Let’s discuss under what circumstances the smelting of acids can result in the formation of elemental sulfur
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Let’s discuss under what circumstances the production of acid through smelting can result in the formation of elemental sulfur It is common for acid production companies to observe a red-brown color in concentrated acid; could this be due to the formation of elemental sulfur? Why is the acid red-brown in color?
The formation of elemental sulfur occurs when the S-containing minerals in the melting furnace are not burned thoroughly, as there is not enough oxygen to convert all of the sulfur into SO2 or SO3. Generally, as long as the residual oxygen level in the melting furnace is above 2%, no elemental sulfur will be formed. The red color produced by concentrated sulfuric acid is due to the presence of selenium in the smoke
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When the carbon monoxide content in smelting flue gas is too high, elemental sulfur is generated in the purification unit towers and electrostatic mist eliminators. Abnormal color of sulfuric acid is mainly due to problems in the purification process. If the color is red, is it to check whether the iron level is too high through testing? Is the selenium content high? Cadmium content? Another one is nitrogen oxides; these are the most troublesome. To detect them, take a bottle of acid that is red in color and let it sit for a few days to see if any white flocculent substances appear.
If the finished acid turns red after being left for a few days, it is likely that the nitrogen oxide content in it is high.