阅读说明：本技术 一种耐火预制件用环保型浇注料及其制备方法 (Environment-friendly castable for refractory prefabricated member and preparation method thereof ) 是由 张晓波 刘丽 滕国强 牛春林 金秀明 王佳宁 颜浩 任林 于 2020-12-30 设计创作，主要内容包括：本发明公开了一种耐火预制件用环保型浇注料及其制备方法,所述耐火预制件用环保浇注料包含废弃的高铝质耐火材料、板状刚玉、白刚玉细粉、氧化铝微粉、二氧化硅微粉、纯铝酸钙水泥、耐热钢纤维、添加剂和外加剂,通过调整上述原料配比,经过除杂、破碎、除铁处理、筛分、配料和干混工序制备环保型浇注料。本发明环保型浇注料性能优良,可以用于电弧炉的炉顶预制件和精炼炉的炉盖等高铝质耐火预制制品中,其充分利用废旧耐火材料,降低了产品成本,节约原料资源,同时也降低了废弃耐火材料对环境的影响程度,同时制备工艺简单,产品成品率高。(The invention discloses an environment-friendly castable for a refractory prefabricated member and a preparation method thereof, wherein the environment-friendly castable for the refractory prefabricated member comprises waste high-alumina refractory material, tabular corundum, white corundum fine powder, alumina micro powder, silica micro powder, pure calcium aluminate cement, heat-resistant steel fiber, an additive and an additive, and is prepared by adjusting the proportion of the raw materials, and performing the procedures of impurity removal, crushing, iron removal treatment, screening, batching and dry mixing. The environment-friendly castable disclosed by the invention is excellent in performance, can be used for high-aluminum refractory prefabricated products such as furnace top prefabricated members of electric arc furnaces and furnace covers of refining furnaces, fully utilizes waste refractory materials, reduces the product cost, saves raw material resources, reduces the influence degree of the waste refractory materials on the environment, and is simple in preparation process and high in product yield.)

1. The environment-friendly castable for the refractory prefabricated member is characterized by comprising the following raw materials in parts by weight:

15-25 parts of waste high-alumina refractory, 40-70 parts of tabular corundum, 10-25 parts of white corundum fine powder, 3-6 parts of alumina micro powder, 1-3 parts of silica micro powder, 3-6 parts of pure calcium aluminate cement, 1-3 parts of heat-resistant steel fiber, 0.1-0.4 part of additive and 0.1-0.2 part of additive.

2. The environment-friendly castable for refractory preforms as claimed in claim 1, wherein the waste high-alumina refractory is waste high-alumina refractory after use, has a particle size of 8-25 mm, and has Al content₂O₃The content is more than or equal to 70 wt%.

3. The environment-friendly castable for refractory preforms according to claim 1, wherein the tabular corundum is composed of tabular corundum with particle sizes of 0-1 mm, 1-3 mm, 3-5 mm and 5-8 mm in a weight ratio of 2-5: 4-6: 2-4: 1-3.

4. The environment-friendly castable for the refractory preform according to claim 1, wherein the white corundum fine powder consists of white corundum fine powder with a particle size of 200 meshes and 325 meshes in a mass ratio of 1-2: 1.

5. The environment-friendly castable for the refractory preform according to claim 1, wherein the alumina micropowder consists of activated alumina with particle sizes of 1 μm and 3 μm in a mass ratio of 1-2: 1.

6. The environment-friendly castable for refractory precast members according to claim 1, wherein the silica micropowder consists of ordinary silica micropowder and zirconium-containing silica micropowder in a mass ratio of 1-2: 1.

7. The environment-friendly castable for refractory preforms as claimed in claim 6, wherein the purity of the ordinary silica micropowder is greater than 92%, the zirconium content in the zirconium-containing silica micropowder is 2-4%, and the silica content is greater than 94%.

8. The environment-friendly castable for refractory preforms according to claim 1, wherein the refractory steel fibers consist of 446# steel fibers and 304# steel fibers in any mass ratio.

9. The environment-friendly castable for refractory preforms as claimed in claim 1, wherein the additive is composed of sodium tripolyphosphate, sodium hexametaphosphate and sodium citrate in any mass ratio; the additive is composed of polypropylene explosion-proof fibers and 200-mesh metal aluminum powder according to the weight ratio of 5-10: 1.

