Behavior of Crystallization on a Continuous Solidification Process of Blast Furnace Slag

Behavior of Crack Generation of Slag in Continuous Solidification Process of Blast Furnace Slag

“…Solidified slag plates were produced by the same method as in our previous report. 1,2) Figure 1 shows a schematic diagram of the equipment. The equipment comprises 50 molds arranged in a circle on a carriage, a runner for pouring the molten slag into the molds, a slag pit where the solidified slags are piled and air-cooled, and a spray nozzle unit which is used to cool the molds.…”

“…Figure 3(a) shows the crystal slag and b) shows the slag with a glass layer. Both slags contain few pores, and whereas the absolute density of conventional air-cooled slag is 2.36 to 2.52 g/cm 3 , 1) both of the slags produced by this process were dense, having the absolute density of 2.82 g/cm 3 independent of the presence or absence of the glass layer. No cracks were observed in the crystal slag, cracks had occurred in the slag with a glass layer.…”

“…Yasutaka TA, 1) * Takeru HOSHINO, 1) Hiroyuki TOBO, 2) Keiji WATANABE 3) and Katsunori TAKAHASHI 4) 1) Steel Research Laboratory, JFE Steel Corporation, 1, Kawasaki-cho, Chuo-ku, Chiba, 260-0835 Japan.…”

“…In this research, we studied the behavior of crack generation in the cooling process of solidified slag plates produced using the continuous solidification process for blast furnace slag described in our previous report. 1,2) The hightemperature physical properties of the slag, including tensile strength, compressive strength, Young's modulus, the modulus of rigidity and Poisson's ratio, which are necessary for a thermal stress analysis, were measured, and a thermal stress analysis was conducted using that information and the temperature data from the heat transfer analysis in the previous report. As a result, the conditions for crack generation in solidified slags with a remaining glassy surface and completely crystalline solidified slags were clarified, and a mechanism of crack generation based on the thermal stress in the cooling process was studied.…”

“…In previous research, [1][2][3][4][5][6] we demonstrated that plateshaped solidified slags with few pores and low water absorption suitable for use as coarse aggregate for concrete can be obtained in a continuous process by pouring molten blast furnace slag into steel molds to a thickness of approximately 25 mm. These desirable properties can be achieved because pore formation and growth are suppressed by rapidly solidifying molten slag.…”