蛭石精矿的有机改性试验
Experiments on the Organic Modification of Vermiculite Concentrate
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摘要: 采用十六烷基三甲基溴化铵(HDTMAB)对蛭石精矿进行了有机改性,利用X射线衍射法(XRD)、红外光谱(IR)、差示扫描量热法(DSC)和热失重分析(TG)对蛭石精矿和有机改性蛭石进行了表征.实验结果表明,当反应液中蛭石与水的质量比为1∶10、反应温度在60～70 ℃时,HDTMAB的阳离子HDTMA进入绝大部分蛭石晶粒的晶层,将蛭石的晶层间距撑大,蛭石的(001)晶面间距d001从1.459 86 nm增大到3.701 34 nm.HDTMA进入了单晶颗粒之间,将蛭石颗粒分散成单晶颗粒.Abstract: The vermiculite concentrate is organic modified with hexadecyl trimethyl ammonium bromide (HDTMAB) and vermiculite and organovermiculite are characterized by X-ray diffraction spectrometry (XRD), infrared spectrometry (IR), differential scanning calorimetry （DSC） and gravitational thermal analysis (TG). The experimental results show that when the mass ratio of vermiculite to water is 1∶10 in reaction suspension and the reaction temperature is controlled at 60~70℃, HDTMA cations enter the interlayer gap of most vermiculite particle and enlarge the distance between the crystal layers of vermiculite (the distance of the (001) crystal plane of vermiculite increasing from 1.45986 nm to 3.70134 nm). HDTMA cations enter the gap between single crystal particles of vermiculite and separate the vermiculite particles into single crystal particles with nanometer size.
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Key words:
- vermiculite /
- concentrate /
- hexadecyl /
- trimethyl /
- ammonium /
- bromide /
- (HDTMAB) /
- organic /
- modification /
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