What is this yellow substance most likely to be?
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A certain non-metallic ore was leached with sulfuric acid (30%), and the leachate turned green. After oxidation with hydrogen peroxide, it remained green (Fe2+ was ruled out). By adjusting the pH to around 4.8 using sodium carbonate, iron was separated, and the green color of the solution disappeared; it turned yellow. When the pH was adjusted to 6, a yellow precipitate began to form. After filtering out this yellow precipitate, the solution became colorless. Please help analyze the following: Which substance is most likely to be responsible for the color of the green solution? What is the yellow precipitate most likely to be? Is it a color development caused by a substance? I would appreciate it if friends could help analyze this so that I can proceed with the tests in a targeted manner. Thank you! ! !
Non-metallic minerals? I don’t understand; I really don’t get it. I’ll wait for someone more knowledgeable to teach me how to do it*.
Yes, it is a non-metallic ore, but it contains small amounts of rare metals, and efforts are also made to recover these metals.
I’m sitting in sludge, and encountering this phenomenon – it might be related to chromium? I’m not entirely sure either
Thank you! At first, I also thought it was chromium; in previous cases with chromium, adding sodium sulfide resulted in a green precipitate, but this time there was a black precipitate. After testing, it turned out to not be chromium.
It would be best for the poster to conduct an elemental analysis of the leachate, classify the major elements, and then make judgments based on their relevant chemical and physical properties. Without a full understanding of your specific situation, it’s impossible to make an accurate judgment based solely on such simple observations; it’s just speculation.
I personally think it might be sulfur, right?
Fluorescence semi-quantification can be performed on the ore, or it can also be done on the yellow precipitate
Thank you! There are actually many testing methods available, but since we are in a remote area, spectroscopy cannot be performed. I plan to do the analysis after returning to Beijing.
Sulfuric acid solutions are green; I only know about nickel sulfate and copper sulfate.
I also know CoSO4, Cr2(SO4)3, and VOSO4; I’m not too familiar with the others.