弱酸-中-弱碱性介质中的水-碳酸钙作用——砂岩铀矿地浸过程中碳酸钙堵塞机理及其预防  

The Water-Calcite Reaction in Weakacid-Nutral-Weakalkility Media——The Mechanism of Block-up by Carbonate in Leaching and Its Protect

作　　者：祝永进 史维浚[2] 孙占学[2] 李学礼[2] 陶峰 漆璐 

机构地区：[1]江西省核工业地质局265大队,江西鹰潭335001 [2]东华理工大学,江西抚州344000 [3]核工业230研究所,湖南长沙410011 [4]江西省煤田地质局,江西南昌330001

出　　处：《东华理工大学学报（自然科学版）》2010年第4期369-373,共5页Journal of East China University of Technology(Natural Science)

摘　　要：从讨论水碳酸钙作用的机理着手,提出碳酸钙的溶解沉淀作用受水中钙离子、重碳酸根离子和pH三因素影响,而他们之间以反相关关系互相制约。然后从碳酸钙溶解沉淀边界条件的确定和制约碳酸钙溶解沉淀的三因素来讨论砂岩铀矿地浸过程中碳酸钙堵塞机理及其预防方法,提出降低溶浸液的钙离子含量和适当减小溶浸液的pH,是提高溶浸液的重碳酸根(浸铀剂)浓度的有效措施,确保溶浸液的重碳酸根、钙离子含量和pH在其边界条件以内,可以在保证不发生碳酸钙沉淀前提下,尽可能地提高浸铀效率。This paper introduces the mechanism of water-calcite reaction,and this reaction is controlled by 3 factors,they are content of calcium and hydrocarbonate and pH,and which are related each other reversely.This paper discussed the boundary value of these 3 factors.Decreasing the contents of calcium and pH is the effective method to increase the content of hydrocarbonate,which is served as reagent for leaching uranium.Be sure that the contents of calcium and hydrocarbonate and the pH value are below the boundaries of them,which is the method to protect the blocking up by carbonate during the leaching process.

关 键 词：地浸 堵塞 水岩作用 碳酸钙 

分 类 号：TL212[核科学技术—核燃料循环与材料]