US1949929A - Dissolving cadmium metal in sulphuric acid in the presence of metallic iron - Google Patents
Dissolving cadmium metal in sulphuric acid in the presence of metallic iron Download PDFInfo
- Publication number
- US1949929A US1949929A US641761A US64176132A US1949929A US 1949929 A US1949929 A US 1949929A US 641761 A US641761 A US 641761A US 64176132 A US64176132 A US 64176132A US 1949929 A US1949929 A US 1949929A
- Authority
- US
- United States
- Prior art keywords
- sulphuric acid
- cadmium metal
- metallic iron
- cadmium
- iron
- 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.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G11/00—Compounds of cadmium
Definitions
- the present invention relates to a process of dissolving metallic cadmium in hot, dilute sulphuric acid and is characterized by the fact that the operation is carried out in the presence of s metallic iron.
- I have, for instance, heated cadmium metal in boiling 20% sulphuric acid in which has been immersed a piece of sheet steel and found that in 48 hours 90 parts of cadmium metal were dissolved whereas only 6 parts of the iron had gone into solution.
- iron salts such as ferrous sulphate or other metals, such as copper
- iron salts when present in the sulphuric acid do not materially affect the rate of attack of the sulphuric acid upon the cadmium metal.
- the cadmium sulphate solution obtained according to my novel process contains small amounts of ferrous sulphate. This, however, can be removed from the cadmium sulphate solution by well known means. This purification step does not counterbalance the great saving efiected by the increased rate of attack by the presence of metallic iron in the reaction mixture.
Description
Fatented Mar. 6, 1934 UNITED STATES PATENT QFFICE DISSGLVING CADMIUM METAL IN SUL- PHURIC ACID IN THE PRESENCE OF METALLIC IRON No Drawing. Application November 8, 1932, Serial No. 641,761
1 Claim.
The present invention relates to a process of dissolving metallic cadmium in hot, dilute sulphuric acid and is characterized by the fact that the operation is carried out in the presence of s metallic iron.
It is well known that ordinary commercial slabs of metallic cadmium or even feathered cadmium metal dissolve extremely slowly in hot, dilute sulphuric acid, as a matter of fact, I found for instance that only 6% of cadmium metal was dissolved when feathered cadmium was boiled for 18 hours in an excess of 20% sulphuric acid.
I have found that if metallic iron is present in the reaction mixture of sulphuric acid and 1 cadmium metal the rate of attack of the cadmium is considerably accelerated, whereas the iron is only dissolved to a small extent.
The following is an example of how I have operated my novel process:
I have, for instance, heated cadmium metal in boiling 20% sulphuric acid in which has been immersed a piece of sheet steel and found that in 48 hours 90 parts of cadmium metal were dissolved whereas only 6 parts of the iron had gone into solution.
Strange enough, I found also that iron salts, such as ferrous sulphate or other metals, such as copper, when present in the sulphuric acid do not materially affect the rate of attack of the sulphuric acid upon the cadmium metal.
The cadmium sulphate solution obtained according to my novel process contains small amounts of ferrous sulphate. This, however, can be removed from the cadmium sulphate solution by well known means. This purification step does not counterbalance the great saving efiected by the increased rate of attack by the presence of metallic iron in the reaction mixture.
I claim:
The process of dissolving cadmium metal which comprises boiling metallic cadmium and iron in dilute sulfuric acid solution.
HARRY P. CORSON.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US641761A US1949929A (en) | 1932-11-08 | 1932-11-08 | Dissolving cadmium metal in sulphuric acid in the presence of metallic iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US641761A US1949929A (en) | 1932-11-08 | 1932-11-08 | Dissolving cadmium metal in sulphuric acid in the presence of metallic iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1949929A true US1949929A (en) | 1934-03-06 |
Family
ID=24573737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US641761A Expired - Lifetime US1949929A (en) | 1932-11-08 | 1932-11-08 | Dissolving cadmium metal in sulphuric acid in the presence of metallic iron |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1949929A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2587022A1 (en) * | 1985-09-10 | 1987-03-13 | Rhone Poulenc Spec Chim | Process for the preparation of solutions of metals of low reducing ability |
-
1932
- 1932-11-08 US US641761A patent/US1949929A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2587022A1 (en) * | 1985-09-10 | 1987-03-13 | Rhone Poulenc Spec Chim | Process for the preparation of solutions of metals of low reducing ability |
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