Test Research of Leaching Aid Leaching and Salt Removal from Iron Dust
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Abstract:
Adding aid leaching agent leached the soluble salts in iron dust. The K+ and Na+ leaching rates reached 81.95% and 72.45% separately and the content of Cl- in the slurry decreased to 0.4 g/L. In the reclamation of the slurry remade by the filter cake, the separation indexes recovering iron and carbon were improved, resolving the problems of equipment corrosion and interference separation caused by soluble salts and improving the utilization rate of secondary resource.Cite
Taking sulfide as a leaching agent,tests were conducted on the intensified-leaching of iron oxide from acid-leach residue.Influence of different factors,such as consumption of leaching agent,dosage of sulfuric acid,leaching time and temperature,as well as liquid-solid ratio,on the leaching effect was investigated.Results show that iron leaching rate reaches 89.2% and the leach rate of zinc from leaching agent is 90.2% under the following conditions of the initial liquid/solid ratio being 2∶1,the mass ratio of leaching agent to residue being 0.69∶1,excess coefficient of sulfuric acid being 1.4,with a stirring rate at 1 300 r/min and reaction at the temperature of 95 ℃ for 2 h.The tailings obtained can also be used for further gold-extraction.This process is simple with low energy consumption compared with the existing technology,and sulfuric acid consumption is greatly reduced.
Lixiviant
FERRIC IRON
Residue (chemistry)
Selective leaching
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