{"id":18376,"date":"2021-10-14T14:16:35","date_gmt":"2021-10-14T06:16:35","guid":{"rendered":"https:\/\/www.jxscmachine.com\/?post_type=new&#038;p=18376"},"modified":"2026-04-22T14:03:25","modified_gmt":"2026-04-22T06:03:25","slug":"la-flottation-du-minerai-de-magnesite","status":"publish","type":"new","link":"https:\/\/www.jxscmachine.com\/fr\/new\/whats-magnesite-ore-flotation\/","title":{"rendered":"Qu'est-ce que le minerai de magn\u00e9site et comment le faire flotter ?"},"content":{"rendered":"<h2>What&#8217;s Magnesite Ore?<\/h2>\n<p><strong>Magnesite (MgCO\u2083)<\/strong> is a crucial industrial mineral that serves as the primary source of magnesium &#8211; a vital element in modern manufacturing and refractory applications. Initially valued for its refractory properties, magnesite has evolved into an essential raw material across multiple industries, from construction to military applications.<\/p>\n<h3>Key Characteristics of Magnesite<\/h3>\n<p><strong>Chemical Composition<\/strong><\/p>\n<ul>\n<li>Chemical formula: MgCO\u2083<\/li>\n<li>Theoretical composition: MgO 47.81%, CO\u2082 52.19%<\/li>\n<li>Density: 2.9-3.1 g\/cm\u00b3<\/li>\n<li>Mohs hardness: 3-5<\/li>\n<\/ul>\n<p><strong>Crystal Forms: Magnesite occurs in two primary forms<\/strong><\/p>\n<ul>\n<li><strong>Crystalline magnesite:<\/strong>&nbsp;Rhombohedral, columnar, platy, granular, compact, earthy, or fibrous forms. Often contains isomorphic substitutions of calcium and manganese, with Fe\u00b2\u207a potentially replacing Mg\u00b2\u207a to form a solid solution series with siderite (FeCO\u2083).<\/li>\n<li><strong>Amorphous magnesite:<\/strong>&nbsp;Gel-like structure, typically stalactitic, lacking luster and cleavage, with conchoidal fracture.<\/li>\n<\/ul>\n<h3>Global Significance of Magnesite<\/h3>\n<ul>\n<li><strong>Resource Dominance:<\/strong>&nbsp;China holds about two-thirds of global magnesite reserves and produces half of the world&#8217;s supply<\/li>\n<li><strong>Market Position:<\/strong>&nbsp;China plays a pivotal role in international magnesite trade<\/li>\n<li><strong>Industrial Value Chain:<\/strong> From raw ore to processed products, magnesite serves as a foundation for multiple industrial processes<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-18380\" src=\"https:\/\/www.jxscmachine.com\/wp-content\/uploads\/2021\/10\/Magnesite-ore.jpg\" alt=\"Minerai de magn\u00e9site\" width=\"839\" height=\"508\" srcset=\"https:\/\/www.jxscmachine.com\/wp-content\/uploads\/2021\/10\/Magnesite-ore.jpg 839w, https:\/\/www.jxscmachine.com\/wp-content\/uploads\/2021\/10\/Magnesite-ore-768x465.jpg 768w\" sizes=\"auto, (max-width: 839px) 100vw, 839px\" \/><\/p>\n<h3>Magnesite Calcination Products and Applications<\/h3>\n<p>When heated to different temperatures(magnesite is heated to above 640\u00b0C, it begins to decompose into magnesium oxide and carbon dioxide), magnesite (MgCO\u2083) decomposes into various forms of magnesia (MgO),<strong> each with distinct properties and industrial applications:<\/strong><\/p>\n<h4>1. Light-Burned Magnesia (700\u20131000\u00b0C)<\/h4>\n<p>When calcined at 700\uff5e1000\u2103, the carbon dioxide does not completely escape and becomes a powdery substance called light burnt magnesia (<strong>also called caustic magnesia, calcined magnesia, \u03b1-magnesium, chalcogenite<\/strong>)<\/p>\n<p><strong>Properties<\/strong><\/p>\n<ul>\n<li>Powdered form with residual CO\u2082<\/li>\n<li>Highly reactive and adhesive<\/li>\n<li>Reacts with water to form magnesium hydroxide<\/li>\n<\/ul>\n<p><strong>Applications<\/strong><\/p>\n<ul>\n<li><strong>Cement &amp; Construction:<\/strong> Such as magnesium-containing cement, heat, and sound insulation building materials.<\/li>\n<li><strong>Ceramics &amp; Chemicals:<\/strong> After the light burns, magnesium is chemically treated, and it can be made into a variety of magnesium salts, which can be used as raw materials for medicine, rubber, man-made fibers, and papermaking.<\/li>\n<\/ul>\n<h4>2. Dead-Burned Magnesia (1400\u20131800\u00b0C)<\/h4>\n<p>When calcined at 1400\uff5e1800\u2103, carbon dioxide completely escapes, and magnesia forms a compact periclase mass. Weigh burnt magnesia (<strong>also known as hard burnt magnesia, dead burnt magnesia, \u03b2-magnesium, etc.<\/strong>).