JPS565327A - Preparation of high purity alkali chromate - Google Patents
Preparation of high purity alkali chromateInfo
- Publication number
- JPS565327A JPS565327A JP7908979A JP7908979A JPS565327A JP S565327 A JPS565327 A JP S565327A JP 7908979 A JP7908979 A JP 7908979A JP 7908979 A JP7908979 A JP 7908979A JP S565327 A JPS565327 A JP S565327A
- Authority
- JP
- Japan
- Prior art keywords
- alkali
- vanadate
- chromate
- insoluble
- leaching solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
PURPOSE: To efficiently provide high purity alkali vanadate by a method wherein a specific amount of iron salt is added to leaching solution of alkali chromate contg. alkali vanadate, the alkali vanadate is transformed to insoluble coarse particles at a specific pH, and then separated.
CONSTITUTION: Alkali chromate leaching solution obtained from chromium ore generally contains alkali vanadate and aluminate. Neutralization by acid easily removes Al components but alkali vanadate remains as impurity. To remove it, the leaching solution is added with iron salt consisting of trivalent sulfate or nitrate in amount equivalent to one or more Fe/V (molar ratio) and pH is adjusted to 6.5W11. This causes a reaction to form alkali vanadate coarse particles which are insoluble and easy to separate. Thus, high-purity alkali chromate is provided in high separation and cleaning efficiency. In the above process, aluminum component may be made to insoluble at the same time as alkali vanadate.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7908979A JPS5934650B2 (en) | 1979-06-25 | 1979-06-25 | Production method of high purity alkali chromate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7908979A JPS5934650B2 (en) | 1979-06-25 | 1979-06-25 | Production method of high purity alkali chromate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS565327A true JPS565327A (en) | 1981-01-20 |
| JPS5934650B2 JPS5934650B2 (en) | 1984-08-23 |
Family
ID=13680147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7908979A Expired JPS5934650B2 (en) | 1979-06-25 | 1979-06-25 | Production method of high purity alkali chromate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5934650B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59197821A (en) * | 1983-04-04 | 1984-11-09 | コンピユ−タ−・メモリ−ズ・インコ−ポレイテッド | Positional coder device |
| JPS61160012A (en) * | 1985-01-09 | 1986-07-19 | Fanuc Ltd | Encoder |
| JPH01250019A (en) * | 1988-01-11 | 1989-10-05 | Superior Electric Co:The | Two-phase signal generation apparatus and method |
-
1979
- 1979-06-25 JP JP7908979A patent/JPS5934650B2/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59197821A (en) * | 1983-04-04 | 1984-11-09 | コンピユ−タ−・メモリ−ズ・インコ−ポレイテッド | Positional coder device |
| JPS61160012A (en) * | 1985-01-09 | 1986-07-19 | Fanuc Ltd | Encoder |
| JPH01250019A (en) * | 1988-01-11 | 1989-10-05 | Superior Electric Co:The | Two-phase signal generation apparatus and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5934650B2 (en) | 1984-08-23 |
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