A method for increasing the carbon content of molten iron

A technology of molten iron and recarburizer, applied in the field of iron and steel metallurgy, can solve the problems of poor carburization effect and low carbon absorption rate, and achieve the effects of low cost, high carbon absorption rate and simple steps and methods

Active Publication Date: 2018-08-14
河北瑞欧消失模科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for carburizing molten iron to solve the problems of low carbon absorption rate and poor carburizing effect in existing methods for carburizing molten iron

Method used

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  • A method for increasing the carbon content of molten iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 85kg of recarburizer graphite powder with an effective carbon content of 90% and 1 ton of molten iron at a temperature of 1600°C into a 1.5-ton furnace, preheat the No. 1 molten iron ladle to 650°C in advance, and pour the graphite powder and molten iron into 1 In No. 2 molten iron ladle, part of the graphite powder is dissolved in the molten iron, and the excess graphite powder cannot be directly dissolved in the molten iron and floats on the surface of the molten iron; preheat the No. 2 molten iron ladle to 650°C in advance to remove the graphite powder It takes 10 seconds to pour molten iron from No. 1 ladle into No. 2 ladle. In the initial stage of pouring, an iron rod is needed to flow the graphite powder floating on the surface of the molten iron into the No. 2 ladle along with part of the molten iron. The carburizing agent is dissolved in molten iron to complete the carburizing process.

Embodiment 2

[0016] Add 320kg of recarburizer graphite powder with an effective carbon content of 92% and 4 tons of molten iron at a temperature of 1450°C into a 5-ton furnace, preheat the No. 1 molten iron ladle to 600°C in advance, and pour the graphite powder and molten iron into 1 In No. 2 molten iron ladle, part of the graphite powder is dissolved in the molten iron. The excess graphite powder cannot be directly dissolved in the molten iron and floats on the surface of the molten iron. Preheat the No. 2 molten iron ladle to 700°C in advance to remove the graphite powder floating on the surface of the molten iron. It takes 18 seconds to pour molten iron from No. 1 ladle into No. 2 ladle. In the initial stage of pouring, iron rods are used to first flow graphite powder floating on the surface of molten iron into No. 2 ladle along with part of the molten iron. Heat the No. 3 molten iron ladle to 660°C, pour the molten iron and the graphite powder floating on the surface of the molten iron...

Embodiment 3

[0018] Add 180kg of recarburizer graphite with an effective carbon content of 91% and 2 tons of molten iron at a temperature of 1500°C into a 3-ton furnace, preheat the No. 1 molten iron ladle to 680°C in advance, and pour graphite powder and molten iron into No. 1 In the molten iron ladle, part of the graphite is dissolved in the molten iron, and the excess graphite cannot be directly dissolved in the molten iron and floats on the surface of the molten iron. Preheat the No. 2 molten iron ladle to 670°C in advance, and use 13s for the graphite and molten iron floating on the surface of the molten iron Pour from No. 1 molten iron ladle to No. 2 molten iron ladle. In the initial stage of pouring, iron hooks should be used to first flow the graphite floating on the surface of the molten iron into the No. 2 molten iron ladle along with part of the molten iron, so that the recarburizer can be dissolved. In molten iron, the carburization process is completed.

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Abstract

The invention discloses a molten iron recarburization method. A carburant and molten iron are added in a molten iron container. When the excessive carburant cannot be directly dissolved in molten iron and floats on the surface of the molten iron, the molten iron and the carburant are poured into the other molten iron container at least one time from one molten iron container. The temperature of the molten iron is controlled to range from 1,450 DEG C to 1,700 DEG C, and each time used when the molten iron and the carburant are poured into the other molten iron container from one molten iron container is controlled to be within 20 s. According to the provided method, the problem that according to a stirring method in the prior art, when the content of carbon in the molten iron reaches a certain proportion in the recarburization process, increasing is very difficult to achieve is solved; a specially-made stirring machine is not needed, the carbon absorbing rate is high, cost is low, efficiency is high, and safety and production stability are high. Most importantly, the carbon content of the molten iron reaches 4.5 % through a stirring method; and by means of the method, the carbon content can reach 6% or above, the method is simple and easy to operate, and the method is very suitable for industrial production and application.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a method for increasing carbon in molten iron. Background technique [0002] With the continuous development of iron and steel casting technology, the amount of steel scrap added in casting is gradually increasing. In order to make its performance meet the requirements of steel specifications, the industry usually uses carburizing agents to increase the refining rate and reduce the scrap rate. The carburizer is carbon that exists in the form of a simple substance, and its melting temperature is 3727°C. It generally cannot be melted at the temperature of molten iron. Therefore, the carbon in the carburant is mainly dissolved in molten iron through dissolution and diffusion. At present, the main method for carburizers in the industry to increase the carbon content of molten iron is to stir to dissolve and diffuse carbon. Although this method has always been the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/00
CPCC21C7/0025
Inventor 赵清祯巩运涛赵清禄
Owner 河北瑞欧消失模科技有限公司
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