Tin smelting slag typically containing scandium of from 0.05 to 0.6%, scandium-containing material of higher, having recovery value. The slag is leached with hydrochloric acid to obtain a solution containing 150 to 300 ml of hydrazine and a hydrochloric acid concentration of 1 to 2 M. 0.3 ~ 1.0M extracted kerosene solution of P204, stripping the hydrogen fluoride, containing the sulfuric acid to obtain crude 2 O 3 72% scandium oxide Sc, recoveries of 80% to 82%. Since the mother liquid contains impurities such as zirconium , titanium and tin, it forms a third phase with P 2 O 4 and affects the extraction separation. In order to eliminate the interference of zirconium, H 3 PO 4 can be added to remove the zirconium to form Zr(HPO 4 ) 2 precipitate, Zr(HPO 4 ) 2 will adsorb ruthenium, but increasing the acidity can reduce the adsorption of ruthenium, and the mother liquor after zirconium removal, Extraction with P 2 O 4 did not form a third phase. The crude cerium oxide is dissolved in hydrochloric acid, and the oxalic acid precipitate is burned to form cerium oxide. Then, the cerium oxide is dissolved by hydrochloric acid, precipitated by sodium thiosulfate, acid-soluble, and the iodate of titanium, zirconium and strontium is removed by precipitation with carbonate to further purify the hydrazine, and finally converted into cerium oxide, the purity is over 99%. The recovery rate of hydrazine was 55.4%. Electric Tricycle,Fully Enclosed Electric Tricycle,Elderly Electric Car,Electric Car For Elderly JIANGSU ELEGANCE VEHICLE CO., LTD. , https://www.mawayra-ev.com
April 25, 2023