The hue of the by-products obtained from flue gas desulfurization in metallurgy is yellowish
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Our company uses soda ash to remove sulfur-containing flue gases from smelting processes, producing sodium sulfite as a by-product; however, the color of the final product is yellowish, and its composition has not yet been determined. Is there anyone **with experience who can help judge this? My personal guess is iron compounds, or elemental sulfur, or sodium metabisulfite?
Let’s take a look and wait for an expert to provide an answer. I don’t understand the alkaline desulfurization process.
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This post was last edited by zjing80 on 2016-11-8 at 15:58. It can be ruled out using analytical methods; it’s not possible to determine what it is at the moment. One can first use a sulfur analyzer to measure the sulfur content in this solid. If sulfur is present, it should be elemental sulfur, but the likelihood of that being the case is low. Other components can be analyzed using a elemental analyzer to determine the levels of iron and sodium (calcium, magnesium, potassium, etc., can also be measured), and then a comprehensive analysis is conducted to identify which substances they are. Based on the high likelihood that it is a salt composed of sulfur, oxygen, and sodium, including sodium metabisulfite, it was ultimately determined that laboratory analysis was required.
Can sodium metabisulfite be used in food factories?
1. The iron ion content exceeds 10 PPm; 2. Excessive sulfur dioxide is absorbed, with part of it converting to sodium bisulfite, resulting in a pH level likely ranging from 9.8 to 6. 3. The sodium sulfite absorption solution is filtered without being prepared with liquid alkali.
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I have a rubber factory that uses wastewater from desulfurization processes containing sodium carbonate; the water is dark red in color. After using our chemicals, the water becomes colorless and transparent. The dark red color of the desulfurization wastewater is likely caused by organic substances. If you’re interested, you can add me on WeChat at 13403789439; I can send you photos or samples.