疏水改性对粗精煤泥助滤脱水效果的影响研究  

Experimental study of the effect of hydrophobic modification on dewatering of clean coarse slime

作　　者：年立营 孙文佳 李肖飞 朱家强 NIAN Liying;SUN Wenjia;LI Xiaofei;ZHU Jiaqiang(Linhuan Coal Preparation Plant,Huaibei Mining(Group)Co.Ltd.,Huaibei 235000,China;School of Materials Science and Engineering,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]淮北矿业(集团)有限责任公司临涣选煤厂,安徽淮北235000 [2]安徽理工大学材料科学与工程学院,安徽淮南232001

出　　处：《选煤技术》2024年第1期18-23,共6页Coal Preparation Technology

摘　　要：为厘清疏水改性对粗精煤泥助滤脱水的影响规律,以临涣选煤厂粗精煤泥为研究对象,基于其矿物组成、粒度组成分析,采用过滤脱水、离心脱水试验研究了十六烷基三甲基氯化铵(1631)、十二烷基三甲基氯化铵(1231)和自研药剂(UTG-1,UTG-2)等四种疏水改性剂对粗精煤泥助滤脱水效果的影响,并分析了疏水改性强化粗精煤泥脱水的作用机理。试验结果表明:粗精煤泥中杂质的主要成分为蒙脱石、高岭石和石英,且这些杂质在细粒级中含量更高,不利于脱水;过滤脱水试验中,UTG-1的效果最佳,体现为用量小(200g/t)、水分降幅大(由15.83%降低至低于8%)、过滤速度也有所提升,同时提高搅拌强度可一定程度上增强疏水改性对粗精煤泥水分的降低效果;离心脱水试验中,1631的降水效果最佳,体现为水分降低幅度较大(约3.61个百分点)且效果更加稳定。机理分析表明:与疏水改性剂作用后,煤样表面更加疏水,从而有利于降低滤饼水分并提高脱水效率。研究结果可为选煤厂降低精煤水分、提高精煤脱水效率提供一定借鉴。An experimental study is made with the slime samples collected from Linhuan Coal Preparation Plant to explore the effect of hydrophobic modification on dewatering of clean coarse slime.According to both mineral and size analysis of the slime,filter and centrifugal dewatering tests are conducted with the use of four different hydrophobic modification agents−hexadecyl trimethyl ammonium chloride(1631),dodecyl trimethyl ammonium chloride(1231)and self-developed UTG-1 and UTG-2,to analyze the effects that can be produced on promotion of dewatering of slime and the mechanism of action of the modifiers.As revealed by test results,the impurities in the slime are predominately montmorillonite,kaolinite and quartz with a high proportion of fine sizes,which is unfavorable for the dewatering of the slime;filter dewatering of the slime can be favorably promoted by all the modifiers with the UTG-1 being the best in effect as its use at a small dosage of 200 g/t can lead to drastic reduction of moisture of filter cake from 15.83%to less than 8%and increase of filtering rate.And the increase of agitating intensity to a certain extent can help further reduce the cake moisture.Result of centrifugal dewatering test shows that the agent 1631 stands out among the other agents for its best and more stable effect and the ability to help reduce the moisture by a big margin(about 3.61 percentage points).Analysis of mechanisms of action of the agents shows with the use of the modifiers,the coal surface becomes more washer repellent which is helpful to reduction of cake moisture and improvement of dewatering efficiency.The study-de-rived achievements may serve as a reference for coal preparation plants to improve clean coal dewatering effi-ciency.

关 键 词：助滤脱水 粗精煤泥 过滤脱水 离心脱水 疏水改性 药剂用量 搅拌强度 

分 类 号：TD946.2[矿业工程—选矿]