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Paper Information

Journal:   GEOSCIENCES   SPRING 2007 , Volume 16 , Number 63; Page(s) 72 To 77.
 
Paper: 

IRON REMOVAL STUDIES OF LOW GRADE DIASPORIC BAUXITE BY USING THERMO CHEMICAL TREATMENT

 
 
Author(s):  MOAZEMI GOUDARZI M., REZAEI BAHRAM, AMINI AHMAD
 
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Abstract: 
In this paper, iron removal studies on high iron diasporic bauxite by thermochemical treatment was investigated for the first time. For this purpose, bauxite samples were calcined in temperatures between 600 and 1100oC and then leached with hydrochloric acid. Obtained results revealed, in spite of gradual decrease in both iron and aluminum extaction with rising calcinations temperature, iron extraction to aluminum extraction is selective at calcination temperature above 900°C. Leaching studies of calcined sample at 900°C proved that leaching temperature is the most important parameter for iron dissolution in Acid and rising leaching temperatures from 20 to 95oCincreases iron extraction over 70%. The other optimum parameters are: leaching time l20 minutes, acid concentration 50% VIV, grinding size of 210 mm, pulp density of 15% solid by weight. As a Result of optimizing parameters, 96.5% of bauxite iron content removed successfully with 88.5% aluminum recovery and solid Residue iron content, i.e., the obtained concentrate, decreased from 27.02 to 1.59%.
 
Keyword(s): IRON REMOVAL, DIASPORIC BAUXITE, THERMOCHEMICAL TREATMENT, LEACHING, HYDROCHLORIC ACID, CALCINATION
 
References: 
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