DE355738C - Process for the digestion of difficult to attack minerals or oxides - Google Patents

Process for the digestion of difficult to attack minerals or oxides

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Publication number
DE355738C
DE355738C DEF44895D DEF0044895D DE355738C DE 355738 C DE355738 C DE 355738C DE F44895 D DEF44895 D DE F44895D DE F0044895 D DEF0044895 D DE F0044895D DE 355738 C DE355738 C DE 355738C
Authority
DE
Germany
Prior art keywords
alkali
oxides
sodium
minerals
digestion
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
Application number
DEF44895D
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer AG
Original Assignee
Farbenfabriken Vorm Friedr Bayer and Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Farbenfabriken Vorm Friedr Bayer and Co filed Critical Farbenfabriken Vorm Friedr Bayer and Co
Priority to DEF44895D priority Critical patent/DE355738C/en
Application granted granted Critical
Publication of DE355738C publication Critical patent/DE355738C/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G1/00—Methods of preparing compounds of metals not covered by subclasses C01B, C01C, C01D, or C01F, in general
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G25/00—Compounds of zirconium

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Cosmetics (AREA)

Description

Wie bekannt, werden viele Mineralien oder technisch gewonnene Oxyde aufgeschlossen, indem man sie mit Soda, Pottasche, Gemischen beider, eventuell unter Zusatz von gewissen Salzen, wie Salpeter, oder häufig auch mit Ätzalkalien schmilzt. Manche Stoffe werden selbst mit diesen Agentien nur schwer oder unvollständig aufgeschlossen. Erwähnt seien.in dieser Richtung Mineralien, wie Zirkon, Rutil, Titanit, Monazit, Bauxit, Turmalin u. a. sowie die Zirkonerde.As is known, many minerals or technically obtained oxides are digested, by mixing them with soda, potash, mixtures of both, possibly with the addition of certain salts, such as saltpetre, or often with caustic alkalis, melts. Some fabrics are only unlocked with difficulty or incompletely even with these agents. Mentioned be.in this direction minerals such as zircon, rutile, titanite, monazite, bauxite, tourmaline i.a. as well as the zirconia.

Es wurde nun gefunden, daß der Aufschluß in solchen Fällen vollständig, in kürzester Zeit und bei relativ niederer Temperatur verläuft, wenn man das Schmelzen mit Alkalihydroxyd bei Gegenwart von Alkalioxyd, wie Natriumoxyd oder Kaliumoxyd, vornimmt. Diese wesentliche Erleichterung der Reaktion beruht wahrscheinlich darauf, daß unter diesen Umständen eine einfache Addition des Alkalioxydes an das Säureanhydrid oder das saure Metalloxyd eintritt, während bei Anwendung von nur Alkalihydroxyd oder Alkalicarbonat nebenher Wasser oder Kohlensäure abgespalten wird:It has now been found that the digestion in such cases is complete, in the shortest possible time Time and at a relatively low temperature passes if you do the melting with alkali hydroxide in the presence of alkali oxide such as sodium oxide or potassium oxide. This essential facilitation of the response is probably based on the fact that under these circumstances a simple addition of the Alkali oxide enters the acid anhydride or acidic metal oxide while using from only alkali hydroxide or alkali carbonate, water or carbonic acid is split off at the same time:

SiO2 + Na2O = Na2SiO3 (analog TiO2, ZrO2, Al2O3) /SiO2 + 2 NaOH = Na2SiO3H-H2O I SiO2 + Na2CO3 = Na2SiO3+ CO2.SiO 2 + Na 2 O = Na 2 SiO 3 (analogous to TiO 2 , ZrO 2 , Al 2 O 3 ) / SiO 2 + 2 NaOH = Na 2 SiO 3 HH 2 O I SiO 2 + Na 2 CO 3 = Na 2 SiO 3 + CO 2 .

so Das wirksame Schmelzmittel stellt man sich entweder durch Mischern von Ätzalkali mit Alkalioxyd her oder durch Eintragen von metallischem Kalium oder Natrium in geschmolzenes wasserfreies Ätzalkali. Behandeltso The effective flux is provided either by mixing caustic alkali with alkali oxide or by adding metallic potassium or sodium in molten anhydrous caustic alkali. Treated

as man die Schmelze mit Wasser, so gehen Stoffe, wie Kieselsäure, Aluminiumoxyd, Zinkoxyd, Berylliumoxyd, die saure Eigenschaften besitzen, in die alkalische Losung, während nicht saure oder schwach saure, wie Metalloxyde, Titansäure, Zirkondioxyd, Thorerde u. a., ungelöst bleiben. Letztere sind nunas you melt the water, so go Substances such as silica, aluminum oxide, zinc oxide, beryllium oxide, have acidic properties have, in the alkaline solution, while non-acidic or weakly acidic, such as metal oxides, titanic acid, zirconium dioxide, thore earth inter alia, remain unresolved. The latter are now

Beispiel.Example.

