{"id":2436,"date":"2025-12-23T10:00:19","date_gmt":"2025-12-23T02:00:19","guid":{"rendered":"https:\/\/www.c-adtech.com\/?p=2436"},"modified":"2026-02-04T09:33:43","modified_gmt":"2026-02-04T01:33:43","slug":"remove-scum-on-molten-metal","status":"publish","type":"post","link":"https:\/\/www.c-adtech.com\/ja\/remove-scum-on-molten-metal\/","title":{"rendered":"\u6eb6\u878d\u91d1\u5c5e\u306e\u30b9\u30ab\u30e0\u9664\u53bb"},"content":{"rendered":"

The most reliable way to remove scum from molten metal is to combine correct melt preparation, the right flux<\/a> chemistry, and efficient surface removal equipment so that oxide films and entrained inclusions are separated from the metal with minimal metal loss and low risk to product quality. In practical terms, this means controlling furnace temperature and charge practice, applying an appropriate salt or gas flux to convert sticky scum into a dry, skim-able layer, and using skilled mechanical or automated skimming to remove that layer promptly. When these elements are implemented together, yield improves and casting defects caused by surface oxides fall sharply.<\/p>\n

1. What is scum, dross and slag on molten metal<\/h2>\n

In foundries and melt shops, surface contaminants that collect on molten metal are commonly called scum, dross or slag depending on metal system and composition. For light metals like aluminum the common term is dross. Scum refers to the floating film of oxides, trapped flux residues, and foreign inclusions that sit on the melt surface. For ferrous melts the equivalent is often called slag. The target of scum removal is to extract this undesired material while preserving as much metallic liquid as possible.<\/p>\n

\"Liquid

Liquid Aluminum Cleaning, Molten Metal On Modern Factory<\/figcaption><\/figure>\n

2. Why removal matters: quality, safety, and economics<\/h2>\n

Removing scum is not cosmetic. Left in place, scum causes:<\/p>\n