阅读说明：本技术 铝镁质无水炮泥 (Aluminum-magnesium anhydrous stemming ) 是由 丁丰收 李旭柯 晁尚奎 李培焱 于 2020-06-05 设计创作，主要内容包括：本发明公开了一种铝镁质无水炮泥,是由回收铁水沟浇注料、回收滑板、再生刚玉粉、再生镁砂以及成品原料焦炭粒、叶蜡石、氮化硅铁、高温沥青粉、镁质粘土粉和混合油结合剂按一定重量份配比配制而成。本发明根据铝镁质无水炮泥的材质和特性,较大比例采用相近材质的回收及再生耐火材料取代了原生耐火材料,充分利用了用后回收及再生耐火原料,不但节约了宝贵资源,降低了无水炮泥原材料成本,销售价格降为3500元/吨,同时也减少了工业固废排放对于生态环境的破坏,符合国家资源循环利用政策。本发明配制的铝镁质无水炮泥经过炉前实际使用,实际应用的效果达到并超过了原生耐火原料制作的无水炮泥产品。(The invention discloses an aluminum-magnesium anhydrous stemming which is prepared from recycled iron runner castable, recycled sliding plates, recycled corundum powder, recycled magnesia, finished coke particles, pyrophyllite, ferrosilicon nitride, high-temperature asphalt powder, magnesium clay powder and a mixed oil binder in a certain weight part ratio. According to the material and the characteristics of the aluminum-magnesium anhydrous stemming, the recycled and regenerated refractory material with similar material is adopted to replace the original refractory material in a larger proportion, and the recycled and regenerated refractory material after use is fully utilized, so that not only are precious resources saved, but also the raw material cost of the anhydrous stemming is reduced, the selling price is reduced to 3500 Yuan/ton, and meanwhile, the damage of industrial solid waste discharge to the ecological environment is reduced, and the method conforms to the national resource recycling policy. The aluminum-magnesium anhydrous stemming prepared by the invention is actually used before the furnace, and the actual application effect reaches and exceeds the anhydrous stemming product prepared from the original refractory raw material.)

1. The aluminum-magnesium anhydrous stemming is characterized in that: the composite material is prepared from recycled iron runner castable, recycled sliding plates, recycled corundum powder, recycled magnesia, finished coke particles, pyrophyllite, ferrosilicon nitride, high-temperature asphalt powder, magnesium clay powder and a mixed oil binder according to the following weight parts:

10-25 parts of recycled iron runner castable with the granularity of 0-4 mm;

4-8 parts of a recovery sliding plate with the granularity of 0-1 mm;

5-15 parts of 200-mesh regenerated corundum powder;

20-40 parts of regenerated magnesia, 10-25 parts of 1-4 mm granular materials and 10-15 parts of 200-mesh powder materials;

7-12 parts of coke particles with the particle size of 0-3 mm;

0-13 parts of pyrophyllite with the particle size of 0-1 mm;

8-12 parts of ferrosilicon nitride;

2-5 parts of high-temperature asphalt powder;

8-11 parts of 200-mesh magnesium clay powder;

16-20% of mixed oil binder per total amount of materials.

2. The aluminum-magnesium anhydrous stemming according to claim 1, wherein: recovering Al in the molten iron runner castable₂O₃Not less than 55 percent, not less than 3 percent of C, and not more than 2.5 percent of Fe2O 3; recovering Al in the sliding plate₂O₃≥55%，C≥6%。

3. The aluminum-magnesium anhydrous stemming according to claim 1, wherein: al in the regenerated corundum powder₂O₃More than or equal to 90 percent; MgO in the regenerated magnesia is more than or equal to 90 percent.

4. The aluminum-magnesium anhydrous stemming according to claim 1, wherein: the fixed carbon in the coke particles is more than or equal to 80 percent, and the water content is less than or equal to 3 percent.

5. The aluminum-magnesium anhydrous stemming according to claim 1, wherein: al in the pyrophyllite₂O₃≥14%，SiO₂More than or equal to 68 percent and less than or equal to 3 percent of water.

6. The aluminum-magnesium anhydrous stemming according to claim 1, wherein: the silicon iron nitride contains 45-50% of Si, 14-17% of Fe and 25-35% of N.

