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During the acid in-situ leaching of uranium, sulfuric acid readily reacts with calcite to form calcium sulfate precipitate and release CO2, which causes pore blockage and permeability reduction in the ore-bearing layer, thereby hindering the efficient and green extraction of uranium resources. To reveal the reaction characteristics and blockage mechanism of calcite in acid in-situ leaching, single-factor immersion experiments were conducted under varying acidity, particle size, and solid mass to liquid volume ratios. The variations of pH, saturation index (SI), and concentrations of Ca2+ and during the reaction were analyzed, dissolution kinetics were examined based on the shrinking core model, and the microscopic morphology and phase composition of minerals before and after the reaction were investigated by SEM-EDS and XRD. The results show that the reaction between calcium carbonate and sulfuric acid exhibits distinct stages. In the system, pH generally increases, Ca2+ concentration initially rises and then declines before stabilizing, while concentration continuously decreases and then stabilizes. Increased acidity and reduced particle size both enhance the early-stage reaction intensity and prompt the system to reach CaSO4 supersaturation earlier, thereby intensifying precipitate formation and blockage effects.A higher solid mass to liquid volume ratio increases the risk of supersaturation in the system. Kinetic fitting indicates that the reaction process better conforms to the internal diffusion control model. Microscopic characterization reveals that a flaky calcium sulfate precipitate layer forms on the mineral surface after the reaction, corroborating the above chemical analysis results. The findings provide a theoretical basis for blockage risk identification and process optimization in acid in-situ leaching of uranium.

, authors=Jiangbo YING1, 2, Yanhong ZHANG1, 2, Mengting FANG2, Xianping LUO1, 2, 3, Yue LUO1, 2, authorsList=Jiangbo YING, Yanhong ZHANG, Mengting FANG, Xianping LUO, Yue LUO, authorCompany=null, correspAuthors=Yanhong ZHANG, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1317114952733798879, articleId=1317114951408398803, tenantId=1146029695717560320, journalId=1146120122248306696, language=CN, title=酸法地浸采铀中方解石的溶出动力学及机制研究, columnId=1152626641328501305, journalTitle=湿法冶金, columnName=试验研究, runingTitle=null, highlight=null, articleAbstract=

酸法地浸采铀过程中,硫酸易与方解石反应生成硫酸钙沉淀并释放CO2,从而引起含矿层孔隙堵塞和渗透性下降,不利于铀资源的高效、绿色开采。为揭示方解石在酸法地浸中的反应特征及堵塞机制,开展了不同酸度、粒径及固液质量体积比条件下的单因素浸泡试验,分析了反应过程中pH、饱和指数SI、Ca2+和浓度的变化规律,基于缩核模型开展溶解动力学分析,并结合SEM-EDS和XRD对反应前后矿物的微观形貌与物相组成进行了机制研究。结果表明:碳酸钙与硫酸反应具有明显阶段性,体系中pH整体升高,Ca2+浓度呈先升高后回落并趋于稳定的变化特征,浓度持续下降后趋于稳定;酸度升高和粒径减小均会增强前期反应强度,并促使体系更早达到CaSO4过饱和状态,从而加剧沉淀生成与堵塞效应;较高固液质量体积比则增加了体系过饱和风险。动力学拟合结果表明,该反应过程更符合内扩散控制模型。微观表征显示,反应后矿物表面生成片状硫酸钙沉淀层,印证了上述化学分析结果。研究结果可为酸法地浸采铀过程中堵塞风险识别与工艺优化提供理论依据。

, authors=应江波1, 2, 章艳红1, 2, 方梦婷2, 罗仙平1, 2, 3, 罗跃1, 2, authorsList=应江波, 章艳红, 方梦婷, 罗仙平, 罗跃, authorCompany=null, correspAuthors=章艳红, authorNote=

应江波(2001—),男,硕士研究生,主要研究方向为地质工程。

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章艳红(1985—),女,博士研究生,副教授,主要研究方向为地浸采铀堵塞机理及解堵技术。E-mail:。
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应江波(2001—),男,硕士研究生,主要研究方向为地质工程。

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酸法地浸采铀中方解石的溶出动力学及机制研究
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应江波 1, 2 , 章艳红 1, 2 , 方梦婷 2 , 罗仙平 1, 2, 3 , 罗跃 1, 2
湿法冶金 | 试验研究 2026,45(5): 734-745
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湿法冶金 |试验研究 2026 , 45 (5) : 734 -745
酸法地浸采铀中方解石的溶出动力学及机制研究
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应江波1, 2, 章艳红1, 2 , 方梦婷2, 罗仙平1, 2, 3, 罗跃1, 2
作者信息
  • 1.东华理工大学 铀资源探采与核遥感全国重点实验室,江西 南昌 330013
  • 2.东华理工大学 核资源与环境教育部重点实验室,江西 南昌 330013
  • 3.东华理工大学 水资源与环境工程学院,江西 南昌 330013
通讯作者:
章艳红(1985—),女,博士研究生,副教授,主要研究方向为地浸采铀堵塞机理及解堵技术。E-mail:。
作者简介:

