{"id":7713,"date":"2025-03-22T07:31:42","date_gmt":"2025-03-22T07:31:42","guid":{"rendered":"https:\/\/jinsuncarbon.com\/?p=7713"},"modified":"2025-03-22T07:31:42","modified_gmt":"2025-03-22T07:31:42","slug":"o-que-e-grafite-purificado","status":"publish","type":"post","link":"https:\/\/jinsuncarbon.com\/pt\/o-que-e-grafite-purificado\/","title":{"rendered":"O que \u00e9 grafite purificado?"},"content":{"rendered":"<p>No campo da ci\u00eancia dos materiais, o grafite \u00e9 amplamente utilizado com suas propriedades f\u00edsicas e qu\u00edmicas exclusivas, desde pontas de l\u00e1pis at\u00e9 produtos de alta tecnologia. Entretanto, h\u00e1 muitas impurezas no grafite natural, o que afeta seriamente o desempenho. E o grafite purificado se tornou a chave, o que pode ajud\u00e1-lo a desempenhar um valor maior e promover o desenvolvimento da tecnologia.<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_74 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u00cdndice<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Alternar tabela de conte\u00fado\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Alternar<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-que-e-grafite-purificado\/#Preparation_method_of_purified_graphite\" >M\u00e9todo de prepara\u00e7\u00e3o de grafite purificado<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-que-e-grafite-purificado\/#Physical_method\" >M\u00e9todo f\u00edsico<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-que-e-grafite-purificado\/#High_temperature_sublimation_method\" >M\u00e9todo de sublima\u00e7\u00e3o de alta temperatura:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-que-e-grafite-purificado\/#Chemical_method\" >M\u00e9todo qu\u00edmico<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-que-e-grafite-purificado\/#Purified_graphite_performance_characterization\" >Caracteriza\u00e7\u00e3o do desempenho do grafite purificado<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-que-e-grafite-purificado\/#Purity_test_means\" >Teste de pureza significa<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-que-e-grafite-purificado\/#Microstructure_observation\" >Observa\u00e7\u00e3o da microestrutura<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-que-e-grafite-purificado\/#Performance_Test\" >Teste de desempenho<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-que-e-grafite-purificado\/#Purified_graphite_applications\" >Aplica\u00e7\u00f5es de grafite purificado<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-que-e-grafite-purificado\/#Lithium-ion_batteries\" >Baterias de \u00edons de l\u00edtio<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-que-e-grafite-purificado\/#Semiconductor_manufacturing\" >Fabrica\u00e7\u00e3o de semicondutores<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-que-e-grafite-purificado\/#Nuclear_industry\" >Setor nuclear<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-que-e-grafite-purificado\/#High-end_lubricating_materials\" >Materiais lubrificantes de alta qualidade<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/jinsuncarbon.com\/pt\/o-que-e-grafite-purificado\/#Conclusion\" >Conclus\u00e3o<\/a><\/li><\/ul><\/nav><\/div>\n\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Preparation_method_of_purified_graphite\"><\/span>M\u00e9todo de prepara\u00e7\u00e3o de grafite purificado<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Physical_method\"><\/span>M\u00e9todo f\u00edsico<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong><b>M\u00e9todo de flota\u00e7\u00e3o:<\/b><\/strong><\/p>\n<p>A separa\u00e7\u00e3o \u00e9 obtida com base na diferen\u00e7a das propriedades f\u00edsicas da superf\u00edcie do grafite e das impurezas. Especialmente a diferente molhabilidade. A hidrofobicidade natural do grafite \u00e9 boa, e os minerais de impureza s\u00e3o hidrof\u00edlicos. O min\u00e9rio de grafite \u00e9 mo\u00eddo e misturado com \u00e1gua para formar uma polpa, e s\u00e3o adicionados um coletor e um agente espumante. O coletor torna o grafite mais hidrof\u00f3bico e mais f\u00e1cil de aderir \u00e0s bolhas. O agente espumante produz bolhas est\u00e1veis. Atrav\u00e9s do ar para a polpa, o grafite flutua com as bolhas para formar uma camada de espuma. E as impurezas permanecem no fundo para conseguir a separa\u00e7\u00e3o.