Leaching kinetics of ulexite ore in aqueous medium at different CO 2 partial pressures

Abstract

This manuscript presents a study regarding the leaching kinetics of ulexite (Na 2 O.2CaO.5B 2 O 3 .16H 2 O) under different CO 2 partial pressures in aqueous media. The effects of the reaction temperature, particle size, CO 2 partial pressure, solid-liquid ratio, and agitation speed were investigated in the boron extraction from the ore. As a result of the experimental studies, it was found that the leaching rate increased with the rise in the reaction temperature and CO 2 partial pressure, and decreased with the increase in the particle size and solid-liquid ratio. The reaction temperature was found to be a significant parameter affecting the leaching rate, which varied from 13% to 97% between 303 and 393 K. Agitation speed appears to have no significant effect on the leaching rate. By using several empirical kinetic models to correlate the experimental data, it was found that the leaching rate fits to the Avrami Model. The activation energy of the process is found to be 21.1 kJ.mol-1 .

Investigation of Kinetic Mechanism of Colemanite in Sodiumbisulfate Solution

“…İkinci bölgede yani yaklaşık 120 saniyeden sonra aktivasyon enerjisinin daha yüksek olması beklenen bir durumdur. Belirli bir zamandan sonra gerek asit konsantrasyonunun düşmesi gerekse kül filminin kalınlaşmasından dolayı, çözünmenin aktivasyon enerjisi yükselmiştir [31][32][33]. Ayrıca hesaplamalar neticesinde, ürün veya kül tabakasından difüzyon kontrol modelinin en yüksek R 2 değeri çıkması seçilen modelin doğruluğunun delilidir.…”

Dielektrik Spektroskopi ile Üleksitin Elektriksel Özellikleri

“…Boron concentrates are either directly used in an application area or processed into a more refined boron product (Mergen & Demirhan, 2009). Boron compounds such as colemanite, tincal and ulexite are attractive materials many application areas due to their great properties (Bideci, 2016;Elçiçek & Kocakerim, 2018). Ulexite which is a mineralrich type of boron plays an important role in heat and sound insulation, glass, ceramics and fertilizer industries, boric acid and borax production (Cicek, 2013;D.…”