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为确定轻烧氧化镁浸取过程的最优控制参数,采用硫酸铵作为浸取剂,考察了浸取体系温度、硫酸铵初始浓度以及轻烧氧化镁颗粒粒度对浸取反应动力学的影响,并得到了宏观反应动力学方程式。结果表明:在一定的浸取剂初始浓度和固体反应颗粒粒度范围内,该浸取反应过程符合Crank-Kinstelin-Browhetein模型;表观反应活化能为57.41kJ/mol,属表面化学反应控制类型。当硫酸铵与氧化镁初始物质的量之比大于2时,反应过程逐渐由Crank-Kin-stelin-Browhetein模型向减缩核模型过渡。当轻烧氧化镁颗粒初始粒度较大时,浸取反应过程也呈现上述过渡趋势。
In order to determine the optimum control parameters of light-burned magnesia leaching process, ammonium sulfate was used as the leaching agent to study the effects of the leaching system temperature, the initial concentration of ammonium sulfate and the particle size of light-burned magnesia on the leaching reaction kinetics. And got the macroscopic reaction kinetic equation. The results show that the leaching reaction accords with Crank-Kinstelin-Browhetein model within the range of initial leaching agent concentration and solid reaction particle size. The apparent activation energy is 57.41 kJ / mol, belonging to the controlled chemical reaction type. When the ratio of the amount of ammonium sulfate and magnesium oxide initial material is more than 2, the reaction process gradually transitions from the Crank-Kin-stelin-Browhetein model to the reduced nuclear model. When the initial particle size of light-burned magnesia particles is larger, the leaching reaction process also shows the above-mentioned transition trend.