DE400422C - Extraction of sulphurous acid and lime from gypsum - Google Patents

Extraction of sulphurous acid and lime from gypsum

Info

Publication number
DE400422C
DE400422C DEW63262D DEW0063262D DE400422C DE 400422 C DE400422 C DE 400422C DE W63262 D DEW63262 D DE W63262D DE W0063262 D DEW0063262 D DE W0063262D DE 400422 C DE400422 C DE 400422C
Authority
DE
Germany
Prior art keywords
gypsum
lime
sulphurous acid
extraction
sulfhydrate
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
DEW63262D
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.)
BRUNO WAESER DR ING
Original Assignee
BRUNO WAESER DR ING
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 BRUNO WAESER DR ING filed Critical BRUNO WAESER DR ING
Priority to DEW63262D priority Critical patent/DE400422C/en
Application granted granted Critical
Publication of DE400422C publication Critical patent/DE400422C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/48—Sulfur dioxide; Sulfurous acid
    • C01B17/50—Preparation of sulfur dioxide
    • C01B17/501—Preparation of sulfur dioxide by reduction of sulfur compounds
    • C01B17/506—Preparation of sulfur dioxide by reduction of sulfur compounds of calcium sulfates

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Description

Gewinnung von schwefliger Säure und Kalk aus Gips. In den Patentschriften 307772, 3396I=, 347694 und 349347 ist ein zwischen + Io5o ° C und 1150 ' C vor sich gehendes Verfahren beschrieben, gemäß welchem man aus Gips und Schwefelcalcium Kalk und schweflige Säure gewinnt. Bei Nachprüfung dieses Verfahrens wurde gefunden, daß die Umsetzung viel leichter und ohne Zuschläge, Lufteinblasen oder Körnung vor sich geht, wenn man den Gips nicht mit dem Sulfid zur Reduktion bringt, sondern ihn vorher mit der wäßrigen Lösung des Sulfhydrats mischt. Eine homogene Mischung aus dem unlöslichen Sulfat und dem löslichen Sulfhydrat ist ohne weiteres herzustellen, wodurch schon rein mechanisch das Verfahren erleichtert wird. Man gelangt im Falle des Gipses z. B. bereits bei Temperaturen zwischen + 9oo ° C und + Iooo ° C unter Abspaltung der Gesamtmenge an schwefliger Säure zu einem sehr reinen Kalk. Außerordentlich wichtig ist der Ausschluß der Luft während der Reduktion, da sonst das Sulfhydrat bzw. Sulfid in nicht mehr reaktionsfähige Thiosulfate und höherwertige Schwefelverbindungen übergeht.Extraction of sulphurous acid and lime from gypsum. In the patents 307772, 3396I =, 347694 and 349347 is between + 10o5o ° C and 1150 ° C in front of it going process described, according to which one from gypsum and calcium sulphide lime and sulphurous acid wins. Upon review of this procedure, it was found that the implementation is much easier and without any surcharges, air blowing or grit before It's okay if you don't reduce the plaster of paris with the sulphide, but instead mixes it beforehand with the aqueous solution of the sulfhydrate. A homogeneous mixture from the insoluble sulfate and the soluble sulfhydrate can be easily produced, which in a purely mechanical way facilitates the process. One arrives in the event of gypsum z. B. already at temperatures between + 9oo ° C and + Iooo ° C below The total amount of sulphurous acid is split off to form a very pure lime. Extraordinary It is important to exclude air during the reduction, otherwise the sulfhydrate or sulphide into non-reactive thiosulphates and higher-value sulfur compounds transforms.

Claims (1)

PATENTANSPRUCH: Verfahren zur Gewinnung von schwefliger Säure und Kalk aus Gips und Schwefelcalcium, dadurch gekennzeichnet, daß man Gips vor Eintragung in den Ofen mit einer Lösung von Calciumsulfhydrat mischt evtl. brikettiert und nun bei Luftabschluß erhitzt. PATENT CLAIM: Process for the production of sulphurous acid and lime from gypsum and calcium sulphide, characterized in that gypsum is mixed with a solution of calcium sulfhydrate before it is introduced into the furnace, possibly briquetted and then heated with the exclusion of air.
DEW63262D 1923-02-24 1923-02-24 Extraction of sulphurous acid and lime from gypsum Expired DE400422C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEW63262D DE400422C (en) 1923-02-24 1923-02-24 Extraction of sulphurous acid and lime from gypsum

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEW63262D DE400422C (en) 1923-02-24 1923-02-24 Extraction of sulphurous acid and lime from gypsum

Publications (1)

Publication Number Publication Date
DE400422C true DE400422C (en) 1924-08-08

Family

ID=7606826

Family Applications (1)

Application Number Title Priority Date Filing Date
DEW63262D Expired DE400422C (en) 1923-02-24 1923-02-24 Extraction of sulphurous acid and lime from gypsum

Country Status (1)

Country Link
DE (1) DE400422C (en)

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