Preparation of clean coal by flotation following ultra fine liberation

This paper reports the results of current fundamental research at the Department of Process Engineering, University of Miskolc on the processing of clean coal from Mecsek bituminous coal, Southern Hungary. The theoretical possibility of the separation of different petrographic components was proven experimentally and their liberation degree was determined based on the petrographic composition, flotation kinetic study of isolated components (groups of components), scanning electron microscopy and microprobe analyses. The mill with stirred ball media was chosen for the ultra-fine liberation of the coal components. It was revealed that along with the liberation of coal components, their surface oxidation and spontaneous agglomeration, entrapping the mineral impurities take place in ultra-fine grinding. This paper discusses the interfacial phenomena occurring in the ultra-fine grinding process and their influence on the flotation. The concept for the advanced preparation of clean coal was developed, tested and proved. The main steps of this concept are the ultra-fine liberation in the stirred-media mill, the de-agglomeration of flocs spontaneously formed during the ultra-fine grinding and the induced (hydrophobic) flocculation with the following two-step flotation in a flotation column.     

微细粒技术在洁净煤技术中的作用和地位

从煤加工利用对颗粒粒度及其分布的要求，解离度对超纯煤的制备以及煤炭组分工业化分离的影响等方面论述了微细粒技术在洁净煤技术中的作用和地位。研究表明煤的粒度及其分布对水煤浆制备及其利用，燃烧等有极其重要的影响；     

Internet Studies and Development Discourses: The Cases of China and India

This paper investigates Internet studies in two leading developing countries (i.e. China and India) and finds that the Chinese scholarly community relies on the discourse of liberation from the state as a form of critique, whereas Indian Internet studies question the discourse of modernization to contemplate about the success and failure factors of information and communication technologies in development. The difference generally reflects the academic responses to the development discourses embraced by the two governments. We suggest that Internet studies should not only respond to the realities but also transcend the contextual constraints to direct attention to the often neglected dimensions of development, which are to make actual impacts through allowing the people and the communities to define their own development discourses as well as building research institutions that are oriented to influence policy-making.     

炼焦中煤深度降灰的研究

分析了中国炼焦煤的储量及利用情况，从利用中国优质煤炭资源的角度出发，以范各庄选煤厂1．40—1．60密度级中煤为实验煤样，以氯化锌为重液，采用浮沉方法将中煤按密度分级，各密度级煤样经磨细后，采用了絮团——浮选工艺，回收各密度中的低灰精煤；探讨从范各庄选煤厂中煤中分选出优质低灰精煤的条件。经过分级及分选后，在相同的分选密度的情况下，总精煤灰分可以降到8．14％以下。     

高兹劳动解放思想及其对和谐社会建设的意义

高兹的劳动解放思想是其思想体系的重要组成部分。高兹通过对现代西方发达资本主义社会的批判,阐述劳动解放实现的路径和目标。高兹的劳动解放思想是解读高兹劳动总体思想体系的切入口。它深化了马克思的劳动解放思想,却由于其人本主义的价值立场又有明显的局限性,只是一个理论的乌托邦,但对中国的和谐社会建设具有重要的理论和现实意义。     

Review of Community Psychology: In Pursuit of Liberation and Well-being.

Reviews the book Community Psychology: In Pursuit of Liberation and Well-being, edited by Geoffrey Nelson and Isaac Prilleltensky (2005). As their subtitle suggests, the authors are concerned with many matters beyond a mental health focus. Although they modestly describe themselves as "editors," Nelson and Prilleltensky actually wrote most of the book, with only Parts 5 and 6 devoted to the work of others. In Part I, the authors introduce their project for community psychology, offering "issues, values, and tools for liberation and well-being." In Part II, "Values, Principles, and Conceptual Tools," the authors talk about sources of values and the way values are chosen to inform research and action. Part III, "Tools for Action," is devoted to interventions at various levels: social, organizational, small group, and individual. In Part IV, the authors present "Tools for Research." Part V presents diverse topics that include marginalization; globalization, poverty, and social justice; colonization and racism; immigration, adaptation, and the challenges of cultural diversity. Part VI, a final "look toward the future," talks about the new aims and definitions of community psychology presented by this text. This books is one of those rare texts that fully meets the twin purposes of providing ideas for the mature community psychologist as well as working as a text for advanced students. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Understanding phosphorus phases in sewage sludge ashes: A wet-process investigation coupled with automated mineralogy analysis

Phosphorus (P) recovery from SSA (sewage sludge ashes) is highly relevant to address future P-shortages. Efficient recycling strategies require an in-depth knowledge of P-phases present. These may be subject to changes during treatment. Treatment was simulated, initial and treated material studied using automated mineralogy. Automated mineralogy, using the MLA system, is an established tool in ore processing evaluation and adapted here to examine P-phases in SSA. Coupling SSA treatment for P-recovery routines with MLA investigations allows for documenting phase compositions during chemical and thermochemical processes. Behaviour of P-phases during treatment and type of SSA govern P-recycling capacity. Findings lend additional insight to the identification of SSA types.Two different P-recovery routines have been investigated. Target phase groups (phosphates) have successfully been digested. Understanding phosphate setup in terms of composition, particle sizes and phase association is vital for an efficient P-extraction from SSA. P-recovery is not straightforward, but rather a series of steps in order to address different P-phase types. SSA is a complex secondary resource, which needs to be understood prior to P-extraction.     

新工艺流程提高选铜回收率试验研究

针对某铜矿铜、硫的组成和性质比较复杂、嵌布粒度细、共生关系密切,新工艺流程提高了中矿单体解离度,延长了矿物的浮选时间,回收率得以有效的提高,减少了金属流失,经济效益明显.     

长坡选矿厂生产工艺技术改造实践

针对长坡选矿厂所处理矿石品位低、粒度细且部分呈浸染状分布、原有前面重选单室跳汰机处理能力小、粗粒尾矿丢废率低、丢尾金属品位较高且硫化矿部分氧化的情况,采取更换跳汰机、取消枱浮系统、完善矿浆浓缩设施等改造措施,不仅降低了选矿成本,而且锡、铅锑、锌的回收率分别提高了3.07、4.84、6.12个百分点.