Sodium cyanide is an inorganic compound with a cubic crystal system and a chemical formula of NaCN. It is a white crystalline powder that is easily deliquescent and has a faint smell of bitter almonds. It is highly toxic and can cause death by poisoning if exposed to skin wounds, inhaled, or swallowed in trace amounts. Easily soluble in water and easily hydrolyzed to generate hydrogen cyanide. The aqueous solution is strongly alkaline. Sodium cyanide is an important basic chemical raw material and is used in basic chemical synthesis, electroplating, metallurgy and organic synthesis medicine, pesticides and metal processing. Complexing agent, masking agent. . In the metallurgical industry, it is used to extract precious metals such as gold and silver.