弧形溢流管对旋流器分离性能的影响

针对目前运行的旋流器存在短路流导致溢流跑粗的问题,提出了一种弧形溢流管旋流器,并进行了数值模拟和试验研究。模拟结果表明,利用溢流管的弧形结构将溢流口底端的过渡区域外移,实现过渡区域流体切线速度的提升,从而增加离心强度,将短路流引导至外旋流重新参与分离,达到抑制溢流跑粗的效果。试验结果表明,相同排口比下,弧形溢流管旋流器溢流-25 μm粒级含量和综合分级效率均高于直线形溢流管旋流器;试验用弧形溢流管旋流器在排口比为0.33时抑制旋流器溢流跑粗的效果最好,对应的溢流浓度为4.72%,溢流-25 μm粒级含量为98.37%,-25 μm计的综合分级效率为78.92%,高于直线形溢流管旋流器对应情况下的4.25%、96.86%和73.51%。     

弧形溢流管对旋流器分离性能的影响

针对目前运行的旋流器存在短路流导致溢流跑粗的问题，提出了一种弧形溢流管旋流器，并进行了数值模拟和试验研究。模拟结果表明，利用溢流管的弧形结构将溢流口底端的过渡区域外移，实现过渡区域流体切线速度的提升，从而增加离心强度，将短路流引导至外旋流重新参与分离，达到抑制溢流跑粗的效果。试验结果表明，相同排口比下，弧形溢流管旋流器溢流-25 μm粒级含量和综合分级效率均高于直线形溢流管旋流器；试验用弧形溢流管旋流器在排口比为0.33时抑制旋流器溢流跑粗的效果最好，对应的溢流浓度为4.72%，溢流-25 μm粒级含量为98.37%，-25 μm计的综合分级效率为78.92%，高于直线形溢流管旋流器对应情况下的4.25%、96.86%和73.51%。     

旋风充气式和气泡充气式旋流器分离性能研究

针对常规旋流器存在的底流夹细问题,提出了旋风充气式和气泡充气式旋流器,将气体充入旋流器内 后,可使混入外旋流中的细颗粒重新被吹入内旋流进行二次分离,从而达到减少底流夹细的目的。 通过试验对比分 析了两种不同充气方式旋流器和常规旋流器的分离性能。 结果表明,相比于常规旋流器,充气式旋流器能有效减少 底流夹细,常规旋流器底流中-10 μm 颗粒占比 6. 32%,而使用旋风充气式旋流器能降至 5. 32%;使用气泡充气式旋 流器能降至 5. 53%。 充气条件下,对于-20 μm 颗粒的综合分级效率,旋风充气式旋流器可提高 4. 92 个百分点;气泡 充气式旋流器可提高 3. 24 个百分点。 旋风充气式旋流器分离性能优于气泡充气式旋流器,试验结果可以为新型充气 式旋流器的设计提供指导。     

梅山铁矿降磷尾矿再选及脱水技术研究

为减少梅山铁矿降磷系统进入尾矿库的湿尾矿量,对梅山铁矿降磷尾矿进行了水力旋流器再选试验研究,并根据试验结果进行了再选系统技术改造。通过将现有的FX350×6旋流器组更换为FX150-PU-K×16超长锥旋流器组后,在给矿浓度为29%的条件下,采用Φ150 mm超长锥旋流器,在给矿压力为0.25 MPa、沉砂口直径为30 mm时,可获得底流浓度为61.00%、底流产率为85.70%、底流-0.037 4 mm粒级含量为51.55%的指标,大幅降低了湿尾矿量。     

磁铁矿粉粒度对煤泥重介质旋流器分选效果影响的研究

简述了煤泥重介质旋流器的分选机理,探索磁铁矿粉粒度对煤泥重介质旋流器分选效果的影响,试验选用了同种粒度不同含量的磁铁矿粉对煤泥重介质进行了分选试验研究,结果表明,选用粒度为-0.045 mm、含量在90%时的磁铁矿粉能够达到最好的分选效果。     

青海某金矿浮选尾矿浓缩试验研究与生产实践

青海某金矿选矿厂浮选尾矿难以沉降,浓密机溢流跑浑严重,回水无法使用,浮选尾矿远低于下一工序(氰化浸出)对浓度的要求。为此开展了浮选尾矿浓缩试验研究,试验采用了旋流器预浓缩,分析了旋流器沉砂口及给矿压力对浓缩效率的影响,进行了旋流器溢流絮凝剂筛选试验,确定了适合旋流器溢流的5250絮凝剂及用量。在旋流器给矿浓度为23.94%、-74μm含量为79.83%的情况下,尾矿综合固体浓度达到47.76%,解决了选矿厂回水循环利用及浮选尾矿氰化浸出对浓度的要求。     

脱泥-浮选工艺回收极微细粒锡石试验研究

采用旋流器脱泥-浮选工艺, 结合螯合捕收剂CYX-1与活化剂硝酸铅的药剂组合, 对-10 μm粒级含量79.30%的极微细粒锡石样品进行了回收, 最终获得了锡精矿品位11.18%、回收率37.55%(浮锡作业回收率83.57%)的试验指标。     

德兴铜矿优化旋流器参数提升磨矿分级效率试验研究

为适应磨矿分级工艺的要求,开展了Φ838 mm分级旋流器工艺参数优化试验研究。试验结果表明,在沉砂嘴直径146 mm、溢流管直径343 mm、溢流管插入深度490 mm、旋流器工作压力0.50 kg/cm_²时,Φ838 mm分级旋流器分级效果最佳。在此条件下,旋流器的分级产品质量及分级效率均得到明显提升,其中溢流中－0.074 mm粒级含量为67.97%,比对比组旋流器提高了8.05个百分点;分级效率为58.30%,比对比组旋流器提高了6.89个百分点。     

螺旋突台顶盖式小型水力旋流器在高岭土超细分级中的应用

研究了新型螺旋突台顶盖式小型水力旋流器在高岭土超细分级中的应用.结果表明,利用该旋流器可使溢流产品中的-2μm含量提高到92%以上,有害杂质的含量也得到了较好的控制.     

高梯度磁选钽铌细泥的研究

<正> 栗木锡矿四选厂细泥系统钽铌的回收率很低。为了提高钽铌细泥的选矿指标,进行了高梯度磁选的试验研究。1982年8月在瑶岗仙钨矿对φ75旋流器沉砂(-37μ)进行了探索性试验;1983年1月在栗木锡矿继续对φ75旋流器沉砂进行试验,同时对φ500旋流器溢流(-74μ)也进行了探索性试验,都取得了良好的指标。考虑到处理φ500旋流器溢流可以大大     

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     

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.     

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.     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared