在铀矿石工艺矿物学研究中引入CT技术的探索

Discussion on Application of CT Technology in the Mineralogy of Uranium Ore

为加强对矿石微裂隙及其与目标矿物之间的分布关系研究,提高工艺矿物学研究在水冶工艺中的作用,文章以棉花坑铀矿石为例进行了工艺矿物学研究,并引入X射线三维显微CT技术,从三维数字化角度对原矿颗粒中的金属矿物和孔裂隙结构的相关参数进行了统计、处理和对比。研究表明,棉花坑铀矿石矿物成分简单,影响选冶的有害组分少,铀以易选冶的沥青铀矿、铀黑和硅钙铀矿形式存在,部分沥青铀矿充填矿物裂隙或溶蚀孔洞,微裂隙与铀矿物等金属矿物的分布形态和区域重合度较低,可能导致溶浸液不能充分与其接触从而影响浸出效果,需对棉花坑铀矿石进一步细磨,提高超细铀矿物的解离程度,改善堆浸效果。通过引入CT技术,有效提取了矿石颗粒中不同组分的三维形态和分布图像,并计算出不同组分体积占比,该方法得到的参数相对可靠、稳定,具有参考价值。

In order to strengthen the research on the distribution relationship between ore microcracks and target minerals,and improve the role of mineralogy of hydrometallurgy process,ores from Mianhuakeng uranium deposit was studied as the case of three-dimensional X-ray microscopic CT technology.The 3D Xray microscopic CT was used to processing and comparing the parameters of metallic minerals and pores in raw ore.The results showed that the mineral composition of the uranium ore is simple,and the harmful components affecting the metallurgy are few.Uranium exists in the form of pitchblende,uranium-black and uranophane,which are easy to be leached.Some of the pitchblendes fill mineral cracks or dissolution pores.The distribution form and regional overlap between microcracks and metallic minerals such as uranium minerals are low,which may lead to insufficient contact between the leaching solution and uranium minerals,thus affecting the leaching effect.Further fine grinding of ores from Mianhuakeng uranium deposit can improve the degree of liberation of ultrafine uranium minerals and improve the heap leaching effect.By introducing CT technology,the three-dimensional morphology and distribution images of different components in ore particles are extracted effectively,and the volume proportion of different components was calculated.The parameters obtained by this method are relatively reliable and stable,which has reference value.