Thermal Decomposition Kinetics of Lanthanum Oxalate Hydrate Product Treatment From Monazite

Abstract

THERMAL DECOMPOSITION KINETICS OF LANTHANUM OXALATE HYDRATE PRODUCT TREATMENT FROM MONAZITE. Unreacted shrinking core model variation was developed for calcination and solid thermal decomposition reaction to non-catalytic gas and no gas reactants were involved. In this research, thermal decomposition of lanthanum oxalate hydrate product treatment of monazite was studied. The parameters for modeling are time and temperature of thermal decomposition. The time was between 0-150 minutes with 30 minutes intervals and the temperature range between 600-700 o C with 100 o C intervals. Based on the experimental data it can be concluded that the most suitable model was unreacted core sphere ash diffusion controls and obtained the relation between temperature o C with diffusion coefficient following equation = 0.0011 + 0.5175 with linearity R² = 0.9561. Another possible model was the sphere reaction control and obtained the relationship between 1/ (K) and reaction rate constant was = 48873.e-4.88 / with activation energy = 4.88 kJ. The relationship between time t with (radius of particles at time t) at various temperatures and the relation between temperature and at various times follows the exponential line equation. If temperature and time parameters were combined, the relation between time and temperature with following the equation ln =-0.9536 (9E-04 + 0.005) + 4.9976 will be found.

Extraction of Lanthanum Oxide from Different Spent Fluid Catalytic Cracking Catalysts by Nitric Acid Leaching and Cyanex 923 Solvent Extraction Methods

“…The thermal decomposition of lanthanum oxalate decahydrate has previously been described by Grivel et al [28] and Purwani et al [29] through three steps: first, the loss of 10 water molecules to form the anhydrous acetate; next, the formation of lanthanum carbonate basic, and finally, the formation of lanthanum oxide. Lanthanum oxalate decomposition has been reported by Balboul et al [30] as occurring in twelve steps, which include the loss of water molecules, the formation of different basic carbonates (La 2 (CO 3 ) 2 , La 2 O(CO 3 ) 2 y La 2 O 2 CO 3 ) and finally, the formation of lanthanum oxide.…”

Lanthanum Oxide Obtention from Different Spent Fluid Catalytic Cracking Catalysts

“…The thermal decomposition of lanthanum oxalate decahydrate has previously been described by Grivel et al [25] and Purwani et al [26] through three steps: first, the loss of 10 water molecules to form the acetate anhydre; next, the formation of lanthanum carbonate basic, and finally, the formation of lanthanum oxide. In this sense, lanthanum oxalate decomposition has been reported by Balboul et al [27] according to twelve steps, which also include the loss of water molecules, the formation of different basic carbonates (La2(CO3)2, La2O(CO3)2 y La2O2CO3) and finally, the formation of lanthanum oxide.…”

Studying the Effect of Praseodymium Pr Substituted Nd₂Fe₁₄B Alloys on its Magnetic Anisotropic Properties Prepared by Arc Melting

“…But the technology of making permanent magnet based on Nd2Fe14B has been very established especially in advanced countries [7], so that the production of permanent magnetic material Nd2Fe14B is dominated by them, even the development of the technology has reached the nanoparticle and nanocomposite [12][13][14]. While for developing countries the technology of making permanent magnets is still relatively difficult because it is constrained by limited equipment facilities and dependence on imported raw materials [15][16]. Because of these limitations, innovation research is needed that will lead to the empowerment of local natural resources and search for simple technologies for the process of making permanent magnets Nd2Fe14B at low cost until maximum results are obtained [17][18].…”