DE523015C - Process for cleaning impure, especially chromium-containing titanium dioxide - Google Patents

Process for cleaning impure, especially chromium-containing titanium dioxide

Info

Publication number
DE523015C
DE523015C DED55466D DED0055466D DE523015C DE 523015 C DE523015 C DE 523015C DE D55466 D DED55466 D DE D55466D DE D0055466 D DED0055466 D DE D0055466D DE 523015 C DE523015 C DE 523015C
Authority
DE
Germany
Prior art keywords
titanium dioxide
containing titanium
chromium
especially chromium
cleaning
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
DED55466D
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.)
Auergesellschaft GmbH
Original Assignee
Auergesellschaft GmbH
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 Auergesellschaft GmbH filed Critical Auergesellschaft GmbH
Priority to DED55466D priority Critical patent/DE523015C/en
Application granted granted Critical
Publication of DE523015C publication Critical patent/DE523015C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
    • C01G23/00—Compounds of titanium
    • C01G23/04—Oxides; Hydroxides
    • C01G23/047—Titanium dioxide
    • C01G23/0475—Purification

Description

Verfahren zur Reinigung von unreinem, insbesondere ehromhaltigem Titandioxyd Bei der hydrolytischen Spaltung von Titanlösungen zwecks Ausfällung des Titandioxyds reißt dieses ,anwesende Verunreinigungen aus den Lösungen mit. Diese Verunreinigungen sind für die Titansäure schädlich, sobald sie die reine, weiße Farbe des Titandioxyds beeinträchtigen. Während es verhältnismäßig leicht ist, Bedingungen einzuhalten, um das Titandioxyd möglichst frei von Eisenoxyden zu fällen, hat das Titandioxyd gegenüber anderen, in kleinen Mengen vorhandenen farbigen Oxyden ein solches Aufnahmevermögen, und andererseits verursachen diese farbigen Oxyde eine so starke Färbung des Titandioxyds, daß man bei Anwesenheit dieser farbigen Oxyde nur unansehnliches Titandioxyd erhält. Neben Vanadin, Kupfer, Mangan ist das Chrom dasjenige Oxyd, das die Färbung des Titandioxyds am meisten beeinträchtigt.Process for the purification of impure titanium dioxide, in particular titanium dioxide containing oxy-gen In the hydrolytic cleavage of titanium solutions for the purpose of precipitating titanium dioxide pulls this, present impurities with it from the solutions. These impurities are harmful to titanic acid as soon as they become the pure, white color of titanium dioxide affect. While it is relatively easy to meet conditions, in order to precipitate the titanium dioxide as free of iron oxides as possible, the titanium dioxide has such an absorption capacity compared to other colored oxides present in small quantities, and on the other hand these colored oxides cause the titanium dioxide to be so strongly colored, that in the presence of these colored oxides only unsightly titanium dioxide is obtained. In addition to vanadium, copper and manganese, the chromium is the oxide that gives the Titanium dioxide most affected.

Um solches chromhaltiges Titandioxyd zu reinigen, verfährt man so, daß man das Titandioxyd mit einer kleinen Menge an Ätzalkali, Alkalicarbonat o. dgl. versetzt oder aber ein noch Säure enthaltendes Titandioxyd mit einem überschuß an Ätzalkali, Alkalicarbonat, Magnesiumoxyd, Bariumoxyd usw. mischt und die evtl. zuvor getrocknete Mischung glüht. Man kann den dabei verlaufenden Oxydationsprozeß des Chromoxyds zu Chromat durch Zusatz von Oxydationsmitteln beschleunigen. Das geglühte Produkt wird gemahlen und gewaschen, um es vom Alkali und Alkalichromat und evtl. anderen löslichen Salzen zu befreien. Die letzten noch am Titandioxyd evtl. anhaftenden Reste an Alkali können nachträglich durch Zusätze von Säuren oder anderen neutralisierenden Salzen, wie z. B. Aluminiumsulfat, Zinksulfat, neutralisiert und unschädlich gemacht werden. Zum Schluß wird das so gereinigte Titandioxyd getrocknet und evtl. mit anderen weißen Pigmenten gemischt.In order to clean such chromium-containing titanium dioxide, one proceeds as follows: that the titanium dioxide with a small amount of caustic alkali, alkali carbonate o. Like. Added or a titanium dioxide still containing acid with an excess of caustic alkali, alkali carbonate, magnesium oxide, barium oxide etc. previously dried mixture glows. You can see the process of oxidation accelerate the chromium oxide to chromate by adding oxidizing agents. That Annealed product is ground and washed to remove it from alkali and alkali chromate and possibly other soluble salts. The last still on the titanium dioxide Any residues of alkali that may have adhered can be subsequently removed by adding acids or other neutralizing salts, e.g. B. aluminum sulfate, zinc sulfate, neutralized and rendered harmless. Finally, the purified titanium dioxide is dried and possibly mixed with other white pigments.

Claims (1)

PATENTANSPRUCH: Verfahren zur Reinigung von unreinem, insbesondere chromhaltigem Titandioxyd, dadurch gekennzeichnet, daß man das Titandioxyd zur Überführung der in ihm enthaltenen Chromverbindungen in lösliche Alkalichromate mit einem kleinen überschuß an Alkali versetzt, evtl. trocknet, einem Glühprozeß unterwirft und das Glühprodukt auswäscht.PATENT CLAIM: Process for cleaning unclean, in particular chromium-containing titanium dioxide, characterized in that the titanium dioxide is used for conversion of the chromium compounds contained in it in soluble alkali chromates with a small excess alkali added, possibly dried, subjected to an annealing process and that Washes out glow product.
DED55466D 1928-04-15 1928-04-15 Process for cleaning impure, especially chromium-containing titanium dioxide Expired DE523015C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DED55466D DE523015C (en) 1928-04-15 1928-04-15 Process for cleaning impure, especially chromium-containing titanium dioxide

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED55466D DE523015C (en) 1928-04-15 1928-04-15 Process for cleaning impure, especially chromium-containing titanium dioxide

Publications (1)

Publication Number Publication Date
DE523015C true DE523015C (en) 1931-04-18

Family

ID=7056555

Family Applications (1)

Application Number Title Priority Date Filing Date
DED55466D Expired DE523015C (en) 1928-04-15 1928-04-15 Process for cleaning impure, especially chromium-containing titanium dioxide

Country Status (1)

Country Link
DE (1) DE523015C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1287236B (en) * 1957-11-16 1969-01-16 Bayer Ag Mixed crystals of titanium dioxide

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1287236B (en) * 1957-11-16 1969-01-16 Bayer Ag Mixed crystals of titanium dioxide

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