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Cascade roasting and smelting reduction ironmaking method and equipment

A cascade and reducing agent technology, applied in the field of smelting reduction ironmaking, can solve problems such as sticking and blocking of conveying pipes and dust collectors, and unbearable heat storage refractory materials, and achieve low production and operation costs, low transformation costs, and low coal consumption Effect

Active Publication Date: 2021-04-02
夏忠仁 +3
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is impossible to directly remove dust from the airflow above 1450°C. The furnace dust carried is also a molten state of tiny beads, which will immediately stick to block the conveying pipeline and the inner space of the dust collector, and the heat storage refractory material of the heat exchange equipment cannot withstand such a high temperature

Method used

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  • Cascade roasting and smelting reduction ironmaking method and equipment
  • Cascade roasting and smelting reduction ironmaking method and equipment
  • Cascade roasting and smelting reduction ironmaking method and equipment

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Embodiment Construction

[0038] Below the present invention will be further described with specific embodiment

[0039] The iron ore fines that embodiment uses and coal component and chemical composition are as table 2

[0040] Table 2

[0041]

[0042] In this embodiment, the iron grade of the batch iron ore powder is 58.270%. 1716kg of iron ore powder is needed per ton of iron.

[0043] The proportion of iron in the iron ore in the core material and the outer layer material is 50% to 50%, but considering the contact interface between the core and the outer layer, the carbon particles on the surface of the ball core will also oxidize the iron on the outer layer of the interface between the inner and outer layers The material produces direct reduction, and a part of the iron ore powder near the outer layer interface is classified into the core share. Batching is 45% to 55% in the embodiment. In addition, it is also possible to use iron ore powder with a slightly lower iron grade in the outer la...

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Abstract

A multistage roasting-smelting method for reduction ironmaking and a full system apparatus set for closed energy circulation. The system apparatus comprises: a first stage reduction unit (1), a second stage reduction unit (2), a third stage reduction unit (3), a hot dust remover (4), a hot air furnace heat exchanger (5, 6), a blower (7), a drying unit for coal and a composite carbon containing pellet (8), a high-temperature fuel gas switch valve and heat-retaining pipeline system (24), a heat-exchanging exhaust gas switch valve and pipeline system (27), a room-temperature air blowing switch valve and pipeline system (32), and a high-temperature hot air switch valve and heat-retaining pipeline system (35). Remaining energy from the previous stage flows into and is used directly by the next stage, allowing maximum self-circulation and utilization of energy supplied by coal in a furnace.

Description

technical field [0001] The invention relates to the field of smelting reduction ironmaking. In particular, it relates to a method for smelting composite carbon-containing pellets with a double-layer structure to reduce iron. Background technique [0002] The present invention is a new smelting reduction ironmaking method developed on the basis of the patent technology of Chinese Patent No. 200710065973.3 "Method, Device and Raw Materials for Smelting Reduction Ironmaking" proposed by the applicant in 2007. Ironmaking energy consumption is the background technology. [0003] In recent years, with the progress of social development, human beings have consumed a large amount of fossil energy on a large scale. Consumption of coal resources, the iron and steel sector is second only to thermal power generation. Over the past ten years, the world has produced no less than 6.5 billion tons of pig iron, used up no less than 5 billion tons of washed and refined coking coal, and hol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B11/00
CPCC21B11/00Y02P10/20
Inventor 夏忠仁
Owner 夏忠仁