Published December 1976 | Version v1
Report Open

Optimization of the caldasite processing conditions by alcaline melting

Creators

Description

A study has been done to recover economically the uranium and zirconium values of the ores at Pocos de Caldas Plateau in the state of Minas Gerais, Brazil. In a preliminar study, it was investigated the opening of the ore by alcaline fusion that were carried out in a temperature controlled furnace and the variables studied were the time, temperature and NaOH/ore ratio. The optimization procedure was based on the steepest Ascent Method developed by Box and Wilson, utilizing a complete 23 factorial design. The analysis of the data indicated the response optimum for the process in: time 1.52 +-0.1 hour; temperature 805 +-15degC; NaOH/ore ratio 1.7 ton/ton. Solubilizations higher than 97%ZrO2 and recuperations nearly of 100%U3O8 are obtained arouns this point

Availability note (English)

MF available from INIS under the Report Number.

Abstract (Portuguese)

Um estudo de viabilidade tecnico-economica do uso das reservas potenciais de zirconio e uranio do planalto alcalino de Pocos de Caldas, Minas Gerais. Em uma fase preliminar, investigou-se a abertura do minario por fusao com hidroxido de sodio. As fusoes alcalinas foram feitas em em forno de temperatura controlada, mentendo-se constante a massa e a granulometria do minerio. As variaveis estudadas foram o tempo da fusao, a temperatura de fusao e a relacao NaOH/minerio. O processo de otimizacao baseou-se no metodo de ascencao mais rapida, desenvolvido por Box e Wilson, partindo-se de uma programcao fatorial completa de 23 em 3 variaveis. Da analise dos resultados, concluiu-se que as condicoes otimizadas do processo de abertura do caldasito sao: tempo de fusao: 1,52+-0,1 hora; temperatura de fusao: 805+-15degC; relacao NaOH/minerio: 1,7 t/t. Solubililizacoes superiores a 97% ZrO2 e de cerca de 100% U3O8 sao obtidas em torno deste ponto experimental

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Additional details

Additional titles

Original title (Portuguese)
Otimizacao das condicoes de abertura do caldasito por fussao alcalina

Publishing Information

Imprint Pagination
20 p.
Journal Issue
no. 453
Series
Publicacao IEA.
Report number
IEA--453

INIS

Country of Publication
Brazil
Country of Input or Organization
Brazil
INIS RN
9357002
Subject category
S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
Descriptors DEI
BADDELEYITE; BRAZIL; CALDASITE; ECONOMICS; GEOLOGIC DEPOSITS; MELTING; ORE PROCESSING; SODIUM HYDROXIDES; URANIUM ORES; ZIRCON
Descriptors DEC
ALKALI METAL COMPOUNDS; CHALCOGENIDES; DEVELOPING COUNTRIES; HAFNIUM COMPOUNDS; HAFNIUM OXIDES; HYDROGEN COMPOUNDS; HYDROXIDES; MINERALS; ORES; OXIDES; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; RADIOACTIVE MATERIALS; RADIOACTIVE MINERALS; ROCKS; SILICATES; SILICON COMPOUNDS; SODIUM COMPOUNDS; SOUTH AMERICA; TRANSITION ELEMENT COMPOUNDS; ZIRCONIUM COMPOUNDS; ZIRCONIUM OXIDES; ZIRCONIUM SILICATES