阅读说明：本技术 一种高炉出铁沟用修补料及制备方法 (Repairing material for blast furnace iron tap channel and preparation method thereof ) 是由 张立国 朱建伟 李金莲 李仲 赵正洪 赵德胜 张伟 任伟 韩子文 王亮 于 2019-09-29 设计创作，主要内容包括：本发明涉及耐火材料技术领域,特别涉及一种高炉出铁沟用修补料及制备方法。包括以下重量份的原料：除尘灰3～15份；膨润土5～3份0；刚玉粉20～50份；氧化铝微粉5～20份；铝酸钙粉3～15份；氮化硅粉5～25份；结合剂10～35份。本发明采用除尘灰、膨润土等廉价物料,利用其廉价易得的优势,作为高炉铁沟用修补料的部分原料,可以做到在较大幅度减少铁口维护成本、维护工作量的同时,提升出铁沟的通铁量,进而实现降低炼铁生产成本的效果。(The invention relates to the technical field of refractory materials, in particular to a repair material for a blast furnace tapping channel and a preparation method thereof. The feed comprises the following raw materials in parts by weight: 3-15 parts of dedusting ash; 5-3 parts of bentonite 0; 20-50 parts of corundum powder; 5-20 parts of alumina micro powder; 3-15 parts of calcium aluminate powder; 5-25 parts of silicon nitride powder; 10-35 parts of a binding agent. The invention adopts cheap materials such as dedusting ash and bentonite, and utilizes the advantages of low price and easy availability as partial raw materials of the repairing material for the blast furnace iron runner, thereby improving the iron passing amount of the iron runner while greatly reducing the maintenance cost and the maintenance workload of the iron notch, and further realizing the effect of reducing the iron-making production cost.)

1. The repair material for the blast furnace tapping channel is characterized by comprising the following raw materials in parts by weight:

2. the repairing material for the blast furnace tapping runner as claimed in claim 1, wherein the fly ash is one or more of coking dry fly ash, water coke quenching powder, blast furnace gas ash, blast furnace dry fly ash, blast furnace stokehole fly ash and blast furnace ore coke groove fly ash, and the part with the particle size control range of the fly ash being less than or equal to 0.074mm accounts for not less than 60% of the whole mass of the fly ash.

3. The repairing mix for the blast furnace tapping runner as claimed in claim 1, wherein the bentonite has a montmorillonite content of not less than 57%, and the bentonite has a total mass proportion of not less than 90% in a particle size control range of not more than 0.074 mm.

4. The repair mass for a blast furnace runner according to claim 1, wherein the corundum powder contains Al₂O₃The content is not less than 57 percent, and the part with the granularity control range of less than or equal to 0.125mm accounts for not less than 65 percent of the whole mass of the corundum powder.

5. The repair mass for a blast furnace runner according to claim 1, wherein the fine alumina powder contains Al₂O₃The content is not less than 97 percent, and the part with the granularity control range of less than or equal to 0.074mm accounts for not less than 90 percent of the whole mass of the alumina powder.

6. The repair material for a blast furnace runner according to claim 1, wherein Al in the calcium aluminate powder₂O₃Not less than 50%, CaO not more than 25%, MgO not more than 3%, SiO₂Not more than 8% of Fe₂O₃Not more than 3 percent, and the calcium aluminate powder with the granularity control range of not more than 0.125mm accounts for not less than 95 percent of the whole mass of the calcium aluminate powder.

7. The repair mass for a blast furnace runner according to claim 1, wherein Si in the silicon nitride powder is Si₃N₄The content is not less than 97 percent, and the part with the granularity control range of not more than 0.074mm accounts for not less than 90 percent of the whole mass of the ferrosilicon nitride.

8. The repair mass for a blast furnace runner according to claim 1, wherein the binder is one or more of tar and high temperature asphalt, and one or more of phenol resin and sodium tripolyphosphate.

9. The preparation method of the repair mass for the blast furnace runner according to claim 1 is characterized by comprising the following steps:

1) taking the dedusting ash, the bentonite, the corundum powder, the alumina micro powder, the calcium aluminate powder, the silicon nitride powder and the binding agent as the iron tap channel repairing materials, and putting the materials into a mixer according to the different mass proportions in no sequence;

2) grinding the mixture for 20-60 min to prepare the repairing material for the blast furnace tapping channel.

