海藻酸钠改性锌精矿的制备与表征

Surface modification of sphalerite with sodium alginate

为了克服锌精矿颗粒在浸出液中的聚团问题,减少有机溶剂的夹带损失,采用表面活性剂海藻酸钠对锌精矿进行表面改性研究.利用分散性实验、测定吸油率、红外光谱(FT-IR)、X射线电子能谱(XPS)等测试方法对改性前后的锌精矿进行了分析和表征.实验结果表明,改性后的锌精矿颗粒在水中表现出良好的分散性.沉降体积由0·85ml·g-1降至0·70ml·g-1,吸油率由0·15ml·g-1降至0·07ml·g-1.对改性前后锌精矿的IR谱和XPS能谱图的分析表明,改性后的锌精矿颗粒表面包覆了一层改性剂,改性剂以化学键结合于矿粒表面,对矿粒产生静电和位阻的复合稳定作用.

In order to prevent sphalerite particles from agglomeration in leaching solution, and to reduce the loss of organic solvent, surface modification of sphalerite with sodium alginate was investigated. The modified sphalerite particles were characterized by dispersion experiments, determination of adsorption rate of oil, FT-IR spectra and X-ray photoelectron spectra. The results showed that the modified sphalerite particles showed good dispersibility in water. The sedimentation volume was reduced from 0.85 ml · g^-1 to0.70 ml· g^-1. The adsorption rate of oil reduced from 0.15 ml· g^-1 to 0.07ml· g^-1. The FT-IR and XPS spectra indicated that some modification regent was coated on the particle surface. The modifier was bonded on the sphalerite particle surface through chemical bond, resulting in the combined stabilization action of electrostatic and steric effect.