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{"id":1289,"date":"2020-08-30T08:54:45","date_gmt":"2020-08-30T06:54:45","guid":{"rendered":"https:\/\/primateria.art\/?post_type=portfolio&p=1289"},"modified":"2020-09-13T23:12:23","modified_gmt":"2020-09-13T21:12:23","slug":"extraction-dalcali-par-lixiviation-de-cendre-de-bois","status":"publish","type":"portfolio","link":"https:\/\/primateria.art\/pratiques\/extraction-dalcali-par-lixiviation-de-cendre-de-bois\/","title":{"rendered":"Extraction d’alcali par lixiviation de cendre de bois"},"content":{"rendered":"La cendre issue de la combustion de v\u00e9g\u00e9taux est riche en min\u00e9raux dont des sels alcalins solubles dans l’eau. Leurs proportions varient suivant les plantes utilis\u00e9es.
Les alcalis sont dissous par une lixiviation (lessivage) produisant une lessive de cendre. Apr\u00e8s d\u00e9shydratation compl\u00e8te, on obtient de la potasse ou de la soude en fonction de la mati\u00e8re premi\u00e8re des cendres. Encore impure, on peut la raffiner par combustion des mati\u00e8res organiques r\u00e9siduelles.
La potasse trouve de multiples utilisations. Elle s’emploie principalement dans la fabrication de savon, comme fondant pour la fabrication de c\u00e9ramique ou de verre, comme engrais, pour le blanchiment ou les teintures des textiles<\/a> ou encore dans la pr\u00e9paration de p\u00e2te \u00e0 papier<\/a>. La lessive de cendre peut s’utiliser en tant que telle comme nettoyant d\u00e9graissant.<\/p>","protected":false},"excerpt":{"rendered":"La cendre issue de la combustion de v\u00e9g\u00e9taux est riche en min\u00e9raux dont des sels alcalins solubles dans l’eau. Leurs proportions varient suivant les plantes utilis\u00e9es.Les alcalis sont dissous par une lixiviation (lessivage) produisant une lessive de cendre. Apr\u00e8s d\u00e9shydratation … Lire la suite\u00ad\u00ad<\/a><\/p>\n","protected":false},"author":1,"featured_media":1293,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"seo_booster_metabox":"","kt_blocks_editor_width":""},"portfolio-type":[26],"class_list":["post-1289","portfolio","type-portfolio","status-publish","has-post-thumbnail","hentry","portfolio-type-transformations"],"_links":{"self":[{"href":"https:\/\/primateria.art\/wp-json\/wp\/v2\/portfolio\/1289","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/primateria.art\/wp-json\/wp\/v2\/portfolio"}],"about":[{"href":"https:\/\/primateria.art\/wp-json\/wp\/v2\/types\/portfolio"}],"author":[{"embeddable":true,"href":"https:\/\/primateria.art\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/primateria.art\/wp-json\/wp\/v2\/comments?post=1289"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/primateria.art\/wp-json\/wp\/v2\/media\/1293"}],"wp:attachment":[{"href":"https:\/\/primateria.art\/wp-json\/wp\/v2\/media?parent=1289"}],"wp:term":[{"taxonomy":"portfolio-type","embeddable":true,"href":"https:\/\/primateria.art\/wp-json\/wp\/v2\/portfolio-type?post=1289"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}