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DE465927C - Process for the production of calcium bisulfite lye from phosphate-containing chalks - Google Patents

Process for the production of calcium bisulfite lye from phosphate-containing chalks

Info

Publication number
DE465927C
DE465927C DEH104971D DEH0104971D DE465927C DE 465927 C DE465927 C DE 465927C DE H104971 D DEH104971 D DE H104971D DE H0104971 D DEH0104971 D DE H0104971D DE 465927 C DE465927 C DE 465927C
Authority
DE
Germany
Prior art keywords
phosphate
chalks
production
calcium bisulfite
lye
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
DEH104971D
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DEH104971D priority Critical patent/DE465927C/en
Application granted granted Critical
Publication of DE465927C publication Critical patent/DE465927C/en
Expired legal-status Critical Current

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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
    • C01B17/62—Methods of preparing sulfites in general

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Description

Verfahren zur Herstellung von Calciumbisulfitlauge aus phosphathaltigen Kreiden Es ist bekannt, daß in der Zellstoffindustrie große ,Mengen von Calciumbisulfitlauge verbraucht werden. Diese wird allgemein in der Weise gewonnen, daß schweflige Säure unmittelbar als gekühltes Röstgas bei Gegenwart von Wasser über Kalksteine oder Dolomit streicht. Das Gestein wird in Form großer Stücke aufgegeben. Zum Zwecke weitgehender Ausnutzung der schwefligen Säure sind große Türme erforderlich mit hohen Kosten für Anlage, Wartung und Erhaltung.Process for the production of calcium bisulfite liquor from phosphate-containing Chalks It is known that large amounts of calcium bisulfite lye are used in the pulp industry are consumed. This is generally obtained in such a way that sulphurous acid directly as a cooled roasting gas in the presence of water over limestone or Dolomite paints. The rock is abandoned in the form of large pieces. For the purpose Large towers are required with extensive utilization of the sulphurous acid high costs for installation, maintenance and upkeep.

Es ist des weiteren bekannt, durch Waschen mechanisch angereicherte phosphathaltige Kreide mit schwefliger Säure (Röstgasen) zu behandeln, wobei neben einer Calciumbisulfitlauge Phosphat erhalten wird, das dann nach Abtrennung durch weitere Einwirkung von schwefliger Säure in Dicalciumphosphat übergeführt wird. Die anfallende Calciumbisulfitlauge wird wieder in den Prozeß eingeführt.It is also known to be mechanically enriched by washing To treat phosphate-containing chalk with sulphurous acid (roasting gases), besides a calcium bisulfite phosphate is obtained, which is then separated by further exposure to sulphurous acid is converted into dicalcium phosphate. The resulting calcium bisulfite liquor is reintroduced into the process.

Die vorliegende Erfindung bezieht sich auf die gleichzeitige Gewinnung einer Calciumbisulfitlauge und von Tricalciumphosphat. Es wird phosphathaltige Kreide, ein erdiges, leicht zerreibliches Material, in Stücken oder gemahlen, roh oder geglüht, zweckdienlich in steter Bewegung, ohne vorherige mechanische Abschlämmung der Einwirkung der schwefligen Säure ausgesetzt. Dabei löst sich bei zweckentsprechender Arbeitsweise zunächst nur der kohlensaure Kalk, der in Form von Kreide vorliegt, auf, während das Phosphat und die Verunreinigungen nur unwesentlich angegriffen werden und als Rückstand verbleiben. Bevor aber die heißen Röstgase mit der phosphathaltigen Kreide zusammentreffen, werden sie - und hierin liegt das Neue der vorliegenden Erfindung - über das bei dem Verfahren übrigbleibende Phosphat nach dessen Waschung geleitet. Hierdurch wird neben einer Trocknung durch die Wärme der Gase der besondere Vorteil erreicht, daß der Restgehalt des Phosphates an kohlensaurem Kalk durch den an sich lästigen Gehalt der Röstgase an S03 noch weiter vermindert und die Phosphatmasse im wesentlichen als dreihasisch-phosphorsaurer Kalk in lockerer Beschaffenheit gewonnen wird.The present invention relates to simultaneous recovery a calcium bisulfite liquor and tricalcium phosphate. It becomes chalk containing phosphate, an earthy, easily friable material, in pieces or ground, raw or annealed, expediently in constant movement, without prior mechanical draining of the action exposed to sulphurous acid. This dissolves when working properly initially only the carbonate of lime, which is in the form of chalk, while the phosphate and the impurities are only insignificantly attacked and than Residue remain. But before the hot roasting gases with the phosphate-containing chalk come together, they will - and therein lies the novelty of the present invention - Passed over the phosphate left over from the process after it has been washed. In addition to drying through the heat of the gases, this is a particular advantage achieved that the residual content of phosphate in carbonate of lime by itself annoying SO3 content of the roasting gases is further reduced and the phosphate mass Obtained essentially as tri-phasic phosphoric acid lime in a loose consistency will.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung von Calciumbisulfitlauge aus phosphathaltigen Kreiden unter gleichzeitiger Nutzbarmachung der darin enthaltenen Phosphate, dadurch gekennzeichnet, daß man phosphathaltige Kreide ohne vorhergehende mechanische Aufbereitung zur Auflösung des kohlensauren Kalks in an sich bekannter Weise der Einwirkung von Röstgasen aussetzt, aber mit der Maßgabe, daß'die heißen Gase zuvor über den bei dem Verfahren verbleibenden Phosphatrückstand geleitet werden.PATENT CLAIM: Process for the production of calcium bisulfite lye from phosphate-containing chalks with simultaneous utilization of the contained therein Phosphates, characterized in that one phosphate-containing chalk without preceding mechanical processing to dissolve the carbonate of lime in a known per se Way exposed to the action of roasting gases, but with the proviso that'the hot Gases are previously passed over the phosphate residue remaining in the process.
DEH104971D 1926-01-13 1926-01-13 Process for the production of calcium bisulfite lye from phosphate-containing chalks Expired DE465927C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEH104971D DE465927C (en) 1926-01-13 1926-01-13 Process for the production of calcium bisulfite lye from phosphate-containing chalks

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH104971D DE465927C (en) 1926-01-13 1926-01-13 Process for the production of calcium bisulfite lye from phosphate-containing chalks

Publications (1)

Publication Number Publication Date
DE465927C true DE465927C (en) 1928-09-28

Family

ID=7169653

Family Applications (1)

Application Number Title Priority Date Filing Date
DEH104971D Expired DE465927C (en) 1926-01-13 1926-01-13 Process for the production of calcium bisulfite lye from phosphate-containing chalks

Country Status (1)

Country Link
DE (1) DE465927C (en)

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