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Gold Science and Technology ›› 2021, Vol. 29 ›› Issue (3): 364-371.doi: 10.11872/j.issn.1005-2518.2021.03.002

• Mining Technology and Mine Management • Previous Articles     Next Articles

Experimental Study on the Ore-drawing Port Size Based on Inserts Ore Drawing Technique

Gan ZHANG(),Ganqiang TAO(),Yuxuan WU   

  1. School of Resource Environment and Safety Engineering，University of South China，Hengyang 421001，Hunan，China
  • Received:2020-12-22 Revised:2021-01-18 Online:2021-06-30 Published:2021-07-14
  • Contact: Ganqiang TAO E-mail:736998733@qq.com;nhutgq@126.com

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Abstract:

Sublevel caving method without sill pillar is gradually applied to mining of inclined medium-thick ore bodies，for it has the advantages of simple craft，safety，high efficiency，high mechanization and low mining cost.Nevertheless，its high ore loss and high dilution in the mining of the inclined medium-thick orebody are still ubiquitous，so the inserts drawing technology was proposed.The basic principle of this technology is to insert steel pipes at the contact point of drift to form a diversion isolation plate （inserts） to change the flow path of the ore and the rock，and also to improve the conditions of drawing.By adopting inserts drawing technology，12 sets of physical simulation experiments of inserts drawing were carried out to analyze the influence of different sizes of drawing point on the ore loss and dilution of inserts drawing technology.The experimental results show that when the following drawing indexes are determined，such as the orebody inclination，orebody thickness，sublevel height and ore caving interval，and the inserts drawing technology is adopted，with the same height of the drawing point，the ore recovery rate increases with the augment of the width of the drawing point accordingly，and the dilution rate does not change significantly with the increase of the width of the drawing point.With the same width of the drawing point，the ore recovery decreases as the height of the drawing point increases，while the dilution rate increases with the increase of the height of the drawing point.Under the condition of the same dilution rate，compared with the conventional drawing，the recovery rate of inserts drawing is increased by 28.33%.In the process of drawing，the width of drawing point is increased，and the inserts structure can effectively change the original flow path of the waste rock，delay the flow rate of the waste rock，and prevent the waste rock from being prematurely depleted.The drawing scheme with a height of 3 m and a width of 6 m has the best drawing effect，and the ore recovery rate is 73.61%.

Key words: sublevel caving method without sill pillar, inclined medium-thick orebody, inserts, sizes of drawing point, ore loss, ore dilution

CLC Number: 

  • TD853.3

Fig.1

Effect of inserts in hopper"

Fig.2

Schematic diagram of inserts drawing principle"

Fig.3

Schematic diagram of model structure"

Table 1

Experimental schemes of inserts drawing"

试验方案放矿口宽度/m放矿口高度/m试验方案放矿口宽度/m放矿口高度/m
133753
234854
335955
4431063
5441164
6451265

Table 2

Granularity gradation of ore and waste rock"

采场级配/mm室内级配/mm矿石质量百分比/%废石质量百分比/%
0~1000~25.01.0
100~2002~420.01.0
200~3004~660.07.0
300~4006~84.550.5
400~5008~1010.540.5

Fig.4

Experimental ore loading model"

Fig.5

Process of inserts drawing"

Table 3

Statistics of physical test data in inserts drawing"

方案放矿口宽度/m放矿口高度/m矿岩放出量/g矿石放出量/g废石放出量/g矿石回收率/%废石混入率/%
13316 3609 0477 31353.2044.70
23418 1188 3499 76950.5753.92
33517 3106 85410 45642.5460.40
44319 21510 3318 88461.9346.24
54419 6308 76910 86155.1255.33
64518 5047 27611 22847.5560.68
75321 01311 0779 93668.1847.29
85420 6299 14111 48859.7555.69
95521 7508 05313 69755.2462.98
106322 21711 57410 64373.6147.91
116421 4839 54111 94264.2455.59
126522 3488 20114 14758.8963.30

Fig .6

Ore recovery rate corresponding to different sizes of ore drawing port"

Fig.7

Relationship curves between cumulative ore discharge and waste rock mixing rate under different width of ore drawing port"

Fig.8

Relationship curves between cumulative ore discharge and waste rock mixing rate under different height of ore drawing port"

