{"id":4874,"date":"2020-09-17T08:28:48","date_gmt":"2020-09-17T08:28:48","guid":{"rendered":"http:\/\/www.alalloycasting.com\/?p=4874"},"modified":"2026-09-29T02:15:16","modified_gmt":"2026-09-29T02:15:16","slug":"purification-of-aluminum","status":"publish","type":"post","link":"https:\/\/www.alalloycasting.com\/es\/purification-of-aluminum\/","title":{"rendered":"Purification of Aluminum\uff1aMethods for Hydrogen and Inclusion Removal"},"content":{"rendered":"

Aluminum melt purification removes dissolved hydrogen and non-metallic inclusions before casting. These contaminants can contribute to gas porosity, oxide-related defects and internal cleanliness problems in billets, slabs and other cast products. The required melt quality depends on the alloy, casting process and final application. In practice, aluminum melt purification usually combines degassing, inclusion removal, filtration and process control<\/strong> rather than relying on a single treatment method.<\/p>\n

\"purificaci\u00f3n
purificaci\u00f3n del aluminio fundido<\/em><\/figcaption><\/figure>\n

Why Is Aluminum Melt Purification Important?<\/h2>\n

Molten aluminum can contain dissolved hydrogen as well as non-metallic inclusions generated during melting, alloying, holding and metal transfer. If these contaminants are not adequately controlled before casting, they can affect the internal quality of the solidified metal.<\/p>\n

Hydrogen is particularly important because its solubility changes significantly between liquid and solid aluminum. As the metal solidifies, excess hydrogen can form gas pores when it cannot escape from the melt. Non-metallic inclusions, meanwhile, can become trapped inside the casting and may remain through subsequent rolling, extrusion or forging.<\/p>\n

The resulting defects can affect mechanical properties, fatigue performance, surface quality, corrosion behavior and downstream processing.<\/p>\n\n\n\n\n\n\n\n\n
Melt contaminant<\/th>\nTypical source<\/th>\nPotential casting problem<\/th>\nMain control method<\/th>\n<\/tr>\n<\/thead>\n
Hidr\u00f3geno disuelto<\/td>\nMoisture and furnace atmosphere<\/td>\nGas porosity<\/td>\nDesgasificaci\u00f3n<\/td>\n<\/tr>\n
Pel\u00edculas de \u00f3xido<\/td>\nMetal-air reaction and turbulence<\/td>\nInternal defects, reduced ductility<\/td>\nMelt cleaning and filtration<\/td>\n<\/tr>\n
Inclusiones no met\u00e1licas<\/td>\nOxides, refractory particles and process contamination<\/td>\nDefectos de inclusi\u00f3n<\/td>\nFiltraci\u00f3n con espuma cer\u00e1mica<\/td>\n<\/tr>\n
Surface dross<\/td>\nOxidation and melt handling<\/td>\nMetal loss and contamination<\/td>\nSkimming and controlled handling<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The target is therefore not simply \u201chigh-purity aluminum.\u201d It is a molten metal condition appropriate for the alloy and final product<\/strong>.<\/p>\n

\"\"<\/p>\n

What Does Aluminum Melt Purification Remove?<\/h2>\n

Aluminum purification is often discussed as if all impurities can be removed by the same process. They cannot.<\/p>\n

Dissolved hydrogen, solid inclusions, surface oxides and unwanted chemical elements require different treatment mechanisms.<\/p>\n

Desgasificaci\u00f3n<\/strong> is primarily used to reduce dissolved hydrogen.
\nFiltraci\u00f3n<\/strong> physically removes solid non-metallic inclusions.
\nFlux treatment<\/strong> can assist with hydrogen removal, inclusion separation and oxide\/dross management depending on the formulation.
\nAlloy and impurity control<\/strong> addresses elements that cannot simply be removed by a ceramic filter or inert-gas treatment.<\/p>\n

This distinction is important when designing a melt-treatment system because improving one quality parameter does not automatically correct another.<\/p>\n

How Is Molten Aluminum Degassed?<\/h2>\n

Degassing removes dissolved hydrogen by increasing the contact between the molten metal and a gas phase with a low hydrogen concentration.<\/p>\n

In rotary degassing, an inert gas such as nitrogen or argon is introduced through a rotating shaft and rotor. The rotor disperses the gas into fine bubbles throughout the melt. Hydrogen then transfers from the liquid aluminum into the bubbles, which rise to the surface and leave the melt.<\/p>\n

The efficiency of this process depends on more than gas flow rate. Rotor design, rotational speed, immersion depth, treatment time, melt temperature and bubble dispersion all influence the gas-metal contact area.<\/p>\n

A typical melt-treatment sequence may therefore be:<\/p>\n

Melting \u2192 alloy adjustment \u2192 holding \u2192 rotary degassing \u2192 filtration \u2192 casting<\/strong><\/p>\n

Industrial casthouses commonly combine degassing and ceramic foam filtration. Hydro, for example, describes treating aluminum inline with degassing and a ceramic foam filter to achieve low hydrogen levels and high metal cleanliness in forging stock production.<\/p>\n

