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Process for preparing aqueous solutions of cobalt sulfate
US9321656B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9321656-B2 |
| Application number | US-201314405025-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 2, 2013 |
| Priority date | Jul 10, 2012 |
| Publication date | Apr 26, 2016 |
| Grant date | Apr 26, 2016 |
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Abstract
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Process for preparing an aqueous cobalt sulfate solution having a pH in the range from 5 to 8, wherein (a) metallic cobalt is dissolved in aqueous sulfuric acid in an atmosphere of low-oxygen air, of hydrogen or of inert gas and (b) the resulting acidic cobalt sulfate solution is purified in an ion exchanger.
First claim
Opening claim text (preview).
The invention claimed is: 1. A process for preparing an aqueous cobalt sulfate solution having a pH of from 5 to 8, the process comprising: (a) dissolving metallic cobalt in aqueous sulfuric acid in an atmosphere of hydrogen or of inert gas or of nitrogen/oxygen mixtures comprising nitrogen and oxygen in a volume ratio of from 6:1 to 100:1, thereby obtaining an acid cobalt sulfate solution, and (b) purifying the acidic cobalt sulfate solution in an ion exchanger. 2. The process according to claim 1 , wherein the ion exchanger is a crosslinked or a sulfonated polystyrene. 3. The process according to claim 1 , wherein said dissolving (a) is carried out at a temperature of from 80 to 110° C. 4. The process according to claim 1 , further comprising (c) purifying the aqueous cobalt sulfate solution via a filter. 5. The process according to claim 1 , wherein a concentration of the aqueous sulfuric acid in said dissolving (a) is from 10 to 30% by weight. 6. The process according to claim 1 , wherein the aqueous cobalt sulfate solution comprises an Na+ content of not more than 1000 ppm, based on cobalt. 7. The process according to claim 1 , wherein the aqueous cobalt sulfate solution comprises iron ions at a content of not more than 50 ppm, based on cobalt. 8. The process according to claim 1 , wherein the aqueous cobalt sulfate solution comprises calcium ions at a content of not more than 50 ppm, based on cobalt. 9. The process according to claim 1 , wherein the aqueous cobalt sulfate solution comprises copper(II) ions at a content of not more than 50 ppm, based on cobalt. 10. The process according to claim 1 , wherein the aqueous cobalt sulfate solution comprises aluminum ions at a content of not more than 50 ppm, based on cobalt. 11. The process according to claim 1 , wherein the aqueous cobalt sulfate solution comprises chromium(III) ions at a content of not more than 50 ppm, based on cobalt.
Assignees
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Classifications
- C01G51/10Primary
Sulfates · CPC title
Compositional purity · CPC title
Preparation or separation involving a liquid-liquid extraction, an adsorption or an ion-exchange · CPC title
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- What does patent US9321656B2 cover?
- Process for preparing an aqueous cobalt sulfate solution having a pH in the range from 5 to 8, wherein (a) metallic cobalt is dissolved in aqueous sulfuric acid in an atmosphere of low-oxygen air, of hydrogen or of inert gas and (b) the resulting acidic cobalt sulfate solution is purified in an ion exchanger.
- Who is the assignee on this patent?
- Basf Se
- What technology area does this patent fall under?
- Primary CPC classification C01G51/10. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Apr 26 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).