Inorganic Chemicals Industry >
Study on removal of silicon from high-silicon brucite by sodium roasting method
Received date: 2020-04-12
Online published: 2020-11-24
A sodium-roasting process was employed for removing silicon from high-silicon brucite as raw material,using NaOH as sodium treatment reagent.The effects of NaOH content,roasting temperature and roasting time etc.on Si content of the water-washed roasting products were investigated,respectively.The structure and spectroscopic characteristics of roasting products and the water-washed residues in different roasting temperature were analyzed.The mechanism of removing silicon from high-silicon brucite by sodium-roasting process was revealed.The results indicated that optimal processing parameters were roasting temperature of 650 ℃,3 times theoretical amount of NaOH and roasting time of 3 h.Under these conditions,Na+ substituted Mg2+ of Mg2SiO4 obtained by serpentine decomposition,and the final products were Na4SiO4.The mass fraction of Si in water washed roasting products reached 1.89% and the extraction ratio of Si reached 90.1%.
Key words： high-silicon brucite; sodium roasting; serpentine; silicon removal
Xiaowang Du , Jianchu Zhong , Xiaotian Wang . Study on removal of silicon from high-silicon brucite by sodium roasting method[J]. Inorganic Chemicals Industry, 2020 , 52(10) : 92 -95 . DOI: 10.11962/1006-4990.2019-0634
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