<\/p>\n<p>&nbsp;<\/p>\n<p>O processo \u00e9 simples, de baixo custo, adequado para o tratamento em larga escala de min\u00e9rio de grafite. Por\u00e9m, \u00e9 dif\u00edcil remover impurezas de incrusta\u00e7\u00e3o de granula\u00e7\u00e3o fina e o efeito de purifica\u00e7\u00e3o \u00e9 limitado. Em geral, s\u00f3 \u00e9 poss\u00edvel aumentar a pureza do grafite para 80%-90%.<\/p>\n<p><strong><b> <img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-7774\" src=\"https:\/\/jinsuncarbon.com\/wp-content\/uploads\/2025\/03\/Purified-Graphite.jpg\" alt=\"Grafite purificado\" width=\"445\" height=\"445\" srcset=\"https:\/\/jinsuncarbon.com\/wp-content\/uploads\/2025\/03\/Purified-Graphite.jpg 750w, https:\/\/jinsuncarbon.com\/wp-content\/uploads\/2025\/03\/Purified-Graphite-300x300.jpg 300w, https:\/\/jinsuncarbon.com\/wp-content\/uploads\/2025\/03\/Purified-Graphite-150x150.jpg 150w, https:\/\/jinsuncarbon.com\/wp-content\/uploads\/2025\/03\/Purified-Graphite-12x12.jpg 12w, https:\/\/jinsuncarbon.com\/wp-content\/uploads\/2025\/03\/Purified-Graphite-144x144.jpg 144w, https:\/\/jinsuncarbon.com\/wp-content\/uploads\/2025\/03\/Purified-Graphite-600x600.jpg 600w, https:\/\/jinsuncarbon.com\/wp-content\/uploads\/2025\/03\/Purified-Graphite-100x100.jpg 100w\" sizes=\"(max-width: 445px) 100vw, 445px\" \/><\/b><\/strong><\/p>\n<h3><span class=\"ez-toc-section\" id=\"High_temperature_sublimation_method\"><\/span>M\u00e9todo de sublima\u00e7\u00e3o de alta temperatura:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>O uso de grafite e a temperatura de sublima\u00e7\u00e3o das impurezas s\u00e3o diferentes na purifica\u00e7\u00e3o. O ponto de fus\u00e3o do grafite chega a 3652 \u2103 e \u00e9 dif\u00edcil derreter sob press\u00e3o atmosf\u00e9rica. Sob alta temperatura <a href=\"https:\/\/en.wikipedia.org\/wiki\/Vacuum\" target=\"_blank\" rel=\"noopener\">v\u00e1cuo<\/a>A temperatura est\u00e1 acima de 2700\u00b0C. As impurezas, como sil\u00edcio, alum\u00ednio e ferro, s\u00e3o preferencialmente sublimadas, e o grafite permanece basicamente s\u00f3lido. Coloque o grafite em um forno especial de alta temperatura. A 10<sup>&#8211;<\/sup><sup>3<\/sup><sup>\u00a0<\/sup>-10<sup>&#8211;<\/sup><sup>5<\/sup><sup>\u00a0<\/sup>Pa alta temperatura de v\u00e1cuo de 2800-3000 \u2103, as impurezas sublimam ap\u00f3s serem extra\u00eddas pela bomba de v\u00e1cuo. Assim, \u00e9 poss\u00edvel obter grafite com pureza superior a 99,99%. No entanto, o equipamento \u00e9 caro, o consumo de energia \u00e9 grande e a escala de produ\u00e7\u00e3o \u00e9 limitada.<\/p>\n<p><strong><b>\u00a0<\/b><\/strong><\/p>\n<h3><span class=\"ez-toc-section\" id=\"Chemical_method\"><\/span>M\u00e9todo qu\u00edmico<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong><b>M\u00e9todo de \u00e1cido alcalino: <\/b><\/strong><\/p>\n<p>Geralmente, usa-se o m\u00e9todo de purifica\u00e7\u00e3o qu\u00edmica, a rea\u00e7\u00e3o com \u00e1lcali e \u00e1cido para converter as impurezas em subst\u00e2ncias sol\u00faveis a serem removidas. Primeiro, misture grafite e hidr\u00f3xido de s\u00f3dio em propor\u00e7\u00e3o e asse-os a 500-700 \u2103. E as impurezas, como s\u00edlica e alumina, reagem para produzir silicato de s\u00f3dio e metaaluminato de s\u00f3dio. Os produtos torrados foram imersos em \u00e1gua e filtrados para remover o sal sol\u00favel. Em seguida, adiciona-se \u00e1cido clor\u00eddrico ao res\u00edduo do filtro, ferro, c\u00e1lcio e outras impurezas met\u00e1licas para produzir cloreto sol\u00favel. Ap\u00f3s a filtragem, o grafite purificado \u00e9 lavado. O processo \u00e9 maduro, o equipamento \u00e9 simples, o efeito de purifica\u00e7\u00e3o \u00e9 bom e pode aumentar a pureza do grafite para 95%-99%. Mas produzir\u00e1 muitos res\u00edduos de \u00e1guas residuais, poluindo o meio ambiente.