Investigation of extraction of bastnaesite ore by alkaline leaching

Yıl 2020, Cilt: 3 Sayı: 1, 34 - 40, 30.06.2020

Tuğba Deniz Tombal Kara İlgin Kurşun

Öz

In this study, a composite sample was prepared from the representative samples of the experiments taken from three different areas in Eskisehir-Kizilcaoren region, Turkey, and this composite sample was used for the leaching experiments. Considering the particle size analysis of the sample, the d50 and the d80 sizes of the sample were found to be 0.45 mm and 1.58 mm, respectively. It was determined from the fractional particle size analysis that the sample contained 2.79% La, 2.27% Ce, 0.29% Nd, 450 ppm Y, 0.69% Th, and 200.3 ppm U. The samples reduced to-38 μm were used for the leaching experiments. The leaching parameters, namely, 15-50% solids ratio, 30-320 min. of the leaching time, 25-500 kg/ton NaOH dosage, and 25-70oC pulp temperature were investigated in the leaching experiments. The optimum conditions for the leaching experiments for Th and REE (Ce, Nd, La) were obtained as 35% solids ratio, 500 kg/ton NaOH dosage, 120 min leaching time, and 50oC pulp temperature. As a result of the experiments carried out under these optimum conditions, 65.15% Th, 54.21% Cd, 45.44% Nd, and 54.01% La dissolution efficiencies were obtained.

Anahtar Kelimeler

rare earth elements, thorium, alkaline leaching, bastnaesite

Bastnazit cevherinin alkali liçiyle ekstraksiyonunun araştırılması

Öz

Bu çalışmada, Eskişehir-Kızılcaören yöresindeki üç farklı bölgeden alınan temsili numuneler harmanlanarak kompozit bir numune hazırlanmış ve liç deneylerinde bu numune kullanılmıştır. Tane boyutu analizi sonuçlarına göre, numunenin d50 ve d80 boyutları sırasıyla 0,45 mm ve 1,58 mm olarak bulunmuştur. Fraksiyonel tane boyutu analizi sonuçlarına göre numunenin %2,79 La, %2,27 Ce, %0,29 Nd, 450 ppm Y, %0,69 Th ve 200,3 ppm U içerdiği tespit edilmiştir. Liç deneylerinde -38 μm tane boyutunda numuneler kullanılmıştır. Liç deneylerinde, %15-50 katı oranı, 30-320 dakika liç süresi, 25-500 kg/ton NaOH dozajı ve 25-70oC liç sıcaklığı parametrelerinin Th ve NTE çözünme verimleri üzerine etkileri araştırılmıştır. Deneylerde optimum koşullar, % 35 katı oranı, 500 kg/ton NaOH dozajı, 120 dakika liç süresi ve 50oC pülp sıcaklığı olarak elde edilmiştir. Bu optimum koşullar altında yapılan deneyler sonucunda %65,15 Th, % 54,21 Cd, % 45,44 Nd ve %54,01 La çözünme verimleri elde edilmiştir.

Anahtar Kelimeler

nadir toprak elementleri, toryum, alkali liçi, bastnazit

Kaynakça

• [1] Binnemans, K., Jones, P. T., Blanpain, B., Van Garven, T., Yang, Y., Walton, A., Buchert, M. (2013). Recycling of rare earths: a critical review. Journal of Cleaner Production, 51, 1-22.
• [2] Xie, F., An Zhang, T., Dreisinger, D., Doyle, F. (2014). A critical review on solvent extraction of rare earths from aqueous solutions. Minerals Engineering, 56, 10-28.
• [3] Ghasemi, S. M. S., Azizi, A. (2018). Alkaline leaching of lead and zinc by sodium hydroxide: kinetics modelling. Journal of Materials Research and Technology, 7(2), 118-125.
• [4] Sadri, F., Nazari, A. M., Ghahreman, A. (2017). A review on the cracking, baking and leaching processes of rare earth element concentrates. Journal of Rare Earths, 35(8), 739-752.
• [5] Wu, S., Wang, L., Zhao, L., Zhang, P., El-Shall, H., Moudgil, B., Huang, X., Zhang, L. (2018). Recovery of rare earth elements from phosphate rock by hydrometallurgical processes – A critical review. Chemical Engineering Journal, 335, 774-800.
• [6] Akar, A., Ozmerih, L. (1974). Thorium. Scientific Mining Journal, 13(1), 27-34.
• [7] Kaya, M., Bozkurt, V. (2003). Thorium as a nuclear fuel. 18th. International Mining Congress and Exhibition of Turkey – IMCET, 571-578.
• [8] Kaya, M. (2008). Perspective of thorium nuclear fuel, and the importance of energy production in our country. 14. International Energy and Environmental Technology Systems Fair and Conferences, ICCI-2008, 256-263.
• [9] World Nuclear Association. (2014). Thorium. [online], http://www.world-nuclear.org/info/current-and-future-generation/thorium/ [Visit Date: 03.02.2015].
• [10] TUBITAK. (2015). Usage Areas of Elements. [online], http://www.biltek.tubitak.gov.tr/bilgipaket/periyodik/kullanim5.html, [Visit Date: 02.02.2015].
• [11] Zhang, Q., Saito F. (1998). Non-thermal process for extracting rare earths from bastnaesite by means of mechanochemical treatment. Hydrometallurgy, 47, 231-241.
• [12] Ozbayoglu, G., Atalay M. U. (2000). Beneficiation of bastnaesite by a multi-gravity separator. Journal of Alloys and Compounds, 303–304, 520–523.
• [13] Bian, X., Yin, S., Luo, Y., Wu, W. (2011) Leaching kinetics of bastnaesite concentrate in HCl solution. Transactions of Nonferrous Metals Society of China, 21, 2306-2310.
• [14] Huang, Y., Zhang, T., Dou, Z., Liu, J., Tang, F. (2014). Study on leaching rare earths from bastnaesite treated by calcification transition. Journal of Rare Earths, 32(11), 1043-1047.
• [15] Peelman, S., Sun, Z. H. I., Sietsma, J., Yang, Y. (2014). Leaching of rare earth elements: past and present. ERES2014: 1st European Rare Earth Resources Conference, Milos.
• [16] Wang, L., Huang, X., Yu, Y., Zhao, L., Wang, C., Feng, Z., Cui, D., Long, Z. (2017). Towards cleaner production of rare earth elements from bastnaesite in China. Journal of Cleaner Production, 165, 231-242.
• [17] Barbosa, J. P., Ribeiro, R. A., Cunha, O. G. C. (2001). Alkaline leaching of a xenotime concentrate. VI SHMMT I XVIII ENTMME, Rio De Janeiro, Brasil.
• [18] Kandil A. T., El Faramawy H. F. (2009). An improved method for leaching of thorium in monazite using sodium hydroxide. Egyptian Journal of Chemistry, 52(5), 643-653.
• [19] Celep, O. (2011). Application of alkaline pretreatments for gold and silver recovery from refractory ores, PhD Dissertation, Karadeniz Technical University, The Graduate School of Natural and Applied Sciences, Mining Engineering Graduate Program, Trabzon, TURKEY.