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Use of polyols as scale control reagents in the mining processes
US9284625B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9284625-B2 |
| Application number | US-94276907-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 20, 2007 |
| Priority date | Nov 20, 2007 |
| Publication date | Mar 15, 2016 |
| Grant date | Mar 15, 2016 |
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Abstract
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A hyperbranched polyglycerol is employed as a process stabilization aid of pregnant liquor of a Bayer process of producing alumina from bauxite. The hyperbranched polyglycerol has a molecular weight of from about 1,000 to about 1,000,000.
First claim
Opening claim text (preview).
We claim: 1. A method of increasing stability of a pregnant liquor of a Bayer process comprising: adding to the pregnant liquor of a Bayer process a hyperbranched polyglycerol having a molecular weight of from 1,000 to 1,000,000 in an amount of no less than 0.1 ppm. 2. The method of claim 1 , wherein the hyperbranched polyglycerol contains 5 to 30 milliequivalents of hydroxyl units per gram of active polymer. 3. The method of claim 1 , wherein the hyperbranched polyglycerol contains 8 to 18 milliequivalents of hydroxyl units per gram of active polymer. 4. The method of claim 1 , wherein the hyperbranched polyglycerol is synthesized via an addition polymerization. 5. The method of claim 1 , wherein the hyperbranched polyglycerol has from 25 to 12,000 monomeric units. 6. The method of claim 1 , wherein the hyperbranched polyglycerol has from 42 to 7,200 monomeric units. 7. The method of claim 1 , wherein the hyperbranched polyglycerol is a homopolymer. 8. The method of claim 6 , wherein the hyperbranched polyglycerol consists of a combination of multiple monomers. 9. The method of claim 1 , wherein the hyperbranched polyglycerol is present in the pregnant liquor of a Bayer process at a concentration of from 5 to 50 ppm. 10. The method of claim 1 , wherein the hyperbranched polyglycerol has a molecular weight of from 1,000 to 50,000. 11. Pregnant Bayer liquor comprising a hyperbranched polyglycerol having a molecular weight of from 1,000 to 1,000,000 at a concentration of from 0.1 to 100 ppm. 12. The pregnant Bayer liquor of claim 11 , wherein the hyperbranched polyglycerol has a molecular weight of from 1,000 to 50,000. 13. The method of claim 1 , wherein the hyperbranched polyglycerol is synthesized via addition polymerization of glycidol.
Assignees
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Classifications
Separation of the insoluble residue, e.g. of red mud · CPC title
Preliminary treatment of ores or scrap · CPC title
from aqueous aluminate solutions by precipitation due to cooling, e.g. as part of the Bayer process · CPC title
- C22B21/0015Primary
by wet processes (C22B21/02, C22B21/04 and C22B21/06 take precedence) · CPC title
using organic material · CPC title
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- What does patent US9284625B2 cover?
- A hyperbranched polyglycerol is employed as a process stabilization aid of pregnant liquor of a Bayer process of producing alumina from bauxite. The hyperbranched polyglycerol has a molecular weight of from about 1,000 to about 1,000,000.
- Who is the assignee on this patent?
- Wang Jing, Li Xiaojin Harry, Bode Heinrich Enoch, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification C22B21/0015. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Mar 15 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).