Technical Field

The invention relates to the technical field of refractory materials, in particular to a repair material for a blast furnace tapping channel and a preparation method thereof.

Background

Along with the rapid development of society, the demand for different types of materials is increasing, especially for black materials represented by steel, in order to meet the situation, metallurgical enterprises also continuously expand the self-productivity from time to time, and the specific expression shows that blast furnaces and converters present a changing trend of distinguishing the prior large-scale and automatic control, so as to meet the demand of different industries of society for steel products. In the blast furnace, the development trend of large-scale and intensified smelting in recent years is experienced, the energy consumption per ton of iron is continuously reduced while the capacity is increased, and the blast furnace is still the iron-making equipment with the highest utilization efficiency, so that the blast furnace iron-making in the modern iron-making process has strong competitiveness. The large-scale blast furnace and the intensified smelting bring about some problems. One of the problems is that the daily output is greatly increased along with the improvement of the effective furnace volume and the smelting intensity, so that the tapping time of the blast furnace is prolonged, and the tapping quantity of the tap hole is increased, and although the modern large-scale blast furnace adopts a mode of alternately tapping by a plurality of tap holes (3 or 4), the iron passing quantity is still greatly increased compared with the prior art in terms of a single tapping channel, and reaches or exceeds the level of 15 ten thousand tons at present. The iron flux is increased, the corrosion of the refractory of the molten iron channel is increased day by day, the maintenance cost and the workload of enterprises are increased, and along with the extremely severe market situation, the cost competition becomes the core match among the enterprises, so that the cost of each enterprise is reduced, and the method is urgent for the survival of the enterprises.

A plurality of iron and steel enterprises realize that the service life of the iron tapping channel is prolonged, the manufacturing and processing cost of ton iron is reduced, and great economic benefits are brought to the enterprises. Therefore, a plurality of enterprises and universities, such as Baoku, river steel, sand steel, Beijing technology university, northeast university and other units develop the subject research of prolonging the service life of the tapping runner, and a series of tapping runner materials and structure technologies are formed on the basis of multi-aspect analysis and industrial practice of the erosion mechanism of the furnace lining, temperature gradient distribution and the like of the tapping runner in the using process, and a better using effect is obtained in the actual production. For example, materials such as carbon fiber, silicon carbide, silicon nitride and some unique bonding agents are added in the material to resist the corrosion of iron slag in the tapping process; or the structure adopts a unique design mode, and the heat preservation and the quick replacement of the tapping runner are realized by using the technologies of replaceable linings, external lining bodies and the like; the design structure adopts a composite medium and an external cooling means to increase the erosion resistance of the molten iron runner; and the application of the technologies of gunning materials is also used for realizing the rapid repair of the iron runner, and the application and implementation of the technologies can prolong the service life of the casting working layer of the iron runner. However, the price of good maintenance materials for tapping runners is always higher, which also becomes one of the difficulties in reducing the manufacturing cost of pig iron for enterprises.

