{"id":218608,"date":"2020-08-06T10:19:31","date_gmt":"2020-08-06T10:19:31","guid":{"rendered":"https:\/\/afrikmag.com\/var\/www\/vhosts\/afrikmag.compublic_html\/?p=218608"},"modified":"2020-08-06T10:19:36","modified_gmt":"2020-08-06T10:19:36","slug":"cest-quoi-le-nitrate-dammonium-et-comment-a-t-il-provoque-une-explosion-devastatrice-a-beyrouth","status":"publish","type":"post","link":"https:\/\/afrikmag.com\/var\/www\/vhosts\/afrikmag.compublic_html\/cest-quoi-le-nitrate-dammonium-et-comment-a-t-il-provoque-une-explosion-devastatrice-a-beyrouth\/","title":{"rendered":"C&rsquo;est quoi le nitrate d&rsquo;ammonium et comment a-t-il provoqu\u00e9 une explosion d\u00e9vastatrice \u00e0 Beyrouth?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Les autorit\u00e9s libanaises ont d\u00e9clar\u00e9 que l&rsquo;explosion survenue mardi, 4 ao\u00fbt, \u00e0 Beyrouth a \u00e9t\u00e9 provoqu\u00e9e par un stock de plus de 2700 tonnes de nitrate d&rsquo;ammonium, confisqu\u00e9 et stock\u00e9 pendant environ six ans dans le port.\u00a0\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cependant, le pr\u00e9sident am\u00e9ricain Donald Trump conteste cette version officielle du gouvernement libanais.<\/p>\n\n\n\n<figure class=\"wp-block-embed-wordpress wp-block-embed is-type-wp-embed is-provider-afrikmag\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"6CmD22qpfA\"><a href=\"https:\/\/afrikmag.com\/var\/www\/vhosts\/afrikmag.compublic_html\/explosion-au-liban-donald-trump-fait-detonnantes-revelations\/\">Explosion au Liban : Donald Trump oppos\u00e9 \u00e0 la version officielle fait d&rsquo;\u00e9tonnantes r\u00e9v\u00e9lations<\/a><\/blockquote><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"\u00ab\u00a0Explosion au Liban : Donald Trump oppos\u00e9 \u00e0 la version officielle fait d\u2019\u00e9tonnantes r\u00e9v\u00e9lations\u00a0\u00bb \u2014 AfrikMag\" src=\"https:\/\/afrikmag.com\/var\/www\/vhosts\/afrikmag.compublic_html\/explosion-au-liban-donald-trump-fait-detonnantes-revelations\/embed\/#?secret=evB8fyG3tG#?secret=6CmD22qpfA\" data-secret=\"6CmD22qpfA\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Le nitrate d&rsquo;ammonium est une substance cristalline inodore couramment utilis\u00e9e comme engrais qui a \u00e9t\u00e9 \u00e0 l&rsquo;origine de nombreuses explosions industrielles au cours des d\u00e9cennies.\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le potentiel explosif du nitrate d&rsquo;ammonium est bien connu et a \u00e9galement \u00e9t\u00e9 utilis\u00e9 dans de nombreux attentats terroristes, y compris l&rsquo;attentat \u00e0 la bombe d&rsquo;Oklahoma City en 1995.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Qu&rsquo;est-ce que le nitrate d&rsquo;ammonium, pourquoi est-il explosif et pourquoi l&rsquo;utilisons-nous?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dans des conditions normales de stockage et sans chaleur tr\u00e8s \u00e9lev\u00e9e, il est difficile d&rsquo;enflammer le nitrate d&rsquo;ammonium, a d\u00e9clar\u00e9 Jimmie Oxley, professeur de chimie \u00e0 l&rsquo;Universit\u00e9 du Rhode Island.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00ab&nbsp;<em>Si vous regardez la vid\u00e9o (de l&rsquo;explosion de Beyrouth), vous avez vu la fum\u00e9e noire, vous avez vu la fum\u00e9e rouge, c&rsquo;\u00e9tait une r\u00e9action incompl\u00e8te\u00bb<\/em>, a-t-elle d\u00e9clar\u00e9 au Telegraph.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00ab&nbsp;<em>Je suppose qu&rsquo;il y a eu une petite explosion qui a d\u00e9clench\u00e9 la r\u00e9action du nitrate d&rsquo;ammonium &#8211; que cette petite explosion soit un accident ou quelque chose expr\u00e8s, je n&rsquo;ai pas encore entendu\u00a0\u00bb<\/em>, a-t-elle ajout\u00e9.