Why is most of the crystallized anhydrous copper sulfate not in the form of blue granules?
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The raw materials I use to produce anhydrous copper sulfate are copper carbonate or copper hydroxide obtained from wastewater and waste residues; through a process that involves soaking in sulfuric acid, removing iron and impurities, as well as removing contaminants, followed by concentration and cooling for crystallization, the copper sulfate produced is not mostly in the form of blue granules. Only a small portion of the crystalline surface in the middle are the crystalline blue particles, copper sulfate. During concentration, it was observed that the color of the solution tended towards green, but the reason for this was not understood. Could some teacher give me some guidance? Thank you!
Does the solution change from blue to a greenish color after concentration, before concentration, or during the concentration process? What is the proportion of the change? What is the temperature? What is the acidity level? Have any other substances been added?
It is estimated that the waste contains high levels of chlorine; copper chloride precipitates along with copper sulfate, which is what gives it a green color
-- If extraction is used, this situation should not occur. --
Analytical tests are conducted to determine whether there are any other impurity ions with high concentrations in the solution after acid dissolution; there is concern that these impurity ions will preferentially combine with copper to form compounds rather than copper sulfate during concentration
The solution already had a slightly greenish tint before concentration. Then ask your teacher to help solve the difficult problems.
If it is green even before concentration, then it is necessary to check whether it is copper chloride or copper sulfate
May I ask the teacher on the 7th floor how to detect chloride ions in a solution and remove them? Thank you!
Was the chloride content in the solution analyzed? Don’t you have a laboratory for testing and analysis?
Yes. First, isn’t it very convenient? Second, I asked two laboratory technicians and they said it’s not possible; so please teach me a simple method. I would be extremely grateful. Thank you!
Ah, it’s not possible to conduct analytical testing. No way. The accuracy of this test analysis is not a matter of convenience.