优化大山选矿厂磨矿产品粒度特性和细度的研究与实践

近年来，由于矿石性质的变化，以及球磨机钢球级配不合理和旋流器分级效率不高等原因，导致德兴铜矿大山选矿厂磨矿产品细度达不到设计要求的-0.074 mm占65%的工艺要求。为提高磨矿产品细度，进行了试验研究。结果表明，现场的7.32 m×10.68 m溢流型球磨机适宜的最大钢球球径为60 mm，在直径分别为60 mm、50 mm、40 mm和30 mm的初装球质量配合比为30∶25∶30∶15情况下，模拟现场进行磨矿，磨矿产品-0.074 mm产率、中间易选级别0.20～0.010 mm和0.15～0.038 mm粒级的产率均比现场高2～5个百分点，磨矿效果较好；工业试验期间，磨矿产品粒度特性得到改善，分级效率有所提高，旋流器溢流-0.074 mm含量提高了6.06个百分点、粗粒级含量有所下降、适合选别的中间粒级含量有所提高。     

钢球级配对钒钛磁铁矿磨矿产品粒度分布的影响

按照攀西地区某选矿厂生产要求,结合钒钛磁铁矿原矿单轴抗压强度及球径半理论公式,确定了磨机推荐的初装球方案(质量比),并与现厂初装球方案进行对比。试验结果表明:各阶段磨机最佳的初装球方案为一段磨矿?90 mm、?80 mm、?60 mm、?40 mm之比为25∶25∶20∶30(钢球),二段磨矿?50 mm、?40 mm、?30 mm之比为15∶35∶50(钢球),三段磨矿35 mm×40 mm、30 mm×35 mm、25 mm×30 mm之比为20∶30∶50(钢段);钢球直径和配比经过优化后,磨机磨矿产品粒度分布趋于合理,一段磨机过粗粒级产率降低了3.96个百分点,可选级别粒级产率提高了4.00个百分点;二段磨机过粗粒级产率降低了3.65个百分点,可选级别粒级产率提高了20.16个百分点;三段磨机过粗粒级产率降低了6.43个百分点,可选级别粒级产率提高了6.74个百分点,有效提高了钒钛磁铁矿的磨矿效率。     

优化介质制度提高中矿再磨作业质量的试验研究

为了改善安徽某铜矿选厂中矿再磨Φ4.0 m×6.7 m磨机磨矿产品粒度组成,本文分别采用钢球和钢锻作为磨矿介质对中矿再磨磨矿效果进行对比试验,最终选用钢锻作为选厂中矿再磨Φ4.0 m×6.7 m磨机的磨矿介质,其初装尺寸组成为:35×40:25×30:20×25=20:40:40。试验结果表明:推荐的钢锻方案较现场方案,磨矿产品粒度均匀性明显得到提高,-0.038 mm产率提高了2.26%,中间易选级别-0.038+0.010 mm产率提高了3.25%,而且,该推荐方案较推荐钢球配比,-0.010 mm产率减少了2.27%,中间易选级别-0.038+0.010 mm产率提高了1.03%,为提高铜的浮选回收率创造了有利条件,同时对提高中矿再磨作业质量具有一定的指导意义。     

优化介质制度提高磨矿产品粒度均匀性

用精确化装补球方法来优化洛钼集团选矿二公司万吨车间磨矿产品的粒度组成,推荐采用磨矿介质尺寸配比为?100∶?80∶?60∶?40=20∶30∶20∶30。试验结果表明:采用推荐方案进行磨矿试验时,与现场方案相比,+0.20 mm产率降低了9.8个百分点;-0.074 mm产率提高了10.65个百分点;中间可选级别0.20~0.010 mm产率提高了9.13个百分点;中间易选级别0.10~0.019 mm产率提高了8.32个百分点,全面优化了磨矿产品的粒度均匀性。     

武山铜矿磨矿介质与矿石力学性质匹配性研究

本文介绍了一种通过研究武山铜矿矿石力学性质确定匹配的磨机球径与球比,有效优化磨矿产品粒度特性的方法。在武山铜矿矿石普氏硬度系数均值为7.8,泊松比均值为0.224的条件下,进行推荐方案Φ100:Φ70:Φ50:Φ30=15:25:30:30和现场介质配比方案Φ100:Φ80:Φ60:Φ40=30:40:20:10的对比磨矿试验。试验结果表明,推荐方案粗级别( 0.20 mm)产率比现厂方案降低5.76%,磨矿细度(-0.074 mm)、易选级别(0.15～0.019 mm)和可选级别产率(0.20～0.010 mm)产率分别提高了11.17、7.63、3.52个百分点,达到了优化磨矿产品粒度特性的效果。      

云南某铅锌矿二段磨矿参数优化对比试验研究

针对云南某铅锌矿二段球磨机磨矿产品粒度不均匀等问题,分别进行不同磨矿介质配比、充填率、磨矿浓度试验。通过测定矿石力学性质和二段球磨机给矿粒度组成,利用球径半理论公式计算出推荐钢球方案m(φ40): m(φ30): m(φ20)=20:45:35,按照质量相等原则,得到相应钢段配比D×L 35×40:25×30:20×25=20:45:35。对比试验结果表明：推荐钢段方案中间易选级别(-0.074+0.01 mm)含量最高为76 %,过粉碎(-0.01 mm)含量最低为12.18 %；充填率达到24 %,与现场充填率对比,中间易选级别(-0.074+0.01 mm)产率提高2.1个百分点,粗级别(+0.1 mm)减少了0.21个百分点,过粉碎级别(-0.01 mm)含量仅增加1.33个百分点；磨矿浓度70 %时,中间易选级别(-0.074+0.01 mm)与过粉碎级别(-0.01 mm)含量提高1.56与1.6个百分点,粗级别(+0.1 mm)含量降低0.36个百分点。因此,推荐钢段方案D×L 35×40:25×30:20×25=20:45:35、充填率24 %、磨矿浓度70 %可有效提高磨矿工艺指标。     

