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气泡对浮选精煤压滤压力及脱水性能影响机理

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起泡剂的加入使得煤泥浮选过程中产生稳定性强、黏度高、难以破灭的泡沫,大量泡沫的堆积严重制约了浮选精煤的压滤脱水效果.为探明气泡对浮选精煤的压滤压力及脱水性能的影响机理,使用新型加压脱水装置研究气泡对浮选精煤压滤压力、滤饼位移、滤液质量及滤饼水分的影响规律,并通过ImageJ图像处理、流变特性测试、FBRM试验和SEM表征等一系列方法对脱水机理进行探究.压滤结果表明,充气量为0.3 m3/h时,浮选精煤压滤所需压力由451.2 kg增至540.7 kg,滤饼水分增加10.7个百分点.ImageJ图像处理表明小直径气泡分布占比随充气量的增大而增大,流变性测试表明随充气量增加,浮选精煤黏度增大且动切力τ0由0.994 7 mPa增至1.170 3 mPa,说明颗粒定向重排作用增强;FB RM试验表明气泡的存在使浮选精煤粒径增大,发生凝聚现象,颗粒间相互作用力增大;SEM结果表明气泡使浮选精煤颗粒聚集现象明显.气泡的存在导致浮选精煤颗粒排列更加紧密,颗粒间毛细半径减小,过滤所需压力增大,同时滤饼孔隙变小,水分迁移路径更复杂,不利于水分脱除.
Mechanistic study of the effect of air bubbles on the press pressure and dewatering performance of flotation concentrate coal
The addition of frothing agent makes the coal slurry flotation process produce stable,large viscosity value and difficult to break bubbles,and the accumulation of large amount of bubbles seriously restricts the pressurization and dewatering effect of flotation concentrate coal.In order to investigate the influence mechanism of bubbles on the filtering pressure and dewatering performance of flota-tion concentrate,the influence law of bubbles on the filtering pressure,cake displacement,filtrate quality and cake moisture of flota-tion concentrate using a new pressurized dewatering device was investigated,the dewatering mechanism by a series of methods such as Im-ageJ image processing,rheological characteristics test,FBRM test and SEM characterization was explored.The results show that the pres-sure required to press filter the flotation concentrate increase from 451.2 kg to 540.7 kg at an aeration rate of 0.3 m3/h,and the filter cake moisture increas by 10.7 percentage points.ImageJ image processing shows that the distribution proportion of small diameter bubbles increases with the increase of air volume,rheological test shows that with the increase of air volume,and the viscosity of flotation cleaned coal increases and the dynamic shear τ0 increases from 0.994 7 mPa to 1.170 3 mPa,indicating that the directional rear-rangement of particles is enhanced.The FBRM test show that the presence of air bubbles increase the particle size of flotation concentrate,coalescence occurred,and the interaction force between particles increase.SEM results show that air bubbles make the flota-tion concentrate particles agglomerate.The presence of air bubbles make the flotation concentrate particles more closely arranged,the in-ter-particle capillary radius decrease,the pressure required for filtration increase,and the pore space of the filter cake become smaller,the water migration path is more complicated,which is not conducive to the removal of water.

air bubblesfilter press pressureparticle interactionmechanism of dehydration

杨长华、董宪姝、陈茹霞、樊玉萍、马晓敏、冯泽宇

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太原理工大学矿业工程学院,山西太原 030024

太原理工大学安全与应急管理工程学院,山西太原 030024

气泡 压滤压力 颗粒相互作用 脱水机理

国家自然科学基金国际(地区)合作与交流项目国家自然科学基金青年科学基金山西省基础研究计划青年项目(自由探索类)山西省高等学校科技创新项目山西省高等学校科技创新项目太原理工大学青年科学基金

51820105006520041782021030212230812021L0532021L0632022QN063

2024

10.13226/j.issn.1006-6772.23031402

洁净煤技术
煤炭科学研究总院 煤炭工业洁净煤工程技术研究中心

洁净煤技术

CSTPCD北大核心
影响因子：0.893
ISSN：1006-6772
年,卷(期)：2024.30(5)
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