<\/p>\n<p>&nbsp;<\/p>\n<p><strong><b>M\u00e9todo do \u00e1cido fluor\u00eddrico: <\/b><\/strong><\/p>\n<p>O uso do \u00e1cido fluor\u00eddrico e a purifica\u00e7\u00e3o de impurezas. O \u00e1cido fluor\u00eddrico reage com impurezas, como o di\u00f3xido de sil\u00edcio, para formar o g\u00e1s tetrafluoreto de sil\u00edcio vol\u00e1til. O grafite \u00e9 misturado com \u00e1cido fluor\u00eddrico em propor\u00e7\u00e3o, reage na temperatura adequada, \u00e9 filtrado e lavado no final para obter grafite de alta pureza. Isso pode aumentar a pureza do grafite para mais de 99%. No entanto, o \u00e1cido fluor\u00eddrico \u00e9 altamente corrosivo e t\u00f3xico, com altos requisitos de seguran\u00e7a para equipamentos e pessoal. Al\u00e9m disso, \u00e9 dif\u00edcil tratar \u00e1guas residuais contendo fl\u00faor, e o custo de prote\u00e7\u00e3o ambiental \u00e9 alto.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Purified_graphite_performance_characterization\"><\/span>Caracteriza\u00e7\u00e3o do desempenho do grafite purificado<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Purity_test_means\"><\/span>Teste de pureza significa<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong><b>An\u00e1lise qu\u00edmica: <\/b><\/strong><\/p>\n<p>Usando instrumentos para analisar quantitativamente os elementos de impureza do grafite para determinar a pureza. Como o ICP-MS, \u00e9 poss\u00edvel medir simultaneamente uma variedade de oligoelementos, com sensibilidade ultra-alta, e detectar um teor muito baixo de impurezas. A AAS se concentra principalmente em impurezas met\u00e1licas, atomizando a amostra e medindo o grau de absor\u00e7\u00e3o de luz. A concentra\u00e7\u00e3o de impureza \u00e9 calculada com precis\u00e3o e, em seguida, a pureza do grafite \u00e9 obtida.<\/p>\n<p>&nbsp;<\/p>\n<p><strong><b>M\u00e9todo de determina\u00e7\u00e3o de cinzas: <\/b><\/strong><\/p>\n<p>A amostra de grafite \u00e9 queimada a 950-1000 \u2103 para obter peso constante, mat\u00e9ria org\u00e2nica vol\u00e1til, etc. A fra\u00e7\u00e3o de massa de cinza restante pode refletir indiretamente a pureza do grafite. A opera\u00e7\u00e3o \u00e9 simples, mas somente o conte\u00fado total de impurezas pode ser conhecido. E os tipos espec\u00edficos de impureza n\u00e3o podem ser definidos.<\/p>\n<p>&nbsp;<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Microstructure_observation\"><\/span>Observa\u00e7\u00e3o da microestrutura<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong><b>Microsc\u00f3pio eletr\u00f4nico de varredura (SEM)<\/b><\/strong><\/p>\n<p>Usado para observar a situa\u00e7\u00e3o microsc\u00f3pica do grafite, que pode mostrar claramente a estrutura em camadas, a morfologia do cristal e a distribui\u00e7\u00e3o de impurezas. Em alta resolu\u00e7\u00e3o, \u00e9 poss\u00edvel ver at\u00e9 mesmo caracter\u00edsticas microsc\u00f3picas, como defeitos de cristal. Isso nos ajuda a entender as propriedades do grafite e os efeitos da purifica\u00e7\u00e3o em sua estrutura.<\/p>\n<p><strong><b>\u00a0<\/b><\/strong><\/p>\n<p><strong><b>Microscopia eletr\u00f4nica de transmiss\u00e3o (TEM) :<\/b><\/strong><\/p>\n<p>Permite o estudo aprofundado da microestrutura do grafite, como a estrutura da rede. Ele penetra em amostras finas e usa difra\u00e7\u00e3o de el\u00e9trons e t\u00e9cnicas de imagem para revelar arranjos at\u00f4micos. Ajuda a estudar as altera\u00e7\u00f5es na estrutura cristalina do grafite durante a purifica\u00e7\u00e3o.<\/p>\n<p>&nbsp;<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Performance_Test\"><\/span>Teste de desempenho<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong><b>Teste de condutividade:<\/b><\/strong><\/p>\n<p>A condutividade do grafite em si \u00e9 boa, e fica melhor ap\u00f3s a purifica\u00e7\u00e3o. O m\u00e9todo de quatro sondas \u00e9 comumente usado para medir a resist\u00eancia el\u00e9trica e calcular a condutividade el\u00e9trica, que \u00e9 a chave para a medi\u00e7\u00e3o. Nas baterias de \u00edons de l\u00edtio, o \u00e2nodo de grafite com alta condutividade pode melhorar a efici\u00eancia de carga e descarga da bateria.<\/p>\n<p>&nbsp;<\/p>\n<p><strong><b>Teste de estabilidade t\u00e9rmica: <\/b><\/strong><\/p>\n<p>A estabilidade t\u00e9rmica \u00e9 fundamental para o grafite em aplica\u00e7\u00f5es de alta temperatura. As mudan\u00e7as de massa e calor foram analisadas por an\u00e1lise termogravim\u00e9trica (TGA) e calorimetria de varredura diferencial (DSC), respectivamente. Para avaliar a estabilidade do desempenho do grafite em diferentes temperaturas.