<\/p>\n<p><strong>Properties<\/strong><\/p>\n<ul>\n<li>Fully decomposed (CO\u2082 totally removed)<\/li>\n<li>Forms dense periclase crystals<\/li>\n<li>High refractoriness and chemical resistance<\/li>\n<li style=\"list-style-type: none;\">&nbsp;<\/li>\n<\/ul>\n<p><strong>Applications<\/strong><\/p>\n<ul>\n<li><strong>Refractory material for metallurgy: <\/strong>Magnesia bricks, chrome-magnesia bricks, metallurgical powders<\/li>\n<\/ul>\n<h4>3. Fused Magnesia (2500\u20133000\u00b0C)<\/h4>\n<p>The recalcined magnesia is melted at 2500\uff5e3000\u2103, and after cooling and solidification, it develops into a perfect periclase crystal, called <strong>fused magnesia or molten magnesia<\/strong>.<\/p>\n<p><strong>Properties<\/strong><\/p>\n<ul>\n<li>Fully crystallized periclase structure<\/li>\n<li>Extremely hard, water-resistant, chemically inert<\/li>\n<li>High electrical resistivity<\/li>\n<li style=\"list-style-type: none;\">&nbsp;<\/li>\n<\/ul>\n<p><strong>Applications<\/strong><\/p>\n<ul>\n<li><strong>High-Temperature Furnaces:<\/strong>&nbsp;Linings, crucibles for alloy steel\/non-ferrous metal smelting<\/li>\n<li><strong>Insulation &amp; Electronics:<\/strong> High-temperature electrical insulation<\/li>\n<li style=\"list-style-type: none;\">&nbsp;<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>Magnesium metal can be extracted from magnesite by electrolysis, reduction, etc. Magnesium has the characteristics of being lightweight (the weight is only 2\/3 of aluminum), active chemical properties, and good electrical and heat transfer performance. It can be fused with other metals to form a variety of alloys with low specific gravity, high strength, and good mechanical properties. It is widely used in the Military industry and the cutting-edge industry. Since magnesium is easy to oxidize and burn in the air to give off a strong light, magnesium powder can be used to make flares and incendiary bombs. Magnesium can also be used as a reducing agent for smelting titanium, zirconium, uranium, and beryllium, and as a spheroidizing agent for ductile iron and a desulfurizing agent for steel in the iron and steel industry.<\/p>\n<p>&nbsp;<\/p>\n<h3>Normes de qualit\u00e9 pour les produits de magn\u00e9site<\/h3>\n<p><strong>Les exigences relatives \u00e0 la taille des particules des produits de magn\u00e9site sont les suivantes :<\/strong><\/p>\n<ul>\n<li><strong>25~100mm:<\/strong> no more than 15% for those smaller than 25mm, no more than 10% for those larger than 100mm, and the maximum particle size is no more than 120mm.<\/li>\n<li><strong>No more than 10% for those larger than 40mm,<\/strong> and the maximum particle size is not larger than 60mm.<\/li>\n<li><strong>0~25mm:<\/strong> no more than 10% for those larger than 25mm, and the maximum particle size is no more than 40mm.<\/li>\n<li><strong>50~80mm<\/strong> (for reverberatory kiln roasting light-burned magnesia powder): no more than 15% for those smaller than 50mm, no more than 10% for those larger than 180mm, and the maximum particle size is no more than 200mm.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<table style=\"width: 100%;\" border=\"1\">\n<tbody>\n<tr>\n<td style=\"text-align: center; width: 100%;\" colspan=\"4\"><strong>Normes de qualit\u00e9 pour les produits de magn\u00e9site<\/strong><\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\" rowspan=\"2\">Grade<\/td>\n<td style=\"text-align: center;\" colspan=\"3\">Composition chimique Contenu (%)<\/td>\n<\/tr>\n<tr>\n<td>MgO n'est pas inf\u00e9rieur \u00e0<\/td>\n<td>CaO pas plus de<\/td>\n<td>SiO<sub>2<\/sub>&nbsp;n'est pas sup\u00e9rieur \u00e0<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">Extraordinaire<\/td>\n<td>47<\/td>\n<td>0.6<\/td>\n<td style=\"text-align: center;\">0.6<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">Premi\u00e8re ann\u00e9e<\/td>\n<td>46<\/td>\n<td>0.8<\/td>\n<td style=\"text-align: center;\">1.2<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">Deuxi\u00e8me ann\u00e9e<\/td>\n<td>45<\/td>\n<td>1.5<\/td>\n<td style=\"text-align: center;\">1.5<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">Troisi\u00e8me ann\u00e9e<\/td>\n<td>43<\/td>\n<td>1.5<\/td>\n<td style=\"text-align: center;\">3.5<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">Quatri\u00e8me ann\u00e9e<\/td>\n<td>41<\/td>\n<td>6<\/td>\n<td style=\"text-align: center;\">2<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center;\">Magn\u00e9site<\/td>\n<td>33<\/td>\n<td>6<\/td>\n<td style=\"text-align: center;\">4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<h2>Processus de flottation de la magn\u00e9site<\/h2>\n<p>&nbsp;<\/p>\n<h3>Overview of Beneficiation Methods<\/h3>\n<p>Magnesite is a carbonate mineral. We&nbsp;mainly adopt the <strong>direct flotation process and reverse flotation process<\/strong> to beneficiate magnesite.