江西某铜矿磨矿对比试验及应用研究

doi:10.11872/j.issn.1005-2518.2019.02.278

Abstract

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

CLC Number:

TD953

Yinqi HUANG,Qingfei XIAO,Yunxin GUO,Xudong WANG. Comparison Test and Application Study on Grinding of a Copper Mine in Jiangxi Province[J].Gold Science and Technology, 2019, 27(2): 278-284.

Figures/Tables 9

Table 1

Contrast of ball charge schemes of ball mill"

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

Table 1

Fig .1

Table 2

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	4.85	18.50	9 791.70	529.28	528.88	2.11	3.43	0.068	0.143
	4.86	18.55	9 385.20	505.92		4.54		0.175
	4.88	18.68	10 299.80	551.43		3.65		0.186
7#矿块	4.90	18.86	7 657.50	406.07	393.97	4.11	4.21	0.101	0.109
	4.91	18.96	7 352.60	387.79		4.04		0.099
	4.84	18.86	7 149.40	388.05		4.49		0.127
8#矿块	4.88	18.68	9 185.20	491.76	491.53	3.19	3.31	0.126	0.119
	4.93	19.11	9 080.30	475.04		3.71		0.126
	4.90	18.88	9 588.40	507.78		3.04		0.105
10#矿块	4.87	18.63	14 263.20	756.72	764.39	5.79	5.53	0.226	0.247
	4.90	18.86	13 958.30	740.20		5.79		0.225
	4.89	18.81	14 974.60	796.26		5.02		0.259

Fig. 2

Fig .3

Fig .4

Fig .5

Table 4

Ball consumption statistics during industrial experiment"

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	112 026	44.453	44.454	1.827	10.742	101.476	0.906
8#球磨机	110 145	38.509	48.141	9.626	96.276	96.276	0.874

Table 4

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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-12	5
粗选Mac-12	25	丁基黄药	20

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

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