Fractional Determination of Quartz and Silicate in Manganese and Reduced Manganese Ores

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  • マンガン鉱石および還元マンガン鉱石中の石英と珪酸塩の分別定量法
  • マンガン コウセキ オヨビ カンゲン マンガン コウセキ チュウ ノ セキエイ ト ケイサンエン ノ フンベツ テイリョウホウ

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Abstract

The methods for the fractional determination of quartz and silicate in menganese and reduced manganese ores were examined, and after some experiments, a the following procedure is recommended for the above purpose: The silicate fraction in a 0.5 g ore sample is dissolved in a 300 mL quartz beaker on a paraffin bath of 200° for 1/2 to 1 hr with 20 mL of strong phosphoric acid (300 g of commercial orthophosphoric acid is dehydrated in a quartz flask heated at 300° on a hot plate). After dilution with 100 mL of hot water (70° to 80°), the strong phosphoric acid solution is added with 10 mL of 20% sodium fluoborate solution and a small amount of paper pulp, and allowed to stand for 30 minutes at room temperature. It is then filtered; the residue is washed thoroughly first with hot hydrochloric acid (1:9), then with water. The residue placed in a platinium crucible is ignited at about 950°, and the silica content of the ash is determined by the hydrofluoric acid method. The silicate is given by subtracting the so obtained quartz from the total silica of the sample, previously determined by means of the hydrofluoric acid method. The method is adaptable to the determination of quartz and silicate in a wide variety of samples of rocks, ores, clays and dusts.

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