CN103787680A - Alkaline stemming - Google Patents

Abstract

The invention relates to alkaline stemming which is prepared from the following raw materials: 25%-50% of sintered magnesia, 5%-20% of dust coke, 10%-25% of magnesium-carbon reclaimed material, 1%-10% of carbon-containing resin powder, 5%-10% of silicon carbide, 5%-10% of Jiaozuo clay, 1%-5% of alpha aluminum oxide, 5%-20% of light burning magnesium powder, 5%-10% of andalusite, and stemming-dedicated resin accounting for 10%-20% of the total weight of the raw materials. The alkaline stemming provided by the invention has the advantages of good plasticity and adhesion, appropriate porosity, slight volume expansion at high temperature, good sintering property, high strength, scouring resistance, erosion resistance, easiness in tapping and environmental friendliness, and does not discharge pollutant gas in the sintering process; the molten iron scouring resistance of the alkaline material is fully played, and the alkaline stemming does not bring pollution or harmful impurities to molten iron; the harmful impurities in the molten iron can be reduced to purify the molten iron; the harmful components such as phosphorus, sulfur and silicon in the molten iron are reduced; the alkaline stemming provided by the invention has the advantages of long service life, short sintering time, high strength and easiness in tapping, reduces the maintenance cost of an iron notch and is conducive to the stable operation and stable and high yield of a blast furnace.

Description

Alkalescence stemming

Technical field

The present invention relates to metallurgical fire resisting material field, be specifically related to the alkaline stemming of a kind of blast furnace iron notch.

Background technology

In recent years, co-content blast furnace is not holded up like the mushrooms after rain, falls over each other to adopt the new technologies such as high blast, high top pressure, Gao Yeqiang, Wind Volume, the large winding-up of oxygen enrichment.Along with the raising of blast-furnace equipment and smelting technology, the utilization coefficient of blast furnace is improved, and the number of casts increases, and the time of tapping a blast furnace increases, and the amount of tapping a blast furnace increases, and this quality to tamping plug for blast furnace spout proposes higher requirement.The function of stemming should be filled up iron notch passage, forms again mud drum in cupola well, maintains enough iron notch degree of depth; Also want easy opening simultaneously, also easily play mud operation, the physics and chemistry that slag, iron are produced corrodes and has resistivity.Stemming is of poor quality, just there will be wattenshlick, shallow, the disconnected iron mouth of iron mouth, runs and flow greatly, burn out the problems such as casthouse equipment when use, has a strong impact on production.Iron notch stemming should possess: the plasticity-of (1) appropriateness, facilitates flushing and casting; (2) void content is suitable, is convenient to discharge when dry moisture and gas; (3) volume stability is good, to avoid cracking seepage molten iron and coal gas; (4) sintering character is good, and intensity is high, and refractoriness is high, can anti-molten iron and the washing away and corrode of slag; (5) opening is functional.The multiplex bauxitic clay of traditional stemming does raw material, along with the increase of raw materials cost, the stokehold requirement that very difficult adaptation is more and more harsher, people also more pay attention to the environmental issue in production process simultaneously, and the stemming of majority uses meeting to produce some hazardous and noxious substances under hot conditions at present, environment is had a negative impact.

Summary of the invention

The technical problem to be solved in the present invention be to provide a kind of retrospective good, beat that mud is suitable, the life-span is long, the alkaline stemming of the iron of resistance to slag aggressiveness blast furnace iron notch good, that abrasion resistance is good.

For solving the problems of the technologies described above, the technical solution used in the present invention is:

Design the alkaline stemming of a kind of blast furnace iron notch, by weight percentage, made by following raw material:

Magnesite clinker 25～50%, burnt foam 5～20%, magnesium carbon reworked material 10～25%, carbon containing resin-oatmeal 1～10%, silicon carbide 5～10%, Jiaozhuo clay 5～10%, α-aluminum oxide 1～5%, light-burning magnesium powder 5～20%, andaluzite 5～10%, and resin dedicated by 10～20% additional stemmings of above raw material gross weight.

The granularity of described magnesite clinker is 0～5mm, MgO content >=90% wherein.

The granularity of described magnesium carbon reworked material is 150～250 orders, MgO content>=55% wherein, C content≤30%, SiO ₂content < 4%, CaO content < 2%.