<\/p>\n<p><strong><b>\u00a0<\/b><\/strong><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Purified_graphite_applications\"><\/span>Aplica\u00e7\u00f5es de grafite purificado<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Lithium-ion_batteries\"><\/span>Baterias de \u00edons de l\u00edtio<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Nas baterias de \u00edons de l\u00edtio, o grafite \u00e9 um elemento comum <a href=\"https:\/\/jinsuncarbon.com\/pt\/\/graphite-anode\/\">\u00e2nodo<\/a> material. O grafite purificado tem maior capacidade espec\u00edfica te\u00f3rica e melhor estabilidade de ciclo, o que pode reduzir a obstru\u00e7\u00e3o de impurezas \u00e0s atividades de \u00edons de l\u00edtio. Ele pode reduzir a resist\u00eancia interna, melhorar a densidade de energia da bateria, a efici\u00eancia de carga e descarga e o desempenho da taxa, al\u00e9m de prolongar a vida \u00fatil do ciclo. Al\u00e9m disso, pode atender \u00e0 demanda por baterias de alto desempenho, como as de ve\u00edculos el\u00e9tricos.<\/p>\n<p>&nbsp;<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Semiconductor_manufacturing\"><\/span>Fabrica\u00e7\u00e3o de semicondutores<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>A fabrica\u00e7\u00e3o de semicondutores exige uma pureza muito alta do material. Voc\u00ea pode usar o grafite purificado em equipamentos de produ\u00e7\u00e3o <a href=\"https:\/\/jinsuncarbon.com\/pt\/\/graphite-boat\/\">barcos de grafite<\/a>e outros componentes. Devido ao seu baix\u00edssimo teor de impurezas, ele pode evitar a polui\u00e7\u00e3o dos dispositivos semicondutores. Sua alta pureza e estabilidade t\u00e9rmica podem atender aos requisitos de processos de alta temperatura e alta precis\u00e3o. Para garantir a produ\u00e7\u00e3o de dispositivos semicondutores de alta qualidade.<\/p>\n<p>&nbsp;<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Nuclear_industry\"><\/span>Setor nuclear<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No setor nuclear, o grafite \u00e9 usado como moderador de n\u00eautrons e material reflexivo. O desempenho da desacelera\u00e7\u00e3o de n\u00eautrons do grafite purificado \u00e9 bom e a estabilidade qu\u00edmica \u00e9 forte. Ele pode controlar efetivamente a velocidade e a distribui\u00e7\u00e3o dos n\u00eautrons e reduzir a interfer\u00eancia das impurezas nas rea\u00e7\u00f5es nucleares. Ele melhora a seguran\u00e7a do reator e a efici\u00eancia da opera\u00e7\u00e3o e \u00e9 de grande import\u00e2ncia em reatores nucleares avan\u00e7ados.<\/p>\n<p>&nbsp;<\/p>\n<h3><span class=\"ez-toc-section\" id=\"High-end_lubricating_materials\"><\/span>Materiais lubrificantes de alta qualidade<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>O grafite tem bom desempenho de lubrifica\u00e7\u00e3o e \u00e9 uma mat\u00e9ria-prima importante para materiais lubrificantes de alta qualidade. Os materiais de lubrifica\u00e7\u00e3o feitos de grafite purificado podem manter um excelente desempenho de lubrifica\u00e7\u00e3o em condi\u00e7\u00f5es extremas, como alta temperatura, alta press\u00e3o e alto v\u00e1cuo. Ele pode atender \u00e0s necessidades exigentes de equipamentos no campo aeroespacial e reduzir o desgaste dos componentes.<\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclus\u00e3o<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>O grafite purificado pode remover efetivamente as impurezas e melhorar o desempenho. E diferentes m\u00e9todos de purifica\u00e7\u00e3o t\u00eam vantagens e desvantagens, que devem ser consideradas de forma abrangente. Ele tem grande valor de aplica\u00e7\u00e3o em muitos campos e promove o desenvolvimento industrial. No futuro, ser\u00e3o desenvolvidas e aplicadas tecnologias de purifica\u00e7\u00e3o mais eficientes, ecologicamente corretas e de baixo custo.<\/p>","protected":false},"excerpt":{"rendered":"<p>In the field of materials science, graphite is widely used with its unique physical and chemical properties, from pencil leads to high-tech products. However, there are many impurities in natural graphite, which seriously affects the performance. 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