Carboxymethylcellulose (CMC) as PbS depressant in the processing of Pb-Cu bulk concentrates. Adsorption and floatability studies
Carboxymethylcellulose (CMC) as PbS depressant in the processing of Pb-Cu bulk concentrates. Adsorption and floatability studies
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DOI：
10.1016/j.mineng.2017.07.012
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发表时间：
2017-10
影响因子：
4.8
通讯作者：
A. López-Valdivieso;Luis A. Lozano-Ledesma;A. Robledo-Cabrera;O. A. Orozco-Navarro
中科院分区：
文献类型：
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作者：
A. López-Valdivieso;Luis A. Lozano-Ledesma;A. Robledo-Cabrera;O. A. Orozco-Navarro
通过电动、吸附和ATR-FTIR光谱研究了CMC在方铅矿(PBS)上的吸附。此外，还进行了CMC在黄铜矿(CuFeS_2)上的吸附实验，并与PbS上的吸附结果进行了比较。以PbS和CuFeS2晶体为浮选剂，乙基黄药为捕收剂，考察了CMC对PbS和CuFeS2可浮性的影响。此外，还研究了矿物氧化对可浮性和CMC吸附的影响。羧甲基纤维素在PbS上的吸附是在羟基络合物PbOH+的显著浓度范围内进行的，其中羧基为CoO−。通过分子内静电作用和CoO-−与PbOH+在PbS/水溶液界面上的酸碱相互作用，推测CMC是通过分子内静电和酸碱相互作用吸附的。乙基黄药在PBS上的吸附比CMC更稳定。氧化作用在PbS表面生成SO4物种，促进CMC的共吸附，使PbS表面在吸附了乙基黄药的基础上变得疏水。氧化时，CMC对高PbS的可浮性有很大的阻碍作用，而CuFeS2的可浮性不受影响。提出了无毒多糖CMC作为PBS的抑制剂，在浮选CuFeS_2的同时用于铅铜混合精矿分离的浮选策略。
Adsorption of CMC on galena (PbS) was investigated through electrokinetic, adsorption and ATR-FTIR spectroscopic studies. In addition, CMC adsorption on chalcopyrite (CuFeS2) was carried out to compare it to that on PbS. The effect of CMC on the floatability of PbS and CuFeS2was assessed by microflotation using PbS and CuFeS2crystals and ethyl xanthate as collector. Furthermore, the effect of oxidation of the minerals on the floatability and CMC adsorption was studied. CMC adsorption on PbS took place within a pH range of significant concentration of the hydroxo-complex species PbOH+wherein the COOH group of the CMC is as COO−. It is proposed that CMC adsorbs through intramolecular electrostatic and acid/base interactions between the COO−and PbOH+at the PbS/aqueous solution interface. Adsorption of ethyl xanthate on PbS is more stable than that of CMC. Oxidation creates SO4species on the PbS surface promoting co-adsorption of CMC, through which the PbS surface becomes hydrophilic on top of the hydrophobicity due to adsorbed ethyl xanthate. Upon oxidation, the high PbS floatability was largely hindered by CMC while that of CuFeS2was not affected. Flotation strategies are presented for the application of the non-toxic polysaccharide CMC as a depressant of PbS in the separation of Pb-Cu bulk concentrates while floating CuFeS2.