摘要
柴达木盆地察尔汗盐湖赋存储量可观的低品位固体钾盐矿,其主要的开发方式为液化开采。本文对比分析了霍布逊区段盐湖资源大规模开采前(2004年)和开采后(2011年和2019年)典型钻孔岩芯孔隙度、固体钾矿含量、卤水组分变化特征,评价了钾盐液化开采效率。结果表明:由于大规模采卤使得大量高矿化度卤水被带出,而低矿化度水体补给储卤层孔隙并溶解盐层中盐类矿物,使得储卤层孔隙率有逐渐增大趋势;卤水中主要组分KCl和NaCl浓度均出现降低现象,而MgCl_(2)则出现增加趋势,这主要与补水工程及补给水体中兑卤有关。在这期间,卤水矿中KCl品位下降幅度要小于固体矿床KCl品位下降幅度,说明卤水溶解了石盐层中大量固体低品位钾矿,提升了其KCl品位。本次研究对于优化霍布逊区段固体钾盐液化开采方案具有重要的指导意义。
Qarhan Salt Lake in Qaidam Basin has a considerable amount of low-grade solid potassium salt ore;developed mainly through water-replenishing dissolved liquefaction mining.This paper compares and analyzes the characteristics of typical drilling core porosity,solid potassium ore content,and halogen composition change before(2004)and after(2011 and 2019)large-scale exploitation of salt lake resources in Hobson District,and the efficiency of potassium salt liquefaction mining is evaluated.The results show that a large number of high-mineralized brines are brought out due to large-scale brine mining,while the low mineralization water recharge reservoir pores dissolve salt minerals in the salt layer,gradually increasing the porosity of the reservoir.During this period,the KCl grade drop in brine ore was less than the decrease in the KCl grade of solid deposit.This showed that the brine dissolved a large number of solid low-grade potassium ore in the stone salt layer,raising its KCl grade.This paper is of great significance for the optimization of solid potassium salt liquefaction mining scheme in the Qaidam Basin.
作者
韩光
袁小龙
韩积斌
刘久波
范增林
胡燕
张西营
HAN Guang;YUAN Xiao-long;HAN Ji-bin;LIU Jiu-bo;FAN Zeng-lin;HU Yan;ZHANG Xi-ying(Key Laboratory of Exploration Research of Salt Lake Resources in Qaidam Basin of Qinghai Province,Qaidam Comprehensive Geological and Mineral Exploration Institute of Qinghai Province,Golmud,Qinghai 816099;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing,Jiangsu 210098;Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,Qinghai 810008)
出处
《地球学报》
CAS
CSCD
北大核心
2022年第3期279-286,共8页
Acta Geoscientica Sinica
基金
青海学者专项(编号:QHS201802)
国家自然科学基金项目(编号:41807216)
中国科学院重点部署项目(编号:ZDRW-ZS-2020-3)
青海省应用基础研究计划项目(编号:2020-ZJ-765)
第二次青藏高原综合科学考察研究项目(编号:2019QZKK0805)联合资助。
关键词
低品位固体钾矿
固液转化
水溶开采
察尔汗盐湖
霍布逊区段
柴达木盆地
ultra-low-grade solid potassium ore
solid-liquid conversion
water solution mining
Qarhan Salt Lake
Huobuxun area
Qaidam Basin
作者简介
第一作者:韩光,男,1983年生。硕士,高级工程师。主要从事盐湖及盐类矿床勘查和研究工作。通讯地址:816099,青海省柴达木综合地质矿产勘查院、青海省柴达木盆地盐湖资源勘探研究重点实验室。E-mail:114472026@qq.com;通讯作者:袁小龙,男,1984年生。硕士,助理研究员。通讯地址:810008,青海省西宁市城西区新宁路18号。E-mail:xiaolongy@isl.ac.cn。
