Calciumcyanid

Bezeichnung:Calciumcyanid

CAS-Nr592-01-8

Englisch Name:CALCIUM CYANIDE

CBNumberCB8105338

SummenformelC2CaN2

Molgewicht92.11

MOL-Datei592-01-8.mol

Synonyma

Calciumcyanid

Cyancalcium

Calcyan

Calciumcyanid physikalisch-chemischer Eigenschaften

Schmelzpunkt	640 estimated [KIR78]
Dichte	1.8 g/cm3
Löslichkeit	soluble in H2O, ethanol
Aggregatzustand	white rhombohedral crystals
Farbe	white rhomb crystals, crystalline; hygroscopic
Wasserlöslichkeit	soluble H2O, gradually releasing HCN [MER06]
Expositionsgrenzwerte	TLV-TWA (measured as CN) skin 5 mg(CN)/ m3 (ACGIH); 5 mg(CN)/m³/10-min ceiling (NIOSH).
EPA chemische Informationen	Calcium cyanide (592-01-8)

Sicherheit

Kennzeichnung gefährlicher	T+,N
R-Sätze:	28-32-50/53
S-Sätze:	7/8-23-36/37-45-60-61
RIDADR	1575
HazardClass	6.1(a)
PackingGroup	I
HS Code	28371990
Giftige Stoffe Daten	592-01-8(Hazardous Substances Data)
Toxizität	LD50 orally in rats: 39 mg/kg (Smyth)

Gefahreninformationscode (GHS)

