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Sulfur and phosphorus deep removal method of slagless steelmaking

A deep, removal technology, applied in the field of steel slag dephosphorization and desulfurization, can solve problems such as iron loss, and achieve the effects of reducing iron loss in slag phase, reducing flue gas volume, and improving preparation efficiency

Active Publication Date: 2020-07-31
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned analysis, the embodiment of the present invention aims to provide a method for deep removal of sulfur and phosphorus in steelmaking with less slag, to solve the problem that a large amount of steel slag is generated during the existing molten iron steelmaking and that a large amount of alkaline flux is added during steel slag processing and the iron technical problems with substantial losses

Method used

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  • Sulfur and phosphorus deep removal method of slagless steelmaking
  • Sulfur and phosphorus deep removal method of slagless steelmaking
  • Sulfur and phosphorus deep removal method of slagless steelmaking

Examples

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Effect test

Embodiment 1

[0061] Using pure iron, ferrosilicon and graphite powder as raw materials, they are completely melted in an intermediate frequency induction furnace to prepare molten iron with a silicon content of 0.15% and a carbon content of 3.5%, which is used for desiliconization and decarburization at a temperature of 1650°C. The mass of molten iron per furnace is 20kg.

[0062] After the molten iron is completely melted, the flux quicklime (pure chemical reagent) is added as a desiliconization agent, and O is sprayed to the bottom of the molten iron through a corundum tube. 2 , O 2 The gas flow rate is 20L / min, and the oxygen blowing is stopped after the injection time reaches 35 minutes. After standing still for 10 minutes, a small amount of molten steel and molten slag are extracted respectively through the sampler, which are broken into small steel particles and slag particles after cooling, and the steel particles are determined by chemical analysis. Particle silicon content and sl...

Embodiment 2

[0068] Using pure iron and FeS pure chemical reagents as raw materials, they are completely melted in an intermediate frequency induction furnace to prepare molten steel with a S content of 0.05% for desulfurization experiments. The experimental temperature is 1650 ° C, and the mass of molten steel per furnace is 20kg.

[0069] Add zinc particles to the molten steel through the corundum tube, the addition amount is 0.05-0.2% of the mass of the molten steel, and the addition amount is 0.05% each time. The corundum tube is inserted into the bottom of the molten steel to prevent zinc from quickly escaping from the molten steel after vaporization, and increase the relationship between zinc and molten steel. Reaction time. Wait for 10 minutes after each addition of zinc particles. After the composition of molten steel is completely uniform, a small amount of molten steel is extracted through a sampler. After cooling, it is broken into small steel particles, and the sulfur content of...

Embodiment 3

[0072] Using pure iron and iron phosphide pure chemical reagents as raw materials, they are completely melted in an intermediate frequency induction furnace to prepare molten steel with a P content of 0.15% for dephosphorization experiments. The experimental temperature is 1650 ° C, and the mass of molten steel per furnace is 20kg.

[0073] Add ZnO powder reagent to the molten steel through a corundum tube and stir to disperse the ZnO in the molten steel. The amount of ZnO added is 0.5-0.8% of the mass of the molten steel. The first addition is 5%, and then 1% each time. After each addition of ZnO, CO was injected to the bottom of the molten steel through a corundum tube 2 gas, CO 2 The gas flow rate is 2L / min, the injection time is 30min after the first addition of ZnO, and the injection time is 6min after each addition of ZnO. Stand still for 10 minutes after each injection to ensure that the formed FeO fully reacts with ZnO and P to form zinc phosphate. A small amount of ...

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Abstract

The invention relates to a sulfur and phosphorus deep removal method of slagless steelmaking, and belongs to the technical field of steelmaking. With the sulfur and phosphorus deep removal method of slagless steelmaking, the problem that in the prior art, much steel slag is generated, and the steel slag is difficult to utilize is solved. The sulfur and phosphorus deep removal method of slagless steelmaking comprises the steps that first, alkaline flux is added into molten steel to carry out desilicication and decarburization, and steel slag and molten steel which are low in alkalinity and ironcontent are obtained; second, a desulfurizer Zn is used to desulfurize the molten steel to obtain desulfurized molten steel; third, deep decarburization is carried out on the desulfurized molten steel, and when the carbon content in the molten steel is lower than 0.5%, and the molten steel is dephosphorized by utilizing CO2 gas containing ZnO powder to obtain zinc phosphate flux and dephosphorized molten steel; and fourth, the zinc phosphate flux is reduced by utilizing solid carbon to obtain phosphorus and metal zinc, phosphorus is recycled, and the metal zinc returns to the second step as the desulfurizer. With the sulfur and phosphorus deep removal method of slagless steelmaking, much less steel slag is generated, the content of free CaO and the content of iron in the steel slag are reduced, the use ratio of the steel slag is increased, and the problem about stacking storage of the steel slag is solved completely.

Description

technical field [0001] The invention relates to the technical field of steel slag dephosphorization and desulfurization, in particular to a method for deep removal of sulfur and phosphorus in steelmaking with less slag. Background technique [0002] Converter slag needs high alkalinity to meet the dephosphorization and desulfurization requirements. The steelmaking process needs to add a large amount of alkaline flux to form slag. At the same time, the dephosphorization process is carried out in an oxidizing atmosphere. To ensure the dephosphorization efficiency, it is necessary to ensure that the slag phase It has a certain content of iron oxide. Therefore, the slagging process not only needs to consume a large amount of alkaline flux, but also causes a large loss of iron. In addition, when the dephosphorization and desulfurization processes of the converter are carried out under the same slag conditions, the strong oxidative atmosphere is not conducive to the removal of sul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C7/068C01B25/02
CPCC01B25/02C21C7/064C21C7/068C21C2200/00Y02P10/20
Inventor 张俊周和敏王锋高建军
Owner CENT IRON & STEEL RES INST
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