煤泥含量对重介质悬浮液稳定性和流动性的影响

重介质悬浮液的稳定性和流动性是影响重介质旋流器分选效果的两个相互矛盾的因素。为探寻悬浮液性质对重介质旋流器分选效果的影响,通过测量悬浮液密度变化和零时表观黏度,研究了不同煤泥含量对悬浮液稳定性和流动性的影响,并进行了实验室重介质旋流器分选试验。结果表明:重介质悬浮液的煤泥含量是影响悬浮液稳定性和流动性的主要因素。同一悬浮液密度下,煤泥含量越高,悬浮液密度下降越慢,其稳定性越好;不同密度的悬浮液达到稳定所需的煤泥含量不同,悬浮液密度越高,达到稳定所需的煤泥量越少。重介质悬浮液的煤泥含量对其流动性的影响效果与稳定性相反,悬浮液密度越大、煤泥含量越高,则黏度越大、流动性越差。实验室重介质旋流器分选试验表明,在悬浮液密度为1.50 g/cm3的条件下,当煤泥含量为20%时,错配物含量最低,其分选效果最好。     

镇城底矿选煤厂重介选煤工艺的参数测控

在重介质旋流器选煤过程中,需要不断地对选煤工艺参数进行检测和调整,以保证产品质量和数量的稳定,并保证生产过程的安全进行.重介质悬浮液的密度和流变特性的检测及调整是重介质选煤工艺参数测控的重点,其液位、压力、煤泥含量等也是影响因素.     

中能煤矿选煤厂重介悬浮液特性的调控改进

针对井下原煤煤质及粒度组成变化对重介工序造成的不适应性,论述了重介悬浮液特性调控原理,相应进行了密度控制系统煤泥参数调控技改,以增加悬浮液系统中的煤泥含量及细粒级煤泥,调整了悬浮液系统的稳定性、流变性和黏度合理性,保证了精煤产品质量的合格与稳定,提高了精煤回收率,拓宽了利润空间,提升了经济效益。     

基于强化学习的重介质选煤过程优化控制

决定重介质选煤产品质量的主要影响因素是重介质悬浮液密度。但是由于过程复杂,设备众多,呈强非线性特性,导致对实现重介质悬浮液密度的优化控制存在难点。为此,针对重介质选煤过程及其特性,提出了一种基于强化学习的优化控制方法,用于在线更新密度设定值。所提方法将策略提升和策略评价两步迭代采用不同的神经网络实现,建立了无模型的控制器。最后,在MATLAB仿真平台上,将该方法与传统PI控制方法相比较,验证了所提方法的有效性。     

基于模糊PID自适应算法的重介质洗选煤控制系统研究

在重介分选过程中,重介质悬浮液的密度控制效果直接决定重介分选的产品质量。本文针对重介质洗选煤过程中使用介质悬浮液密度和介质桶液位变化存在的时变、非线性等特征,采用模糊PID自适应算法,建立了重介质洗选煤过程控制模型。该模型由模态识别器和模糊PID自适应控制器组成,协同对主选分流执行阀、加介分流执行阀和清水阀进行调节,以实现对介质悬浮液密度和介质桶液位的控制,并进行工业运行试验。结果表明:采用模糊PID自适应算法的重介质洗选煤控制系统,对介质悬浮液密度和介质桶液位控制相对于常规PID控制调节,具有精度较高、响应速度快等优点,满足洗选煤过程控制要求。     

高含量重密度组分煤重介质旋流器分选特性研究

为了提高重介质旋流器对高含量重密度组分难选原煤的分选效率，设计了新型重介质旋流器模型装置，建立了颗粒在离心旋转流场中沉降分离数学模型，采用试验与理论分析相结合的方法研究新型重介质旋流器的分选特性，揭示高含量重密度组分难选煤分选特性随工艺参数的变化规律，探索影响新型重介质旋流器流场工作悬浮液动态稳定性的因素及重产物排料输运机制。研究结果表明，新型重介质旋流器分选高含量重密度组分煤时，底流重产物排料能力强、处理量大；离心旋流场中的悬浮液密度梯度分布小、密度相对均匀，底流与溢流密度差值较低，流场中悬浮液稳定性更强；入料的压力与悬浮液动态稳定性、分选精度及重产物排料效率直接相关，随着入料的压力增大，底流、溢流口排出悬浮液密度差值增大，可能偏差E值降低，分选精度提高，重产物排出量升高；当入料的压力为25 kPa时，实际分选密度为1.666 g/cm³,可能偏差E值为0.09 g/cm³,重产物产率为75.23%。本研究为高含量重密度组分煤的分选提供了新的思路。     

安太堡选煤厂重介悬浮液密度及液位检测与自动控制系统应用实践

详细阐述了平朔安太堡选煤厂重介悬浮液密度及液位检测与自动控制系统各功能的实现方法,并介绍了该系统在安太堡矿选煤厂实际应用效果。生产实践表明,该系统实现了重介悬浮液密度、桶位自动检测与分流串料、加介、加水的自动控制,从而保证了整个重介系统运行稳定、可靠,分选效果良好。     

重介悬浮液自动分流与控制的实践应用

在选煤厂的重介生产系统中,重介悬浮液密度的稳定性将直接影响三产品重介旋流器的分选效果。在太原选煤厂针对重介分流人工操作诸多问题,实施了介质系统的自动监测、控制系统改造,实现介质的在线实时监测与调整,重介悬浮液分流实现自动控制,保证介质系统的稳定性,提高了产品质量,并且有效降低了介耗,年创经济效益近1000万元。     

影响重介质旋流器分选效果的工艺因素分析

简要阐述了影响重介质旋流器分选效果的影响因素,重点介绍了入料压力、悬浮液密度、悬浮液中煤泥含量等工艺参数对旋流器分选效果的影响及运行时的取值范围。     

末煤重介分选自动化生产技术的研究与应用

结合重介选煤生产中存在悬浮液密度经常超出工艺要求、精煤产品质量不合格这一问题,重点介绍了可解决这一问题的悬浮液密度自动测控技术、煤泥含量自动测控技术、旋流器入口压力自动测控技术、介质桶液位自动测控技术、精煤产品灰分自动测量系统,以及末煤重介产品质量在线自动测控系统;最后总结了重介分选自动化生产技术的应用情况及今后的发展前景。     

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     

矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。