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拜耳法生产氧化铝中,溶出工序和分解工序是两个最重要的环节。溶出工序是将铝矿石、苛碱和石灰按照一定的比例混合,在高温高压的条件下生成铝酸钠溶液的过程,而分解是把铝酸钠溶液降温并加入晶种(氢氧化铝)搅拌使其析出氢氧化铝的过程。溶出过程中溶出Rp值(即铝酸钠溶液中氧化铝与苛性碱的质量比,是衡量循环母液中所溶解氧化铝量的指标,溶出Rp值是反映原料磨铝土矿和循环母液配比以及溶出效果的质量特性值。)不能过高,否则铝土矿会进入赤泥,造成巨大的浪费。而高Rp值的铝酸钠溶液分解率更,并且提高了产品质量和产能。因此在溶出后分解前的工序中提高铝酸钠溶液的Rp值对生产是一个非常有利的途径。
Bayer production of alumina, the dissolution process and decomposition process are the two most important aspects. Dissolution process is aluminum ore, caustic soda and lime in accordance with a certain ratio of mixing, under high temperature and pressure conditions, the process of generating sodium aluminate solution, and the decomposition is the sodium aluminate solution cooling and adding seed (aluminum hydroxide) stirring Make it precipitate aluminum hydroxide process. Leaching Rp value during the dissolution (ie, the mass ratio of alumina to caustic in sodium aluminate solution is an indicator of the amount of dissolved aluminum in the circulating mother liquor. The value of dissolved Rp reflects the ratio of raw material bauxite to recycled mother liquor As well as the quality characteristics of the dissolution effect.) Do not overdo it, or bauxite will enter the red mud, causing a huge waste. The high Rp value of sodium aluminate solution decomposition rate and improve product quality and productivity. Therefore, increasing the Rp value of the sodium aluminate solution in the pre-decomposition process after the dissolution is a very advantageous way of production.