共查询到19条相似文献,搜索用时 78 毫秒
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高岭土和煅烧高岭土的微观结构研究 总被引:2,自引:0,他引:2
采用XRF、SEM、XRD、NMR、TEM等测试手段对苏州和茂名高岭土及其650℃煅烧产物进行了研究。实验结果表明:煅烧产物由煅烧前的晶态转变成了非晶态,Al由六配位转变为四、五、六配位共存,煅烧前高岭土结构致密,煅烧后产物结构变得疏松。 相似文献
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煅烧高岭土的火山灰活性 总被引:13,自引:1,他引:12
用现代测试方法研究了高岭石的热稳定性及经不同温度煅烧产物的系统特征 ,探讨了其结构变化与火山灰活性的关系。结果表明 ,煅烧温度为 6 76℃的高岭土具有最佳的火山灰活性 相似文献
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对不同粒度煤系高岭土进行了煅烧试验研究,并探讨了煤系高岭土的煅烧机理,从实践上证明了利用煤系高岭土生产造纸涂料用优质高岭土的可行性,为开发煤系高岭土进行了有益探讨。 相似文献
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凹凸棒石粘土具有吸附性、载体性、阳离子交换能力、流变性、催化性等物化性质。同时,酸、热、提纯和有机改性等处理方式会对凹凸棒石粘土物化性质产生影响,能显著改善和提高凹凸棒石粘土的物化性质。其中,酸改变其带电性、吸附活性、阳离子交换容量和比表面积;随着温度的升高,热处理使其比表面积不断提高到最大值再急剧下降;提纯可以改善胶体性能;有机改性可以使粘土颗粒表面由完全的亲水性转变为部分疏水性,改变比表面积和阳离子交换容量,增强胶体悬浮性能。 相似文献
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Cathy M. Lenter Louis M. McDonald Jr. Jeffrey G. Skousen Paul F. Ziemkiewicz 《Mine Water and the Environment》2002,21(3):114-120
It is important to consider floc properties when designing acid mine drainage treatment (AMD) systems. Relatively few studies
have evaluated the effects of neutralizing base, neutralization pH, and sulfate in solution on floc properties in active treatment
systems. We used NaOH and NH4OH as neutralizing bases, 0:1, 2.5:1, and 5:1 SO4:Fe molar ratios, and neutralization pH of 7, 8, and 9 in laboratory studies. Neutralizing cation, sulfate content, and neutralization
pH had significant effects on floc mass and volume, but SO4:Fe ratio was the most important parameter. Settled floc volumes were slightly larger in the sodium system. Floc mass and
volume both decreased with increasing pH. Floc generated in the presence of sulfate required significantly more time to reach
a total suspended solids discharge limit of 70 mg L−1, had slower initial settling rates, and smaller settled volumes than floc generated without sulfate. The systems we studied
were less complicated than actual AMD, but understanding the effects of sulfate, neutralizing cation, and neutralization pH
on floc properties may help to design more efficient treatment systems. Choosing the appropriate treatment chemical and designing
adquate pond sizes will ultimately increase treatment efficiency and improve stream water quality. 相似文献
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