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    • 72. 发明授权
    • Aluminum trihydroxide deliquoring with anionic polymers
    • 用阴离子聚合物脱铝三氢氧化铝
    • US4478795A
    • 1984-10-23
    • US434934
    • 1982-10-18
    • Maryellen HeredaStephen A. Fischer
    • Maryellen HeredaStephen A. Fischer
    • C01F7/46C01F7/06
    • C01F7/46
    • During the final stages of Al(OH).sub.3 production, deliquoring the aluminum trihydroxide slurry of excess sodium ions in the form of caustic liquor is conventionally achieved by numerous water washes prior to drying the product. Addition of an effective amount of highly charged, high molecular weight anionic polymer flocculant to the aluminum trihydroxide slurry improves the filtration rate, i.e., increases the amount and rate of removal of caustic liquor from the slurry. Addition of the flocculant reduces the amount of washing necessary to remove sodium ions from the final cake and also provides higher cake solids which results in greater production per unit time and less expenditure of energy in the drying process. Anionic polymers derived from 80 to 100% of an anionic vinyl monomer such as acrylic acid and from 20 to 0% of a nonionic vinyl monomer such as acrylamide having molecular weights between 1.5 to 12.0.times.10.sup.6 are useful in deliquoring aluminum trihydroxide slurries. Anionic polymer dosages of from about 150 to about 600 ppm may be used to treat 200 ml of about 5 to about 10% by weight of aluminum trihydroxide slurry. Higher dosages are required when aluminum trihydroxide concentrations are greater than 10% by weight.
    • 在Al(OH)3生产的最后阶段期间,以苛性液体形式过量的钠离子的三氢氧化铝浆料脱水通常在干燥产物之前通过许多水洗涤来实现。 将有效量的高电荷,高分子量阴离子聚合物絮凝剂加入到三氢氧化铝浆中改善了过滤速率,即增加苛性液体从浆料中除去的量和速率。 絮凝剂的添加减少了从最终的滤饼中除去钠离子所需的洗涤量,并且还提供了较高的饼状固体,这导致每单位时间的更大的产量和更少的干燥过程中的能量消耗。 衍生自80至100%的阴离子乙烯基单体如丙烯酸和20至0%非离子乙烯基单体(如分子量为1.5至12.0×10 6的丙烯酰胺)的阴离子聚合物可用于脱铝三水合物浆料。 可以使用约150至约600ppm的阴离子聚合物剂量来处理200ml约5至约10重量%的三氢氧化铝浆料。 当三氢氧化铝浓度大于10重量%时,需要更高的剂量。