摘要:
通过批量试验和水平砂柱试验,以NaCl与CaCl2的混合溶液为研究对象,对Ca2+含量影响微粒释放的过程进行了研究,并提出了在不同浓度Ca2+存在情况下,混合溶液引起微粒释放的临界离子强度。研究结果表明:Ca2+不但不能引起微粒释放,而且对微粒释放过程具有明显而强烈的抑制作用,导致混合溶液引起微粒释放的浓度值急剧下降;Ca2+摩尔百分数为5%时,对应微粒释放的临界离子强度为0.02mol/L;Ca2+摩尔百分数为10%与20%时,对应微粒释放的临界离子强度分别为0.007mol/L与0.0005mol/L;Ca2+摩尔百分数为100%时,无微粒释放现象发生。上述临界离子强度值都远低于单一NaCl溶液引起微粒释放的临界盐浓度值0.06±0.005mol/L,且混合溶液中Ca2+含量越高,发生微粒释放的临界离子强度值越低,这一现象进一步验证了Ca2+对微粒释放的抑制作用。
Abstract:
With the batch and level sand column experiments,and with the study object of NaCl and CaCl2 mixed solution,the particle release process influenced by Ca2+ contents was examined in this paper.The critical total ionic strength（CTIS） values were brought forward under different Ca2+contents.The research results indicate that the Ca2+ not only cannot result in particle release, but also restrain the release process obviously and intensively,and the existence of the Ca2+ will result in the descending of the concentration values which induces particle release.When the Ca2+ contents were 5%,10% and 20%,the corresponding CTISs were 0.02,0.007 and 0.0005mol/L,respectively.There was not particle release when the content of Ca2+ was 100%.All the above CTISs were much lower than that of the single NaCl solution of 0.06±0.005mol/L.The CTISs become lower with the increasing Ca2+content,which validates the restraining effect of the Ca2+ on the particle release.
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