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Method for smelting low-silicon pig iron by using iron ore with complex mineral structure

A low-silicon pig iron and iron ore technology, applied in the field of ironmaking, can solve problems such as reducing the cost of ore, reducing the quality of sintered ore, and increasing the proportion of limonite, so as to reduce the cost of ore, achieve good economic benefits, and optimize the use of The effect of mine structure

Active Publication Date: 2020-10-09
红河钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In recent years, the shortage of high-quality resources and the continuous increase of logistics costs have significantly reduced the use efficiency of imported mines and domestic long-distance rich mines.
With the gradual increase in the cost pressure of the steel market, the advantages of high cost performance in the use of local and surrounding ores in Honggang have been reflected. In addition, tin factories, aluminum factories, and copper factories in the surrounding areas of Honghe River produce a large amount of iron-containing tailings during the production process. However, these resources are typical "cooked ore", with extremely poor sintering performance and high content of harmful elements. If these tailings can be utilized, waste can be turned into treasure, which can further reduce the cost of mining for enterprises
However, in the process of resource localization and rational utilization, due to the variety of ores, the increase in the proportion of limonite, the unstable composition, low grade, and the gradual increase of harmful impurity elements, the quality of sinter ore, the blast furnace slagging process, and the gas and liquid permeability in the furnace are greatly affected. , hearth working condition, furnace body furnace type, air flow distribution, etc. have all brought adverse effects, which pose a severe challenge to blast furnace ironmaking to achieve balanced and stable production, obtain stable technical and economic indicators, and reduce pig iron smelting costs
[0003] From the mineral properties of iron ore, Fe 2 o 3 easily reduced, and Fe 3 o 4 Difficult to reduce, 2FeO·SiO 2 It is more difficult to restore, so limonite has the best reducibility in the ore, followed by hematite, and magnetite is difficult to restore, but because of the characteristics of strong assimilation and high crystal water content, limonite is limonite Sintering brings three adverse effects: 1) A large number of pores are left after the removal of crystal water, and its existence provides a large number of gas transmission channels, which reduces the mineralization time of sinter and reduces the quality of sinter; 2) brown The looseness of the iron ore body is not suitable for the ball core of the sintering mixture; 3) The assimilation temperature of limonite is low, and the internal pores will be surrounded by the liquid phase without densification during sintering, which deteriorates the output and quality indicators of the sintered ore

Method used

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  • Method for smelting low-silicon pig iron by using iron ore with complex mineral structure
  • Method for smelting low-silicon pig iron by using iron ore with complex mineral structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] A method for smelting low-silicon pig iron using iron ore with a complex mineral structure, comprising the steps of:

[0064] Step (1), prepare the following raw materials according to the following mass percentages:

[0065] ① Limonite 40%;

[0066] ② Non-ferrous smelting iron-containing tailings and secondary resources 10%;

[0067] ③ fine-grained magnetite concentrate 23%;

[0068] ④ Fine-grained vanadium-titanium magnetite concentrate 5%;

[0069] ⑤ Hematite 5%;

[0070] ⑥SYP synergist 0.028%;

[0071] ⑦ Dolomite 3.5%;

[0072] ⑧Limestone 6%;

[0073] ⑨ quicklime 2%;

[0074] ⑩The balance of char end; total 100%;

[0075] The basicity of sintered ore is controlled by 2.2-2.5 times;

[0076] In step (2), mix the raw materials ①-⑤ prepared in step (1), then build a pile, remove the head and tail of the pile, and take the middle part of the pile to mix the ore;

[0077] Step (3), mix the middle mixed ore obtained in step (2) with the remaining raw materials p...

