Investigation of dissolution kinetics of natural magnesite in gluconic acid solutions (original) (raw)
Related papers
Determination of the optimum conditions for dissolution of magnesite with H2SO4 solutions
Indian Journal of Chemical Technology, 2006
Basic data on leaching of magnesite (MgCO 3 ) with sulphuric acid are of interest from the point of view of the industrial process for obtaining pure MgSO 4 . The Taguchi method was used to determine the optimum conditions for the dissolution of magnesite in H 2 SO 4 solutions. The experiments were performed within the ranges mentioned herein i.e. 20-65°C for reaction temperature, 0.5/100-10/100 g/mL for solid-to-liquid ratio, 0.2-5 M for acid concentration, 5-60 min for reaction time and 150-750 rpm for stirring speed. The optimum conditions for these factors were found to be 65°C, 5/100 g/mL, 2 M, 60 min and 300 rpm, respectively. Under these conditions, the dissolution mass fraction of MgCO 3 in H 2 SO 4 solutions were w = 96.32%.
The Dissolution Study of a South African Magnesium-Based Material from Different Sources
2016
One of the main steps in the wet flue gas desulphurization (WFGD) process is the dissolution of either magnesite or limestone. Evaluating the magnesite dissolution rate is vital for the design and efficient operation of wet FGD plants. A study on the dissolution of magnesite from different sources in South Africa is presented in this work. The effect of reaction temperature (303.15-343.15 K), solid-to-liquid ratio (0.5-2.5g/200 ml), particle size (25-125 µm), pH (4-6) and HCl concentration (0.5-2.5 mol/l) on the dissolution rate was studied. It was found that the dissolution reaction follows a shrinking-core model with the che-mical reaction control as the rate-controlling step. The dissolution rate in-creased with an increase in concentration and reaction temperature and with a decrease in particle size and solid-to-liquid ratio. The activation energy of this dissolution process was found to be 45.685 kJ/mol.
Chemical Industry and Chemical Engineering Quarterly, 2011
One of the main steps in the wet flue gas desulphurization (WFGD) process is the dissolution of either magnesite or limestone. Evaluating the magnesite dissolution rate is vital for the design and efficient operation of wet FGD plants. A study on the dissolution of magnesite from different sources in South Africa is presented in this work. The effect of reaction temperature (303.15-343.15K), solid-to-liquid ratio (0.5-2.5g/200 ml), particle size (25-125?m), pH (4-6) and HCl concentration (0.5-2.5 mol/l) on the dissolution rate was studied. It was found out that the dissolution reaction follows a shrinking-core model with the chemical reaction control as the rate-controlling step. The dissolution rate increased with an increase in concentration and reaction temperature and with a decrease in particle size and solid-to-liquid ratio. The activation energy of this dissolution process was found to be 45.685 kJ/mol.