CH141013A - Process for the removal of iron from bauxites and other aluminous ores. - Google Patents
Process for the removal of iron from bauxites and other aluminous ores.Info
- Publication number
- CH141013A CH141013A CH141013DA CH141013A CH 141013 A CH141013 A CH 141013A CH 141013D A CH141013D A CH 141013DA CH 141013 A CH141013 A CH 141013A
- Authority
- CH
- Switzerland
- Prior art keywords
- iron
- hydrochloric acid
- bauxites
- removal
- ores
- Prior art date
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims description 23
- 229910052742 iron Inorganic materials 0.000 title claims description 11
- 238000000034 method Methods 0.000 title claims description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 13
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 5
- 229910052801 chlorine Inorganic materials 0.000 claims description 5
- 239000000460 chlorine Substances 0.000 claims description 5
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 235000013980 iron oxide Nutrition 0.000 description 2
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 229920001342 Bakelite® Polymers 0.000 description 1
- 229920001875 Ebonite Polymers 0.000 description 1
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000004637 bakelite Substances 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- BUACSMWVFUNQET-UHFFFAOYSA-H dialuminum;trisulfate;hydrate Chemical compound O.[Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O BUACSMWVFUNQET-UHFFFAOYSA-H 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 229960002089 ferrous chloride Drugs 0.000 description 1
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
Landscapes
- Inorganic Compounds Of Heavy Metals (AREA)
Description
Procédé pour l'élimination du fer contenu dans les bauxites et autres minerais alumineux. Le procédé qui fait l'objet de la présente invention a pour but d'enlever à la bauxite ferrugineuse et autres minerais alumineux et ferrugineux, les oxydes de fer qui gênent pour l'obtention facile d'alumine ou de sels d'aluminium suffisamment purs et exempts de fer.
Selon ce procédé, le minerai alumineux et ferrugineux est traité entre 150 et 500 C par un courant gazeux formé au moins par tiellement d'acide chlorhydrique et tel que le fer contenu dans le minerai soit éliminé à l'état de chlorure ferrique. L'acide chlorhy drique pourra être additionné de chlore libre si les minerais renferment du fer à l'état minimum d'oxydation et n'ont pas subi un grillage oxydant préalable.
De préférence, on procède comme suit: Le minerai alumineux et ferrugineux, finement pulvérisé, est placé dans une cornue ou appareil équivalent où l'on fait passer au moyen d'un exhausteur, un courant rapide du gaz de traitement.
Le fer forme du perchlorure qui se vola tilise et qui est entraîné par le courant ga zeux. L'alumine, la silice libre et les silicates restent dans la cornue.
Les gaz chargés de perchlorure de fer sont dirigés au sortir de la cornue dans une série de tours en lave de Volvic par exemple, dont le remplissage est arrosé de façon con tinue au moyen d'acide sulfurique. Le lavage des gaz par l'acide sulfurique a pour effet: 1 de les refroidir et de les dessécher, ce qui diminue leur puissance d'attaque contre les matériaux constitutifs des appareils; 2 de décomposer le perchlorure de fer en donnant du sulfate ferrique non volatil, qui reste dissous dans l'excès d'acide, et de l'acide chlorhydrique gazeux qui rentre en circulation.
Le lavage des gaz est méthodique, l'acide de la tour de sortie est remonté dans la seconde tour, et ainsi de suite jusqu'à la tour d'entrée. On retire l'acide sulfurique dés qu'il est suffisamment chargé en sulfate ferrique.
A leur sortie des tours, les gaz, sensi blement refroidis, sont envoyés dans un gazo mètre revêtu d'un vernis inattaquable (ébo nite, bakélite, etc.) et plongeant dans l'huile de pétrole. De ce gazomètre, les gaz sont repris par l'exhausteur et remis en circula tion.
Si les minerais traités renferment du fer à l'état minimum d'oxydation et n'ont pas subi titi grillage oxydant préalable, l'acide chlorhydrique formerait du chlorure ferreux peu volatil aux températures indiquées et qui souillerait l'alumine obtenue. On évite cet inconvénient cri ajoutant du chlore libre à l'acide chlorhydrique de traitement. On doit alors prévoir une alimentation en chlore pour compenser la baisse de teneur du mélange gazeux en, chlore en cours d'opération.
Les matières alumineuses, débarrassées des oxydes de fer, sont recueillies, puis trai tées suivant les procédés connus pour la fabrication du sulfate d'aluminium ou d'un autre sel d'aluminium.
Process for the removal of iron from bauxites and other aluminous ores. The object of the process which is the subject of the present invention aims to remove from ferruginous bauxite and other aluminous and ferruginous ores, iron oxides which interfere with the easy production of alumina or sufficiently pure aluminum salts. and free of iron.
According to this process, the aluminous and ferruginous ore is treated between 150 and 500 ° C. with a gas stream formed at least by tiellement hydrochloric acid and such that the iron contained in the ore is removed in the form of ferric chloride. The hydrochloric acid may be added with free chlorine if the ores contain iron in the minimum state of oxidation and have not undergone prior oxidative roasting.
Preferably, the procedure is as follows: The finely pulverized aluminous and ferruginous ore is placed in a retort or equivalent apparatus whereby a rapid stream of the treatment gas is passed by means of an enhancer.
The iron forms perchloride which flies away and is carried away by the gas current. Alumina, free silica and silicates remain in the retort.
The gases charged with iron perchloride are directed on leaving the retort into a series of lava towers from Volvic, for example, the filling of which is continuously sprayed with sulfuric acid. The washing of gases with sulfuric acid has the effect of: 1 cooling and drying them, which reduces their attack power against the constituent materials of the apparatus; 2 to decompose the perchloride of iron giving non-volatile ferric sulphate, which remains dissolved in the excess acid, and gaseous hydrochloric acid which returns to circulation.
The gas washing is methodical, the acid from the exit tower is returned to the second tower, and so on up to the entrance tower. Sulfuric acid is removed as soon as it is sufficiently charged with ferric sulfate.
On leaving the towers, the gases, significantly cooled, are sent into a gas meter coated with an unassailable varnish (ebonite, bakelite, etc.) and immersed in petroleum oil. From this gasometer, the gases are taken up by the exhauster and put back into circulation.
If the treated ores contain iron in the minimum state of oxidation and have not undergone a prior oxidative roasting, hydrochloric acid would form ferrous chloride of low volatility at the temperatures indicated and which would soil the alumina obtained. This drawback is avoided by adding free chlorine to the treatment hydrochloric acid. A chlorine supply must then be provided to compensate for the drop in the chlorine content of the gas mixture during operation.
The aluminous materials, freed from iron oxides, are collected and then treated according to known methods for the manufacture of aluminum sulphate or of another aluminum salt.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR141013X | 1928-02-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH141013A true CH141013A (en) | 1930-07-15 |
Family
ID=8874655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH141013D CH141013A (en) | 1928-02-15 | 1929-02-13 | Process for the removal of iron from bauxites and other aluminous ores. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH141013A (en) |
-
1929
- 1929-02-13 CH CH141013D patent/CH141013A/en unknown
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