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Method for producing molten iron through powdery iron ore suspension state direct reducing-electric arc furnace smelting

An electric arc furnace smelting and iron ore technology, applied in the field of metallurgy, can solve the problem of high foreign dependence of iron ore resources, and achieve the effects of high heat utilization efficiency, energy saving and no heat loss

Active Publication Date: 2019-05-28
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the change of the world resource situation, the problems of blast furnace ironmaking process are becoming more and more prominent: first, the blast furnace ironmaking process relies heavily on metallurgical coke, and with the consumption of high-quality metallurgical coke, the blast furnace process will be further restricted; second, Most of my country's iron ore resources are low-grade ore, which cannot be directly utilized through the blast furnace process. It is necessary to import foreign high-quality iron ore, which has caused my country's iron ore resources to rely too much on foreign countries; if domestic fine ore can be produced without sintering The method of block or pelletizing (pellets) can be directly utilized, which can significantly reduce energy consumption, reduce pollution emissions and save production costs; therefore, the related technologies for large-scale and efficient utilization of powdered iron ore have yet to be developed

Method used

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  • Method for producing molten iron through powdery iron ore suspension state direct reducing-electric arc furnace smelting
  • Method for producing molten iron through powdery iron ore suspension state direct reducing-electric arc furnace smelting

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A certain powdery iron ore contains TFe 55.88%, FeO 0.30%, SiO 2 3.01%, Al 2 o 3 7.28%, CaO 0.10%, MgO 10.2%, P 0.08%, S 0.03%, the particle size of -0.074mm accounts for 40% of the total weight;

[0036]The powdered iron ore is transported to the first-stage cyclone separator through the silo, and the first-stage solid material is separated and enters the lower part of the suspension heating furnace; the air outlet of the first-stage cyclone separator is connected with the air inlet of the dust collector, and the dust collector The gas outlet of the suspension heating furnace is connected with the induced draft fan; the bottom of the suspension heating furnace is connected with the high temperature flue gas outlet of the electric arc furnace. Level solid material heating;

[0037] The gas outlet of the secondary cyclone separator is connected with the feed port of the primary cyclone separator, and the discharge port of the secondary cyclone separator is connected...

Embodiment 2

[0047] A powdered iron ore containing TFe 56.58%, FeO 0.13%, SiO 2 7.81%, Al 2 o 3 3.02%, CaO 0.10%, MgO 0.11%, P 0.08%, S 0.04%, the particle size of -0.074mm accounts for 50% of the total weight;

[0048] Method is with embodiment 1, and difference is:

[0049] (1) The flux is calcium oxide, and the amount of flux added is to control the basicity of the slag layer at 1.50;

[0050] (2) The temperature of the high-temperature flue gas is 1040°C, and the temperature when the primary solid material enters the secondary cyclone separator after heating is 810°C; the volume flow rate of the high-temperature flue gas in the suspension heating furnace and the mass flow rate of the primary solid material Scale is 0.1m 3 / kg; the ratio of the volume flow rate of the reducing gas in the reduction reactor to the mass flow rate of the secondary solid material is 0.06m 3 / kg, the residence time of the secondary solid material in the reduction reactor is 40min, and the temperature o...

Embodiment 3

[0056] A certain powdery iron ore contains TFe 61.92%, FeO 12.06%, SiO 2 3.53%, Al 2 o 3 7.81%, CaO 0.10%, MgO 0.16%, P 0.09%, S 0.02%, the particle size of -0.074mm accounts for 80% of the total weight;

[0057] Method is with embodiment 1, and difference is:

[0058] (1) The flux is an equal mass mixture of limestone and calcium oxide, and the amount of flux added is at 2.00 to control the alkalinity of the slag layer;

[0059] (2) The temperature of the high-temperature flue gas is 1130°C, and the temperature when the primary solid material enters the secondary cyclone separator after heating is 910°C; the volume flow rate of the high-temperature flue gas in the suspension heating furnace and the mass flow rate of the primary solid material Scale is 0.2m 3 / kg; the ratio of the volume flow rate of the reducing gas in the reduction reactor to the mass flow rate of the secondary solid material is 0.08m 3 / kg, the residence time of the secondary solid material in the re...

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Abstract

A method for producing molten iron through powdery iron ore suspension state direct reducing-electric arc furnace smelting is conducted according to the following steps that firstly, powdery iron oreis arranged in a material bin; secondly, the material bin is used for conveying the powdery iron ore to a first-level cyclone separator, first-level solid materials are separated out and enter the lower portion of a suspension heating furnace, and the bottom of the suspension heating furnace is inflated with high-temperature smoke; thirdly, under the action of the negative pressure, the first-level solid materials enter a second-level cyclone separator, and second-level solid materials are separated out and enter a reducing reactor; fourthly, the interior of the reducing reactor is inflated with reducing gas, the second-level solid materials are subjected to the reducing reaction, and reducing powder is generated; and fourthly, the reducing powder directly enters an electric furnace, electric arc melting is conducted, meanwhile, a fluxing agent is added in the electric furnace, and a liquid slag layer and molten iron are formed through the reducing powder. According to the method, theheat utilization efficiency is high, heat losses are avoided in various procedures, energy is greatly saved, and the processes of iron ore reducing and molten iron smelting are simplified.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for producing molten iron by direct reduction-electric arc furnace smelting of powdered iron ore in a suspended state. Background technique [0002] my country is rich in iron ore resource reserves. By the end of 2015, the proven resource reserves were 85.08 billion tons. However, my country's iron ore resource endowment is poor, and the overall characteristics are low grade, fine particle size, and complex composition. As a result, more than 97% of iron ore needs to be processed through complex beneficiation processes to achieve high grade and recovery rate. Therefore, almost 100% of domestic iron ore concentrates are fine iron ore powder, and the particle size will become finer and finer. The biggest use of iron ore is to make iron. [0003] At present, at home and abroad, powdery iron concentrate is generally sintered or made into pellets for use in bl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/12
Inventor 李艳军韩跃新余建文高鹏孙永升
Owner NORTHEASTERN UNIV
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