Superabsorbent Polymer with High Swelling Ratio, and Temperature-Sensitive and Magnetic Properties Employed as an Efficient Dewatering Medium of Fine Coal

摘要

One novel superabsorbent polymer with temperature-sensitive and magnetic properties was prepared by the designed route. As a comparison, the other superabsorbent polymer was prepared by changing the above route. The obtained samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), superconducting quantum interference device magnetometer (SQUID), and gel permeation chromatography (GPC). The temperature-sensitive properties of the obtained polymers were investigated by measuring swelling ratios at given temperatures. The superabsorbent polymer exhibiting the preferable temperature-sensitive, magnetic properties and swelling ratio was employed in the dewatering process of the fine coal. The moisture mass content in the fine coal was decreased to less than 10% within the mixing time 60 min. In addition, it can be found that the polymer with relatively stable responsive properties and swelling ratio can be gained by this method based on the regeneration of the used polymer in the dewatering process.