還元マンガン鉱石中の金属鉄の分別定量法

抄録

Investigations has been carried out on the suitability of methanolic cupric chloride solution for solution of only the metallic iron fractions in a reduced manganese ore which contains ferro manganese fractions other than oxides of various grades of iron and manganese, and the possible interference of the cupric ions present in the resultant iron solution in the permanganate titration. A sample of to 0.20 g was treated with 50 mL of methanol containing 5 g of cupric chloride and 0.4 g of sodium carbonate at 40°C for an hour, cooled and filtered, then the mixture of the filtrate and the washings is made up to 0.1 N sulfuric acid solution and heated till colorless after addition of 0.3 g of metallic aluminum, and again filtered. The iron determined by means of permanganate titration in the filtrate represents the metallic fraction of the reduced manganese ore and ferro-manganese.