7. The aluminum-magnesium anhydrous stemming according to claim 1, wherein: the softening point of the high-temperature asphalt powder is more than or equal to 125 ℃, the fixed carbon is more than or equal to 58 percent, and the ash content is less than or equal to 0.6 percent.

8. The aluminum-magnesium anhydrous stemming according to claim 1, wherein: the MgO in the magnesium clay powder is more than or equal to 20 percent, and the water content is less than or equal to 3 percent.

9. The aluminum-magnesium anhydrous stemming according to claim 1, wherein: the mixed oil binder is prepared from 0.8-0.95 part by weight of coal tar and 0.05-0.2 part by weight of anthracene oil.

Technical Field

The invention relates to a refractory material, in particular to an aluminum-magnesium anhydrous stemming.

Background

The slag iron outlet is an important component of an ore-smelting electric furnace or a blast furnace for smelting iron alloy and is a necessary channel for smelting products to flow out of a furnace body. The anhydrous stemming is a special refractory material for plugging the slag iron outlet and plays a role in opening and closing a slag iron outlet channel. In order to ensure the plugging effect, the anhydrous stemming product is required to have the performances of easy mud pumping, tight plugging, stable mud bag, easy opening, stable taphole depth, no moist mud, scouring resistance, erosion resistance, long tapping time and the like, and simultaneously has the functions of effectively protecting the taphole area of the furnace hearth, stabilizing the tapping operation and improving the yield of molten iron. At present, the anhydrous stemming of an ore-smelting electric furnace or a blast furnace slag iron notch for smelting iron alloy generally adopts magnesium or aluminum magnesium materials, such as heavy-burned magnesia, light-burned magnesia powder, high-aluminum bauxite powder, graphite, coke particles and other primary refractory materials, the cost of raw materials is higher, the sale price of the finished product stemming is 4000 yuan/ton, and the consumption of the anhydrous stemming is very high due to frequent opening and closing operations of the slag iron notch, so that the production cost is higher.

The used refractory materials are reasonably recycled, so that the consumption of the raw materials can be greatly reduced, and the damage of industrial solid wastes to the ecological environment can be reduced. At present, research on used refractory materials is carried out in various countries in the world, the recovery rate of the refractory materials of foreign steel mills reaches 80%, and the recovery rate of the used refractory materials in China is only about 30% and is far lower than that in developed countries.

The recycling of the iron runner castable and the recycling of the sliding plate are common solid wastes in the smelting industry, the recycled corundum powder and the recycled magnesia are recyclable resources, and if the recycled corundum powder and the recycled magnesia can be used as raw materials of the anhydrous stemming, the raw material cost of the anhydrous stemming can be greatly reduced.

Disclosure of Invention

The invention aims to provide an aluminum-magnesium anhydrous stemming prepared by using a used refractory and a regeneration raw material as raw materials, which not only reduces the raw material cost of the anhydrous stemming, but also reduces the damage of industrial solid waste discharge to the ecological environment.

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

the aluminum-magnesium anhydrous stemming is prepared from recycled iron runner castable, recycled sliding plates, recycled corundum powder, recycled magnesia, finished raw materials of coke particles, pyrophyllite, ferrosilicon nitride, high-temperature asphalt powder, magnesium clay powder and a mixed oil binder according to the following weight part ratio:

10-25 parts of recycled iron runner castable with the granularity of 0-4 mm;

4-8 parts of a recovery sliding plate with the granularity of 0-1 mm;

5-15 parts of 200-mesh regenerated corundum powder;

20-40 parts of regenerated magnesia, 10-25 parts of 1-4 mm granular materials and 10-15 parts of 200-mesh powder materials;

7-12 parts of coke particles with the particle size of 0-3 mm;

0-13 parts of pyrophyllite with the particle size of 0-1 mm;

8-12 parts of ferrosilicon nitride;

2-5 parts of high-temperature asphalt powder;

8-11 parts of 200-mesh magnesium clay powder;

the mixed oil binder is added according to 16-20% of the total amount of the materials.

