Eficácia do tratamento térmico na extração hidrometalúrgica de potássio em rochas contendo feldspato potássico / Efficiency of heat treatment in the hydrometallurgical extraction of potassium in rocks containing potassium feldspar

Authors

  • Antônio Clareti Pereira
  • Marta Rocha dos Santos Gomes
  • Sônia Denise Ferreira Rocha

DOI:

https://doi.org/10.34115/basr.v2i5.560

Keywords:

Fertilizante, Potássio, K-feldspato, Microclina, Kalsilita, Sanidina, Tratamento térmico.

Abstract

Os Feldspatos são tectossilicatos que contém minerais que são fontes alternativas de K para produção de fertilizantes, porém ainda sem explotação comercial em grande escala, por falta de tecnologia comercial que torne o negócio viável economicamente. Neste trabalho é avaliada a extração de potássio de rochas que contém estes minerais, após tratamento térmico prévio e subsequente extração hidrometalúrgica com H2SO4. Foram avaliadas três temperaturas: 1000°C, 1100°C e 1200°C. Para a fase hidrometalúrgica foi incluída uma amostra do minério “in natura”. Foi selecionada uma amostra contendo Microclina (59%), Sanidina (17%) e Kalsilita (20%) com teores de 20,7% de K2O e 23,5% de Al2O3. O tempo de calcinação foi de 2h para um material com granulometria 100%<0,15mm. A extração de potássio foi conduzida através desolução de H2SO4 com concentração inicial de 20%, por 4h e temperatura de (85±5)°C. Os valores de extrações foram similares, com tendência de queda em 1200°C, mostrando que o tratamento térmico não propiciou nenhum benefício à recuperação hidrometalúrgica. A extração ficou entre 55% e 58%.

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Published

2018-10-08

How to Cite

Pereira, A. C., Gomes, M. R. dos S., & Rocha, S. D. F. (2018). Eficácia do tratamento térmico na extração hidrometalúrgica de potássio em rochas contendo feldspato potássico / Efficiency of heat treatment in the hydrometallurgical extraction of potassium in rocks containing potassium feldspar. Brazilian Applied Science Review, 2(5), 1716–1727. https://doi.org/10.34115/basr.v2i5.560

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Original articles