Smelting Daily Question 12.20 (Chinese Version)
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A solution contains both antimony and bismuth; what method can be used to simply separate these two elements? Dilute with water
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Separate bismuth using a glycerol leaf of NaOH
Reply 1# yang*anghui Hydrolysis precipitation
Reply to 1# yang*anghui: The simple method is to find a reagent and add it to the solution, causing one element to precipitate, thereby achieving separation.
When an excess of sodium sulfide solution is added to the solution, bismuth sulfide does not dissolve in it, whereas antimony sulfide forms thiocompounds with sulfide ions and becomes soluble. It can be separated using filtration
An excess of sodium hydroxide is added to the solution, and bismuth hydroxide precipitate is obtained by filtration. Slightly less hydrochloric acid is then added to the solution until it becomes just clear, after which it is diluted to near-neutral pH so that the trivalent antimony ions are completely converted into bismuth hydroxide precipitate through hydrolysis; separation is achieved via filtration
Electrorefining of high-bismuth crude antimony for bismuth removal or chloride leaching-neutralization-alkaline concentration conversion for bismuth removal
Reply 1# yang*anghui Chemical method
By adding an excess of sodium sulfide to the solution, antimony can form complexes and remain in the solution, while bismuth forms sulfide precipitates, thereby allowing the two to be separated