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Sintering method of iron ore with added limonite

A sintering method, limonite technology, applied in the field of metallurgy, can solve problems such as unsatisfactory strengthening effect, optimization of processing parameters, etc., and achieve the effect of high practical value, eliminating bursting phenomenon, and strengthening sintering

Inactive Publication Date: 2013-02-13
PANGANG GROUP RESEARCH INSTITUTE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, iron and steel enterprises and scientific research institutes at home and abroad have conducted a large number of experimental studies on limonite sintering technology. In production, such as increasing the height of the material layer, increasing the alkalinity, increasing the fuel ratio and increasing the particle size of the fuel, and optimizing the reasonable ore mix. Strengthen technical measures such as controlling the ratio of limonite, but limited to the constraints of technological conditions and technical level, these technical measures are subject to certain restrictions in production and application, usually only one or two technologies are used in the same factory, and there is no specific The processing parameters are fully optimized, so the strengthening effect is not ideal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0021] Adopt the above iron ore sintering method with limonite added, wherein the finely ground limonite particle size is below 1mm and the part of the finely ground limonite particle size below 0.074mm accounts for 15wt% of the total weight; The moisture content in the material is 7.3wt%; the pressing amount is 20mm.

[0022] The results show that compared with the reference period (i.e. not adopting the production period of the present invention), the drum strength of the sintered ore improves by 0.84%, the yield increases by 3.17%, the output improves by 1.36%, and the low-temperature reduction pulverization rate of the sintered ore (RDI -3.15 ) from 59.82% to 58.64%, down 1.18%; sinter reduction degree increased 0.72%.

example 2

[0024] Adopt the above iron ore sintering method with limonite added, wherein the finely ground limonite particle size is below 1mm and the part of the finely ground limonite particle size below 0.074mm accounts for 25wt% of the total weight; mixing The moisture content in the material is 7.4wt%; the pressing amount is 30mm.

[0025] The results show that compared with the base period, the drum strength of sintered ore increased by 1.23%, the yield increased by 3.65%, and the output increased by 1.84%. -3.15 ) from 59.82% to 58.07%, down 1.75%; sinter reduction degree increased 0.90%.

example 3

[0027] Adopt the above iron ore sintering method with added limonite, wherein the finely ground limonite particle size is below 1mm and the finely ground limonite particle size below 0.074mm accounts for 40wt% of the total weight; mixing The moisture content in the material is 7.5wt%; the pressing amount is 40mm.

[0028] The results show that compared with the base period, the tumbler strength of sintered ore increased by 1.78%, the finished product rate increased by 4.12%, and the output increased by 2.31%. -3.15 ) decreased from 59.82% to 57.76%, a decrease of 2.06%; the degree of reduction of sintered ore increased by 1.17%.

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Abstract

The invention provides a sintering method of iron ore with added limonite. The sintering method of the iron ore with the added limonite comprises the steps of limonite fine grinding treatment, limonite roasting treatment, batching, mixing, material distribution, material pressing and sintering with fire, wherein the granularity of the ground limonite is controlled to be below 1mm, the ground limonite is roasted at the temperature of 180-220 DEG C, the water content of the mixed material is controlled to be 7.3-7.6 wt%, and the quantity of the pressed materials in the step of material pressing is controlled to be 20-50 mm. The sintering method of the iron ore with the added limonite is capable of eliminating the explosion phenomenon in the sintering process of the coarse-grain limonite, improves the strength and the yield of sintered ore, improves the quality of the sintered ore, can reduce the content of crystal water in the limonite, is favorable for sintering, can reduce the consumption of fuel, improves the grain composition of the mixed materials, and improves the air permeability of material layers, thereby improving the yield and the quality of the sintered ore. In addition, the sintering method of the iron ore with the added limonite is capable of improving the compactness of the material layers, improves the structure of the sintered ore, controls the sintering speed at the same time, improves the metallurgical performance of the sintered ore, and is favorable for improving the techno-economic indicators of a blast furnace process.

Description

technical field [0001] The invention relates to a sintering technology in the field of metallurgy, in particular to an iron ore sintering method in which limonite is added. Background technique [0002] The iron-containing raw materials used in the sintering of iron and steel enterprises in Panxi area are mainly high-titanium vanadium-titanium magnetite concentrates (accounting for more than 60% of iron-containing materials). This type of iron ore has TiO 2 、Al 2 o 3 , MgO content is high, SiO 2 Low content, poor hydrophilicity and granulation performance, and easy to form brittle perovskite, silicate and other binder phases in the sintering process, resulting in poor sinter strength, low yield, and return rate High and low temperature reducing pulverization rate (RDI -3.15 ) is high, and the technical and economic indicators of sintering are extremely poor. [0003] In order to strengthen sintering and improve the quality of sintering ore, metallurgists add some (20-30...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
Inventor 甘勤饶家庭何木光龙永伟刘龙全
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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