Embodiment 2

[0083] A method for smelting low-silicon pig iron using iron ore with a complex mineral structure, comprising the steps of:

[0084] Step (1), prepare the following raw materials according to the following mass percentages:

[0085] ① Limonite 48%;

[0086] ② Non-ferrous smelting iron-containing tailings and secondary resources 5%;

[0087] ③Fine-grained magnetite concentrate 18%;

[0088] ④ fine-grained vanadium-titanium magnetite concentrate 6%;

[0089] ⑤ Hematite 5.7%;

[0090] ⑥SYP synergist 0.030%;

[0091] ⑦ Dolomite 3.57%;

[0092] ⑧Limestone 6.1%;

[0093] ⑨Lime 2.1%;

[0094] ⑩ end of coke 5.5%;

[0095] The basicity of sintered ore is controlled by 2.2-2.5 times;

[0096] In step (2), mix the raw materials ①-⑤ prepared in step (1), then build a pile, remove the head and tail of the pile, and take the middle part of the pile to mix the ore;

[0097] Step (3), mix the middle mixed ore obtained in step (2) with the remaining raw materials prepared in step (1)...

Embodiment 3

[0110] A method for smelting low-silicon pig iron using iron ore with a complex mineral structure, comprising the steps of:

[0111] Step (1), prepare the following raw materials according to the following mass percentages:

[0112] ① Limonite 40.5%;

[0113] ② Non-ferrous smelting iron-containing tailings and secondary resources 5.5%;

[0114] ③Fine-grained magnetite concentrate 18.5%;

[0115] ④ Fine-grained vanadium-titanium magnetite concentrate 5.1%;

[0116] ⑤ Hematite 5.368%;

[0117] ⑥SYP synergist 0.032%;

[0118] ⑦ Dolomite 5.5%;

[0119] ⑧Limestone 8%;

[0120] ⑨ quicklime 4%;

[0121] ⑩ coke powder 7.5%;

[0122] The basicity of sintered ore is controlled by 2.2-2.5 times;

[0123] In step (2), mix the raw materials ①-⑤ prepared in step (1), then build a pile, remove the head and tail of the pile, and take the middle part of the pile to mix the ore;

[0124] Step (3), mix the middle mixed ore obtained in step (2) with the remaining raw materials prepared ...

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Abstract

The invention relates to a method for smelting low-silicon pig iron by using iron ore with a complex mineral structure, and belongs to the technical field of ironmaking. The method comprises the following steps of uniformly mixing limonite, nonferrous smelting iron-containing tailings, secondary resources, fine-grained magnetite concentrate, fine-grained vanadium-titanium magnetite concentrate andhematite, piling, taking the uniformly mixed ore in the middle of a material pile, mixing the uniformly mixed ore with SYP synergist, dolomite, limestone, quicklime and coke powder, pelletizing, sintering the obtained pellets to obtain a finished product sinter, crushing, spraying a CaCl2 solution, screening, and blending the sintered ore with the particle size of more than 5mm, the pellet ore and the lump brown iron ore into a blast furnace for blast furnace smelting to obtain a low-silicon qualified pig iron. According to the method, secondary resource reutilization is achieved, on one hand, environmental pollution is reduced, meanwhile, the production cost can be saved, and application and popularization are easy.

Description

technical field [0001] The invention belongs to the technical field of ironmaking, and in particular relates to a method for smelting low-silicon pig iron by using iron ore with complex mineral structure. Background technique [0002] In recent years, the shortage of high-quality resources and the continuous increase of logistics costs have significantly reduced the use efficiency of imported ore and domestic long-distance rich ore. With the gradual increase in the cost pressure of the steel market, the advantages of high cost performance in the use of local and surrounding ores in Honggang have been reflected. In addition, tin factories, aluminum factories, and copper factories in the surrounding areas of Honghe River produce a large amount of iron-containing tailings during the production process. However, these resources are typical "cooked mines", with extremely poor sintering performance and high content of harmful elements. If these tailings can be utilized, waste can ...

Claims

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Application Information

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IPC IPC(8): C21B5/00C22B1/16
CPCC21B5/008C22B1/16
Inventor 普松高连坤董瑜杨凯李建飞
Owner 红河钢铁有限公司
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