硅渣与石灰对含硅碱液的协同脱硅作用  

Synergistic Desilication Effect of Silicon Slag and Lime on Alkali Leaching Desilication Solution

作　　者：徐颖鹏 李军旗[1,2] 陈朝轶 XU Yingpeng;LI Junqi;CHEN Chaoyi(School of Material and Metallurgy, Guizhou University, Guiyang 550025, China;Guizhou Province Key Laboratory of Metallurgical Engineering and Process Energy Saving, Guiyang 550025, China)

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550025 [2]贵州省冶金工程与过程节能重点实验室,贵州贵阳550025

出　　处：《贵州大学学报（自然科学版）》2020年第3期36-41,共6页Journal of Guizhou University:Natural Sciences

基　　金：国家自然科学基金项目资助(51774102);贵州省科技创新人才团队建设项目资助(黔科合人才团队[2015]4005号);贵州科技厅项目资助(黔科合平台人才[2017]5788-9号、[2017]5626号)。

摘　　要：碱浸脱硅处理高硅铝土矿时,会产生大量的含硅碱液,要实现其循环利用,需对含硅碱液进行脱硅。本文分别以初始硅渣、焙烧硅渣、硅渣与石灰混合为脱硅剂,对比考查含硅碱液的脱硅效果,并分析脱硅机理。结果表明,当添加25 g/L的初始硅渣时,脱硅率仅为47.96%;将硅渣在600℃焙烧后,脱硅率提升至66.67%。焙烧后的硅渣明显提升了脱硅活性,当混合添加25 g/L焙烧硅渣和钙硅比为1的CaO,脱硅率达到93%,主要是硅渣作为异相成核的晶核,在脱硅过程中的晶体生长以及CaO的协同脱硅作用,混合添加焙烧渣和CaO的高脱硅能力为氧化铝工业生产提供了再循环脱硅剂,并为含硅碱液的循环利用提供了可能性。When high-silica bauxite is treated by alkaline leaching and desilication,a large amount of silicon-containing alkaline solution will be produced.To realize its recycling,the silicon-containing alkaline solution needs to be desiliconized.In this paper,the initial silicon slag,roasted silicon slag,silicon slag and lime mixed as the desilication agent,comparatively examine the desilication effect of silicon-containing alkaline solution,and analyze the desilication mechanism.The results show that when 25 g/L of initial silicon slag was added,the desilication rate was only 47.96%;after the silicon slag was calcined at 600℃,the desilication rate increased to 66.67%.The calcined silicon slag obviously improves the desilication activity.When 25 g/L calcined silicon slag and CaO with a calcium to silicon ratio of 1 are mixed,the desilication rate reaches 93%.The main reason is that,the silicon slag being the crystal nucle us of the foreign phase nucleation,with the crystal growth in the clesilication process and the synergistic desilication of CaO.The high desilication ability of the mixed addition of roasting slag and CaO provides a recycling desilication agent for the alumina industrial production and provides the possibility of recycling of silicon-containing alkaline solution.

关 键 词：高硅铝土矿 脱硅剂 焙烧 氧化钙 硅渣 

分 类 号：TF09[冶金工程—冶金物理化学]