高压辊磨操作参数对磁铁矿石球磨功指数的影响
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摘要
对弓长岭磁铁矿石进行高压辊磨和颚式破碎,分析不同粉碎工艺对粉碎产品粒度特性的影响,测定不同粉碎方式在不同目标粒度下的Bond球磨功指数,研究颚式破碎和不同的高压辊磨机辊面压力对Bond球磨功指数的影响。研究结果表明:高压辊磨产品比颚式破碎产品细粒级质量分数高,高压辊磨辊面压力4.5 N/mm~2和5.5N/mm~2产品的粒度分布更加均匀;在磨矿细度小于0.074 mm的质量分数为65%,高压辊磨产品在辊面压力为2.5,3.5,4.5,5.5和6.5 N/mm~2下的Bond球磨功指数比颚式破碎产品分别降低11.36%,21.38%,15.62%,22.59%和27.49%,在磨矿细度小于0.074 mm的质量分数为40%,高压辊磨产品在辊面压力为2.5,3.5,4.5,5.5和6.5 N/mm~2下的Bond球磨功指数比颚式破碎产品分别降低18.49%,27.61%,22.69%,30.37%和35.08%,Bond球磨功指数降低幅度分别降低7.13%,6.23%,7.07%,7.87%和7.59%;辊面压力为5.5和6.5 N/mm~2的Bond球磨功指数降低幅度最大,粗磨节能效果更显著。
Magnetite ore from Gongchangling was crushed by high pressure grinding rolls(HPGR) and jaw crusher(JC). The size characteristic of the products crushed by different crushing manners was analyzed, the Bond work indexes of ball mill by different crushing manners of different target particle sizes were measured, and the influence of Bond work indexes of ball mill of the products crushed by HPGR at different roll surface pressure and JC were studied. The results show that the fine fraction content of crushed products by HPGR is more than that produced by jaw crusher, and the particle size distribution of the product crushed by HPGR at the roll surface pressure of 4.5 and 5.5 N/mm~2 is more uniform. When mass fraction of grinding product smaller than 0.074 mm is 65%, Bond work index of ball mill of the products crushed by HPGR at roll surface pressure of 2.5, 3.5, 4.5, 5.5, and 6.5 N/mm~2 decreases, compared with that crushed by JC, respectively by 11.36%, 21.38%, 15.62%, 22.59%, and 27.49%. On the other hand, presence of 40% by weight instead of 65% of grinding product finer than 0.074 mm affected the decreasing value to be about 18.49%, 27.61%, 22.69%, 30.37%, and 35.08%, respectively. Reduction amplitudes of latter are lower than those of former by 7.13%, 6.23%, 7.07%, 7.87% and 7.59%, respectively. The biggest reduction amplitude is the product crushed by HPGR at the roll surface pressure of 5.5 and 6.5 N/mm~2. Furthermore, the energy saving of coarse grinding is significantly higher than that of finer grinding.
Magnetite ore from Gongchangling was crushed by high pressure grinding rolls(HPGR) and jaw crusher(JC). The size characteristic of the products crushed by different crushing manners was analyzed, the Bond work indexes of ball mill by different crushing manners of different target particle sizes were measured, and the influence of Bond work indexes of ball mill of the products crushed by HPGR at different roll surface pressure and JC were studied. The results show that the fine fraction content of crushed products by HPGR is more than that produced by jaw crusher, and the particle size distribution of the product crushed by HPGR at the roll surface pressure of 4.5 and 5.5 N/mm~2 is more uniform. When mass fraction of grinding product smaller than 0.074 mm is 65%, Bond work index of ball mill of the products crushed by HPGR at roll surface pressure of 2.5, 3.5, 4.5, 5.5, and 6.5 N/mm~2 decreases, compared with that crushed by JC, respectively by 11.36%, 21.38%, 15.62%, 22.59%, and 27.49%. On the other hand, presence of 40% by weight instead of 65% of grinding product finer than 0.074 mm affected the decreasing value to be about 18.49%, 27.61%, 22.69%, 30.37%, and 35.08%, respectively. Reduction amplitudes of latter are lower than those of former by 7.13%, 6.23%, 7.07%, 7.87% and 7.59%, respectively. The biggest reduction amplitude is the product crushed by HPGR at the roll surface pressure of 5.5 and 6.5 N/mm~2. Furthermore, the energy saving of coarse grinding is significantly higher than that of finer grinding.
引文
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[19]侯英,印万忠,朱巨建,等.粒度特性参数与粒度分布均匀程度的关系[J].中南大学学报(自然科学版),2015,46(9):3183-3187.HOU Ying,YIN Wanzhong,ZHU Jujian,et al.Relationship between parameters of size characteristic and uniformity of particle size distribution[J].Journal of Central South University(Science and Technology),2015,46(9):3183-3187.
[20]魏德州.固体物料分选学[M].2版.北京:冶金工业出版社,2009:26-29.WEI Dezhou.Separation of solid materials[M].2nd ed.Beijing:Metallurgical Industry Press,2009:26-29.
[2]TORRES M,CASALI A.A novel approach for the modeling of high-pressure grinding rolls[J].Minerals Engineering,2009,22(13):1137-1146.
