江西某铜矿大型球磨机介质制度优化试验研究

doi:10.11872/j.issn.1005-2518.2020.03.185

Abstract

Abstract:

In order to improve the problems of unreasonable particle size composition，low processing capacity，low transfer rate and high energy consumption of large-scale ball mill grinding products，achieving the purpose of improving the quality of grinding products and optimizing the beneficiation index of the beneficiation plant in a copper mine in Jiangxi,in this paper，the test is performed according to the following steps.Firstly，the main mechanical properties of the ore were determined，including bulk density，elastic modulus，and Poisson’s ratio.Secondly，a laboratory grinding comparison test was carried out in a D×L=240 mm×300 mm）mill，by comparing the grinding effects of the five grinding schemes of the recommended scheme，the plant scheme，the larger scheme，the smaller scheme，and the steel section scheme，the working media system of the mill media with the best ore matching of the concentrator was finally determined as φ60∶φ50∶φ40∶φ30=30∶25∶30∶15.Summarizing the ore mechanical property test results and laboratory grinding test results，we can conclude that：The ore mechanical property test results show that the average ore bulk density is 2.78 g/cm³，the average hardness is 7.9，the average elastic modulus is 3.11×10⁴ MPa，and Poisson’s ratio with average value of 0.25.The overall properties of the ore are media hardness but high toughness.During the ore grinding process，the number of grinding times per unit time should be strengthened.The results of laboratory grinding show that the recommended scheme has a reduction of 1.21 percentage points in the coarse grade （+0.200 mm） and 0.32 percentage points in the over-comminuted grade（-0.010 mm） and the intermedia easily selectable grade（-0.200+0.010 mm） grain content increased by 2.53 percentage points compared with the current plant scheme；Recommended scheme has a better grinding effect compared with steel section scheme，although the over-comminuted grade（-0.010 mm） grain of recommended scheme is 2.75 percentage points higher，the coarse grade（+0.200 mm） grain grade content，grinding fineness（-0.074 mm） grain grade content and intermediate easily selectable grade（-0.200+0.010 mm） grain grade content have increased respectively，they increased by 4.58 percentage points，1.48 percentage points and 3.25 percentage points.Compared with data before and afterthe industrial test，the monthly processing capacity was increased by 13 242 t，the transfer rate of the mill was increased by 2.18 percentage points and the monthly power consumption was reduced by 173 kW.It shows that optimizing the grinding media system can not only improve the quality of the grinding products to a certain extent，but also have an important promotion significance for energy saving and consumption reduction，significantly improve the company’s core technical level and have reference significance for the same type of mine.

Key words: copper ore, large-scale ball mill, granular composition, media system, grinding products, particle size uniformity, transfer rate

CLC Number:

TD982

Fubo LI, Qingfei XIAO, Yinqi HUANG, Qian ZHANG, Xudong WANG. Experimental Study on Optimizing the Media System of Large-scale Ball Mill in a Copper Mine in Jiangxi Province[J].Gold Science and Technology, 2020, 28(4): 603-609.

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参数	参数值
磨机类型	湿式球磨机
磨机尺寸（直径D×长度L）/mm	240×300
球磨机转速/%	75
磨矿时间/min	18
球荷重量/kg	11.5
球磨机给矿量/kg	2
磨矿浓度/%	70
磨矿介质尺寸和配比	变量

方案编号	方案名称	方案内容	平均球径 /mm
1	现场方案	φ70∶φ60∶φ50∶φ40∶φ30=30∶20∶20∶20∶10	53.0
2	推荐方案	φ60∶φ50∶φ40∶φ30=30∶25∶30∶15	47.0
3	偏大方案	φ70∶φ60∶φ50=25∶35∶40	58.5
4	偏小方案	φ50∶φ40∶φ30=25∶35∶40	38.5
5	钢段方案	（55×60）∶（45×50）∶（35×40）∶（25×30） =30∶25∶30∶15	47.0

评价指标	粒级范围/mm
过粗级别	+0.200
中间易选级别	-0.200+0.010
磨矿细度	-0.074
过粉碎级别	-0.010

矿块编号	天然容重/（g·cm^-3）	单轴抗压强度/MPa	平均强度/MPa	割线弹性模量E50/（×10⁴ MPa）	E50平均值	割线泊松比U50	U50平均值
1#矿块	2.69	79.4	83.8	3.72	3.87	0.27	0.27
		88.2		4.14		0.27
		83.8		3.74		0.28
2#矿块	2.89	69.4	72.1	4.01	4.10	0.14	0.14
		71.3		3.95		0.12
		75.7		4.34		0.15
3#矿块	2.76	64.2	71.4	4.03	4.27	0.32	0.33
		73.2		4.54		0.34
		76.9		4.17		0.33

生产指标	工业试验前	工业试验后
矿石总处理量/t	670 385	710 112
月矿石处理量/t	223 462	236704
运转率/%	93.64	95.82
功率/kW	9 322	9 149

Experimental Study on Optimizing the Media System of Large-scale Ball Mill in a Copper Mine in Jiangxi Province

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