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Phase Diagram of the Quaternary System KCl–MgCl2–NH4Cl–H2O at t = 60.00 °C and Their Application

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Abstract

Based on the requirement for the comprehensive exploitation and utilization of the salt lake resources magnesium chloride and potassium chloride, a new technology to produce KCl and ammonium carnallite (NH4Cl·MgCl2·6H2O) by using NH4Cl as salting-out agent to separate carnallite is proposed. The solubilities of quaternary system KCl–MgCl2–NH4Cl–H2O were measured by the isothermal method at t = 60.00 °C and the corresponding phase diagram was plotted and analyzed. The analysis of this phase diagram shows that there are seven saturation points and eight regions of crystallization. These eight regions of crystallization represent salts corresponding to KCl, NH4Cl, MgCl2·6H2O, (K1−n (NH4) n )Cl, ((NH4) n K1−n )Cl, (K1−n (NH4) n )Cl·MgCl2·6H2O, KCl·MgCl2·6H2O and NH4Cl·MgCl2·6H2O. According to the phase diagram analysis and calculations, ammonium carnallite (NH4Cl·MgCl2·6H2O) and KCl can be obtained using carnallite as raw materials and ammonium chloride as salting-out agent at t = 60.00 °C. The new technology shows the advantages of being easy to operate and having low energy consumption. The research on this quaternary phase diagram is the foundation for reasonable development of carnallite resources and comprehensive utilization of the salt lake brines.

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References

  1. Liu, J.-L., Zhang, Y.-K.: Preparation techniques and development trend of anhydrous magnesium chloride. J. Inorg. Chem. Ind. 39, 10–12 (2007)

    CAS  Google Scholar 

  2. Zhou, H., Yuan, J.-J.: Progress in preparation technology of high purity anhydrous magnesium chloride. J. Process Eng. 4, 276–281 (2004)

    CAS  Google Scholar 

  3. Liang, B., Liang, Y.-T., Lu, H.-M.: Comprehensive development and utilization of Qinghai salt lake resources and dynamic equilibrium. J. Min. Metall. 10, 65–70 (2001)

    CAS  Google Scholar 

  4. Zhang, J.-W.: Discussion Chaerhan salt lake resources comprehensive utilization. Qinghai Sci. Technol. 4, 123–124 (2009)

    Google Scholar 

  5. Zhou, Y., Li, L.J., Wu, Z.J., Li, X.: Exploitation and comprehensive utilization for Qinghai salt lakes. Prog. Chem. Beijing 25, 1613–1624 (2013)

    CAS  Google Scholar 

  6. Zheng, M.-P., Xiang, R.-J., Ge, Z.-H.: The sustainable development of potassium, magnesium, lithium, boron mineral resources in our country. Land Resour. Inf. 3, 27–32 (2004)

    Google Scholar 

  7. Zhang, Z.-X., Zeng, Y., Yu, X.-D.: Stable phase equilibrium in aqueous ternary system MgCl2 + NH4Cl + H2O at 298.15 K. J. Chem. Eng. 40, 38–42 (2012)

    Google Scholar 

  8. Biltz, W., Marcus, E.: Über Ammoniumcarnallit. Z. Anorg. Chem. 71, 166–181 (1911)

    Article  CAS  Google Scholar 

  9. Dou, S.-Y., Zhao, B., Cao, J.-L.: Phase diagrams of the quaternary Mg2+, NH4 +//Cl−, SO 2–4 H2O system at 25 °C and their application. Fluid Phase Equilib. 385, 54–61 (2015)

    Article  CAS  Google Scholar 

  10. Dou, S.Y., Zhao, B., Li, L., Xue, C.Y., Gong, X.M.: Cao, J.L: Phase diagram of Mg2+, NH4 +//Cl−, SO 2–4 H2O system at 0 °C and their application. Fluid Phase Equilib. 409, 264–270 (2016)

    Article  CAS  Google Scholar 

  11. Dou, S.Y., Guo, H.F., Zhao, B., Xue, C.Y., Cao, J.L.: Phase diagrams of the quaternary system NaCl–MgCl2–NH4Cl in water at 0 and 25 °C and their Application. J. Chem. Eng. Data 61, 450–457 (2016)

    Article  CAS  Google Scholar 

  12. Gong, C.Z., Wang, S.Z., Ding, L., Li, G.M., Xia, J.L.: Improvement on main content determ ination method in industrial magnesium sulfate standard. J. Inorg. Chem. Ind. 41, 61–62 (2009)

    Google Scholar 

  13. Department of Chemistry, Zhejiang University. Analytical Chemistry Experiment. Higher Educ. Press: Beijing (2003)

  14. Li, J.-T., Cui, Q., Li, F.-M.: Comparison of determination method of sulfate radical in Glauber salt production. Ch. Chlor-Alkali 7, 33–35 (2008)

    Google Scholar 

  15. Li, Y.-G.: Metallic Solvent Extraction Thermodynamic. Tsinghua University Press, Beijing (1988) Chap. 1

  16. Yang, S.: Determination of chlorion in water by silver measuring method. S Electr. Power. Technol. 15, 311–316 (1996)

    Google Scholar 

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Funding

The financial support was received from the National Natural Science Foundation of China (No. 21576066).

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Authors and Affiliations

  1. Hebei Provincial Key Lab of Green Chemical Technology and High Efficient Energy Saving, College of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, 300130, China

    Jing-Xue Wu, Guo-Cheng Zhang, Bin Zhao, Shuo Wang & Ji-Lin Cao

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  1. Jing-Xue Wu
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  2. Guo-Cheng Zhang
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  3. Bin Zhao
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  4. Shuo Wang
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  5. Ji-Lin Cao
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Correspondence to Ji-Lin Cao.

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Wu, JX., Zhang, GC., Zhao, B. et al. Phase Diagram of the Quaternary System KCl–MgCl2–NH4Cl–H2O at t = 60.00 °C and Their Application. J Solution Chem 46, 58–69 (2017). https://doi.org/10.1007/s10953-016-0558-7

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  • DOI: https://doi.org/10.1007/s10953-016-0558-7

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