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Steelmaking slag former and preparation method thereof

A steel-making slag-forming agent and slag technology, which is applied in the direction of improving process efficiency, can solve the problems of increasing molten steel temperature drop and affecting steelmaking production, etc., achieves fast melting speed, reduces molten steel temperature drop and energy consumption, and reduces ton The effect of steel consumption

Inactive Publication Date: 2012-12-05
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the steelmaking process, these substances will decompose and absorb heat, resulting in an increase in the temperature drop of molten steel and affecting steelmaking production
At present, there is no report on the common use of converter OG mud and LF slag as the main original slagging agent

Method used

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  • Steelmaking slag former and preparation method thereof

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Embodiment Construction

[0015] The various raw materials are formulated according to the following weight percentages: 70% of OG mud, 22% of steelmaking LF slag, 6% of coke powder, and 2% of binder. First use a twin-shaft mixer to mix the weighed various raw materials, and then enter the disc granulator for granulation. During the granulation process, the amount of water sprayed is 3-5% of the total weight of the raw materials. The finished pellets are dried in a belt dryer, and then sieved by a vibrating screen. The mesh diameter of the vibrating sieve is 7mm. Particles above 7mm are crushed by a crusher and then continue to enter the above-mentioned vibrating screen for screening. Particles below 7mm are dried and sent to the sintering machine for sintering. After the sintered intermediate material is crushed and screened, it becomes a block of 10~50mm, which is used as a slagging agent for steelmaking. The sintering temperature is controlled at 1000~1100°C. The belt dryer uses sintering flue g...

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Abstract

The invention discloses steelmaking slag former and a preparation method thereof and belongs to the technical field of ferrous metallurgy and solid waste recycling. The steelmaking slag former comprises the following components in percentage by weight: 60 to 70 percent of oxygen converter gas recovery sludge (OG), 20 to 30 percent of steelmaking low furnace (LF) slag, 5 to 10 percent of coke powder and 1 to 2 percent of bonder. The method comprises the following steps of: premixing raw materials by using a stirring system, pelletizing the raw materials by using a pelletizing system, partially premelting small balls and bonding the small balls into blocks by using a sintering system, and treating by using a crushing and screening system to finally obtain the steelmaking slag former of which the particle size is 10 to 50mm. The method has the advantages that the powdery wastes produced in a steelmaking process can be fully utilized and are also efficiently recycled, a high melting speed is achieved, and the steelmaking slag former is good in slagging effect.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy and solid waste resource utilization, and in particular relates to a steelmaking slagging agent and a preparation method thereof. technical background [0002] Converter sludge and pellets have been widely used as slagging agents in steelmaking production. At present, the focus of converter sludge as a slagging material is mainly cold consolidation. The slagging agent produced in this way mainly contains calcium hydroxide and calcium carbonate. During the steelmaking process, these substances will decompose and absorb heat, causing an increase in the temperature drop of molten steel and affecting steelmaking production. LF slag reuse in converter steelmaking also has a situation similar to that of converter sludge. At present, there is no report on the joint use of converter OG mud and LF slag as the main original slagging agent. LF slag is reused in converter steelmaking, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/248C21C7/076
CPCY02P10/20
Inventor 唐卫军赵胜利梁勇焦广武马刚平李世青王金花郝仲恺刘长树米士佳
Owner SHOUGANG CORPORATION
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