The granularity of described carbon containing resin-oatmeal is 180～200 orders.

Described carbon containing resin-oatmeal can be selected CARBORES P, this raw material is novel, the efficient environmentally friendly refractory binder of one of German Rui Jia Chemical Group company exploitation, compared with tradition bubble mud medium pitch powder, toxic ingredient content very low (its benzo castor content is only 500ppm, and the benzo castor content of asphalt powder is up to 12000ppm) in CARBORES P.

The granularity of described silicon carbide is 150～250 orders, wherein SiC content >=90%.

Described Jiaozhuo clay Al ₂o ₃>=32%, Fe ₂o ₃< 1.5%, refractoriness is greater than 1700 ℃.Jiaozhuo clay has that plasticity-is good, good fluidity, feature that associativity is good.

The preparation method of described alkaline stemming is as follows:

Getting magnesite clinker, burnt foam, magnesium carbon reworked material, carbon containing resin-oatmeal, silicon carbide, Jiaozhuo clay, light-burning magnesium powder, α-aluminum oxide, andaluzite powder by described weight proportion inserts in edge runner-wet mill and is dry mixed 3～5 minutes, add again resin mixed grind 20～30 minutes, resin is fully moistened to be dipped in mixed powder, after thering is certain plasticity-, extrude by stemming extruder.

Described stemming is resin dedicated is CARBORES ^?t60 stemming is resin dedicated, is the CARBORES that professional chemical enterprise Rui Jia Chemical Group company of Germany researches and develops ^?the special binding agent for the manufacture of blast furnace mud in series product.

Described tamping plug for blast furnace spout preparation method is as follows:

Getting magnesite clinker, burnt foam, magnesium carbon reworked material, carbon containing resin-oatmeal, silicon carbide, Jiaozhuo clay, light-burning magnesium powder, α-aluminum oxide, andaluzite powder by described weight proportion inserts in edge runner-wet mill and is dry mixed 3～5 minutes, add again resin mixed grind 20～30 minutes, resin is fully moistened to be dipped in mixed powder, after thering is certain plasticity-, extrude by stemming extruder.

The present invention has actively useful effect:

1. the present invention alkalescence stemming retrospective and cementability are good, and void content is suitable, high volume microdilatancy, and sintering character is good, and intensity is high, resistance to erosion, resistance to erosion, easily opening, environmentally friendly, exhaust emission gas not in sintering process; Relevant performance index are referring to table 1.

2. the present invention's alkalescence stemming is mainly to adopt magnesia raw material to do aggregate, give full play to the anti-molten iron of basic material and washed away, and the advantage that the iron of resistance to slag corrodes, high temperature microdilatancy, alkaline stemming does not bring and pollutes and detrimental impurity molten iron simultaneously; Can reduce the detrimental impurity in molten iron, purifying molten iron; The objectionable constituent such as phosphorus in molten iron, sulphur, silicon are reduced.

3. the present invention's alkalescence stemming long service life, sintering time is short, intensity is high, easy perforate, reduces the maintenance cost of iron mouth, is conducive to blast furnace stable smooth operation, high and stable yields.Magnesium carbon reworked material is the use to waste and old resistance to material simultaneously, has both been conducive to protection of the environment, has saved again resource, has benefited the nation and the people.

The performance comparison of table 1 the present invention alkalescence stemming and traditional stemming

Embodiment

Further set forth the present invention below in conjunction with specific embodiment.Related each raw material in following embodiment, if no special instructions, is commercially available.

1 one kinds of alkaline stemmings of embodiment, by weight percentage, made by following raw material:

Magnesite clinker (granularity≤5mm, MgO content>=90%) 30%, burnt foam 15%, andaluzite (granularity≤1mm, Al ₂o ₃content>=55%) 5%, magnesium carbon reworked material 12%, carbon containing resin-oatmeal (CARBORES P, 200 orders) 3%, silicon carbide (200 order) 10%, Jiaozhuo clay (200 order) 5%, light-burning magnesium powder 10%, α-aluminum oxide 5%, andaluzite powder 5%, and by the resin dedicated (CARBORES of 15% additional stemming of above raw material gross weight ^?t60);

Getting magnesite clinker, andaluzite, magnesium carbon reworked material, carbon containing resin-oatmeal, silicon carbide, Jiaozhuo clay, light-burning magnesium powder, α-aluminum oxide and andaluzite powder by described weight proportion inserts in edge runner-wet mill and is dry mixed 4 minutes, add again resin mixed grind 25 minutes, resin is fully moistened to be dipped in mixed powder, after thering is certain plasticity-, extrude by stemming extruder.