In order to ensure that the prepared anhydrous stemming film meets the use requirements, the quality requirements of the reclaimed materials, the regenerated materials and the finished product raw materials are as follows:

the invention uses Al in the recycled molten iron runner castable₂O₃Not less than 55 percent, not less than 3 percent of C, and not more than 2.5 percent of Fe2O 3; recovering Al in the sliding plate₂O₃≥55%，C≥6%。

Al in the regenerated corundum powder used in the invention₂O₃More than or equal to 90 percent; MgO in the regenerated magnesia is more than or equal to 90 percent.

The fixed carbon in the coke particles used in the invention is more than or equal to 80 percent, and the water content is less than or equal to 3 percent.

Al in pyrophyllite used in the present invention₂O₃≥14%，SiO₂More than or equal to 68 percent and less than or equal to 3 percent of water.

The silicon iron nitride used in the invention contains 45-50% of Si, 14-17% of Fe and 25-35% of N.

The softening point of the high-temperature asphalt powder used in the invention is more than or equal to 125 ℃, the fixed carbon is more than or equal to 58 percent, and the ash content is less than or equal to 0.6 percent.

The magnesium clay powder used in the invention contains more than or equal to 20 percent of MgO and less than or equal to 3 percent of water.

The mixed oil binder used in the invention is prepared from coal tar and anthracene oil according to the weight ratio of 0.8-0.95: 0.05-0.2.

Firstly, respectively carrying out component detection on the recycled molten iron runner castable and the recycled sliding plate, after the use requirements are met, sorting and removing impurities, and crushing the materials into granular materials meeting the requirements; accurately weighing the regenerated raw materials and the finished raw materials respectively, putting the materials, the regenerated raw materials and the finished raw materials into a mixing mill, mixing, milling and stirring, adding the mixed oil binding agent, fully and uniformly mixing, forming by a mud extruder to obtain finished products, and wrapping single blocks by plastic films respectively and then warehousing.

The invention has the advantages that according to the material and the characteristics of the aluminum-magnesium anhydrous stemming, the recovered and regenerated refractory material with similar material is adopted to replace the original refractory material in a larger proportion, the used recovered and regenerated refractory material is fully utilized, not only precious resources are saved, the raw material cost of the anhydrous stemming is reduced, the selling price is reduced to 3500 Yuan/ton, but also the damage of industrial solid waste discharge to the ecological environment is reduced, and the national resource recycling policy is met.

The aluminum-magnesium anhydrous stemming prepared by the invention can meet the performances of easy stemming, tight plugging, stable mud covering, easy opening, stable iron notch depth, no wet mud, scouring resistance, erosion resistance, long tapping time and the like of the anhydrous stemming after being actually used in front of a furnace, can effectively protect the tapping hole area of a furnace hearth, stabilize tapping operation and improve the yield of molten iron, and the actually applied effect reaches and exceeds that of an anhydrous stemming product prepared from a primary refractory raw material.

Detailed Description

The present invention is described in more detail below with reference to specific examples to facilitate understanding for those skilled in the art.

The recycled refractory used in the invention comprises recycled iron runner castable and recycled sliding plates which are used as solid waste refractory in the industry, and the recycled refractory can be used only after meeting the component requirements by firstly carrying out component detection when in use; the used regenerated corundum powder and regenerated magnesite are bought lump materials, are subjected to magnetic separation after being coarsely broken, and are processed into required granular materials or powder materials; the coke particles, pyrophyllite, ferrosilicon nitride, high-temperature asphalt powder, magnesium clay powder and coal tar and anthracene oil for preparing the mixed oil binder are all commercially available products.

The invention is illustrated in the following table 1 by way of three formulation examples:

TABLE 1

The anhydrous stemming of the 1-3 # finished products is detected, and the physicochemical indexes are as follows:

TABLE 2

The various index ranges of the conventional stemming products are as follows: al (Al)₂O₃12-25% of the total weight of the composition, 15-35% of MgO, 12-18% of SiC + C, and 1.8-2.0 g/cm of the density³And the strength is 6-12 MPa.

As can be seen from the data in Table 2, the aluminum-magnesium anhydrous stemming prepared by the invention can completely meet the use requirements of a taphole of an ore-smelting electric furnace or a blast furnace for smelting iron alloy.

Because the variety of slag for smelting iron alloy has complex components, the addition proportion of the used raw materials can be adjusted according to the slag system of a user (within the range disclosed by the invention) during actual preparation, so that the chemical components of the finished stemming meet the requirements of smelting process.