邯郸选煤厂中煤深度解离再选技术的研究与探讨

针对中煤产率和灰分偏低的问题,邯郸洗煤厂对炼焦中煤深度解离再选技术进行了研究和探讨,提出了中煤再选技术的方案。生产实践表明,中煤再选技术实现了煤与矿物质的有效分离,最大限度的回收了优质炼焦煤资源,对保护国家稀缺煤种资源具有重要意义。     

炼焦中煤矿物学特性及再选试验研究

为缓解我国炼焦用煤资源短缺问题,提高煤炭利用效率,以淮北选煤厂重介选中煤为研究对象,对炼焦中煤的矿物学特性进行了研究.采用X射线衍射仪(XRD)和扫描电镜(SEM)分别对煤样的物相组成和不同密度级煤样的矿物嵌布特征进行了分析,以确定合理的破碎粒度,并分析了破碎产物的解离程度.结果表明:炼焦中煤中的矿物质以黏土类矿物质为主;扫描电镜对破碎产物解离程度的分析表明,将煤样破碎至-0.5 mm可达到较好的解离效果,通过分步释放浮选试验得到产率22.05％、灰分12.93％的精煤.     

稀缺炼焦中煤深度脱灰技术研究

研究了将氢氟酸脱灰工艺与中煤浮选相结合的方式,探索了氢氟酸在不同的反应条件下对中煤灰成分的脱除效果,寻找中煤脱灰的最佳反应条件,即双柳中煤粒径为3～0 mm、反应温度为60℃、液固比为6∶1、反应时间为1.5 h、氢氟酸浓度为20%时,稀缺炼焦中煤灰分能快速从40%下降到10%,以期实现稀缺炼焦中煤的提质回收利用。同时,通过对中煤和脱灰后的煤样进行对比分析后发现,用氢氟酸处理后的中煤,煤样中的各个灰成分等比例下降,证明氢氟酸与煤中的灰成分反应生成了可溶性物质,达到了炼焦中煤深度脱灰的效果。     

炼焦中煤再选试验研究

为解决我国炼焦用煤资源短缺问题,提高稀缺煤种回收率和利用率,以某炼焦煤选煤厂重介中煤为研究对象,对其进行不同粒度破碎解离试验,TBS分选效果预测和分步释放浮选试验。结果表明:炼焦煤选煤厂根据自身特点选择合适的解离粒度和分选工艺进行中煤再选可以增加精煤产率,提高中煤利用率,具有很高的经济效益和社会效益。     

炼焦中煤再选技术试验研究

为解决我国炼焦用煤短缺问题,扩大炼焦煤资源,以马头选煤厂重介选中煤(粒级50～0mm,灰分36.63%)为研究对象,对其进行了破碎,大锥角旋流器分选以及分步释放试验。采用Leica DM4500P反射显微镜,对中煤与不同密度级产品进行显微组分分析。结果表明:对于嵌布粒度细的马头中煤,采用大锥角旋流器难以得到有效分选;采用分步释放试验可以得到灰分为13.40%,产率为12.85%的精煤。     

炼焦中煤再选工艺现状及效果分析

从炼焦中煤中回收质量合格的精煤产品,是实现我国炼焦煤资源效益利用最大化的一项合理途径.本文结合选煤厂现场工艺改造实际效果及一些试验结果,综述了目前中煤再选的常见工艺和适用条件.研究表明,中煤直接分选工艺适用于煤与伴生矿物较易解离的情况,中煤返回原分选系统即可取得较佳的分选效果.当煤中伴生矿物嵌布较细,可选性为难选或极难...     

炼焦中煤磨矿再选研究现状

对我国炼焦煤资源的储存和利用现状进行了论述,从炼焦中煤中分选出质量合格的精煤,最大效益的利用现有资源的趋势势在必行。从煤质特征,磨矿及其预处理和分选方法等方面介绍了我国炼焦煤分选中煤的磨矿再选研究现状,比较了各分选方法的优缺点。中煤中的矿物质主要为黏土类矿物,多以粒度为5~-30μm的颗粒散布在有机组分中。适宜的磨矿预处理不仅促进中煤中矿物质和有机组分之间的解离,而且有利于降低精煤灰分。在精煤产率相对较低的前提下,粗磨矿具有磨矿能耗低、药剂消耗低、有效避免过破磨、工艺简单等优点;虽然深度磨矿精煤回收率高,但其往往带来巨大的能耗、药耗以及其他缺点。综合考虑各因素,认为预处理-粗磨-粗精选是回收炼焦中煤有效可行的途径之一。     

干法棒磨与球磨对炼焦中煤解离特性及磨矿产物浮选影响

为探究干法棒磨与球磨对炼焦中煤解离特性与磨矿产物浮选回收效果的影响,采用筛分、浮沉、分步释放浮选试验,探究了干法棒磨与球磨条件下炼焦中煤的解离特性与磨矿产物的浮选行为,应用接触角测量仪、红外光谱仪以及X射线光电子能谱仪,研究了2种磨矿方式解离获得的煤表面性质。结果表明:与球磨相比,棒磨对炼焦中煤解离的选择性较好且磨矿产物过粉碎程度显著降低;棒磨产物的浮选指标明显优于球磨产物,主要原因是棒磨产物中煤与矿物质解离程度更高,且其粒度组成更有利于浮选回收; 2种磨矿方式解离释放的煤表面性质基本相同。     

破碎方式和粒度对低阶煤在炼焦配煤中的影响研究

我国优质炼焦煤资源日益短缺,是未来制约焦化行业发展的主要因素。为了节约优质炼焦煤资源、降低企业成本,扩大炼焦煤种是可行且有效的方法之一。文章选取了一种低阶煤进行配煤炼焦,通过对破碎方式、破碎粒度的改变,分析其应用于顶装和捣固两种不同炼焦工艺的配煤炼焦中对焦炭质量的影响。     

中煤破碎再选的应用研究

 针对炼焦中煤的不合理利用,引出了中煤破碎再选的思路,分析了中煤再选的现状,并结合现场的中煤情况,提出了中煤破碎—TBS再选的工艺,发现其经济效益显著,为中煤的回收利用提供借鉴和参考。     

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。