Phase conversion characteristics of lead sulfate in ferric sulfate medium

IF 12.2 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL Journal of Hazardous Materials Pub Date : 2024-11-19 DOI:10.1016/j.jhazmat.2024.136577

Pu Sun, Jibo Wang, Xingbin Li, Chang Wei, Zhigan Deng, Minting Li

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Abstract

The phase transformation characteristics of lead sulfate (PbSO₄) in a sulfuric acid (H₂SO₄) system were studied, focusing on the effects of temperature, H₂SO₄ concentration, ferric iron (Fe³⁺) concentration, sodium sulfate (Na₂SO₄), and potassium sulfate (K₂SO₄). The conversion of PbSO₄ was analyzed by characterizing the composition and structure of the solid product through XRD, SEM/BSE-EDS, and FT-IR. The results indicated that the effect of temperature on PbSO₄ transformation was influenced by H₂SO₄ concentration. The temperature threshold for PbSO₄ conversion to lead jarosite (Pb-J) decreased from 150 to 90℃ as H₂SO₄ concentration decreased from 20 to 5 g/L. At 150℃, the amount of jarosite generated decreased significantly from 86.04 to 9.76%. Subsequently, when H₂SO₄ concentration exceeded 40 g/L, PbSO₄ was essentially unchanged. Concurrently, Pb-J formation correlated with the partial formation of hydronium jarosite (H-J). The production of jarosite was inhibited when the solution pH was ~ 0.3 or lower. Furthermore, the increase in Fe³⁺ concentration facilitated Pb-J formation, whereas Na₂SO₄ and K₂SO₄ inhibited Pb-J formation, leading to the formation of potassium jarosite (K-J) and sodium jarosite (Na-J), respectively. This study provided insights into regulating PbSO₄ conversion during sulfide ore oxygen pressure leaching.

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硫酸铅在硫酸铁介质中的相变特性

研究了硫酸（H2SO4）体系中硫酸铅（PbSO4）的相变特性，重点关注温度、H2SO4 浓度、铁（Fe3+）浓度、硫酸钠（Na2SO4）和硫酸钾（K2SO4）的影响。通过 XRD、SEM/BSE-EDS 和 FT-IR 表征固体产物的组成和结构，分析了 PbSO4 的转化情况。结果表明，温度对 PbSO4 转化的影响受 H2SO4 浓度的影响。当 H2SO4 浓度从 20 克/升降低到 5 克/升时，PbSO4 转化为硬玉铅（Pb-J）的温度阈值从 150℃降低到 90℃。在 150℃ 时，生成的金刚石数量从 86.04% 显著下降到 9.76%。随后，当 H2SO4 浓度超过 40 g/L 时，PbSO4 基本保持不变。同时，Pb-J 的形成与部分水合焦石棉（H-J）的形成相关。当溶液 pH 值约为 0.3 或更低时，酒石的生成受到抑制。此外，Fe3+ 浓度的增加促进了 Pb-J 的形成，而 Na2SO4 和 K2SO4 则抑制了 Pb-J 的形成，分别导致了钾金刚石（K-J）和钠金刚石（Na-J）的形成。该研究为硫化矿氧压浸出过程中 PbSO4 转化的调控提供了见解。

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来源期刊

Journal of Hazardous Materials 工程技术-工程：环境

CiteScore

25.40

自引率

5.90%

发文量

3059

审稿时长

58 days

期刊介绍： The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.