阅读说明：本技术 一种炼铁高炉用铝钛碳化硅复合耐火浇注料 (Aluminum titanium silicon carbide composite refractory castable for iron-making blast furnace ) 是由 徐瀟晗 何汝生 吴敏 于 2021-01-15 设计创作，主要内容包括：本发明公开了一种炼铁高炉用铝钛碳化硅复合耐火浇注料,其组成成分的质量百分比为：Al-2O-3：56％-78％、TiO-2：4％-16％、SiC：5％-18％、Fe-2O-3：0.1％-1.5％、SiO-2：5％-34％、其余为CaO和MgO、K-2O、Na-2O：0.3％-2.0％。本发明提供的一种炼铁高炉用铝钛碳化硅复合耐火浇注料,可用于炉缸内衬、铁口区域、风口区域、冷却壁工作端浇注和炉腹、炉腰以及炉身中上部等部位的湿法喷涂等等。使用中,铝钛碳化硅复合耐火浇注料中的TiO-2组分与高炉内的N-2、CO、C接触时,在接触界面上生成高硬度、耐火度高、稳定性好的碳氮化物,从而提高了耐火浇注料自身抵御炉内产物化学侵蚀、机械冲刷的能力,所砌筑的炉衬具有了自保护功能,降低了炉衬的破损速率,延长了冷却设备、炉壳等的使用周期,因此将延长高炉寿命。(The invention discloses an aluminum titanium silicon carbide composite refractory castable for an iron-making blast furnace, which comprises the following components in percentage by mass: al (Al) 2 O 3 ：56％‑78％、TiO 2 ：4％‑16％、SiC：5％‑18％、Fe 2 O 3 ：0.1％‑1.5％、SiO 2 : 5 to 34 percent of CaO, the balance of MgO and K 2 O、Na 2 O: 0.3 to 2.0 percent. The aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace can be used for casting a furnace hearth lining, an iron notch area, a tuyere area and a working end of a cooling wall, and wet spraying of a furnace belly, a furnace waist, the middle upper part of a furnace body and the like. In use, TiO in the aluminum titanium silicon carbide composite refractory castable 2 Composition and N in blast furnace 2 When CO and C are contacted, carbonitride with high hardness, high refractoriness and good stability is generated on a contact interface, so that the capability of the refractory castable in resisting chemical erosion and mechanical scouring of products in the furnace is improved, the built furnace lining has a self-protection function, and the furnace lining is reducedThe rate of damage of (2) prolongs the life cycle of the cooling equipment, furnace shell, etc., and thus will prolong the life of the blast furnace.)

1. An aluminum titanium silicon carbide composite refractory castable for an iron-making blast furnace is characterized in that: the weight percentages of the components are as follows: al (Al)₂O₃：56％-78％、TiO₂：4％-16％、SiC：5％-18％、Fe₂O₃：0.1％-1.5％、SiO₂: 5 to 34 percent of CaO, the balance of MgO and K₂O、Na₂O：0.3％-2.0％。

2. The method of claim 1The aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace is characterized in that: the aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace comprises the following specific components in percentage by mass: al (Al)₂O₃：77％、TiO₂：6％、SiC：9％、Fe₂O₃：0.4％、SiO₂: 7 percent of CaO, MgO and K₂O、Na₂O：0.6％。

3. The aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace as claimed in claim 1, wherein: the aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace comprises the following specific components in percentage by mass: al (Al)₂O₃：67％、TiO₂：12％、SiC：10％、Fe₂O₃：0.7％、SiO₂: 8.8 percent of CaO, MgO and K₂O、Na₂O：1.5％。

4. The aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace as claimed in claim 1, wherein: the aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace comprises the following specific components in percentage by mass: al (Al)₂O₃：57％、TiO₂：4％、SiC：5％、Fe₂O₃：0.6％、SiO₂: 32 percent of CaO, MgO and K₂O、Na₂O：1.4％。

5. The aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace as claimed in claim 1, wherein: the titanium oxide in the aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace simultaneously contains Ti₂O₃Or TiO₂And Al₂O₃The component of the aluminum-titanium composite raw material is provided or is provided by TiO₂Particles, TiO₂The powder is provided or provided by other materials rich in titanium oxide.

