CN102816888A

CN102816888A - Method for preventing sintering of steel outlet during fettling

Info

Publication number: CN102816888A
Application number: CN201210361379XA
Authority: CN
Inventors: 舒耀; 李伟东; 袁皓; 杨辉; 王成青; 赵晨光
Original assignee: Angang Steel Co Ltd
Current assignee: Angang Steel Co Ltd
Priority date: 2012-09-25
Filing date: 2012-09-25
Publication date: 2012-12-12

Abstract

The invention provides a method for preventing sintering of a steel outlet during fettling. The method comprises the following steps of: shaking a rotary furnace to mius 30 degrees; inserting a protecting pipe of which the diameter is smaller than the inside diameter of the steel outlet, the length is greater than that of the steel outlet sleeve and one end is provided with a clay filling brick into the steel outlet; fixing the protecting pipe to the steel outlet by the clay filling brick; shaking the rotary furnace to 60 degrees; turning a fettling material into the rotary furnace in a groove turning mode; shaking the rotary furnace to a fettling position for sintering; directly performing operations of iron mixing, addition of waste steel and smelting after the fettling is finished; and automatically dropping off the clay filling brick at the steel outlet under a steel water gravity function. By the method, an inner port of the steel outlet is repaired, and an operation step of adding the clay filling brick of the steel outlet before a blowing step is eliminated, so that the sintering of the steel outlet during the fettling is effectively prevented, the fettling time is obviously shortened, the working ratio and the yield of the rotary furnace are improved, the service life of the steel outlet is prolonged, the consumption cost and the production cost of spare parts are reduced.

Description

A kind of tap hole agglomerating method when preventing fettling

Technical field

The invention belongs to the converter lining patching technical field, relate in particular to a kind of tap hole agglomerating method can prevent the converter fettling time.

Background technology

Converter lining will reach longevityization, and topmost method is to adopt fettling technology.Wherein the most frequently used is that groove turns over the fettling pattern; Be about to converter body and shake about 60 ° of stokeholds (being positive-angle); Mending material ploughs under in the stove through trough; Again (negative angle) certain angle behind stokehold or the stove being shaken in converter, generally is to shake to the stokehold behind 110 °, stove about-110 °, and mending material can be laid on big of the furnace lining equably.And then converter is shaken 90 ° perhaps-90 ° carry out sintering, thereby two big faces of converter are repaired.

During fettling, when grate behind stove, the as easy as rolling off a log entering tap hole of mending material; Behind the sintering through the fettling process, can stop up tap hole, before stove is converted iron down, need burn oxygen treatments applied tap hole; It is different to look the sintering degree, and the burning oxygen time is also inequality, not only wastes time and energy; Waste energy, and take the PT, directly have influence on the operating rate of converter.

Summary of the invention

The object of the invention aims to provide a kind of tap hole agglomerating method when preventing fettling, thereby avoids tap hole is burnt oxygen treatments applied, shortens the filling time, and stably manufactured rhythm improves tap hole work-ing life and converter operating rate.

For this reason, the solution that the present invention taked is:

A kind of tap hole agglomerating method when preventing fettling, its concrete steps are:

1, makes a diameter less than tap hole internal diameter, length steel pillar greater than tap hole casing length 50-100mm; The microcephaly of again that the Converter Oxigen Blowing process is used truncated cone tap hole clay plug brick fills in pillar one end, and clay plug brick enlarged head branch is retained in outside the pillar;

2, before the fettling, earlier converter is shaken to-28 °～-30 °, pillar is inserted tap hole, an end that wherein has the clay plug brick is positioned at the converter outside, through the clay plug brick pillar is fixed on the tap hole;

3, converter is shaken to 58 °～63 °, adopt the groove mode of turning over that mending material is translated in the converter, mending material evenly is laid on the big face of furnace lining through grate then, at last the fettling position is shaken in converter and carry out sintering;

4, fettling is directly converted iron after finishing, is added steel scrap and smelting operation, smelts when finishing to put down the stove tapping, and tap hole clay plug brick comes off under the molten steel action of gravity voluntarily, and the steel pillar melts in tapping process.

Beneficial effect of the present invention is:

Because pillar of the present invention is longer than the tap hole sleeve pipe, therefore when tap hole one side grate, mending material can not get into tap hole, can only accumulate in the tap hole around the pillar mouthful, and mouth plays repair in can be to tap hole behind the oversintering.And, can not produce sintering with tap hole because the clay plug brick has the pillar protection yet, and when putting down the stove tapping, can under the molten steel action of gravity, come off voluntarily, neither influence tapping steel, but also can save the operation steps that adds tap hole clay plug brick before the blowing.Therefore, tap hole sintering when the present invention can effectively prevent fettling is save and is burnt the oxygen treatment process, significantly shortens the filling time, improves the operating rate and the output of converter.Simultaneously, can repair, help prolonging the work-ing life of tap hole, reduce spare parts consumption and production cost mouth in the tap hole.

Description of drawings

Accompanying drawing is the pillar synoptic diagram that has the clay plug brick.

Among the figure: clay plug brick 1, pillar 2.

Embodiment

The concrete steps of tap hole sintering method were when the present invention prevented fettling:

1, making a diameter is 3mm, the length steel pillar 2 greater than tap hole casing length 80mm less than tap hole internal diameter, wall thickness; The microcephaly of again that the Converter Oxigen Blowing process is used truncated cone tap hole clay plug brick 1 fills in pillar 2 terminations, and the enlarged head branch of clay plug brick 1 is retained in outside the pillar 2.

2, before the fettling, earlier converter is shaken to-30 °, pillar 2 is inserted tap hole, an end that wherein has clay plug brick 1 is positioned at the converter outside, through clay plug brick 1 pillar 2 is fixed on the tap hole.

3, converter is shaken to 60 °, adopt the groove mode of turning over that mending material is translated in the converter, mending material evenly is laid on the big face of furnace lining through grate then, at last the fettling position is shaken in converter and carry out sintering.

4, fettling is directly converted iron after finishing, is added steel scrap and smelting operation.After pillar 2 melted in tapping process, tap hole clay plug brick 1 can come off under the molten steel action of gravity voluntarily, therefore not can with mouthful sintering in the tap hole, neither influence tapping steel, can save the operation steps that blowing forward direction tap hole adds clay plug brick 1 again.

Claims

1. the agglomerating of tap hole when preventing fettling method is characterized in that concrete steps are:

(1), makes a diameter less than tap hole internal diameter, length steel pillar greater than tap hole casing length 50-100mm; The microcephaly of again that the Converter Oxigen Blowing process is used truncated cone tap hole clay plug brick fills in pillar one end, and clay plug brick enlarged head branch is retained in outside the pillar;

(2), before the fettling, earlier converter is shaken to-28 °～-32 °, pillar is inserted tap hole, an end that wherein has the clay plug brick is positioned at the converter outside, through the clay plug brick pillar is fixed on the tap hole;

(3), converter is shaken to 58 °～63 °, adopt the groove mode of turning over that mending material is translated in the converter, mending material evenly is laid on the big face of furnace lining through grate then, at last the fettling position is shaken in converter and carry out sintering;

(4), fettling directly converts iron after finishing, adds steel scrap and smelting operation, smelts when finishing to put down the stove tapping, tap hole clay plug brick comes off under the molten steel action of gravity voluntarily, and the steel pillar melts in tapping process.