新疆512矿床砂岩型铀矿孔隙特征及渗流模拟

刘亚玲; 黎广荣; 周义朋; 孙占学; 赵凯; 刘金辉; 徐玲玲

doi:10.19509/j.cnki.dzkq.tb20230134

新疆512矿床砂岩型铀矿孔隙特征及渗流模拟

doi: 10.19509/j.cnki.dzkq.tb20230134

刘亚玲^{a, b,},
黎广荣^{a, b, ,},
周义朋^a,
孙占学^a,
赵凯^a,
刘金辉^a,
徐玲玲^a

a.
东华理工大学核资源与环境国家重点实验室, 南昌 330013
b.
东华理工大学地球科学学院, 南昌 330013

基金项目:

国家自然科学基金项目 42072285

国家自然科学基金项目 41772266

中央引导地方科技发展专项 2018ZDB40001

详细信息

作者简介:
刘亚玲, E-mail: 2444098532@qq.com

通讯作者:
黎广荣, E-mail: liguangrong0086@ecut.edu.cn

中图分类号: P619.14
计量
- 文章访问数: 178
- PDF下载量: 78
- 被引次数: 0
出版历程
- 收稿日期: 2023-03-13
- 录用日期: 2023-07-17
- 修回日期: 2023-04-27

Pore characteristics and seepage simulation of sandstone-type uranium ore in the 512 deposit, Xinjiang

a.
State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China
b.
School of Earth Sciences, East China University of Technology, Nanchang 330013, China

More Information

Author Bio:
LIU Yaling, E-mail: 2444098532@qq.com

Corresponding author: LI Guangrong, E-mail: liguangrong0086@ecut.edu.cn

摘要

摘要:
地浸采铀工艺是溶浸液在含矿含水层中与铀矿物发生反应, 铀元素随溶浸液迁移至地表的一种提铀工艺, 精确了解矿区岩石内部结构及金属矿物的分布, 对地浸工艺应用具有重要的指导意义。为了解512矿床岩石内部结构及渗流路径, 选取该矿床代表性围岩和矿石岩心进行CT扫描, 经过图像降噪滤波、图像分割提取孔隙、构建孔隙网络模型等处理与分析, 获得各孔喉参数; 通过Avizo软件模拟得到绝对渗透率、迂曲率和渗流速度变化。结果表明: 围岩和矿石的孔隙度相近, 分别为15.42%, 15.18%;连通孔隙度分别是9.61%, 13.82%。围岩中高密度物质为一些金属矿物, 体积分数约为0.54%, 矿石中高密度矿物多为次生铀矿物, 体积分数为1.06%, 其在浸出过程中可与溶浸液充分接触。孔隙内部具有强烈的非均质性, 导致流速在流动路径中逐渐降低。围岩和矿石连通的大孔数量多于小孔, 指示大孔是决定孔隙发育程度的主要因素。根据速度流线推断围岩和矿石中虽然存在堵塞区, 但流通区域占主导地位。
- 砂岩型铀矿 /
- 地浸采铀 /
- CT扫描 /
- 孔隙特征 /
- 渗流模拟 /
- 新疆512矿床
Abstract: Objective
In situ leaching is a uranium extraction process in which a solution reacts with uranium-bearing minerals in a saturated aquifer and then uranium in the flowing solution is extracted through exchange. To understand the internal structure and seepage path of the 512 deposits,
Methods
representative wallrock and ore cores of the deposit were selected for CT scanning, and the pore throat parameters were obtained via image noise reduction filtering, image segmentation to extract pores, and the construction of pore network models. The changes in the absolute permeability, tortuosity and seepage velocity are simulated with Avizo software.
Results
The results showed that the porosity of the wallrock was 15.42%, the connected porosity was 9.61%, the ore porosity was 15.18%, the connected porosity was 13.82%, and the water permeability was better than that of the wallrock. The high-density materials in the wallrock are metal minerals, accounting for approximately 0.54%, and most of the high-density minerals in the ore are secondary uranium minerals, accounting for 1.06%. It can be fully in contact with the solution during the leaching process.
Conclusion
There is strong heterogeneity inside the pores, which causes the flow rate to gradually decrease in the flow path. The number of large pores connecting the wallrock and ore is greater than that of small pores, indicating that large pores are the main factors determining the degree of pore development. According to the velocity streamlines, although there is a blockage area in the wallrock and ore, the circulation area is dominant.
- sandstone-type uranium deposit /
- in-situ leaching of uranium /
- CT scan /
- pore characteristic /
- seepage simulation /
- 512 deposit, Xinjiang
注释:

