工业水处理 ›› 2025, Vol. 45 ›› Issue (1): 146-152. doi: 10.19965/j.cnki.iwt.2023-1195

• 试验研究 • 上一篇    下一篇

预氧化酸性矿山废水制备硫酸亚铁镁谭东东

谭东东1(), 聂光华1(), 邓强2()   

  1. 1. 贵州大学矿业学院,贵州贵阳 550025
    2. 贵州省地质矿产中心试验室,贵州贵阳 550025
  • 收稿日期:2024-09-28 出版日期:2025-01-20 发布日期:2025-01-22
  • 通讯作者: 聂光华
  • 作者简介:

    谭东东(1996— ),硕士。E-mail:

    邓强,硕士,正高级工程师。E-mail:

The preparation of magnesium ferrous sulfate from pre-oxidized acid mine drainage

Dongdong TAN1(), Guanghua NIE1(), Qiang DENG2()   

  1. 1. School of Mining Engineering, Guizhou University, Guiyang 550025, China
    2. Guizhou Central Laboratory of Geology and Mineral Resources, Guiyang 550025, China
  • Received:2024-09-28 Online:2025-01-20 Published:2025-01-22
  • Contact: Guanghua NIE

摘要:

采矿过程中产生的预氧化酸性矿山废水(AMD)具有一定酸度,含有大量金属离子和硫酸盐,传统石灰中和法不仅污染环境,而且会造成资源浪费。采用纳滤—还原—真空浓缩—结晶的工艺处理预氧化AMD,并制备硫酸亚铁镁结晶产品。考察了纳滤膜对不同金属离子的截留率,探究了硫酸亚铁镁制备过程中还原条件对纳滤浓液中Fe3+还原效果的影响以及结晶条件对晶体纯度和产率的影响,并优化了工艺条件。结果表明:纳滤对所有金属离子的截留率均达到93%以上,且对铁镁的截留率达到98%;当还原反应体系pH为1.0,温度为35 ℃,反应时间为40 min时,纳滤浓液中Fe3+还原效果最佳;结晶母液浓缩比例为1∶2,结晶温度为35 ℃,搅拌速率为240 r/min时,母液中铁、镁回收率最佳,分别为31.31%、13.48%,产品纯度能达到98%以上;晶体结构分析证实制得的产品为硫酸亚铁镁。相比传统石灰中和法,该组合工艺不仅可实现预氧化AMD处理,而且可实现硫酸亚铁镁的资源回收。

关键词: 酸性矿山废水, 硫酸亚铁镁, 资源化利用, 结晶

Abstract:

The pre-oxidation acid mine drainage(AMD) generated during mining process exhibits a certain degree of acidity and contains a large amount of metal ions and sulfates. Traditional lime neutralization methods not only contribute to environmental pollution, but also cause resource wastage. This study employed a process involving nanofiltration, reduction, vacuum concentration, and crystallization to treat pre-oxidation AMD and produced magnesium ferrous sulfate crystals. The retention rate of different metal ions during nanofiltration was investigated, and the influence of Fe3+ reduction during the preparation process of magnesium ferrous sulfate were explored, along with the impact of crystallization conditions on crystal purity and yield. The results showed that the retention rate of nanofiltration for all metal ions reached over 93%, and the retention rate for iron and magnesium reached 98%. The optimal Fe3+ reduction effect occurred at pH of 1.0, temperature of 35 ℃, and reaction time of 40 minutes. When the concentration ratio of the mother liquor was 1∶2, the crystallization temperature was 35 ℃, and the stirring rate was 240 r/min, the recovery rates of iron and magnesium in mother liquor were 31.31% and 13.48%, respectively, and the purity of the product could reach more than 98%. Structural analysis of the crystals confirmed that the product was magnesium ferrous sulfate. Compared with the traditional lime neutralization method, this combination process could not only achieve pre-oxidation AMD treatment, but also realize resource recovery of ferrous magnesium sulfate.

Key words: acid mine drainage, ferrous magnesium sulfate, resource utilization, crystallization

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