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Roasting method of efficiently controlling iron ores to be magnetized

An iron ore roasting technology, which is applied in the roasting field of efficiently controlling the magnetization of iron ore, can solve the problems of long reduction time, poor uniformity, and high content of harmful gases, so as to improve the diffusion capacity and thermal conductivity, improve the reduction temperature, and eliminate pollution effect

Active Publication Date: 2015-06-17
JIUQUAN IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a roasting method for efficiently controlling the magnetization of iron ore in view of the disadvantages of long reduction time, poor uniformity of ore magnetization roasting, and high content of harmful gases in tail gas in the iron ore roasting process in the prior art

Method used

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  • Roasting method of efficiently controlling iron ores to be magnetized
  • Roasting method of efficiently controlling iron ores to be magnetized
  • Roasting method of efficiently controlling iron ores to be magnetized

Examples

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Embodiment 1

[0026] A roasting method for efficiently controlling the magnetization of iron ore, the first step of limonite mFe 2 o 3 .nH 2 O is added from the top of the shaft furnace by the distributor of the shaft furnace, limonite mFe 2 o 3 .nH 2 O particle size is 15mm; the second step, the iron ore is dried and preheated through the preheating section of the shaft furnace; the third step, the iron ore is heated and heated at the burner of the shaft furnace through the heating section of the shaft furnace; Four steps, the iron ore is reduced through the reduction section of the shaft furnace with the reduction gas ejected from the reduction gas injection tower of the shaft furnace; the reduction temperature is 720°C, the reduction time is 1h, and the reduction gas is CO and H 2 The mixed gas, which reduces the H in the gas 2 The volume fraction is 15%, and the flow rate of the reduced gas ejected from the reduced gas injection tower is 1200m 3 / h, the pressure of the ejected red...

Embodiment 2

[0028] A roasting method for efficiently controlling the magnetization of iron ore, the first step of hematite Fe 2 o 3 Feed from the top of the shaft furnace by the distributor of the shaft furnace, hematite Fe 2 o 3 The particle size is 100mm; in the second step, the iron ore is dried and preheated through the preheating section of the shaft furnace; in the third step, the iron ore is heated and heated at the burner of the shaft furnace through the heating section of the shaft furnace; the fourth step In the first step, the iron ore is reduced through the reduction section of the shaft furnace with the reduction gas ejected from the reduction gas injection tower of the shaft furnace; the reduction temperature is 700°C, the reduction time is 1.25h, and the reduction gas is CO and H 2 The mixed gas, which reduces the H in the gas 2 The volume fraction is 18%, and the flow rate of the reduced gas ejected from the reduced gas injection tower is 1000m 3 / h, the pressure of t...

Embodiment 3

[0030] A roasting method for efficiently controlling the magnetization of iron ore, the first step of hematite Fe 2 o 3 Feed from the top of the shaft furnace by the distributor of the shaft furnace, hematite Fe 2 o 3 The particle size is 100mm; in the second step, the iron ore is dried and preheated through the preheating section of the shaft furnace; in the third step, the iron ore is heated and heated at the burner of the shaft furnace through the heating section of the shaft furnace; the fourth step In the first step, the iron ore is reduced through the reduction section of the shaft furnace with the reduction gas ejected from the reduction gas injection tower of the shaft furnace; the reduction temperature is 680°C, the reduction time is 1.5h, and the reduction gas is CO and H 2 The mixed gas, which reduces the H in the gas 2 The volume fraction is 12%, and the flow rate of the reduced gas ejected from the reduced gas injection tower is 1100m 3 / h, the pressure of the...

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Abstract

The invention relates to a roasting method of efficiently controlling iron ores to be magnetized. The method comprises the following steps: by virtue of agile adjustment of components, flow and pressure of reduced gas, improving the content of hydrogen in the reduced gas; controlling the content of hydrogen at 15%+ / -3%; greatly improving the diffusivity and thermal conductance of the reduced gas; obtaining the optimal effect of the roasting method of efficiently controlling iron ores to be magnetized. Meanwhile, aiming at the problem that the reduced gas in the roasting method excessive, the reduced gas is reduced from 1800-2000m<3> / h to 1000-1200m<3> / h, the consumption of the reduced gas is reduced by 800m<3> / h, the production cost is lowered, and the environmental pollution by CO in exhaust gases in a shaft furnace is eliminated. The reducing temperature of the iron ores is improved to 680-720 DEG C, and a good reducing temperature is provided for reducing block iron ores. Meanwhile, the pressure of the reduced gas is controlled at 5000Pa+ / 200Pa, so that the iron ores can be fully and uniformly roasted.

Description

technical field [0001] The invention belongs to the technical field of iron ore roasting, and in particular relates to a roasting method for efficiently controlling the magnetization of iron ore. Background technique [0002] The shaft furnace is mainly a type of furnace for processing lump ore. The use of shaft furnaces for large-scale industrial magnetization roasting production was first built in Anshan, my country in 1926, so it is called "Anshan type shaft furnace". The magnetization roasting shaft furnace is to heat the ore in the shaft furnace to a certain temperature through the preheating section and the heating section, and then carry out physical and chemical reactions in the reducing atmosphere of the reducing section, so that the weakly magnetic hematite and other iron oxide ore It is a device that transforms the material into a strong magnetic magnetite, which can be treated by a weak magnetic field magnetic separation method after cooling. [0003] Jiuquan Ir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02
Inventor 王明华张志刚展仁礼权芳民马胜军李慧春郭忆张科
Owner JIUQUAN IRON & STEEL GRP
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