What Is Flux Treatment in Aluminum Melt Purification?<\/h2>\n

Flux treatment uses a formulated mixture of salts introduced into molten aluminum to promote specific refining reactions.<\/p>\n

Depending on the flux composition and application, fluxes can assist in removing hydrogen, separating inclusions and modifying dross behavior. Granular or powdered flux may be added into the melt using suitable injection or immersion equipment.<\/p>\n

Flux treatment should not be considered interchangeable with inert-gas rotary degassing. The chemical mechanism, operating conditions and resulting melt behavior are different.<\/p>\n\n\n\n\n\n\n\n\n
Treatment<\/th>\nPrimary mechanism<\/th>\nMain purpose<\/th>\n<\/tr>\n<\/thead>\n
Desgasificaci\u00f3n rotativa<\/td>\nGas-metal mass transfer<\/td>\nHydrogen removal<\/td>\n<\/tr>\n
Refinado por fundente<\/td>\nChemical and physical reactions<\/td>\nMelt refining and inclusion separation<\/td>\n<\/tr>\n
Filtraci\u00f3n con espuma cer\u00e1mica<\/td>\nPhysical interception<\/td>\nSolid inclusion removal<\/td>\n<\/tr>\n
Skimming<\/td>\nSurface separation<\/td>\nDross removal<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The choice depends on alloy chemistry, furnace configuration, melt volume, production rate and required metal cleanliness.<\/p>\n

How Does Ceramic Foam Filtration Purify Molten Aluminum?<\/h2>\n

Ceramic foam filtration removes solid non-metallic inclusions as molten aluminum passes through a porous ceramic filter.<\/p>\n

Unlike degassing, the primary purpose of a ceramic foam filter is not to remove dissolved hydrogen<\/strong>. Instead, the three-dimensional pore structure promotes the separation and retention of solid inclusions from the metal stream.<\/p>\n

Depending on filter design and operating conditions, inclusions can be retained through a combination of mechanisms including direct interception, attachment to the ceramic surface and changes in flow through the porous structure.<\/p>\n

Ceramic foam filters are commonly installed in filter boxes or other filtration assemblies between melt treatment and casting.<\/p>\n\n\n\n\n\n\n\n\n\n\n
Filtration factor<\/th>\nWhy it matters<\/th>\n<\/tr>\n<\/thead>\n
PPI<\/td>\nInfluences pore structure and filtration behavior<\/td>\n<\/tr>\n
Tama\u00f1o del filtro<\/td>\nDetermines available filtration area and metal throughput<\/td>\n<\/tr>\n
Material cer\u00e1mico<\/td>\nMust withstand the alloy and operating temperature<\/td>\n<\/tr>\n
Caudal de metal<\/td>\nAffects residence time and pressure drop<\/td>\n<\/tr>\n
Carga de inclusi\u00f3n<\/td>\nDetermines filter service life and performance<\/td>\n<\/tr>\n
Installation<\/td>\nPoor sealing can allow unfiltered metal to bypass the filter<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Filter selection therefore cannot be reduced to choosing the highest PPI available. The filter must provide an appropriate balance between inclusion removal, metal flow, pressure drop, capacity and casting requirements.<\/p>\n

What Is the Difference Between Degassing and Filtration?<\/h2>\n

Degassing and filtration solve different melt-quality problems.<\/p>\n

The simplest distinction is:<\/p>\n

Degassing removes dissolved gas; filtration removes solid inclusions.<\/strong><\/p><\/blockquote>\n

This distinction is particularly important in billet and slab casting. A melt may have an acceptable hydrogen level while still containing excessive non-metallic inclusions. Conversely, a highly efficient filter cannot remove dissolved hydrogen from the metal before solidification.<\/p>\n

For this reason, demanding applications often use the two processes together.<\/p>\n\n\n\n\n\n\n\n\n\n
Quality problem<\/th>\nDesgasificaci\u00f3n<\/th>\nFiltraci\u00f3n con espuma cer\u00e1mica<\/th>\n<\/tr>\n<\/thead>\n
Hidr\u00f3geno disuelto<\/td>\nPrimary function<\/td>\nNot the primary function<\/td>\n<\/tr>\n
Oxide inclusions<\/td>\nLimited secondary effect<\/td>\nPrimary function<\/td>\n<\/tr>\n
Solid non-metallic particles<\/td>\nLimitado<\/td>\nPrimary function<\/td>\n<\/tr>\n
Gas porosity risk<\/td>\nDirectly addresses hydrogen contribution<\/td>\nDoes not directly remove dissolved hydrogen<\/td>\n<\/tr>\n
Pureza de la masa fundida<\/td>\nContributes indirectly<\/td>\nDirectly improves inclusion cleanliness<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Hydro’s production descriptions also illustrate this combined approach: aluminum billet production can use degassing followed by filtration before Direct Chill casting<\/strong>.<\/p>\n

What Is the Best Aluminum Melt Purification Method?<\/h2>\n

There is no single purification method that is appropriate for every aluminum alloy or casting operation.<\/p>\n

The required treatment depends on the starting melt condition and the quality target.<\/p>\n