6. The aluminum titanium silicon carbide composite for the ironmaking blast furnace according to claim 5The refractory castable is characterized in that: TiO in the aluminum-titanium composite raw material₂The mass percentage of the content is 6 percent to 26 percent, and Al₂O₃The mass percentage of the content is 70-90 percent, and the rest 1-5 percent is Fe₂O₃、CaO、MgO、K₂O、Na₂O。

7. The aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace as claimed in claim 1, wherein: the binding agent adopted during the construction of the aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace is water, silica sol or pre-added silica gel solid fine powder, and the construction of the aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace is carried out in a pouring or wet spraying mode.

Technical Field

The invention relates to the technical field of refractory materials for an iron-making blast furnace, in particular to an aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace.

Background

The refractory castable adopted by the lining of the iron-making blast furnace at present mainly comprises corundum, corundum-silicon carbide, ASC refractory castable and the like, and the application range of the refractory castable is mainly used for casting the lining of a furnace hearth, an iron notch area, a tuyere area and a working end of a cooling wall, and wet spraying of the middle upper part and the like of a furnace belly, a furnace waist and a furnace body.

The refractory lining in the blast furnace is in a working environment with molten iron slag and full of high-temperature, high-pressure and high-flow-rate coal gas. The working environment of the furnace belly part also has the disadvantages of extremely high erosiveness to refractory materials, such as primary iron, primary slag and the like. In the smelting process of the blast furnace, when molten iron slag, high-speed coal gas flow and the like contact working surfaces of the refractory linings, chemical erosion and mechanical scouring are generated on refractory materials. Because oxides and non-oxides forming the refractory lining materials cannot form compounds beneficial to self protection under the atmosphere in the blast furnace, the original structure and the self structural strength can only be relied on to resist the chemical erosion and the mechanical erosion of molten slag iron, high-speed gas flow and other harmful elements, the thickness of the lining is inevitably reduced gradually along with the service time, although the hot surface of the lining can form 'slag crust' for resisting the chemical erosion and the mechanical erosion under the cooling action of cooling equipment of the blast furnace, the chemical erosion and the mechanical erosion still exist before new slag crust is formed after old slag crust falls off, and the thickness of the refractory lining is still reduced continuously.

The refractory lining formed by the castable used at present of the blast furnace has the defects that the thickness of the furnace lining is gradually reduced under the chemical erosion and mechanical scouring of products in the furnace, and finally the protection function of devices such as cooling equipment, a furnace shell and the like is lost, so that the devices cannot obtain a long service life, and the service life of the blast furnace is further shortened.

Disclosure of Invention

Aiming at the technical defects of the existing castable for the iron-making blast furnace lining, the invention aims to provide the aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace, which replaces the existing refractory castable for the iron-making blast furnace lining, improves the service cycle of the blast furnace lining and prolongs the service life of the blast furnace.

The theoretical basis of the invention is to make full use of the special reducing atmosphere of oxygen deficiency, nitrogen enrichment and carbon enrichment in the blast furnace to promote the titanium oxide compositely existing in the furnace lining material to be combined with nitrogen and carbon elements in the furnace, and form titanium nitride and titanium carbide protective layers with high melting point and high wear resistance on the surface of the furnace lining material. Moreover, as the surface protective layer formed in the early stage is corroded and disappears, a new protective layer is generated immediately, continuous new and old replacement of the surface protective layer of the refractory material is formed, the self-protection of the furnace lining is realized, and the service life of the furnace lining is prolonged.

The technical scheme of the invention is as follows:

the invention provides an aluminum titanium silicon carbide composite refractory castable for an iron-making blast furnace, which is prepared by the procedures of weighing, mixing and packaging raw materials which are the same as the common refractory castable, and the prepared aluminum titanium silicon carbide composite refractory castable comprises the following components in percentage by mass: al (Al)₂O₃：56％-78％、TiO₂：4％-16％、SiC：5％-18％、Fe₂O₃：0.1％-1.5％、SiO₂: 5 to 34 percent of CaO, MgO and K and the balance of 0.3 to 2.0 percent of₂O、Na₂O。

The aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace preferably comprises the following specific components in percentage by mass: al (Al)₂O₃：77％、TiO₂：6％、SiC：9％、Fe₂O₃：0.4％、SiO₂: 7 percent of CaO, MgO and K and the balance of 0.6 percent₂O、Na₂O。

The aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace can be selected from the following components in percentage by mass: al (Al)₂O₃：67％、TiO₂：12％、SiC：10％、Fe₂O₃：0.7％、SiO₂: 8.8 percent of CaO, MgO and K and the balance of 1.5 percent₂O、Na₂O。

