CN210736584U

CN210736584U - Magnesia carbon brick

Info

Publication number: CN210736584U
Application number: CN201921474347.4U
Authority: CN
Inventors: 申德彪; 蔡吴胜; 张松灿; 陈艳萍; 孙定云; 寇联邦
Original assignee: Shanghai Supezet Engineering Technology Co ltd; Supezet Jingjiang Equipment Manufacturing Co ltd
Current assignee: Shanghai Supezet Engineering Technology Co ltd; Supezet Jingjiang Equipment Manufacturing Co ltd
Priority date: 2019-09-06
Filing date: 2019-09-06
Publication date: 2020-06-12
Anticipated expiration: 2029-09-06

Abstract

The utility model discloses a magnesia carbon brick. The magnesia carbon brick is used for building a furnace lining of an intermediate frequency furnace, the magnesia carbon brick is respectively provided with a convex block and a groove which are matched with each other on a mounting plane, the included angle of the two mounting planes is 15 degrees, the outer arc of the magnesia carbon brick is consistent with the outer circle of the furnace lining body in size, the inner arc is consistent with the inner circle of the furnace lining body in size, and the upper surface and the lower surface of the magnesia carbon brick, which are contacted with the furnace lining, are uniformly distributed with convex points. The intermediate frequency furnace lining built by the magnesia carbon bricks can realize the steelmaking and refining of the intermediate frequency furnace, and provides smelting conditions for producing high-quality castings in the casting industry.

Description

Magnesia carbon brick

Technical Field

The utility model discloses be applied to the intermediate frequency furnace and smelt the field, concretely relates to a magnesia carbon brick for intermediate frequency furnace molten steel is concise.

Background

The cupola furnace is gradually eliminated along with the environmental protection requirement in the casting industry, and the intermediate frequency furnace is mostly adopted for the cast steel smelting. Due to the restriction of the furnace lining of the intermediate frequency furnace, refining cannot be carried out, and the production of high-quality steel castings cannot be carried out.

The furnace lining of the intermediate frequency furnace is generally divided into an acid furnace lining, a neutral furnace lining and an alkaline furnace lining. The acidic furnace lining takes silicon oxide as a main component, the neutral furnace lining takes aluminum oxide as a main component, and the alkaline furnace lining takes magnesium oxide as a main component. Because the melting point of the acid furnace lining is low and the thermal shock property of the basic furnace lining is poor, the neutral furnace lining or the magnesium aluminate spinel basic furnace lining is mostly adopted for the smelting of cast steel. However, the neutral alumina furnace lining can not be slagging refined, and a magnesia-alumina spinel basic furnace lining is required to be adopted, even if the service life of the furnace lining is very low, under the general condition, the furnace lining is seriously corroded at the slagging line position and can only be used for about one week, and the furnace lining is replaced by striking and baking the furnace again.

Disclosure of Invention

The utility model provides a technical problem be: the magnesia carbon brick can be used for building a furnace lining of an intermediate frequency furnace, and the furnace lining can meet the requirements of slagging and refining.

The utility model adopts the technical proposal that: the mounting plane of the magnesia carbon brick is provided with two mutually matched lugs or grooves, and the included angle between the two mounting planes of the magnesia carbon brick is 15 degrees; the difference value of the radiuses of the two arc surfaces of the magnesia carbon brick is the thickness of the furnace lining, the outer arc of the magnesia carbon brick is consistent with the outer circle of the furnace lining, and the inner arc of the magnesia carbon brick is consistent with the inner circle of the furnace lining; the upper and lower surfaces of the magnesia carbon brick, which are contacted with the furnace lining, are uniformly distributed with convex tips. The height of the magnesia carbon brick is larger than the thickness of the refining slag layer.

The utility model has the advantages that: the intermediate frequency furnace lining built by the magnesia carbon bricks can realize the steelmaking and the refining of the intermediate frequency furnace, changes the traditional thinking that the intermediate frequency furnace can only melt and can not make steel, and provides smelting conditions for producing high-quality castings in the casting industry.

Drawings

FIG. 1 is a top view of a first construction of an MgO-C brick;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a plan view of the magnesia carbon brick furnace lining of FIG. 1;

FIG. 4 shows a second structural form of the magnesia carbon brick;

FIG. 5 shows a third structural form of the magnesia carbon brick;

FIG. 6 shows a fourth structural form of the magnesia carbon brick;

wherein: 1-convex block, 2-concave groove and 3-convex tip.

