硼镁石浮选过程中木质素磺酸钙对蛇纹石的抑制机理  

Inhabitation Mechanism of Calcium Lignosulfonate on Serpentine During Ascharite Flotation

作　　者：韩恩泽 李治杭 程宏飞 熊堃 HAN En-ze;LI Zhi-hang;CHENG Hong-fei;XIONG Kun(School of Earth Science and Resources,Chang an University,Xi'an 710054,China;State Key Laboratory of Mineral Processing,Beijing 102200,China)

机构地区：[1]长安大学地球科学与资源学院,陕西西安710054 [2]矿物加工科学与技术国家重点实验室,北京102200

出　　处：《光谱学与光谱分析》2025年第3期784-788,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(52304281);矿物加工科学与技术国家重点实验室开放基金项目(BGRIMM-KJSKL-2023-04)资助。

摘　　要：蛇纹石作为一种层状硅酸盐矿物,易碎易泥化,微细蛇纹石颗粒会显著恶化浮选环境,对浮选指标产生不利影响。硼镁石和蛇纹石是硼铁矿石中最主要的非金属矿,二者密切伴生,嵌布粒度细,需在较细粒度下才能进行分选。然而,大量微细粒蛇纹石的存在不仅降低了硼镁石浮选回收率,还会随硼镁石进入精矿中,影响精矿的质量。有效抑制蛇纹石成为解决硼镁石浮选问题的关键。木质素磺酸钙作为一种阴离子抑制剂,其在蛇纹石表面作用的研究较少,抑制机制尚不十分明确。通过浮选试验、Zeta电位分析、XRD及XPS等方法讨论了木质素磺酸钙对蛇纹石的抑制机理。试验结果表明,在pH>8时蛇纹石能够显著降低硼镁石浮选回收率。pH值升高至10时,硼镁石浮选回收率降低至42.8%,并且精矿中蛇纹石回收率达到17.6%。在木质素磺酸钙用量20~40 mg·L^(-1)时,蛇纹石回收率被降低至5%以下,而硼镁石浮选回收率提升至66%左右。机理分析表明,木质素磺酸钙吸附在蛇纹石表面后能降低蛇纹石表面电位,它通过化学吸附和氢键的共同作用吸附于蛇纹石表面。前者通过作用于蛇纹石表面的Mg原子而实现,后者则是木质素磺酸钙的酚羟基和蛇纹石中羟基结构作用的结果。As a layered silicate mineral,serpentine is easy to slime.Fine serpentine particles can significantly deteriorate the flotation environment and adversely affect flotation indexes.Ascharite and serpentine are the most important non-metallic ores in paigeite ore.They are closely associated with each other and have fine particle size,so they need to be sorted under fine particle size.However,a large quantity of fine serpentine particles not only reduces the recovery of ascharite but also flows into the concentrate with ascharite,leading to the low quality of the concentrate.Effective inhibition of serpentine is the key to solving the problem of as charite flotation from serpentine.As an anion inhibitor,the effect of calcium lignosulfonate(CLS)on the serpentine surface has rarely been studied,and the inhibitory mechanism is unclear.Flotation test,Zeta potential analysis,XRD,and XPS discussed the inhibition mechanism of CLS on serpentine.Flotation test,Zeta potential analysis,XRD,and XPS discussed the inhibition mechanism of CLS on serpentine.The experimental results show that serpentine can significantly reduce the recovery rate of ascharite flotation when pH>8.As the pH value increased to 10,the recovery of ascharite decreased to 42.8%,and the serpentine recovery was 17.6%in concentrate simultaneously.However,the serpentine recovery was reduced to less than 5%and the ascharite recovery was up to about 66%when the 20~40 mg·L^(-1) CLS was used in flotation.The mechanism analysis shows that the adsorption of CLS on the serpentine surface can reduce the Zeta potential of serpentine,which is attributed to influences of chemical adsorption and hydrogen bonding.The former is achieved by forming a bond with the Mg atom on the serpentine surface,and the latter is the result of the interaction between the phenolic hydroxyl group of CLS and the hydroxyl group in serpentine.

关 键 词：蛇纹石 硼镁石 木质素磺酸钙 吸附 抑制机理 

分 类 号：TD985[矿业工程—选矿]