Treatment of cyanide-containing wastewater by the sulfur dioxide air method
Thread Content
Recently, the factory has been testing the use of sulfur dioxide to treat cyanide-containing lean solutions, but the results have not been satisfactory. I would like to ask about the specific procedures and key points of this process? Such as the specific control of pH, the amount of sulfur dioxide added, and the oxidation time, etc. Urgent! ! ! !
Within my knowledge, sulfur dioxide has not been used yet, but I have come across chlorine dioxide. For chlorine dioxide, please refer to the basic chlorination-cyanide destruction method...
Your understanding is a bit outdated; these days, many smelters use the sulfur dioxide air method for decyanidation.
Could you please share the detailed process for producing lean liquid so that we can exchange information?
Acidified copper precipitation～Vacuum liquid alkali absorption～Oxidation
Within a certain pH range, under the catalysis of copper and through the combined action of SO2 and air to oxidize ** in wastewater, this process is known as the sulfur dioxide-air oxidation method, often abbreviated as the SO2/Air method. This method was invented by Canadian International Nickel in 1982. The company’s English abbreviation is INCO; therefore, the sulfur dioxide-air oxidation method is also called the INCO process. The sulfur dioxide-air oxidation method is simple in process, has uncomplicated equipment; its treatment efficiency is generally better than that of the chlorine oxidation method (ignoring the toxicity of sulfur **); the reagents required are readily available, the treatment costs are not high, and the investment required is low. Therefore, in recent years, more than thirty mines have adopted this method. China began researching the sulfur dioxide-air oxidation method in 1984, and industrial trials were completed in 1988. Several cyanide plants have used this method to treat cyanide-containing wastewater, achieving certain results.