Vibrated fluidized bed air classification of moist raw coal

Vibrated fluidized bed air classification is completely different from traditional screening in principle. It extracts fine coal from moist raw coal by entrainment of an ascending airflow in a vibrated fluidized bed. Pilot tests showed that air classification efficiencies varied from 74. 85% to 93.84% at cut-size 6, 4, 3, 2, 1, and 0. 5 mm when free moisture of coal is in the range of 1.7% to 9. 5%, and ash contents of fine coal products were 2% ～ 3% lowerthan those of the same size fractions in feed, and 4% ～10% lower than those of feeds for most cases because of the density differences between coal and waste, which is beneficial to producing lower ash fine coal from raw coal as fuel of blast furnaces or pulverized coal firing boilers. A commercial unit of 100 t/h has been in smooth operation, and several 300 ～400 t/h units are in plan or construction.     

草分枝杆菌选择性絮凝脱除煤中黄铁矿硫的研究

对疏水性微生物草分枝杆菌(M．phlei)进行培养，并结合红外光谱分析，研究了草分枝杆菌(M．phlei)的生物学特性及对煤的絮凝作用．试验结果表明，草分枝杆菌(M．phlei)可选择性地吸附作用于煤表面，在实现对煤絮凝的同时，能较有效地脱除煤中的黄铁矿硫．     

Preparation of activated carbon with low ash content and high specific surface area from coal in the presence of KOH

An activated carbon with ash content less than ]0% and specific surface area more than 1600 m^2/g was prepared from cool and the effect of K-containing compounds in preparation of cool-based activated carbon was investigated in detail in this paper. KOH was used in co-carbonization with coal, changes in graphitic crystallites in chars derived from carbonization of coal with and without KOH were analyzed by X-ray diffraction (XRD) technique, activation rates of chars with different contents of K-containing compounds were deduced, and resulting activated carbons were characterized by nitrogen adsorption isotherms at 77 K and iodine numbers. The results showed that the addition of KOH to the coal before carbonization can realize the intensive removal of inorganic matters from chars under mild conditions, especially the efficient removal of dispersive quartz, an extremely difficult separated mineral component in other processes else. Apart from this, KOH demonstrates a favorable effect in control over cool carbonization with the goal to form nongraphitizable isotropic carbon precursor, which is a necessary prerequisite for the formation and development of micro pores. However, the K-containing compounds such as K2CO3 and K20 remaining in chars after carbonization catalyze the reaction between carbon and steam in activation, which leads to the formation of macro pores. In the end an innovative method, in which KOH is added to coal before carbonization and K-containing compounds are removed by acid washing after carbonization, was proposed for the synthesis of quality coal-based activated carbon.     

脱硫微生物氧化亚铁硫杆菌遗传特性的分子生物学试验

利用现代生物学研究方法和手段，对煤系与非煤系氧化亚铁硫杆菌的遗传特性进行了质粒抽提和琼脂糖凝胶电泳等分子生物学水平的基础性探索试验，对于质粒在硫杆菌中普遍存在的观点提出了质疑.研究结果表明，氧化亚铁硫杆菌对Fe²⁺，S等的氧化能力可能只是与拟核染色体DNA有关，而氧化亚铁硫杆菌的遗传物质就是拟核染色体DNA.     

粉煤灰微观特征与干法脱炭实验

采用透射电镜研究了粉煤灰的微观特征 ,提出了降低粉煤灰残余炭含量并提高粉煤灰活性的干法脱炭思路。摩擦电选实验表明 :干法脱炭是有效的 ,这将为解决我国粉煤灰的综合利用提供有益的借鉴     

高压电选机内电晕电流和电场的分布规律

在电选过程中，分选带较短，物料参选时间短，在这很短的时间内完成荷电、放电、最终分离，分选带内滚筒表面附近的电晕电流和电场分布情况就起着直接的决定作用。对电选机内电晕电流和电场分布规律进行了较深入的理论和试验研究，并以此为依据，对电选实践中如何通过调节操作参数、结构参数来改善分选效果进行了分析。研究结果表明：（1）电晕电极的主要作用是产生电晕电流，同时也产生静电场；电晕电流和场强随极间电压升高或极距减小而增强；（2）电晕电流和场强沿接地滚筒表面呈正态分布；（3）静电极主要产生强静电场，静电极对电晕电极的电晕放电有屏蔽作用；（4）在分选过程中应采用高电压、大极距的操作制度和电晕－静电复合电极结构。     

建设具有中国特色的大型坑口电站--燃前采用两段高效干法选煤技术

基于中国社会的经济发展和能源结构，指出煤炭仍是我国21世纪前20年的主要一次能源。分析了当前煤炭利用中存在的严重问题，提出煤炭燃前高效分选的必要性和建立具有中国特色的大型坑口热-电联产电站是煤炭资源生产和消费最优化配置的选择。     

煤泥调浆技术与设备的研究现状及进展

针对目前高灰难选煤泥浮选精煤灰分高、回收率低的难题,提出高效调浆是解决问题的有效途径。从煤泥高效调浆着手,介绍了调浆搅拌技术及理论的研究进展,并对现有煤泥调浆设备的应用及存在问题进行了介绍。在对现有提高调浆效果的理论、方法及技术研究现状进行综述性评价的基础上,探究了煤泥调浆对浮选过程的影响及其规律性,提出了今后煤泥调浆技术研究应从以下4方面展开:研究药剂分散、颗粒分散与表面改性、颗粒碰撞与有效吸附等过程的机理;研究各种搅拌叶轮结构下矿浆的流场变化情况;研究不同煤质及粒度组成下剪切强度对调浆效果的影响;开发新型高效煤泥调浆设备,以满足微细难选煤泥浮选工艺的需求。     

摩擦电选制备低灰煤的研究及应用

应用摩擦电选对七台河５种煤样进行了制备灰分小于２％的低灰精煤的试验研究，并以灰分为１．８５％的低灰精煤为原料制备出优质活性炭     

干法选煤的现状和发展

论述了选煤尤其是高效干法选煤技术的重要性，分析评价了各种干法选煤的优缺点，认为高效空气重介质流化床干法选煤是干法选煤技术的发展方向，并展望了３００－０ｍｍ全粒级高效选煤技术的发展前景。