表面活性剂在红土镍矿高压酸浸中的抑垢作用

Effect of surfactant on laterite ore slurry properties and scale formation in high pressure acid leaching

研究了红土镍矿浸出过程中高压釜结垢与抑垢问题。采用XRD和SEM分析研究了表面活性剂十二烷基苯磺酸钠对结垢物相和形貌的影响,并考察了表面活性剂对矿浆性质的影响。研究发现十二烷基苯磺酸钠可以减小矿浆表面张力和黏度,添加量为70mg·L-1时抑垢效果显著,对镍浸出率影响不明显,可以缓解红土镍矿高压酸浸过程中反应器结垢问题。

The scale formation and inhibition on the autoclave inner surface during high pressure acid leaching of laterite ore were investigated. The composition and morphology of scale were analyzed by using XRD and SEM. The effect of surfactant sodium dodecyl benzene sulfonate on the slurry properties was also studied. It was found that the addition of surfactant could decrease the surface tension and viscosity of the slurry. The optimized content of surfactant was 70 mg ·L^-1 to inhibit scale formation. The addition of surfactant had little influence on nickel extraction.