Optimizing Seed-Induced Nucleation for Enhanced Al(OH)3 Crystal Precipitation from Supersaturated Potassium Aluminate Solution

IF 1.5 4区 材料科学 Q3 Chemistry
Chenglin Liu, Jin Xue, Xiaoning Fang, Mengjie Luo
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引用次数: 0

Abstract

Potassium alunite is a potential mineral resource of potassium and aluminum that can serve as a valuable resource. An effective potassium and aluminum recovery method is developed using gradient leaching with a KOH sub-molten salt. The key part of this process is seeded precipitation of the potassium aluminate leach solution. Therefore, this study aims to optimize the seeded precipitation process by investigating the effects of alkali concentration, molecular ratio, stirring rate, temperature, and seed coefficient on the precipitation ratio and particle size of Al(OH)3. The results show that alkali concentration, molecular ratio, temperature, and seed coefficient are key factors influencing seeded precipitation. Furthermore, the process is optimized by using these four identified factors as variables. A 9L(34) orthogonal experiment determines optimal conditions for maximizing the precipitation ratio and achieves the desired average particle size. Under the optimal condition of 200 g L−1 alkali concentration, 1.5 molecular ratio, 1.0 seed coefficient, and 343.15 K temperature, the precipitation ratio reaches 54% and the average Al(OH)3 particle size is 114 µm. Further work is required to scale up this optimized seeded precipitation process and evaluate applications of the Al(OH)3 product.

优化种子诱导成核,从过饱和铝酸钾溶液中沉淀出更多 Al(OH)3 晶体
钾铝土矿是一种潜在的钾铝矿物资源,可作为一种宝贵的资源。利用 KOH 亚熔盐进行梯度浸出,开发了一种有效的钾铝回收方法。该工艺的关键部分是铝酸钾浸出液的种子沉淀。因此,本研究旨在通过研究碱浓度、分子比、搅拌速率、温度和种子系数对 Al(OH)3 的沉淀率和粒度的影响来优化种子沉淀工艺。结果表明,碱浓度、分子比、温度和种子系数是影响种子沉淀的关键因素。此外,将这四个确定的因素作为变量可优化工艺。通过 9L(34)正交实验确定了使沉淀率最大化的最佳条件,并达到了所需的平均粒度。在 200 g L-1 碱浓度、1.5 分子比、1.0 种子系数和 343.15 K 温度的最佳条件下,沉淀率达到 54%,Al(OH)3 平均粒径为 114 µm。需要进一步开展工作,扩大这一优化的种子沉淀过程,并评估 Al(OH)3 产品的应用。
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来源期刊
CiteScore
2.50
自引率
6.70%
发文量
121
审稿时长
1.9 months
期刊介绍: The journal Crystal Research and Technology is a pure online Journal (since 2012). Crystal Research and Technology is an international journal examining all aspects of research within experimental, industrial, and theoretical crystallography. The journal covers the relevant aspects of -crystal growth techniques and phenomena (including bulk growth, thin films) -modern crystalline materials (e.g. smart materials, nanocrystals, quasicrystals, liquid crystals) -industrial crystallisation -application of crystals in materials science, electronics, data storage, and optics -experimental, simulation and theoretical studies of the structural properties of crystals -crystallographic computing
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