阅读说明：本技术 一种高炉出铁口用炮泥及其制备方法 (Stemming for blast furnace taphole and preparation method thereof ) 是由 梁永和 鞠茂奇 聂建华 蔡曼菲 于 2019-09-29 设计创作，主要内容包括：本发明涉及一种高炉出铁口用炮泥及其制备方法。其技术方案是：以3～20wt％的钛铁渣颗粒、5～10wt％的刚玉颗粒和10～18wt％的焦炭为骨料,以2～15wt％的钛铁渣细粉、5～10wt％的刚玉细粉、15～25wt％的碳化硅、10～18wt％的粘土、4～8wt％的绢云母、4～8wt％的蓝晶石和6～14wt％的氮化硅铁为基质；先向骨料中加入占骨料和基质之和的4～5wt％的结合剂,搅拌,再加入基质,混合,得预混料；再向预混料中加入占骨料和基质之和的8～11wt％的结合剂,继续搅拌,然后用挤泥机挤压成块,即得高炉出铁口用炮泥。本发明生产成本低,所制制品体积密度小、体积稳定性好、透气性好、耐压强度高和抗侵蚀性能好,能起到修复和维护高炉出铁口的作用。(The invention relates to stemming for a blast furnace taphole and a preparation method thereof. The technical scheme is as follows: 3-20 wt% of ferrotitanium slag particles, 5-10 wt% of corundum particles and 10-18 wt% of coke are used as aggregates, and 2-15 wt% of ferrotitanium slag fine powder, 5-10 wt% of corundum fine powder, 15-25 wt% of silicon carbide, 10-18 wt% of clay, 4-8 wt% of sericite, 4-8 wt% of kyanite and 6-14 wt% of ferrosilicon nitride are used as substrates; firstly, adding a bonding agent accounting for 4-5 wt% of the aggregate and the matrix, stirring, then adding the matrix, and mixing to obtain a premix; and adding a bonding agent accounting for 8-11 wt% of the total of the aggregate and the matrix into the premix, continuously stirring, and extruding into blocks by using a mud extruder to obtain the stemming for the blast furnace taphole. The invention has low production cost, and the prepared product has small volume density, good volume stability, good air permeability, high compressive strength and good erosion resistance, and can play a role in repairing and maintaining the blast furnace taphole.)

1. A preparation method of stemming for a blast furnace taphole is characterized by comprising the following steps: 3-20 wt% of ferrotitanium slag particles, 5-10 wt% of corundum particles and 10-18 wt% of coke are used as aggregates, and 2-15 wt% of ferrotitanium slag fine powder, 5-10 wt% of corundum fine powder, 15-25 wt% of silicon carbide, 10-18 wt% of clay, 4-8 wt% of sericite, 4-8 wt% of kyanite and 6-14 wt% of ferrosilicon nitride are used as substrates;

adding a bonding agent accounting for 4-5 wt% of the aggregate and the matrix into the aggregate, stirring for 8-10 min, adding the matrix, and mixing to obtain a premix; adding the bonding agent accounting for 8-11 wt% of the total weight of the aggregate and the matrix into the premix, continuously stirring for 10-12 min, and extruding into blocks by using a mud extruder to obtain the stemming for the blast furnace taphole;

the titanium iron slag comprises the following chemical components: al (Al)₂O₃Content is more than or equal to 70.0 wt%, TiO₂The content is more than or equal to 15.0 wt%; wherein: the particle size of the titanium-iron slag particles is larger than 1mm and smaller than or equal to 3mm, and the particle size of the titanium-iron slag fine powder is 0.044-1 mm.

2. The method according to claim 1, wherein the corundum is at least one selected from the group consisting of tabular corundum, white corundum, and brown corundum, and the Al of the corundum is Al₂O₃More than or equal to 95.0 wt%; wherein: the particle size of the corundum particles is larger than 1mm and smaller than or equal to 3mm, and the particle size of the corundum fine powder is 0.044-1 mm.

3. The method for preparing stemming for a blast furnace taphole according to claim 1, characterized in that the C content of the coke is not less than 85.0 wt%; the particle size of the coke is 1-3 mm.

4. The method for preparing the stemming for a blast furnace taphole according to claim 1, characterized in that the SiC content of the silicon carbide is more than or equal to 97.0 wt%; the particle size of the silicon carbide is 0.088-1 mm.

