Effects of temperature regime on structure and properties of copper slag glass-ceramics by one-step method

One-step preparation of glass ceramics is a method that can effectively realize the simultaneous utilization of "slag" and "heat" in metallurgical molten slag. In this paper, with copper slag as the research object, by studying the remelting process of copper slag, the remelting conditions close to the field copper slag phase composition were obtained, based on which the effects of different casting temperatures and different crystallization temperatures on the structure and properties of the glass-ceramics by one-step method were explored. The results show that under different temperature systems, the crystalline phases in glass ceramics are dominated by irregular polyhedral spinel and long rod-shaped olivine. Spinel minerals are beneficial to the performance of glass-ceramics, while the large amount of precipitation of olivine is not conducive to its performance, and inproving the casting temperature is conducive to the precipitation of spinel. The temperatures with the maximum rate of olivine and spinel evolution in the parent glass are 1 100 ℃ and 1 050 ℃, respectively. Under the casting temperatures above or equal to 1 500 ℃ and crystallization temperatures below or equal to 1 050 ℃, it is beneficial to inhibit olivine and promote the precipitation of spinel, thus improving the performance of glass ceramics. The optimal heat preparation temperatures of one-step method are at a casting temperature of 1 500 ℃ and crystallization temperature of 1 050 ℃, when the antifolding strength reaches 78.06 MPa.