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Sintered ore modifier and preparation method and iron-making method

A technology of ore modifier and sintered ore, which is applied in the field of ironmaking, can solve the problems of increasing the pressure difference at the upper part of the blast furnace, deteriorating the gas permeability of the material layer, and affecting the forward movement of the blast furnace, so as to achieve the effect of reducing low-temperature reduction pulverization

Inactive Publication Date: 2012-07-11
SICHUAN DAZHOU IRON & STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] When using sintered ore to make iron, in the temperature range of 450-550°C in the upper part of the blast furnace, under the action of the gas reducing agent CO, the sintered ore is formed from hematite (α-Fe 2 o 3 ) reduced to maghemite (γ-Fe 2 o 3 ) during the phase transformation process, the volume will expand by about 10%, resulting in pulverization of the sintered ore and a decrease in strength; in addition, the SiO in the sintered ore 2 and CaO in the solvent form a crystal transformation product 2CaO·SiO during sintering 2 , the volume of the crystal transformation product expands by 10% when it changes from β-type to γ-type crystallization during the cooling process, which leads to low-temperature pulverization of sintered ore, deteriorates the gas permeability of the material layer, increases the pressure difference at the upper part of the blast furnace, and affects the smooth operation of the blast furnace
In order to suppress the occurrence of this phenomenon, the method of spraying calcium chloride solution with a solubility of about 3% on the surface of sintered ore is usually used to reduce the low-temperature pulverization rate of sintered ore to a certain extent, but the low-temperature powder of sintered ore rate is still high

Method used

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  • Sintered ore modifier and preparation method and iron-making method
  • Sintered ore modifier and preparation method and iron-making method
  • Sintered ore modifier and preparation method and iron-making method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The number of this example is 5-a, and it is measured and weighed according to the ratio of formula 5 in Table 1, wherein the concentration of the sinter modifier in the sinter modifier solution is prepared according to the formula of a in Table 2, and the prepared The sinter modifier is dissolved in the spray amount according to the formula a in Table 2 and is sprayed on the surface of the sinter, and then put into the reaction furnace for reduction reaction. It can be seen from Table 3 that the low-temperature pulverization performance of the sinter is better than that of no (Benchmark) The low-temperature pulverization performance of sintered ore has been significantly improved.

Embodiment 2

[0047] The number of this example is 5-b, and it is measured and weighed according to the proportion of formula 5 in Table 1, wherein the concentration of the sinter modifier in the sinter modifier solution is prepared according to the formula of b in Table 2, and the prepared The sinter modifier is dissolved in the spray amount according to the formula b in Table 2 and sprayed on the surface of the sinter, and then put into the reaction furnace for reduction reaction. It can be seen from Table 3 that the sinter is at a low temperature at RDI+3.15 The pulverization performance is the best, and the low temperature pulverization performance at RDI-0.5 is also ideal.

Embodiment 3

[0049] The number of this example is 4-c, and it is measured and weighed according to the proportion of formula 4 in Table 1, wherein the concentration of the sinter modifier in the sinter modifier solution is prepared according to the formula of c in Table 2, and the prepared The sinter modifier is dissolved in the spray amount according to the formula c in Table 2 and sprayed on the surface of the sinter, and then put into the reaction furnace for reduction reaction. It can be seen from Table 3 that the low-temperature pulverization performance of the sinter is better than that of no (Benchmark) The low-temperature pulverization performance of sintered ore has been significantly improved.

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Abstract

The invention discloses a sintered ore modifier and a preparation method. The sintered ore modifier comprises CaCl2, FeCl3 and NaCl. As the FeCl3 added to the sintered ore modifier is effectively bonded with an iron to ensure that a halogen ellement is adhered to the sintered ore surface and is simultaneously and effectively bonded with the sintered ore, pulverization of sintered ores is reduced; in addition, as NaCl is added to the sintered ores, the alkalinity of the sintered ores is improved, the pulverization of the sintered ores is further reduced and the purpose of improving the metallurgical performance of the sintered ores is achieved; and the components of the sintered ore modifier are convenient to obtain and simple to prepare and are beneficial for industrial production. Based on the sintered ore modifier and the preparation method, the invention discloses an iron-making method. The iron-making method comprises the following steps: mixing the sintered ore modifier with water to prepare a sintered ore modifier solution of a certain concentration; spraying the sintered ore modifier solution to the sintered ore surface according to a certain proportion; and reducing the sintered ores at a high temperature via a reducing agent to obtain iron. The low temperature pulverization rate of the sintered ores is decreased in the iron-making process, the energy utilization rate is improved, and the energy consumption is reduced, so that the efficiency is improved.

Description

technical field [0001] The invention relates to the field of ironmaking, in particular to a sinter modifier, a preparation method and an ironmaking method. Background technique [0002] When using sintered ore to make iron, in the temperature range of 450-550°C in the upper part of the blast furnace, under the action of the gas reducing agent CO, the sintered ore is formed from hematite (α-Fe 2 o 3 ) reduced to maghemite (γ-Fe 2 o 3 ) during the phase transformation process, the volume will expand by about 10%, resulting in pulverization of the sintered ore and a decrease in strength; in addition, the SiO in the sintered ore 2 and CaO in the solvent form a crystal transformation product 2CaO·SiO during sintering 2 During the cooling process, the volume of the crystal transformation product expands by 10% when it changes from β-type to γ-type crystal, which leads to low-temperature pulverization of sintered ore, deteriorates the gas permeability of the material layer, inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16C21B5/00
Inventor 王皎月邓孝天刘顺明汪洋
Owner SICHUAN DAZHOU IRON & STEEL GROUP
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