Study of Boronizing Mechanism of High‐Alumina Slag

Abstract

As the Al2O3 content of the iron‐making raw materials increasing, the Al2O3 content in the slag increases as well, which is the certain result in the development of the iron‐making process. Based on the slag which was from the 2# blast furnace in Hebei Qianan of China, 7 different kinds of B compositions were added. The viscosity values of the CaO ‐MgO‐Al2O3‐SiO2‐B2O3 system were measured by using the torque. The SEM and EDS apparatus were used to observe the variation characteristics of the boronizing slag of the blast furnace. Viscosity mechanism model of the boronazing high‐alumina slag was got from the analysis of the EDS compositions. These detailed analysis including the influence on the slag forming components result from different B contents which shows the conclusion that the suitable B content makes good to the viscosity, melting temperature and stability of high‐alumina slag.

Molecular Dynamics Simulation on the Influence of Al2O3 on the Slag Structure at 1873 K

“…The high value of NBO/T means the low degree of polymerization. The relation between the viscosity and NBO/T for CaO-SiO 2 Where, is the viscosity of the slag, Pa s; T is the absolute temperature, K. Here, the NBO/T is evaluated by the following formula.…”

“…For example, nowadays in China, the Al 2 O 3 content in the blast furnace slag increases by using the Australian ore fines to replace the Brazilian ore fines. The mass percentage of Al 2 O 3 in the slag is usually allowed to be lower than 15% to meet the demand of the blast furnace at present, but if the Al 2 O 3 content is higher in the final slag, the viscosity of the slag increases [1,2] , and the g g y g ( ) flowability and desulphurization ability [3,4] will decrease dramatically, causing various severe problems for the smooth and stable operation of the blast furnace. Owing to viscosity measurements are both time consuming and difficult at high temperatures, a large number of prediction models [1,[5][6][7][8][9][10][11] for viscosity have been developed.…”

“…Owing to viscosity measurements are both time consuming and difficult at high temperatures, a large number of prediction models [1,[5][6][7][8][9][10][11] for viscosity have been developed. Molecular dynamics (MD) simulation [2,[12][13][14][15][16][17][18][19] , which is an excellent tool for studying the microstructure with classical dynamics, has been generally used in the metallurgical melt for decades. The CaO-Al 2 O 3 melt was studied by Belashchenko et al [18] with the method of MD simulation.…”

Effects of Basicity and Al2O3 Content on Viscosity and Crystallization Behavior of Super-High-Alumina Slag

“…Moreover, a tremendous amount of slag with high Al 2 O 3 is produced during the ferronickel alloy and ferrochromium alloy production process [19][20][21]. As we know, the fluidity property of slag has a considerable influence on the smelting process and separation of metals from slag [22][23][24][25][26]. Therefore, it is vital to study the viscosity and crystallization behavior of high-alumina slag.…”

Influence of Al2O3, CaO/SiO2, and B2O3 on Viscous Behavior of High Alumina and Medium Titania Blast Furnace Slag

“…It has been found that the little amount of B 2 O 3 remarkably improved the properties of slag [11][12][13][14][15]. Influence of B 2 O 3 on high titanium (above 20%) BF slag [11][12][13]16], medium titanium (10%-20%) BF slag [14], and high alumina (above 15%) BF slag [17,18] has been studied in previous reports. However, it is hard to find investigations on the viscous behavior of high alumina (above 15%) and medium titania (15%-20%) BF slag (HAMT BF slag) and the influence of B 2 O 3 , Al 2 O 3, and basicity on viscous behavior.…”