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一水硬铝石型铝土矿的溶出性能可以通过焙烧而显著提高。当其它作业条件相当时,焙烧铝土矿在225℃下的Al_2O_3溶出率与原矿在260℃下的溶出率相同。应用抛物线插值优化法确定了最宜的焙烧制度。实验表明,焙烧之后,一水硬铝石脱水并转化为无定形氧化铝和/或结晶很差的刚玉,其化学活性和矿石的孔隙率增大,原矿中分散存在的锐钛矿成为敞露的,因而客易与氧化钙反应,而且所需的C_2O量可以减少。所有这些因素都促使一水硬铝石型铝土矿的溶出性能改善。
The digestion performance of diasporic bauxite can be significantly increased by calcination. When the other operating conditions are equivalent, the dissolution rate of Al 2 O 3 at 225 ℃ is the same as the dissolution rate of raw ore at 260 ℃. Parabolic interpolation optimization method was used to determine the optimum calcination system. Experiments show that after calcination, diasporum is dehydrated and converted to amorphous alumina and / or poorly crystalline corundum, its chemical activity and the porosity of the ore increases, the presence of anatase dispersed in the ore becomes open , And therefore easy to react with the calcium oxide, and the required C_2O can be reduced. All of these factors contribute to the improved dissolution of diasporic bauxite.