Abstract
To evaluate the crystallization behavior of Ti-bearing blast furnace slag-based glass ceramics, SiO2-Al2O3-CaO-MgO-TiO2 systems with various TiO2 were investigated. The crystallization process and mechanical properties were analyzed. The results show that with TiO2 increasing, exothermic peak temperature (Tp) decreases, and the crystallization is promoted by the introduction of TiO2. A small amount of TiO2 (≤4%) addition can significantly promote crystallization, and when TiO2 continues to increase, the crystallization is decreased slightly. The Avrami parameter (n) of all samples is less than 4, indicating that in prepared glass-ceramics, it is hard to achieve three-dimensional crystal growth. The main crystalline phase is akermanite–gehlenite. The addition of TiO2 has no obvious effect on the type of main crystalline phase. The prepared glass-ceramic with 4% TiO2 show good mechanical properties with the hardness values of 542.67 MPa. The recommended content of TiO2 is 4% for preparing glass-ceramics.
Highlights
China is the largest steel producer in the world, and the steel production capacity constantly increases
The crystallization temperature can beat at Figure are the curves of thethe glass samples with different
The crystallization of other samples was only performed by surface crystallization at any other heating rate
Summary
China is the largest steel producer in the world, and the steel production capacity constantly increases. About 50% of the solid waste generated in the metallurgical industry is blast furnace slag, which is one of the important components of metallurgical solid waste [1]. Ti-bearing blast furnace slag is up to 3 million tons per year [2,3]. For blast furnace slag accumulated in a slag yard for a long time, improper handling will cause potential and long-term harm to the environment. The main method of comprehensive utilization is to produce building materials with low added value, such as cement, concrete, and bricks. The blast furnace slag produced by an iron and steel plant contains less than 8% TiO2 , which is a typical low or medium
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