Abstract
Dissolution and characterization studies on the purification of muscovite ore in hydrochloric acid for use in paint production was investigated. Specific dissolution parameters including the effects of acid concentration as well as temperature on the dissolution of muscovite ore were studied. Important instrumentation techniques such as X-ray Fluorescence (XRF), X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) were employed for the better explanation of the dissolution process so as to fathom the availability of elements and compounds within the ore. The results revealed that the dissolution rates were considerably influenced as the acid concentration and temperature increased, while at optimal leaching conditions, about 85 % of the ore was found to have been reacted by 2.5 mol/L at 75oC temperature and at 120 minutes of leaching time. The reaction order for the dissolution can be deduced to be half order reaction as the value obtained was in the bracket of 0.50. The reaction kinetic data revealed the dissolution mechanism to involve diffusion and surface chemical mechanisms as the rate-controlling mechanisms while the different instrumentation techniques corroborated the dissolution as well as purification of the muscovite ore as an ingredient for possible use in paint production.
Highlights
Dissolution and characterization studies on the purification of muscovite ore in hydrochloric acid for use in paint production was investigated
From the Scanning Electron Microscopy (SEM) images of the leached muscovite ore particles presented in Figure 9 below, it can be deduced that the SEM photograph shows that the residual products were closely packed with shining surface which suggests that the ore was greatly enhanced by the hydrochloric acid processing
The calculated value of the activation energy obtained in the present study is above 40 kJ/mol; paring the detailed characterization of the raw ore sample with the products obtained after dissolution
Summary
Muscovite ore dissolution was carried out using HCl solution in the concentration range of 0.1 mol/L to 3.0 mol/L at 55◦C and at different leaching times while being moderately stirred at about 300 rpm. The optimal acid concentration obtained was employed to study the extent of reaction temperature on the dissolution rate of muscovite ore dissolution over the temperature ranges of 28 − 75◦C and its result is as shown in the Figure 4. The results of the influence of HCl concentration (Figure 3) were subjected to this kinetic models with the experimental rate constant, kd values and correlation coefficients for each concentration evaluated. The graph of ln Kd versus ln[HCl] was plotted to give the reaction order of 0.4057 as presented in
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