Li Jie, Cao Xuerui, Mu Quhan, Lu Yan, Gao Yushu, Bai Kaikai
School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China.
Inner Mongolia Tianhao Fiberglass Co., LTD., Hohhot, 010051, China.
Heliyon. 2024 Jul 26;10(15):e35320. doi: 10.1016/j.heliyon.2024.e35320. eCollection 2024 Aug 15.
The method of preparing borax by low-temperature soda roasting and water leaching of boron-rich blast furnace slag (BRBFS) is a novel method for extracting boron from BRBFS. In order to further improve the water leaching rate of boron, this article mainly studied the low-temperature soda roasting kinetics of BRBFS. The effects of roasting temperature and NaCO addition on the water leaching rate of boron were investigated. The results demonstrate that when the amount of NaCO added is four times of the theoretical amount, the kinetics of NaBO formation can be described by the Nucleation (Avrami) model in the temperature range of 600-700 °C. The corresponding apparent activation energy is 54.45 kJ/mol, and the apparent frequency factor is 215.16 h. It was found that at a roasting temperature of 700 °C,when the amount of sodium carbonate added is twice, three times, and four times of the theoretical amount, the kinetics of NaBO formation matches with 3-D Diffusion (Jander) model, Nucleation and Growth (Avrami-Erofeev) model, and Nucleation (Avrami) model, respectively. With an increase in the amount of NaCO added, the rate-controlling step for the formation of NaBO transitions from being diffusion-controlled to nucleation-controlled.
通过低温苏打焙烧和水浸富硼高炉渣（BRBFS）制备硼砂的方法是一种从BRBFS中提取硼的新方法。为了进一步提高硼的水浸出率，本文主要研究了BRBFS的低温苏打焙烧动力学。研究了焙烧温度和碳酸钠添加量对硼水浸出率的影响。结果表明，当碳酸钠添加量为理论量的4倍时，在600 - 700℃温度范围内，硼酸钠形成的动力学可以用成核（阿弗拉米）模型来描述。相应的表观活化能为54.45 kJ/mol，表观频率因子为215.16 h⁻¹。研究发现，在焙烧温度为700℃时，当碳酸钠添加量分别为理论量的2倍、3倍和4倍时，硼酸钠形成的动力学分别符合三维扩散（扬德）模型、成核与生长（阿弗拉米 - 埃罗费耶夫）模型和成核（阿弗拉米）模型。随着碳酸钠添加量的增加，硼酸钠形成的速率控制步骤从扩散控制转变为成核控制。