10. The method for preparing the environment-friendly castable for refractory preforms according to any one of claims 1-9, characterized by comprising the steps of:

(1) removing impurities from the waste high-alumina refractory material to remove impurities attached to the surface;

(2) crushing: sorting the high-alumina refractory material after impurity removal, and crushing after sorting;

(3) iron removal treatment: removing iron from the crushed high-alumina refractory material by using an iron remover;

(4) screening: sieving the high-alumina refractory material subjected to iron removal, wherein the sieved high-alumina refractory material is 8-20 mm in particle size for later use;

(5) preparing materials: mixing the raw materials in proportion;

(6) dry mixing: and uniformly mixing the obtained ingredients in a forced stirrer to obtain the environment-friendly castable.

Technical Field

The invention relates to the technical field of refractory materials, in particular to an environment-friendly castable for a refractory prefabricated member, which is suitable for high-aluminum refractory prefabricated products such as a furnace top prefabricated member of an electric arc furnace, a furnace cover of an LF refining furnace and the like.

Background

The refractory material is an inorganic non-metallic material with refractoriness of not less than 1580 ℃, is widely applied to the industrial fields of metallurgy, chemical industry, petroleum, mechanical manufacturing, silicate, power and the like, and has the largest use amount in the steel and iron control industry, and accounts for 50% -60% of the total output.

With the rapid increase of the steel yield in China, the consumption of the refractory materials is greatly increased, the refractory materials as consumable materials have a life cycle, and usually need to be updated in time when the life cycle is reached, most of waste refractory materials can be generated along with the updating, wherein the proportion of the waste refractory materials reaches 45% of the total consumption of the refractory materials, and the existing treatment mode of the waste refractory materials is still buried as industrial garbage, but most of the waste refractory materials can be recycled. If the waste refractory materials which can be recycled are not fully utilized, the waste refractory materials can be treated as garbage, so that the waste of raw material resources is caused, the treatment cost is increased, and the environment is polluted by the stored refractory materials after use.

Disclosure of Invention

Based on the problems, the invention aims to provide the environment-friendly castable for the refractory prefabricated member and the preparation method thereof, which fully utilize a large amount of waste refractory materials, reduce the cost of raw materials and simultaneously produce the castable with excellent performance.

The environment-friendly castable for the refractory prefabricated member is characterized by comprising the following raw materials in parts by weight:

15-25 parts of waste high-alumina refractory, 40-70 parts of tabular corundum, 10-25 parts of white corundum fine powder, 3-6 parts of alumina micro powder, 1-3 parts of silica micro powder, 3-6 parts of pure calcium aluminate cement, 1-3 parts of heat-resistant steel fiber, 0.1-0.4 part of additive and 0.1-0.2 part of additive.

Preferably, the waste high aluminumThe refractory material is a waste high-alumina refractory material, the grain diameter of the refractory material is 8-25 mm, and the Al of the refractory material is Al₂O₃The content is more than or equal to 70 wt%.

Preferably, the plate-shaped corundum consists of plate-shaped corundum with the granularity of 0-1 mm, 1-3 mm, 3-5 mm and 5-8 mm according to the weight ratio of 2-5: 4-6: 2-4: 1-3.

Preferably, the white corundum fine powder consists of white corundum fine powder with the particle size of 200 meshes and 325 meshes according to the mass ratio of 1-2: 1.

Preferably, the alumina micro powder consists of activated alumina with the particle size of 1 μm and 3 μm according to the mass ratio of 1-2: 1.

Preferably, the silicon dioxide micro powder is composed of ordinary silicon dioxide micro powder and zirconium-containing silicon micro powder according to the mass ratio of 1-2: 1.

Preferably, the purity of the common silicon dioxide micro powder is more than 92%, the zirconium content in the zirconium-containing silicon micro powder is 2-4%, and the silicon dioxide content is more than 94%.

Preferably, the heat-resistant steel fibers are formed by 446# steel fibers and 304# steel fibers in any mass ratio.

Preferably, the additive is composed of sodium tripolyphosphate, sodium hexametaphosphate and sodium citrate according to any weight ratio; the additive is composed of polypropylene explosion-proof fibers and 200-mesh metal aluminum powder according to the mass ratio of 5-10: 1.

