Abstract:

The fundamental purpose of the experiment of hot-pressing molding likeness flagstones with iron-tailings powder is to seek an effective way of recycling abandoned iron-tailings powder and make it as the architectural profiles that have been massive consumed in construction markets and with high additional value. So the hot-pressing molding likeness flagstones have been experimented with iron-tailings powder based on the principle of glass-ceramic forming. Four types of mixed power have been used in the hot-pressing molding experiment. And the common component of the mixed power are iron-tailings powder, Al₂O₃、MgCO₃、CaCO₃、BaCO₃ and Na₂CO3. Using the hydraulic extrusion intermediate frequency heating furnace, they have been hot-pressing molded with in temperature range 900 to 1 000℃, in the pressure range 10 to 20 MPa, in temperature rising time range 5 to 8 minutes and in temperature holding time range 10 to 30 minutes. The samples of the hot-pressing molding with iron-tailings powder were cooled to room temperature inside the furnace or outside the furnace. The experimental results show that the iron-tailings powder can be used to make stone-like material by hot-pressing when added the suitable additives and tailor the temperature and pressure. The best temperature range is 950 to 1 000℃. The hardness of the  made material has a nonlinear relationship with the pressure. When the pressure surpasses 15 MPa the hardness of the made material has obvious improvement. The most Rockwell hardness of all samples is HRC 37.

Key words: iron-tailings powder, hot pressing, sintering, experiments