The aluminum-titanium composite refractory castable for the iron-making blast furnace can also comprise the following specific components in percentage by mass: al (Al)₂O₃：57％、TiO₂：4％、SiC：5％、Fe₂O₃：0.6％、SiO₂: 32 percent of CaO, MgO and K and the balance of 1.4 percent₂O、Na₂O。

Aluminum titanium silicon carbide for iron-smelting blast furnaceThe titanium oxide in the composite refractory castable simultaneously contains Ti₂O₃Or TiO₂And Al₂O₃The component of the aluminum-titanium composite raw material is provided or is provided by TiO₂Particles, TiO₂Powder supply or other titanium oxide-rich material supply.

TiO in aluminium-titanium composite raw material₂6 to 26 percent (mass percent) of Al₂O₃The content is 70-90% (mass percent), and the rest 1-5% is Fe₂O₃、CaO、MgO、K₂O、Na₂O。

The binding agent adopted in the construction of the aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace can adopt water, silica sol or pre-added silica gel solid fine powder.

The construction method of the aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace can be either support pouring or wet spraying by using spraying equipment.

Compared with the prior art, the invention has the beneficial effects that: the aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace can be used for casting a furnace hearth lining, an iron notch area, a tuyere area and a working end of a cooling wall, and wet spraying of a furnace belly, a furnace waist, the middle upper part of a furnace body and the like. In use, TiO in the aluminum titanium silicon carbide composite refractory castable₂Composition and N in blast furnace₂When CO and C are contacted, carbonitride with high hardness, high refractoriness and good stability is generated on a contact interface, so that the capability of the refractory castable for resisting chemical erosion and mechanical scouring of products in the furnace is improved, the built furnace lining has a self-protection function, the damage rate of the furnace lining is reduced, the service life of cooling equipment, a furnace shell and the like is prolonged, and the service life of the blast furnace is prolonged.

The production process is simple, and the raw material inspection (granule, powder and binding agent) comprises automatic batching, packaging and delivery inspection; the construction process comprises the following steps: intensive mixers-dry mixing-addition of water or wet mixing of silica sol-pouring to the mold or spraying using spraying equipment. The key point is that the refractory material is an unshaped product which is different from a formed product, and the trend of gradually replacing the formed product with the unshaped product is the development trend of the refractory material. Its main advantages are simple process and convenient construction.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Example 1:

the invention is embodied by the following steps of mixing fused corundum particles, silicon carbide particles and 13% TiO₂(mass%) 82% of Al₂O₃The aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace is prepared by mixing aluminum titanium composite raw materials according to the process material ratio to form a mixture, and then mixing the mixture with silicon carbide fine powder, alpha-alumina micro powder, silicon oxide micro powder, calcium aluminate cement, sodium tripolyphosphate and a water reducing agent after weighing according to the process material ratio.

The specific composition and the technical performance of the sample preparation test of the aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace in the embodiment are shown in table 1. The binder employed in this embodiment is water.

Example 2:

the invention is implemented by mixing fused corundum particles, silicon carbide particles, mullite particles and a mixture containing 24 percent of TiO₂(mass%) 75% of Al₂O₃The aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace is prepared by mixing aluminum titanium composite raw materials according to the process material ratio to form a mixture, weighing the mixture and silicon carbide fine powder, alpha-alumina micro powder, silicon oxide micro powder, calcium aluminate cement, sodium tripolyphosphate, a water reducing agent and the like according to the process material ratio, and mixing the mixture.

The specific composition and the technical performance of the sample preparation test of the aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace in the embodiment are shown in table 1. The binder employed in this embodiment is water.

Example 3:

the invention is embodied in that mullite grains are formedFlint clay particles, silicon carbide particles and compositions containing 10% TiO₂(mass%) 86% of Al₂O₃The aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace is prepared by mixing aluminum titanium composite raw materials according to the process material ratio to form a mixture, weighing the mixture and silicon carbide fine powder, alpha-alumina micro powder, silicon oxide micro powder, calcium aluminate cement, sodium tripolyphosphate, a water reducing agent and the like according to the process material ratio, and mixing the mixture.

The specific composition and the technical performance of the sample preparation test of the aluminum titanium silicon carbide composite refractory castable for the iron-making blast furnace in the embodiment are shown in table 1. The binder employed in this embodiment is water.

TABLE 1 composition and technical Properties of the composite refractory castable of aluminum titanium silicon carbide

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.