应江波(2001—),男,硕士研究生,主要研究方向为地质工程。

Dissolution Kinetics and Mechanism of Calcite in Acid In-situ Leaching of Uranium
Jiangbo YING1, 2, Yanhong ZHANG1, 2 , Mengting FANG2, Xianping LUO1, 2, 3, Yue LUO1, 2
Affiliations
  • 1.National Key Laboratory of Uranium Resource Exploration and Nuclear Remote Sensing, East China University of Technology, Nanchang 330013, China
  • 2.Key Laboratory of Nuclear Resources and Environment of Ministry of Education, East China University of Technology, Nanchang 330013, China
  • 3.School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang 330013, China
出版时间: 2026-10-20 doi: 10.13355/j.cnki.sfyj.2026.05.013
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酸法地浸采铀过程中,硫酸易与方解石反应生成硫酸钙沉淀并释放CO2,从而引起含矿层孔隙堵塞和渗透性下降,不利于铀资源的高效、绿色开采。为揭示方解石在酸法地浸中的反应特征及堵塞机制,开展了不同酸度、粒径及固液质量体积比条件下的单因素浸泡试验,分析了反应过程中pH、饱和指数SI、Ca2+和浓度的变化规律,基于缩核模型开展溶解动力学分析,并结合SEM-EDS和XRD对反应前后矿物的微观形貌与物相组成进行了机制研究。结果表明:碳酸钙与硫酸反应具有明显阶段性,体系中pH整体升高,Ca2+浓度呈先升高后回落并趋于稳定的变化特征,浓度持续下降后趋于稳定;酸度升高和粒径减小均会增强前期反应强度,并促使体系更早达到CaSO4过饱和状态,从而加剧沉淀生成与堵塞效应;较高固液质量体积比则增加了体系过饱和风险。动力学拟合结果表明,该反应过程更符合内扩散控制模型。微观表征显示,反应后矿物表面生成片状硫酸钙沉淀层,印证了上述化学分析结果。研究结果可为酸法地浸采铀过程中堵塞风险识别与工艺优化提供理论依据。

酸法地浸采铀  /  方解石  /  溶解  /  堵塞  /  缩核模型

During the acid in-situ leaching of uranium, sulfuric acid readily reacts with calcite to form calcium sulfate precipitate and release CO2, which causes pore blockage and permeability reduction in the ore-bearing layer, thereby hindering the efficient and green extraction of uranium resources. To reveal the reaction characteristics and blockage mechanism of calcite in acid in-situ leaching, single-factor immersion experiments were conducted under varying acidity, particle size, and solid mass to liquid volume ratios. The variations of pH, saturation index (SI), and concentrations of Ca2+ and during the reaction were analyzed, dissolution kinetics were examined based on the shrinking core model, and the microscopic morphology and phase composition of minerals before and after the reaction were investigated by SEM-EDS and XRD. The results show that the reaction between calcium carbonate and sulfuric acid exhibits distinct stages. In the system, pH generally increases, Ca2+ concentration initially rises and then declines before stabilizing, while concentration continuously decreases and then stabilizes. Increased acidity and reduced particle size both enhance the early-stage reaction intensity and prompt the system to reach CaSO4 supersaturation earlier, thereby intensifying precipitate formation and blockage effects.A higher solid mass to liquid volume ratio increases the risk of supersaturation in the system. Kinetic fitting indicates that the reaction process better conforms to the internal diffusion control model. Microscopic characterization reveals that a flaky calcium sulfate precipitate layer forms on the mineral surface after the reaction, corroborating the above chemical analysis results. The findings provide a theoretical basis for blockage risk identification and process optimization in acid in-situ leaching of uranium.

acid in-situ leaching of uranium  /  calcite  /  dissolution  /  blockage  /  shrinking core model
应江波, 章艳红, 方梦婷, 罗仙平, 罗跃. 酸法地浸采铀中方解石的溶出动力学及机制研究. 湿法冶金, 2026 , 45 (5) : 734 -745 . DOI: 10.13355/j.cnki.sfyj.2026.05.013
Jiangbo YING, Yanhong ZHANG, Mengting FANG, Xianping LUO, Yue LUO. Dissolution Kinetics and Mechanism of Calcite in Acid In-situ Leaching of Uranium[J]. Hydrometallurgy of China, 2026 , 45 (5) : 734 -745 . DOI: 10.13355/j.cnki.sfyj.2026.05.013
  • 国家自然科学基金项目(42372295)
  • 国家科技重大专项(2024ZD700205-1)
  • 江西省科学技术厅新型研发机构项目(20252BEA820003)
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2026年第45卷第5期
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doi: 10.13355/j.cnki.sfyj.2026.05.013
  • 接收时间:2026-06-09
  • 首发时间:2026-10-14
  • 出版时间:2026-10-20
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  • 收稿日期:2026-06-09
  • 修回日期:2026-06-29
基金
国家自然科学基金项目(42372295)
国家科技重大专项(2024ZD700205-1)
江西省科学技术厅新型研发机构项目(20252BEA820003)
作者信息
    1.东华理工大学 铀资源探采与核遥感全国重点实验室,江西 南昌 330013
    2.东华理工大学 核资源与环境教育部重点实验室,江西 南昌 330013
    3.东华理工大学 水资源与环境工程学院,江西 南昌 330013

通讯作者:

章艳红(1985—),女,博士研究生,副教授,主要研究方向为地浸采铀堵塞机理及解堵技术。E-mail:。
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https://castjournals.cast.org.cn/joweb/sfyj/CN/10.13355/j.cnki.sfyj.2026.05.013
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2种不同金属材料的力学参数
科
Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)
属
Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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