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”...     

粉煤灰全尾砂膏体充填试验研究

电厂工业废料粉煤灰具有潜在胶凝活性。针对当前矿山膏体胶结充填成本高、强度低等现状，提出了以部分粉煤灰替代水泥作为胶凝剂。在对粉煤灰物删性能和化学成份测定分析的基础上，依不同的粉煤灰添加量进行了粉煤灰全尾砂胶结充填强度试验，并对粉煤灰在膏体充填料浆中的胶凝机理进行了探讨。结果表明：在质量分数和水泥用量相同的条件下，添加粉煤灰可以大幅度提高后期强度，并且龄期强度随粉煤灰用量的增加而增大。研究结果为提高胶结充填质量、降低充填成本，进一步综合利用人工火山奠定了一定的基础。     

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。     

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。     

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     

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.     

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     

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     

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.