FeSO_(4)/K_(2)S_(2)O_(8)对微细粒高黏煤泥的化学调控助滤影响  

Chemical regulation of FeSO_(4)/K_(2)S_(2)O_(8) on micro-fine high-viscosity coal slime

作　　者：武晋川 樊民强[1] 刘爱荣[1] 杨宏丽[1] 毕海怡 WU Jinchuan;FAN Minqiang;LIU Airong;YANG Hongli;BI Haiyi(College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学矿业工程学院,山西太原030024

出　　处：《洁净煤技术》2024年第4期212-220,共9页Clean Coal Technology

基　　金：山西省基础研究计划(自由探索类)资助项目(20210302124114)。

摘　　要：含大量高灰细泥的煤泥水在沉降浓缩阶段通常会添加大量高分子聚丙烯酰胺(PAM),加速细粒煤的沉降,但PAM的过量使用使浓缩机底流更加黏稠,导致压滤周期延长。通过向含大量高分子PAM的矿浆中添加无机盐FeSO_(4)、K_(2)S_(2)O_(8)溶液,进行不同药剂用量下煤泥的压滤试验,对药剂添加前后PAM溶液和含PAM矿浆的黏度、颗粒表面电性及颗粒团聚形态进行测试分析,探讨FeSO_(4)、K_(2)S_(2)O_(8)的作用机理。结果表明:FeSO_(4)、K_(2)S_(2)O_(8)可降解矿浆中的大分子PAM,降低矿浆黏度,形成松散的大絮体,提高速度,缩短压滤周期,降低滤饼含水率。由于FeSO_(4)兼具对PAM的化学降解和对微细颗粒的凝聚作用,其助滤效果优于K_(2)S_(2)O_(8)。当FeSO_(4)用量为1000 g/t时矿浆黏度降低482 mPa·s,压滤时间缩短70.97%,滤饼含水率降低2.31%。FeSO_(4)价廉易得,可在选煤厂高泥化煤泥脱水助滤上发挥积极作用。Coal slime water containing a large number of high-ash slime usually adds a large amount of polyacryla-mide(PAM)in the sedimentation and concentration stage,so that the underflow of the thickener will be more viscous,resulting in prolonged pressure filtration cycle.In this paper,by adding inorganic salts FeSO_(4) and K_(2)S_(2)O_(8) solution to the slurry containing a large amount of polyacrylamide,the slime pressure filtration test under different dosage of reagents was carried out.The viscosity of PAM solution and PAM containing slurry before and after the addition of reagents,the surface electrical properties of particles and the morphology of particle agglomeration were tested and analyzed,and the mechanism of FeSO_(4) and K_(2)S_(2)O_(8) was discussed.The results show that FeSO_(4)and K_(2)S_(2)O_(8) can degrade the macromolecular polypro-pylene aminoamide in the pulp,reduce the viscosity of the pulp,form loose large flocs,improve the pressure filtration speed,shorten the pressure filtration cycle,and reduce the water content of the filter cake.Because FeSO_(4) has both chemical degradation of PAM and aggregation of fine particles,its filter aid effect is better than K_(2)S_(2)O_(8).When the dosage of FeSO_(4) is 1000 g/t,the slurry viscosity is reduced by 482 mPa·s,the pressure filtration time is shortened by 70.97%,and the moisture content of the filter cake is reduced by 2.31%.FeSO_(4) is cheap and easy to obtain,which can play an active role in the dewatering and filtra-tion of high mud coal slime in coal preparation plant.

关 键 词：高黏煤泥 加压过滤 无机盐 黏度 降解 

分 类 号：TD94[矿业工程—选矿]