Method for improving air permeability of sinter layer

A technology of air permeability and material layer, applied in the field of iron and steel metallurgy, can solve the problems of poor air permeability and affect the sintering quality, etc., and achieve the effects of improving the air permeability, the utilization factor, the sintering efficiency and the sintering quality.

Active Publication Date: 2016-09-21
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Claims
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Problems solved by technology

[0003] In order to overcome the shortcomings of the existing sintering ingredients mainly composed of vanadium-titanium concentrate, which have poor air permeability during the sintering process and affect the sintering quality, the technical problem to be solved by the present invention is to provide a method that can improve the air permeability of the sintered material layer

Method used

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Experimental program
Comparison scheme
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Embodiment

[0023] Raw material ratio for sintering as described in the following table:

[0024] Table 1 Proportion of raw materials for sintering (%)

[0025] white horse concentrate

Hirakawa Concentrate

Gross mine

medium powder

limestone

Active Ash

Scorched powder

Gas Ash

Dust

Return to mine

58

8

7

7

5

6

4

3

2

30

[0026] The main physical and chemical indicators of the raw materials used above are:

[0027] White horse concentrate ω (TFe) 54-56%, ω (SiO 2 )30%, ω(TiO 2 )>10.0%, ω particle size is less than 0.074mm>70%;

[0028] Pingchuan concentrate ω(TFe)>61%, ω(SiO 2 )2 o 3 )2 )<0.5%;

[0029] Raw ore ω(TFe)>60%, ω(SiO 2 )>13%, ω(Al 2 o 3 )<1.0%, ω(CaO)<1.0%;

[0030] Medium powder ω(TFe)>44%, ω(SiO 2 )>13%, ω(Al 2 o 3 )<4.0%, ω(CaO)<8.0%

[0031] Active ash ω (CaO) 86-90%;

[0032] Limestone ω (main component CaO) 50-53%, ω (particle size <3.0mm) = 100%;

[0033] Coke powder ash con...

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PUM

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Abstract

The invention relates to the technical field of steel smelting and discloses a method for improving the air permeability of a sinter layer. The method includes the following steps that firstly, sintering raw materials are blended according to the specific proportion and put into a material mixing bin, water is added to a material mixing machine, mixing is conducted, then the mixed sintering raw materials are put into a sintering cup, the sinter layer is equally divided into two to four parts in the charging process, a layer of finished sintered ores is arranged when every equal division line is reached in the charging process, and finally ignition, ventilation and sintering are conducted on the prepared sintering raw materials and the sintering cup of the finished sintered ores. The method has the beneficial effects that in the processes of sintering and material distribution, the sinter layer is equally divided according to the thickness of the sinter layer, the finished sintered ores are evenly distributed in the middles on the equal division lines, consequently the situation that the air permeability becomes worse due to the fact that moisture of the mixed material gathers downwards along with sintering and ventilation in the sintering process can be improved, the speed of a sintering machine is increased, the usage coefficient is increased, and thus sintering efficiency and sintering quality are improved.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for improving the air permeability of a sintered material layer. Background technique [0002] For sintering ingredients mainly composed of vanadium-titanium concentrate, the proportion of vanadium-titanium concentrate is relatively high, reaching more than 58%, and the particle size is relatively fine, and the TFe content is low, only about 55%. There is a lot of medium powder, which directly leads to poor air permeability of the sintered material layer. On the other hand, the TiO2 content in the raw materials generally reaches more than 10%, which leads to poor hydrophilicity of vanadium-titanium concentrate, poor granulation effect during the mixing process, and more free powder. The detachment from the surface layer into the lower part of the material will increase the moisture content of the lower part of the mixture, and the powdery material will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
CPCC22B1/16
Inventor 胡鹏付卫国唐文博
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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