Method for refining metal
AssigneeFerrum Technologies FlexCo
InventorsEduard Baeck, Nicolás Lalla, Aleksandr Markelov, Andreas Carl Weber
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Abstract
A method for refining metal and processing slag to obtain a low content of impurities, reduce iron loss and increase productivity. In the method, a first furnace creates an initial slag with a low basicity and a high metal oxide content. The initial slag is heated and the metal oxide content of the initial slag is reduced to produce a resulting slag product with a low iron oxide content. The method produces more steel and a slag product having less iron oxide than is possible with conventional processes.
Claims31
A method for refining metal and processing slag, the method comprising:
- processing a feed material with a melting process, wherein the melting process comprises:
- conveying the feed material into a first furnace;
- heating the feed material inside the first furnace to a first temperature to produce a crude steel and an initial slag;
- introducing one or more oxidizing agents into the first furnace;
- introducing a slag forming agent into the first furnace;
- and
- allowing the one or more oxidizing agents and the slag forming agent to react with the feed material within the first furnace at least until the initial slag comprises a basicity of below 1.5 and an iron oxide (“FeO”) content of at least 35%, wherein the basicity comprises a binary basicity of the ratio of calcium oxide to silicon dioxide;
- and
- processing the initial slag with a slag post-treatment process, wherein the slag post treatment process comprises:
- providing one or more post-treatment reducing agents;
- and
- producing a slag treatment metal and a slag product by allowing the one or more post-treatment reducing agents to react with the initial slag.
A method for processing metallurgical slag to recover differentiated metallic fractions, the method comprising:
- receiving a slag into a slag treatment reactor;
- and
- refining the slag by introducing a reducing agent in at least one step comprising:
- reducing an iron oxide (“FeO”) content of the slag to a predetermined concentration lower than a previous concentration and separating at least one metallic fraction.
Dependencies are inferred from the claim text.