Studies On Coal Slurry Processing Mechanism Based On The Inhibition Of Clay Minerals Expansion And Hydration

The clay minerals has been considered to be the main factors affecting the coal slurry treatment. Efficient sedimentation and rapid pressure filtration in coal slurry treatment has been the pursuit of goals in the coal preparation industry. In this study, montmorillonite and kaolinite are the main objects, sedimentation experiments of coal slurry mixed with clay minerals and pure coal were done. The results showed that the montmorillonite is the main factors of sedimentation. Effect of water and electrolyte solution to coal slurry sedimentation was studied. The results showed that K+solution can inhibit the expansion and hydration of the montmorillonite. The new process of electrolyte solution for coal washing was put forward. According to the mixed coal slurry experimental comparison results, a reasonable method to calculate the dosage due to clay minerals content was determined. From the pressure filtration experiments results, the method of calculate the pressure filtration effects (filter cake moisture) were determined according to the particle size distribution, the clay mineral content, ash and other indicators. After sedimentation and pressure filtration experiments in the field of raw coal, the results showed that using K+solution to coal slurry process can effectively solve the problems of coal slurry difficult sedimentation, and then improve the efficiency of filter press, and does not have a negative impact on the existing heavy media proccessing and flotation, and save a lot of flocculant Pharmacy. According to the formula and the law, the sedimentation of the dosing and cake moisture can be predicted, effective guidance on-site production.