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Test method for simulation of iron ore direct-reduction by coke reactive determination device

A technology of measuring device and test method, applied in the field of metallurgy, can solve problems such as inaccurate test data, and achieve the effects of simple operation, easy promotion and high efficiency of equipment

Active Publication Date: 2014-07-30
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a test method for simulating the direct reduction of iron ore using a coke reactivity measuring device, which simulates the reaction of iron ore in shaft furnaces, rotary hearth furnaces, tunnel kilns, rotary kilns and other equipment under laboratory conditions. Direct reduction process to solve the problem of inaccurate experimental data due to the limitation of laboratory test conditions in the research of iron ore direct reduction technology

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  • Test method for simulation of iron ore direct-reduction by coke reactive determination device

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Embodiment 1

[0034] A test method utilizing a coke reactivity measuring device to simulate the direct reduction of iron ore, comprising the following steps:

[0035] Step 1: Weigh 230g of specularite raw ore with a particle size of 8-15mm, 50g of semi-coke with a particle size of 1-3mm and a fixed carbon content of 73%, 50g of semi-coke with a particle size of 3-5mm and a fixed carbon content of 73% , 40g of semi-coke with a particle size of 1-3mm was laid on the bottom layer of the high-temperature reaction tube, 115g of specularite ore was laid on it, 30g of mixed semi-coke was laid on the middle layer, and 115g of specularite ore was laid, and the remaining 30g Mixed semi-coke lays the upper layer;

[0036] Step 2: Put the high-temperature reaction tube into the high-temperature reaction furnace, connect the gas pipeline, and quickly raise the temperature of the high-temperature reaction furnace to 1100°C, and the reaction time is 60 minutes; when the temperature reaches 800°C, use an a...

Embodiment 2

[0046] A test method utilizing a coke reactivity measuring device to simulate the direct reduction of iron ore, comprising the following steps:

[0047] Step 1: Weigh 200g of iron concentrate oxidized pellets, 45g of semi-coke with a particle size of 1-3mm and a fixed carbon content of 80%, 45g of semi-coke with a particle size of 3-5mm, and a fixed carbon content of 80%. Lay 3-5mm semi-coke on the bottom layer of the high-temperature reaction tube, lay 100g of iron concentrate oxidized pellets on it, then lay 30g of mixed semi-coke on the middle layer, and then lay 100g of specular iron ore. 30g semi-coke of ~3mm is laid on the upper layer;

[0048] Step 2: Put the high-temperature reaction tube into the high-temperature reaction furnace, connect the gas pipeline, and quickly raise the temperature of the high-temperature reaction furnace to 1170°C, and the reaction time is 120 minutes; when the temperature reaches 800°C, use an air bag with a capacity of 2L to start collectin...

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Abstract

The invention relates to the technical field of metallurgy and discloses a test method for simulation of iron ore direct-reduction by a coke reactive determination device. The test method comprises the following steps of putting iron ore and reduced coal into the coke reactive determination device according to a mass ratio of 100: 30-100, carrying out a direct-reduction test at a reduction temperature of 950-1200 DEG C for 60-120min, wherein in the later period of the reduction reaction, when reduction gas pressure is reduced, CO2 gas is fed into the coke reactive determination device to improve a reduction medium concentration, and carrying out standing for 10-20min after electroreduction so that the iron ore is further reduced. The test method can simulate a direct reduction process of iron ore in devices such as a shaft furnace and a rotary kiln under laboratory conditions by the coke reactive determination device so that the relationship between an iron ore reduction temperature, reduction time, a CO2 feeding amount and continued reduction time, and reduced ground concentrate powder iron grade and a metallization rate is determined, and a relationship among an iron ore reduction reaction rate, the CO2 feeding amount and an exhaust gas generation amount is determined. The test method can provide reliable parameters for iron ore direct reduction.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a test method for simulating the direct reduction of iron ore by using a coke reactivity measuring device. Background technique [0002] The direct reduction technology uses non-coking coal as a reducing agent to produce metallized charges for blast furnaces or converters at a temperature lower than the softening temperature of iron ore. The equipment commonly used in laboratories for the direct reduction of iron ore includes muffle furnaces and miniature rotary kilns. Since the material in the muffle furnace is relatively static and heated on one side when roasting iron ore, the temperature uniformity of the roasted material is poor, and the material cannot be roasted in a relatively high reducing atmosphere, resulting in the roasting quality of the iron ore. Poor; During the iron ore roasting process of the rotary kiln, although the rotation of the kiln body can improve the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/00
Inventor 王明华雷鹏飞展仁礼权芳民苏群王建平付涛张学
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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