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-embed-youtube wp-block-embed is-type-video is-provider-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\nhttps:\/\/m.youtube.com\/watch?v=771beHTMNxk\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Lorsqu&rsquo;il est combin\u00e9 avec des mazouts, le nitrate d&rsquo;ammonium cr\u00e9e un&nbsp;&nbsp;explosif puissant largement utilis\u00e9 par l&rsquo;industrie de la construction, mais aussi par des groupes insurg\u00e9s comme les Taliban pour les explosifs improvis\u00e9s.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En effet, le nitrate d&rsquo;ammonium est un oxydant &#8211; il intensifie la combustion et permet \u00e0 d&rsquo;autres substances de s&rsquo;enflammer plus facilement, mais n&rsquo;est pas en soi tr\u00e8s combustible.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En&nbsp;&nbsp;agriculture, l&rsquo;engrais au nitrate d&rsquo;ammonium est appliqu\u00e9 sous forme de granul\u00e9s et se dissout rapidement sous l&rsquo;humidit\u00e9, permettant \u00e0 l&rsquo;azote &#8211; qui est essentiel \u00e0 la croissance des plantes &#8211; d&rsquo;\u00eatre lib\u00e9r\u00e9 dans le sol.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les plantes d\u00e9pendent de la photosynth\u00e8se, convertissant la lumi\u00e8re du soleil en \u00e9nergie \u00e0 l&rsquo;aide de la chlorophylle.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L&rsquo;azote est un \u00e9l\u00e9ment essentiel&nbsp;&nbsp;pour ce processus et le nitrate d&rsquo;ammonium est particuli\u00e8rement bon, compar\u00e9 \u00e0 d&rsquo;autres engrais, \u00e0 fournir des \u00e9l\u00e9ments nutritifs aux plantes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le produit chimique est \u00e9galement un compos\u00e9 explosif et est utilis\u00e9 dans le monde entier dans les op\u00e9rations mini\u00e8res et de construction n\u00e9cessitant des d\u00e9tonations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dans des conditions normales, le produit chimique est tr\u00e8s stable.&nbsp;&nbsp;Il peut exploser apr\u00e8s exposition \u00e0 des contaminants ou au fioul puis chauff\u00e9, ce qui d\u00e9clenche une cascade de r\u00e9actions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Lorsqu&rsquo;il est chauff\u00e9 \u00e0 plus de 170 degr\u00e9s Fahrenheit, le nitrate d&rsquo;ammonium commence \u00e0 se d\u00e9composer.&nbsp;&nbsp;Mais avec un chauffage ou une d\u00e9tonation rapide, une r\u00e9action chimique peut se produire qui convertit le nitrate d&rsquo;ammonium en azote et en oxyg\u00e8ne gazeux et en vapeur d&rsquo;eau.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les produits de la r\u00e9action sont inoffensifs &#8211; ils se trouvent dans notre atmosph\u00e8re &#8211; mais le processus lib\u00e8re d&rsquo;\u00e9normes quantit\u00e9s d&rsquo;\u00e9nergie.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ian Rae, professeur \u00e0 l&rsquo;Universit\u00e9 de Melbourne, a \u00e9galement d\u00e9clar\u00e9 que lors de l&rsquo;explosion, tout le nitrate d&rsquo;ammonium n&rsquo;\u00e9tait pas \u00e9puis\u00e9 et explos\u00e9.&nbsp;&nbsp;Selon lui, une partie se d\u00e9compose lentement en cr\u00e9ant des gaz toxiques comme les oxydes d&rsquo;azote.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ce sont ces gaz qui sont responsables du panache de fum\u00e9e rouge-brun observ\u00e9e \u00e0 la suite de l&rsquo;explosion de Beyrouth, a d\u00e9clar\u00e9 Rae.