[3]NAMIK A A,LEVENT E,HAKAN B.High pressure grinding rolls(HPGR)applications in the cement industry[J].Minerals Engineering,2006,19(2):130-139.
[4]SCH?NERT K.A first survey of grinding with highcompression roller mills[J].International Journal of Mineral Processing,1988,22(1):401-412.
[5]STEPANOV Y V,POPOVA N K,SHESTOPEROVA A V,et al.Effectiveness of selective crushing for coking batch[J].Coke and Chemistry,2010,53(7):247-249.
[6]EREMIN A Y,KUKOLEV Y B,GILYAZETDINOV R R,et al.Selective crushing with pneumatic separation at unit 3 in NTMK coal-preparation shop.1.Quality of concentrates[J].Coke and Chemistry,2008,51(7):247-255.
[7]EREMIN A Y,KUKOLEV Y B,GILYAZETDINOV R R,et al.Efficiency of selective crushing with pneumatic separation for the third unit in the OAO NTMK coal-preparation shop 2.Equipment and operating conditions[J].Coke and Chemistry,2008,51(11):434-439.
[8]YUSUPOV T S,KIRILLOVA E A,DENISOV G A.Dressing of quartz-feldspar ores on the basis of selective grinding and mechanical activation[J].Journal of Mining Science,2003,39(2):174-177.
[9]KODALI P,DHAWAN N,DEPCI T,et al.Particle damage and exposure analysis in HPGR crushing of selected copper ores for column leaching[J].Minerals Engineering,2011,24(13):1478-1487.
[10]袁致涛,郭小飞,严洋,等.攀西钒钛磁铁矿高压辊磨的产品特性[J].东北大学学报(自然科学版),2012,33(1):124-127,132.YUAN Zhitao,GUO Xiaofei,YAN Yang,et al.Product characteristics of vanadium-titanium magnetite from Panxi by high pressure grinding roller[J].Journal of Northeastern University(Natural Science),2012,33(1):124-127,132.
[11]MAXTON D,MORLEY C,BEARMAN R.A quantification of the benefits of high pressure rolls crushing in an operating environment[J].Mineral Engineering,2003,16(9):827-838.
[12]谢广元,张明旭,边炳鑫,等.选矿学[M].徐州:中国矿业大学出版社,2011:61.XIE Guangyuan,ZHANG Mingxu,BIAN Bingxin,et al.Mineral processing[M].Xuzhou:China University of Mining and Technology Press,2011:61.
[13]印万忠,侯英,丁亚卓,等.破碎方式对邦铺钼铜矿石可磨性及钼浮选的影响[J].金属矿山,2013(2):86-89.YIN Wanzhong,HOU Ying,DING Yazhuo,et al.Effect of different comminuting process on grindability and molybdenum flotation of Bangpu Mo-Cu ore[J].Metal Mine,2013(2):86-89.
[14]刘磊.贫赤铁矿石高压辊磨机粉碎-高效分选技术研究[D].沈阳:东北大学资源与土木工程学院,2012:45-47.LIU Lei.High efficient separation of lean hematite ore comminuted by high-pressure grinding roller[D].Shenyang:Northeastern University.School of Resources&Civil Engineering,2012:45-47.
[15]侯英,丁亚卓,印万忠,等.矿石高压辊磨产品球磨功指数计算程序的建立[J].中南大学学报(自然科学版),2013,44(11):4385-4391.HOU Ying,DING Yazhuo,YIN Wanzhong,et al.Establishment of computation program of bond work index of ball mill of ore crushed by high pressure grinding rolls[J].Journal of Central South University(Natural Science),2013,44(11):4385-4391.
[16]侯英,丁亚卓,印万忠,等.邦铺钼铜矿石高压辊磨后物料的特性[J].中南大学学报(自然科学版),2013,44(12):4781-4786.HOU Ying,DING Yazhuo,YIN Wanzhong,et al.Product characteristics of Mo-Cu ore from Bangpu by high pressure grinding rolls[J].Journal of Central South University(Natural Science),2013,44(12):4781-4786.
[17]FUERSTENAU D W,KAPUR P C.Comminution of minerals in a laboratory-size,choke fed high-pressure roll mills[C]//Proceedings of the 18th International Mineral Processing Congress.Sydney,1993:175-180.
[18]LIM I L,VOIGT W,WELLER K R.Product size distribution and energy expenditure in grinding minerals and ores in high pressure rolls[J].International Journal of Mineral Processing,1996,44/45:539-559.
[19]侯英,印万忠,朱巨建,等.粒度特性参数与粒度分布均匀程度的关系[J].中南大学学报(自然科学版),2015,46(9):3183-3187.HOU Ying,YIN Wanzhong,ZHU Jujian,et al.Relationship between parameters of size characteristic and uniformity of particle size distribution[J].Journal of Central South University(Science and Technology),2015,46(9):3183-3187.
[20]魏德州.固体物料分选学[M].2版.北京:冶金工业出版社,2009:26-29.WEI Dezhou.Separation of solid materials[M].2nd ed.Beijing:Metallurgical Industry Press,2009:26-29.