铀矿冶2024，Vol.43Issue(3)：17-24,8.DOI:10.13426/j.cnki.yky.2024.01.07
"CO2+O2"地浸采铀含矿层防堵技术研究
Preventing Blocking Technology of Ore-bearing Layers in"CO2+O2"In-situ Leaching of Uranium
摘要
Abstract
Blockage of ore bearing layers is the most common technical problem in in-situ leaching of u-ranium.A certain experimental mining area has been operating for about 200 days,and the injection pressure of the injection well has increased to 1.65 MPa,and the average injection flow rate has de-creased by 51.87％,and serious blockage has occurred in the surrounding ore-bearing layers.The cal-culation shows that when the natural flow field conditions are transformed into the leaching flow field conditions,the groundwater flow velocity can be rapidly increased by tens to hundreds of times.Hy-draulic erosion is the dynamic condition for the migration and precipitation of debris in the ore-bearing layers around the pumping well.The mineral debris and chemical precipitation carried in the leaching solution,which are retained in the tail liquid after surface filtration and resin bed adsorption,are re-deposited and accumulated in the ore bearing layer around the injection well,which is the direct cause of its blockage.During the research period,mechanical blockage was the main factor,accompanied by chemical precipitation blockage.Based on the research results of the maximum pore throat diameter of previous ore bearing layers,combined with underground television observation,the particle size of the leaching solution,well washing water,and the chemical composition analysis of the settling dry resi-due of the well washing water,it is determined that the mineral debris is mainly clay powder sand par-ticle level debris,and the chemical precipitation is mainly CaCO3,MgCO3,Fe(OH)3,with a small amount of FeCO3.For this reason,with the goal of"preventing blocking",a hydrocyclone separator has been added.The surface solid-liquid separation system coupled with"natural sedimentation-hydrocyclone separation-mechanical screening"has achieved obvious results,which is expected to be popularized and applied after further research.关键词
地浸采铀/"CO2+O2"/含矿层/堵塞/固液分离/水力旋流器Key words
in-situ leaching of uranium/"CO2+O2"/ore-bearing layers/blockage/solid-liquid sepa-ration/hydrocyclone separator分类
矿山工程引用本文复制引用
王亚安,李星浩,姚益轩,原渊,苏学斌,阙为民,谭亚辉,王嗣晨.."CO2+O2"地浸采铀含矿层防堵技术研究[J].铀矿冶,2024,43(3):17-24,8.基金项目
中核集团青年英才项目(地浸采铀新型地表固液分离系统研发及应用). （地浸采铀新型地表固液分离系统研发及应用）
