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《现代矿业》2016,(2)
柏泉铁矿石铁品位为12.17%,P2O5含量为2.38%,金属矿物主要为磁铁矿、赤铁矿等,非金属矿物有磷灰石、斜长石等。选厂原采用球磨机通过阶段磨矿—阶段选铁、磁选尾矿1粗3精1扫浮选磷工艺流程处理该矿石,但磷品位及回收率明显偏低。分别采用球磨机和棒磨机对该矿石破碎产品进行磨矿—磁选选铁和磁选尾矿1粗1扫浮选回收磷试验。结果表明,相比球磨机,磨矿产品达到相同磨矿细度时棒磨机所需磨矿时间更短;球磨机和棒磨机产品磨矿细度-0.074 mm分别占35%、40%时,选铁指标各自达到最佳,且棒磨-磁选精矿比球磨-磁选铁精矿铁品位增加4.66个百分点,铁回收率减少1.66个百分点;球磨机和棒磨机产品磨矿细度均为-0.074 mm 35%时,浮选回收磷效果最好,尽管棒磨产品最终浮选磷精矿P2O5品位降低1.49个百分点,但P2O5作业回收率增加15.91个百分点。该试验结果可为该矿山选厂磨矿工艺的改进提供借鉴。 相似文献
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哈萨克斯坦微细粒嵌布赤铁矿选矿工艺研究 总被引:2,自引:2,他引:2
对平均嵌布粒度仅15μm的哈萨克斯坦巴尔布拉乌赤铁矿进行选矿工艺研究,最终开发出强磁-反浮选微细粒嵌布赤铁矿选矿工艺。采用强磁预先抛尾,而后再磨,应用高效调整剂CN及捕收剂BK959,经一次粗选、两次扫选、三次精选的反浮选处理,有效实现难选赤铁矿的浮选分离,得到了高品位的赤铁矿精矿,铁精矿品位达到66%以上、回收率达到70%以上。为该矿的工业开发提供了选矿技术支撑。 相似文献
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铁坑褐铁矿选矿工艺研究 总被引:2,自引:1,他引:1
通过铁坑褐铁矿磨矿细度、强磁选、浮选、浮选中间产品选矿的试验,磨矿-强磁-再磨反浮选流程试验,磨矿-强磁-再磨强磁-反浮选流程试验和扩大连续选矿试验,制定了铁坑褐铁矿选矿的合理工艺流程,并确定磨矿-强磁选-再磨强磁选-反浮选工艺为选厂工业设计推荐流程,较好地解决了褐铁矿选矿工艺问题。 相似文献
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对某低品位难选氧化铁矿进行了阶段磨矿-弱磁-强磁-阴离子反浮选试验研究。首先在磨矿粒度-0.074 mm粒级占65%的条件下通过预先作业抛尾, 因矿石中有用矿物嵌布不均匀, 粒度较细, 选择对粗精矿进行再磨。再磨后的强磁精矿单独反浮选得到浮选精矿与再磨弱磁精矿混合得到最终铁精矿。全流程试验获得了铁品位为61.53%、铁回收率为63.31%的混合铁精矿。 相似文献
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介绍了近十年金岭铁矿球磨机衬板在一段磨机上的的使用情况,通过对比分析,总结出磨机衬板的理想组合,从而达到节能、增效的目的。 相似文献
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J. Kolacz 《Minerals Engineering》1997,10(12):1329-1338
Investigation of a dry fine grinding circuit has shown significant influence of the mill load (powder filling) on the production capacity. To improve the circuit performance at industrial scale, alternative ways of mill load measurement were investigated. Detection of strain changes in the mill shell during mill rotation, by using a piezoelectric strain transducer, provided very interesting results, allowing evaluation of the weight of the mill charge and control of the powder filling to obtain an optimal level. Power draw has thus been increased by about 5% compared to the old configuration where mill motor power input was used to control the mill charge. By measuring mechanical vibration with the transducer, additional useful information has been obtained about the behavior of the cataracting and cascading balls inside the mill shell. Finally an important factor was simplicity and low investment cost of the total installation, as many fine grinding mills operate in relatively small circuits that do not warrant large investment for alternative measurement methods. 相似文献
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Real-time measurement of the mill load is the key to improve the production capacity and energy efficiency for the grinding process. In this paper, experimental analysis of the wet mill load based on the vibration signals of the laboratory-scale ball mill shell is presented. A series of experiments are conducted to investigate the vibration characteristics corresponding to different grinding conditions such as dry grinding, wet grinding and water grinding. The power spectral density of the vibration signals is systematically interpreted.Experimental results show that the rheological properties of the pulp affect the amplitude and frequency of the vibration signal. The most important conclusion is that the frequency range of the shell vibration of the laboratory wet mill can be divided into three parts, namely natural frequency band, main impact frequency band and secondary impact frequency band. Finally, soft-sensor models between vibration signal and mill operating parameters of mill load are established using genetic algorithm-partial least square (GA-PLS) technology. After more work on industry scale ball mill is done, the soft-sensor modeling based on the mill shell vibration for operating parameters of mill load will improve the performance of the ball mill in the grinding process. 相似文献
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为了澄清业界对立式辊磨机粉磨水泥熟料的种种认识误区,对立式辊磨试验机和标准邦德功指数试验机粉磨水泥熟料产品进行了电镜分析。分析结果表明,采用不同粉磨设备,其产品颗粒形状差别很小,且粒度分布区间和粒度分布趋势均基本吻合,得出立式辊磨机完全可以替代球磨机的结论。 相似文献
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针对辽宁万华集团大庙铁矿极贫矿石,入磨粒度粗,处理量小的情况,从破碎设备和工艺分析存在的原因,应用柱磨机来实现“多碎少磨”,并对改造前后作出具体综合分析,为一些新建的低品位矿山和老矿山的技术改造作一个参考。 相似文献
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为探究球磨机介质分层机理对球磨效率的影响规律,本文采用介质循
环中心和质量中心解析不同填充率、转速率、长径比下介质群颗粒径向和轴向分
层行为。研究结果表明:径向研究中,填充率越大,介质群循环中心越靠近筒体
中心,转速率增大,介质循环中心逐渐向筒体左下方偏移。对颗粒轴向研究中,
不同的填充率、转速率、长径比下,对颗粒分层均有不同程度的影响。未达到分
层前,颗粒介质随时间的变化而变化,颗粒介质群大体呈现统一单调性;达到分
层状态后,颗粒介质群的质量中心会有明显的变化,折线的增减趋势呈现出明显
的变化。转速率越大,介质群质量中心值越大。长径比越大,介质群质量中心值
越大。 相似文献