草酸-硫酸体系协同浸出硫铁矿渣中铁的机理及工艺优化

李晓娇; 杨晓健; 胡国涛; 陈志恒; 张昆; 郑春莉

doi:10.7652/xjtuxb202511003

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草酸-硫酸体系协同浸出硫铁矿渣中铁的机理及工艺优化

专题 “双碳”背景下的污染控制与资源化利用 | 更新时间：2025-11-11

- 草酸-硫酸体系协同浸出硫铁矿渣中铁的机理及工艺优化
- Synergistic Leaching of Iron from Pyrite Cinder Using Oxalic-Sulfuric Acid System：Mechanistic Insights and Process Optimization
- 西安交通大学学报 2025年59卷第11期页码：32-41
- 作者机构：
- 作者简介：
  
  作者简介：李晓娇（1985—），女，在职博士生；
  张昆（通信作者），男，工程师。
- 基金信息：
  
  陕西省重点研发计划资助项目(2023-ZDLSF-63);陕西省秦创源科技+工程师队伍建设资助项目(2023KXJ-169);国家自然科学基金资助项目(52374411)
- DOI：10.7652/xjtuxb202511003
  中图分类号： TF09
- 收稿：2025-03-24，
  
  纸质出版：2025-11-10
- 稿件说明：
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李晓娇, 杨晓健, 胡国涛, 等. 草酸-硫酸体系协同浸出硫铁矿渣中铁的机理及工艺优化[J]. 西安交通大学学报, 2025,59(11):32-41.

LI Xiaojiao, YANG Xiaojian, HU Guotao, et al. Synergistic Leaching of Iron from Pyrite Cinder Using Oxalic-Sulfuric Acid System：Mechanistic Insights and Process Optimization[J]. Journal of Xi'an Jiaotong University, 2025, 59(11): 32-41.
李晓娇, 杨晓健, 胡国涛, 等. 草酸-硫酸体系协同浸出硫铁矿渣中铁的机理及工艺优化[J]. 西安交通大学学报, 2025,59(11):32-41. DOI： 10.7652/xjtuxb202511003.

LI Xiaojiao, YANG Xiaojian, HU Guotao, et al. Synergistic Leaching of Iron from Pyrite Cinder Using Oxalic-Sulfuric Acid System：Mechanistic Insights and Process Optimization[J]. Journal of Xi'an Jiaotong University, 2025, 59(11): 32-41. DOI： 10.7652/xjtuxb202511003.

摘要

针对硫铁矿烧渣中铁资源回收率低、传统酸浸法效率不足的问题，提出了H

-H

协同浸出体系，通过响应面法优化浸出时间、温度、液固比及硫酸质量分数等工艺参数，并结合浸出动力学和热力学分析协同浸出机制，对浸出前后样品的形貌和物相化进行表征。结果表明：草酸通过较强的络合作用显著提升铁浸出率；响应面法优化优的H

-H

铁浸出模型准确，在浸出时间为6h、温度为90℃、液固比为6mg/L、硫酸质量分数为50%的条件下，硫铁矿烧渣中铁的浸出率达到了98.62%，与模型预测值的误差仅为0.37%；草酸优先络合铁氧化物生成可溶性[Fe（C

）

]

，硫酸则通过质子化作用加速其转化为Fe

（SO

）

，浸出过程受界面化学反应与内部扩散联合控制。此外，通过光诱导还原法从浸出液中成功回收二水合草酸亚铁，其晶体结构完整且纯度较高。该研究可为冶金废弃物资源化提供经济环保的技术方案。

Abstract

To address the low recovery efficiency of iron resources from pyrite cinder and the inefficiency of conventional acid leaching methods

a synergistic leaching system ofH

-H

is proposed. The optimization of process parameters

such as leaching time

temperature

liquid-solid ratio

and sulfuric acid concentration

is performed using response surface method. The synergistic leaching mechanism is analyzed through leaching kinetics and thermodynamics

and the morphology and phase compositions of samples before and after leaching are characterized. Results show that oxalic acid significantly enhances the iron leaching rate due to its strong complexation ability. The optimizedH

-H

model

developed using response surface method

accurately predicts the leaching efficiency. Under the optimized conditions of 6 hours of leaching time

90℃ temperature

a liquid-solid ratio of 6mg/L

and 50% sulfuric acid concentration

the iron leaching rate from pyrite cinder reaches 98.62%

with a deviation of only 0.37% from the predicted value. Oxalic acid preferentially complexes with iron oxides to form soluble [Fe (C

)

]

while sulfuric acid accelerates its conversion to Fe

(SO

)

through protonation. The leaching process is jointly controlled by interfacial chemical reactions and internal diffusion. Furthermore

ferrous oxalate dihydrate is successfully recovered from the leachate using a photo-induced reduction method

yielding crystals with high purity and intact structure. It provides an economical and environmentally friendly solution for the resource recovery of metallurgical waste.

关键词

Keywords

references

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