首页 > 过刊浏览>2021年第95卷第3期 >1016-1023. DOI:10.1111/1755-6724.14409
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Production of Potash and N-Mg Compound Fertilizer via Mineral Shoenite from Kunteyi Salt Lake: Phase Diagrams of Quaternary System (NH4)2SO4-MgSO4-K2SO4-H2O in the Isothermal Evaporation and Crystallization Process
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Production of Potash and N-Mg Compound Fertilizer via Mineral Shoenite from Kunteyi Salt Lake: Phase Diagrams of Quaternary System (NH4)2SO4-MgSO4-K2SO4-H2O in the Isothermal Evaporation and Crystallization Process
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This project was supported by the National Natural Science Foundation of China (grant No. 21576066), the Natural Science Foundation of Hebei Province, China (No. B2017202268) and the Research Fund Program of Guangdong Provincial Key Lab of Green Chemical Product Technology (No. GC201816). Susan Turner (Brisbane) assisted with English language.

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    Abstract:

    Based on the requirement of the new technology for producing potassium sulfate and N-Mg compound fertilizer, boussingaultite, by the reaction of the mineral shoenite from Kunteyi Salt Lake, Qinghai province, and the industrial by-product ammonium sulfate, the solubilities of the quaternary system (NH4)2SO4-MgSO4-K2SO4-H2O at 25.0oC in the isothermal evaporation and crystallization process were measured using the isothermal evaporation method, and the corresponding phase diagrams were plotted. According to the diagram, this system contains six saturation points and six solid phase fields of crystallization, which correspond to (K1-m,(NH4)m)2SO4, (NH4)2SO4·MgSO4·6H2O, K2SO4·MgSO4·6H2O, MgSO4·6H2O, (K1-n,(NH4)n)2SO4·MgSO4·6H2O and MgSO4·7H2O, respectively. By analyzing and calculating the isothermal evaporation and dissolution phase diagram of this quaternary system at 25.0oC, K2SO4 and (NH4)2SO4·MgSO4·6H2O can be separated via K2SO4·MgSO4·6H2O and (NH4)2SO4 as raw materials. Theoretical calculations about the proposed process were carried out and verified by experiment, which indicated that the yield of potassium sulfate was improved and the magnesium resources were fully utilized.

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LI Cheng, CHEN Xueqing, GUO Hongfei, ZHOU Xue, CAO Jilin.2021. Production of Potash and N-Mg Compound Fertilizer via Mineral Shoenite from Kunteyi Salt Lake: Phase Diagrams of Quaternary System (NH4)2SO4-MgSO4-K2SO4-H2O in the Isothermal Evaporation and Crystallization Process[J]. ACTA GEOLOGICA SINICA(English edition),95(3):1016~1023

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  • 收稿日期:2019-04-19
  • 最后修改日期:2019-09-15
  • 在线发布日期: 2021-06-23
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