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Method and equipment for direct reduction of iron ore fines

A direct technology of iron ore powder, which is applied in the field of direct reduction of iron ore powder, metallurgical equipment, and equipment for direct reduction of iron ore powder, can solve the problems of low production capacity of a single machine and strong dependence on natural gas, etc., to reduce temperature difference and increase The effect of a large surface area

Active Publication Date: 2016-04-06
PANZHIHUA LIYU MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as reduction equipment is concerned, coal-based reduction furnaces include tunnel kilns, rotary kilns, and rotary hearth furnaces. These furnaces have low stand-alone production capacity and are only suitable for small and medium-scale production; Although large-scale production is possible, it is highly dependent on natural gas. In the absence of natural gas, pulverized coal must be used to produce gas through a "coal-to-gas furnace". At the same time, the reduced material must be oxidized pellets, as above. The disadvantages described also arise

Method used

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  • Method and equipment for direct reduction of iron ore fines
  • Method and equipment for direct reduction of iron ore fines
  • Method and equipment for direct reduction of iron ore fines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: adopt this method to prepare reduced iron powder

[0047] Mix 100g Panzhihua vanadium-titanium iron concentrate (iron content: 59%, titanium content: 9%, particle size -200 mesh), 20-30g coal powder (particle size-10 mesh-20 mesh), and 1.1-1.5g sodium salt (shapeable), preheat at 1150°C for 10-20 minutes, reduce at 1300°C for 25-35 minutes, and get a metallized sintered block with a grade of 70-80% after the discharge is water-cooled. The metallized sintered block is crushed, The primary reduced iron powder obtained by beneficiation, the iron grade is 98%, the iron yield reaches 95%, the iron grade of the remaining tailings is 10-15%, the iron yield is 3-4%, the titanium grade is 39-40%, and the tailings titanium yield is 80%, the primary reduced iron powder is reduced by hydrogen at 600-800°C to obtain secondary reduced iron powder with an iron grade greater than 99.5%.

Embodiment 2

[0048] Embodiment 2: adopt this method to prepare reduced iron powder

[0049] Mix 100g Panzhihua vanadium-titanium iron concentrate (iron content: 55%, titanium content: 10%, particle size -200 mesh), 20-30g coal powder (particle size-10 mesh-20 mesh), and 1.1-1.5g sodium salt (shapeable), preheat at 1150°C for 10-20 minutes, reduce at 1300°C for 25-35 minutes, and get a metallized sintered block with a grade of 70-80% after the discharge is water-cooled. The metallized sintered block is crushed, The primary reduced iron powder obtained by beneficiation, the iron grade is 97.3%, the iron yield reaches 95%, the iron grade of the remaining tailings is 10-15%, the iron yield is 3-4%, the titanium grade is 39-40%, and the tailings titanium yield is 80%, primary reduced iron powder is reduced by hydrogen at 600-800°C to obtain secondary reduced iron powder with an iron grade greater than 99.5%.

[0050]

Embodiment 3

[0051] Embodiment 3: adopt this method to prepare reduced iron powder

[0052] Mix 100g Panzhihua ordinary iron concentrate (iron content: 60%, particle size -200 mesh), 20-30g coal powder (particle size-10 mesh-20 mesh), 1.1-1.5g sodium salt (shapeable), and mix at 1150 Preheat at a temperature of 10-20min for 10-20min, reduce for 25-35min at a temperature of 1300℃, and obtain a metallized sintered agglomerate with a grade of 70% after the discharge is water-cooled. 97.5%, the iron yield reaches 95%, the iron grade of the remaining tailings is 10-15%, and the iron yield is 3-4%. The primary reduced iron powder is reduced by hydrogen at 600-800°C to obtain the secondary Reduced iron powder.

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Abstract

The invention discloses an iron ore powder reduction method, and particularly relates to a method for iron ore powder direct reduction. According to the iron ore powder direct reduction method, the eggshell effect is avoided. The method comprises the steps that A, magnet concentrate fines, pulverized coal and catalysts are mixed evenly; B, evenly-mixed materials are pressed into a material block with holes, and honeycomb holes are formed in the material block with the holes; C, the material block with the holes is fed into a tunnel kiln to be directly reduced, a combustion chamber of the tunnel kiln is partitioned by a heat conduction material plate to form an upper layer and a lower layer, a combustor and a reaction chamber are formed, the material block with the holes is fed into the reaction chamber, and heat generated in the combustor is used for indirectly heating the material block with the holes. Due to the fact that the combustion chamber is separated into the combustor and the reaction chamber, the material block with the holes cannot be directly heated, the heat in the combustor is conducted to the reaction chamber through the heat conduction material plate, and meanwhile due to the fact that the material block with the holes is provided with the honeycomb holes, the heating degrees of the material block at all positions are close.

Description

technical field [0001] The invention relates to a method for reducing iron ore powder, in particular to a method for direct reduction of iron ore powder. In addition, the present invention also relates to a metallurgical equipment, especially an equipment for direct reduction of iron ore powder. Background technique [0002] In the iron and steel industry, iron ore powder is sintered and then sent to the blast furnace to be smelted into molten iron, which then becomes the main raw material with high heat energy in the next process. Long-term industrial production practice has formed a large-scale and mature traditional process. With the technical research and progress, this traditional process is challenged by the direct reduction iron process technology due to its high energy consumption, high investment, high pollution and high operating cost. At present, the research and production of direct reduced iron are mainly based on gas-based reduction and coal-based reduction. C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/00
Inventor 何德武桑曙光安冬
Owner PANZHIHUA LIYU MINING