The reactions of some compounds of manganese with molten lithium carbonate-sodium carbonate-potassium carbonate eutectic

1983 ◽  
Vol 36 (1) ◽  
pp. 25 ◽  
Author(s):  
I Salarzadeh ◽  
SA Tariq
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Sodium Carbonate ◽  
Potassium Carbonate ◽  
Alkali Metals ◽  
Reaction Medium ◽  
Lithium Carbonate ◽  
Molten Lithium ◽  
Oxide Ions ◽  
Carbonate Melt

The reactions of MnO, MnCl2, MnCO3, MnSO4, Mn2O3, Mn3O4, MnO2 and KMnO4 with molten lithium carbonate-sodium carbonate-potassium carbonate eutectic were studied under argon as well as carbon dioxide atmospheres. Final products for MnCl2 reaction consisted of a mixture of oxy anions, MnO2- and MnO32-, and those for MnCO3 were MnO32- and Mn2O52- as were for the reactions of MnSO4 and MnO2. Mn2O3 and Mn3O4 reacted to form the oxy anion, MnO2-. KMnO4 decomposed to form initially a mixture of Mn7O164- and MnO42-. These oxy anions reacted further with the eutectic to produce the oxy anion, MnOS32-. Three alkali metals were present as cationic species with the above manganese oxy anions in different ratios. The carbonate melt acted both as a reaction medium and as a Lux-Flood base, that is a donor of oxide ions evolving carbon dioxide which was partly reduced to carbon monoxide in the reactions involving manganese(II) compounds. The stoichiometries of these reactions have been suggested. Manganese(II) oxide was found to be unreactive with the carbonate eutectic.

The Reactions of 11 Compounds of Copper, Silver and Chromium With the Molten Lithium-Sodium-Potassium Carbonate Eutectic

1986 ◽  
Vol 39 (7) ◽  
pp. 1119 ◽  
Author(s):  
I Salarzadeh ◽  
SA Tariq
Keyword(s):  
Carbon Dioxide ◽  
Potassium Carbonate ◽  
Potassium Chromate ◽  
Sodium Potassium ◽  
Chromium Vi ◽  
Temperature Ranges ◽  
Molten Lithium ◽  
Chromium Compounds ◽  
Oxide Ions ◽  
Silver Compounds

The reactions of Cu2Cl2, CuCl2, AgCl , AgNO3, CrCl2, CrCl3, Cr2O3, K2CrO4, K2Cr2O7, K2Cr3O10 and CrO3 with the molten lithium-sodium-potassium carbonate eutectic were investigated under argon as well as carbon dioxide atmospheres. Copper(I) and copper(II) chlorides reacted to produce CuO with the evolution of CO and CO2 respectively. The silver compounds reacted to produce silver metal and a mixture of O2 and CO2. Chromium(II) and chromium(III) chlorides and Cr2O3 were converted into alkali-metal chromate(III) species. Potassium chromate(VI) was found to be stable in the eutectic. Chromium(VI) oxide, dichromate(VI) and trichromate (VI) accepted oxide ions from the carbonate eutectic, and were ultimately converted into chromate(VI). Carbon dioxide was evolved in all the reactions of the chromium compounds; however, the CrCl2 reaction produced a mixture of CO and CO2. The temperature ranges of the reactions and their stoichiometries were established.

Sign in / Sign up

Export Citation Format

Share Document