Ammoniacal leaching behavior and regularity of zinc ash

IF 1.6 4区工程技术 Q3 Chemical Engineering

International Journal of Chemical Reactor Engineering Pub Date : 2022-12-05 DOI:10.1515/ijcre-2022-0087

Hailin Long, X. Tan, Shufang Ni, Aiyuan Ma, Shiwei Li, De‐qing Zhu

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引用次数: 2

Abstract

Abstract In this work, a new hydrometallurgical process was developed to treat zinc ash produced from the hot galvanizing industry. The theoretical analysis shows the feasibility of dissolving zinc ash in the NH3–NH4Cl–H2O system, and the dissolution products are predominantly composed of Zn (NH3)4 2+. The impacts of different experimental conditions were examined, and the leaching ratio of zinc was as high as 96.4% under the conditions of NH3/NH4 + ratio of 1:1, liquid/solid of 9:1, total ammonia concentration of 8 mol/L and the stirring speed of 250 rpm at 313 K for 120 min. The kinetics of the leaching process were investigated and the calculated apparent activation energy was approximately 4.69 kJ/mol, which indicated that the zinc ash leaching process was controlled by diffusion-controlled. As revealed by the determination of impurity ions, on one hand, there were fewer impurities in the leaching solution, and the concentrations of Fe2+ and Pb2+ in solution are less than 0.02 mg/L and 0.05 mg/L respectively; on the other hand, there was no need for further impurity removal in this process. The proposed process has a certain application value in treating zinc ash.

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锌灰的氨浸行为及规律

摘要本工作开发了一种新的湿法冶金工艺来处理热镀锌工业产生的锌灰。理论分析表明，在NH3–NH4Cl–H2O体系中溶解锌灰是可行的，溶解产物主要由Zn（NH3）4 2+组成。考察了不同实验条件的影响，在NH3/NH4+比为1:1、液固比为9:1、总氨浓度为8mol/L、搅拌速度为250rpm、温度为313K、搅拌时间为120min的条件下，锌的浸出率高达96.4%。对浸出过程的动力学进行了研究，计算出的表观活化能约为4.69kJ/mol，表明锌灰浸出过程受扩散控制。杂质离子的测定表明，一方面浸出液中杂质较少，溶液中Fe2+和Pb2+的浓度分别小于0.02mg/L和0.05mg/L；另一方面，在该工艺中不需要进一步去除杂质。该工艺在处理锌灰方面具有一定的应用价值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Chemical Reactor Engineering 工程技术-工程：化工

CiteScore

2.80

自引率

12.50%

发文量

107

审稿时长

3 months

期刊介绍： The International Journal of Chemical Reactor Engineering covers the broad fields of theoretical and applied reactor engineering. The IJCRE covers topics drawn from the substantial areas of overlap between catalysis, reaction and reactor engineering. The journal is presently edited by Hugo de Lasa and Charles Xu, counting with an impressive list of Editorial Board leading specialists in chemical reactor engineering. Authors include notable international professors and R&D industry leaders.