CN102320852A - Furnace-protecting anhydrous stemming - Google Patents

Abstract

The invention provides furnace-protecting anhydrous stemming which comprises the following raw material chemical components by weight: 15-25% of corundum powder; 15-20% of coke powder; 15-20% of clay powder; 9-14% of silicon carbide powder; 2-4% of asphalt powder; 15-25% of anthracene oil; and 9-11% of titanium dioxide powder. The stemming of the invention has the characteristics of high strength, low shrinkage, and good caking property, has stable high temperature resistance, can be sintered rapidly, can prolong tapping time and ensure tapping smoothness, provides an iron notch drilling-trhough rate of above 95%, avoids the iron-leaking phenomenon and accidents of iron notch fracture and channel enlargement due to a shallow iron notch, increases the smelting intensity, reduces production cost, and ensures the safe running of blast furnace production. Especially, a titanium sediment wear-resistant protection layer with a small thermal conductivity coefficient and good corrosion resistance is formed, which has the effect of protecting the hearth and the furnace wall near the iron notch, and thus prolongs the service life of the blast furnace hearth and the furnace wall.

Description

But a kind of furnace retaining anhydrous stemming

Technical field

The invention belongs to fire resisting material field, relate in particular to a kind of anhydrous stemming that is used for the shutoff blast furnace taphole with the effect of protection cupola well.

Background technology

Stemming is used refractory materials as a kind of blast furnace iron notch shutoff, the quality of its quality not only directly influence ironmaking produce smoothly whether, and even and to having crucial effects in work-ing life of the safety blast furnace of the person and equipment.Therefore, require iron port gun mud should possess good plasticity-and adhesive property, be beneficial to get into and fill full iron mouth passage; Suitable void content and volumetric shrinkage are arranged again, be convenient to gas and discharge, avoid cracking; And should have intensity and refractoriness height, anti-washing away and basic physical and chemical properties such as corrosion-resistant property is good.For this reason; Ironmaking manufacturer both domestic and external and correlative study part have all been carried out big quantity research and experiment to the compositing formula and the use properties thereof of stemming; And significant progress and development have been obtained; Make stemming especially the quality of anhydrous stemming obtained large increase, adapted to the needs of blast furnace taphole shutoff and production basically.

Yet, up to now, the research of stemming only is limited to stemming in the performance aspect the shutoff of iron mouth, and does not see as yet that for the research of other effects of stemming relevant instance and report are arranged.In fact, after blast furnace taphole blocks up upward with stemming, have enough degree of depth for guaranteeing the iron mouth; Not only in the passage that taps a blast furnace, be full of stemming; And in the cupola well of blast furnace, also can form bigger mud drum, under the effect of high temperature liquid iron, these mud drums will be melted and get in the molten iron.Every day, blast furnace taphole all wanted repeated multiple times to be opened and filling, and the fusion stemming amount that gets in the cupola well also can constantly increase, thereby also will produce greatly life-span of cupola well and influence.

Along with the progress of ironmaking technology, the blast furnace heat size also constantly trends towards maximizing, so the hard nut to crack paid close attention to the most of the long-lived problem of the blast furnace person that become the blast furnace operating.In general; Generation furnace life blast furnace campaign has only 15 years usually; In near how prolonging the work-ing life of blast furnace, particularly blast furnace taphole the cupola well life-span, reduce the erosion of molten iron to the cupola well refractory materials; Protection cupola well cooling stave avoids the generation that the cupola well cooling stave burns accident also to become the important topic that needs to be resolved hurrily.

Summary of the invention

The present invention aims to provide a kind of have good physical and chemical property, especially can effectively reduce the erosion of molten iron to the cupola well refractory materials, avoids the cupola well cooling stave to burn accident, but improves the cupola well furnace retaining anhydrous stemming in work-ing life.

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

But a kind of furnace retaining anhydrous stemming is characterized in that, its material chemical component and weight percent content are:

Lapis amiridis 15-25%; Coke powder 15-20%; Clay powder 15-20%; Carborundum powder 9-14%; Asphalt powder 2-4%; Carbolineum 15-25%; Titania powder 9-11%;

Al in the said lapis amiridis ₂O ₃>=94%;

SiC in the said carborundum powder >=94.5%;

TiO in the said titania powder ₂>=96.5%.

