Method for reducing and separating granular iron rapidly at low temperature

A fast, granular iron technology, applied in the field of metallurgy, can solve the problems of high energy consumption and high reduction temperature, and achieve the effects of continuous and stable temperature in the high temperature zone, energy saving, and reduction of temperature difference

Inactive Publication Date: 2015-05-27
泉州寰锋冶金技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The disadvantages of the above method are: 1. The iron raw material is high-grade iron ore concentrate powder with a grade ≥ 65%; 2. The reduction temperature is too high, generally 1450 ° C, and the energy consumption is relatively high

Method used

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  • Method for reducing and separating granular iron rapidly at low temperature
  • Method for reducing and separating granular iron rapidly at low temperature
  • Method for reducing and separating granular iron rapidly at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A method for rapid reduction and separation of granular iron at low temperature, the steps are as follows:

[0061] (1) Use Sichuan TFe: 43.38% oolitic hematite, crush the ore, dry it, and grind it into -160 mesh 80% ore powder, add metal iron powder, lime powder, ordinary glass to the ore powder Powder and fluorite powder, the amount of each component is calculated by weight fraction: 84% mineral powder, 3% metal iron powder, 4% lime powder, 5% ordinary glass powder and 4% fluorite powder; the above components are uniformly mixed, sprayed Water forms pellets of ￠8~￠16mm;

[0062] (2) Dry the wet pellets in step (1) at 105°C for 2 hours, so that the moisture content is ≤0.5%, and the pellet strength is 118N / ball;

[0063] (3) Add anthracite coal powder (particle size 0~20mm, fixed carbon 65.45%) and lime powder (CaO≥93%, MgO≤5%, S≤0.05%) to the pellet obtained in step (2), the described anthracite coal powder The consumption of lime powder is 40% of pellet weight, and...

Embodiment 2

[0071] A method for rapid reduction and separation of granular iron at low temperature, the steps are as follows:

[0072] (1) Adopt Hunan TFe: 45.56% oolitic hematite, crush and dry the ore, and grind it into -160 mesh 80% ore powder, add metal iron powder, lime powder, ordinary glass to the ore powder Powder and fluorite powder, the amount of each component is calculated by weight fraction: mineral powder 84%, metal iron powder 3%, lime powder 4%, ordinary glass powder 3% and fluorite powder 6%; the above components are uniformly mixed, sprayed Press water to make pellets of 20×22×18mm;

[0073] (2) Dry the wet pellets in step (1) at 105°C for 2 hours, so that the moisture content is ≤0.5%, and the pellet strength is 229N / ball;

[0074] (3) Add anthracite coal powder (particle size 0~20mm, fixed carbon 65.45%) and lime powder (CaO≥93%, MgO≤5%, S≤0.5%) to the pellet obtained in step (2), described anthracite coal powder The consumption of lime powder is 35% of pellet weight...

Embodiment 3

[0082] A method for rapid reduction and separation of granular iron at low temperature, the steps are as follows:

[0083] (1) Use Liaoning Chaoyang TFe: 19.18%, Mn: 21.88% low-poor manganese iron ore. After the ore is crushed and dried, it is ground into -160 mesh accounting for 80% ore powder, and metal iron powder is added to the ore powder , lime powder, ordinary glass powder and fluorite powder, the amount of each component is calculated by weight fraction: 85% of mineral powder, 4% of metal iron powder, 3% of lime powder, 3% of ordinary glass powder and 5% of fluorite powder; After mixing evenly, spray water to form pellets of ￠8~￠16mm;

[0084] (2) Dry the wet pellets in step (1) at 105°C for 2 hours, so that the moisture content is ≤0.5%, and the pellet strength is 126N / ball;

[0085] (3) Add anthracite coal powder (particle size 0~20mm, fixed carbon 55.68%) and limestone powder (CaO≥53%, MgO≤5%, S≤0.05%) to the pellet obtained in step (2), the described anthracite co...

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Abstract

The invention belongs to the technical field of metallurgy and particularly relates to a method for reducing and separating granular iron rapidly at a low temperature. The method comprises the following steps: crushing iron ore, drying, grinding the dried iron ore into fine iron ore powder, adding iron powder, lime powder, ordinary glass powder and fluorite powder into the fine ore powder, spraying with water, mixing, pelletizing or pressing to form pellets; drying the wet pellets, adding reducing coal and a desulfurizing agent, feeding the mixture into a rotary muffle kiln, and carrying out reduction reaction; separating the tail power of a reducing agent from metalized pellets in the high-temperature material from reduction reaction by using a dry magnetic separator; crushing the metalized pellets, and sieving to obtain the granular iron with the size of 3-20mm and the density of 5.8-7.2t / m<3>; polishing the power further, and separating magnetically by adopting a wet process to obtain the high-grade iron powder. The iron ore can be reduced rapidly at a relatively low reducing temperature, the granular iron can be separated, and the yield of the granular iron can be more than 90%. Compared with the Japanese ITmk3 reduction technology, the method provided by the invention can achieve the purposes of saving energy, reducing emission and decreasing carbon to a great extent.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for rapidly reducing and separating granular iron at low temperature. Background technique [0002] my country is a country rich in lean iron ore resources. Low-lean and dull iron ore accounts for more than 96% of iron ore resources, but it needs to import 800 million tons of rich iron ore from abroad every year, and the dependence on imported ore is 55%. A large number of low-poor and refractory fine ores, composite ores and iron-containing wastes have not been well developed and utilized. [0003] In 2011, Kobe Iron and Steel Company of Japan adopted the rotary hearth furnace method to mix carbon briquettes inside the iron ore powder and spread the material in a thin material layer. At a reduction temperature of about 1450°C, the iron particles and slag were separated. This blast furnace ironmaking method is called the first-generation ironmaking method,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/08
Inventor 唐竹胜唐佳
Owner 泉州寰锋冶金技术有限责任公司
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