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Reduction kiln equipment and method for directly reducing iron

A reduced iron and kiln technology, applied in furnaces, furnace types, fluidized bed furnaces, etc., can solve the problem of inability to reduce and separate reduced iron products, and achieve the effect of reducing reduction time, good effect, and preventing heat from running up.

Inactive Publication Date: 2012-08-22
辽宁博联特冶金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional coal-based tunnel kiln method cannot use low-grade ore and iron-containing waste to directly reduce and separate high-grade reduced iron products

Method used

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  • Reduction kiln equipment and method for directly reducing iron

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Adopt the reduction kiln equipment direct reduction iron of above-mentioned direct reduction iron, carry out as follows:

[0025] (1) Preheat the kiln equipment of direct reduced iron to make its temperature reach 1110°C;

[0026] (2) The antelope stone with TFe=67.4% is made into pellets with a diameter of Φ8-16mm, mixed with the reducing agent at a mass ratio of 3:1, and the mixed material is loaded into the kiln car feed pan, and the reduction The agent is coal powder, and its chemical composition is 66.94% of fixed carbon, 21.43% of ash, 7.96% of volatile matter, 3.0% of water, and 0.67% of S in terms of mass percentage;

[0027] (3) Spread the covering agent on the top of the mixed material through the distributing machine, the tile thickness is 10-25mm, and push the kiln car into the kiln. The chemical composition of the covering agent is: fixed carbon 38.9wt%, The volatile content is 4.5wt%, the ash content is 53.60wt%, the water content is 3.0wt%, the basicity ...

Embodiment 2

[0031] Adopt the reduction kiln equipment direct reduction iron of above-mentioned direct reduction iron, carry out as follows:

[0032] (1) Kiln equipment for preheating direct reduced iron to a temperature of 1200°C;

[0033] (2) The antelope stone with TFe=40.46% is made into pellets with a diameter of Φ8~16mm, and then mixed with the reducing agent at a mass ratio of 3:1, and the mixed material is put into the material pan of the kiln car, and the reduction The agent is coal powder, and its chemical composition is 66.94% of fixed carbon, 21.43% of ash, 7.96% of volatile matter, 3.0% of water, and 0.67% of S in terms of mass percentage;

[0034] (3) Spread the covering agent on the top of the mixed material through the distributing machine, the tile thickness is 10-25mm, and push the kiln car into the kiln. The chemical composition of the covering agent is: fixed carbon 35wt%, volatile Particle 6.5wt%, Ash 53.50wt%, Moisture 5.0wt%, Alkalinity R 0.15, Particle size 0.1-3mm...

Embodiment 3

[0038] Adopt the reduction kiln equipment direct reduction iron of above-mentioned direct reduction iron, carry out as follows:

[0039] (1) Kiln equipment for preheating direct reduced iron to a temperature of 1200°C;

[0040] (2) The oolitic hematite with TFe=45.76% is made into pellets with a diameter of Φ8-16mm, and then mixed with the reducing agent at a mass ratio of 3:1, and the mixed material is put into the kiln car feed pan, so that Described reductant is pulverized coal, and its chemical composition is 66.94% by mass percentage, and ash is 21.43%, and volatile matter is 7.96%, and moisture content is 3.0%, and S is 0.67%;

[0041] (3) Spread the covering agent on the top of the mixed material through the distributing machine, the tile thickness is 10-25mm, and push the kiln car into the kiln. The chemical composition of the covering agent is: fixed carbon 38.9wt%, The volatile content is 4.5wt%, the ash content is 53.60wt%, the water content is 3.0wt%, the basicity...

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Abstract

The invention relates to reduction kiln equipment and a method for directly reducing iron and belongs to the technical field of direct iron reduction. The kiln equipment for directly reducing iron comprises a kiln roof, a combustion-supporting air pipeline, a gas pipeline, a burning nozzle, a material disc, a support seat, a bent seal, a kiln car, a combustion chamber, a material pool and a heat accumulation radiation chamber, wherein the combustion chamber is arranged between the kiln roof and the material pool, the side wall of the combustion chamber is provided with the burning nozzle, the combustion-supporting air pipeline, the gas pipeline and the burning nozzle are connected, the upper end of the kiln car is provided with the support seat for supporting the material disc, the space formed among the material disc, the support seat and the kiln car is the heat accumulation radiation chamber, and the kiln car is connected with a kiln through the bent seal. The method for directly reducing iron provided by the invention is carried out according to the following steps that: the kiln equipment is preheated, reduction agents of reduced materials are mixed and filled into the material disc of the kiln car, covering agents are flatly paved on the mixed materials through a material distribution machine, the kiln car is pushed into the kiln for reduction, and reduced iron products are obtained. The kiln equipment and the method have the advantages that energy sources are saved, the reduction time is saved, and the recovery rate of the reduced iron is high.

Description

technical field [0001] The invention relates to the technical field of direct reduction of iron, in particular to a reduction kiln equipment and method for direct reduction of iron. Background technique [0002] China is the world's largest producer of crude steel. In 2011, the steel output exceeded 700 million tons. The annual demand for scrap steel is more than 90 million tons, and the demand for reduced iron is 5 million tons. my country imports 3 million tons of reduced iron annually, but the annual output of reduced iron (sponge iron) is only 600,000 tons. my country is also a country rich in lean iron ore resources. Low-lean and dull iron ore resources account for more than 97% of iron ore resources, but it still needs to import 600 million tons of iron ore from abroad every year. In addition, there are hundreds of millions of tons of sulfuric acid slag, copper slag, dust removal ash and other iron-containing waste produced in my country every year. Now, my country i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00
Inventor 唐竹胜陶立群
Owner 辽宁博联特冶金科技有限公司
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