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引言拜耳法溶液中的有机钠盐和碳酸钠大部份是由于铝土矿在高温下溶出时,铝土矿中的碳化物发生分解与循环溶液中的氢氧化钠反应形成的。这类杂质也会由絮凝剂和去沫剂中的碳化物以及空气中的二氧化碳形成,但如此形成的杂质为数甚少。进出拜耳法流程的碳化物量,取决于所用铝土矿类型和处理条件。其二者之差,即残留于流程中的杂质。因为拜耳法溶液在流程中循环,所以当这些杂质返复经过溶出器时,母液中杂质就逐渐从高分子化合物分解成低分子化
Introduction The organic sodium salts and sodium carbonate in the Bayer process solution are mostly formed by the dissolution of the bauxite carbide and the sodium hydroxide in the circulating solution as the bauxite dissolves at high temperatures. Such impurities are also formed by the carbides in the flocculants and defoamers and the carbon dioxide in the air, but so few are formed. The amount of carbide entering and leaving the Bayer process depends on the type of bauxite used and the treatment conditions. The difference between the two, that is left in the process of impurities. Because the Bayer process circulates in the process, impurities in the mother liquor gradually decompose from the high-molecular compound to low-molecular-weight compounds as these impurities return through the dissolver