Direct Electrochemical Reduction of Hematite Pellets in Alkaline Solutions

Electrochemical Reduction of Selenium ( + 4 ) in Acidie Perchlorate Solutions

The mechanism of selenium(+4) electrocbemical reduction in acidic perchlorate solutions was studied. Dropping mercury and hanging mercury drop electrodes were used in direct current, alternating current, pulse and differential pulse polarographic and voltammetric measurements. Potentiostatic electrolysis experiments on mercury electrode were also performed. Precipitates formed on the electrode ...

Direct electrochemical reduction of hemin in imidazolium-based ionic liquids

The direct electrochemical reduction of hemin, protoporphyrin(IX) iron(III) chloride, ligated with strong or weak heterocyclic bases, was investigated in the ionic liquids (IL), 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) and 1-octyl-3methylimidazolium hexafluorophosphate ([omim][PF6]), using cyclic voltammetry and chronocoulometry. Hemin complexed with N-methylimidazole (NMI)...

Magnetic clusters in ilmenite-hematite solid solutions

RECOVERY OF IRON FROM LOW-GRADE HEMATITE ORE USING COAL-BASED DIRECT REDUCTION FOLLOWED BY MAGNETIC SEPARATION

In the present work, iron recovery from a low-grade hematite ore (containing less than 40% iron), which is not applicable in common methods of ironmaking, was studied. Non-coking coal was used as reducing agent. Reduction experiments were performed under various coal to hematite ratios and temperatures. Reduction degree was calculated using the gravimetric method. Reduced samples were subjected...

Electrochemical reduction of nitrates and nitrites in alkaline media in the presence of hexavalent chromium

Electrochemical reduction of nitrates and nitrites in alkaline media at constant current is rendered inoperable in the presence of hexavalent chromate. Even at chromate concentrations as low as 9mgdm, the chromium hydroxide ®lm, formed by the reduction of chromate, interferes with the reduction of nitrate and nitrite. We show that reversing the polarity of the electrodes at constant time interv...