CH217476A - Process for the production of sodium aluminate from alkali aluminum silicates. - Google Patents
Process for the production of sodium aluminate from alkali aluminum silicates.Info
- Publication number
- CH217476A CH217476A CH217476DA CH217476A CH 217476 A CH217476 A CH 217476A CH 217476D A CH217476D A CH 217476DA CH 217476 A CH217476 A CH 217476A
- Authority
- CH
- Switzerland
- Prior art keywords
- lime
- production
- sodium
- alkali
- sodium aluminate
- Prior art date
Links
- 239000003513 alkali Substances 0.000 title claims description 9
- 238000000034 method Methods 0.000 title claims description 8
- 229910052782 aluminium Inorganic materials 0.000 title claims description 7
- -1 aluminum silicates Chemical class 0.000 title claims description 7
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 title claims description 5
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 229910001388 sodium aluminate Inorganic materials 0.000 title claims description 5
- 239000004571 lime Substances 0.000 claims description 11
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 8
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 7
- 229910001948 sodium oxide Inorganic materials 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 238000000137 annealing Methods 0.000 claims description 2
- 235000010210 aluminium Nutrition 0.000 claims 3
- 241000628997 Flos Species 0.000 claims 1
- 229910000323 aluminium silicate Inorganic materials 0.000 claims 1
- 235000012211 aluminium silicate Nutrition 0.000 claims 1
- 239000004744 fabric Substances 0.000 claims 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 7
- 150000004645 aluminates Chemical class 0.000 description 7
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 6
- 230000029087 digestion Effects 0.000 description 6
- 238000007792 addition Methods 0.000 description 5
- 229910000019 calcium carbonate Inorganic materials 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 229910052783 alkali metal Inorganic materials 0.000 description 3
- 235000012204 lemonade/lime carbonate Nutrition 0.000 description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- DNEHKUCSURWDGO-UHFFFAOYSA-N aluminum sodium Chemical compound [Na].[Al] DNEHKUCSURWDGO-UHFFFAOYSA-N 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 229910001634 calcium fluoride Inorganic materials 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 150000002222 fluorine compounds Chemical class 0.000 description 2
- 239000010436 fluorite Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 238000004131 Bayer process Methods 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 241001101998 Galium Species 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 241001676573 Minium Species 0.000 description 1
- 229910000288 alkali metal carbonate Inorganic materials 0.000 description 1
- 150000008041 alkali metal carbonates Chemical class 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229940043430 calcium compound Drugs 0.000 description 1
- 150000001674 calcium compounds Chemical class 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
- 235000012241 calcium silicate Nutrition 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- RAQDACVRFCEPDA-UHFFFAOYSA-L ferrous carbonate Chemical compound [Fe+2].[O-]C([O-])=O RAQDACVRFCEPDA-UHFFFAOYSA-L 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000004678 hydrides Chemical class 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 229910052907 leucite Inorganic materials 0.000 description 1
- 229910052664 nepheline Inorganic materials 0.000 description 1
- 239000010434 nepheline Substances 0.000 description 1
- KVOIJEARBNBHHP-UHFFFAOYSA-N potassium;oxido(oxo)alumane Chemical compound [K+].[O-][Al]=O KVOIJEARBNBHHP-UHFFFAOYSA-N 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 108700002400 risuteganib Proteins 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 150000003388 sodium compounds Chemical class 0.000 description 1
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
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Description
Verfahren zur Gewinnung von Natriumaluminat aus Alkalialuminiumsilikaten. Die Gewinnung von Alkalialuminat durch Sintern oder Schmelzen von Alkalia'luminium- eilikaten, wie z.
B. Leuzit, Nephelin, Feld- spath und dergleichen, mit einer für die Bin dung der Kieselsäure ausreichenden Menge Kalk oder Kalziumkarbonat und. nachfolgen- des Auslaugen :des gebildeten A'lkalialumina- tes, ist häufig versucht worden.
