Study on phase diagram of the Na^+, NH~4^+/Cl^-, SO~4^2-, H~2O system at 100℃- the fundamental of utilization of NaHCO~3 mother liquid of natural soda brines by ammoniation-carbonation process

Acta Chimica Sinica ›› 1994, Vol. 52 ›› Issue (7): 634-638. Previous Articles Next Articles

Original Articles

100℃Na^+, NH~4^+/Cl^-, SO~4^2-, H~2O 体系相图-天然盐碱卤加氨碳酸化制碱母液利用的相图研究

张明玖;吕秉玲

大连理工大学化工学院

发布日期:1994-07-15

Study on phase diagram of the Na^+, NH~4^+/Cl^-, SO~4^2-, H~2O system at 100℃- the fundamental of utilization of NaHCO~3 mother liquid of natural soda brines by ammoniation-carbonation process

ZHANG MINGJIU;LU BINGLING

Published:1994-07-15

Abstract

The natural soda lakes in Jilin province and Inner Mongolia Autonomous region and the upper stratum of trona deposits in Henan province are composed mainly of NaHCO3, Na2CO3, NaCl and Na2SO4. After ammoniation and carbonation of their brines, a large proportion of Na2SO4, NaCl, and Na2CO3 are converted to NaHCO3 and precipitated out. For the purpose of optimizing separation process of NH4Cl and Na2SO4 from the distilled NaHCO3 mother liquor, the phase diagram of Na+, NH4+/Cl-, SO42-, H2O system at 100?was studied. It is observed that NaNH4SO4.2H2O (lecontite) can be formed at this temperature Therefore, the conclusion drawn by Dawson and Rivett that NaNH4SO4.2H2O cannot ppt. at >59.3?is incorrect.

Key words: SODIUM CARBONATE, DOUBLE SALTS, SODIUM CHLORIDE, AMMONIUM SULFATE, AMMONIUM CHLORIDE, SODIUM SULFATE, SODIUM SULFATE, SODIUM BICARBONATE, PHASE DIAGRAM, SULFATE MINERALS

CLC Number:

O642
P57

Cite this article

ZHANG MINGJIU;LU BINGLING. Study on phase diagram of the Na^+, NH~4^+/Cl^-, SO~4^2-, H~2O system at 100℃- the fundamental of utilization of NaHCO~3 mother liquid of natural soda brines by ammoniation-carbonation process[J]. Acta Chimica Sinica, 1994, 52(7): 634-638.

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100℃Na^+, NH~4^+/Cl^-, SO~4^2-, H~2O 体系相图-天然盐碱卤加氨碳酸化制碱母液利用的相图研究

Study on phase diagram of the Na^+, NH~4^+/Cl^-, SO~4^2-, H~2O system at 100℃- the fundamental of utilization of NaHCO~3 mother liquid of natural soda brines by ammoniation-carbonation process

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