研究硫化铁沉淀动力学，溶解度和相变的新方法,Industrial & Engineering Chemistry Research

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研究硫化铁沉淀动力学，溶解度和相变的新方法
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2017-07-25 00:00:00 , DOI: 10.1021/acs.iecr.7b01615
Ya Liu ₁ , Zhang Zhang ₁ , Narayan Bhandari ₁ , Zhaoyi Dai ₁ , Fei Yan ₁ , Gedeng Ruan ₁ , Alex Y. Lu ₁ , Guannan Deng ₁ , Fangfu Zhang ₁ , Hamad Al-Saiari ₁ , Amy T. Kan ₁ , Mason B. Tomson ₁

Affiliation

已经开发了可靠的缺氧活塞流反应器，以同时研究硫化铁（FeS）的沉淀动力学，溶解度和相变。温度（23–125°C），离子强度（0.00886–5.03 mol / kg）和亚铁[Fe（II）]与硫化物[S（-II）]浓度比（1:20至1： 5）进行了研究。当Fe（II）浓度显着低于S（-II）浓度时，发现FeS沉淀的动力学是关于Fe（II）浓度的拟一级反应。FeS沉淀动力学可以通过高温和高离子强度来加速，但不受测试比率范围内Fe（II）与S（-II）浓度比的影响。通过使用本研究中测得的FeS溶解度数据和来自文献的数据，开发了预测FeS溶解度和沉淀的模型。在≤100°C的温度下，发现新鲜沉淀的FeS是马基诺石。Mackinawite可以在≥50°C的温度下转变为三菱沸石，低离子强度有利于相变。而且，由钢腐蚀形成的马氏体似乎比由沉淀形成的马氏体更容易转变为三方沸石。这项研究为硫化铁的研究提供了一种新方法，并为工业中FeS的预测和控制提供了有价值的FeS热力学和动力学数据。

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New Approach to Study Iron Sulfide Precipitation Kinetics, Solubility, and Phase Transformation

A reliable anoxic plug flow reactor has been developed to study iron sulfide (FeS) precipitation kinetics, solubility, and phase transformation simultaneously. The effects of temperature (23–125 °C), ionic strength (0.00886–5.03 mol/kg), and ferrous iron [Fe(II)] to sulfide [S(-II)] concentration ratio (1:20 to 1:5) were studied. The kinetics of FeS precipitation was found to be a pseudo-first-order reaction with respect to Fe(II) concentration, when Fe(II) concentration is significantly lower than the S(-II) concentration. FeS precipitation kinetics can be accelerated by high temperature and high ionic strength but not be affected by the Fe(II) to S(-II) concentration ratio at the tested ratio range. A model for predicting FeS solubility and precipitation was developed by using FeS solubility data measured in this study and data from literature. At a temperature ≤100 °C, freshly precipitated FeS was found to be mackinawite. Mackinawite can transform to troilite at a temperature ≥50 °C, and low ionic strength favors the phase transformation. Also, mackinawite formed from steel corrosion seems to be easier to transform to troilite than the mackinawite formed from precipitation. This study presented a new approach for iron sulfide study and contributed valuable FeS thermodynamics and kinetics data for FeS prediction and control in industry.

更新日期：2017-07-26

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