5. The method for producing a stemming for a blast furnace taphole according to claim 1, characterized in that the clay comprises the chemical components: al (Al)₂O₃The content is more than or equal to 35.0 wtwt%, SiO₂Content is more than or equal to 50.0 wt%, K₂The content of O is less than or equal to 1.5 wt%; the particle size of the clay is less than or equal to 0.088 mm.

6. The method of preparing stemming for a blast furnace taphole according to claim 1, characterized in that the sericite comprises the chemical components: al (Al)₂O₃The content is more than or equal to 10.0wt percent,SiO₂content is more than or equal to 80.0 wt%, K₂The content of O is less than or equal to 1.5 wt%; the grain diameter of the sericite is less than or equal to 0.088 mm.

7. The method for preparing stemming for a blast furnace taphole according to claim 1, characterized in that the kyanite has the chemical composition: al (Al)₂O₃The content is more than or equal to 35.0wt percent, and SiO is₂The content is more than or equal to 55.0 wt%; the grain diameter of the kyanite is less than or equal to 0.088 mm.

8. The method of producing stemming according to claim 1, wherein Si of said ferrosilicon nitride is Si₃N₄The content is more than or equal to 75.0 wt%; the grain diameter of the ferrosilicon nitride is less than or equal to 0.088 mm.

9. The method according to claim 1, wherein the binder is a mixture of a thermosetting liquid phenol resin, tar and anthracene oil, and in the mixture: the mass ratio of the thermosetting liquid phenolic resin to the tar to the anthracene oil is 100 to (550-650) to (250-350).

10. A stemming for a blast furnace taphole, characterized in that the stemming for a blast furnace taphole is the stemming for a blast furnace taphole prepared by the method for preparing the stemming for a blast furnace taphole according to any one of claims 1 to 9.

Technical Field

The invention belongs to the technical field of stemming. In particular to stemming for a blast furnace taphole and a preparation method thereof.

Background

Stemming is a necessary refractory material in the ferrous metallurgy industry, and if the stemming quality is poor, a series of problems can be generated during use, and normal production is influenced. Therefore, the stemming is required: the operation performance is good, and the iron notch can be fully filled; the volume stability is good, and the shrinkage does not occur during service; the sintering property is good, and the strength can be generated by rapid sintering; has good slag resistance, molten iron erosion resistance, scouring resistance and oxidation resistance.

At present, the blast furnace is developed towards long service life, high-strength smelting and large-scale production, and the quality requirement of the stemming for the blast furnace taphole is more and more strict. On the premise of controlling cost, the stemming is continuously improved and enhanced in material and quality, and the stemming is changed from a pure consumable refractory material to a functional refractory material. The blast furnace output is improved, the slag iron flow is increased, and the taphole is easy to be brushed to form a horn shape in the service process, so that the taphole is difficult to maintain. Therefore, it has become one of the concerns of those skilled in the art to develop a stemming product that can satisfy the requirements of low cost, good performance and maintenance of a taphole.

The ferrotitanium slag is used as slag produced in the production of ferrotitanium alloy by an external smelting method, is a multi-phase composite material, and is always piled as solid waste. The ferrotitanium slag has the excellent characteristics of small heat conductivity coefficient, high wear resistance, high refractoriness and the like, so the ferrotitanium slag is added into a stemming refractory material (Wang Ling cloud, Qiu Wen winter, Liang Yong, and the influence of calcium titanium aluminate on the performance of the environment-friendly stemming [ J ] metallurgy and materials, 2019 (2)), so that the utilization of solid wastes can be realized, and the product cost can be reduced. However, the technology only considers the solid waste utilization and cost reduction, so that the impurity phase in the titanium-iron slag seriously influences the high-temperature performance of the stemming.

The patent technology of 'anhydrous stemming for a blast furnace taphole' (CN102898170A) takes titanium dioxide, silicon carbide, corundum, silicon nitride, mullite, calcium-free chromium slag and coke as raw materials and resin and the like as a bonding agent. Although the invention has better volume density and strength, the adopted titanium dioxide is relatively expensive and has overhigh production cost, and simultaneously, the addition of a large amount of titanium dioxide can improve the sintering performance of the stemming, so that the stemming shrinks in the service process, the molten iron further erodes the taphole if the stemming is light, and the molten iron leaks if the stemming is heavy.

