This paper presents the results of experiments on the physicochemical conditions for the formation of picaromerite in the five-component brine system K-Na-Mg-Cl-SO4-H2O and the process of isothermal evaporation-crysta...This paper presents the results of experiments on the physicochemical conditions for the formation of picaromerite in the five-component brine system K-Na-Mg-Cl-SO4-H2O and the process of isothermal evaporation-crystallization of picromerite from brines.The metastable phase fields of picromerite at 15,10 and 5℃and its stable equilibrium phase field at -5℃ have been established.In addition,the phase equilibrium relationships have also been established for other salt minerals.The lower limit of formation temperature of picromerite has been deduced on the basis of experi-mental results.The isothermal evaporation crystallization path of the invariant assemblage(point D) of picromerite,epsomite,sylvite and halite at 25,15,10 and 5℃ has been revealed.Furthermore,some controversial problems are approached concerning the 25℃“solar” diagram and the 25℃ metastable phase diagram of this system.展开更多
Hydroglauberite, a mineral first identified and termed in 1969 by M. H. , is also encountered in many places such as Qinghai and Xizang in China and has been studied. 1. Hydroglauberite Field in a Six-Component System...Hydroglauberite, a mineral first identified and termed in 1969 by M. H. , is also encountered in many places such as Qinghai and Xizang in China and has been studied. 1. Hydroglauberite Field in a Six-Component System K, Na, Mg, Ca, Cl,展开更多
Ⅰ. INTRODUCTION The experimental data on the precipitation of Ca-bearing minerals in a system K, Na, Mg, Ca, Cl, SO4-H2O are notably lacking, owing to the extremely slow velocity of reaction in the course of the expe...Ⅰ. INTRODUCTION The experimental data on the precipitation of Ca-bearing minerals in a system K, Na, Mg, Ca, Cl, SO4-H2O are notably lacking, owing to the extremely slow velocity of reaction in the course of the experiment, though Van’t Hoff and D’ans once roughly outlined the phase fields of minerals on the triangular projection K2-Mg-SO4 and Baliashko, Autenrieth and Han Weitian attempted the studies on the formation of polyhalite in the Mg-rich area of the same projection.展开更多
Polyhalite （K2SO4·MgSO4·2CaSO4·2H2O） is one of the widely distributed potash minerals. It is found in nearly all potash deposits of the sulphate type in Sichuan, Hubei and Shandong provinces. The stud...Polyhalite （K2SO4·MgSO4·2CaSO4·2H2O） is one of the widely distributed potash minerals. It is found in nearly all potash deposits of the sulphate type in Sichuan, Hubei and Shandong provinces. The study on the formative conditions of polyhalite and the interrelation between polyhalite and soluble potash minerals becomes important for the present mineral exploration.展开更多
As the thickness of the overburden increases, the temperature of the evaporites gradually rises, and the primary hydrous minerals tend to dihydrate and incongruently melt to form new mineral assemblages. This process ...As the thickness of the overburden increases, the temperature of the evaporites gradually rises, and the primary hydrous minerals tend to dihydrate and incongruently melt to form new mineral assemblages. This process can be called geothermal metamorphism and can be clarified by polythermal diagram of stable equilibrium. When we studied the geothermal metamorphism of some salt paragenesis in China, we展开更多
文摘This paper presents the results of experiments on the physicochemical conditions for the formation of picaromerite in the five-component brine system K-Na-Mg-Cl-SO4-H2O and the process of isothermal evaporation-crystallization of picromerite from brines.The metastable phase fields of picromerite at 15,10 and 5℃and its stable equilibrium phase field at -5℃ have been established.In addition,the phase equilibrium relationships have also been established for other salt minerals.The lower limit of formation temperature of picromerite has been deduced on the basis of experi-mental results.The isothermal evaporation crystallization path of the invariant assemblage(point D) of picromerite,epsomite,sylvite and halite at 25,15,10 and 5℃ has been revealed.Furthermore,some controversial problems are approached concerning the 25℃“solar” diagram and the 25℃ metastable phase diagram of this system.
文摘Hydroglauberite, a mineral first identified and termed in 1969 by M. H. , is also encountered in many places such as Qinghai and Xizang in China and has been studied. 1. Hydroglauberite Field in a Six-Component System K, Na, Mg, Ca, Cl,
文摘Ⅰ. INTRODUCTION The experimental data on the precipitation of Ca-bearing minerals in a system K, Na, Mg, Ca, Cl, SO4-H2O are notably lacking, owing to the extremely slow velocity of reaction in the course of the experiment, though Van’t Hoff and D’ans once roughly outlined the phase fields of minerals on the triangular projection K2-Mg-SO4 and Baliashko, Autenrieth and Han Weitian attempted the studies on the formation of polyhalite in the Mg-rich area of the same projection.
文摘Polyhalite （K2SO4·MgSO4·2CaSO4·2H2O） is one of the widely distributed potash minerals. It is found in nearly all potash deposits of the sulphate type in Sichuan, Hubei and Shandong provinces. The study on the formative conditions of polyhalite and the interrelation between polyhalite and soluble potash minerals becomes important for the present mineral exploration.
文摘As the thickness of the overburden increases, the temperature of the evaporites gradually rises, and the primary hydrous minerals tend to dihydrate and incongruently melt to form new mineral assemblages. This process can be called geothermal metamorphism and can be clarified by polythermal diagram of stable equilibrium. When we studied the geothermal metamorphism of some salt paragenesis in China, we
