洁净煤技术

2020, v.26;No.130(06) 102-108

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无机盐与表面活性剂对细粒低阶煤脱水效果的影响
Effect of inorganic salts and surfactants on dewatering performance of fine low-rank coal slime

颜阳;黄鲁华;
YAN Yang;HUANG Luhua;CHN Energy Shendong Coal Preparation Centre;National Engineering Research Centre of Coal Preparation and Purification,China University of Mining and Technology;

摘要(Abstract):

针对布尔台选煤厂细粒低阶煤水分高、脱水难的问题,采用无机盐和表面活性剂对低阶煤泥的脱水效果进行研究。结果表明,布尔台选煤厂煤样具有粒度细、高密度级含量高、表面含氧官能团和杂质矿物丰富等特点。使用FeCl_3和PAC对煤泥进行脱水时,过滤速度显著增加,分别增加0.129和0.113 mL/(s·cm~2),滤饼水分有所降低;采用表面活性剂脱水时,DTAC和Tween 85的作用使得过滤速度大幅加快并且可以降低滤饼水分,此时滤饼水分降低0.69%和1.03%,过滤速度增加0.301和0.152 mL/(s·cm~2);在无机盐与表面活性剂混合组分中,非离子型Tween 85组和阴离子型油酸钠组脱水效果明显改善,Tween 85与FeCl_3、PAC共同存在时,滤饼水分分别降低1.39%、1.52%,过滤速度分别增加了0.044和0.040 mL/(s·cm~2)。油酸钠与FeCl_3、PAC共同存在时,滤饼水分分别降低2.79%、2.61%,过滤速度分别增加了0.026和0.021 mL/(s·cm~2)。FeCl_3和PAC的介入可使DTAC表面活性降低,对Tween 85的表面活性影响较小,但可使油酸钠表面活性大幅增加。3种表面活性剂的存在对低阶煤表面的疏水性有一定改善作用,而无机盐的加入促进了阴离子型和非离子型表面活性剂在低阶煤表面的吸附,进而增强了对低阶煤表面疏水性的改善。
Aiming at the problems of high moisture content and the difficulty in dewatering of fine low rank coal particles in the Boertai coal preparation plant,in this paper,the dewatering performance of low rank coal slime was evaluated by using inorganic salts and surfactants.The results show that the coal samples from Boertai coal preparation plant have the characteristics of fine particle size,great high-density content,abundant surface oxygen-containing functional groups,and high gangue content. When FeCl_3 and PAC are used to dewater coal slime,the filtration rate increases significantly by 0.129 and 0.113 mL/( s·cm~2) respectively,and the moisture content of filter cake decreases to a certain extent; when using surfactant,DTAC and Tween 85 accelerate the filtration speed greatly and reduce the moisture content of filter cake,the moisture content of filter cake decreases by 0. 69% and 1. 03%,and the filtration rate increases by 0. 301 and0.152 mL/( s·cm~2); in the mixture of inorganic salt and surfactant,the dehydration effect of non-ionic Tween 85 and anionic sodium oleate is significantly improved.When Tween 85 co-existes with FeCl_3 and PAC,the cake moisture decreases by 1.39% and 1.52% respectively,and the filtration rate increases by 0.044 and 0.040 mL/( s·cm~2),respectively. When sodium oleate co-existes with FeCl_3 and PAC,the moisture content of filter cake decreases by 2.79% and 2.61%,and the filtration rate increases by 0.026 and 0.021 mL/( s·cm~2),respectively. FeCl_3 and PAC can decrease the surface activity of DTAC,and have little effect on the surface activity of Tween 85,but can increase the surface activity of sodium oleate significantly. The results show that the existence of three surfactants can improve the surface hydrophobicity of low rank coal,and the addition of inorganic salts promotes the adsorption of anionic and non-ionic surfactants on the surface of low rank coal,thus enhancing the improvement of surface hydrophobicity of low rank coal.

关键词(KeyWords): 低阶煤;脱水;表面活性剂;无机盐;滤饼水分
low rank coal;dehydration;surfactant;inorganic salt;filter cake moisture

Abstract:

Keywords:

基金项目(Foundation): 国家能源集团科技创新项目(CSIEZB170204990)

作者(Author): 颜阳;黄鲁华;
YAN Yang;HUANG Luhua;CHN Energy Shendong Coal Preparation Centre;National Engineering Research Centre of Coal Preparation and Purification,China University of Mining and Technology;

Email:

DOI: 10.13226/j.issn.1006-6772.20070901

参考文献(References):