CALCIUM CYANIDE Chemische Eigenschaften,Einsatz,Produktion Methoden

ERSCHEINUNGSBILD
FARBLOSE KRISTALLE ODER WEISSES PULVER MIT CHARAKTERISTISCHEM GERUCH.
CHEMISCHE GEFAHREN
Zersetzung beim Erhitzen über 350°C unter Bildung giftiger Rauche mit Stickstoffoxiden und Cyanwasserstoff. Reagiert sehr heftig mit Wasser, feuchter Luft, Kohlendioxid, Säuren und sauren Salzen unter Bildung hochgiftigen und entzündlichen Cyanwasserstoffs. Sehr heftige Reaktion beim Erhitzen mit oxidierenden Substanzen. Feuer- und Explosionsgefahr.
ARBEITSPLATZGRENZWERTE
TLV: (als CN) 5 mg/m?(als STEL, ceiling); Hautresorption; (ACGIH 2005).
MAK: (als CN) 2 mg/m? Spitzenbegrenzung: überschreitungsfaktor II(1); (Einatembare Fraktion); Hautresorption; Schwangerschaft: Gruppe C; (DFG 2006).
AUFNAHMEWEGE
Aufnahme in den Körper durch Inhalation, über die Haut und durch Verschlucken.
INHALATIONSGEFAHREN
Verdampfung bei 20°C vernachlässigbar; eine gesundheitsschädliche Partikelkonzentration in der Luft kann jedoch beim Dispergieren schnell erreicht werden.
WIRKUNGEN BEI KURZZEITEXPOSITION
WIRKUNGEN BEI KURZZEITEXPOSITION:
Die Substanz reizt die Augen, die Haut und die Atemwege. Möglich sind Auswirkungen auf den intrazellulären Sauerstoff-Stoffwechsel mit nachfolgenden Krämpfen und Bewusstlosigkeit. Exposition kann zum Tod führen.
WIRKUNGEN NACH WIEDERHOLTER ODER LANGZEITEXPOSITION
Wiederholter oder andauernder Hautkontakt kann Dermatitis hervorrufen.
LECKAGE
Gefahrenbereich verlassen! Fachmann zu Rate ziehen! NICHT in die Kanalisation spülen. Verschüttetes Material in Behältern sammeln. Reste sorgfältig sammeln. An sicheren Ort bringen. Kontakt mit Wasser oder Feuchtigkeit verhindern. NICHT in die Umwelt gelangen lassen. Chemikalienschutzanzug mit umgebungsluftunabhängigem Atemschutzgerät.
R-Sätze Betriebsanweisung:
R28:Sehr giftig beim Verschlucken.
R32:Entwickelt bei Berührung mit Säure sehr giftige Gase.
R50/53:Sehr giftig für Wasserorganismen, kann in Gewässern längerfristig schädliche Wirkungen haben.
S-Sätze Betriebsanweisung:
S7/8:Behälter trocken und dicht geschlossen halten.
S23:Gas/Rauch/Dampf/Aerosol nicht einatmen(geeignete Bezeichnung(en) vom Hersteller anzugeben).
S36/37:Bei der Arbeit geeignete Schutzhandschuhe und Schutzkleidung tragen.
S45:Bei Unfall oder Unwohlsein sofort Arzt zuziehen (wenn möglich, dieses Etikett vorzeigen).
S60:Dieses Produkt und sein Behälter sind als gefährlicher Abfall zu entsorgen.
S61:Freisetzung in die Umwelt vermeiden. Besondere Anweisungen einholen/Sicherheitsdatenblatt zu Rate ziehen.
Beschreibung
Calcium cyanide is used mainly for the extraction or cyanidation of gold and silver ores. It is also used in the production of prussiates or ferrocyanides, in the froth flotation of minerals, in processes where gold complexes are adsorbed on carbon, in the manufacture of stainless steel, as a fumigant and rodenticide, and as a cement stabiliser. The main users of cyanides are the steel, electroplating, mining, and chemical industries. The principal cyanide compounds used in industrial operations are potassium and sodium cyanide and calcium cyanide, particularly in metal leaching operations. Cyanides have been well established in uses as insecticides and fumigants; in the extraction of gold and silver ores; in metal cleaning; in the manufacture of synthetic fibres, various plastics, dyes, pigments, and nylon; and as reagents in analytical chemistry. Calcium cyanide decomposes on heating above 350°C, producing toxic fumes including nitrogen oxides and HCN. It reacts violently with water, moist air, carbon dioxide, acids, and acid salts producing highly toxic and flammable HCN. It reacts violently when heated with oxidising substances causing fire and explosion hazard.
Chemische Eigenschaften
Calcium cyanide is a white crystalline solid or powder. Odor of hydrogen cyanide.
Verwenden
Fumigant; rodenticide; in stainless-steel manufacture; in leaching ores of precious metals; stabilizer for cement.
Verwenden
Calcium cyanide is used for the extraction of gold and silver from their ores, in the froth flotation of minerals, as a fumigant, and as a rodenticide.
Vorbereitung Methode
Calcium cyanide is made commercially from lime, calcium oxide, coke, and nitrogen. The reactions are carried out in an electric furnace. The resulting melt is cooled rapidly to prevent reversion to calcium cyanamide. The product is marketed in the form of flakes, which are dark gray because of the presence of carbon. The extraction or cyanidation of precious-metal ores was the first and is still the largest use for calcium cyanide.
Allgemeine Beschreibung
White crystals or powder or gray-black powder (technical grade). Toxic by skin absorption through open wounds, by ingestion, and by inhalation.
Air & Water Reaktionen
Water soluble with evolution of some hydrogen cyanide, a flammable poison gas. Release of gas is much more rapid if acid is present.
Reaktivität anzeigen
CALCIUM CYANIDE gives weakly acidic solutions. Contact with acids causes rapid evolution of hydrogen cyanide. Incompatible with isocyanates, nitrides, and peroxides. May react rapidly with oxidizing agents.
Hazard
Toxic by ingestion and skin absorption.
Health Hazard
Inhalation or ingestion causes headache, nausea, vomiting and weakness; high concentrations are rapidly fatal.
Health Hazard
Calcium cyanide is a highly poisonous compound to humans, animals, and fish. The toxic routes are ingestion, skin contact, and inhalation of the dust. It forms HCN readily when it reacts with CO2 or water. This makes it highly hazardous, more so than the alkalimetal cyanides, although the LD50 value of Ca(CN)2 is greater than the sodium or potassium cyanides.
LD50 value, oral (rats): 39 mg/kg.
Brandgefahr
Special Hazards of Combustion Products: Decomposes in fire to give very toxic gases, including hydrogen cyanide.
Sicherheitsprofil
A deadly poison by ingestion and probably other routes. When heated to decomposition it emits toxic fumes of NO, and CN-. See also CALCIUM COMPOUNDS and CYANIDE
mögliche Exposition
Calcium cyanide is used as a fumigant; as a rodenticide; in leaching precious metal ores; in the manufacture of stainless steel; and as a stabilizer forcement. Used as raw material for production of nitrogenous compounds and in treatment of alcoholism
Erste Hilfe
If this chemical gets into the eyes, remove anycontact lenses at once and irrigate immediately for at least15 min, occasionally lifting upper and lower lids. Do notallow water to enter nose or mouth. Seek medical attentionimmediately. If this chemical contacts the skin, removecontaminated clothing and wash immediately with soap andwater. If this chemical has been inhaled, remove from expo?sure, begin rescue breathing (using universal precautions,including resuscitation mask) if breathing has stopped andCPR if heart action has stopped. Transfer promptly to a532 Calcium cyanidemedical facility. When this chemical has been swallowed,get medical attention. Give large quantities of water andinduce vomiting. Do not make an unconscious personvomit. Medical observation is recommended for 24-48 hafter breathing overexposure, as pulmonary edema may bedelayed. As first aid for pulmonary edema, a doctor orauthorized paramedic may consider administering a corticosteroid spray. Use amyl nitrate capsules if symptoms of cyanide poisoning develop. All area employees should betrained regularly in emergency measures for cyanidepoisoning and in CPR. A cyanide antidote kit should bekept in the immediate work area and must be rapidly available. Kit ingredients should be replaced every 1-2 years toensure freshness. Persons trained in the use of this kit,oxygen use, and CPR must be quickly available.
Lager
Calcium cyanide is stored in tight containers free from moisture. Proper ventilation and protective equipment should be used while handling the solid or while preparing an aqueous solution. It is shipped in mild-steel or fiber drums.
Versand/Shipping
UN1575 Calcium cyanide, Hazard Class: 6.1; Labels: 6.1-Poisonous materials
Inkompatibilitäten
Contact with water, acids, acidic salts; moist air, or carbon dioxide, forms highly toxic and flammable hydrogen cyanide. Incompatible with fluorine, magnesium. Reacts violently when heated with nitrites, nitrates, chlorates, and perchlorates. Calcium cyanide decomposes in high heat forming hydrogen cyanide and nitrous oxides fumes
Waste disposal
Add cyanide waste to strong alkaline sodium hypochlorite. Let stand 24 hours then flush to sewage plant.

CALCIUM CYANIDE Upstream-Materialien And Downstream Produkte

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