DE874298C - Process for the processing of the waste water resulting from the digestion of raw bleaching earth with hydrochloric acid - Google Patents
Process for the processing of the waste water resulting from the digestion of raw bleaching earth with hydrochloric acidInfo
- Publication number
- DE874298C DE874298C DES4191D DES0004191D DE874298C DE 874298 C DE874298 C DE 874298C DE S4191 D DES4191 D DE S4191D DE S0004191 D DES0004191 D DE S0004191D DE 874298 C DE874298 C DE 874298C
- Authority
- DE
- Germany
- Prior art keywords
- hydrochloric acid
- raw
- digestion
- waste water
- bleaching earth
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/34—Preparation of aluminium hydroxide by precipitation from solutions containing aluminium salts
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Description
Verfahren zur Aufarbeitung der beim Aufschluß von Rohbleicherde mit Salzsäure anfallenden Abwässer Beim Aufschluß von Rohbleicherde mit Salzsäure fallen große Mengen Salz.säureabwasser an, die bisher nicht verwertet werden konnten, im Gegenteil, die, ,da sie vor der Ableitung in Gewässer neutralisiert werden[ müssen, ohne Ver-,vertungsmöglichkeit Unkosten verursachten. Esi ist zwar bereits bekannt, derartige saure Abwässer zu verwerten, aber dieser Vorschlag scheidet aus Wirtschaftlichkeitsgründ en aus, denn die Aufarbeitung erfolgt mit Hilfe von calcinierter, aus Abwässern gewonnener Tonerde unter gleichzeitiger Verwendung schwefelsaurer Abwässer. Der Calcinierungsprozeß, der im Kreislauf durchgeführt wird, erfordert besondere Anlagen, und schwefelsaure Abwässer stehen in der Regel nicht zur Verfügung. Die der Erfindung zugrunde liegende Aufgabe besteht darin., einen Weg zur Aufarbeitung der Ablaugen zu finden, der wenig kostspielig ist und geringe Investitutionskosten bedarf und der vor allen Dingen auch ein Nebenprodukt gewinnen läßt, für das Absatzmöglichkeit vorhanden ist.Process for working up with the digestion of raw bleaching earth Hydrochloric acid accumulating wastewater When digesting raw bleaching earth with hydrochloric acid fall large amounts of hydrochloric acid wastewater that could not previously be recycled in the On the contrary, since they have to be neutralized before being discharged into water incurred expenses without the possibility of misrepresentation. Esi is already known to recycle such acidic wastewater, but this proposal ruled out for reasons of economy en, because the work-up takes place with the help of calcined, from waste water obtained alumina with simultaneous use of sulfuric acid waste water. Of the Calcination process, which is carried out in the circuit, requires special equipment, and sulfuric acid wastewater are usually not available. That of the invention The underlying task is to find a way to work up the waste liquors to find that is inexpensive and requires low investment costs and which above all also allows a by-product to be gained for the sales opportunity is available.
Gelöst ist .diese Aufgabe dadurch, daß man aus den Abwässern gelfärmigeAluminiumv erbindungen in an sich bekannter Weise mit Alkalien ausfällt.This problem is solved by removing gel-like aluminum from the wastewater erbindungen precipitates in a manner known per se with alkalis.
Dieses Verfahren erfordert keinem Calcinnerungsprozeß und auch keine schwefelsauren Abwässer, so daß es zur Durchführung in Betrieben, die Roherde mit Salzsäure aufschließen,, sehr geeignet ist.This method does not require a calcination process and neither does any sulfuric acid waste water, so that it can be carried out in plants that use raw earth Dissolve hydrochloric acid, is very suitable.
Darüber hinaus sind. die für, die Ausfällung erforderlichen Fällungsmittel, nämlich in erster Linie das Calciumcarbonat, äußerst billig und stehen in genügender Menge zur Verfügung.In addition, are. the precipitants required for the precipitation, namely in the first place the calcium carbonate, extremely cheap and are available in sufficient quantities.
Freilich ist das Ausfällen von Aluminiurnhydroxyd aus wäßri,gen Aluminiumverbindungen bekannt, aber man konnte nicht voraussehen, daß sich aus den sehr verdünnten Abwässern das Aluminiumhydroxydgel ausfällen: läßt, denn nach bisheriger Auffassung fällt aus stark verdünntem Lösungen das Aluminium in Form einer Doppelverbindung, aus.Of course, the precipitation of aluminum hydroxide from aqueous aluminum compounds is possible known, but one could not foresee that from the very dilute sewage the aluminum hydroxide gel precipitates: lets, because according to the previous view falls from highly diluted solutions the aluminum in the form of a double compound.
Ausführungsbe..ispiel 125o 1 Abwasser mit einem spezifischen Gewicht von 1,072 und einem Gehalt von 2,o3 0%A12 03, 0,530/0 Fee 03, 0,490/0- Ca O, 0,52,010 Mg O in Form von Chloriden und 0,170/0 Si 02 werden mit 45001 Wasser vermischt. Diese verdünnte Lösung wird bei einer Temperatur von 7° unter Rühren innerhalb 35 Minuten mit einer Aufschlämmung von 88,2 kg kohlensaurem Kalk in 68o 1 Wasser versetzt. Nach Filtration, Auswaschen und Trocknen. der Fällung erhält man 83,7 kg Gel mit einem Wassergehalt von 4,2°/o und einem Gehalt an A1203 von 31,0i 0%.Example 125o 1 wastewater with a specific weight of 1.072 and a content of 2.03 0% A12 03, 0.530 / 0 Fee 03, 0.490 / 0- Ca O, 0.52.010 Mg O in the form of chlorides and 0.170 / 0 Si 02 are mixed with 45001 water. A slurry of 88.2 kg of carbonate of lime in 680 l of water is added to this dilute solution at a temperature of 7 ° with stirring over the course of 35 minutes. After filtration, washing and drying. the precipitation gives 83.7 kg of gel with a water content of 4.2% and an A1203 content of 31.0%.
Calciumcarbonat wird in frisch gefällter Form verwendet. Es kann aber auch auf sonstige Weise aktiviertes Calciumcarbonat zur Anwendung kommen, z. B. (einst gemahlenes.Calcium carbonate is used in freshly precipitated form. But it can calcium carbonate activated in other ways can also be used, e.g. B. (once ground.
Die Ausfällung kann mit beliebigen alkalischen Stoffen erfolgen. In technischer Beziehung eignet sich am besten Calciumcarbonat.The precipitation can take place with any alkaline substance. In technical relationship is best calcium carbonate.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES4191D DE874298C (en) | 1941-12-23 | 1941-12-23 | Process for the processing of the waste water resulting from the digestion of raw bleaching earth with hydrochloric acid |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES4191D DE874298C (en) | 1941-12-23 | 1941-12-23 | Process for the processing of the waste water resulting from the digestion of raw bleaching earth with hydrochloric acid |
Publications (1)
Publication Number | Publication Date |
---|---|
DE874298C true DE874298C (en) | 1953-04-23 |
Family
ID=7470529
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DES4191D Expired DE874298C (en) | 1941-12-23 | 1941-12-23 | Process for the processing of the waste water resulting from the digestion of raw bleaching earth with hydrochloric acid |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE874298C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4306663A1 (en) * | 1993-03-03 | 1994-09-08 | Sued Chemie Ag | Process for the environmentally friendly utilization of acid wastewater |
-
1941
- 1941-12-23 DE DES4191D patent/DE874298C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4306663A1 (en) * | 1993-03-03 | 1994-09-08 | Sued Chemie Ag | Process for the environmentally friendly utilization of acid wastewater |
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