洁净煤技术

2020, v.26;No.128(04) 40-47

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煤聚团分选过程影响因素和机理研究进展
Research advance on influencing factors and mechanisms of coal selective agglomeration separation process

董子龙;杨巧文;窦蒙;赵建兵;
DONG Zilong;YANG Qiaowen;DOU Meng;ZHAO Jianbing;School of Chemical and Environment Engineering,China University of Mining and Technology-Beijing;

摘要(Abstract):

近年来,基于超纯煤具有高的附加值和优异的性能,作为煤基材料取得广泛关注。为了获得优质的超纯煤,寻求一种经济环保的制备工艺。从超纯煤作为燃料、原料、煤基材料3个方面介绍了其潜在价值。制备超纯煤方法大体上可分为化学法和物理法。由于化学法在制备超纯煤过程中酸碱腐蚀设备,能耗高,并且对煤基结构造成破坏,所以采用经济又环保的选择性聚团法制备超纯煤具有重要意义。选择性聚团法对煤炭中灰分的脱除具有良好的效果,是物理法中制备超纯煤最具有应用前景的方法。精煤灰分和产率是限制该技术发展的关键问题,为了降低精煤灰分和提高产率,综述了选择性聚团在煤炭脱灰过程中的主要影响因素,分析了煤变质程度、粒径、浆液pH值、浆液浓度、搅拌强度和搅拌时间、电解质、分散剂、助剂、乳化油和桥联液等因素对灰分和产率的影响。主要总结了各因素变化对精煤灰分和产率的变化规律。其中煤变质程度、粒径、搅拌强度和桥联液对分选效果影响较大。结果表明,煤变质程度越高,超纯煤的灰分越低。粒径小有利于矿物质与煤机质充分解离,葵花油和豆油为桥联液对高阶煤团聚有效,蓖麻油对低阶煤团聚表现出较强效果,尤其是高灰分煤。向桥联液中加入助剂(甲醇和月桂醇),团聚体减少,灰分降低。讨论了煤聚团过程的作用热力学机理和动力学模型。
In recent years,based on the high added value and excellent performance of Ultra Clean Coal,it has been widely concerned as a coal-based material.In order to obtain high-quality Ultra Clean Coal,a kind of economic and environmental protection preparation technology was studied.The potential value of Ultra Clean Coal as fuel,raw material and coal based material was introduced. The preparation methods of Ultra Clean Coal can be divided into chemical method and physical method.Due to the acid-base corrosion equipment in the process of preparing Ultra Clean Coal by chemical method,the energy consumption is high,and the coal-based structure is damaged.Therefore,it is of great significance to adopt the economic and environmental protection selective agglomeration method to prepare Ultra Clean Coal.Selective agglomeration method has a good effect on ash removal from coal,and it is the most promising method to prepare Ultra Clean Coal by physical method.The ash content and yield of clean coal are the key problems limiting the development of this technology.In order to reduce the ash content and increase the yield of clean coal,the main influencing factors of selective agglomerations in coal deashing process were summarized.The effect of coal metamorphism degree,particle size,slurry p H value,slurry concentration,stirring intensity and stirring time,electrolyte,dispersant,additives,emulsified oil and bridging liquid on ash content and yield were analyzed.In this paper,the change rules of ash content and yield of clean coal were mainly summarized.Among them,coal metamorphism degree,particle size,stirring intensity and bridging liquid have great influence on separation effect. The results show that the higher the degree of coal metamorphism is,the lower the ash content of ultra pure coal is.Small particle size is conducive to the separation of minerals and coal organic matter.Sunflower oil and soybean oil as bridging fluid are effective for agglomeration of high rank coal,while castor oil has a strong effect on agglomeration of low rank coal,especially high ash coal.When additives( methanol and lauryl alcohol) are added to the bridging solution,the aggregates and ash content decrease.The thermodynamic mechanism and kinetic model of coal agglomeration were discussed.

关键词(KeyWords): 选择性聚团;超纯煤;脱灰;油团聚;浮选
selective agglomeration;ultra clean coal;demineralization;oil agglomeration;flotation

Abstract:

Keywords:

基金项目(Foundation): 北京市科委科技计划资助项目(Z161100002616038)

作者(Author): 董子龙;杨巧文;窦蒙;赵建兵;
DONG Zilong;YANG Qiaowen;DOU Meng;ZHAO Jianbing;School of Chemical and Environment Engineering,China University of Mining and Technology-Beijing;

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DOI: 10.13226/j.issn.1006-6772.19052202

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