THE INFLUENCE OF ELECTROLYTE CONCENTRATION ON FLOCCULATION OF CLAY SUSPENSIONS
THE INFLUENCE OF ELECTROLYTE CONCENTRATION ON FLOCCULATION OF CLAY SUSPENSIONS
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DOI：
10.1097/00010694-197903000-00002
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发表时间：
1979-03
期刊：
影响因子：
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通讯作者：
H. Arora;N. T. Coleman
中科院分区：
文献类型：
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作者：
H. Arora;N. T. Coleman
矿物组成、饱和离子和电解质浓度对各种粘土矿物絮凝和分散行为的影响被用来解释在许多含少量或不含可膨胀粘土矿物的钠质土壤中观察到的水力导电性降低。钠饱和粘土矿物对NaHCO3絮凝的敏感性由大到小依次为伊利石、蛭石、蒙脱石、高岭石。上述粘土的临界盐浓度（CSC）分别为185、58、28 ~ 60和8 me/l。絮凝钙或镁饱和粘土所需的CaCl2或MgCl2浓度非常低，约为1毫克/升或更低。在钠吸附比为15时，CSCs的钠吸附比CaCl2或MgCl2大几倍。少量蒙脱石可能沉积在高岭石带正电的边缘，这是高岭石CSC值大幅增加的原因。从四种加利福尼亚土壤中提取的土壤粘土的絮凝行为受其矿物组成的影响，与参考粘土矿物的模式相似。
The influence of mineralogical composition, saturating ions, and electrolyte concentration on the flocculation and dispersion behavior of various clay minerals was used to explain reductions in the hydraulic conductivity observed in many sodic soils containing little or no expandable clay minerals. Sodium-saturated clay minerals were found to differ in their sensitivity to flocculation by NaHCO3 in the decreasing order: illite, vermiculite, smectite, and kaolinite. Critical salt concentrations (CSC) were 185, 58, 28 to 60, and 8 me/liter, respectively, for the above clays. Very low concentrations of CaCl2 or MgCl2, on the order of 1 me/liter or less, were required to flocculate Ca- or Mg-saturated clays. At a sodium adsorption ratio of 15, CSCs were several times greater than those for CaCl2 or MgCl2. A small amount of smectite, possibly deposited on positively charged edges of kaolinite, was responsible for large increases in CSC values of kaolinite. The flocculation behavior of soil clays extracted from four California soils was influenced by their mineralogical composition, similar to the patterns observed for reference clay minerals.