| 基于扩散度的尾砂膏体流变特性 |
| |
| 作者姓名： | 陈鑫政 杨小聪 郭利杰 许文远 魏晓明 |
| |
| 作者单位： | 1.矿冶科技集团有限公司，北京 102628 |
| |
| 基金项目： | 国家重点研发计划资助项目(2018YFE0123000) |
| |
| 摘 要： | 借鉴水泥净浆流动度测试方法，引入扩散度参数判别尾砂膏体的流变特性，开展试验研究分析扩散度与尾砂膏体质量分数（Cw）、灰砂比、屈服应力和黏度系数的关系，根据5个矿山的扩散度和流变参数测试结果，构建扩散度与屈服应力的经验模型，并与推导的解析模型作对比。结果表明:尾砂膏体的扩散度主要与质量分数有关，灰砂比对其影响不显著，随质量分数、屈服应力和黏度的增加而减小，质量分数为68%、70%和72%的尾砂膏体的扩散度分别为20.37、17.22和12.44 cm；尾砂膏体的扩散度与屈服应力的变化趋势相吻合，二者呈指数型函数关系，经验模型计算得到的屈服应力与测试结果误差在25%范围内，且尾砂膏体质量分数越大，二者的误差越小，达到10%以内；解析模型与经验模型计算所得的屈服应力在扩散度为12～16 cm之间结果较接近，解析模型计算结果整体上高于测试值；相比于坍落度，扩散度测试简便易操作，扩散度能有效表征尾砂膏体的流变特性，指导矿山现场充填。
|
| 关 键 词： | 膏体 扩散度 灰砂比 屈服应力 黏度系数 |
| 收稿时间： | 2020-02-18 |
Rheological properties of tailings paste based on a spread test |
| |
| Affiliation: | 1.BGRIMM Technology Group, Beijing 102628, China2.National Centre for International Research on Green Metal Mining, Beijing 102628, China |
| |
| Abstract: | Paste backfill is similar to surface paste disposition. Paste backfill technology is an innovative method of treating tailings, which is carried out beneath the earth. This process is widely used worldwide in many metal mining industries due to its advantages in safety, environmental protection, and high economic benefit. The rheological properties of paste backfill are essential factors in pipeline design. After analyzing paste backfilling practices for a long time, it is concluded that the slump determined according to concrete standards is not suitable for paste backfill of tailings. To increase the efficiency of the process, a spread parameter was introduced in the cement slurry flow test method to investigate the rheological properties of the paste backfill. Experiments were conducted to analyze the relationship between spread and other factors such as mass fraction (Cw) of paste backfill, cement-tailings ratio, yield stress, and viscosity. Based on the test results of spread and rheological parameters of paste backfill of tailings in five mines, the empirical model representing spread and yield stress of paste backfill of tailings was constructed and compared with the deduced analytical model. The results show that the spread of paste backfill is mainly related to mass fraction, and the effect of cement-tailings ratio on it is small. The spread of paste backfill decreases with the increase in mass fraction, yield stress, and viscosity. The spread of paste backfill of tailings with mass fraction of 68%, 70% and 72% are 20.37, 17.22 and 12.44 cm, respectively. Spread of paste backfill has an exponential relationship with its yield stress. The error between the yield stress calculated using empirical model and the actual test is within 25%, and decreases with the increase in mass fraction of paste backfill, which will be within 10%. The yield stress calculated using analytical model and empirical model are more or less the same when the spread of paste backfill of tailings is between 12 cm and 16 cm. The calculated yield stresses of analytical model are generally higher than actual test values. Compared with the slump, the spread test is simple and easy to operate, which can adequately characterize the rheological properties of paste backfill of tailings and guide in-situ backfilling. |
| |
| Keywords: | |
|
| 点击此处可从《》浏览原始摘要信息 |
|
点击此处可从《》下载全文 |
|
