(1. 中南大學(xué) 冶金與環(huán)境學(xué)院，長(zhǎng)沙 410083；
2. 中南大學(xué) 粉末冶金研究院，長(zhǎng)沙 410083)
摘 要: 結(jié)合物相和成分分析結(jié)果，闡明了模擬拜耳法溶出條件下含硫脫硅產(chǎn)物(S-DSP)的形成和轉(zhuǎn)化機(jī)制。結(jié)果表明：不同含硫離子參與形成的S-DSP中硫含量和脫硫率由大到小的順序?yàn)?、 、 、S2-，且 和 能夠顯著促進(jìn)方鈉石向鈣霞石的轉(zhuǎn)化。S-DSP中硫含量與鈣霞石含量線性相關(guān)，即含硫離子嵌入過程發(fā)生在含硅物相溶解、成核、長(zhǎng)大過程中。當(dāng)溶液初始 含量為2.4 g/L、w(S)/w(SiO2)=0.13時(shí)，S-DSP可以脫除鋁酸鈉溶液中63%的硫。
關(guān)鍵字: 高硫鋁土礦；含硫離子；方鈉石；鈣霞石；拜耳法
（1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. Powder Metallurgy Research Institute, Central South University, Changsha, 410083, China）
Abstract:The formation and transformation mechanisms of sulfur-containing desiliconization products (S-DSP) were studied under simulated Bayer digestion conditions by analyzing the phase and composition changes. The results show that the sulfur content and desulfurization rate of S-DSP decrease following the order of , , and S2-. Meanwhile, and markedly promote the transformation of sodalite to cancrinite. The sulfur content in S-DSP is linearly correlated with the cancrinite transformation rate, indicating that the S-DSP forms through a nucleation and growth process. 63% of the total sulfur is removed from a simulated -bearing Bayer liquor (ρ0(S)=2.4 g/L, w(S)/w(SiO2)=0.13) by incorporating sulfur-bearing ions into desiliconization products. This progress provides a theoretical basis for the treatment of high-sulfur bauxite by lime-free Bayer digestion process.
Key words: Bayer process; high-sulfur bauxite; sulfur-containing ion; sodalite; cancrinite
