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

Abstract

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

Keywords

• Boric acide,dissolution rate,ulexite,kinetic parameters

Hidrate Edimiş Uleksit Mineralinin Borik Asit Çözeltisindeki Kinetik Parametrelerinin İncelenmesi

Abstract

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

Keywords

• Borik asit,çözünme kinetiği,uleksit,kinetik parametreler

References

1. Abali Y, Bayca SU, Mistincik E, 2006. Kinetics of oxalic acid leaching of tincal. Chem. Eng. J, 123: 25–30.
2. Alkan M, Doğan M, 2004. Dissolution kinetics of colemanite in oxalic acid solutions. Chem. Eng. Process, 43: 867–872.
3. Alkan M, Oktay M, Kocakerim MM, 1991. Dissolution kinetics of some borate minerals in CO2 saturated water. Hydrometallurgy, 26: 255–262.
4. Bakan F, Lacin O, Sarac H, 2016. A Comparison of the Leaching Kinetics and Mechanism of Calcined Magnesite with an Organic Leach Reagent. Journal of the Chemical Society of Pakistan. 38:808-815.
5. Çopur M, Karagöz Ö, Kocakerim MM, 2017. Determination of Optimal Conditions for Retention of Sulfur Dioxide by Waste Ulexite Ore in an Aqueous Medium. Chemical Engineerig Communications, 204: 907-915.
6. Demirkıran N, Künkül A, 2007. Dissolution kinetics of ulexite in perchloric acid solutions. Int. J. Miner. Process, 83: 76–80.
7. Karagöz Ö, Kuşlu S, 2017. Dissolution kinetics of colemanite in potassium dihydrogen phosphate solution (KH2PO4). International Journal of Hydrogen Energy, 42: 23250-23259.
8. Kavcı E, Çalban T, Çolak S, Kuşlu S, 2014. Leaching kinetics of ulexite in sodium hydrogen sulphate solutions. Journal of Industrial and Engineering Chemistry. 20: 2625-2631.

9. Kocakerim MM, Aklan M, 1988. Dissolution kinetics of colemanite in SO2 saturated water. Hydrometallurgy, 19: 385–392.
10. Kum C, Alkan M, Kocakerim MM, 1994. Dissolution kinetics of calcined colemanite in ammonium chloride solution. Hydrometallurgy, 36: 259–268.
11. Mergen A, Demirhan MH, 2009. Dissolution kinetics of probertite in boric acid solution. Int. J. Miner. Process, 90: 16–20.
12. Okur H, Tekin T., Ozer AK, Bayramoğlu M, 2002. Effect of ultrasound on the dissolution of colemanite in H2SO4. Hydrometallurgy 67, 79–86. Scott WW, 1963. Standard Methods of Chemical Analysis. Van Nostrand Co, 6 th. Ed.
13. Temur H, Yartaşı A, Çopur M, Kocakerim MM, 2000. The kinetics of dissolution of colemanite in H3PO4 solutions. Ind. Chem. Res, 39: 4114–4119.
14. Tunc M, Ersahan H, Yapici S, Colak S, 1997. Dehydration Kinetics of Ulexite from Thermogravimetric Data. J. Thermal Anal, 48: 403.
15. Tunc M, Kocakerim MM, Yapıcı S, Bayrakçeken S, 1999. Dissolution mechanism of ulexite in H2SO4 solution. Hydrometallurgy, 51: 359–370.
16. Yartaşı A, Özmetin C, Kocakerim MM, Demirhan MH., 1997. Kinetics and Mechanism of Leching Colemanite in Boric Acid Solutions. Chimica Acta Turcica, 26: 7-13.