For a production line with a significant hydrogen problem, the priority may be effective rotary degassing. If hydrogen is already controlled but inclusion levels remain high, filtration becomes more important. Where both dissolved hydrogen and non-metallic inclusions must be tightly controlled, combining degassing with ceramic foam filtration provides a more complete melt-treatment route.<\/p>\n\n\n\n\n\n\n\n\n\n\n
Production requirement<\/th>\nSuitable treatment approach<\/th>\n<\/tr>\n<\/thead>\n
Reduce dissolved hydrogen<\/td>\nRotary inert-gas degassing<\/td>\n<\/tr>\n
Remove non-metallic inclusions<\/td>\nFiltraci\u00f3n con espuma cer\u00e1mica<\/td>\n<\/tr>\n
Improve overall melt cleanliness<\/td>\nDegassing + filtration<\/td>\n<\/tr>\n
Control surface dross<\/td>\nFlux treatment + skimming<\/td>\n<\/tr>\n
High-quality billet production<\/td>\nControlled degassing + filtration + casting control<\/td>\n<\/tr>\n
High inclusion sensitivity<\/td>\nOptimized melt treatment + high-efficiency filtration<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The treatment should also be designed around the entire melt path<\/strong>, not only the purification station. Hydrogen or inclusions can be reintroduced after treatment through excessive turbulence, poor transfer practices, contaminated tools, refractory interaction or other sources.<\/p>\n

How Can Aluminum Melt Purification Be Controlled?<\/h2>\n

A stable purification process requires measurable process parameters rather than relying only on visual inspection.<\/p>\n

Hydrogen concentration can be measured before and after degassing, while inclusion cleanliness can be evaluated using appropriate metallurgical inspection and inclusion-analysis methods. Industrial aluminum producers use techniques such as hydrogen measurement and inclusion evaluation to monitor melt quality.<\/p>\n

Important process variables include:<\/p>\n

    \n
  • Temperatura de fusi\u00f3n<\/li>\n
  • Hydrogen concentration before and after treatment<\/li>\n
  • Gas type and flow rate<\/li>\n
  • Rotor speed and immersion depth<\/li>\n
  • Degassing time<\/li>\n
  • Filter type and filtration area<\/li>\n
  • Caudal de metal<\/li>\n
  • Pressure drop across the filter<\/li>\n
  • Carga de inclusi\u00f3n<\/li>\n
  • Time between treatment and casting<\/li>\n<\/ul>\n

    The purpose of monitoring these parameters is not simply to produce a low hydrogen number. The objective is to maintain a stable melt condition from treatment through casting<\/strong>.<\/p>\n

    Why Should Degassing and Filtration Be Used Together?<\/h2>\n

    Hydrogen removal and inclusion removal are related but separate parts of melt purification.<\/p>\n

    A well-controlled process therefore treats them as complementary operations:<\/p>\n

    Prevent contamination \u2192 melt and alloy \u2192 degas \u2192 filter \u2192 cast<\/strong><\/p>\n

    This approach is particularly relevant when producing aluminum billet, slab, forging stock, extrusion feedstock and other products where internal metal cleanliness affects downstream processing.<\/p>\n

    AdTech’s aluminum melt-treatment solutions include rotary degassing equipment and ceramic foam filtration systems designed to address these two major aspects of melt purification. The exact configuration should be selected according to the alloy, melt capacity, casting method and required metal quality.<\/p>\n

    What Determines the Required Level of Aluminum Melt Purity?<\/h2>\n

    The required melt quality is ultimately determined by the alloy, product and downstream process<\/strong>.<\/p>\n

    A general-purpose casting does not necessarily require the same hydrogen and inclusion limits as extrusion billet, forging stock or material intended for demanding surface finishing.<\/p>\n

    For example, Hydro specifies hydrogen below 0.2 mL H\u2082\/100 g Al for certain forging-stock products, illustrating how a numerical hydrogen target can be tied to a specific product specification rather than treated as a universal limit for all aluminum melts.<\/p>\n

    The practical objective of aluminum melt purification is therefore not to pursue an arbitrary purity number. It is to establish a controlled combination of hydrogen level, inclusion cleanliness, alloy chemistry and casting conditions<\/strong> that meets the requirements of the finished product.<\/p>\n

     <\/p>\n

     <\/p>\n

     <\/p>\n

    <\/div>","protected":false},"excerpt":{"rendered":"

    Aluminum melt purification removes dissolved hydrogen and non-metallic inclusions before casting. These contaminants can contribute to gas porosity, oxide-related defects and internal cleanliness problems in…<\/p>","protected":false},"author":1,"featured_media":4875,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[233],"tags":[4695],"class_list":["post-4874","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-purification-of-aluminum"],"yoast_head":"\nPurification of Aluminum Liquid in Casting Process<\/title>\n<meta name=\"description\" content=\"Purification of aluminum is the key to reducing the gas content and non-metallic inclusions and improving the quality of processed materials.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.alalloycasting.com\/es\/purification-of-aluminum\/\" \/>\n<meta property=\"og:locale\" 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