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    • 82. 发明授权
    • Process for purifying industrial waste gases containing fluorine values
    • 用于净化含有荧光值的工业废气的方法
    • US3660019A
    • 1972-05-02
    • US3660019D
    • 1970-01-29
    • UNIVERSAL OIL PROD CO
    • PREDIKANT HANS HBETZ HERMANNSCHAFFER JOHANN
    • B01D53/68B01D47/06B01D53/77C01D3/02
    • B01D47/06Y02C20/30Y10S210/915
    • Fluorine values are recovered from industrial waste gases containing fluorine and/or hydrogen fluoride, notably from gases evolved in the manufacture of aluminum through electrolysis of alumina in the presence of cryolite, by scrubbing with a highly acidic aqueous solution containing hydrogen fluoride in a first washing zone and then with an aqueous sodium hydroxide solution with formation of sodium fluoride in solution without precipitation in a second washing zone, splitting the stream of solution from each washing zone into a recycle stream for return to the zone wherein it was formed, and into a precipitation stream, and the two precipitation streams are combined to precipitate sodium fluoride, which is recovered with recirculation of resultant mother liquor to the first washing zone.
    • 从含有氟和/或氟化氢的工业废气中回收氟值,特别是通过在冰晶石存在下电解氧化铝,通过在第一次洗涤中用含氟化氢的高酸性水溶液洗涤而在铝制造中产生的气体 然后用氢氧化钠水溶液在溶液中形成氟化钠而不在第二洗涤区中沉淀,将来自每个洗涤区的溶液流分解成再循环流,以返回到其形成的区域,并进入 并将两个沉淀流合并,以沉淀出氟化钠,通过将所得母液再循环至第一洗涤区回收氟化钠。
    • 83. 发明授权
    • Process for the production of high quality synthetic cryolite
    • 生产高品质合成CRYOLITE的方法
    • US3656894A
    • 1972-04-18
    • US3656894D
    • 1970-05-08
    • CENTRAL GLASS CO LTD
    • KADOTANI MAKOTOISOBE SEISHIRO
    • C01F7/54C01D3/02C01F7/50
    • C01F7/54
    • Process for producing high quality synthetic cryolite which comprises mixing a fluoride mixed solution obtained by the ammoniation of sodium silico-fluoride and being free from a filtrable silica with a solution of sodium aluminate of an Na2O/AL2O3 molar ratio above 1.0, the 6F/A1 ratio in the mixed solution being maintained within the range between 1.0 and 1.2 thereby to adjust the pH of the mixed solution within the range of 8 to 12 without any neutralization procedure, and reacting the mixture at a temperature from 60* C. to the boiling point of the reaction solution in the presence of seeds of cryolite. The synthetic cryolite so obtained contains no chiolite and suffers from very little ignition loss.
    • 用于生产高品质合成冰晶石的方法,其包括将通过氨化氟化钠的氨化得到的不含可过滤二氧化硅的氟化物混合溶液与Na 2 O / Al 2 O 3摩尔比高于1.0的铝酸钠溶液混合,6F / A1 混合溶液中的比例保持在1.0至1.2的范围内,从而将混合溶液的pH调节在8至12的范围内,无需任何中和操作,并将混合物在60℃的温度下与沸点 在冰晶石种子存在下的反应溶液点。 如此获得的合成冰晶石不含氯硫酸盐,并且具有极少的灼烧损失。