The service life of the iron tapping runner is closely related to the manufacturing cost of ton iron, and the suitable iron runner material has price advantages except the using effects of better heat preservation and slag iron corrosion resistance, and the iron-making production cost can be reduced only by realizing the price advantages. In this regard, many institutions and enterprises have developed research in this regard and put different technologies into practice. For example, the technology of gunning and pouring repair of iron runners by using different refractory materials (see Chinese patent 'a gunning material for blast furnace iron runners' patent application No. CN104086191A, 'improved refractory castable material for blast furnace iron runners' patent application No. CN1641048, 'main gunning material for single-taphole blast furnace iron runners' patent application No. CN102557696A, 'hot gunning material for iron runners' patent application No. CN102101781A10, 'castable material and main single-taphole blast furnace iron storage type iron runner' patent application No. CN102557697A 'of the castable material, a phosphate-bonded hot-state repairing iron runner gunning material for iron runners' patent application No. CN103113120A, 'self-flowing hot-repairing material and manufacturing method' patent application No. CN1160030, etc.), the gunning material for iron runners manufactured by the technology is suitable for the parts on the iron runners which are corroded seriously and need to be repaired, can prolong the service life of the iron runners, and can reduce the labor intensity of operation in front of the furnace, the iron passing amount is improved, so that the production capacity effect of the blast furnace is improved, but the purchase price is increasedThe cost is high, which is not beneficial to reducing the production cost of iron-making. The invention also relates to a technology for reasonably designing and installing the iron hook (see Chinese patent 'a blast furnace iron runner capable of repairing binding slurry' patent application No. CN202786290U, 'an iron runner composite lining body of sialon combined refractory material and a manufacturing method thereof' patent application No. CN103642960A, 'iron runner material prefabricated member for a blast furnace iron-tapping field' patent application No. CN205133640U, 'an exchangeable blast furnace iron runner' patent application No. CN205275628U, 'an integrally assembled blast furnace iron runner' patent application No. CN201971846U, 'prefabricated member for a blast furnace iron runner or a slag runner mouth' patent application No. CN202090006U and the like), can realize the effects of shortening the initial construction period, the baking period and the re-excavation and repair construction period, has the characteristics of strong slag iron corrosion resistance, scouring resistance and the like in the using process, can improve the service life of the iron runner, and provides guarantee for the smooth production and high yield of the blast furnace of a steel plant, the economic benefit is improved, but the defects are that the integral construction is needed, and the one-time investment is large. Still other technologies, such as adopting multilayer composite materials or other methods to improve the daily iron flux of the blast furnace iron runner (see the Chinese patent "blast furnace iron runner with blast furnace iron runner castable and impact zone lining" patent application No. CN203346412U, "blast furnace iron runner with liner easy to replace" patent application No. CN108085443A, "blast furnace iron runner with additive" patent application No. CN202881300U, etc.), can improve the thermal shock stability and oxidation resistance of the iron runner, enhance the slag and iron corrosion resistance and scouring resistance, but have the disadvantages of complex structure, high use cost and limited effect. In addition, it is the literature that can be looked up at home and abroad for the technical discussion in this respect (see journal "refractory material" Al)₂O₃Research and application of SiC-C wet spray castable "2012, volume 42, phase 2, 119; "laboratory development of gunning materials for blast furnace tapping channel" in the refractory material "2001, volume 35, phase 3, 173; "longevity of blast furnace tapping channel technology research" new progress in "Sichuan metallurgy" 2009, volume 31, stage 1, 57; in the year 2001, in the iron-making research on the blast furnace iron runner self-flowing castable,20 volumes, 4 th, 36, etc.), and a plurality of literature documents discuss that Al is adopted in the iron tapping channel of the large-scale blast furnace at present₂O₃the-SiC-C castable has the advantages of safe use, long service life, less consumption and convenient construction and maintenance, and makes great contribution to the stable and normal production of the blast furnace; the gunning material for repairing is mainly made of brown corundum as aggregate, and additionally, some corundum and silicon carbide fine powder are added, and the material of the gunning material for repairing is also in the aspect of finished product formula using special-grade bauxite as aggregate, but the documents are less discussed about cost factors, such as how to reduce maintenance cost of the iron hook, operation cost of the iron hook and blast furnace connection. Thus, with the prior art, routine maintenance of the runner has a large space to reduce costs.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a repair material for a blast furnace tapping channel and a preparation method thereof. The iron-passing amount of the iron tapping channel is improved while the maintenance cost and the maintenance workload of the iron notch are greatly reduced, and the effect of reducing the iron-making production cost is further realized.

In order to achieve the purpose, the invention adopts the following technical scheme:

the repair material for the blast furnace tapping channel comprises the following raw materials in parts by weight:

the part of the dust removal ash with the granularity control range of less than or equal to 0.074mm accounts for not less than 60 percent of the whole mass of the dust removal ash.

The content of montmorillonite in the bentonite is not less than 57%, and the proportion of the part with the granularity control range of not more than 0.074mm in the whole mass of the bentonite is not less than 90%.

