Separation of arsenium-manganese-calcium slag
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The existing arsenic-manganese-calcium slag has an approximate composition of As: 20~30%； Mn: 15~20% ； Ca: 20~25%. It is now desired to separate this mixture in order to recover As2O3, MnSO4, and gypsum; experts are requested to provide guidance.
You need to explain the phase composition of each component. Otherwise, it’s really hard to give advice. In the case of metallurgical slag, its various components usually already exist as stable complex compounds; generally, only pyroprocessing can be used, although water-based separation is also a possibility. But it is highly unlikely that any of these three principal components can be separated by water dissolution. Therefore, I’m afraid the most feasible way to obtain this residue is through reduction in an electric furnace, resulting in metallic arsenic and manganese; (but can these two form an alloy?) Is there a precedent? Dust pollution problem? To be discussed. ) Calcium as a slag-forming component.
It is now intended to separate it by wet methods, with manganese present in the form of water and manganese dioxide. Calcium exists in the form of calcium sulfate, with 60% water content; it is the waste residue after arsenic removal. I was wondering if anyone has any good suggestions.
1. Sulfuric acid leaching and filtration. 2. The filtrate is reduced with a reducing agent to obtain As2O3 crystals, after which filtration under pressure is carried out. 3. Evaporate the filtrated solution to obtain manganese sulfate.
Reply to 2# Lao He: The calcium slag in our company consists mainly of calcium hydroxide particles, small-molecule organic substances, and calcium chloride solution. Do you have any good suggestions for dealing with it? Thank you for your guidance.
Arsenic is recovered through sulfation roasting at around 500°C; the solution resulting from washing the slag contains manganese sulfate along with a small amount of calcium sulfate, while the slag itself is calcium sulfate...