Abstract <p>The utilization of solid waste as a precursor for preparing glass-ceramics has emerged as an important strategy in resource recycling. This study successfully synthesized glass-ceramics directly from the industrial silicomanganese slag, bypassing the slag re-melting or composition adjustment step, significantly reducing energy consumption and production cost. Specifically, two sets of glass-ceramics were produced: one utilizing 200-mesh silicomanganese slag powder through low-pressure (80 kPa) hot-pressing sintering, and the other using ultrafine slag powder (ball-milled, <i>D</i>_v(50)&#xa0;=&#xa0;4.15&#xa0;<i>μ</i>m) <i>via</i> conventional pressure-less sintering. Glass-ceramics sintered with low pressure exhibited higher densities compared to those sintered without pressure, while the latter exhibited more uniform distributions of crystalline phases. Meanwhile, regardless of particle size, the crystalline phases of both sets of glass-ceramic samples underwent an increase with prolonged sintering time, primarily consisting of Johannsenite and Albite, Ca-bearing. Johannsenite phase exhibited a leaf-like shape with a very thin thickness and a sheet diameter of approximately 1 to 2&#xa0;<i>µ</i>m, while Albite, Ca-bearing phase appeared as rod-shaped crystals with lengths of tens of micrometers. The maximum flexural strengths of the glass-ceramics produced with 200-mesh and ultrafine powders were 137.3 and 136.0 MPa, respectively. Furthermore, the acid and alkali resistances of samples C850-3 (prepared with 200-mesh powder at 850 °C for 3 hours) and F850-2 (prepared with ultrafine powder at 850 °C for 2 hours) were measured to be 99.06 and 99.76 pct, as well as 98.95 and 99.93 pct, respectively. These results demonstrate the potential of utilizing silicomanganese slag as a cost-effective raw material for producing high-performance glass-ceramics.</p> Graphical Abstract <p></p>