Above-mentioned stemming is at the 2500m of Hebei Steel Plant ³the application practice of blast furnace shows: 1. beat mud suitable, opening time is about 10 minutes; 2. not reaming, resistance to erosion resistance to erosion; 3. the time of tapping a blast furnace is long, and 120 points of time averages tap a blast furnace; 4. smokeless, have no irritating odor, greatly improve stokehold environment.

2 one kinds of alkaline stemmings of embodiment, by weight percentage, made by following raw material:

Magnesite clinker (granularity≤5mm, MgO content>=90%) 35%, burnt foam 10%, andaluzite (granularity≤1mm, Al ₂o ₃content>=55%) 10%, magnesium carbon reworked material 15%, carbon containing resin-oatmeal (CARBORES P, 200 orders) 2%, silicon carbide (250 order) 8%, Jiaozhuo clay (250 order) 6%, light-burning magnesium powder 10%, α-aluminum oxide 4%, and by 17% additional resin (CARBORES of above raw material gross weight ^?t60);

The same ordinary method of preparation method of above-mentioned stemming.

3 one kinds of alkaline stemmings of embodiment, by weight percentage, made by following raw material:

Magnesite clinker (granularity≤5mm, MgO content>=90%) 25%, burnt foam 15%, andaluzite (granularity≤1mm, Al ₂o ₃content>=55%) 8%, magnesium carbon reworked material 24%, carbon containing resin-oatmeal (CARBORES P, 200 orders) 4%, silicon carbide (250 order) 5%, Jiaozhuo clay (250 order) 5%, light-burning magnesium powder 10%, α-aluminum oxide 4%, and by 18% additional resin (CARBORES of above raw material gross weight ^?t60).

Although above the present invention is described in detail with a general description of the specific embodiments, on basis of the present invention, can make some modifications or improvements it, this will be apparent to those skilled in the art.Therefore, these modifications or improvements without departing from theon the basis of the spirit of the present invention, all belong to the scope of protection of present invention.

Claims (8)

1. an alkaline stemming, by weight percentage, made by following raw material:

Magnesite clinker 25～50%, burnt foam 5～20%, magnesium carbon reworked material 10～25%, carbon containing resin-oatmeal 1～10%, silicon carbide 5～10%, Jiaozhuo clay 5～10%, α-aluminum oxide 1～5%, light-burning magnesium powder 5～20%, andaluzite 5～10%, 10～20% stemmings of additional above raw material gross weight are resin dedicated.

2. alkaline stemming according to claim 1, is characterized in that, the granularity of described magnesite clinker is 0～5mm, MgO content >=90% wherein.

3. alkaline stemming according to claim 1, is characterized in that, the granularity of described magnesium carbon reworked material is 150～250 orders, MgO content>=55% wherein, C content≤30%, SiO ₂content < 4%, CaO content < 2%.

4. alkaline stemming according to claim 1, is characterized in that, described carbon containing resin-oatmeal is CARBORES P, and its granularity is 180～200 orders.

5. alkaline stemming according to claim 4, is characterized in that, described stemming is resin dedicated is CARBORES ^?t60.

6. alkaline stemming according to claim 1, is characterized in that, the granularity of described silicon carbide is 150～250 orders, wherein SiC content >=90%.

7. alkaline stemming according to claim 1, is characterized in that, described Jiaozhuo clay Al ₂o ₃>=32%, Fe ₂o ₃< 1.5%, refractoriness is greater than 1700 ℃.

8. alkaline stemming according to claim 1, is characterized in that, the preparation method of described alkaline stemming is as follows:

Getting magnesite clinker, burnt foam, magnesium carbon reworked material, carbon containing resin-oatmeal, silicon carbide, Jiaozhuo clay, light-burning magnesium powder, α-aluminum oxide, andaluzite powder by described weight proportion inserts in edge runner-wet mill and is dry mixed 3～5 minutes, add again resin mixed grind 20～30 minutes, resin is fully moistened to be dipped in mixed powder, after thering is certain plasticity-, extrude by stemming extruder.