新型抑制剂木质素磺酸钙在赤铁矿和绿泥石浮选分离中的应用

Application of Calcium Lignosulfonate as An novel Depressant in Flotation Separation of Hematite and Chlorite

绿泥石属于层状含铁硅酸盐脉石矿物,与赤铁矿性质接近难以分离,通过单矿物浮选及人工混合矿浮选、吸附量测试、接触角测量、Zeta电位测试、红外光谱(FTIR)和X射线光电子能谱(XPS)探究了木质素磺酸钙(CLS)作为赤铁矿/绿泥石浮选抑制剂的可行性和产生吸附的主要机制。浮选试验结果证明,在pH=10、CLS用量为60 mg/L情况下能有效选择抑制绿泥石,但对赤铁矿的抑制效果不明显,CLS可作为赤铁矿与绿泥石分离的抑制剂。CLS吸附在绿泥石表面,使绿泥石表面显著亲水,同时阻碍了捕收剂十二胺(DDA)在绿泥石表面的吸附。在浮选过程中,CLS的大量磺酸基团吸附在绿泥石表面,改变了绿泥石的表面环境,Ca离子也吸附在绿泥石表面并促进了反应的进行。

Chlorite belongs to the layered iron bearing silicate gangue,which is difficult to separate from hematite,the feasibility of calcium lignesulfonate(CLS)as flotation depressant of hematite/chlorite and the main mechanism of adsorption were investigated through single-mineral and artificial-mixed-ore flotation,adsorption capacity measurement,contact angle measurement,Zeta potential measurement,fourier transform infrared spectroscopy(FTIR)and X-ray photoelectron spectroscopy(XPS).The flotation test results showed that under the condition of pH=10,60 mg/L CLS can effectively selected and depressed chlorite,but the depression effect on hematite is not obvious.CLS can be used as an depressant for the separation of hematite and chlorite.CLS adsorbs on the surface of chlorite,which makes the surface of chlorite significantly hydrophilic,and depress the adsorption of collector dodecylamine(DDA)on chlorite surface.In the flotation process,a large number of sulfonic acid groups of CLS are adsorbed on the surface of chlorite,which changes the surface environment of chlorite,and Ca ions are also adsorbed on the surface of chlorite and promote the reaction.