Zinc extraction from iron-zinc-containing waste acid
Thread Content
Experts, has anyone ever developed a process for extracting zinc from iron-containing waste acid (8-10% iron, 3-6% zinc, 1-5% HCl)? It is best to use the solvent extraction process; is there anyone I can consult?
It doesn’t seem so. This has been a problem plaguing the hot-dip galvanizing industry for over a decade.
Add some lime, precipitate and filter it, then sell it to Harbin Pharmaceutical Factory No. 6 for use in calcium-iron-zinc oral liquid
The cost of extracting zinc separately may be high. Ammonia is used for neutralization to separate the iron oxide precipitate from zinc, after which the zinc-containing solution is appropriately treated. This is itself a hydrometallurgical process; the original poster must be an expert in this field.
I use the extraction method; the separation of iron and zinc is thorough, but there is one issue: the original solution contains a large amount of organic additives (emulsifiers, surfactants, acid mist inhibitors, etc.), which affects the reuse of the extractant.