阅读说明：本技术 一种高炉炉身冷却壁背部密封用高炉灌浆料 (Blast furnace grouting material for sealing back of cooling wall of blast furnace body ) 是由 牛春林 颜浩 张晓波 滕国强 王佳宁 任林 刘靖轩 于 2021-07-15 设计创作，主要内容包括：本发明公开了一种高炉炉身冷却壁背部缝隙密封用高炉灌浆料,涉及灌浆料加工技术领域。本发明耐火灌浆料包括以下质量份数的原料：矾土70～95份,硅微粉1～8份,固化剂0～5份,复合膨胀剂1～8份,分散剂0.1～0.5份,结合剂15～30份,所述复合膨胀剂为蓝晶石、红柱石、石英砂中的两种或三种的混合物；所述结合剂为粒径5～100nm的硅溶胶。本发明高炉灌浆料具有强度高、流动性好、密封性好、寿命长等特点。(The invention discloses a blast furnace grouting material for sealing a gap at the back of a cooling wall of a blast furnace body, and relates to the technical field of grouting material processing. The refractory grouting material comprises the following raw materials in parts by weight: 70-95 parts of bauxite, 1-8 parts of silicon micro powder, 0-5 parts of a curing agent, 1-8 parts of a composite expanding agent, 0.1-0.5 part of a dispersing agent and 15-30 parts of a binding agent, wherein the composite expanding agent is a mixture of two or three of kyanite, andalusite and quartz sand; the binding agent is silica sol with the particle size of 5-100 nm. The blast furnace grouting material has the characteristics of high strength, good fluidity, good sealing property, long service life and the like.)

1. The utility model provides a sealed blast furnace grout material that uses of blast furnace shaft stave back gap which characterized in that: the composite material comprises the following raw materials in parts by mass:

70-95 parts of bauxite, 1-8 parts of silicon powder, 0-5 parts of a curing agent, 1-8 parts of a composite expanding agent, 0.1-0.5 part of a dispersing agent and 15-30 parts of a bonding agent;

the curing agent is one or more of calcium aluminate cement, sodium fluosilicate and magnesium oxide;

the composite expanding agent is a mixture of two or three of kyanite, andalusite and quartz sand.

2. The blast furnace grouting material for sealing the gap at the back of the cooling wall of the blast furnace shell according to claim 1, wherein Al in the alumina is contained in the blast furnace grouting material₂O₃The content is not less than 70 wt.%.

3. The blast furnace grouting material for sealing the gap at the back of the cooling wall of the blast furnace shaft as claimed in claim 1, wherein the average particle size of the fine silicon powder is 0.8 μm, wherein SiO is₂The content is not lower than 92 wt.%.

4. The blast furnace grouting material for sealing the gap at the back of the cooling wall of the blast furnace shaft according to claim 1, wherein the kyanite particle size is 0-0.4 mm, the andalusite particle size is 0-0.4 mm, and the quartz sand particle size is 200 meshes.

5. The blast furnace grouting material for sealing the gap at the back of the cooling wall of the blast furnace shaft according to claim 1, wherein the dispersant is sodium tripolyphosphate or sodium hexametaphosphate with the particle size of less than 1 mm.

6. The blast furnace grouting material for sealing the gap on the back of the cooling wall of the blast furnace shaft according to claim 1, wherein the binder is silica sol with a particle size of 5-100 nm.

7. The preparation method of the blast furnace grouting material for sealing the gap at the back of the cooling wall of the blast furnace body according to any one of claims 1 to 6, characterized by weighing alumina, silicon micropowder, a curing agent, a composite expanding agent and a dispersing agent in proportion, adding the weighed materials into a stirrer for dry mixing and stirring for 1 to 2min, then adding a bonding agent for stirring for 3 to 5min, uniformly stirring, placing the materials into a mold, and sequentially vibrating, curing and baking to obtain the blast furnace grouting material for sealing the gap at the back of the cooling wall of the blast furnace body.

Technical Field

The invention relates to the technical field of grouting material processing, in particular to a blast furnace grouting material for sealing a gap at the back of a cooling wall of a blast furnace body.

Background

At present, with the increasing popularity of blast furnace high air pressure, high air temperature and high oxygen enrichment operation, the smelting intensity is gradually increased, and the blast furnace has the problems of furnace shell red heat, cooling plate (cooling wall) burning loss, furnace shell cracking, furnace shell burning-through and the like. After the blast furnace is produced for a period of time, due to factors such as construction quality, material performance, production operation and the like, the problems can be generated in different degrees, so that the working environment of the blast furnace is deteriorated, potential safety hazards are caused, and the normal production and the service life of the blast furnace are directly influenced in severe cases. The grouting maintenance of the blast furnace can avoid the problems, is efficient and quick, ensures the normal and safe production of the blast furnace, and prolongs the service life of the blast furnace.