Said each solid material maximum particle diameter is≤3mm.

Beneficial effect of the present invention is:

But the present invention's furnace retaining anhydrous stemming uses checking through reality, have intensity height, shrinking percentage is low, cohesiveness is good characteristics, and resistance to elevated temperatures is stable; But Fast Sintering, and can prolong and tap a blast furnace the time, it is smooth and easy to guarantee to tap a blast furnace; The taphole drilling passband reaches more than 95%, has avoided oozing accidents such as the fracture of iron phenomenon and iron mouth, the big stream of race, has improved combustion intensity; Reduce production cost, guaranteed the safe direct motion that blast furnace is produced.

Particularly owing to added the titania powder of proper ratio, TiO in the raw material of the present invention ₂Be reduced to Ti after going into the stove fusion, get into and to generate fusing point behind the molten iron and reach TiC more than 3000 ℃, TiN disperse in slag liquid.Molten iron temperature appearance temperature and N dividing potential drop along with condition changes, thereby makes the TiC of reduction of dissolved in molten iron, TiN decline and precipitating is come out.Because the cupola well been provided with internal refractories is etched the back and forms pit; The pit cooling intensity is big and temperature is low, and it is mild that molten iron flows, therefore will be residual with Ti (C; N) be the long-pending thing of main HMP, erosion resistant titanium; And progressively form the long-pending thing wear-resistant protective layer of titanium that thermal conductivity is little, corrosion resisting property is good, play near the effect of the furnace wall of protection cupola well and iron mouth, thereby prolong the work-ing life of blast furnace hearth and furnace wall.

Embodiment

Embodiment 1:

But furnace retaining anhydrous stemming material chemical component and weight percent content are:

Lapis amiridis 25%; Coke powder 16%; Clay powder 19%; Carborundum powder 9%; Asphalt powder 3%; Carbolineum 18%; Titania powder 10%.

Wherein: Al in the lapis amiridis ₂O ₃Be 94.5%; SiC is 95% in the carborundum powder; TiO in the titania powder ₂96.5%.Each solid material particle diameter is 325 orders, and maximum particle diameter is no more than 2.8mm.

Embodiment 2:

But furnace retaining anhydrous stemming material chemical component and weight percent content are:

Lapis amiridis 20%; Coke powder 17%; Clay powder 16%; Carborundum powder 12%; Asphalt powder 4%; Carbolineum 20%; Titania powder 11%.

Wherein: Al in the lapis amiridis ₂O ₃Be 94%; SiC is 95% in the carborundum powder; TiO in the titania powder ₂97%.Each solid material particle diameter is 325 orders, and maximum particle diameter is no more than 1.5mm.

Embodiment 3:

But furnace retaining anhydrous stemming material chemical component and weight percent content are:

Lapis amiridis 15%; Coke powder 18%; Clay powder 20%; Carborundum powder 13%; Asphalt powder 2%; Carbolineum 23%; Titania powder 9%.

Wherein: Al in the lapis amiridis ₂O ₃Be 95%; SiC is 94.5% in the carborundum powder; TiO in the titania powder ₂96.5%.Each solid material particle diameter is 325 orders, and maximum particle diameter is no more than 2.0mm.

Claims (2)

1. but a furnace retaining anhydrous stemming is characterized in that, its material chemical component and weight percent content are:

Lapis amiridis 15-25%; Coke powder 15-20%; Clay powder 15-20%; Carborundum powder 9-14%; Asphalt powder 2-4%; Carbolineum 15-25%; Titania powder 9-11%;

Al in the said lapis amiridis ₂O ₃>=94%;

SiC in the said carborundum powder >=94.5%;

TiO in the said titania powder ₂>=96.5%.

2. but furnace retaining anhydrous stemming according to claim 1 is characterized in that, said each solid material maximum particle diameter is≤3mm.