A system and method for producing chromium and nickel-based stainless steel based on furnace tubes

By using a two-step method of fluidized bed reduction and vacuum melting, the problems of long stainless steel smelting process, high energy consumption and large carbon emissions in existing technologies have been solved, and efficient production of chromium and nickel stainless steel has been achieved.

CN117625874BActive Publication Date: 2026-07-10ZHONGYE-CHANGTIAN INT ENG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHONGYE-CHANGTIAN INT ENG CO LTD
Filing Date
2022-08-15
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing stainless steel smelting processes are characterized by long processes, high energy consumption, and large carbon emissions. In particular, the three-step smelting method suffers from problems such as complex equipment systems, large footprint, and high investment and production costs.

Method used

A two-step method based on furnace tube fluidized bed reduction and vacuum melting is adopted. The temperature and reducing medium generated by the reduction of iron, chromium and nickel oxides in the reduction furnace are set separately. By setting the inlet of each metal oxide and the inlet of the reducing gas, the metal oxides are fluidized in the reduction furnace and the reducing gas is fluidized to generate elemental metals, which are directly fed into the vacuum refining furnace to produce chromium and nickel stainless steel.

Benefits of technology

The system includes a new two-step process of efficient fluidized bed reduction and vacuum melting. By using the fluidized state of reducing gas in the fluidized bed reduction furnace, it achieves the efficient production of chromium and nickel stainless steel, solving the problems of long smelting process, high energy consumption and large carbon emissions in the existing technology.

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Abstract

A system for preparing chromium and nickel stainless steel based on furnace tube, comprising a reduction furnace and a vacuum refining furnace. The reduction furnace is provided with an iron oxide inlet, a chromium oxide inlet, a nickel oxide inlet, a first reducing gas inlet, a second reducing gas inlet and a metal element outlet. The iron oxide inlet is located in the middle upper part of the side wall of the reduction furnace. The chromium oxide inlet is located in the middle lower part of the side wall of the reduction furnace. The nickel oxide inlet is located at the top of the reduction furnace. The first reducing gas inlet is located in the middle part of the side wall of the reduction furnace. The second reducing gas inlet is located at the bottom of the reduction furnace. The metal element outlet is located at the top of the reduction furnace. The metal element outlet of the reduction furnace is connected to the vacuum refining furnace. The system of the present application only comprises a reduction furnace and a vacuum refining furnace, that is, the present application utilizes the different reduction reaction temperatures and reduction media of various metal oxides, and proposes a two-step method of fluidized reduction + vacuum melting to prepare chromium and nickel stainless steel, thereby shortening the process flow.
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