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Chemical Name:
calcid;ca(cn)2;calcyan;cyanogas;calcyanide;Ca(CN)2.NaCl;caswellno142;Calciumcyanid;CALCIUM CYANIDE;cyanuredecalcium
Molecular Formula:
Formula Weight:
MOL File:


Melting point:
640 estimated [KIR78]
white rhombohedral crystals
Water Solubility 
soluble H2O, gradually releasing HCN [MER06]


Hazard Codes  T+,N
Risk Statements  28-32-50/53
Safety Statements  7/8-23-36/37-45-60-61
RIDADR  1575
HazardClass  6.1(a)
PackingGroup  I
Toxicity LD50 orally in rats: 39 mg/kg (Smyth)


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CALCIUM CYANIDE Chemical Properties,Uses,Production


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.

Chemical Properties

Calcium cyanide is a white crystalline solid or powder. Odor of hydrogen cyanide.


Fumigant; rodenticide; in stainless-steel manufacture; in leaching ores of precious metals; stabilizer for cement.

General Description

White crystals or powder or gray-black powder (technical grade). Toxic by skin absorption through open wounds, by ingestion, and by inhalation.

Air & Water Reactions

Water soluble with evolution of some hydrogen cyanide, a flammable poison gas. Release of gas is much more rapid if acid is present.

Reactivity Profile

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.


Toxic by ingestion and skin absorption.

Health Hazard

Inhalation or ingestion causes headache, nausea, vomiting and weakness; high concentrations are rapidly fatal.

Fire Hazard

Special Hazards of Combustion Products: Decomposes in fire to give very toxic gases, including hydrogen cyanide.

Safety Profile

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

Potential Exposure

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

First aid

If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 minutes, occasionally lifting upper and lower lids. Do not allow water to enter nose or mouth. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medical attention. Give large quantities of water and induce vomiting. Do not make an unconscious person vomit. Medical observation is recommended for 24 to 48 hours after breathing overexposure, as pulmonary edema may be delayed. As first aid for pulmonary edema, a doctor or authorized paramedic may consider administering a drug or other inhalation therapy. Use amyl nitrate capsules if symptoms of cyanide poisoning develop. All area employees should be trained regularly in emergency measures for cyanide poisoning and in CPR. A cyanide antidote kit should be kept in the immediate work area and must be rapidly available. Kit ingredients should be replaced every 12 years to ensure freshness. Persons trained in the use of this kit; oxygen use, and CPR, must be quickly available


UN1575 Calcium cyanide, Hazard Class: 6.1; Labels: 6.1-Poisonous materials


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 Preparation Products And Raw materials

Raw materials

Preparation Products


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