微量鉛及び鉄(III)の水酸化ビスマス共沈浮選

概要

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To 100 ml of water or zinc nitrate solution containing traces of lead and iron (III), was added 10mg of bismuth followed by 20 ml of 15M aqueous ammonia, to precipitate bismuth hydroxide and mask zinc against the precipitation. After the 20-min stirring, 1 ml of sodium oleate in 70% v/v ethanol (2 mg/ml) was added. The amorphous precipitate was floated with the aid of small nitrogen bubbles (diameter below 0.5mm) in a flotation cell with a sintered-glass disc (No. 4) . The mother liquor was then sucked off through the sintered-glass disc. The precipitate was washed with 5 ml of 99.5% v/v ethanol (to break the foam) followed by 10ml of water and dissolved in 4 ml of 5 M nitric acid, and the solution was diluted to 5 ml with water. Microgram quantities of lead and iron(III) were recovered in greater than 90% yields. Zinc, 3 g, remained in the mother liquor, and the separation factor for zinc was about 10^<-3>. The proposed method was applied to the atomic-absorption spectrometric determination of lead and iron in high-purity zinc metal.
1977-02-10