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对重庆铝精矿的拜耳法溶出性能进行了研究,考察了溶出温度、石灰添加量、苛碱浓度、铝酸钠溶液中硫酸根离子的含量、溶出时间对铝精矿溶出率的影响。实验结果表明:温度对铝精矿溶出率的影响最大,其次为石灰添加量;铝精矿的合适溶出条件为温度255℃,石灰添加量10%,溶出时间为1 h。铝酸钠溶液中含有硫酸根导致铝精矿的溶出率降低,溶出矿浆中碳碱含量升高,对铝精矿溶出有不利影响。
Bayer process dissolution properties of aluminum concentrate in Chongqing were studied. The effects of dissolution temperature, lime dosage, concentration of caustic soda, content of sulfate ion in sodium aluminate solution and dissolution time on the dissolution rate of aluminum concentrate were investigated. The experimental results show that the temperature has the strongest influence on the dissolution rate of aluminum concentrate, followed by the addition of lime. The optimum conditions for the extraction of aluminum concentrate are temperature 255 ℃, lime dosage 10% and dissolution time 1 h. Sulfate contained in the sodium aluminate solution leads to a decrease in the dissolution rate of the aluminum concentrate, a rise of the carbon-alkali content in the eluted pulp, and adversely affects the dissolution of the aluminum concentrate.