In ι bis 2 kg geschmolzenes wasserfreies Ätznatron trägt man 0,3 bis 0,4 kg Natriumoxyd ein und versetzt dann unter Umrühren mit 0,3 kg feinst gepulvertem Rutil. Nachdem man etwa eine Viertelstunde im Schmelzfluß gehalten hat, gießt man die SchmelzeIn ι to 2 kg of molten anhydrous caustic soda one carries 0.3 to 0.4 kg of sodium oxide and then add 0.3 kg of finely powdered rutile while stirring. After this one has held in the melt flow for about a quarter of an hour, the melt is poured

aber durch die Schmelze in verdünnten Säuren löslich geworden, d. h. aufgeschlossen. Die Schmelzen verlaufen eine wie die andere.but has become soluble in dilute acids through the melt, d. H. open minded. The melts are one like the other.

Claims (1)

aus und erwärmt sie mit etwa 20 1 Wasser, Sobald alles Natrium gelöst ist, trägt man wieand heats them with about 20 liters of water. As soon as all the sodium is dissolved, you wear like wobei die. Titansäure ungelöst bleibt und ' oben 0,3 kg Rutil ein und verfährt sonstwiewhere the. Titanic acid remains undissolved and 'above 0.3 kg of rutile and otherwise proceeds durch Dekantieren und Filtrieren gewonnen oben.obtained by decanting and filtering above. wird. Sie ist in Salzsäure vollkommen löslich Es können auch Gemische der Ätzalkalienwill. It is completely soluble in hydrochloric acid. Mixtures of caustic alkalis can also be used geworden und kann in bekannter Weise von und auch solche der Alkalioxyde verwendetand can be used in a known manner by and also those of the alkali oxides Verunreinigungen getrennt werden. werden.Impurities are separated. will. Das Gemisch von Ätznatron und Natrium- -da oxyd kann man sich auch in folgender Weise i Patent-Anspruch: herstellen: In 1 bis 2 kg geschmolzenes I Verfahren zur Aufschließung von wasserfreies Ätznatron trägt man allmählich : schwer, angreifbaren Mineralien oder ο, ι bis 0,2 kg metallisches Natrium ein, wo- : Oxyden, gekennzeichnet durch die Anbei der entwickelte Wasserstoff in ruhiger ; Wendung einer Mischung von Alkali-Weise an der öffnung des Tiegels verbrennt. , hydroxyd und Alkalioxyd.The mixture of caustic soda and sodium -da Oxyd can also be produced in the following way: In 1 to 2 kg of molten I process for the digestion of Anhydrous caustic soda you wear gradually: difficult, vulnerable minerals or ο, ι up to 0.2 kg of metallic sodium, where: oxides, indicated by the attached the evolved hydrogen in calm; Twist of a mixture of alkali ways burns at the opening of the crucible. , hydroxide and alkali oxide. BKRUN. UH)RVCRT IN DER RElCHSDliUCKEREL .BKRUN. UH) RVCRT IN DER RElCHSDliUCKEREL.
DEF44895D 1919-07-12 1919-07-12 Process for the digestion of difficult to attack minerals or oxides Expired DE355738C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEF44895D DE355738C (en) 1919-07-12 1919-07-12 Process for the digestion of difficult to attack minerals or oxides

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF44895D DE355738C (en) 1919-07-12 1919-07-12 Process for the digestion of difficult to attack minerals or oxides

Publications (1)

Publication Number Publication Date
DE355738C true DE355738C (en) 1922-07-01

Family

ID=7100253

Family Applications (1)

Application Number Title Priority Date Filing Date
DEF44895D Expired DE355738C (en) 1919-07-12 1919-07-12 Process for the digestion of difficult to attack minerals or oxides

Country Status (1)

Country Link
DE (1) DE355738C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1294947B (en) * 1962-05-08 1969-05-14 Degussa Process for opening up zircon sand

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1294947B (en) * 1962-05-08 1969-05-14 Degussa Process for opening up zircon sand

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