Effect of Mg2+Ions on the Nucleation Kinetics of Calcium Sulfate in Concentrated Calcium Chloride Solutions

2010 ◽  
Vol 49 (12) ◽  
pp. 5569-5574 ◽  
Author(s):  
Baohong Guan ◽  
Liuchun Yang ◽  
Zhongbiao Wu
Keyword(s):  
Calcium Chloride ◽  
Calcium Sulfate ◽  
Nucleation Kinetics ◽  
Chloride Solutions ◽  
Kinetics Of

scholarly journals Obtaining artificial carnallites from magnesium chloride brines

2020 ◽  
Vol 56 (2) ◽  
pp. 229-234
Author(s):  
V. V. Shevchuk ◽  
T. N. Potkina ◽  
A. I. Vaitenka ◽  
O. V. Smetanina
Keyword(s):  
Calcium Chloride ◽  
Magnesium Chloride ◽  
Calcium Sulfate ◽  
Raw Materials ◽  
Potassium Sulfate ◽  
Sulfate Ions ◽  
Chloride Solutions ◽  
Excess Concentration ◽  
Almost All ◽  
Complete Precipitation

The excess of magnesium chloride brines is formed during the polymineral ores processing in order to obtain potassium sulfate. One way to regenerate such brines is to produce artificial carnallite. It is necessary to purify these brines from sulfates for their further use as raw materials for the artificial carnallite production. In this work, the process of desulfurization of magnesium chloride brines with a solution of calcium chloride is studied. The temperature and the processing time, the magnesium chloride solutions concentration and the consumption of desulfurizing agent (calcium chloride) influence on the degree of magnesium chloride solutions purification from sulfate ions was determined. It has been established that almost all sulfate ions interact with calcium ion in 15 minutes and the desulfurization degree reaches 98,08 %. The increase in duration of the suspension mixing is necessary in order to establish equilibrium in the system and relieve the supersaturation in the solution. It has been shown that with increasing solutions saturation with MgCl2, the degree of the magnesium chloride brines purification from SO4 2– ion increases. Complete precipitation of calcium sulfate requires a certain excess concentration of calcium chloride.

Leaching kinetics of lead from lead (II) sulphate in aqueous calcium chloride and magnesium chloride solutions

1997 ◽  
Vol 47 (1) ◽  
pp. 137-147 ◽  
Author(s):  
Dragan Sinadinović ◽  
Željko Kamberović ◽  
Aleksandar Šutić
Keyword(s):  
Calcium Chloride ◽  
Magnesium Chloride ◽  
Leaching Kinetics ◽  
Chloride Solutions ◽  
Kinetics Of

KINETICS OF CALCIUM ION ABSORPTION INTO CARROT TISSUE DURING IMMERSION IN CALCIUM CHLORIDE SOLUTIONS

2003 ◽  
Vol 27 (2) ◽  
pp. 75-85 ◽  
Author(s):  
A. QUINTERO-RAMOS ◽  
M. C. BOURNE ◽  
J. BARNARD ◽  
A. ANZALDÚA-MORALES ◽  
R. GONZÁLEZ-LAREDO ◽  
...  
Keyword(s):  
Calcium Chloride ◽  
Calcium Ion ◽  
Chloride Solutions ◽  
Ion Absorption ◽  
Kinetics Of

Novel attempts for the synthesis of calcium sulfate hydrates in calcium chloride solutions under atmospheric conditions

2012 ◽  
Vol 38 (1) ◽  
pp. 381-387 ◽  
Author(s):  
Jen-Chang Yang ◽  
Hong-Da Wu ◽  
Nai-Chia Teng ◽  
Dian-Yu Ji ◽  
Sheng-Yang Lee
Keyword(s):  
Calcium Chloride ◽  
Calcium Sulfate ◽  
Atmospheric Conditions ◽  
Chloride Solutions

Quantitative Evaluation of Calcium Sulfate Precipitation Kinetics in the Presence and Absence of Scale Inhibitors

SPE Journal ◽  
2010 ◽  
Vol 15 (04) ◽  
pp. 977-988 ◽  
Author(s):  
Chunfang Fan ◽  
Amy T Kan ◽  
Gongmin Fu ◽  
Mason B Tomson ◽  
Dong Shen
Keyword(s):  
Calcium Sulfate ◽  
Saturation Index ◽  
Precipitation Kinetics ◽  
X Ray Diffraction ◽  
Nucleation Kinetics ◽  
X Ray ◽  
Calcium Sulfate Scale ◽  
Temperature Ranges ◽  
Presence And Absence ◽  
Kinetics Of

Summary In this study, the nucleation kinetics of calcium sulfate scale formation in the presence and absence of scale inhibitors has been studied. The nucleation kinetics of calcium sulfates in 0–3.2 M NaCl solution was measured from 0 to 200°C at various supersaturation conditions [saturation index (SI) = 0–1.3]. The phase behavior of these various calcium sulfate phases was monitored by X-ray diffraction (XRD). The inhibition study was performed by evaluating the inhibition efficiency of calcium sulfate precipitation at the same supersaturation and temperature ranges as those of the nucleation study. Several polyphosphonate, polymeric, and environmentally friendly inhibitors were found to be effective inhibitors. The study has shown that calcium sulfate scales are very difficult to inhibit at SI > 1. Calcium sulfate scale is inhibited most effectively by hexamethylenediamine tetra(methylene phosphonic acid) (HDTMP) if the saturation index is less than approximately 1.0. In addition, a semiquantitative model to predict precipitation kinetics of calcium sulfate as a function of temperature, pH, SI, and HDTMP concentration is established with experimental results from this study. The effect of methanol and methylene glycol (MEG) on calcium sulfate precipitation kinetics and inhibition is also presented.

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