Investigation of Kinetic Parameters of Dehydrated Ulexite Mineral in Boric Acide Solution

Öz

Ulexite used in the production of boron compounds is an important mineral. In this work, the kinetic

parameters of dehydrated ulexite mineral and orginal ulexite in boric acid solution were investigated. According to

the DTA diagram, it was seen that the mineral did not change the structure until around 170 oC. It was observed that

the dissolution kinetics increased to this temperature. In the SEM images, it was observed that the number of pores

in the mineral was increased until 170 oC and afterwards number of pores was decreased. The kinetic parameters

of the original ulexite were evaluated. Study indicates that the dissolution kinetics model in the boric acide was

found as below;

1-(1-X)-1 = [2.02(Rp)-1,013[CA]0 0,4579(S.L-1)-0650(M.S)0,0545e-2649,12T-1].t

Anahtar Kelimeler

• Boric acide,dissolution rate,ulexite,kinetic parameters

Hidrate Edimiş Uleksit Mineralinin Borik Asit Çözeltisindeki Kinetik Parametrelerinin İncelenmesi

Öz

Bor bileşiklerinin üretiminde kullanılan Uleksit çok önemli bir bor mineralidir. Bu çalışmada hidrate

edilmiş uleksit minerali ve orginal mineralinin borik asit çözeltisindeki kinetik parametreleri incelenmiştir. DTA

diyagramına göre 170 oC’ye kadar mineral yapısında değişim olmadığı görülmüştür. Bu sıcaklık aralığında çözünme

kinetiğinin arttığı gözlendi. SEM görüntülerinden 170 oC’ye kadar mineral gözeneklerinde açılmaların arttığı, bu

sıcaklıktan sonra ise azaldığı gözlemlendi. Orijinal uleksite ait kinetik parametreler değerlendirildi. Mineralin borik

asitteki çözünme kinetiği aşağıda ki gibi bulundu;

1-(1-X)-1 = [2.02(Rp)-1,013[CA]0 0,4579(S.L-1)-0650(M.S)0,0545e-2649,12T-1].t

Anahtar Kelimeler

• Borik asit,çözünme kinetiği,uleksit,kinetik parametreler

Kaynakça

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