Investigation dissolution behaviours and kinetics parameters of ulexite in boric acid solution

Abstract

Nowadays, boron and its derivatives are widely used in industrial and technological areas. Boron minerals are the main sources for obtaining pure boron chemicals in the usage of different applications such as the defense industry, health, industry, kitchen equipments, etc. In this paper, for the first time, it has been reported the dissolution behaviors and kinetics parameters of ulexite in the boric acid solution. To solve ulexite by boric acid is important, because boric acid as a solvent prevents the formation of impurities, and therfeore our study is a first in the literature. In this context, the dissolution of the ulexite has been investigated under various experimental parameters such as temperatures, acid concentration, solid/liquid ratio, particle size, dissolution rate, and stirring speed. The experimental findings shown that the dissolution kinetics of ulexite increase with an increase in temperature and acid concentration and a decrease in particle size, but decrease with mixing speed in the acid. Moreover, the dissolution of ulexite in boric acid and activation energy were evaluated. As a result, it was found that the dissolution kinetics were compatible with the chemical control model and the activation energy was 22.024 kJ mol-1 .

Dissolution behavior and kinetic investigation of 〖Ca〗^(2+) in the dissolution of colemanite in propionic acid presence saturated with synthetic flue gas

“…As seen in Figure 8, the increase in propionic acid concentration increases the conversion rate of Ca 2+ in the solution. This situation is thought to increase the hydronium ion (H 3 O + ) in the solution with the increase of the propionic acid concentration and thus accelerate the reaction mechanism [12,28]. According to Equation 9, the solid CaSO 3 0.5H 2 O formed around the unreacted core has a more porous structure than the absence of propionic acid.…”

“…Its different properties displayed in its compounds with various metal or nonmetallic elements allow the use of many boron compounds in industry. These minerals are used in different applications in the fiberglass [9], metallurgy, energy storage, defense industry, waste disposal [10,11], nuclear applications and catalysts, polymer industry [12], rubber, paint, and textile industries [13]. In Türkiye, boric acid production in industry consists of reaction of sulphuric acid with colemanite [14].…”

Investigation of Kinetic Mechanism of Colemanite in Sodiumbisulfate Solution

“…Şekil 3'de görüldüğü üzere, çalışılan aralıkta, sodyum bisülfat konsantrasyonu arttıkça çözünme hızı artmaktadır. Bu nedenle, sodyum bisülfat konsantrasyonunun artışıyla birlikte çözelti içerisinde bulunan hidronyum iyonunun arttığı ve böylece reaksiyon mekanizmasını hızlandırdığı düşünülmektedir[22][23][24].Şimşek H. M. ve Yeşilyurt M. / BORON 6(4), 395 -401, 2021 Kolemanitin çözünme oranına NaHSO 4 konsantrasyonunun etkisi (Effect of NaHSO 4 concentration on dissolution rate of colemanite).…”