风化壳淋积型稀土矿浸取分形动力学研究

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风化壳淋积型稀土矿粒径分布特征是影响浸取性能的主要因素之一.以五种重组江西风化壳淋积型稀土矿为研究对象,通过柱浸实验和分形理论相结合的研究手段,探究稀土矿的粒径分布特征与分形维数的关系,以及其对浸取动力学性能的影响规律.结果表明,随着分形维数增大,小粒径颗粒质量含量随之增大,而大粒径颗粒质量含量随之减少,尤其是小于0.150 mm和大于1.400 mm粒径颗粒质量占比变化幅度较大,其余粒径颗粒变化幅度较小.随着分形维数增加,浸出的稀土浓度峰值逐渐增大,浸矿中稀土浓度峰值出现的时间变晚,稀土浸取率达到平衡所需要的时间变长.基于分形理论,构建了风化壳淋积型稀土矿浸取分形动力学模型,并证实了新模型具有较高的准确性,能够较好的定量描述浸矿中不同分形维数的稀土矿样的浸取动力学特性.
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