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our company is buying iron oxide/Fe2O3 ( specification is: Fe2O3≥98%; MnO≤0.5%;SiO2≤0.05%,Cl≤0.2%) and Manganese ( purity more than 71%) and Trimanganese tetraoxide/Mn3O4 ( purity more than 99%), and SrCO ( purity more than 97%).