半還元クロムペレット中の金属クロム及び金属鉄の定量法

概要

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Chemical analysis of metallic chromium and iron contained in semi-reduced pellet produced in ferrochromium factory was studied. Metallic Cr and Fe form complex carbide which is easily dissolved in concentrated H_2SO_4. However, when acid concentration was high, higher analytical values of Cr and Fe were obtained because of the dissolution of Cr and Fe from unreacted chromite ore which was contained in the semi-reduced pellet. H_2SO_4 (1+3) was most suitable to fully recover metallic Cr and Fe preventing the dissolution of chromite. Another important point was to put a condensation cooler over a beaker to maintain constant volume and concentration of acid during heating period. The boiling point of H_2SO_4 (1+3) was kept to 111℃. Under this condition being maintained for 30 minutes, the best result was obtained. The proposed method had no bias among four laboratories and precision of the method was as follows ; for metallic Cr, the standard deviation was 0.15% to mean value of 13.6%. for metallic Fe, the standard deviation was 0.20% to mean value of 11.0%.
社団法人日本鉄鋼協会の論文
1977-02-01