Zou Chengxi, Tang Zhenyu, Xie Wei, Fu Hanguang, Kuang Jiacai, Deng Yingjun, Cao Taishan
Key Laboratory of Lightweight and Reliability Technology for Engineering Vehicle, Education Department of Hunan Province, Changsha University of Science and Technology, Changsha 410114, People's Republic of China.
College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, People's Republic of China.
R Soc Open Sci. 2018 Aug 8;5(8):172342. doi: 10.1098/rsos.172342. eCollection 2018 Aug.
The study reported was intended to improve the leaching rate of boron-bearing tailings, using a method of sodium roasting that uses boron-bearing tailings as the raw material and NaCO as the sodium agent. The effects of the roasting temperature and NaCO amount on the leaching rate of boron-bearing tailings are mainly evaluated. The morphology and composition of the samples after sodium roasting are analysed by scanning electron microscopy and X-ray diffraction. The results show that sodium roasting can significantly improve the leaching rate of boron-bearing tailings. Under the optimal conditions where roasting temperature is 950°C, NaCO amount is five times the theoretical amount and roasting time is 2 h, the leaching rate of boron-bearing tailings is up to 86.78%. Based on the analysis of the characterization results and the mechanism analysis of the sodium roasting process, the main reason for the increase of leaching rate is the reaction between NaO produced by the decomposition of NaCO and the boron in boron-bearing tailings resulting in soluble sodium borate. The results provide a scientific basis for the efficient comprehensive use of boron-bearing tailings.
所报道的这项研究旨在提高硼尾矿的浸出率，采用以硼尾矿为原料、以碳酸钠为钠剂的钠焙烧法。主要评估焙烧温度和碳酸钠用量对硼尾矿浸出率的影响。通过扫描电子显微镜和X射线衍射分析钠焙烧后样品的形貌和组成。结果表明，钠焙烧可显著提高硼尾矿的浸出率。在焙烧温度为950℃、碳酸钠用量为理论用量的5倍、焙烧时间为2小时的最佳条件下，硼尾矿的浸出率高达86.78%。基于表征结果分析和钠焙烧过程的机理分析，浸出率提高的主要原因是碳酸钠分解产生的氧化钠与硼尾矿中的硼反应生成可溶性硼酸钠。该结果为硼尾矿的高效综合利用提供了科学依据。
