Xing Dingquan, Sun Ruofan, Ma Shuai, Wen Heping, Wang Zhongchi, Deng Jiushuai
Inner Mongolia Research Institute of CUMTB, Key Laboratory of Separation and Processing of Symbiotic-Associated Mineral Resources in Non-Ferrous Metal Industry, Engineering Technology Research Center for Comprehensive Utilization of Rare Earth-Rare Metal-Rare Scattered in Non-Ferrous Metal Industry, School of Chemical & Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China.
Yuxi Dahongshan Mining Co., Ltd., Yuxi 653405, China.
Molecules. 2024 Feb 29;29(5):1062. doi: 10.3390/molecules29051062.
Surface roughness is a crucial factor that affects the flotation performance of minerals. In this study, the effect of sulfuric acid corrosion on the surface roughness of calcite flotation was investigated through microflotation tests, scanning electron microscopy (SEM-EDS), atomic force microscopy (AFM), Fourier transform infrared (FT-IR) spectroscopy, and contact angle analysis. Microflotation test results show that sulfuric acid treatment has a serious negative effect on the floatability of calcite. When the sulfuric acid dosage was 4 mL (3 mol/L), the flotation recovery of calcite was reduced to less than 19%. SEM-EDS and AFM results verified that the sulfuric acid treatment significantly changed the surface morphology of calcite, reduced the average surface roughness and surface area, and reduced the amount of active Ca sites on the calcite surface. As characterized by FT-IR and contact angle analyses, the sulfuric acid treatment enhanced the hydrophilicity of the calcite surface and reduced the amount of sodium oleate adsorbed on the calcite surface. Consequently, sulfuric acid corrosion can reduce the average surface roughness of calcite and have a serious negative effect on the flotation performance of calcite.
表面粗糙度是影响矿物浮选性能的关键因素。在本研究中，通过微浮选试验、扫描电子显微镜（SEM-EDS）、原子力显微镜（AFM）、傅里叶变换红外（FT-IR）光谱和接触角分析，研究了硫酸腐蚀对方解石浮选表面粗糙度的影响。微浮选试验结果表明，硫酸处理对方解石的可浮性有严重的负面影响。当硫酸用量为4 mL（3 mol/L）时，方解石的浮选回收率降至19%以下。SEM-EDS和AFM结果证实，硫酸处理显著改变了方解石的表面形态，降低了平均表面粗糙度和表面积，并减少了方解石表面活性Ca位点的数量。通过FT-IR和接触角分析表征，硫酸处理增强了方解石表面的亲水性，减少了油酸钠在方解石表面的吸附量。因此，硫酸腐蚀会降低方解石的平均表面粗糙度，并对方解石的浮选性能产生严重的负面影响。
