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Iron ore sintering method by using light-burnt magnesium ball

A sintering method, a technology of lightly burned magnesium, applied in the field of iron ore sintering, can solve problems such as high price, increased fuel consumption and emissions, and dust pollution, and achieve the effect of improving sintering utilization coefficient and optimizing production technical indicators

Active Publication Date: 2018-05-25
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Xia Shiyuan, Shen Aimin, etc. introduced "Experimental Research and Application of Jinan Iron and Steel Sintering with Composite Light-burned Magnesium Powder" (Jiangxi Metallurgy, 2013, Vol.33, No.6, P1-5), and experimentally studied the composite light-burned magnesium powder. The effect of magnesium powder replacing light-burned dolomite powder on sintering production indicators. The powdery (grain size 0-325 mesh accounts for more than 90%) light-burned magnesium powder MgO content is 90.74%. The sintering cup test results show that the use of composite light-burned magnesium After pulverization, the sintering utilization coefficient, vertical sintering speed, yield, drum index, and low-temperature reduction pulverization index all improved, but at the same time, the solid fuel consumption of sintering also increased by 1.7kg / t, and the alkalinity also increased by 0.04 , and the use of composite light-burned magnesium powder improves fuel consumption and emissions while improving the production and quality indicators of sintered ore
The reasons for restricting the popularization of this technology include two points: one is the high price of high-purity light-burned magnesium powder (containing more than 90% MgO); the other is that the transportation process of ultra-fine light-burned magnesium powder will bring dust and other pollution

Method used

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  • Iron ore sintering method by using light-burnt magnesium ball
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The raw materials of this embodiment are shown in Table 2. Lightly burned magnesia balls 1 are prepared in proportion to iron ore powder, returned ore, coke powder, quicklime, and limestone powder, and then mixed with water, granulated, distributed, ignited, sintered, Cooling and crushing to obtain finished sintered ore, the specific operation steps are as follows:

[0057] Lightly burned magnesia balls with a particle size of 5-20mm, iron ore powder with a particle size of 0-8mm, returned ore with a particle size of 0-5mm, coke powder with a particle size of 0-3mm, quicklime with a particle size of 0-3mm and 0~3 Limestone powders are mixed according to the above ratio, then add 7.5% water to mix evenly, and the mixing time is 2 minutes; the mixed materials are granulated, and the granulation time is 5 minutes, and the prepared granules are placed in the After sintering the cup with a diameter of 300mm, it will be formed as figure 1 For the mosaic structure shown, the...

Embodiment 2

[0069] The batching structure shown in Table 2 was adopted, and the experimental procedure was referred to Example 1. The most significant difference between Example 2 and the benchmark test is that 1.5% light burnt magnesium ball 1 is used to replace dolomite to provide MgO, the iron grade and binary basicity of the sintered ore are basically unchanged, and the MgO content is increased from 1.44% to 1.70 %. The utilization coefficient of sintering is changed from 1.67t / m 2 *h increased to 1.76t / m 2 *h, that is, the increase in output reaches 5.4%. It can be seen that the block-shaped high-temperature-resistant light-burned magnesium balls in the sintered material layer do play a role in improving the air permeability of the material layer, so the vertical sintering speed and utilization factor are both increased. The drum index decreased slightly, the yield increased, the solid fuel consumption decreased, and the maximum waste gas temperature of sintering increased from 50...

Embodiment 3

[0071]The batching structure shown in Table 2 was adopted, and the experimental procedure was referred to Example 1. In Example 3, the proportion of light-burned magnesium ball 1 was increased to 2.2%, the binary basicity of sintered ore remained unchanged, the iron grade decreased slightly, and the MgO content increased from 1.44% to 2.20%. The utilization coefficient of sintering is changed from 1.67t / m 2 *h increased to 1.75t / m 2 *h, the yield increased by 4.8%. The drum index decreased slightly, the yield increased slightly, the solid fuel consumption decreased, and the maximum waste gas temperature of sintering increased from 509.6°C to 552.3°C.

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Abstract

The invention discloses an iron ore sintering method by using light-burnt magnesium ball. During the iron ore sintering process, light-burnt magnesium ball, iron ore powder, return mine, coke powder,and a flux are configured in proportion, and then steps of uniform mixing by adding water, granulation, material distribution, ignition, sintering, cooling, and fragmentation are carried out to obtainan agglomerate finished product. The light-burnt magnesium ball can substitute dolomite powder, so that a sintering mineralization rate is increased, a reasonable mineral composition and an ore-phasestructure are obtained, the method can guarantee the requirement of blast-furnace smelting on an agglomerate chemical component MgO, cannot deteriorate a sintering process, and has important practical significance.

Description

technical field [0001] The invention relates to iron ore sintering, in particular to an iron ore sintering method using lightly burned magnesia balls. Background technique [0002] Sintering (draft sintering) is the most widely used iron-containing raw material agglomeration method in domestic and foreign iron and steel enterprises. The sintering process can be summarized as follows: the sintering mixture (iron-containing raw materials, fuel, flux and return ore, etc.) is mixed with an appropriate amount of water, and after mixing and granulating, it is spread on the trolley of the sintering machine, and the surface of the sintering material is ignited. , Under the action of the forced draft of the lower bellows, the fuel in the material layer burns from top to bottom and releases heat, and the mixture undergoes a series of physical and chemical changes under the action of high temperature, and finally consolidates into sinter. [0003] As a main raw material for blast furn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16C21B5/00
CPCC21B5/008C22B1/16
Inventor 李建毛晓明熊林沈红标彭新齐伟
Owner BAOSHAN IRON & STEEL CO LTD
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