Study on the Preparation of Chlorine Dioxide by Sodium Chlorate Being Reduced with Blende

The technology condition about preparation of chlorine dioxide by sodium chlorate being reduced with blende was investigated. The best reaction condition is that required amount of blende is 2%~4 % over theoretical required amount, temperature is about 60℃, concentration of sodium chlorate is 4~5 mol/L, and required amount of sulfuric acid is over 100% of theoretical required amount. This method has many virtues. For example, the reaction is easily controlled, less sulfuric acid is consumed, the cost is cheap,and purity of product is higher.