Sodium cyanide is an inorganic compound, it is a white water-soluble solid. Cyanide has a high affinity for metals, so this salt is highly toxic. Easy to deliquescent, with a faint bitter almond smell. Soluble in water, ammonia, ethanol and methanol. Molecular formula NaCN. The molecular weight is 49.02. Melting point is 564 ° C. The boiling point is 1469 ° C. Vapor pressure is 1.0 mmHg (817 ℃), easily soluble in water, slightly soluble in ethanol.
Can be absorbed through the respiratory tract, digestive tract and skin. Animals inhaled sodium cyanide aerosol at 40 ~ 90 mg / m3, and experienced sticky irritation symptoms, shortness of breath, excitement, and salivation after 25 ~ 43 minutes; 150 ~ 170 mg / m3, inhalation for 62 ~ 76 minutes, or 400 ~ 500 mg / m3 10 to 20 minutes can be lethal. Human oral LD is about 1-2 mg / kg. Sodium cyanide dust is often inhaled at room temperature under production conditions, and sodium cyanide vapor can be inhaled during heat treatment. Mistake is also a common cause of poisoning. Poisoning performance and treatment are the same as hydrogen cyanide. Sodium cyanide dust scattered on the ground or tabletop can be washed with water in time to prevent hydrogen cyanide gas from polluting the air in the presence of acid. Promote cyanide-free plating to avoid health hazards of sodium cyanide.
Its main application in gold mining also takes advantage of its high activity on metals.
Sodium cyanide is an important basic chemical raw material used in basic chemical synthesis, electroplating, metallurgy and organic synthesis, medicine, pesticides and metal processing. Complexing agent, masking agent. Refining and plating of precious metals such as gold and silver.
Used as a quenching agent for various steels in the machinery industry.
In the electroplating industry, it is the main component of copper plating, silver, cadmium and zinc. In the plating solution, the anodic polarization can be reduced, the anode can be dissolved normally, the plating solution can be stabilized, and the cathodic polarization can be improved to obtain a uniform coating.
Used in the metallurgical industry to extract precious metals such as gold and silver.
In the chemical industry, it is a raw material for the production of various inorganic cyanides and hydrogen cyanide. It is also used in the manufacture of organic glass, various synthetic materials, nitrile rubber, and copolymers of synthetic fibers.
In the dye industry, it is used to make melamine chloride (reactive dye intermediate and raw material for the production of whitening agents).
Used in the pharmaceutical industry to produce methyl cyanoacetate and diethyl malonate. It is used as mordant in the textile industry and also used for liquid carburizing and nitriding of steel.
The important inorganic cyanides produced directly from sodium cyanide are yellow blood sodium, yellow blood potassium, potassium cyanide, zinc cyanide, barium cyanide, cuprous cyanide, sodium thiocyanate, and potassium thiocyanate; Organic cyanides include cyanoacetic acid, malononitrile, methionine, cyanobenzyl, melamine chloride, and the like. The main products of hydrogen cyanide reproduction using sodium cyanide are: methyl methacrylate, butyl methacrylate, methacrylic acid, azobisisobutyronitrile, nitrilotriacetic acid, hydroxyl Acetonitrile, etc.
Post time: Mar-26-2020