dissolution

Mass Transfer during Boric Acid Dissolution

The process of mass transfer during the dissolution of boric acid spheres in water was investigated in the temperature range from 293 K to 323 K, and at stirring rotation rates from 1.67 to 6.67 s-1. The study aimed to determine the dependence of the dissolution rate on the stirring rotation rate and water temperature. The analysis of the experimentally obtained results revealed that the most significant factor affecting the intensification of the dissolution process is an increase in the solution temperature.

THE MASS TRANSFER DURING THE DISSOLUTION OF BORIC ACID IN WATER INTENSIFIED BY MECHANICAL STIRRING

The kinetics granules of boric acid (GBA) dissolution were investigated based on the solution temperature and stirring frequency. Experimental mass transfer coefficients were determined and compared with theoretical values. The results indicate that increasing the stirring frequency and the solvent temperature increases the mass transfer coefficient. A computational relationship was derived, enabling the prediction of GBA dissolution based on solution temperature and stirring frequency.

Kinetic Model for Dissolution of Cement Copper in Sulfuric Acid Solutions Containing Cupric Ions

In this paper, the dissolution kinetics of cement copper powder in sulfuric acid solutions containing cupric ions was examined. It was observed that the dissolution rate of copper increased with increasing the acid concentration, temperature, and stirring speed. It was determined that the dissolution rate of copper enhanced with increasing the cupric ion concentration up to 0.025 M. It was found that the temperature and concentration of cupric ion had more considerable effects on the dissolution of copper powder.

Kinetic Regularities and Mathematical Modelling of Potassium Chloride Dissolution

The dissolution process of potassium chloride particles in the apparatus with two-blade mechanical stirrer was investigated and the mass transfer coefficient was determined. The experimental results were generalized by criterion dependence. The independence of the mass transfer coefficient from the solid particles diameter was confirmed. A countercurrent process of potassium salt dissolution in two apparatuses with a mechanical stirring was considered. A mathematical model for countercurrent dissolution was developed and the efficiency of this process was determined.

STUDY OF THE PROPERTIES OF ANP FERTILIZER ENCAPSULATED WITH THE USE OF MODIFIED WASTE OF PET

The experimental investigation of the solubility of the prolonged-action nitroamophos obtained with the use of modified polyethylene terephthalate (PET) waste is presented. The kinetic coefficients of the diffusion process of the substances inside the shell are determined. The possibility of applying a theoretical model to predict the agro-ecological properties of encapsulated ammonium nitrate phosphate is demonstrated.

 

Technological and Economic Estimation of Acid Dissolution of Langbeinite Concentrate with Processing the Obtained Solutions in the Fertilizer

The technological and economic evaluation of two processes of langbeinite concentrate processing in a conditioned fertilizer was carried out with using mineral acids (nitric and phosphatic acid) for its dissolution. The first process allows to obtain non-chloride fertilizer (potassium-magnesium), and the second one allows to obtain not only potassium-magnesium, but such complex nitrogen-phosphorus fertilizer as diammophos.

Analysis of Dissolution Kinetics based on the Local Isotropic Turbulence Theory

The dissolution kinetics of potassium sulfate dissolved in water under pneumatic mixing has been investigated. The mass transfer coefficients were determined by the experiments, as well as on the basis of the local isotropic turbulence theory. The ratio between theoretical and experimental data was found to be satisfying that allows to determine the theoretical mass transfer coefficient to calculate the mentioned process.