Selection of anti-extraction acids for P204 and P507
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P204 is used for extraction and impurity removal, while P507 is employed for the separation of cobalt and nickel. During the back-extraction process, most companies use hydrochloric acid; sulfuric acid is used only in rare cases. Why is that? Is it simply to obtain different types of products?
For the separation of nickel and cobalt using P507, retraction with hydrochloric acid naturally results in cobalt chloride, while retraction with sulfuric acid yields cobalt sulfate. When it comes to removing impurities using P204, 6N hydrochloric acid is generally used to remove elements such as copper and manganese from P204; it is said that sulfuric acid does not work well for this purpose.
It’s certainly not just to obtain products of different types; our company also uses hydrochloric acid for back-extraction, and then employs a set of 507 containers to convert the electrolysis system (changing from a hydrochloric acid system to a sulfuric acid system, as the working conditions in a hydrochloric acid system are unfavorable during electrolysis). I’m paying attention to this issue and hope experts can provide an answer!
Our company uses sulfuric acid for back-extraction; the extraction is very thorough, which is quite good
Reply to 3# wgfjcy: Does your company use cobalt sulfate for electrowinning?
The choice of acid for the back-extraction of P507 depends mainly on the type of product desired: if cobalt sulfate is needed, dilute sulfuric acid is used for back-extraction; if cobalt chloride is required, dilute hydrochloric acid is used. As for the person in the third floor who mentioned that cobalt chloride needs to be converted into a sulfate after back-extraction, this is likely done to thoroughly remove impurity ions from the solution. However, it seems that this approach results in high costs； For the back-extraction of P204, as long as the calcium content in the feed solution containing P204 is very low, sulfuric acid can be used for back-extraction. For the back-extraction of iron, high-concentration hydrochloric acid is generally used, and this is not solely due to considerations related to acidity.
I feel that one should use the acid that is suitable for the type of product needed. :handshake
And then there are the prices of sulfuric acid and hydrochloric acid
Reply to 7# bashq: May I ask why hydrochloric acid is used to remove iron from P204?
Reply to 10# huazhimaomao: So, compared with sulfuric acid at the same equivalent weight, apart from having the same acidity, what other properties do chloride ions possess?
Reply 11# bashq: What is the networking effect?