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Slag weight estimation method and slag weight estimation device

A technology for weight and slag, applied in the field of slag discharge weight estimation and slag discharge weight estimation device, can solve the problem of inability to apply desiliconization to slag, and achieve the effects of improving iron yield, reducing slag production, and suppressing heat loss

Active Publication Date: 2018-11-09
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the method described in Japanese Patent Application Laid-Open No. 2007-308773 cannot be applied to the foamed slag after desiliconization or dephosphorization.

Method used

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  • Slag weight estimation method and slag weight estimation device
  • Slag weight estimation method and slag weight estimation device
  • Slag weight estimation method and slag weight estimation device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The slagging operation was carried out in a 350 ton scale top-bottom blown converter, and the slagging weight of the slag was estimated. The inner diameter of the furnace mouth of the converter is about 4.6m, the inner diameter of the cylindrical main body of the converter is about 6.6m, and the distance from the upper end of the cylindrical main body to the furnace mouth is about 2.7m.

[0056] First, by using computational fluid dynamics, the volume flow rate Q of the slag discharged from the converter is calculated using the shape of the converter and the assumed time-dependent change pattern of the tilt angle of the converter as calculation input conditions. S , and make the tilting speed of the converter and the volume flow Q of the slag discharged from the converter S The relationship produces a corresponding regression. Then, by substituting the tilting speed obtained from the time-dependent change in the tilting angle of the converter during the slagging operat...

Embodiment 2

[0060] The slagging operation was carried out several times, and in each operation, the estimated value of the slagging weight of the slag was derived using the method of the embodiment of the disclosed technology. Furthermore, in each operation, the estimated value of the discharged slag weight of slag was derived using the method (comparative example 1) by an operator and the method described in Unexamined-Japanese-Patent No. 2007-308773 (comparative example 2). In addition, in each operation, the slag discharge weight of the slag was obtained by weighing the real value with a scale. In addition, in the estimation of the slag discharge weight of the slag performed using the method described in Japanese Patent Laid-Open No. 2007-308773 (Comparative Example 2), the weight of the slag remaining in the converter is estimated from the final inclination angle of the converter. Volume, the volume density of the slag remaining in the converter is kept constant, and the slag discharg...

Embodiment 3

[0064] Using the same converter as in Example 1, a test for evaluating the effect of reducing the amount of auxiliary raw materials used was implemented. After putting scraps and molten pig iron into the converter, according to the amount of molten pig iron and silicon concentration, auxiliary raw materials such as quicklime are charged into the converter, and the molten iron is dephosphorized so that the alkalinity of the slag falls within a predetermined range. Thereafter, the converter is tilted to discharge a part of the slag in the upper layer from the furnace mouth, and then the converter is vertically erected again and auxiliary raw materials are added to continue the decarburization treatment. At this time, the slag discharge weight of the slag is estimated by the method of the embodiment of the disclosed technology and the conventional method of visually observing by an operator, and the amount of the auxiliary raw material to be added in the decarburization treatment ...

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Abstract

In the present invention, the following procedure is performed to estimate the weight of slag removed from a converter furnace in a removal operation in which, after desiliconization and dephosphorization in the converter furnace, the converter furnace is tilted to remove slag from the converter furnace while leaving molten iron in the converter furnace. A volumetric flow rate transition is derived which estimates a change over time in the volumetric flow rate of slag removed from the converter furnace. A bulk density transition is derived which estimates a change over time in the bulk densityof the slag removed from the converter furnace. A value obtained by adding up the products of the volumetric flow rates and the bulk densities of the slag at corresponding time points of the volumetric flow rate transition and the bulk density transition is derived as an estimated value of the weight of the slag removed from the converter furnace.

Description

technical field [0001] The disclosed technology relates to a slag weight estimating method and a slag weight estimating device for estimating the weight of slag discharged from a converter. Background technique [0002] It is known that after performing desiliconization treatment for removing silicon as an impurity or dephosphorization treatment for removing phosphorus as an impurity from molten pig iron in a converter, it is known to tilt the converter with molten iron remaining in the converter to make the upper layer of slag A part of the molten iron flows down from the furnace mouth to the slagging pot arranged under the converter to discharge the slag, and then the converter is erected again, and auxiliary raw materials such as quicklime (mainly composed of CaO) are added to continue refining the molten iron. [0003] In this method, the slag is foamed (foamed) in the converter to increase the total volume of the slag, thereby facilitating the discharge of the slag and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/02C21C1/04C21C5/46
CPCC21C1/02C21C1/04C21C5/46C21C7/0087
Inventor 内藤宪一郎浅原纪史中切孝夫松永邦俊
Owner NIPPON STEEL CORP
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