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A chemical model,based on Pitzer activity coefficient model,is developed with a speciation approach to describe the solubility and chemistry of nesquehonite in concentrated chloride solutions.The chemical equilibrium constants for nesquehonite and aqueous species,i.e.0 3 MgCO,3 MgHCO,and MgOH +,are precisely calculated as a function of temperature according to the Van’t Hoff equation by use of standard Gibbs free energy,standard formation enthalpy and heat capacity.The most recent solubility data are regressed to obtain new Pitzer parameters with good agreement.The predictive ability of the new model is improved significantly in comparison with previous models.The behavior of speciation chemistry for nesquehonite in various chloride media is explained through this modeling work on the basis of the 2 3 Mg /CO bearing species distribution,activity coefficient and pH changes. 相似文献
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分析了杨村矿2702工作面底板30m和50m两个不同深度界面的音频电透视探测成果,与煤层底板岩层结构及井下探水情况对比研究发现,音频电透视探测的煤层底板综合视电导率高值异常与岩层的裂隙性及其充水程度具有很强的关联性;岩层裂隙发育且与下部含水层连通性良好部位明显显现视电导率高值异常,表明音频电透视探测成果能够综合反映底板岩层的阻水条件。 相似文献
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