DONG Zilong;YANG Qiaowen;DOU Meng;ZHAO Jianbing;

• 1:School of Chemical and Environment Engineering
• 2:China University of Mining and Technology-Beijing

Abstract：

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.

Key Words： selective agglomeration;ultra clean coal;demineralization;oil agglomeration;flotation

Abstract:

Keywords:

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

Authors: DONG Zilong;YANG Qiaowen;DOU Meng;ZHAO Jianbing;

DOI: 10.13226/j.issn.1006-6772.19052202

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