Brunton I D，Fraser S J，Hodgkinson J H，al et，2010.Parameters influencing full scale sublevel caving material recovery at the Ridgeway gold mine［J］.International Journal of Rock Mechanics & Mining Sciences，47（4）：647-656.
Cao Jianli，Ren Fengyu，Zhang Jinjun，al et，2011.Experimental study on diversion drawing by stress-relieve sublevel caving method［J］.Journal of Northeastern University（Natural Science），32（8）：1186-1189.
Castro R，Trueman R，Halim A，2007. A study of isolated draw zones in block caving mines by means of a large 3D physical model［J］.International Journal of Rock Mechanics & Mining Sciences，44（6）：860-870.
Chen Yanxin，Xu Delong，Xiao Guoxian，2000.Analysis of powder flow phenomenon in hopper and effect of inserts［J］.China Powder Science and Technology，6（Supp.1）：174-176.
Ding Hangxing，Ren Fengyu，Cao Jianli，al et，2011.Application of diversion drawing technology in Chambishi copper mine［J］.China Mining Magazine，20（4）：55-57.
He Rongxing，Ren Fengyu，Song Delin，al et，2017. Induced caving rule of inclined thick ore body in Hemushan iron mine［J］.Journal of Mining & Safety Engineering，34（5）：899-904.
Huang Gun，Ding Honggang，Tang Xiaolong，al et，2017.Optimization of production drift width in the sub-level caving method［J］.Journal of Chongqing University，40（11）：28-36.
Jin Aibing，Sun Hao，Meng Xinqiu，al et，2017.Study of best caving steps under different ore methods of sublevel caving［J］.Journal of Central South University（Science and Technology），48（11）：3037-3043.
Li Jinwei，2018.Optimization study on mining process of sublevel caving method for gently inclined broken medium thick orebody［J］.Industrial Minerals & Processing，47（8）：56-58.
Li Shenghui，Qin Libin，Sun Guanghua，2009.Analysis of stope’s structural parameters causing ore loss & depletion［J］.Mining Engineering，7（2）：20-22.
Qiao Dengpan，Ma Zhengwei，2007a.Study on flow velocity of bulk at drawing opening and its significant influence height［J］.Metal Mine，37（10）：37-41.
Qiao Dengpan，Zhou Zonghong，Ma Zhengwei，2007b.Study on influence mechanics of drawing outlet in sublevel caving［J］.China Mining Magazine，16（11）：59-62.
Ren Fengyu，1993.Influence of draw hole on ore drawing［J］.Nonferrous Metals，45（4）：17-23.
Sun Dong，2020.Study on Effects of Inserts in Hopper on Powder Discharge［D］.Guangzhou：South China University of Technology.
Sun Hao，Jin Aibing，Gao Yongtao，al et，2015.Flow characteristics of caved ore and rock in the multiple draw-point condition［J］.Chinese Journal of Engineering，37（10）：1251-1259.
Tan Baohui，Ren Fengyu，He Rongxing，al et，2018.Application of vertical zone and combination ore-drawing in inclined medium-thick orebody［J］.Journal of Northeastern University（Natural Science），39（1）：133-137.
Tao G Q，Lu M X，Zhang X F，al et，2019.A new diversion drawing technique for controlling ore loss and dilution during longitudinal sublevel caving［J］.International Journal of Rock Mechanics and Mining Sciences，（113）：163-171.
Wang Wenjie，2009.Theory and application of the depressurized mining for inclined medium-thick ore bodies［J］.Metal Mine，39（2）：23-26.
Yu Zhihong，Zhang Zhiqiang，Song Chao，al et，2019.Influence of ore chute sizes on ore drawing effect［J］.Metal Mine，48（8）：27-31.
Zhang Guojian，Cai Meifeng，2003.Study on the form of blasted down block and its impact［J］.China Mining Magazine，12（12）：38-42.
Zhang Tianhang，Zhao Xingdong，Li Huaibin，al et，2019.Continuous dry filling of long room method for steeply inclined and medium thick orebody［J］.Gold Science and Technology，27（5）：704-711.
曹建立，任凤玉，张晋军，等，2011.分段卸压崩落法导流放矿实验研究［J］.东北大学学报（自然科学版），32（8）：1186-1189.
陈延信，徐德龙，肖国先，2000.仓内粉体流动现象与改流体的作用效果分析［J］.中国粉体技术，6（增1）：174-176.
丁航行，任凤玉，曹建立，等，2011.导流放矿技术在谦比希铜矿的应用［J］.中国矿业，20（4）：55-57.
何荣兴，任凤玉，宋德林，等，2017.和睦山铁矿倾斜厚矿体诱导冒落规律研究［J］.采矿与安全工程学报，34（5）：899-904.
黄滚，丁红岗，唐小龙，等，2017.无底柱分段崩落法进路宽度的优化确定［J］.重庆大学学报，40（11）：28-36.
金爱兵，孙浩，孟新秋，等，2017.无底柱分段崩落法不同放矿方式下崩矿步距研究［J］.中南大学学报（自然科学版），48（11）：3037-3043.
李金位，2018.缓倾斜破碎中厚矿体无底柱分段崩落法采切工艺优化研究［J］.化工矿物与加工，47（8）：56-58.
李胜辉，秦利斌，孙光华，2009.采场结构参数对矿石损失贫化的影响分析［J］.矿业工程，7（2）：20-22.
乔登攀，马正位，2007a.放矿口散体流动速度分布及显著影响高度研究［J］.金属矿山，37（10）：37-41.
乔登攀，周宗红，马正位，2007b.无底柱分段崩落法端部放矿口的影响机理研究［J］.中国矿业，16（11）：59-62.
任凤玉，1993.放矿口对崩落法放矿的影响［J］.有色金属，45（4）：17-23.
孙栋，2020.料仓改流体对粉体下料影响的研究［D］.广州：华东理工大学.
孙浩，金爱兵，高永涛，等，2015.多放矿口条件下崩落矿岩流动特性［J］.工程科学学报，37（10）：1251-1259.
谭宝会，任凤玉，何荣兴，等，2018.垂直分区与组合放矿在倾斜中厚矿体中的应用［J］.东北大学学报（自然科学版），39（1）：133-137.
王文杰，2009.中厚倾斜矿体卸压开采理论及其应用［J］.金属矿山，39（2）：23-26.
于志宏，张治强，宋超，等，2019.放矿口尺寸对放矿效果的影响［J］.金属矿山，48（8）：27-31.
张国建，蔡美峰，2003.崩落体形态及其影响研究［J］.中国矿业，12（12）：40-44.
张天航，赵兴东，李怀宾，等，2019.急倾斜中厚矿体长矿房连续开采干式充填采矿法［J］.黄金科学技术，27（5）：704-711.
[1] SUN Liangzhu,ZHANG Yangshun,WANG Laijun. The model of management of ore loss and ore dilution of Hexi Gold Mine and it's results'analysis [J]. J4, 2001, 9(1): 30-34.
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