Molten iron dephosphorization device and dephosphorization method for smelting stainless steel

A stainless steel and molten iron technology, applied in the field of iron and steel metallurgy, can solve the problems of large space occupied by oxygen lances and spray guns, affecting the use effect of powder, and large loss of powder, saving space, shortening dephosphorization treatment time, and reducing smelting costs. Effect
CN110396572AActive Publication Date: 2019-11-01CENT IRON & STEEL RES INST
4 Cites 2 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CENT IRON & STEEL RES INST
Publication Date
2019-11-01

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to a molten iron dephosphorization device and dephosphorization method for smelting stainless steel, belongs to the technical field of ferrous metallurgy, and solves the problemsthat an existing dephosphorization device is large in occupied space, large in powder loss and low in smelting efficiency. The molten iron dephosphorization device comprises a storage tank, a conveying tank, a blowing tank, a spray gun, a ventilation pipe and a steel ladle, wherein the storage tank is connected with the blowing tank through the conveying tank, and the blowing tank and the ventilation pipe are connected with the spray gun; the spray gun comprises a first pipe and a second pipe, the first pipe is provided with a supporting bearing or the first pipe consists of flexible connecting pipes, and the first pipe is telescopically arranged in the second pipe; and the second pipe is provided with N spray gun outlets. The dephosphorization method comprises the following steps that desiliconization treatment is carried out on molten iron, desiliconized slag is removed, the molten iron is sprayed with oxygen and slagging materials, and molten slag is formed on the surface of the molten iron; and the steel ladle is sprayed with oxygen and slagging materials for dephosphorization treatment, wherein the oxygen spraying flow is 0.9 Nm<3> / t.min-1.2 Nm<3> / t.min, and the oxygen supply pressure is not less than 0.6 Mpa, so that the self-rotation of the spray gun is guaranteed. The device and the method can be used for molten iron dephosphorization for smelting the stainless steel.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a molten iron dephosphorization device and a dephosphorization method for smelting stainless steel. Background technique

[0002] In order to meet the requirements of phosphorus content in the production of stainless steel, the devices currently used in the dephosphorization process of molten iron powder spraying and oxygen spraying in ladles are three-hole oxygen lances and powder spraying lances. This method can dephosphorize molten iron very well, and the dephosphorization rate of molten iron is above 80%. The lance is blown to the surface of the molten iron, and the lime is added by inert gas injection, which can strengthen the agitation of the molten iron and promote the dephosphorization reaction; The sprayed powder has a large loss, which affects the use effect of the powder; second, the smelting time is long, generally about 40-50min. Contents of the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More