Qian Hang, Bao Jinpan, Shen Chuxiong, Wu Dan, Wang Jianshe, Hao Haiqing, Zhang Yongsheng
School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China.
National Engineering Research Center for Rare Earth, Grirem Advanced Materials Co., Ltd., Beijing 100088, China.
Materials (Basel). 2023 Jun 29;16(13):4690. doi: 10.3390/ma16134690.
Low-grade and high-reserve scheelite, which is associated with calcite, has similar surface properties that cause difficulty in separation. In this study, sulfomethylated kraft lignin (SMKL) was used as a novel eco-friendly inhibitor for the flotation separation of scheelite and calcite. The flotation test results showed that 60 mg/L SMKL had a significant influence on depressing calcite flotation, while it had a slight effect on scheelite flotation. Furthermore, it enhanced the WO grade of the concentrate in the artificial mixed ore to 62.02% with a recovery rate of 80.37%. The contact angle and zeta potential showed that SMKL could effectively decrease the surface floatability of calcite and caused the negative shift of minerals' surface potential. XPS and DFT calculations revealed that the sulfonic acid group of SMKL had an electron-donating ability and was easily adsorbed on the positively charged surface of calcite, which hindered the adsorption of sodium oleate on calcite. SMKL could separate calcium-bearing minerals with a high efficiency and selectivity, providing a new method for industrial production.
与方解石伴生的低品位高储量白钨矿具有相似的表面性质，这使得分离变得困难。在本研究中，磺甲基化硫酸盐木质素（SMKL）被用作一种新型环保抑制剂，用于白钨矿和方解石的浮选分离。浮选试验结果表明，60mg/L的SMKL对方解石浮选的抑制作用显著，而对白钨矿浮选的影响较小。此外，它将人工混合矿中精矿的WO品位提高到62.02%，回收率为80.37%。接触角和zeta电位表明，SMKL可以有效降低方解石的表面可浮性，并导致矿物表面电位负移。XPS和DFT计算表明，SMKL的磺酸基团具有给电子能力，容易吸附在方解石带正电的表面上，从而阻碍油酸钠在方解石上的吸附。SMKL能够高效、选择性地分离含钙矿物，为工业生产提供了一种新方法。
