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本文研究了我国8种主要膨润土的表面性质。研究结果表明,8种膨润土的比表面值为465—676m~2/g,表面负电荷量为45.6—66.5meq/100g。膨润土的比表面和表面负电荷量与其蒙脱石含量呈显著正相关,相关系数分别为0.874~(**)和0.968~(**)两种钙钠质膨润土在焙烧温度400℃时,钙质仇山膨润土负电荷量降低约40%,而钠质平山膨润土无明显变化;后者只在500—600℃时才表现出明显的降低。这说明,膨润土比表面和表面负电荷量主要由其所含的矿物类型决定的。而它们的耐用性则主要取决于其表面吸附的离子类型,钠质膨润土的耐用性高于钙质膨润土。
This paper studied the surface properties of eight main bentonites in China. The results show that the specific surface area of the eight bentonites is 465-676m 2 / g, and the negative surface charge is 45.6-66.5meq / 100g. The specific surface area and surface negative charge of bentonite were positively correlated with the content of montmorillonite. The correlation coefficients were 0.874 ~ (**) and 0.968 ~ (**), respectively. Calcined at calcination temperature of 400 ℃ The negative charge of Beethoochsen bentonite decreased by about 40%, while the sodium bentonite did not change significantly; the latter only showed a significant decrease at 500-600 ℃. This shows that the specific surface area and surface negative charge of bentonite is mainly determined by the type of minerals it contains. Their durability is mainly determined by the type of ions adsorbed on their surface, which is more durable than calcium bentonite.