The patent technology of 'an anhydrous stemming for maintaining a blast furnace hearth and a preparation method thereof' (CN102603312A) takes special-grade alumina, brown fused alumina, silicon carbide, coke, ball clay, sericite, kyanite, titanium dioxide, silicon nitride and titanium carbide as raw materials. Although the titanium carbide and the titanium dioxide adopted by the invention can improve the erosion resistance and the oxidation resistance of the stemming, the titanium carbide and the titanium dioxide are prepared from high-purity raw materials, and the cost is too high.

The invention discloses anhydrous stemming for a blast furnace taphole and a preparation method thereof (CN103044040A), and the technology takes brown corundum, high alumina, silicon carbide, soft clay, coke powder, silica and ferrosilicon nitride as raw materials and can basically meet the requirement of the stemming for the taphole, but the stemming has poor scouring resistance, and molten iron can continuously infiltrate due to loss in the service process, so that the taphole needs to be maintained frequently.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and aims to provide the preparation method of the stemming for the blast furnace taphole with low production cost.

In order to achieve the purpose, the invention adopts the technical scheme that: 3-20 wt% of ferrotitanium slag particles, 5-10 wt% of corundum particles and 10-18 wt% of coke are used as aggregates, and 2-15 wt% of ferrotitanium slag fine powder, 5-10 wt% of corundum fine powder, 15-25 wt% of silicon carbide, 10-18 wt% of clay, 4-8 wt% of sericite, 4-8 wt% of kyanite and 6-14 wt% of ferrosilicon nitride are used as matrixes.

Adding a bonding agent accounting for 4-5 wt% of the aggregate and the matrix into the aggregate, stirring for 8-10 min, adding the matrix, and mixing to obtain a premix; and adding the bonding agent accounting for 8-11 wt% of the total weight of the aggregate and the matrix into the premix, continuously stirring for 10-12 min, and extruding into blocks by using a mud extruder to obtain the stemming for the blast furnace taphole.

The titanium iron slag comprises the following chemical components: al (Al)₂O₃Content is more than or equal to 70.0 wt%, TiO₂The content is more than or equal to 15.0 wt%; wherein: the particle size of the titanium-iron slag particles is larger than 1mm and smaller than or equal to 3mm, and the particle size of the titanium-iron slag fine powder is 0.044-1 mm.

The corundum is more than one of plate corundum, white corundum and brown corundum, and Al of the corundum₂O₃More than or equal to 95.0 wt%; wherein: the particle size of the corundum particles is larger than 1mm and smaller than or equal to 3mm, and the particle size of the corundum fine powder is 0.044-1 mm.

The C content of the coke is more than or equal to 85.0 wt%; the particle size of the coke is 1-3 mm.

The SiC content of the silicon carbide is more than or equal to 97.0 wt%; the particle size of the silicon carbide is 0.088-1 mm.

The chemical components of the clay are as follows: al (Al)₂O₃The content is more than or equal to 35.0 wtwt%, SiO₂Content is more than or equal to 50.0 wt%, K₂The content of O is less than or equal to 1.5 wt%; the particle size of the clay is less than or equal to 0.088 mm.

The chemical components of the sericite are as follows: al (Al)₂O₃The content is more than or equal to 10.0wt percent, and SiO is₂Content is more than or equal to 80.0 wt%, K₂The content of O is less than or equal to 1.5 wt%; the grain diameter of the sericite is less than or equal to 0.088 mm.

The kyanite comprises the following chemical components: al (Al)₂O₃The content is more than or equal to 35.0wt percent, and SiO is₂The content is more than or equal to 55.0 wt%; the grain diameter of the kyanite is less than or equal to 0.088 mm.

Si of the silicon iron nitride₃N₄The content is more than or equal to 75.0 wt%; the grain diameter of the ferrosilicon nitride is less than or equal to 0.088 mm.

The binding agent is a mixture of thermosetting liquid phenolic resin, tar and anthracene oil, wherein: the mass ratio of the thermosetting liquid phenolic resin to the tar to the anthracene oil is 100 to (550-650) to (250-350).

