矿物加工煤的浮选英文文献及参考文献
参考文献毕业论文http://www.youerw.com
[1] 刘久欣.中国选煤工业的现状和发展趋势[J].煤炭工程,2009，展会特刊,47-53
[2] 中华人民共和国国家统计局,2004中国统计年鉴 [M].北京,中国统计出版社, 2004.
[3] 孙丽梅,单忠健.国外选煤工业现状与未来发展趋势[J].选煤技术, 2005,(4): 49–52
[4] 叶大武.2006年中国选煤和煤炭质量概况[J].选煤技术,2007,(4):1–41
[5] 崔广元,刘惠杰.浅析我国重介质工艺[J].煤炭加工与综合利用,2008,(4):11-13
[6] 梁金钢,赵环帅,何建新.国内外选煤技术与装备现状及发展趋势[J].选煤技术,2008,(1):60-64
[7] 张军,王章国,李云红,匡亚莉.跳汰控制技术现状及发展趋势[J].选煤技术2006,(4):39–41
[8] 康淑云.我国跳汰选煤市场简析[J].中国煤炭,2003,29(4):40-43.
[9] 谢广元.选矿学[M],中国矿业大学出版社,2001,388
[10] 拉符利涅科 浮选设备的生产现状与主要发展方向[J].国外金属矿选矿2007,(12):4-12
[11] 任尚锦,肖永庄.我国几种分力干选机的开发和应用[J].煤炭加工于综合利用 2004,(5):7-9
[12] 邓金迪,沈丽娟.细粒煤脱水技术于设备现状及发展方向[J].矿山机械,2006,(4):77-80
[13] 焦红光,赵继芬.筛分技术的研究现状及发展趋势[J].煤矿机械 2006,(10):8-10
[14] 潘伟尔.中国炼焦煤供需现在、影响困素及其发展趋势[J].中国能源,2003,(11)258-264
[15] 匡亚莉.选煤工艺设计与管理[M].中国矿业大学出版社，2-3
Physical and chemical interactions in coal flotation
Abstract
Coal flotation is a complex process involving several phases (particles, oil droplets and air bubbles). These phases simultaneously interact with each other and with other species such as the molecules of a promoting reagent and dissolved ions in water. The physical and chemical interactions determine the outcome of the flotation process. Physical and chemical interactions between fine coal particles could lead to aggregation, especially for high rank coals. Non-selective particle aggregation could be said to be the main reason for the selectivity problems in coal flotation. It should be a本文来自优文论文网原文请找QQ752018766ddressed by physical (conditioning) or chemical (promoters) pretreatment before or during flotation. Although the interactions between the oil droplets and coal particles are actually favored, stabilization of the oil droplets by small amounts of fine hydrophobic particles may lead to a decrease in selectivity and an increase in oil consumption. These problems could be remedied by use of promoters that modify the coal surface for suitable particle–particle, droplet–particle and particle–bubble contact while emulsifying the oil droplets. The role of promoters may be different for different types of coals, however. They could be employed as modifiers to increase the hydrophobicity of low rank coals whereas their main role might be emulsification and aggregation control for high rank coals. In this paper, a detailed description of the various phases in coal flotation, their physical and chemical interactions with each other in the flotation pulp, the major parameters that affect these interactions and how these interactions, in turn, influence the flotation process are discussed.
Author Keywords: coal; flotation; aggregation
1. Introduction
Conventional froth flotation for fine coal cleaning suffers mainly from two problems: (i) a lack of selectivity for fast floating high rank coals due to the flotation of middlings and entrainment of mineral fines in the froth, and (ii) low recoveries for heavily oxidized or low rank coals due to poor adhesion between bubbles and particles. These shortcomings can be addressed appreciably by selection of better process control and by use of multi-stage flotation circuits [Olson and Aplan, 1984 and Arnold, 2000], which, in turn, requires a good understanding of the roles and behavior of various components in the flotation pulp and the mechanisms involved.
In this paper, a detailed description of the various phases in the coal flotation pulp, their interactions with each other and how these interactions affect the flotation process are discussed.
2. Disperse phases in coal flotation
There are three dispersed phases that constitute flotation pulp: coal particles, oil droplets and air bubbles. These phases interact in water as the medium through various sub-processes during flotation which are identified in Fig. 1. Several parameters affect these sub-processes and hence the outcome of the flotation process. These parameters are divided into four groups as illustrated in Fig. 2. These are: material, chemical, operational and equipment parameters. The parameters that might fluctuate and need adjustment on a regular basis (e.g. daily) are referred to as Level I parameters. Those that are set during the design stage or after a major renovation are referred to as Level II parameters. Some parameters 1413