关于在不同漏条件下的离子稀土采矿区土壤中的释放模式的研究
Zhongqun Guo1,2, Qiangqiang Liu1, Feiyue Luo1
1School of Civil Engineering and Surveying and Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou, China.
PloS one
|December 15, 2025
概括
稀土采矿中的酸性液激活了土壤中 (Zn) 的释放. 3%度的硫酸 (Al2~SO4) 3显示出最大的释放量,对环境构成重大风险.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 地质化学 地质化学
背景情况:
- 来自离子型稀土矿石开采的酸性液可以在土壤中调动重金属.
- 在这些采矿区, (Zn) 污染是令人担忧的,但其在漏过程中的激活和释放机制尚未完全理解.
研究的目的:
- 研究Zn在不同水剂和度下在土壤中的激活和释放模式和机制.
- 评估与稀土矿石浸过程中动员相关的环境风险.
主要方法:
- 模拟漏实验使用三个漏剂进行:硫酸 ((NH4) 2SO4),硫酸 (MgSO4) 和硫酸 (Al2 ((SO4) 3).
- 测试了Al2(SO4)3 (1%,3%,5%,7%) 的不同度,以确定它们对的激活和释放的影响.
- 分析了液度和残留土壤 Zn 含量,并计算了土壤风险评估指数 (RAC).
主要成果:
- 液剂显著影响了的激活和释放模式.
- 溶解MgSO4导致了溶解液中最高峰Zn度.
- 2SO4) 3的漏导致残留的土壤接近高风险值,其中3%的2SO4) 3显示出最重要的转化.
- 促进Zn转换的作用是按照下列顺序进行的:Al2(SO4) 3 > (NH4) 2SO4 > MgSO4.4.
结论:
- 特别是3%度的Al2(SO4) 3是最大的环境风险,原因是的激活和释放增加.
- (NH4) 2SO4主要通过离子交换和酸化起作用,而Al2 ((SO4) 3) 则通过强酸性和矿物格子溶解起作用.
- SO4通过离子交换和土壤体结构的改变作出贡献.
- 这些发现为优化绿色采矿过程和管理稀土采矿造成的重金属污染提供了基础.
相关概念视频
00:56Extraction: Advanced Methods
1.0K
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
1.0K
01:17Precipitation and Co-precipitation
4.0K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
4.0K
03:24Common Ion Effect
45.4K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
45.4K