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Gold Science and Technology ›› 2023, Vol. 31 ›› Issue (1): 163-170.doi: 10.11872/j.issn.1005-2518.2023.01.112

• Mining Technology and Mine Management • Previous Articles    

Study on Grinding Medium Ratio Optimization of Φ2.4×3.6 m Ball Mill in Yimen Copper Industry

Yingbao YANG1(),Yanxiong FU1,Yingjie PEI2,Qiang ZHOU3(),Qingfei XIAO3,4,5   

  1. 1.Yimen Copper Co. , Ltd. , Yuxi 651100, Yunnan, China
    2.Anqian Mining Co. , Ltd. , Anshan Iron and Steel Group, Anshan 114043, Liaoning, China
    3.Faculty of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
    4.State Key Laboratory of Clean Utilization of Complex Non-Ferrous Metal Resources, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
    5.State Key Laboratory of Mineral Processing Science and Technology, Beijing 102628, China
  • Received:2022-08-28 Revised:2022-11-22 Online:2023-02-28 Published:2023-03-27
  • Contact: Qiang ZHOU E-mail:419134670@qq.com;zq1246051563@163.com

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Abstract:

With the rapid development of China’s society economy，the demand for copper mineral resources in various fields of our country is increasing day by day，and more and more “poor，fine and miscellaneous” copper resources are being mined，which makes the aim of the grinding operation changes to as much as possible to reduce the yield of over-fine grades and over-coarse grades in grinding products，and increase the yield of intermediate grades of grinding products.At present，there are some problems in the grinding operation of Yimen Copper Co.，Ltd.，such as unreasonable ball filling system of Φ2.4×3.6 m ball mill，low fineness of grinding products，low efficiency of classifier and high circulating load.In view of the above problems，based on the mechanical properties such as ore density，uniaxial compressive strength，elastic modulus and Poisson’s ratio，and the particle size distribution of grinding cycle products such as belt feeding，classifier overflow，classifier sand return and ball mill discharge，the calculation formulas for the ball diameter of various ball mill steel balls that are widely used at home and abroad was compared and analyzed.The semi-theoretical formula of Duan’s ball diameter was adopted to calculate the recommended initial loading medium ratio.Finally，the initial loading plan is determined as：Φ80 mm∶Φ60 mm∶Φ50 mm∶Φ40 mm=30%∶25%∶25%∶20%.And four groups of schemes was set up，namely field scheme，recommended scheme，oversized scheme，and undersized scheme， to carry out laboratory grinding comparison test.The grade yield，grinding fineness and grinding technical efficiency were used as evaluation indicators to study the optimization of the size and ratio of steel balls in the mill.After optimization，compared with the on-site scheme，the yield of +0.150 mm over-coarse grades of the recommended scheme is reduced by 2.38 percentage points，the grinding fineness of -0.074 mm is increased by 5.14 percentage points，and the yield of the intermediate grade （-0.150+0.010 mm） is increased by 1.08 percen-tage points.The efficiency of grinding technology increased by 3.39 percentage points.It shows that using the recommended ratio of initially charged steel balls as the grinding medium of Yimen Copper’s Φ2.4×3.6 m ball mill has obvious optimization effect.On the premise of improving the grinding fineness，the intermediate grade yield is increased，and the over-coarse grade is reduced.The production rate can effectively improve the effi-ciency of grinding technology，and achieve the improvement of grinding technical indicators of the dressing plant，which is of great significance to improving the efficiency and reducing consumption of the dressing plant.

Key words: ball mill, medium ratio, grinding products, grinding optimization, intermediate fraction, recom-mended steel ball ratio

CLC Number: 

  • TD921

Table 1

Measurement results of mechanical properties of ores"

现场编号饱和密度/（g·cm-3）单轴抗压强度/MPa平均强度/MPa割线弹性模量E50/（×104 MPa）U50平均值
14.10108.00138.008.470.58
4.11132.00
4.10175.00
24.11117.00128.0011.900.43
4.12141.00
4.10125.00
33.80171.00192.007.540.19
3.81241.00
3.81163.00
43.8085.4098.207.860.31
3.8097.10
3.81112.00

Fig.1

Primary grinding and classification process"

Fig.2

Particle size composition of Yimen Copper’s Φ2.4×3.6 m ball mill grinding products"

Table 2

Calculation results of Φ2.4×3.6 m initial steel ball ratio of ball mill"

级别/mm给矿产率/%扣除-0.15 mm后待磨产率γ待/%各组适宜球径/mm推荐球比/%
合计100.00100.00-100.00
+2.00014.1130.9080.0030.00
-2.000+0.30010.9924.0760.0025.00
-0.300+0.20010.8623.8150.0025.00
-0.200+0.1509.6921.2240.0020.00
-0.15054.35---

Table 3

Steel ball initial installation scheme of ball mill"

方案介质配比平均球径/mm
推荐方案Φ80 mm∶Φ60 mm∶Φ50 mm∶Φ40 mm=30%∶25%∶25%∶20%59.50
现场方案Φ80 mm∶Φ60 mm=60%∶40%72.00
偏大方案Φ90 mm∶Φ70 mm∶Φ50 mm∶Φ40 mm=30%∶25%∶25%∶20%65.00
偏小方案Φ70 mm∶Φ50 mm∶Φ40 mm∶Φ30 mm=30%∶25%∶25%∶20%49.50

Fig.3

Granularity uniformity of mineral products"

Fig.4

Efficiency index of mining technology"

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