Chemical regulation of FeSO4/K2S2O8 on micro-fine high-viscosity coal slime
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 filtra-tion cycle.In this paper,by adding inorganic salts FeSO4 and K2S2O8 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 slur-ry 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 FeSO4 and K2S2O8 was discussed.The results show that FeSO4 and K2 S2 O8 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 FeSO4 has both chemical degradation of PAM and aggregation of fine particles,its filter aid effect is better than K2S2O8.When the dosage of FeSO4 is 1 000 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 fil-ter cake is reduced by 2.31％.FeSO4 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.
high viscosity slimepressurized filtrationinorganic saltviscositydegradation
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