Detailed Description

The accompanying drawings 1 and 2 are respectively a top view and a front view of a magnesia carbon brick with a first structural form, wherein a mounting plane of the magnesia carbon brick is respectively provided with a lug 1 and a groove 2 which are matched with each other, preferably two lugs 1 or two grooves 2 are arranged on the mounting plane, and a schematic plan view of a furnace lining formed by matching and mounting the lugs 1 and the grooves 2 is shown in the accompanying drawing 3, and the lug 1 and the groove 2 are matched with each other to play a role in positioning and increasing sealing, so that molten steel is prevented from penetrating through a slag line layer to cause steel leakage. The included angle of the two mounting planes is 15 degrees, and the included angle of 15 degrees ensures that the magnesia carbon bricks can be combined into a closed perfect circle. The difference value of the radiuses of the two arcs of the magnesia carbon brick is the thickness of the furnace lining, the outer arc is consistent with the outer circle of the furnace lining body 1, and the inner arc is consistent with the inner circle of the furnace lining body 1. The convex tips 3 are uniformly distributed on the plane contacted with the upper and lower furnace lining bodies, and the convex tips 3 can increase the binding force with the upper and lower furnace lining bodies.

Fig. 4, fig. 5 and fig. 6 are respectively different structural forms of the magnesia carbon brick, and the differences from fig. 1 are in the shapes, positions and numbers of the convex blocks 1 and the concave grooves 2. As in fig. 1, the projection 1 and the recess 2 are fitted to each other in use.

The intermediate frequency furnace lining built by the utility model can be used for smelting molten steel, can carry out oxidative dephosphorization, makes deoxidation and desulfurization of reducing slag, alloying and the like, and can also blow in inert gas from the furnace bottom for refining. Because the magnesia carbon brick cannot tolerate the oxidizing slag, the oxidizing dephosphorization of the molten steel is preferably carried out in a steel ladle, after slagging off, the dephosphorized molten steel is poured into an intermediate frequency furnace to produce reducing slag, and alloying and bottom blowing argon refining are carried out. The specific smelting steps comprise: 1) melting metal raw materials, tapping molten steel into a steel ladle, adding slagging auxiliary materials such as lime and the like, and blowing oxygen to remove phosphorus through a steel pipe; 2) removing oxidation slag in a ladle, pouring deoxidized molten steel into an intermediate frequency furnace, adding slagging auxiliary materials such as lime and the like into the molten steel to melt when the liquid level of the molten steel is not lower than the lowest line of the magnesia carbon brick on a slag line layer, and adding a deoxidizer to produce reducing slag, wherein the thickness of the reducing slag is not less than 50mm, and the thickness of a slag layer is within the height range of the magnesia carbon brick; 3) alloying the sample in the reducing slag state, adding the alloy, then blowing argon from the bottom to purify the molten steel, and heating to prepare for tapping, wherein the stirred molten steel does not expose the reducing slag layer; 4) and mixing the steel slag during tapping, removing the reducing slag in the steel ladle, adding the covering slag, melting and hoisting to a casting station.

The furnace lining built by the magnesia-carbon bricks and the steel ladle together realize the steelmaking of the intermediate frequency furnace, the smelting process comprises the processes of dephosphorization in an oxidation period, deoxidation and desulfurization in a reduction period, argon refining before tapping and the like, the traditional thinking that the intermediate frequency furnace can only melt and can not make steel is changed, and smelting conditions are provided for producing high-quality castings in the casting industry.

Claims

1. A magnesia carbon brick is characterized in that: a convex block (1) and a groove (2) which are matched with each other are designed on the mounting plane, and the included angle of the two mounting planes is 15 degrees; the outer arc of the magnesia carbon brick is consistent with the outer circle of the furnace lining, and the inner arc of the magnesia carbon brick is consistent with the inner circle of the furnace lining; the upper and lower surfaces of the magnesia carbon brick, which are contacted with the furnace lining, are uniformly distributed with convex tips (6).

2. The magnesia carbon brick of claim 1, wherein: the number of the convex blocks (1) or the concave grooves (2) on the mounting plane is two.