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Concursos » Escola » Física » Processo de separação magnéticaNa natureza, poucos são os materiais encontrados de forma pura. Visto que, qualquer material feito de duas ou mais substâncias, e não são combinadas quimicamente, é considerada uma mistura. Em nosso dia a dia, as misturas são comuns; como exemplo as bebidas, os combustíveis e a própria terra em que pisamos.
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A separação dos componentes puros, a partir de uma mistura, requer o isolamento de um componente do outro e várias técnicas têm sido desenvolvidos com esse intuito. Algumas se baseiam nas diferenças de propriedades físicas dos componentes da mistura. Outros, nas diferenças de propriedades químicas ou de características químicas.
Um dos métodos é o processo de separação magnética, que pode ser classificada em quatro categorias, o meio utilizado e da intensidade de campo que irá influenciar. Assim, existem a separação magnética, a seco, de baixa e de alta intensidade e, a úmido, de alta e baixa intensidade.
A separação magnética a seco funciona com a utilização de um ímã, onde os minérios a serem separados são reunidos em um determinado local e o ímã acaba atraindo essas peças, que posteriormente serão depositadas em outro lugar. Esse tipo de separação pode ser feito a partir de um simples ímã ou com maquinários mais avançados, como um carrossel que atrai os minérios durante o processo de rotação.
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Entretanto, por via úmida é feita uma espécie de lavagem nos minérios com alguns compostos que auxiliam logo após no trabalho.
A separação magnética visa auxiliar também outros setores, como na reciclagem, separando o metal do lixo comum. Na indústria, possibilitando utilizar as seguintes ferramentas para realizar esse tipo de atividade: polias motrizes magnéticas, ímãs suspensos, grades magnéticas e tambores magnéticos para realizar a separação dos metais.
Os principais equipamentos usados para a separação magnética são os tambores, correias, rolos, carrosséis e filtros, e a separação magnética é utilizada na produção de areias quartzosas, feldspatos, nefelina sienitos, dentre outros.
A característica de um material que determina a sua resposta a um campo magnético é a susceptibilidade magnética. Baseado nessa caracteristica, os materiais são classificados em duas categorias: aqueles que são atraídos pelo campo magnético e os que são repelidos por esse campo. Os tipos de material são minerais ferromagnéticos e paramagnéticos:
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Minerais ferromagnéticos que são fortemente atraídos pelo ímã comum.
Os minerais paramagnéticos que são fracamente atraídos pelo ímã comum.
Ambos os materiais possuem permeabilidade magnética mais elevada que a do meio circundante, usualmente, água ou ar. Além disso, concentram um elevado número de linhas de indução provenientes do campo externo.
Importância de realizar-se a separação magnética O processo de separação magnética é bastante favorável, tanto do ponto de vista econômico quanto ambiental, devido a facilidade e rapidez pela qual essa atividade ocorre.
É um procedimento de custo baixo para ser realizado, uma vez que, não é necessário de tecnologias, produtos químicos ou do desenvolvimento de maquinários que dependam de manutenção constante.
Com relação ao meio ambiente, a separação magnética é de grande relevância visto que, nenhum resíduo que tenha sido capaz de impactar, ou poluir, o ambiente. Diferentemente de outros tipos de separação, que acabam gerando lixo ambiental, ou seja, resíduos químicos que precisam ser descartados em algum lugar. Além disso, a separação magnética possibilita a realização de atividades de reciclagem.
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Por Berenice Nogueira Silva