{"id":711,"date":"2020-04-09T09:22:46","date_gmt":"2020-04-09T09:22:46","guid":{"rendered":"http:\/\/alalloycasting.com\/?page_id=711"},"modified":"2026-08-18T01:55:53","modified_gmt":"2026-08-18T01:55:53","slug":"deslagging-flux","status":"publish","type":"page","link":"https:\/\/www.alalloycasting.com\/ru\/deslagging-flux\/","title":{"rendered":"\u0424\u043b\u044e\u0441 \u0434\u043b\u044f \u0443\u0434\u0430\u043b\u0435\u043d\u0438\u044f \u0448\u043b\u0430\u043a\u0430"},"content":{"rendered":"

Drossing flux is also known as a deslagging flux in aluminum melt treatment. It is mainly used to separate metallic aluminum from oxide dross, reduce metal loss during slag removal, and improve melt recovery efficiency. Unlike refining fluxes that focus on hydrogen and inclusion removal, drossing flux works primarily on the slag-metal separation process during aluminum melting and casting.<\/p>\n

\"\u043e\u0447\u0438\u0449\u0430\u044e\u0449\u0438\u0439
\u043e\u0447\u0438\u0449\u0430\u044e\u0449\u0438\u0439 \u0444\u043b\u044e\u0441<\/em><\/figcaption><\/figure>\n

What Is Drossing Flux and Why Is It Used in Aluminum Casting?<\/h2>\n

Drossing flux is a chemical treatment material designed for removing and treating aluminum dross generated during melting operations. In the aluminum industry, dross<\/strong> is not simply waste material. It is a mixture of aluminum oxide, other non-metallic compounds, and valuable metallic aluminum trapped inside the oxide network.<\/p>\n

During aluminum melting, the contact between molten aluminum and oxygen inevitably produces oxide films. Continuous furnace charging, alloying, stirring, and metal transfer can accelerate oxidation, causing more dross formation. Without proper treatment, a considerable amount of molten aluminum remains trapped inside the dross layer and is lost during skimming.<\/p>\n

A properly selected \u0444\u043b\u044e\u0441 \u0434\u043b\u044f \u0443\u0434\u0430\u043b\u0435\u043d\u0438\u044f \u043e\u043a\u0430\u043b\u0438\u043d\u044b \u0441 \u0430\u043b\u044e\u043c\u0438\u043d\u0438\u044f<\/strong> helps break down the oxide structure, improve the separation between aluminum metal and slag, and transform sticky wet dross into a drier and easier-to-remove residue.<\/p>\n

\n
\n\n\n\n\n\n\n\n\n\n
\u041f\u0443\u043d\u043a\u0442<\/th>\n\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435<\/th>\n<\/tr>\n<\/thead>\n
Product name<\/td>\n\u0424\u043b\u044e\u0441 \u0414\u0440\u043e\u0441\u0441\u0438\u043d\u0433\u0430<\/td>\n<\/tr>\n
Also known as<\/td>\nDeslagging Flux, Aluminum Slag Removal Flux, Slagging Agent<\/td>\n<\/tr>\n
Main application<\/td>\nAluminum melting and casting<\/td>\n<\/tr>\n
Primary function<\/td>\nSeparate metallic aluminum from oxide dross<\/td>\n<\/tr>\n
Main benefit<\/td>\nReduce aluminum loss and improve metal recovery<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

The main purpose of drossing flux is not simply to \u201cremove slag faster\u201d. The real production value comes from recovering aluminum that would otherwise leave the furnace together with the dross.<\/p>\n

\"flux
flux used in molten aluminum<\/em><\/figcaption><\/figure>\n

How Does Drossing Flux Work in Molten Aluminum?<\/h2>\n

The working mechanism of \u0444\u043b\u044e\u0441 \u0434\u043b\u044f \u0443\u0434\u0430\u043b\u0435\u043d\u0438\u044f \u043e\u043a\u0430\u043b\u0438\u043d\u044b \u0441 \u0430\u043b\u044e\u043c\u0438\u043d\u0438\u044f<\/strong> involves several physical and chemical effects. Most commercial drossing fluxes contain chloride-based salts combined with fluoride compounds and other active ingredients. The exact formulation varies depending on alloy type, furnace conditions, and application requirements.<\/p>\n

