Systems and methods for alumina production

Patent metadata

Field	Value
Publication number	US-11584657-B2
Application number	US-201916524819-A
Country	US
Kind code	B2
Filing date	Jul 29, 2019
Priority date	Jul 27, 2018
Publication date	Feb 21, 2023
Grant date	Feb 21, 2023

Abstract

A method for isolating a humic substance from alumina process liquor is provided herein. Separate from or within the method, bauxite is processed to form the alumina process liquor. The method includes providing a diallyldimethylammonium chloride-containing polymer. The method further includes providing an amine-containing polymer. The method further includes combining the diallyl dimethyl ammonium chloride, the amine-containing polymer, and the alumina process liquor, to isolate the humic substance from the alumina process liquor.

First claim

What is claimed is:

1. A method for isolating a humic substance from alumina process liquor, wherein bauxite is processed to form the alumina process liquor, the method comprising:
providing a diallyldimethylammonium chloride-containing polymer;
providing an amine-containing polymer chosen from polyethyleneimine, polyallylamine, polydimethylamine, or copolymers thereof; the reaction product of a polyamine and an amine-functionalized crosslinking agent containing two or more amine moieties; and
combinations thereof; and
combining the diallyl dimethyl ammonium chloride, the amine-containing polymer, and the alumina process liquor to isolate the humic substance from the alumina process liquor.

2. The method of claim 1 , wherein the humic substance is selected from the group of humic acid, fulvic acid, and combinations thereof.

3. The method of claim 1 , wherein the diallyldimethylammonium chloride-containing polymer comprises polydiallyldimethylammonium chloride.

4. The method of claim 1 , wherein the diallyldimethylammonium chloride-containing polymer is polydiallyldimethylammonium chloride.

5. The method of claim 1 , wherein the amine-containing polymer is poly(dimethylamine-co-epichlorohydrin).

6. The method of claim 1 , wherein the amine-containing polymer comprises the reaction product of a polyamine and an amine-functionalized crosslinking agent containing two or more amine moieties.

7. The method of claim 6 , wherein the amine-functionalized crosslinking agent comprises ethylene diamine.

8. The method of claim 1 further comprising the step of separating bauxite from the alumina process liquor prior to combining the diallyl dimethyl ammonium chloride, the amine-containing polymer, and the alumina process liquor.

9. The method of claim 1 , wherein the alumina process liquor comprises sodium hydroxide.

10. The method of claim 1 , wherein the alumina process liquor comprises the diallyldimethylammonium chloride-containing polymer and the amine-containing polymer in a weight ratio of from 1:99 to 99:1.

11. The method of claim 1 , wherein the alumina process liquor comprises the diallyldimethylammonium chloride-containing polymer and the amine-containing polymer in a weight ratio of from 1:2 to 2:1.

12. The method of claim 1 , wherein the alumina process liquor comprises the diallyldimethylammonium chloride-containing polymer and the amine-containing polymer in a combined amount of from about 5 ppm to about 1000 ppm based on a total amount of the alumina process liquor.

13. The method of claim 1 , wherein the alumina process liquor comprises the diallyldimethylammonium chloride-containing polymer and the amine-containing polymer in a combined amount of from about 50 ppm to about 200 ppm based on a total amount of the alumina process liquor.

14. A method for isolating a humic substance from alumina process liquor, wherein bauxite is processed to form the alumina process liquor, the method comprising:
providing polydiallyldimethylammonium chloride;
providing poly(dimethylamine-co-epichlorohydrin); and
combining the polydiallyldimethylammonium chloride, the poly(dimethylamine-co-epichlorohydrin), and the alumina process liquor to isolate the humic substance from the alumina process liquor, wherein the polydiallyldimethylammonium chloride and the poly(dimethylamine-co-epichlorohydrin) are combined in a weight ratio of from 1:2 to 2:1 and in a combined amount of from about 50 ppm to about 200 ppm based on a total amount of the alumina process liquor.

Assignees

• Solenis Tech Lp

Inventors

• Roscoe Clive
• Andermann Lawrence J

Classifications

• C01F7/0653 Primary

  characterised by the flocculant added to the slurry (final clarification of the aluminate solution C01F7/47) · CPC title

• C01F7/14

  Aluminium oxide or hydroxide from alkali metal aluminates · CPC title

• C01F7/473 Primary

  Removal of organic compounds, e.g. sodium oxalate · CPC title

• C01F7/46

  Purification of aluminium oxide, aluminium hydroxide or aluminates (C01F7/028 takes precedence) · CPC title