Dieisentrioxid Chemische Eigenschaften,Einsatz,Produktion Methoden
ERSCHEINUNGSBILD
RöTLICHBRAUNE BIS SCHWARZE KRISTALLE ODER PULVER.
CHEMISCHE GEFAHREN
Reagiert mit Kohlenmonoxidunter Explosionsgefahr.
ARBEITSPLATZGRENZWERTE
TLV: (Staub und Rauch, als Fe) 5 mg/m?(als TWA); Krebskategorie A4 (nicht klassifizierbar als krebserzeugend für den Menschen); (ACGIH 2005).
MAK: (alveolengängige Fraktion des Aerosols) 1.5 mg/m? (DFG 2005).
INHALATIONSGEFAHREN
Eine belästigende Partikelkonzentration in der Luft kann beim Dispergieren schnell erreicht werden, besonders als Pulver.
WIRKUNGEN BEI KURZZEITEXPOSITION
WIRKUNGEN BEI KURZZEITEXPOSITION: Reizt möglicherweise mechanisch.
WIRKUNGEN NACH WIEDERHOLTER ODER LANGZEITEXPOSITION
Risiko der Lungenschädigung bei wiederholter oder längerer Exposition gegenüber Staubpartikeln. Führt zu Eisenoxidstaublunge (gutartig).
LECKAGE
Persönliche Schutzausrüstung: Atemschutzgerät, P1-Filter für inerte Partikel. Verschüttetes Material in abgedeckten Behältern sammeln.
R-Sätze Betriebsanweisung:
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
Beschreibung
Iron oxides are produced synthetically and consist essentially of anhydrous and/or hydrated iron oxides. The range of hues includesyellows, reds, browns and blacks. Food quality iron oxides are primarily distinguished from technical grades by the comparatively low levels of contamination by other metals. This is achieved by the selection and control of the source of iron and/or by the extent of chemical purification during the manufacturing process. Iron oxides have been used to color confectionery, fillings and decorations for pastry products, cheese products, fish paste, pet foods, cosmetics and pharmaceutical products.
Chemische Eigenschaften
Hematite is a noncombustible, black to black red or brick-red mineral (iron ore) composed mainly of
ferric oxide, Fe2O3. Ferric oxide
Occurrence
Iron(III) oxide occurs in nature as the mineral hematite. It is the principal ore of iron from which the metal and its alloys are produced. Also, this oxide occurs in the mineral, limonite, 2Fe
2O
3?3H
2O. An important application of this compound involves producing red, orange, and yellow pigments. Other applications are in coatings for metals, steel and rubber; in ceramics; and as a catalyst for oxidation reactions.
Verwenden
Ferric Oxide is a nutrient and dietary supplement that is a source of
iron.
Definition
A high-grade red pigment used
as a polishing agent for glass, jewelry, etc. (2) A
cosmetic prepared from dried flowers of the saf-
flower.
synthetische
Iron(III) oxide is prepared as a reddish-brown hydrated precipitate by treating an aqueous solution of an iron(III) salt with caustic soda:
2FeCl
3 + 6NaOH → Fe
2O
3?3H
2O + 6NaCl
It also is obtained by thermal decomposition of iron(II) sulfate or the brown oxide hydroxide:
2FeSO
4 → Fe
2O
3 + SO
2 + SO
3 2FeO(OH) → Fe
2O
3 + H
2O
The oxide is prepared in industrial scale by first precipitating iron(II) hydroxide Fe(OH)2 by treating aqueous solutions of iron(II) sulfate and caustic soda. The Fe(OH)2 is then oxidized to iron(III) hydroxide by aeration. The latter is dehydrated by heating:
Fe
2+ (aq) + OHˉ (aq) → Fe(OH)
2(s) → 2Fe(OH)
3 → Fe
2O
3 + 3H
2O
It also is produced by ignition of iron(III) oxalate and iron carbonyls:
2Fe
2(C
2O
4)
3 +3O
2 → 2Fe
2O
3 + 12CO
.
Hazard
Pneumoconiosis. Questionable carcinogen.
mögliche Exposition
Hematite; as an iron ore composed
mainly of ferric oxide, is a major source of iron and is used
as a pigment for rubber, paints, paper, linoleum, ceramics,
dental restoratives; and as a polishing agent for glass and pre cious metals. It is also used in electrical resistors, semiconduc tors, magnets, and as a catalyst. Human exposure to hematite
from underground hematite mining is principally through
inhalation and/or ingestion of dusts. No estimates are available
concerning the number of underground miners exposed.
Carcinogenicity
Welders are typically exposed to a complex
mixture of dust and fume of metallic oxides, as
well as irritant gases, and are subject to mixeddust
pneumoconiosis with possible loss of pulmonary
function; this should not be confused
with benign pneumoconiosis caused by iron
oxide.1 Although an increased incidence of lung
cancer has been observed among hematite
miners exposed to iron oxide, presumably
owing to concomitant radon gas exposure,
there is no evidence that iron oxide alone is carcinogenic
to man or animals.6
Inkompatibilitäten
Contact with hydrogen peroxide, ethyl ene oxide, calcium hypochlorite will cause explosion.
Violent reaction with powdered aluminum; hydrazine,
hydrogen trisulfide.
Dieisentrioxid Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