When added to molten aluminum, the flux penetrates the dross layer and improves the fluidity of the oxide mixture. This allows small aluminum droplets trapped inside the dross to merge together and flow back into the molten bath.<\/p>\n

The main effects include:<\/p>\n

1. Reducing dross viscosity<\/h3>\n

Fresh aluminum dross is often dense, sticky, and difficult to separate because aluminum droplets are physically trapped inside oxide networks. Drossing flux modifies this structure and helps release metallic aluminum.<\/p>\n

2. Improving metal-slag separation<\/h3>\n

The flux reduces the interfacial resistance between aluminum metal and oxide compounds. As a result, aluminum droplets can separate more easily from the slag phase.<\/p>\n

3. Producing dry and removable dross<\/h3>\n

After effective treatment, dross usually becomes lighter, more powdery, and less metallic. This makes mechanical skimming easier and reduces unnecessary aluminum loss.<\/p>\n

\n
\n\n\n\n\n\n\n\n
Dross Condition<\/th>\nAppearance<\/th>\nProduction Meaning<\/th>\n<\/tr>\n<\/thead>\n
Wet dross<\/td>\nHeavy, sticky, metallic appearance<\/td>\nHigh aluminum trapped inside<\/td>\n<\/tr>\n
Flux-treated dross<\/td>\nDry, loose, powdery<\/td>\nBetter aluminum recovery<\/td>\n<\/tr>\n
Over-oxidized dross<\/td>\nDark, dense, burnt appearance<\/td>\nExcessive oxidation and metal loss<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

A common mistake in aluminum production is judging flux performance only by the amount of slag removed. A better evaluation method is measuring how much aluminum remains inside the removed dross.<\/p>\n

\"aluminum
aluminum furnace<\/em><\/figcaption><\/figure>\n

What Is the Difference Between Drossing Flux and Refining Flux?<\/h2>\n

Although both products belong to aluminum melt treatment, drossing flux and refining flux serve different purposes<\/strong>. Selecting the wrong flux type may increase consumption without solving the actual melt quality problem.<\/p>\n

Drossing flux focuses on slag treatment and aluminum recovery<\/strong>, while refining flux is mainly used for improving melt cleanliness by removing dissolved hydrogen and non-metallic inclusions.<\/p>\n

\n
\n\n\n\n\n\n\n\n\n
\u0422\u0438\u043f \u0444\u043b\u044e\u0441\u0430<\/th>\n\u041e\u0441\u043d\u043e\u0432\u043d\u0430\u044f \u0444\u0443\u043d\u043a\u0446\u0438\u044f<\/th>\nTarget Problem<\/th>\n<\/tr>\n<\/thead>\n
\u0424\u043b\u044e\u0441 \u0414\u0440\u043e\u0441\u0441\u0438\u043d\u0433\u0430<\/td>\nSeparate aluminum from surface dross<\/td>\nMetal loss during slag removal<\/td>\n<\/tr>\n
\u0424\u043b\u044e\u0441 \u0434\u043b\u044f \u0440\u0430\u0444\u0438\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f<\/td>\nClean molten aluminum<\/td>\nOxides, inclusions, melt cleanliness<\/td>\n<\/tr>\n
\u0414\u0435\u0433\u0430\u0437\u0438\u0440\u0443\u044e\u0449\u0438\u0439 \u0444\u043b\u044e\u0441<\/td>\nReduce hydrogen content<\/td>\nGas porosity risk<\/td>\n<\/tr>\n
\u041f\u043e\u043a\u0440\u044b\u0432\u0430\u044e\u0449\u0438\u0439 \u0444\u043b\u044e\u0441<\/td>\nProtect melt surface<\/td>\nOxidation prevention<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

For applications requiring higher melt cleanliness, drossing flux is often used together with other aluminum purification technologies, such as \u0444\u0438\u043b\u044c\u0442\u0440\u0430\u0446\u0438\u044f \u0440\u0430\u0441\u043f\u043b\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0433\u043e \u0430\u043b\u044e\u043c\u0438\u043d\u0438\u044f<\/strong> \u0438 rotary degassing systems<\/strong>. Filtration removes solid inclusions, while degassing equipment reduces dissolved hydrogen before casting.<\/p>\n

This combination is especially important for applications such as:<\/p>\n