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Neutral Leaching of Low-Grade Pyrolusite with High Silica Content
- Source :
- Journal of China University of Geosciences. 18:163-176
- Publication Year :
- 2007
- Publisher :
- Elsevier BV, 2007.
-
Abstract
- Leaching studies of low-grade pyrolusite, containing 11.84% Mn with high silicon, were carried out using sodium sulfite as a reductant in ammonium sulfate medium. Various process parameters including temperature, leaching time, solid-liquid ratio, quantity of ammonium sulfate, as well as the amount of reducing agent were studied in detail. The manganese extraction yield was the response of the process. Temperature and reagent concentration exerted the most important positive effect on the manganese extraction. The optimized conditions showed that when the amount of reducing agent was a stoichonmetric amount, over 90% manganese extraction and the lowest impurities were achieved, the amount of heavy metal impurities in the manganese leaching liquid was less than 5 mg/L, and almost no iron and aluminum were extracted in 3 mom ammonium sulfate concentration at 100 °c in 45 min.
- Subjects :
- Pyrolusite
Ammonium sulfate
Reducing agent
Inorganic chemistry
chemistry.chemical_element
Manganese
engineering.material
chemistry.chemical_compound
chemistry
Impurity
Reagent
Earth and Planetary Sciences (miscellaneous)
engineering
General Earth and Planetary Sciences
Leaching (metallurgy)
Sodium sulfite
Subjects
Details
- ISSN :
- 10020705
- Volume :
- 18
- Database :
- OpenAIRE
- Journal :
- Journal of China University of Geosciences
- Accession number :
- edsair.doi...........c504bb41f88d66152ef35f68377651ee