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Technology for KR liquid iron pretreatment desilicication and dephosphorization

A molten iron pretreatment and molten iron technology, which is applied in the field of iron and steel smelting, can solve problems such as deterioration of iron and steel material consumption indicators, splashing, impact on environmental protection production continuity, etc., and achieve considerable economic benefits, reduce iron and steel material consumption, and reduce the effect of silicon content.

Inactive Publication Date: 2020-03-17
山西建龙实业有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0004] The invention provides a KR molten iron pretreatment desiliconization and dephosphorization process, aiming to solve the problem that high silicon molten iron not only deteriorates the consumption index of iron and steel materials, but also easily causes splashing, which affects environmental protection and production continuity.

Method used

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  • Technology for KR liquid iron pretreatment desilicication and dephosphorization
  • Technology for KR liquid iron pretreatment desilicication and dephosphorization
  • Technology for KR liquid iron pretreatment desilicication and dephosphorization

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Embodiment

[0055] Example: Drain the molten iron to be desiliconized and dephosphorized into the molten iron ladle. After the molten iron is in place, remove the scum floating on the surface of the molten iron to avoid it, and then measure the temperature at 1311°C. The weight after removing the slag is 153 tons. The net weight is 109t; then artificially add about 700kg of iron oxide scale, then stir with the paddle, the speed gradually increases to 90 rpm, and the insertion depth is 1150mm; the stirring time is 8min; then the slag is removed to measure the temperature at 1288°C, and the sample is taken; then add 900kg of iron oxide scale, 50kg Fluorite, stir with the paddle for 8 minutes, and add 1.2 tons of lime at the same time; after the stirring is completed, the slag is removed and the temperature is measured at 1288°C, the sample is taken, and it is discharged from the station. After the sampling test, the contents of various substances in the molten iron are as Figure 5 shown by ...

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Abstract

The invention is suitable for the technical field of steel and iron smelting and provides a technology for KR liquid iron pretreatment desilicication and dephosphorization. A desilicication agent formed by mixing 90% of oxidized scale and 10% of white ash is added into liquid steel, the matter of FeO and Fe2O3 contained in the oxidized scale and white ash are used for generating a chemical reaction with Si in liquid iron under the high-temperature condition of 1150 DEG C to 1400 DEG C, SiO2 is generated to enter slag, Fe is generated to enter the liquid iron, and the purpose of reducing the silicon content of the liquid iron is achieved; and meanwhile, after the silicon in the liquid iron is lower than 0.2%, a dephosphorization agent formed by mixing 55% of oxidized scale, 35% of white ashand 10% of fluorite powder is added into the liquid iron, phosphorus in the liquid iron can generate a chemical reaction with FeO and CaO contained in the dephosphorization agent, phosphorus is oxidized and forms a stable compound (4CaO.P2O2) with CaO to enter the slag, normal smelting production of a converter is achieved, production of certain low-phosphorus steel balls is achieved, consumptionof steel and iron materials is reduced, and considerable economic benefits are created.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a KR molten iron pretreatment process for desiliconization and dephosphorization. Background technique [0002] KR hot metal pretreatment system is a hot metal desulfurization system commonly used in steel plants of modern iron and steel metallurgical enterprises. The main metallurgical functions include feeding, stirring and slag removal. [0003] At present, there are still many small blast furnaces below 1000m3 in our country, and the composition of molten iron often fluctuates, mainly due to the fluctuation of silicon content, which affects the normal smelting operation of the converter. The suitable silicon content of molten iron for converter smelting is between 0.2-0.4%. When the silicon content exceeds 0.6%, the converter smelting operation will be deteriorated, and converter splashing will often occur, causing production and safety accidents,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/02C21C1/04
CPCC21C1/02C21C1/025C21C1/04
Inventor 郭平刘树涛李洪波
Owner 山西建龙实业有限公司
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