Abstract
The aim of the study is to propose an alternative process to boric acid generation by researching the dissolution kinetic of tincal in phosphoric acid solutions in high temperature, and to root the procuring of Na2HPO4 that is used commonly as byproduct in industry during the process. Reaction temperature, particle size, stirring speed, acid concentration and solid/liquid ratio were selected as parameters of dissolution rate of tincal. The tincal solubility has been found to increase by the temperature, stirring speed and decrease by the particle size and solid/liquid ratio. In the case of acid concentration, the solubility has been found to increase up to 2 M but decrease beyond this concentration. The solubility has been assigned to first order pseudo model. The activation energy has been found to be 46.21 KJ/mol. The solubility of tincal in phosphoric acid solution at high temperature has been defined by the following expression depending on reaction temperature, acid concentration solid/liquid ratio, stirring speed and particle size: -ln(1-X) = 1988.D-0.78.C0.22.S/L-0.39.W0.99.e5558.4/T.t. Key words: Tincal, phosphoric acid, leaching kinetics, high temperature.
Highlights
Boron is an element commonly existing in soil, rock and water on earth
The aim of the study is to propose an alternative process to boric acid generation by researching the dissolution kinetic of tincal in phosphoric acid solutions in high temperature, and to root the procuring of Na2HPO4 that is used commonly as byproduct in industry during the process
The solubility of tincal in phosphoric acid solution at high temperature has been defined by the following expression depending on reaction temperature, acid concentration solid/liquid ratio, stirring speed and particle size: -ln(1-X) = 1988.D-0.78.C0.22.S/L-0.39.W0.99.e5558.4/T.t
Summary
Boron exists in high concentrations in the vicinity reposing from Mediterranean and the west regions of the USA to Kazakhistan as well as the boron content of soil which is generally 10 to 20 ppm on average. It is between the range of 0.5 to 9.6 ppm in sea water and 0.01 to 1.5 ppm fresh water. Boron seams in high concentrations and economical dimensions mostly exist in the arid, volcanic regions and the regions whose hydrothermal activity is high of Turkey and the USA as enchained compounds of boron with oxygen (Woods, 1994). The specifical boron compounds synthesized by using the minerals place a premium on in terms of both economically and usage area rather than the direct consumption of boron minerals
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