Disclosure of Invention

Based on the background, the invention provides a blast furnace grouting material for sealing a gap at the back of a cooling wall of a blast furnace body. The main raw materials are high-alumina bauxite particles and silica powder with large specific surface area and strong surface activity, and the high-temperature performance of the grouting material is improved while the fluidity of the grouting material is increased by combining the high-alumina bauxite particles and the silica powder through silica sol, so that the service life of a blast furnace is prolonged.

The blast furnace grouting material for sealing the gap at the back of the cooling wall of the blast furnace body comprises the following raw materials in parts by weight:

70-95 parts of bauxite, 1-8 parts of silicon powder, 0-5 parts of a curing agent, 1-8 parts of a composite expanding agent, 0.1-0.5 part of a dispersing agent and 15-30 parts of a bonding agent;

the curing agent is one or more of calcium aluminate cement, sodium fluosilicate and magnesium oxide;

the composite expanding agent is a mixture of two or three of kyanite, andalusite and quartz sand;

in some embodiments, the bauxite of the present invention contains Al₂O₃The content is not less than 70 wt.%.

In some embodiments, the fine silica powder of the present invention has an average particle size of 0.8 μm, wherein SiO₂The content is not lower than 92 wt.%.

In some embodiments, the kyanite particle size is 0-0.4 mm, the andalusite particle size is 0-0.4 mm, and the quartz sand particle size is 200 meshes.

In some embodiments, the dispersant of the present invention is sodium tripolyphosphate or sodium hexametaphosphate with a particle size of less than 1 mm.

In some embodiments, the binder of the present invention is silica sol having a particle size of 5 to 100 nm.

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

the blast furnace grouting material for sealing the gap at the back of the cooling wall of the blast furnace body has the characteristics of novel and unique raw material selection, good fluidity, strong sealing property, high strength, excellent high-temperature performance and the like.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

A blast furnace grouting material for sealing a gap at the back of a cooling wall of a blast furnace body consists of raw materials in percentage by mass as listed in Table 1.

Table 1 example 1 raw material composition of blast furnace grouting material

The preparation method comprises the following steps: weighing the above materials in proportion, adding into a stirrer, dry-mixing for 2min, adding silica sol, stirring for 3min, stirring uniformly, and placing into a mold to obtain a sample of 40 × 40 × 160 mm. And naturally curing the prepared sample for 24h, and then drying the sample at the temperature of 110 ℃/24h, and detecting the normal-temperature performance index. And (3) drying the sample, and detecting the high-temperature performance index of the sample after heat treatment at 1200 ℃/3h and 1000 ℃/3 h.

Example 2

A blast furnace grouting material for sealing a gap at the back of a cooling wall of a blast furnace body consists of raw materials in percentage by mass as listed in Table 2.

Table 2 example 2 raw material composition of blast furnace grouting material

The preparation method comprises the following steps: weighing the above materials in proportion, adding into a stirrer, dry-mixing for 2min, adding silica sol, stirring for 3min, stirring uniformly, and placing into a mold to obtain a sample of 40 × 40 × 160 mm. And naturally curing the prepared sample for 24h, and then drying the sample at the temperature of 110 ℃/24h, and detecting the normal-temperature performance index. And (3) drying the sample, and detecting the high-temperature performance index of the sample after heat treatment at 1200 ℃/3h and 1000 ℃/3 h.

Comparative example

A common blast furnace grouting material for sealing a gap at the back of a cooling wall of a blast furnace body is prepared from the raw materials shown in Table 3.

TABLE 3 raw material composition of comparative example blast furnace grouting material

The preparation method comprises the following steps: weighing the above materials in proportion, adding into a stirrer, dry-mixing for 2min, adding silica sol, stirring for 3min, stirring uniformly, and placing into a mold to obtain a sample of 40 × 40 × 160 mm. And naturally curing the prepared sample for 24h, and then drying the sample at the temperature of 110 ℃/24h, and detecting the normal-temperature performance index. And (3) drying the sample, and detecting the high-temperature performance index of the sample after heat treatment at 1200 ℃/3h and 1000 ℃/3 h.

The results of the normal temperature and high temperature tests of the samples prepared in examples 1 to 2 of the present invention and comparative example are shown in Table 4. The performance detection method adopted by the invention is carried out according to the current national standard or industry standard, and the obtained detection result is the average detection result of 3 times.

TABLE 4 blast furnace grouting material performance test results

The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.