Zumeist wurde dabei durch Zuschlag von. 2 Mol. Ca0 oder CaC03 je Mol. Si02 im Ausgangss loff die Bildung von. Dikalziumsilikat 2Ca0 . Si02 angestrebt.
Zur Förderung der Umsetzung wurde verschiedentlich ein Zuschlag von Eisenkarbonat, Eisenoxyd oder CaF, als Flossmittel. vorgeschlagen. Die Umsetzungs- temperaturen lagen meistenu zwischen 1100 und 1300 C.
Neuerdings ist vorgeschlagen worden, den Aufschluss unter<B>1000'</B> C ohne Erreichung der Schmelztemperatur unter Zuschlag von Erdalkalifluoriden d!urchzufüh reu.
Anderseits bestehen Verfahren, nach denen der Aufschluss mit Kalk bezw. gal- ziumkarbonat und, Alkalioxyd oder A'lkali- karbanat, aber ohne Zusatz von besonderen Flossmitteln, durchgeführt wird.
Im Schrift tum werden für diese Verfahren Ausbeuten von S0-% Tonerde in Form von A'lkali6lumi- nat genannt.
Es ist interessant, festzustellen, dass die Ausbeute an Alkalialuminat nicht einfach mit zunehmender Temperaltur ;steigt; es. wird vielmehr in einem bestimmten Temperatur bereich- eine Höchstausbeute erzielt, die bei weiterer Temperaturerhöhung nicht verbes sert wird.
Es wurde nun gefunden:, dass bei gleboh- zeitiger Anwendung von Kalk oder Kalzium karbonat, von Alkalioxyd oder Alkalikarbo- nat und von einem Fluorid, Doppolflluorid oder Fluorid@gemisch., vorzugsweise Kalzium fluorid, die Ausbeute an Tonerde in Form. von Alkalialumin@at auf über 90% gesteigert werden kann.
Je nach den Ausgangsstoffen erhält man Natriumaluminat, galiumaluminat oder eine Mischung von Natrium- und Kialiumalumina- ten. Gegenstand des Patentes ist nun ein Ver fahren zur Gewinnung von Natriumaluminat, dadurch gekennzeichnet, dass man Alkali- aluminiumsilikate im Gemisch mit Kalk oder Kalk abgebenden Stoffen,
mit Natriumoxyd oder Natriumoxyd abgebenden Stoffen und mit Fluorid auf hohe Temperatur erhitzt und die erhaltene Masse auslaugt. Als Kalk ab gebende Stoffe eignen sich besonders Kal- ziumhydroxyd und Kalziumkarbonat. Als Stoffe, die Natriumoxyd ergeben, können Nalriumhydroxyd und Natriumkarbonat ver wendet werden.
Wesentlich ist die Verwen dung von solchen Kalzium- und Natrium- verbindungen, die sich bei der starken Er hitzung auf z. B. 800-1100' C wie Oxyde oder Karbonate verhalten. Am wirtschaft lichsten und. praktischsten ist die Verwen dung von Kalk oder Kalziumkarbonat und von Natriumkarbonat..
Eine Tonerdeausbeute von über <B>90%</B> ist praktisch nur erreichbar bei gleichzeitiger Anwesenheit von geeigneten Kalziumverbin- dungen, z. B. von Kalk, von geeigneten Na triumverbindungen, z. B. von. Soda (Natrium karbonat) und von Fl.uoriden, z.
B. Flussspat, in der Aufschlussmischung. Diese Ausbeute kann weder ohne Hinzufügung des zusätz- lichen Alkalis noch ohne die reaktionsför- dernde Wirkung des Fluorides, z. B. des Kalziumfluorides, erreicht werden.
Als für den Aufschluss besonders zweck mässig haben sich Zusätze von 2-2;5 32o1. Kalziumoxyd (bezw. -karbonat bezw. -hydr- ogyd) je Mol. Kieselsäure und von 0,8-l Mol. Soda je 31o1. A.lu.miniumoxyd im Aus- gangsmaterial erwiesen;
aL.s Fluoridzusatz genügt eine Menge von 1-2, % des Mischungs gen iehtes.
