CH181527A - Process for the production of pure chromium hydroxide from impure chromium sulfate solutions. - Google Patents
Process for the production of pure chromium hydroxide from impure chromium sulfate solutions.Info
- Publication number
- CH181527A CH181527A CH181527DA CH181527A CH 181527 A CH181527 A CH 181527A CH 181527D A CH181527D A CH 181527DA CH 181527 A CH181527 A CH 181527A
- Authority
- CH
- Switzerland
- Prior art keywords
- chromium
- chromium sulfate
- sulfate
- basic
- impure
- Prior art date
Links
- GRWVQDDAKZFPFI-UHFFFAOYSA-H chromium(III) sulfate Chemical compound [Cr+3].[Cr+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRWVQDDAKZFPFI-UHFFFAOYSA-H 0.000 title claims description 15
- 238000000034 method Methods 0.000 title claims description 10
- VQWFNAGFNGABOH-UHFFFAOYSA-K chromium(iii) hydroxide Chemical compound [OH-].[OH-].[OH-].[Cr+3] VQWFNAGFNGABOH-UHFFFAOYSA-K 0.000 title claims description 8
- 238000004519 manufacturing process Methods 0.000 title description 4
- 239000011651 chromium Substances 0.000 claims description 11
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 9
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- 239000011696 chromium(III) sulphate Substances 0.000 claims description 7
- 235000015217 chromium(III) sulphate Nutrition 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- DSHWASKZZBZKOE-UHFFFAOYSA-K chromium(3+);hydroxide;sulfate Chemical compound [OH-].[Cr+3].[O-]S([O-])(=O)=O DSHWASKZZBZKOE-UHFFFAOYSA-K 0.000 claims description 6
- 229910000356 chromium(III) sulfate Inorganic materials 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000012895 dilution Substances 0.000 claims description 2
- 238000010790 dilution Methods 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 150000001447 alkali salts Chemical class 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 229910000358 iron sulfate Inorganic materials 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G37/00—Compounds of chromium
- C01G37/02—Oxides or hydrates thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Description
Verfahren zur Gewinnung von reinem Chromihydroayd aus uni-einen Chromisulfatlösungen. Die Erfindung bezieht sich auf ein Ver fahren zur Herstellung von reinem Chromi- hydroxyd aus unreinen Chromisulfatlösun- gen.
Das Verfahren ist dadurch gekennzeich net, dass das Chromisulfat in der unreinen Lösung durch säurebindende Stoffe in ba sisches Chromisulfat übergeführt und daraus nach Verdünnen und Erhitzen hydrolytisch reines Chromihydroxyd abgeschieden wird. Das Verfahren ist besonders geeignet, uaii das Chrom aus eisensulfathaltigen Chrom sulfatlösungen abzuscheiden, wie sie bei der Verarbeitung armer Chromerze auf Ferro- chrom und Lösen desselben in Schwefelsäure erhalten werden.
Als säurebindende Stoffe zur Überfüh rung des Chromisulfates in basisches Chromi- sulfat können feinverteilte Metalle, insbeson dere Chrom, Eisen, ferner Chromihydroxycl, das immer wieder in den Betrieb zurück- kehrt, Calciumkarbonat und unter Umstän den gewöhnliche Alkalien verwendet werden. <I>Beispiel:</I> Eine unreine Chromisulfatlösung (Cr, [SOJ j von 41 B6 wird auf 108 C erwärmt.
Die ser Lösung wird eine grosse Menge fein zer teiltes Chrommetall zugemischt. Die zuzu führende Chrommenge kann berechnet wer den, sie wird zweckmässig einen kleinen Überschuss über den Betrag bilden, der not wendig ist, um einen Teil der Schwefelsäure, die im Chromsulfat enthalten ist, aufzuneh men und aus letzterem ein basisches Salz - Cr2(S04), (0H)2 zu bilden. Eventuell kann auch ein grösserer Teil der Schwefelsäure aufgenommen und somit das basische Salz Cr2(S0-,) (OH),, gebildet werden.
