{"id":37055,"date":"2023-06-30T12:29:38","date_gmt":"2023-06-30T10:29:38","guid":{"rendered":"https:\/\/www.eramet.com\/?p=37055"},"modified":"2023-08-23T16:29:04","modified_gmt":"2023-08-23T14:29:04","slug":"au-coeur-des-minerais-grace-a-la-microscopie-de-pointe","status":"publish","type":"post","link":"https:\/\/www.eramet.com\/fr\/news\/au-coeur-des-minerais-grace-a-la-microscopie-de-pointe\/","title":{"rendered":"Au c\u0153ur des minerais gr\u00e2ce \u00e0 la microscopie de pointe"},"content":{"rendered":"

Il y a un an, Eramet Ideas, centre de recherche et d\u00e9veloppement du groupe Eramet, accueillait en son sein le MEB (microscope \u00e9lectronique \u00e0 balayage).<\/a>\u00a0Une premi\u00e8re mondiale pour cet \u00e9quipement qui permet d\u2019observer les minerais et m\u00e9taux jusqu\u2019\u00e0 une \u00e9chelle pouvant atteindre plusieurs dizaines de nanom\u00e8tres, afin de constituer des cartographies chimiques. \u00ab\u00a0Cet outil nous permet de mieux conna\u00eetre la r\u00e9partition des \u00e9l\u00e9ments chimiques au sein des min\u00e9raux et m\u00e9taux<\/em>\u00a0\u00bb, explique Micka\u00ebl Dad\u00e9, Ing\u00e9nieur de recherche en m\u00e9tallurgie chez Eramet Ideas.\u00a0\u00ab\u00a0Les connaissances rendues possibles par un tel outil constituent un atout consid\u00e9rable pour l\u2019ensemble de la cha\u00eene de valeur d\u2019Eramet, dans de nombreux domaines.<\/em>\u00a0\u00bb<\/p>\n

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Comprendre les min\u00e9raux pour mieux les exploiter<\/h2>\n

Gr\u00e2ce au MEB, les \u00e9chantillons pr\u00e9lev\u00e9s sur le terrain par\u00a0la cellule Exploration d\u2019Eramet<\/a>, sont analys\u00e9s pour identifier les min\u00e9raux d\u2019int\u00e9r\u00eat pr\u00e9sents, comprendre les processus g\u00e9ologiques conduisant \u00e0 l\u2019enrichissement en m\u00e9taux strat\u00e9giques et ainsi estimer le potentiel \u00e9conomique de la zone \u00e9tudi\u00e9e. C\u2019est gr\u00e2ce \u00e0 cette \u00e9tape pr\u00e9liminaire que le Groupe peut imaginer les futures mines et la meilleure fa\u00e7on de valoriser la ressource.<\/p>\n

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Cartographie EDS (spectroscopie \u00e0 dispersion d’\u00e9nergie) d\u2019un \u00e9chantillon riche en oxydes de mangan\u00e8se pr\u00e9lev\u00e9 dans un gisement de Buritirama (Br\u00e9sil).<\/p><\/div>\n<\/div><\/div><\/div><\/div><\/div>

\n

\u00a0Avec le MEB, nous plongeons au c\u0153ur de la roche pour comprendre la composition et la structure de nos minerais. Plus nous approfondissons notre connaissance sur ceux-ci et sur leur variabilit\u00e9, plus nous sommes en mesure d\u2019anticiper leur comportement dans les usines<\/em><\/p>\n<\/blockquote>\n

Maud Herbelin<\/span><\/span>
\n<\/strong>Ing\u00e9nieur de recherche g\u00e9ologue chez Eramet Ideas<\/p>\n<\/div><\/div><\/div><\/div><\/div>

Am\u00e9liorer la productivit\u00e9 mini\u00e8re et m\u00e9tallurgique<\/h2>\n

L\u2019observation d\u2019\u00e9chantillons de minerais au microscope offre une compr\u00e9hension fine de la texture des min\u00e9raux d\u2019int\u00e9r\u00eat, afin adopter la meilleure strat\u00e9gie d\u2019\u00e9limination des impuret\u00e9s. Par exemple, observer les alliages avec la pr\u00e9cision du MEB permet d\u2019\u00e9tudier l\u2019impact d\u2019un nouveau proc\u00e9d\u00e9 de coul\u00e9e sur la microstructure de silico-mangan\u00e8se.<\/p>\n<\/div>