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:

1. the invention uses ferrotitanium slag to replace corundum of aggregate and corundum of substrate part, the unit price of ferrotitanium slag is far lower than that of corundum, so that the production cost is obviously reduced; meanwhile, the solid waste of the ferrotitanium slag is utilized, and the resource utilization and the environmental protection are facilitated.

2. The invention uses ferrotitanium slag to partially replace corundum in aggregate and matrix partial corundum, because of the introduction of titanium-containing compound, titanium carbonitride can be generated at high temperature and deposited and attached to the damaged taphole, so that the prepared stemming for the taphole of the blast furnace has the functions of repairing and maintaining the taphole, and the service life of the taphole of the blast furnace is prolonged.

3. The invention uses ferrotitanium slag to replace corundum of aggregate part and corundum of substrate part, because the secondary crystal phase in the ferrotitanium slag is calcium dialuminate, the calcium dialuminate generates calcium hexaaluminate at high temperature and accompanies volume expansion, the shrinkage of clay and the like is counteracted while the strength is improved, and the volume stability of the blast furnace taphole stemming is obviously improved.

4. The invention uses the ferrotitanium slag to partially replace corundum of the aggregate part and corundum of the matrix part, and the ferrotitanium slag has more raw material gaps relative to the corundum, so that various volatile matters generated in the sintering process of the stemming for the blast furnace taphole can be effectively discharged, and the permeability is good.

The stemming for the blast furnace taphole prepared by the invention is detected as follows: the bulk density is 2.00-2.12 g/cm³(ii) a The breaking strength is 6.0-7.0 MPa; the compressive strength is 25.0-33.0 MPa; the air permeability is 14 to 18 mu m²(ii) a The Marshall value is 0.65-0.75 MPa; the corrosion index of the 1100 ℃ static crucible method slag resistance experiment is 1.0-5.0%.

Therefore, the production cost is low, and the prepared stemming for the blast furnace taphole has the advantages of small volume density, good volume stability, good air permeability, high compressive strength and good erosion resistance, and can play a role in repairing and maintaining the blast furnace taphole.

Detailed Description

The invention is further described with reference to specific embodiments, without limiting its scope.

In order to avoid repetition, the materials related to this specific embodiment are described in a unified manner, which is not described in the embodiments again:

the titanium iron slag comprises the following chemical components: al (Al)₂O₃Content is more than or equal to 70.0 wt%, TiO₂The content is more than or equal to 15.0 wt%; wherein: the particle size of the titanium-iron slag particles is larger than 1mm and smaller than or equal to 3mm, and the particle size of the titanium-iron slag fine powder is 0.044-1 mm.

Al of the corundum₂O₃More than or equal to 95.0 wt%; wherein: the particle size of the corundum particles is larger than 1mm and smaller than or equal to 3mm, and the particle size of the corundum fine powder is 0.044-1 mm.

The C content of the coke is more than or equal to 85.0 wt%; the particle size of the coke is 1-3 mm.

The SiC content of the silicon carbide is more than or equal to 97.0 wt%; the particle size of the silicon carbide is 0.088-1 mm.

The chemical components of the clay are as follows: al (Al)₂O₃The content is more than or equal to 35.0 wtwt%, SiO₂Content is more than or equal to 50.0 wt%, K₂The content of O is less than or equal to 1.5 wt%; the particle size of the clay is less than or equal to 0.088 mm.

The chemical components of the sericite are as follows: al (Al)₂O₃The content is more than or equal to 10.0wt percent, and SiO is₂Content is more than or equal to 80.0 wt%, K₂The content of O is less than or equal to 1.5 wt%; the grain diameter of the sericite is less than or equal to 0.088 mm.

The kyanite comprises the following chemical components: al (Al)₂O₃The content is more than or equal to 35.0wt percent, and SiO is₂The content is more than or equal to 55.0 wt%; the grain diameter of the kyanite is less than or equal to 0.088 mm.

Si of the silicon iron nitride₃N₄The content is more than or equal to 75.0 wt%; the grain diameter of the ferrosilicon nitride is less than or equal to 0.088 mm.

The binding agent is a mixture of thermosetting liquid phenolic resin, tar and anthracene oil, wherein: the mass ratio of the thermosetting liquid phenolic resin to the tar to the anthracene oil is 100 to (550-650) to (250-350).