所有作者声明不存在利益冲突。

HTML全文

图 1 新疆512矿床岩心样品

a, b.野外岩心特征; c.围岩单偏光镜下特征; d.矿石反射光镜下特征; Kp.钾长石; Q.石英; Py.黄铁矿

Figure 1. Drill cores of the 512 deposit, Xinjiang

下载: 全尺寸图片幻灯片

图 2 围岩及矿石二维CT断层图像及三维岩心

Figure 2. Two-dimensional CT fault images and three-dimensional cores of wallrock and ore

下载: 全尺寸图片幻灯片

图 3 围岩和矿石中值滤波处理图像

a.围岩滤波前；b.围岩滤波后；c.矿石滤波前；d.矿石滤波后

Figure 3. Median filtering processes for the image of wallrock and ore

下载: 全尺寸图片幻灯片

图 4 孔隙度与边长体素变化规律曲线图

Figure 4. Change law curve of the porosity and side length voxel

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图 5 围岩与矿石阈值分割前后对比

a.围岩阈值分割前；b.围岩阈值分割后；c.矿石阈值分割前；d.矿石阈值分割后; 蓝色为孔隙，灰色为岩石骨架; 下同

Figure 5. Comparison before and after threshold segmentation of wallrock and ore

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图 6 围岩及矿石孔隙分布情况

a.围岩孔隙与基质；b.围岩孔隙；c.矿石孔隙与基质；d.矿石孔隙

Figure 6. Pore distribution of the wallrock and ore

下载: 全尺寸图片幻灯片

图 7 样品逐层面孔隙度分布图

Figure 7. Layer-by-layer surface porosity distribution of the sample

下载: 全尺寸图片幻灯片

图 8 围岩和矿石连通孔隙与孤立孔隙分布

a.围岩连通孔隙；b.矿石连通孔隙；c.围岩孤立孔隙；d.矿石孤立孔隙

Figure 8. Connected pore versus isolated pore distribution of wallrock and ore

下载: 全尺寸图片幻灯片

图 9 孔隙网络模型及内部展示

a.围岩网络模型；b.矿石网络模型；c.围岩模型内部展示；d.矿石模型内部展示

Figure 9. Pore network model and internal display

下载: 全尺寸图片幻灯片

图 10 围岩、矿石孔隙等效半径及配位数分布直方图

Figure 10. Histogram of the equivalent radius and coordination distribution of the wallrock and ore pores

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图 11 围岩、矿石孔隙等效半径及长度分布直方图

Figure 11. Histogram of the radius and lengths distribution of the wallrock and ore throats

下载: 全尺寸图片幻灯片

图 12 围岩、矿石高密度金属矿物分布与孔隙接触关系

a.围岩金属矿物分布；b.围岩矿物与孔隙(红色为金属矿物；蓝色为孔隙)；c.矿石金属矿物分布；d.矿石矿物与孔隙(红色为金属矿物, 蓝色为孔隙)

Figure 12. Relationship between the distribution of wallrocks and ore high-density metal minerals and pores contacts

下载: 全尺寸图片幻灯片

图 13 围岩和矿石扫描电镜照片

a, b.矿石样品; c, d.围岩样品; Pit.沥青铀矿；Py.黄铁矿

Figure 13. Scan electron microscopy photos of wallrock and ore

下载: 全尺寸图片幻灯片

图 14 围岩、矿石渗流速度流线图

a.围岩模拟流线；b.矿石模拟流线; 流线颜色从红色、黄色、绿色再到蓝色表示流速依次降低

Figure 14. Flow velocity streamline of the wallrock and ore

下载: 全尺寸图片幻灯片

表 1 围岩和矿石不同边长体素正方体孔隙度

Table 1. Porosity of cubes with different side lengths voxels of wallrock and ore

序号	边长体素	围岩孔隙度/%	矿石孔隙度/%
1	200	19.73	10.19
2	300	18.18	9.78
3	400	16.97	10.77
4	500	17.63	12.59
5	600	16.40	13.26
6	700	16.18	14.02
7	800	15.42	15.18
8	900	15.51	15.51
9	1 000	16.00	15.92

下载: 导出CSV

表 2 样品渗流模拟结果

Table 2. Seepage simulation results for the wall rock samples

样品	方向	流量/mm³	迂曲率	绝对渗透率/10^-3 μm²
矿石	X	8.67	1.98	344.8
	Y	6.71	1.87	266.9
	Z	5.81	1.71	231.1
围岩	X	0.53	1.89	13.3
	Y	0.54	2.02	13.5
	Z	0.13	1.83	3.2

下载: 导出CSV

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