Inorganic Chemicals Industry ›› 2025, Vol. 57 ›› Issue (10): 41-48.doi: 10.19964/j.issn.1006-4990.2024-0564

• Research & Development • Previous Articles     Next Articles

Study on indoor evaporation and elemental behaviors of deep brine from Mahai region in Qaidam Basin

SHI Lijie1,2,3(), ZHANG Xiufeng1,2,3(), ZHANG Lizhen1,2,3, YI Yuejun1,2,3, TAN Xiumin1,2,3   

  1. 1. Zhengzhou Institute of Multipurpose Utilization of Mineral Resources,CAGS,Zhengzhou 450006,China
    2. China National Engineering Research Center for Utilization of Industrial Minerals,Zhengzhou 450006,China
    3. Key Laboratory of Polymetallic Ores′ Evaluation and Utilization,NMR,Zhengzhou 450006,China
  • Received:2024-10-25 Online:2025-10-10 Published:2024-12-05
  • Contact: ZHANG Xiufeng E-mail:shilijie@mail.cgs.gov.cn;zh200318@126.com

Abstract:

In order to develop potassium and lithium resources in the deep brine from Mahai region,through the statistics and comprehensively comparison of hydrochemical characteristics of the deep brine and subsurface brine from Mahai region firstly,it was determined that the deep brine of this experiment was in the transition stage from subsurface brine to deep brine.The type of experimental brine was still magnesium sulfate subtype,and its hydrochemical characteristic parameter m(KCl)/m(MgCl2) was so high to 0.519 that it was nearer to the composition point of phase KCl,with prolonged precipitation rate of the sylvinite section.Then,through the indoor evaporation experiment at 15~25 ℃,chemical compositions of stage liquid and solid phase,and XRD patterns analysis,laws including the evaporation route of Mahai deep brine,hydrochemical characteristics,elemental behaviors were determined.The evaporation was divided into three stages:halite,sylvinite and carnallite,potassium was deposited in two phases,KCl and Car,with phase KCl accounting for 61% of total potassium precipitation,and the carnallite section was accompanied by deposition of phase epsomite and phase bischofite.Trace elements such as Li,B,and Br were always concentrated in the form of ions,and the ion concentration had reached more than 0.2 g/L in the bittern.Finally,there was a good match between experimental results and theoretical evaporation calculations,theoretical calculations of the metastable phase diagram 25 ℃ Na+,K+,Mg2+//Cl-,SO42--H2O could be used to guide the actual Mahai deep brine evaporation better.The results provided theoretical support for the exploitation and comprehensive utilization of Mahai deep brine.

Key words: deep brine, hydrochemical characteristics, phase diagram calculations, potash deposit, elemental behaviors, magnesium sulfate subtype

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