Ten Questions and Answers on Sodium Cyanide and Its Disposal

　　 Regarding the sodium cyanide and its related disposal in the Tianjin Port explosion, Xinhua News Agency reporters talked about the chemical industry senior researcher Qu Ruijing.

One question: What is the form of sodium cyanide?

Qu Ruijing: Sodium cyanide has two forms, liquid and solid. Due to economic and packaging reasons, it is basically solid sodium cyanide.

Question 2: Does the explosion change the shape of sodium cyanide?

Qu Ruijing: No, the explosion shock wave will only split the sodium cyanide packaging part, and a small part will be scattered within the range that the shock wave can reach. The shape is still solid and part of the volume will shrink.

Three questions: Under what circumstances is sodium cyanide dangerous?

Qu Ruijing: Sodium cyanide is only dangerous if it encounters enough water. Sodium cyanide may produce highly toxic gases such as hydrogen cyanide when exposed to water. At a temperature of 30 degrees Celsius, 1 kilogram of water can dissolve about 0.4 kilograms of solid sodium cyanide.

Four questions: What kind of feeling does the human body feel when hydrogen cyanide enters the atmosphere?

Qu Ruijing: There is no feeling when the human body does not touch. At present, this amount is slightly exceeded, and only a few people are felt.

Five questions: Will sodium cyanide be directly volatilized into the air?

Qu Ruijing: No, unless the package is damaged and encounters enough water.

Six questions: Why did the site have detected a slight excess of cyanide? How to deal with it?

Qu Ruijing: At present, sodium cyanide may flow into the sewage treatment tank with a small amount of fire water, so it is found that cyanide slightly exceeds the standard. Now the professionals are ready to dig up the soil that may contain sodium cyanide and recycle it thoroughly to ensure that there are no omissions. The next step is to spray hydrogen peroxide in the scattered areas of sodium cyanide to eliminate missing sources of pollution. The elimination of sodium cyanide requires the use of hydrogen peroxide which is highly oxidizing.

Question 7: If sodium cyanide does meet water, how to treat its pollutants harmlessly? How to digest hydrogen cyanide into the air?

Qu Ruijing: Liquid hydrocyanic acid should also be neutralized with hydrogen peroxide or sodium thiosulfate. The gas is adsorbed by the water in the air and settled with the hydrocyanic acid treatment method.

Eight questions: Where is the 700 tons of sodium cyanide generally used?

Qu Ruijing: Now sodium cyanide is mainly used in mineral processing.

Nine Questions: What are the conditions for the transportation and storage of sodium cyanide?

Qu Ruijing: Sodium cyanide should be transported and stored under strict closed conditions to avoid high temperature and pressure and avoid contact with liquid.

Question 10: If the human body has to be exposed to the air with excessive cyanide, how should it be protected?

Qu Ruijing: When the cyanide in the air exceeds the standard, people should avoid direct contact with bare skin. When there is no protective clothing and gas mask, use a wet towel to tighten the facial organs and avoid the fresh air circulation.

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