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用三因子二次回归正交设计方案,对黔中铝土矿进行溶出试验。实验结果经处理后得到氧化铝的溶出率(η_A,％)与溶出温度(℃,X_3)、苛性碱浓度(g/L,X_2)和石灰添加量(％,X_1)相互关系的数学模型: η_A=817.7+13.48X_1-0.485X_2-6.484X_3-4.673×10~(-3)X_1X_2-3.551×10~(-2)X_1X_3-2.739×10~(-4)X_2X_3-0.1839X_1~2+1.491×10~(-3)X_2~2+1.479×10~(-2)X_3~2利用该数学模型可以指导生产,寻找更经济合理的高压溶条件。在其它溶出条件一定时,石灰添加量有一最佳值,该值随温度的升高而减小,ηA值却增大。但生产上不宜超过这一最佳值太多,否则会使技术经济指标恶化。本实验发现石灰的添加量与溶出温度的交互作用是不容忽视的。贵工1~#催化添加剂,能使η_A提高6.6～11.2％。这是一个很有使用价值的添加剂。
With the three-factor quadratic regression orthogonal design scheme, the bauxite in Guizhou province was tested for dissolution. The experimental results obtained the mathematical model of the relationship between the dissolution rate of aluminum oxide (η_A,%) and the dissolution temperature (℃, X_3), caustic alkali concentration (g / L, X_2) and the amount of lime added η_A = 817.7 + 13.48X_1-0.485X_2-6.484X_3-4.673 × 10 -3 X_1X_2-3.551 × 10 -2X_1X_3-2.739 × 10 -4X_2X_3-0.1839X_1 -2 + 1.491 × 10 ~ (-3) X_2 ~ 2 + 1.479 × 10 ~ (-2) X_3 ~ 2 The mathematical model can be used to guide the production and seek a more economical and reasonable high pressure dissolving conditions. When the other dissolution conditions are certain, the amount of lime added has an optimum value, which decreases with increasing temperature and the value of ηA increases. However, production should not exceed this optimal value too much, otherwise it will make technical and economic indicators worse. The experiment found that the addition of lime and the dissolution temperature of the interaction can not be ignored. Expensive 1 ~ # catalytic additives, can make η_A increased 6.6 ~ 11.2%. This is a very valuable additive.