Microwave thermal pre-treatment and calcination of biomineralised sorbents for calcium looping

Harnessing Microwave Technology for Enhanced Recovery of Zinc from Industrial Clinker

“…The technology for extracting zinc from clinker comprises three main stages: grinding the clinker to 90% of the -0.071 + 0 mm size fraction, microwave phase transformation, and leaching with H 2 SO 4 . The steps, depicted in Figure 1, include sample preparation; firing of the clinker in the high-temperature microwave reactor of the "ENERGY K-50" unit (Ust-Kamenogorsk, Kazakhstan) (915 MHz, 25 kW), which is advantageous for its high power, stable operation [25][26][27][28][29], and increased efficiency; and the subsequent leaching of the clinker (Figure 2). The leaching of the clinker was conducted in an H 2 SO 4 solution with a concentration of 100 g/dm 3 for 6 h at a stirring speed of 300 rpm, a solid to liquid ratio of 1:5, and a temperature of 293 K. solution with a concentration of 100 g/dm³ for 6 h at a stirring speed of 300 rpm, a solid to liquid ratio of 1:5, and a temperature of 293 K.…”