Durch Rühren bei einer Temperatur von über<B>100'</B> C wird die normale Chromsulfat lösung das Chrom auflösen und eines der ge nannten basischen Salze bilden, je nach der vorhandenen Chrommenge. Um ein sehr ba sisches Salz zu bilden, ist es notwendig, das Erwärmen zu verlängern und/oder eine hohe Temperatur zu benutzen, die zum Beispiel wesentlich über<B>100'</B> C liegt.
Das basische Chromsulfat, das wie oben beschrieben erzeugt worden ist, kann ohne weiteres hydrolysiert werden durch Einfüh ren von Dampf nach Zusatz von kaltem Wasser und/oder durch Wärmen und Ver dünnen der Lösungen. Die Hydrolyse veran lasst das Ausfällen des Chromihydroxydes, Cr(OH)3.
Bei Benutzung von fein zerteiltem Eisen können dieselben Mengen, Temperaturen und Konzentrationen angewendet werden, wie oben für die Anwendung von fein zerteiltem Chrom beschrieben.
Sehr zweckmässig zur Erzeugung des ba sischen Chromisulfates ist die Verwendung von Chromihydroxyd aus dem Betrieb, da dadurch kein Fremdstoff hereingebracht wird, wie es bei Anwendung von Calcium- karbonat der Fall ist.
Process for the production of pure chromium hydroxide from uni-one chromium sulfate solutions. The invention relates to a process for the production of pure chromium hydroxide from impure chromium sulfate solutions.
The process is characterized in that the chromium sulfate in the impure solution is converted into basic chromium sulfate by acid-binding substances and hydrolytically pure chromium hydroxide is separated from it after dilution and heating. The process is particularly suitable for separating the chromium from iron sulfate-containing chromium sulfate solutions, such as those obtained when processing poor chromium ores on ferro-chromium and dissolving them in sulfuric acid.
The acid-binding substances used to convert the chromium sulfate into basic chromium sulfate are finely divided metals, in particular chromium, iron, and also chromium hydroxyl, which keeps returning to the plant, calcium carbonate and, under certain circumstances, common alkalis. <I> Example: </I> An impure chromium sulfate solution (Cr, [SOJ j of 41 B6 is heated to 108 C.
A large amount of finely divided chromium metal is mixed into this solution. The amount of chromium to be added can be calculated; it will expediently form a small excess over the amount necessary to absorb some of the sulfuric acid contained in the chromium sulfate and to convert the latter into a basic salt - Cr2 (S04) To form (0H) 2. A larger part of the sulfuric acid can possibly also be absorbed and thus the basic salt Cr2 (S0-,) (OH) ,, can be formed.
By stirring at a temperature of more than <B> 100 '</B> C, the normal chromium sulfate solution will dissolve the chromium and form one of the basic salts mentioned, depending on the amount of chromium present. In order to form a very basic salt it is necessary to prolong the heating and / or use a high temperature, for example significantly above <B> 100 '</B> C.
The basic chromium sulfate produced as described above can be readily hydrolyzed by introducing steam after adding cold water and / or by heating and diluting the solutions. The hydrolysis causes the precipitation of chromium hydroxide, Cr (OH) 3.
When using finely divided iron, the same amounts, temperatures and concentrations can be used as described above for the use of finely divided chromium.
The use of chromium hydroxide from the plant is very useful for the production of basic chromium sulphate, since it does not bring in any foreign matter, as is the case when using calcium carbonate.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH181527T | 1934-08-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH181527A true CH181527A (en) | 1935-12-31 |
Family
ID=4430869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH181527D CH181527A (en) | 1934-08-14 | 1934-08-14 | Process for the production of pure chromium hydroxide from impure chromium sulfate solutions. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH181527A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2493297A1 (en) * | 1980-08-05 | 1982-05-07 | Outokumpu Oy | PROCESS FOR THE PRODUCTION OF AN IRON FREE CHROME III COMPOUND |
-
1934
- 1934-08-14 CH CH181527D patent/CH181527A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2493297A1 (en) * | 1980-08-05 | 1982-05-07 | Outokumpu Oy | PROCESS FOR THE PRODUCTION OF AN IRON FREE CHROME III COMPOUND |
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