<\/span>

<\/h2>

Microstructure d'un alliage de silico-mangan\u00e8se observ\u00e9e au MEB apr\u00e8s une coul\u00e9e innovante.une virole<\/p><\/div><\/div><\/div><\/div><\/div><\/div><\/div>

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Illustration de la rupture intergranulaire de la virole du CMM apr\u00e8s plusieurs sollicitations m\u00e9caniques<\/p><\/div>\n

Outre l\u2019optimisation des proc\u00e9d\u00e9s d\u2019enrichissement et d\u2019\u00e9laboration, le MEB est \u00e9galement utilis\u00e9 pour identifier d\u2019\u00e9ventuelles d\u00e9faillances m\u00e9caniques et m\u00e9tallurgiques sur des pi\u00e8ces critiques qui pourraient engendrer une rupture ou un arr\u00eat de la production. Cela a \u00e9t\u00e9 le cas cette ann\u00e9e sur une virole\u00a0d\u2019un four du complexe m\u00e9tallurgique de Moanda (CMM) et plus r\u00e9cemment sur la pompe de GCO.<\/p>\n

Au service de la s\u00e9curit\u00e9<\/h2>\n

Le microscope apporte \u00e9galement sa contribution \u00e0 la s\u00e9curisation des op\u00e9rations\u00a0: cela s\u2019est v\u00e9rifi\u00e9 r\u00e9cemment sur des \u00e9chantillons provenant du d\u00e9partement Exploration, comportant une phase fibreuse, de nature inconnue. Avant d\u2019\u00eatre broy\u00e9, cet \u00e9chantillon a \u00e9t\u00e9 pass\u00e9 sous la colonne du MEB, coupl\u00e9 avec un spectrom\u00e8tre RAMAN, r\u00e9v\u00e9lant qu\u2019il s\u2019agissait en r\u00e9alit\u00e9 de marialite (de la famille de Feldspaths et donc sans risque particulier) et non d\u2019amiante, un min\u00e9ral extr\u00eamement toxique en cas d\u2019inhalation.<\/p>\n

\"\"

Microstructure d\u2019une fonte brute de coul\u00e9e utilis\u00e9e pour des composants critiques de la pompe de GCO<\/p><\/div>\n<\/div><\/div><\/div><\/div><\/div>

Quel avenir pour le MEB ?<\/h2>\n

\u00ab\u00a0Nous sommes aujourd\u2019hui dans l\u2019observation et la compr\u00e9hension, d\u2019une fa\u00e7on qui n\u2019\u00e9tait pas possible jusque-l\u00e0. Le MEB repr\u00e9sente une avanc\u00e9e technologique formidable pour acc\u00e9der \u00e0 un niveau de connaissance sup\u00e9rieur de nos minerais et m\u00e9taux \u00bb, dit Micka\u00ebl Dad\u00e9 ing\u00e9nieur de recherche en m\u00e9tallurgie. \u00ab\u00a0Le d\u00e9veloppement futur de cet outil sera l\u2019application g\u00e9om\u00e9tallurgique \u00e0 proprement parler : c\u2019est-\u00e0-dire l\u2019acquisition de connaissances qui seront \u00e0 la base de l\u2019am\u00e9lioration de la connaissance des gisements du Groupe ainsi que du traitement des minerais dans les proc\u00e9d\u00e9s de m\u00e9tallurgie extractive.\u00a0\u00bb<\/em><\/p>\n<\/div><\/div><\/div><\/div><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":3,"featured_media":37058,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[32],"tags":[193,157,276,314],"class_list":["post-37055","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-groupe","tag-eramet-ideas","tag-france","tag-innovation","tag-recherche-developpement","nature-actualite"],"acf":[],"yoast_head":"\nAu c\u0153ur des minerais gr\u00e2ce \u00e0 la microscopie de pointe - 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