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pour ces raisons, il existe g\u00e9n\u00e9ralement des r\u00e8gles tr\u00e8s strictes sur les lieux de stockage: par exemple, il doit \u00eatre tenu \u00e0 l&rsquo;\u00e9cart des combustibles et des sources de chaleur.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En fait, de nombreux pays de l&rsquo;Union europ\u00e9enne exigent que le carbonate de calcium soit ajout\u00e9 au nitrate d&rsquo;ammonium pour cr\u00e9er du nitrate de calcium et d&rsquo;ammonium, qui est plus s\u00fbr.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Aux \u00c9tats-Unis, la r\u00e9glementation a \u00e9t\u00e9 consid\u00e9rablement durcie apr\u00e8s l&rsquo;attaque d&rsquo;Oklahoma City.&nbsp;&nbsp;En vertu des normes antiterroristes des installations chimiques, par exemple, les installations qui stockent plus de 2 000 livres (900 kilogrammes) de nitrate d&rsquo;ammonium sont soumises \u00e0 des inspections.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Malgr\u00e9 ses dangers, Oxley a d\u00e9clar\u00e9 que les utilisations l\u00e9gitimes du nitrate d&rsquo;ammonium dans l&rsquo;agriculture et la construction l&rsquo;ont rendu indispensable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00ab&nbsp;<em>Nous n&rsquo;aurions pas ce monde moderne sans explosifs et nous ne nourririons pas la population que nous avons aujourd&rsquo;hui sans engrais au nitrate d&rsquo;ammonium \u00bb<\/em>, a-t-elle d\u00e9clar\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u00ab&nbsp;<em>Nous avons besoin de nitrate d&rsquo;ammonium, nous devons juste faire bien attention \u00e0 ce que nous en faisons\u00a0\u00bb<\/em>, a-t-elle ajout\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En 2015, des explosions caus\u00e9es en partie par la d\u00e9tonation d&rsquo;environ 800 tonnes de nitrate d&rsquo;ammonium ont secou\u00e9 le port de P\u00e9kin de Tianjin, tuant&nbsp;&nbsp;173 personnes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Une explosion de nitrate d&rsquo;ammonium a \u00e9t\u00e9 responsable du pire accident industriel de l&rsquo;histoire des \u00c9tats-Unis en 1947.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Un navire dans le port de Texas City, transportant environ 2 300 tonnes de nitrate d&rsquo;ammonium, a pris feu, soi-disant par une cigarette jet\u00e9e, provoquant une s\u00e9rie d\u2019explosions qui ont tu\u00e9 581 personnes.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les autorit\u00e9s libanaises ont d\u00e9clar\u00e9 que l&rsquo;explosion survenue mardi, 4 ao\u00fbt, \u00e0 Beyrouth a \u00e9t\u00e9 provoqu\u00e9e par un stock de plus de 2700 tonnes de nitrate d&rsquo;ammonium, confisqu\u00e9 et stock\u00e9 pendant environ six ans dans le port.\u00a0\u00a0 Cependant, le pr\u00e9sident am\u00e9ricain Donald Trump conteste cette version officielle du gouvernement libanais. Explosion au Liban : Donald &hellip;<\/p>\n","protected":false},"author":37,"featured_media":218653,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7020],"tags":[179966,4339,2903],"class_list":["post-218608","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-societe","tag-beyrouth","tag-explosion","tag-liban"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>C&#039;est quoi le nitrate d&#039;ammonium et comment a-t-il provoqu\u00e9 une explosion d\u00e9vastatrice \u00e0 Beyrouth?<\/title>\n<meta name=\"description\" content=\"Les autorit\u00e9s libanaises ont d\u00e9clar\u00e9 que l&#039;explosion de Beyrouth le mardi 4 ao\u00fbt \u00e9tait aliment\u00e9e par un stock de plus de 2700 tonnes de nitrate d&#039;ammonium\" \/>\n<meta name=\"robots\" content=\"index, follow, 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