Thermodynamics of aqueous magnesium chloride, calcium chloride, and strontium chloride at elevated temperatures

1987 ◽  
Vol 32 (1) ◽  
pp. 76-80 ◽  
Author(s):  
Ramesh C. Phutela ◽  
Kenneth S. Pitzer ◽  
Preet P. S. Saluja
Keyword(s):  
Calcium Chloride ◽  
Magnesium Chloride ◽  
Elevated Temperatures ◽  
Strontium Chloride

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

scholarly journals THE SOLUBILITY AND PROPERTIES OF A PURIFIED ICHTHYOCOL IN SALT SOLUTIONS OF NEUTRAL pH

1957 ◽  
Vol 3 (4) ◽  
pp. 545-557 ◽  
Author(s):  
Paul M. Gallop ◽  
Sam Seifter ◽  
Edward Meilman
Keyword(s):  
Calcium Chloride ◽  
Magnesium Chloride ◽  
Divalent Cations ◽  
Optical Rotation ◽  
Sodium Thiosulfate ◽  
Salt Solutions ◽  
Bacterial Collagenase ◽  
Neutral Ph ◽  
Calcium Magnesium ◽  
Intermediate Concentration

1. Purified citrate-extracted ichthyocol obtained from carp swim bladders has been further characterized with respect to its content of certain amino acids and carbohydrate substances. 2. The degree of solubilization or dispersion of ichthyocol by solutions of certain salts maintained in the range of neutral pH and at a temperature of 0–2°C. has been determined. 3. While a number of salts of monovalent cations had no significant solubilizing effects on ichthyocol, ammonium chloride in a concentration of 1 M did cause solution of the protein. 4. Sodium thiosulfate in a range of concentrations caused the solubilization of ichthyocol but was most effective in an intermediate concentration of 0.25 M. 5. Several salts of divalent cations, in particular the chlorides of calcium, magnesium, and barium, and magnesium thiosulfate in concentrations ranging from 0.3 to 1 M caused the immediate and complete solubilization of the ichthyocol. 6. Solutions of ichthyocol in calcium chloride, magnesium chloride, and sodium thiosulfate buffered or adjusted to pH 7.0, were studied with respect to intrinsic viscosity of the protein, optical rotation, ultracentrifugal sedimentation, and reconstitution into fibers. It was found in each case that the original characteristics of the collagen, as determined previously in acid solution, were maintained when the protein was dissolved in salt solutions of neutral pH. No evidence of denaturation or gelatinization could be found when ichthyocol was solubilized under the stated conditions. 7. Collagen in neutral solution with sodium thiosulfate, calcium chloride, or magnesium chloride was not attacked by trypsin as determined viscometrically at 20.0°C., but was rapidly degraded by a purified bacterial collagenase.

Sign in / Sign up

Export Citation Format

Share Document