Das gebildete Aluminat kann beispiels- weise mit kaltem oder warmem Wasser oder auch mit einer schwachen Aluminatlauge ausgelaugt werden,.
Die Wirksamkeit des neuen Verfahrens lässt sich an folgendem Beispiel erkennen: Für den Aufschluss wurde ein Natrium aluminiumsilikat verwendet, wie es beim alkalischen Bauzitaufschluss nach dem Bayer- verfahren aus den Aluminailraugen erhalten wird und das fölgende Zusammensetzung hatte
EMI0002.0082
Na20 <SEP> 23a3%
<tb> AL20$ <SEP> 3,2,4%
<tb> S102 <SEP> 33a8 <SEP> %
<tb> H20 <SEP> 10,
4% 100 Gewichtsteile dieses Silikates wurden mit 79 Gewichtsteilen gebranntem Kalk, 26,9 Gewichtsteilen wasserfreier Sode,
und 4 Ge- wichrtstevlen Flussspat gemischt. Nach drei stündiger Erhitzung auf 060 C wurde die schwach gesinterte Glühmasse zerkleinert und mit 400 Gewichtsteilen Wasser von 80 C ausgelaugt.
Der abfiltrierte Rückstand wurde mehrmals mit warmem Wasser gewaschen. Das Filtrat enthielt 94,4% der Tonerde und 35,4% des Alkailis,des verwendeten Natrium- aluminiumklikates. Es wurde eine Aluminat- lauge erhalten,
die ungefähr 50 g A1208(1 und etwa 40 g Na2O/1 enthielt; der Kiesel- säuregehek der Lauge betrug ungefähr 2 der gelösten Tonerde, also etwa 1 gjl. Der grösste Teil dieser in Lösung gegangenen Kieselsäure schied sich bei eintägigem Stehen der Lauge wieder aus,
@so dass nach erneuter Filtrierung eine unmittelbare Verwendung der erhaltenen Aluminatlauge für die Ge winnung von. Tonerde möglich war.
Process for the production of sodium aluminate from alkali aluminum silicates. The production of alkali aluminate by sintering or melting of Alkalia'luminium- eilikaten such.
B. leucite, nepheline, feldspar and the like, with a sufficient amount of lime or calcium carbonate to bind the silica and. The subsequent leaching of the alkali metal formed has been tried frequently.
Most of the time, by surcharge of. 2 mol. Ca0 or CaC03 per mole. Si02 in the starting loff the formation of. Dicalcium silicate 2Ca0. Aimed at Si02.
To promote implementation, iron carbonate, iron oxide or CaF were added as rafts on various occasions. suggested. The conversion temperatures were mostly between 1100 and 1300 C.
It has recently been proposed to carry out the digestion below <B> 1000 '</B> C without reaching the melting temperature with the addition of alkaline earth fluorides.
On the other hand, there are methods according to which the digestion with lime BEZW. Galvanic carbonate and, alkali oxide or alkali metal carbanate, but without the addition of special fluids.
In the literature, yields of SO% clay in the form of alkali metal lumi- nate are mentioned for this process.
It is interesting to note that the yield of alkali aluminate does not simply increase with increasing temperature; it. rather, a maximum yield is achieved in a certain temperature range, which is not improved if the temperature is further increased.
It has now been found that when lime or calcium carbonate, alkali metal oxide or alkali metal carbonate and a fluoride, double fluoride or fluoride mixture, preferably calcium fluoride, are used at the same time, the yield of alumina is in the form. Alkalialumin @ ate can be increased to over 90%.
Depending on the starting materials, sodium aluminate, galium aluminate or a mixture of sodium and potassium aluminate is obtained. The subject of the patent is a process for the production of sodium aluminate, characterized in that alkali aluminum silicates are mixed with lime or lime-releasing substances,
with sodium oxide or sodium oxide releasing substances and heated to high temperature with fluoride and leaches the mass obtained. Calcium hydroxide and calcium carbonate are particularly suitable as lime-releasing substances. As substances that produce sodium oxide, sodium hydroxide and sodium carbonate can be used.
