater than the first increment.

27. The process of claim 26 , wherein the first increment is about 0.05 pounds per ton.

Assignees

• Univ Minnesota

Inventors

• Mlinar Matthew Albert
• Petersen Tom Steven

Classifications

• C22B1/2406

  pelletizing · CPC title

• B03D1/01

  containing nitrogen · CPC title

• C22B1/00

  Preliminary treatment of ores or scrap · CPC title

• C22B1/11

  Removing sulfur, phosphorus or arsenic other than by roasting · CPC title

• B03D1/02 Primary

  Froth-flotation processes · CPC title