自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第48卷    第11期    总第279期    2017年11月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2017)11-3037-07
无底柱分段崩落法不同放矿方式下崩矿步距研究
金爱兵,孙浩,孟新秋,高永涛,吴琼,张光

(北京科技大学 土木与资源工程学院,北京,100083)

摘 要: 以梅山铁矿为研究对象,在分段高度×进路间距为18 m×20 m的大结构参数下,设置不同的步距,分别采用无贫化放矿、低贫化放矿和现行截止品位放矿3种方式进行相似材料模拟实验。结合PFC2D数值模拟,分别从正面和侧面2个方向对矿石回收及废石混入进行模拟分析。研究结果表明:无贫化放矿、低贫化放矿和截止品位放矿3种出矿方式的最优崩矿步距分别为4. 5,3.8和3.8 m。无贫化放矿方式基本不破坏矿岩界面的完整性,减少矿岩的混杂机会,因而能最大限度地降低贫化;不同的放矿方式有不同最优放矿步距,当终止出矿时,步距较大,则混入废石主要来源于上部,正面残留较多;当步距较小时,正面废石会过早混入,整体回收率低;当步距适中时,正面废石和上部废石同时混入,回收效果较好。

 

关键字: 无底柱分段崩落;放矿方式;崩矿步距;相似材料模拟;数值模拟

Study of best caving steps under different ore methods of sublevel caving
JIN Aibing, SUN Hao, MENG Xinqiu, GAO Yongtao, WU Qiong, ZHANG Guang

School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China

Abstract:Choosing Meishan iron mine as the subject, similar material simulation experiments were conducted with large structural parameters of 18 m×20 m. By setting up different caving steps, three caving methods, i.e., none dilution caving method, low dilution caving method and the current cutoff caving method under different caving steps, were used. Then, the details of ore recycling and rock mixing were simulated by using PFC2D numerical simulation software. The results show that the best caving step of these three caving methods are 4.5, 3.8 and 3.8 m, respectively. Non-dilution drawing mode essentially does not destroy the integrity of the ore mine rock interface, and reduces the opportunities for mine rock hybrid, which can minimize dilution. Different methods have different optimal caving steps. When the caving step is large, waste rocks mixed in ore come from the upper and leave more positive residual. On the contrary, when the caving step is small, waste rocks from the front firstly mix into ore, resulting in low recoveries. When the caving step is medium, waste rocks from the front and up mix into ores at the same time, resulting in good recovery.

 

Key words: sublevel caving; ore method; caving step distance; similar material simulation; numerical simulation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765(中) 88836963(英) 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号