Search engine for discovering works of Art, research articles, and books related to Art and Culture
Javascript must be enabled to continue!
Investigation of Vietnamese monazite concentrate decomposition by alkaline (KOH) baking method
View through CrossRef
The alkaline (NaOH) hydrometallurgy for monazite concentrate is currently being used in the industrial production of total rare earth oxides (TREOs) and thorium oxide (ThO2). Besides the acknowledged advantages, the hydrometallurgical process also has certain disadvantages such as the requirement for ultra-fine grinding to -325 mesh, and the hydrometallurgy time extended from 8 to 10 hours to achieve ~93 % efficiency. The present paper report a new roasting process using potassium hydroxide (KOH) applied to Vietnamese monazite concentrates. The experimental data were collected using mass analysis, XRD, and ICP-OES analysis. The optimal efficiency of the process is ~95% after roasting time of 0,5 hours, the temperature at 250oC, and KOH:monazite mass ratio = 1:1. Thereby, the alkaline (KOH) roasting process has solved the limitations of the alkaline (NaOH) hydrometallurgy and shows the development potential in deep processing of the monazite concentrate in Vietnam.
Vietnam Atomic Energy Institute
Title: Investigation of Vietnamese monazite concentrate decomposition by alkaline (KOH) baking method
Description:
The alkaline (NaOH) hydrometallurgy for monazite concentrate is currently being used in the industrial production of total rare earth oxides (TREOs) and thorium oxide (ThO2).
Besides the acknowledged advantages, the hydrometallurgical process also has certain disadvantages such as the requirement for ultra-fine grinding to -325 mesh, and the hydrometallurgy time extended from 8 to 10 hours to achieve ~93 % efficiency.
The present paper report a new roasting process using potassium hydroxide (KOH) applied to Vietnamese monazite concentrates.
The experimental data were collected using mass analysis, XRD, and ICP-OES analysis.
The optimal efficiency of the process is ~95% after roasting time of 0,5 hours, the temperature at 250oC, and KOH:monazite mass ratio = 1:1.
Thereby, the alkaline (KOH) roasting process has solved the limitations of the alkaline (NaOH) hydrometallurgy and shows the development potential in deep processing of the monazite concentrate in Vietnam.
Related Results
Geochemistry of Monazite within Carbonatite Related REE Deposits
Geochemistry of Monazite within Carbonatite Related REE Deposits
Approximately >50% of global rare earth element (REE) resources are hosted by carbonatite related deposits, of which monazite is one of the most important REE minerals. Monazite...
Monazite Microstructures and Their Interpretation in Petrochronology
Monazite Microstructures and Their Interpretation in Petrochronology
The phosphate mineral monazite (LREE,Y,Th,Ca,Si)PO4 occurs as an accessory phase in peraluminous granites and Ca-poor meta-psammopelites. Due to negligible common Pb and very low P...
Experimental Evaluation of Improved Biogas Injera Baking Stove
Experimental Evaluation of Improved Biogas Injera Baking Stove
Abstract
Baking and cooking are the daily human activity that needs energy. The main sources of energy for baking injera are biomass and electricity. Wood is the dominating...
EFEKTIVITAS PASTA GIGI BAKING SODA DAN NON BAKING SODA TERHADAP PENURUNAN STAIN PADA PEROKOK
EFEKTIVITAS PASTA GIGI BAKING SODA DAN NON BAKING SODA TERHADAP PENURUNAN STAIN PADA PEROKOK
Many people do not realize that smoking habits can affect the level of dental and oral hygiene, smoking causes abnormalities of the tongue, gums, oral mucosa, palate in the form of...
Using the alteration of magmatic monazite to constrain the thermal history of the Ryoke metamorphic belt (SW Japan)
Using the alteration of magmatic monazite to constrain the thermal history of the Ryoke metamorphic belt (SW Japan)
<p>The Ryoke plutono-metamorphic belt exposed in SW Japan is the type locality for low-Pressure/high-Temperature (LP/HT) metamorphism. The Ryoke metamorphic field gra...
The Application of S‐transform Spectrum Decomposition Technique in Extraction of Weak Seismic Signals
The Application of S‐transform Spectrum Decomposition Technique in Extraction of Weak Seismic Signals
AbstractIn processing of deep seismic reflection data, when the frequency band difference between the weak useful signal and noise both from the deep subsurface is very small and h...
A comparison of Vietnamese, Malaysian, Thai and Indonesian EQ-5D-5L value sets using a Vietnamese sample of HER2 positive breast cancer patients
A comparison of Vietnamese, Malaysian, Thai and Indonesian EQ-5D-5L value sets using a Vietnamese sample of HER2 positive breast cancer patients
Background: Vietnamese value set was published in 2019, but so far there has been no assessment comparison of the Vietnamese value set with other value sets. Objectives: To compare...
VIETNAMESE - EDE BILINGUAL EDUCATION IN PRIMARY SCHOOLS IN DAK LAK PROVINCE, VIETNAM
VIETNAMESE - EDE BILINGUAL EDUCATION IN PRIMARY SCHOOLS IN DAK LAK PROVINCE, VIETNAM
In Dak Lak, the Ede has the second largest population (after the Kinh). In the process of communication, the Ede language has a language contact relationship with Vietnamese. There...