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黄金科学技术 ›› 2019, Vol. 27 ›› Issue (2): 278-284.doi: 10.11872/j.issn.1005-2518.2019.02.278

• 采选技术与矿山管理 • 上一篇    下一篇

江西某铜矿磨矿对比试验及应用研究

黄胤淇(),肖庆飞(),郭运鑫,王旭东   

  1. 昆明理工大学国土资源工程学院,云南 昆明 650093
  • 收稿日期:2018-05-24 修回日期:2018-11-15 出版日期:2019-04-30 发布日期:2019-04-30
  • 通讯作者: 肖庆飞 E-mail:769095929@qq.com;13515877@qq.com
  • 作者简介:黄胤淇(1989-),男,辽宁鞍山人,硕士研究生,从事碎磨理论与工艺方面的研究工作。769095929@qq.com|肖庆飞(1980-),男,安徽安庆人,副教授,从事碎磨理论与工艺方面的研究工作。13515877@qq.com
  • 基金资助:
    国家自然科学基金面上项目“多级配球介质磨矿的能量匹配及机理研究”(编号:51774517)和矿物加工科学与技术国家重点实验室开放研究基金“磨矿介质在磨机中的运动规律研究”(编号:201707)

Comparison Test and Application Study on Grinding of a Copper Mine in Jiangxi Province

Yinqi HUANG(),Qingfei XIAO(),Yunxin GUO,Xudong WANG   

  1. Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China
  • Received:2018-05-24 Revised:2018-11-15 Online:2019-04-30 Published:2019-04-30
  • Contact: Qingfei XIAO E-mail:769095929@qq.com;13515877@qq.com

摘要:

针对江西某选厂铜矿石磨矿产品粒度组成差、铜回收率低及磨矿介质消耗量大的问题,以矿石性质为依据,通过实验室磨矿对比试验提出工业化应用的最佳磨矿介质尺寸及配比方案,从而达到改善磨矿效果的目的。实验室磨矿对比试验得出处理矿石的最优初装球方案为?70∶?50∶?40∶?30=20∶30∶20∶30。工业试验期间,从现场7#和8#球磨机溢流中取得矿样,在实验室进行浮选对比试验。工业试验结果表明:应用推荐的磨矿介质方案后,磨矿产品粒度均匀性得到提高,-0.038 mm和-0.074 mm百分含量分别提高了0.47%和2.13%,+0.2 mm百分含量减少了3.14%,中间易选级别-0.2+0.038 mm百分含量提高了2.68%,铜回收率提高了3.70%,球耗降低了0.032 kg/t,为提高铜的浮选回收率创造了有利条件,同时对提高磨矿作业质量具有一定的指导意义。

关键词: 铜矿, 磨矿产品, 粒度组成, 选矿指标, 磨矿介质, 矿石性质, 磨矿效果, 工业应用

Abstract:

The properties of copper ores in a copper concentrator in Jiangxi Province have changed greatly since August 2016,which resulting in obvious differences in particle size composition of grinding products,large consumption of grinding media and reduction of copper recovery rate in the flotation process.Starting with the size and proportion of grinding media,through the determination of ore properties, comparative grinding tests and industrial application work,the purpose of improving the quality of grinding products and copper sorting indexes and reducing the steel ball consumption can be achieved. The mechanical properties of 16 ore blocks with specifications greater than 200 mm were determined on a press of model DE50A.According to the measurement of rock mechanical properties,the average values of Pushi hardness coefficient f and Poisson’s ratio of the porphyry copper ore in this concentrator are only 5 and 0.155,respectively,belonging to soft and brittle ores.The comparison test of copper ore grinding in the concentrator was carried out in a 450 mm× 450 mm discontinuous ball mill in the laboratory.According to the mechanical properties of the ore and the grinding conditions in the field, the maximum grinding ball diameter was calculated to be 70 mm, and four groups of grinding test schemes were formulated and the grinding test was carried out with the steel ball ratio of each scheme. According to the calculation of grinding medium size and ratio and the laboratory grinding comparison test, the optimal grinding medium size and ratio of 3.2 m× 3.1 m lattice ball mill in concentrator is ?70∶?50∶?40∶?30=20∶30∶20∶30.The grain size uniformity of the grinding products in this scheme is the best, the coarse grade yield including +0.2 mm grain size is the lowest, while the intermediate easy grade,-0.2 +0.038 mm grain size yield is the highest,reaching 66.78%,while the -0.038 mm grain size content is lower. During the industrial test,ore samples were obtained from the overflow of the 7# and 8# mills on site, and flotation comparison tests were carried out in the laboratory XFD-0.5 mini flotation machine.The industrial test results show that the content of -0.038 mm and -0.074 mm in grinding products increased by 0.47%,2.13%,and the content of +0.2 mm decreased by 3.14% after using the recommended medium scheme.The content of -0.2+0.038 mm in the intermediate easy-to-select grade increased by 2.68%,the copper recovery rate increased by 3.70%,and the unit ball consumption decreased by 0.032 kg/t.The aim of improving the grain size composition of grinding products, improving the sorting index of copper and reducing the unit consumption of medium in the copper ore processing operation of the concentrator is achieved,and it has certain guiding significance for improving the quality of grinding operations.

Key words: copper deposit, grinding product, particle size composition, mineral processing index, grinding media, ore property, grinding effect, industry application

中图分类号: 

  • TD953

表1

磨矿试验方案"

方案钢球尺寸及配比
推荐方案?70∶?50∶?40∶?30=20∶30∶20∶30
现场方案?100∶?80∶?60=30∶40∶30
偏大方案?80∶?60∶?40=30∶40∶30
偏小方案?60∶?50∶?40∶?30=20∶30∶20∶30

图1

浮选试验流程图"

表2

浮选试验药剂条件"

浮选药剂用量/(g·t-1浮选药剂用量/(g·t-1
石灰(pH=8.5)1 000扫选Mac-125
粗选Mac-1225丁基黄药20

表3

岩矿力学性质测定结果"

矿块试件直径/cm试件面积/m2极限载荷/kg抗压强度/(kg·cm-2)

平均强度

(kg?cm-2)

割线弹性衡量

E50/(×10-5 kg·cm-2)

E50割线泊松比U50

U50

平均值

6#矿块4.8518.509 791.70529.28528.882.113.430.0680.143
4.8618.559 385.20505.924.540.175
4.8818.6810 299.80551.433.650.186
7#矿块4.9018.867 657.50406.07393.974.114.210.1010.109
4.9118.967 352.60387.794.040.099
4.8418.867 149.40388.054.490.127
8#矿块4.8818.689 185.20491.76491.533.193.310.1260.119
4.9319.119 080.30475.043.710.126
4.9018.889 588.40507.783.040.105
10#矿块4.8718.6314 263.20756.72764.395.795.530.2260.247
4.9018.8613 958.30740.205.790.225
4.8918.8114 974.60796.265.020.259

图2

磨机给矿的正累积粒度半对数曲线"

图3

各方案的磨矿效果综合比较"

图4

工业试验期间抽样磨矿产品粒度组成"

图5

抽样浮选指标"

表4

工业化试验期间球磨机球耗统计"

磨机编号累积处理量/t累积添加? 80/t累积添加? 70/t累积添加? 60/t累积添加? 50/t钢球总量/t钢耗/(kg·t-1
7#球磨机112 02644.45344.4541.82710.742101.4760.906
8#球磨机110 14538.50948.1419.62696.27696.2760.874
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