A direct reduction rotary kiln and a method of mineral reduction

By modifying the rotary kiln with a steam pipe, the high energy consumption and uneven reduction of coal-based rotary kilns are solved by using steam to react with carbon to generate CO and H2 as reducing agents. This achieves low-energy-consumption rapid reduction and kiln wall protection, and improves reduction efficiency and production stability.

CN115823864BActive 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
2022-12-01
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

The existing direct reduction method in coal-based rotary kilns has problems such as small production scale, high energy consumption, serious dust pollution, large temperature field fluctuations, uneven reduction and unstable production, and the application effect of hydrogen metallurgy in rotary kilns is limited.

Method used

A steam pipe is installed inside the refractory bricks of the rotary kiln. The high temperature of the rotary kiln heats the water in the steam pipe into steam, which is then sprayed into the inner cavity of the rotary kiln through a nozzle. The steam reacts with carbon to produce CO and H2, which are used as reducing agents to reduce minerals. At the same time, the kiln wall is protected by the self-heating of the steam pipe and the utilization of waste heat.

Benefits of technology

It achieves low-energy and rapid mineral reduction, improves reduction efficiency, reduces carbon consumption, extends the service life of rotary kilns, and solves the problems of low heat dissipation from kiln walls and low utilization rate of flue gas waste heat.

✦ Generated by Eureka AI based on patent content.

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    Figure CN115823864B_ABST
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Abstract

The application provides a direct reduction rotary kiln and a mineral reduction method, the direct reduction rotary kiln comprising a kiln head, a kiln body and a kiln tail; the kiln head is provided with a burner; the direct reduction rotary kiln is a cylindrical structure, the lateral wall of the kiln body of the direct reduction rotary kiln is piled by refractory bricks; the refractory bricks of the lateral wall of the kiln body are provided with water vapor pipelines; the inner lateral wall of the kiln body is provided with water vapor nozzles; the water vapor nozzles are communicated with the water vapor pipelines and the inner chamber of the direct reduction rotary kiln. The direct reduction rotary kiln and the reduction method provided by the application can overcome the problems of high energy consumption, long reduction reaction time, insufficient hydrogen reaction and the like in the prior art; meanwhile, the problems of low utilization rate of heat dissipation and flue gas waste heat of the rotary kiln direct reduction kiln wall, low solid carbon reduction efficiency and large carbon consumption can be solved, so that low energy consumption and fast rotary kiln direct reduction are realized.
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