What is essential is the use of calcium and sodium compounds which, when exposed to strong heat, B. 800-1100 'C behave like oxides or carbonates. Most economical and. the most practical is to use lime or calcium carbonate and sodium carbonate ..
An alumina yield of over <B> 90% </B> is practically only achievable with the simultaneous presence of suitable calcium compounds, e.g. B. of lime, suitable Na trium compounds such. B. from. Soda (sodium carbonate) and fluorides, e.g.
B. fluorspar, in the digestion mixture. This yield can neither be achieved without the addition of the additional alkali nor without the reaction-promoting effect of the fluoride, e. B. calcium fluoride can be achieved.
Additions of 2-2; 5 32o1 have proven to be particularly useful for digestion. Calcium oxide (or carbonate or hydride) per mole of silica and from 0.8 to 1 mole of soda per 31o1. A.lu.minium oxide proven in the starting material;
As a result of the addition of fluoride, an amount of 1-2% of the mixture is sufficient.
The aluminate formed can be leached, for example, with cold or warm water or with a weak aluminate liquor.
The effectiveness of the new process can be seen in the following example: A sodium aluminum silicate was used for the digestion, as it is obtained from the aluminum lye in the alkaline bauxite digestion according to the Bayer process and which had the following composition
EMI0002.0082
Na20 <SEP> 23a3%
<tb> AL20 $ <SEP> 3.2.4%
<tb> S102 <SEP> 33a8 <SEP>%
<tb> H20 <SEP> 10,
4% of 100 parts by weight of this silicate were mixed with 79 parts by weight of quick lime, 26.9 parts by weight of anhydrous soda,
and 4 weighted fluorspar mixed. After three hours of heating at 060.degree. C., the weakly sintered annealing mass was comminuted and leached with 400 parts by weight of water at 80.degree.
The residue filtered off was washed several times with warm water. The filtrate contained 94.4% of the clay and 35.4% of the alkali, the sodium aluminum clicate used. An aluminate liquor was obtained,
which contained about 50 g A1208 (1 and about 40 g Na2O / 1; the silicic acid container of the lye was about 2 of the dissolved alumina, i.e. about 1 gjl. Most of this dissolved silicic acid separated out again when the lye stood for one day out,
@so that after renewed filtration, the aluminate liquor obtained can be used immediately for the recovery of. Alumina was possible.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH217476T | 1939-11-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH217476A true CH217476A (en) | 1941-10-31 |
Family
ID=4450138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH217476D CH217476A (en) | 1939-11-25 | 1939-11-25 | Process for the production of sodium aluminate from alkali aluminum silicates. |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH217476A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1112055B (en) * | 1956-10-24 | 1961-08-03 | Aluminium Lab Ltd | Process for cleaning aluminum oxide |
| DE1132103B (en) * | 1956-10-24 | 1962-06-28 | Aluminium Lab Ltd | Process for cleaning aluminum oxide |
| CN110697747A (en) * | 2019-12-03 | 2020-01-17 | 山东齐鲁华信实业股份有限公司 | High-efficiency production method of low-caustic-ratio sodium metaaluminate solution |
-
1939
- 1939-11-25 CH CH217476D patent/CH217476A/en unknown
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1112055B (en) * | 1956-10-24 | 1961-08-03 | Aluminium Lab Ltd | Process for cleaning aluminum oxide |
| DE1132103B (en) * | 1956-10-24 | 1962-06-28 | Aluminium Lab Ltd | Process for cleaning aluminum oxide |
| CN110697747A (en) * | 2019-12-03 | 2020-01-17 | 山东齐鲁华信实业股份有限公司 | High-efficiency production method of low-caustic-ratio sodium metaaluminate solution |
| CN110697747B (en) * | 2019-12-03 | 2022-05-13 | 山东齐鲁华信实业股份有限公司 | High-efficiency production method of low-caustic-ratio sodium metaaluminate solution |
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