(1. 東北大學(xué) 材料與冶金學(xué)院，沈陽 110004；
2. 黑龍江公安警官職業(yè)學(xué)院 刑事科學(xué)技術(shù)系，哈爾濱 150025)
摘 要: 采用熔融NaOH分解Mg2SiO4 和MgNiSiO4，采用拉曼光譜對(duì)堿熔融過程進(jìn)行在線檢測(cè)，利用X射線衍射儀和紅外光譜儀等分析堿融后的水浸渣，研究硅酸鹽在熔融堿中的分解機(jī)理。結(jié)果表明：NaOH對(duì)Mg2SiO4中Mg離子的釋放是逐次進(jìn)行的，其中間產(chǎn)物為Na2MgSiO4；MgNiSiO4在堿熔融分解過程中，Ni離子優(yōu)先于Mg離子從硅酸鹽陣列中釋放；鎂和鎳橄欖石型硅酸鹽中的Mg-O和Ni-O最終都可以被Na-O替換，生成Na4SiO4。
關(guān)鍵字: Mg2SiO4；MgNiSiO4；堿熔融；反應(yīng)機(jī)理
magnesium nickel silicate by alkali fusion using NaOH
（1. School of Materials Science and Metallurgy, Northeastern University, Shenyang 110004 China;
2. Department of Criminal Science and Technology, Heilongjiang Police Officer Vocational College,
Harbin 150025, China）
Abstract:The decomposition of forsterite and magnesium-nickel silicate was undertaken by alkali fusion using NaOH at elevated temperatures. Raman spectra were measured for the reactions between the silicates and sodium hydroxide in-situ during the alkali fusion process. Meanwhile, the water-leaching residue of the fusion products was characterized by X-ray diffractometry and infrared spectroscopy. The results show that the magnesium ions in Mg2SiO4 can be liberated from the silica arrays successively by aggression of sodium hydroxide, giving rise to Na2MgSiO4 as an intermediate; whereas nickel ions seem to be released much easier from the arrays of MgNiSiO4 than magnesium ions, and move out from their array sites prior to magnesium ions. The bindings between Mg-O and Ni-O in their silicates can be substituted by Na-O completely, and Na4SiO4 is one of the final products for the alkali fusion process.
Key words: Mg2SiO4; MgNiSiO4; alkali fusion; reaction mechanism
