1. Shandong Institute of Geological Sciences, Jinan 250013, China; 2. Shandong Provincial Key Laboratory of Metallogenic Geological Process and Resource Utilization, Jinan 250013, China
Abstract：There are few studies about the chemical phase analysis of iron in ilmenite ores. The chemical phase division of iron in different literatures is inconsistent, and the extraction methods are also different. The detailed results of single mineral leaching test are not reported in most literatures.Test samples were collected from one typical ilmenite mining area,and the required single mineral was selected.Through leaching tests of single mineral and actual sample,the optimal leaching and separation processes for each phase were obtained:the sample was leached with the mixed solution of acetic acid, hydrogen peroxide and boric acid,and the filtrate was used for the determination of iron in sulfide and iron carbonate;the residue was leached with the mixed solution of hydrobromic acid and tin dichloride,and the filtrate was used for the determination of iron in oxides such as magnetite,hematite and limonite;the residue was ashed and burned at 800 ℃ followed by leaching with nitric acid and ammonium fluoride solution,and the filtrate was used for the determination of iron in silicate;the remaining residue was used for the determination of iron in ilmenite.According to the iron content in the leaching solution of each phase,the content of iron was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES) or potassium dichromate titrimetric method.Consequently, the analysis method for chemical phases of iron in iron ores was established. The limit of detection was 0.002%-0.045%.The proposed method was applied to the determination of reference materials for phase analysis of iron ores,and the results were basically consistent with the certified values.The method was also used for the determination of samples of ilmenite ores,and the relative standard deviations (RSD, n=12) of determination results for phases were all below 4%.The relative deviation between the sum of each phase iron content and the total iron content was less than 2%,which could meet the requirements in DZ/T 0130-2006 The Specification of Testing Quality Management for Geological Laboratories. The analysis results of main phases by proposed method were basically consistent with those obtained by Mineral Liberation Analyzer(MLA).Experimental methods can provide reference for the formulation of relevant standards.
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