<\/p>\n<p><strong>Application Guidelines: <\/strong>The reverse flotation process is suitable for <strong>high-grade ores<\/strong> with less calcium and iron (Fe). <strong>For low-grade ore,<\/strong> we&nbsp;combine these two methods. The reverse flotation process removes silicon-containing materials, while the direct flotation process removes calcium and iron (Fe)-containing materials.<\/p>\n<p>&nbsp;<\/p>\n<h3>Complete Flotation Process Breakdown<\/h3>\n<h4>Concassage et broyage&nbsp;<\/h4>\n<p><strong>Broyage :<\/strong> Le minerai brut (moins de 200 mm) est concass\u00e9 \u00e0 10~0 mm par un proc\u00e9d\u00e9 en circuit ferm\u00e9 \u00e0 deux \u00e9tapes comprenant un broyeur de minerais. <a href=\"https:\/\/www.jxscmachine.com\/fr\/concasseur-de-roches\/concasseur-a-machoires\/\">concasseur \u00e0 m\u00e2choires<\/a> et un <a href=\"https:\/\/www.jxscmachine.com\/fr\/classer\/ecran-vibrant\/\">\u00e9cran vibrant<\/a>.<\/p>\n<p><strong>Broyage :<\/strong> Closed-circuit grinding of the broken ore, grind the ore to -200mm 70%, and then enter the flotation process.<\/p>\n<p>&nbsp;<\/p>\n<h4>Phase de s\u00e9paration<\/h4>\n<p>\u00c0 ce stade, l'\u00e9quipement principal est un <a href=\"https:\/\/www.jxscmachine.com\/fr\/equipement-de-flottation\/machine-de-flottation\/\">machine de flottation<\/a>, a stirring tank, thickener. The following two methods are the magnesite flotation process designed by us.<\/p>\n<h5><strong>Proc\u00e9d\u00e9 de flottation de la magn\u00e9site \u00e0 haute teneur<\/strong><\/h5>\n<p>The ground ore is sent to a stirring tank and mixed with the flotation agent. Reverse flotation will get the concentrate puree. The pulp will then be transported to the thickener to reduce moisture.<\/p>\n<h5><strong>Proc\u00e9d\u00e9 de flottation de la magn\u00e9site \u00e0 faible teneur<\/strong><\/h5>\n<p>Only the reverse flotation process is used, and the impurities in the raw ore cannot be removed. Therefore, for low-grade magnesite, we usually combine two methods, namely the reverse flotation process (one roughing-one cleaning) and the direct flotation process (one roughing-one cleaning). In the reverse flotation process, part of the tailings is separated, and at the same time, the concentrate and intermediate products are obtained by direct flotation.<\/p>\n<h2>Environmental Considerations<\/h2>\n<p><strong>Modern magnesite processing emphasizes:<\/strong><\/p>\n<ul>\n<li>Water recycling systems<\/li>\n<li>Tailings management<\/li>\n<li>Dust control measures<\/li>\n<li>Energy-efficient thermal processing<\/li>\n<\/ul>\n<p>This comprehensive approach ensures sustainable production while meeting the stringent quality standards required by global industries.<\/p>\n<p><strong>Our Magnesite Case:<\/strong> <a href=\"https:\/\/www.jxscmachine.com\/fr\/cas\/100tph-diamond-washing-plant-south-africa-11\/\">Installation de lavage et de criblage de magn\u00e9site de 200 TPH en Tanzanie<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>What&#8217;s Magnesite Ore? Magnesite (MgCO\u2083) is a crucial industrial mineral that serves as the primary source of magnesium &#8211; a vital element in modern manufacturing and refractory applications. Initially valued for its refractory properties, magnesite has evolved into an essential raw material across multiple industries, from construction to military applications. Key Characteristics of Magnesite Chemical &hellip; <a href=\"https:\/\/www.jxscmachine.com\/fr\/new\/whats-magnesite-ore-flotation\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Qu'est-ce que le minerai de magn\u00e9site et comment le faire flotter ?<\/span><\/a><\/p>","protected":false},"author":1,"featured_media":18380,"parent":0,"menu_order":205,"comment_status":"closed","ping_status":"open","template":"","format":"standard","meta":{"_acf_changed":false,"ngg_post_thumbnail":0,"footnotes":""},"categories":[],"tags":[],"class_list":["post-18376","new","type-new","status-publish","format-standard","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What\u2019s Magnesite Ore and How to Flotation it? - JXSC Machine<\/title>\n<meta name=\"description\" content=\"Magnesite is a crucial industrial mineral that serves as the primary source of magnesium. 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