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Method for reclaiming and cyclic utilizing residue molten steel slag in steel making

A steel slag recovery and waste heat technology, which is applied in the direction of recycling technology, process efficiency improvement, blast furnace parts, etc., can solve the problems of insufficient desulfurization and deoxidation capabilities, insufficient use of heat, and environmental pollution caused by waste steel slag. Achieve the effects of improving the fluidity of slag, satisfying fast-paced production, and reducing production costs

Inactive Publication Date: 2008-10-08
HEBEI IRON AND STEEL
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Problems solved by technology

The above method has the following disadvantages: 1. The hot steel slag that still has a certain sulfur capacity and reducing property is discarded, and its desulfurization and deoxidation capabilities cannot be fully exerted; 2. A large amount of waste steel slag pollutes the environment; 3. The heat cannot be fully utilized , the next cycle uses cold slag material to make slag and the slag forming speed is slow, which is not conducive to energy saving and consumption reduction

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  • Method for reclaiming and cyclic utilizing residue molten steel slag in steel making

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Embodiment Construction

[0025] This embodiment is a method for heat recovery and recycling of waste hot steel slag empty ladle from continuous casting and rolling (CSP). see figure 1 , the process is carried out in turn as follows:

[0026] a. Pour waste heat steel slag into the empty ladle: After the CSP pouring is completed, hoist the steel ladle 8 containing the waste heat steel slag to the ladle crossing car 10 with a crane, and then drive the cross car 10 to the ladle to prepare for crossing , and then hoist the steel ladle 8 to the empty steel ladle 3 that is about to be tapped with a crane, and pour the residual hot steel slag poured from CSP in the steel ladle 8 into the empty steel ladle 3; Realize converter tapping.

[0027] b. Tapping: drive the ladle car carrying the ladle 3 of poured waste heat slag to the converter 1, and tap the ladle filled with poured waste heat slag; at the initial stage of tapping, the amount of bottom blowing argon is relatively large, and then the bottom blowin...

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Abstract

The method to pour residual hot steel sludge for recovery in steel production comprises: a. after casting, pouring the residual steel sludge into empty ladle; b. conveying the sludge to converter and tapping; c. refining; d. casting; repeating. This invention makes full use of the sulfur capacity and strong reducibility to absorb inclusion and improve liquid steel cleanness rapidly, overcomes the consumption for low-melting, and reduces pollution and cost.

Description

technical field [0001] The invention relates to a method for recycling steel-making waste heat steel slag, and belongs to the technical field of steel-making production technology. Background technique [0002] The main task of steelmaking production is to remove C, Mn, Si, S, P and other elements and inclusions in molten iron to a certain content range, and then add corresponding alloying elements to it according to the different types of steel to be smelted. Meet the requirements of steel grades for chemical composition. Due to the different thermodynamic and other conditions required to remove the above elements, the current steelmaking process generally adopts the production process of primary smelting, refining, and continuous steel casting. That is, by supplying oxygen to the primary smelting furnace, the C, Mn, Si, and other elements in the molten steel are oxidized to a certain content range, and at the same time, a part of oxygen remains in the molten steel. and t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B7/00C21B3/04C22C33/04
CPCY02P10/20Y02W30/50
Inventor 贾国生赵彦华朱坦华李任春
Owner HEBEI IRON AND STEEL
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