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Device and method for treating refractory iron ore

An iron ore, difficult to select technology, applied in the direction of improving process efficiency, etc., can solve the problems of not mentioning the equipment that can be industrialized, not having the practicality of industrial scaled production, and the recovery rate is less than 55%, Achieve the effect of saving high-quality fuel, improving economies of scale and saving investment costs

Inactive Publication Date: 2012-08-15
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] (1) The process is very long, and the ore needs to be oxidized and roasted first, then directly reduced, and then melted after crushing and magnetic separation to obtain the final product
[0019] (2) After the ore is oxidized and roasted in the advanced oxidation roaster, it is then directly reduced, which increases energy consumption and pollution
[0024] (1) The direct reduction equipment used is a small laboratory-scale muffle furnace, and the results are not representative, nor do they have the practicability for industrial scale-up production
[0025] (2) The additive used is sodium carbonate, and the consumption is as high as 20-30% of th

Method used

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  • Device and method for treating refractory iron ore
  • Device and method for treating refractory iron ore
  • Device and method for treating refractory iron ore

Examples

Experimental program
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Effect test

Example Embodiment

[0075] Example 1

[0076] Use fine-grained hard-to-select hematite ore with a total iron content of 44.98%. 63 parts of hard-to-select hematite ore according to the fine particles; 14 parts of anthracite; 4 parts of binder, after mixing uniformly, use a pair of roller high-pressure ball press to form agglomerates, and pass the dried carbonaceous pellets through the distributing device Distributed into the rotary hearth furnace, the carbon-containing pellets pass through the feeding zone, preheating zone, heating zone, high temperature zone, control zone and discharge zone of the regenerative rotary hearth furnace in sequence; the process parameters are as follows:

[0077] Preheating zone: temperature 800℃~1000℃, time 3min;

[0078] Heating zone: temperature 1000℃~1250℃, time 3min;

[0079] High temperature zone: temperature 1250℃~1350℃, time 15min;

[0080] Control area: temperature 1350℃~1200℃, time 8min.

[0081] Finally, the metallization rate of the metallized pellets discharged f...

Example Embodiment

[0082] Example 2

[0083] High-phosphorus oolitic hematite is selected. The refractory ore contains 38.33% iron and 0.89% phosphorus. According to 84 parts of high-phosphorus oolitic hematite; 32 parts of lignite; 18 parts of limestone; after the specific gravity of 14 parts of binder is evenly mixed, agglomerates with a pair of roller high-pressure ball press, and the dried carbonaceous pellets are passed through The distributing device is placed into the rotary hearth furnace, and the carbon-containing pellets pass through the feeding zone, preheating zone, heating zone, high temperature zone, control zone and discharge zone of the regenerative rotary hearth furnace in sequence. The process parameters are as follows:

[0084] Preheating zone: temperature: 800℃~1000℃, time: 4min;

[0085] Heating zone: temperature: 1000℃~1250℃, time: 15min;

[0086] High temperature zone: temperature: 1250℃~1350℃, time: 3min;

[0087] Control area: temperature: 1350℃~1200℃, time: 3min.

[0088] Finall...

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Abstract

The invention provides a device and a method for treating refractory iron ore, which have high iron resource recovery rate and are capable of directly reducing the refractory iron ore. The device for treating the refractory iron ore provided by the invention comprises a regenerative rotary hearth furnace, wherein the regenerative rotary hearth furnace comprises a furnace chamber enclosed by an annular inner wall, an annular outer wall and a furnace bottom; the furnace bottom can rotate; the furnace chamber is divided into a feeding area, a pre-heating area, a heating area, a high-temperature area, a control area and a discharge area; and a feeding hole is arranged on the annular outer wall of the feeding area, and a discharge hole is arranged on the annular outer wall of the discharge area. According to the device and the method for treating the refractory iron ore provided by the invention, the rotary hearth furnace adopts a regenerative combustion technology, and therefore, the time of pellets in the pre-heating area of the rotary hearth furnace is shortened, the time of the pellets in a reducing area is indirectly increased and metallization ratio of directly reduced iron is improved.

Description

technical field [0001] The invention relates to a device and a method for recovering iron resources, in particular to a device and a method for processing refractory iron ore. Background technique [0002] In 2011, my country imported 686 million tons of iron ore, a year-on-year increase of 10.9%, with a total value of US$112.41 billion, a year-on-year increase of 40.9%. The average import price was US$163.8 / ton, a year-on-year increase of 27%. The total import volume hit a record high. The above data show that there is a large gap between my country's iron ore demand and domestic supply, and among my country's proven iron ore, complex and refractory iron ore accounts for 20% to 25% of iron resource reserves, reaching more than 100% billion tons, these iron ores have not been rationally utilized yet. This type of ore can be roughly divided into five types: 1) Anshan-style lean red (magnetic) iron ore with fine particles disseminated, and the reserves of this type of ore are ...

Claims

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Application Information

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IPC IPC(8): C21B13/00
CPCY02P10/20
Inventor 吴道洪贾岩曹志成
Owner SHENWU TECH GRP CO LTD
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