Al in the corundum powder₂O₃The content is not less than 57 percent, and the part with the granularity control range of less than or equal to 0.125mm accounts for not less than 65 percent of the whole mass of the corundum powder.

Al in the alumina micro powder₂O₃The content is not less than 97 percent, the part with the granularity control range of less than or equal to 0.074mm accounts for the whole mass ratio of the alumina powderFor example, not less than 90%.

Al in the calcium aluminate powder₂O₃Not less than 50%, CaO not more than 25%, MgO not more than 3%, SiO₂Not more than 8% of Fe₂O₃Not more than 3 percent, and the calcium aluminate powder with the granularity control range of not more than 0.125mm accounts for not less than 95 percent of the whole mass of the calcium aluminate powder.

Si in the silicon nitride powder₃N₄The content is not less than 97 percent, and the part with the granularity control range of not more than 0.074mm accounts for not less than 90 percent of the whole mass of the ferrosilicon nitride.

The binding agent is formed by combining one or more of tar and high-temperature asphalt with one or more of phenolic resin and sodium tripolyphosphate.

A preparation method of a repairing material for a blast furnace tapping channel comprises the following steps:

(1) taking the dedusting ash, the bentonite, the corundum powder, the alumina micro powder, the calcium aluminate powder, the silicon nitride powder and the binding agent as the iron tap channel repairing materials, and putting the materials into a mixer according to the different mass proportions in no sequence;

(2) grinding the mixture for 20-60 min to prepare the repairing material for the blast furnace tapping channel.

Compared with the prior art, the invention has the beneficial effects that:

the invention adopts cheap materials such as dedusting ash and bentonite, and utilizes the advantages of low price and easy availability as partial raw materials of the repairing material for the blast furnace iron runner, thereby improving the iron passing amount of the iron runner while greatly reducing the maintenance cost and the maintenance workload of the iron notch, and further realizing the effect of reducing the iron-making production cost.

Detailed Description

The following further illustrates embodiments of the invention, but is not intended to limit the scope thereof:

the repair material for the blast furnace tapping channel comprises the following raw materials in parts by weight:

the dust removal ash is one or more of coking dry method dust removal ash, water coke quenching powder, blast furnace gas ash, blast furnace dry method dust removal ash, blast furnace stokehole dust removal ash and blast furnace ore coke groove dust removal ash, and the part of the dust removal ash with the granularity control range of less than or equal to 0.074mm accounts for not less than 60 percent of the whole mass of the dust removal ash.

The content of montmorillonite in the bentonite is not less than 57%, and the proportion of the part with the granularity control range of not more than 0.074mm in the whole mass of the bentonite is not less than 90%.

Al in the corundum powder₂O₃The content is not less than 57 percent, and the part with the granularity control range of less than or equal to 0.125mm accounts for not less than 65 percent of the whole mass of the corundum powder.

Al in the alumina micro powder₂O₃The content is not less than 97 percent, and the part with the granularity control range of less than or equal to 0.074mm accounts for not less than 90 percent of the whole mass of the alumina powder.

Al in the calcium aluminate powder₂O₃Not less than 50%, CaO not more than 25%, MgO not more than 3%, SiO₂Not more than 8% of Fe₂O₃Not more than 3 percent, and the calcium aluminate powder with the granularity control range of not more than 0.125mm accounts for not less than 95 percent of the whole mass of the calcium aluminate powder.

Si in the silicon nitride powder₃N₄The content is not less than 97 percent, and the part with the granularity control range of not more than 0.074mm accounts for not less than 90 percent of the whole mass of the ferrosilicon nitride.

The binding agent is formed by combining one or more of tar and high-temperature asphalt with one or more of phenolic resin and sodium tripolyphosphate.

A preparation method of a repairing material for a blast furnace tapping channel comprises the following steps:

(1) taking the dedusting ash, the bentonite, the corundum powder, the alumina micro powder, the calcium aluminate powder, the silicon nitride powder and the binding agent as the iron tap channel repairing materials, and putting the materials into a mixer according to the different mass proportions in no sequence;

(2) grinding the mixture for 20-60 min to prepare the repairing material for the blast furnace tapping channel.

The following describes the embodiments of the present invention with reference to 5 examples, and the details are as follows.