提高峨口铁矿磨矿工艺指标的对比试验研究

针对峨口铁矿一段磨矿产品粒度组成分布均匀性差以及磨矿工艺指标低的问题,结合峨口铁矿矿石力学性质和一段磨矿磨机给矿粒度组成分布,经计算,推荐介质配比方案为m(Φ100):m(Φ80):m(Φ60):m(Φ40)=30∶35∶15∶20。采用推荐介质配比方案与现厂方案以及偏大、偏小介质方案进行磨矿对比试验,结果表明,推荐介质配比方案磨矿产品中+0.15mm粒级产率较现厂方案低6.79个百分点,-0.074mm粒级产率较现厂方案高4.86个百分点,-0.074mm磨机利用效率较现厂方案分别提高2.63、3.99个百分点,推荐介质配比方案可有效提高磨矿作业工艺指标。     

中关铁矿球磨机磨矿介质尺寸与配比试验

为确定中关铁矿选矿厂球磨机合适的磨矿介质尺寸与配比,采用段氏半理论公式计算出入磨矿石球磨机最佳磨矿介质为φ60 mm钢球和φ40 mm×50 mm、φ25 mm×20 mm钢段,并利用给料粒度相关法和等密度法,通过磨矿介质配比试验确定3种磨矿介质最佳配比为1∶1∶8;磨矿产品细度-0. 074 mm含量66. 66%,相比原矿,-0. 074 mm粒级含量提高54. 13个百分点,且能在一定程度上改善过磨问题。     

铸铁段作为磨矿介质在冬瓜山铜矿的试验研究

以冬瓜山铜矿矿石为研究对象,运用精确化装补球技术,精确的计算出初装球的球径和球比,并根据质量相当的原则,用耐磨铸铁段替换钢球作为磨矿介质,最终确定了50 mm×60 mm∶35 mm×40mm∶30 mm×35 mm=30∶25∶45的球磨机初装比方案,然后通过普通钢球与耐磨铸铁段的对比试验来研究磨矿过程中铸铁段作为磨矿介质的磨矿效果。试验结果表明,在相同的磨矿条件下,铸铁段的中间易选级别比现场方案提高了13.43个百分点,过粉碎比现场方案降低了2.53个百分点,磨矿细度比现场方案提高了7.89个百分点,铸铁段可以取代钢球作为新型磨矿介质。     

提高冬瓜山铜矿粗磨磨矿效率的对比试验研究

针对冬瓜山铜矿粗磨产品细度及均匀性差,磨矿技术效率和磨机利用系数低的问题,以钢球、钢段、钢球+钢段(简称球段)介质方案进行磨矿对比试验。实验室结果表明:推荐的介质制度与现场介质制度相比,过粗粒级含量γ+0.15mm低0.75个百分点,小于0.074 mm粒级含量γ-0.074mm高6.74%,磨矿技术效率及磨机-200目和-100目利用系数分别提高2.17%、10.19%和1.84%;钢段方案及球段方案磨矿产品粒度均匀性较差,不适用于粗磨。因此,推荐冬瓜山铜矿粗磨采用Ф60:Ф40:Ф30:Ф25=25:15:25:35钢球介质配比方案,可有效提高粗磨磨矿效率。     

China rare earth market review

正November 1~10,2014Chinese rare earth market was still inactive.Demand for rare earth products was weak.Consumers took a wait-and-see attitude for lower price.As it was an off season for rare earth products,it was expected that prices of rare earth could continue turbulence at the bottom in short terms.Due to a sharp drop,demand for rare earth from downstream recovered.Affected by new energy vehicles,wind powder and energy-efficient appliances,production of rare earth permanent     

China rare earth market review

正August 1~10,2014 There was some good news in rare earth industry recently.Restructuring plans of rare earth groups led by Baotou IronSteel Group and Xiamen Tungsten Group respectively have been approved by MIIT.And rare earth storage policy,which had been expected for a very long time,has been launched officially.Pushed by the good news,rare earth price started to rebound since August 5.Price of didymium oxide and dysprosium oxide rose about 1% to 2%,averagely.About 10% of     

China rare earth market review

正July 1~10,2014Due to weak demand from downstream industry and slow transactions,rare earth market remained weak and price of rare earth products continued to decline.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,     

New energy vehicle:an opportunity for rare earth magnets

<正>Extracted from Securities Guide 1.Popularity of new energy vehicles—an irresistible market trend1.1 Progress of new energy vehicles Chinese Premier Li Keqiang said recently on a visit to Xi'an BYD Autos that new energy vehicles,especially new energy bus,can lessen environment and noise pollution.He encouraged the use of new     

注浆加固技术在十三矿-685 m进风大巷中的应用

针对煤矿开采深度不断向深部延伸,掘进巷道受深部高应力的影响越来越大,巷道围岩整体稳定性差,矿山压力显现越剧烈现象,一般锚网喷加锚索支护无法从根本上控制巷道的变形。总结了平煤股份十三矿-685 m进风大巷注浆加固技术,依据对巷道掘进之后变形监测数据的采集,对巷道变形机理进行分析研究,并对注浆时段进行了合理选择,在对巷道的注浆工艺进行了充分论证的基础上,对巷道进行了注浆。注浆后效果表明:巷道滞后注浆时间段的选择非常重要,巷道在恰当的时间内进行注浆加固施工,能有效控制巷道的变形,巷道注浆后变形量明显减小,岩体的稳定性明显增强,减少了巷道日常维修工作,降低了矿井的生产成本,保障了矿井的安全生产。     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel