A medium-silicon high-manganese molten iron converter single-slag automatic control smelting method

The automatic control smelting method of single slag in high-manganese iron converter solves the problem of insufficient collaborative management of the entire iron process, and achieves precise matching of iron temperature, silicon and manganese content and iron ratio, which improves smelting efficiency and steel quality, solves the problems of large temperature drop and composition fluctuation of iron, and meets the requirements of high-end steel grades.

CN122303518APending Publication Date: 2026-06-30XINJIANG BAYI IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XINJIANG BAYI IRON & STEEL CO LTD
Filing Date
2026-03-09
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing technologies are mostly localized optimizations of a single process or scenario, lacking coordinated control over the entire process of molten iron. This makes it difficult to achieve dynamic and precise adjustment, resulting in large temperature drops, compositional fluctuations, and low pretreatment efficiency of molten iron, which cannot meet the stringent requirements of high-end steel grades for homogeneous, clean, and stable molten iron.

Method used

The single-slag automatic control smelting method of medium silicon and high manganese molten iron converter is adopted. By controlling the molten iron parameters, adjusting the oxygen lance position and oxygen supply intensity, and precise feeding method, the blowing process is refined. This includes a five-hole oxygen lance with a six-hole ring arrangement, staged oxygen step control, and batch feeding to ensure the coordinated matching of molten iron temperature, silicon and manganese content and molten iron ratio.

Benefits of technology

It effectively solves the problems of high risk of splashing in the middle stage, serious slag overflow in the early stage and difficulty in decarburization in the later stage, improves smelting efficiency and process stability, avoids the complexity and heat loss of the traditional double slag method, and improves the quality of molten steel and production efficiency.

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Abstract

This invention belongs to the field of iron and steel smelting technology, specifically disclosing an automatic control smelting method for single-slag in a converter for medium-silicon and high-manganese molten iron. The method includes controlling molten iron parameters: maintaining the molten iron temperature at 1220-1400℃, the silicon content at 0.55%-0.70%, the manganese content ≥0.60%, and the molten iron ratio precisely controlled at 74%; adjusting the oxygen lance position and oxygen supply intensity: employing a five-hole oxygen lance with a diameter of 273mm, bottom blowing arranged in a six-hole ring, pre-setting multiple oxygen step stages, and controlling the oxygen lance position and oxygen supply intensity for each oxygen step stage; and precise feeding method: using lime, magnesium balls, and sintered ore as slag-forming raw materials, fed in batches. This method, targeting the physicochemical characteristics of medium-silicon and high-manganese molten iron, avoids the process complexity and heat loss associated with the traditional double-slag method by using single-slag operation, solving the technical problems of severe slag overflow in the early stage, high risk of splashing in the middle stage, and difficulty in decarburization in the later stage under these molten iron conditions.
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