Potassium recovery from Brazilian glauconitic siltstone by hydrothermal treatments
AUTOR(ES)
Safatle, Frederico Amorim; Oliveira, Kátia Dionísio de; Ávila Neto, Cícero Naves de
FONTE
REM, Int. Eng. J.
DATA DE PUBLICAÇÃO
2020-06
RESUMO
Abstract Silicate rock Verdete, collected in the central region of Minas Gerais state (Brazil) and composed mostly of micas (glauconite and muscovite) and tectosilicates (K-feldspar and quartz), was hydrothermally treated with several reactants in order to release and recover potassium. The hydrothermal products were characterized by flame photometry, XRD, XRF, SEM and EDS. Treatment with sulfuric acid was effective to break the crystal lattice of micas before 1 h of reaction and recovered 24% of potassium in the form of sulfates. The K-feldspar appears to have remained intact during the process. Treatment with a Ca(OH)2 (86 wt.%) - CaCO3 (14 wt.%) mixture did not consume the micas, but K-feldspar was gradually consumed over the 24 h reaction period. The K recovery was probably due to a concurrent hydrolytic framework dissolution of K-feldspar mediated by OH− ions and by the exchange of K+ with Ca2+. The K-bearing species are carbonaceous materials with variable K+/Ca2+ ratios, such as K2Ca(CO3)2.
Documentos Relacionados
- Recovery from C-type inactivation is modulated by extracellular potassium.
- SUSCEPTIBILITY OF RATS TO EXPERIMENTAL PYELONEPHRITIS FOLLOWING RECOVERY FROM POTASSIUM DEPLETION*†
- Hydrothermal treatments in the development of isoflavone aglycones in soybean (Glycine max (L.) Merrill) grains
- Characteristics of Injury and Recovery of Net NO3− Transport of Barley Seedlings from Treatments of NaCl
- EVIDENCE SUGGESTING RENAL TUBULAR EXCRETION OF POTASSIUM IN MAN DURING RECOVERY FROM ACUTE RENAL INSUFFICIENCY 1