RECUPERAÇÃO DE POTÁSSIO DE MICAS DE FLOGOPITA: MECANISMOS, POTENCIAL AGRONÔMICO E LACUNAS DE PESQUISA – UMA REVISÃO
DOI:
https://doi.org/10.47820/recima21.v6i12.7091Palavras-chave:
Flogopita. Potássio. Solubilização mineral. Agricultura sustentável. Remineralização do solo.Resumo
A flogopita, uma mica potássica rica em magnésio, tem ganhado destaque recente como uma fonte alternativa de potássio (K) para a agricultura sustentável. Diferentemente dos fertilizantes convencionais baseados em sais solúveis, como o cloreto de potássio (KCl), a flogopita é abundante em rochas ultramáficas e pegmatíticas e pode atuar como uma fonte de liberação lenta de K. Esta revisão examina criticamente as propriedades físico-químicas da flogopita, seu comportamento de intemperismo e suas potenciais aplicações agronômicas. Ênfase especial é dada aos avanços recentes em técnicas de ativação térmica, mecanocímica, microbiana e química que aumentam a liberação de potássio. Ensaios agronômicos demonstram resultados promissores em diversas culturas e condições de solo. No entanto, persistem vários desafios, incluindo baixa solubilidade natural, altos custos energéticos de ativação e pouca exploração das reservas globais. Identificam-se lacunas de pesquisa relacionadas à cinética de liberação de K em condições de campo, aos impactos ambientais das rotas de processamento e à escalabilidade das tecnologias de ativação. Esta revisão destaca a flogopita como um recurso promissor na transição para fontes de potássio mais resilientes e produzidas localmente na agricultura.
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