粉煤灰的环境特性

论述了粉煤灰中有害物质及其对环境产生危害的途径和粉煤灰危害性的特点，分析了粉煤灰的淋溶性、粉煤灰微量元素农作物吸收性和粉煤灰的放射性，认为粉煤灰总体上对环境不会产生严重危害，但粉煤灰存在环境危害性也是不争的事实．总结了当前粉煤灰环境特性研究状况，指出了研究过程中存在的主要问题，认为将粉煤灰利用研究与粉煤灰环境特性研究结合起来是粉煤灰综合利用的必由之路和发展方向．     

矿井粉煤灰基防灭火技术研究进展

煤炭是我国的主体能源，是国家电力供应安全稳定和经济社会发展的重要保障，但煤炭燃烧发电过程会产生大量的粉煤灰固体废弃物，长期堆放会严重污染土壤、水源、大气等生态环境，但粉煤灰也可作为原材料应用于矿井煤自燃灾害的防治。然而，现阶段粉煤灰在矿井防灭火领域的应用存在少量分散利用、技术含量和附加值较低等不足，当前对于粉煤灰的无害化预处理及防灭火利用规模仍无法满足国家“双碳”目标下对固废资源化利用与绿色矿山建设的相关要求。为进一步推动粉煤灰在矿井煤自燃防治领域的高效、高值及规模化利用，实现以粉煤灰为原料的防灭火材料及技术的快速发展，较全面地总结了粉煤灰浆液、粉煤灰凝胶、粉煤灰泡沫等防灭火技术的原理、分类、最新发展及应用效果；从粉煤灰预处理前端、浆液管路运输中端、防灭火利用末端等方面为出发点，凝练了粉煤灰固废物中有害物质和有价组分的分离、高浓度粉煤灰浆液长距离输送时的沉淀堵管、粉煤灰基防灭火材料在采空区的渗流堆积规律等3个亟待解决的关键问题。为提高粉煤灰固废物对矿井煤自燃的防治效果，满足“双碳”目标下国家对绿色矿山及智能化矿井建设的要求，提出粉煤灰固废在防灭火技术领域“长效防火—协同固碳—智能调控”...     

CFB锅炉粉煤灰摩擦荷电特性及分选脱炭研究

脱炭是粉煤灰综合利用的前提，摩擦电选是粉煤灰脱炭的有效方式。为了探索粉煤灰摩擦荷电特性和分选脱炭的最佳操作条件，以CFB锅炉粉煤灰为研究对象，基于其物理化学、工艺矿物学特性分析，采用不锈钢、铜、铝和PVC四种材质，通过摩擦荷电试验，对焦炭和粉煤灰主要成分(SiO₂,CaO,CaSO₄)进行了摩擦荷电特性研究；通过摩擦电选试验，探究了给料速度、风量、分选电压对粉煤灰摩擦电选脱炭效果的影响；并采用Box-Behnken响应曲面法，对粉煤灰摩擦电选的操作参数进行了优化。试验结果表明：PVC的摩擦荷电效果较好，能使焦炭与粉煤灰主要成分的摩擦荷电量差异较大，可作为摩擦荷电器的摩擦材料；粉煤灰烧失量随给料速度的增加呈先降低后增加的趋势，随着风量的升高呈现逐渐降低的趋势，分选电压提高有利于降低粉煤灰烧失量，三个因素之中以风量对粉煤灰烧失量的影响最为显著；优化得出粉煤灰摩擦电选的最佳操作条件，即风量为70 m³/h、分选电压为20 kV、给料速度为10.8 kg/h,在此条件下，粉煤灰烧失量最低，为8.45%。研究可为粉煤灰摩擦电选脱炭...     

粉煤灰作为土壤改良剂的试验研究

本文阐述了用粉煤灰作为土地复垦、土壤改良剂的试验，初步提出粉煤灰与一定量的农家肥、化肥配制成“复合肥料”，粉煤灰起了重要作用。以废治废，既节约粉煤灰的处理费用，又加快了土地复垦的进程。     

粉煤灰混凝土强度与抗渗性的研究

我国粉煤灰年排放量已超过亿吨，居世界第二。粉煤灰的综合利用符合“保护耕地”，“保护环境”的基本国策。论文利用正交试验的方法，对原状粉煤灰混凝土的抗渗性、强度与时间的关系做了一些研究，并利用极差分析的方法确定了影响粉煤灰混凝土强度与抗渗性各因素的主次顺序，从而找出利用当地粉煤灰配制普通粉煤灰混凝土的最佳配比，以使粉煤灰混凝土的强度、抗渗性、经济性均达到最佳状态。     

论粉煤灰应用商品化

随着经济和废物资源化研究的发展，粉煤灰再利用已成为必然趋势，为粉煤灰商品化奠定了良好基础。开展粉煤灰商品化研究有利于形成粉煤灰加工、开发的良性循环，进而加快粉煤发利用步伐和利用深度，这对保护环境、变废为宝等都具有重大意义。     

粉煤灰的CO2矿化降碱反应特性研究

发展适用于燃煤电厂的CO₂捕集、利用与封存技术对实现我国碳达峰、碳中和的目标具有重要意义。固体废弃物减量化、资源化和无害化利用是当前我国污染环境防治的战略举措。文章以电厂粉煤灰为研究对象，探究该粉煤灰的CO₂矿化特性、降碱及返碱特性、反应前后的理化特性，探讨了反应后粉煤灰的利用途径。研究表明，增大烟气流速能够有效增加CO₂矿化和粉煤灰降碱特性，但烟气流速超过一定值后，CO₂溶解成为限速步骤，钙的转化率达到饱和；粉煤灰-水体系中引入有机胺可显著提升CO₂利用率和粉煤灰的CO₂固定量，这是由于有机胺不仅可以提高溶液中CO₂溶解度，还能强化粉煤灰颗粒中钙基物相的溶解。CO₂矿化不仅可以显著降低粉煤灰碱性，还可降低粉煤灰中某些重金属的浸出量，从而促进粉煤灰的消纳与资源化利用。     

高炭粉煤灰分选研究及其开发意义

介绍了粉煤灰资源状况，分析了粉煤灰理化性质，阐述了高炭粉煤灰的分选原理及工艺流程，并对高炭粉煤灰分选及开发的可行性进行了探讨。     

燃煤发电厂粉煤灰在材料科学中的应用

本文在介绍了粉煤灰的理化性质以及国内外对其综合利用现状的基础上，重点探讨了现今国内外在材料科学领域对粉煤灰利用的热点（粉煤灰混凝土、水泥、Sialon 陶瓷等），并对粉煤灰今后应用的重点作了展望，希望能给国内粉煤灰及材料工作者给予一定帮助。     

粉煤灰作为土壤改良剂的试验研究

本文阐述了用粉煤灰作为土地复垦、土壤改良剂的试验，初步提出粉煤灰与一定量的农家肥、化肥配制成“复合肥料”，粉煤灰起了重要作用。以废治废，既节约粉煤灰的处理费用，又加快了土地复垦的进程。     

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     

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     

2014 second batch of rare earth quota released

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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