Thermogravimetry and differential thermal analysis have shown that, when nickel(II) sulphide and manganese or iron oxides are heated together, several reactions occur depending on the molar ratio of the reactants. Detailed examinations of these reactions have shown that there are a number of intermediate stages, including the formation of sulphates.Previous workers [1] have shown that, on heating, manganese(II) sulphide reacts with oxides of manganese to give overall reactions of the type SOLID + SOLID ~ SOLID + GAS Using the basic techniques of thermogravimetry, differential thermal analysis, X-ray powder diffraction and chemical analysis, it has been possible to elucidate the reactions occurring when nickel(II) sulphide and oxides of manganese or iron are heated together, and by taking samples from the mixtures during the reactions, to study the reaction mechanisms involved. This was prepared by heating MnSO4 9 4H20 in air at 800 ~ for 12 hours, washing the residue with water until free from sulphate and then drying. The sample contained 99.5 % Mn20 a and had the partrigetite structure. Experimental Reactants
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