Preferably, the preparation method of the environment-friendly castable for the refractory precast member is characterized by comprising the following steps of:

(1) removing impurities from the waste high-alumina refractory material to remove impurities attached to the surface;

(2) crushing: sorting the high-alumina refractory material after impurity removal, and crushing after sorting;

(3) iron removal treatment: removing iron from the crushed high-alumina refractory material by using an iron remover;

(4) screening: sieving the high-alumina refractory material subjected to iron removal, wherein the sieved high-alumina refractory material is 8-20 mm in particle size for later use;

(5) preparing materials: mixing the raw materials in proportion;

(6) dry mixing: and uniformly mixing the obtained ingredients in a forced stirrer to obtain the environment-friendly castable.

Compared with the prior art, the invention has the following beneficial effects: the invention processes the waste high-alumina used refractory material by a reasonable process and then applies the treated refractory material to the refractory prefabricated product again, so that the waste refractory material can be reused, the resources are saved, and the environmental pollution is reduced.

Detailed Description

The present invention will be further described with reference to the following specific examples.

Example 1

An environment-friendly castable for refractory prefabricated members is composed of the following raw materials in parts by weight:

20 parts of waste high-alumina refractory material, 45 parts of tabular corundum, 25 parts of white corundum fine powder, 4 parts of alumina micro powder, 2 parts of silica micro powder, 5 parts of pure calcium aluminate cement, 2 parts of heat-resistant steel fiber, 0.2 part of additive and 0.2 part of additive.

The waste high-alumina refractory material is a waste high-alumina refractory material after use, the particle size of the waste high-alumina refractory material is 8-25 mm, and Al of the waste high-alumina refractory material is Al₂O₃The content of the tabular corundum is more than or equal to 70 wt%, the tabular corundum is composed of tabular corundum with the granularity of 0-1 mm, 1-3 mm, 3-5 mm and 5-8 mm according to the weight ratio of 4:5:3:2, the white corundum fine powder is composed of white corundum fine powder with the granularity of 200 meshes and 325 meshes according to the mass ratio of 2:1, the alumina micro powder is composed of active alumina with the granularity of 1 mu m and 3 mu m according to the mass ratio of 1:1, the silica micro powder is composed of common silica micro powder and zirconium-containing silica micro powder according to the mass ratio of 1:1, the purity of the common silica micro powder is more than 92%, the zirconium content in the zirconium-containing silica micro powder is 2-4%, the silica content is more than 94%, the heat-resistant steel fiber is composed of 446# steel fiber and 304# steel fiber according to any mass ratio, the additive is composed of sodium tripolyphosphate, sodium hexametaphosphate and sodium citrate according to any weight ratio, the additive is composed of polypropylene explosion-proof fibers and 200-mesh metal aluminum powder according to the mass ratio of 10:1, and the experimental results are shown in Table 1.

Example 2

An environment-friendly castable for refractory prefabricated members is composed of the following raw materials in parts by weight:

25 parts of used high-alumina refractory material, 40 parts of tabular corundum, 25 parts of white corundum fine powder, 4 parts of alumina micro powder, 2 parts of silica micro powder, 5 parts of pure calcium aluminate cement, 2 parts of heat-resistant steel fiber, 0.2 part of additive and 0.2 part of additive.

The waste high-alumina refractory material is a waste high-alumina refractory material after use, the particle size of the waste high-alumina refractory material is 8-25 mm, and Al of the waste high-alumina refractory material is Al₂O₃The content of the tabular corundum is more than or equal to 70 wt%, the tabular corundum is composed of tabular corundum with the granularity of 0-1 mm, 1-3 mm, 3-5 mm and 5-8 mm according to the weight ratio of 4:5:3:2, the white corundum fine powder is composed of white corundum fine powder with the granularity of 200 meshes and 325 meshes according to the mass ratio of 2:1, the alumina micro powder is composed of active alumina with the granularity of 1 mu m and 3 mu m according to the mass ratio of 2:1, the silica micro powder is composed of common silica micro powder and zirconium-containing silica micro powder according to the mass ratio of 2:1, the purity of the common silica micro powder is more than 92%, the zirconium content in the zirconium-containing silica micro powder is 2-4%, the silica content is more than 94%, the heat-resistant steel fiber is composed of 446# steel fiber and 304# steel fiber according to any mass ratio, the additive is composed of sodium tripolyphosphate, sodium hexametaphosphate and sodium citrate according to any weight ratio, the additive is composed of polypropylene explosion-proof fibers and 200-mesh metal aluminum powder according to the mass ratio of 5:1, and the experimental results are shown in Table 1.

Example 3

An environment-friendly castable for refractory prefabricated members is composed of the following raw materials in parts by weight:

15 parts of used high-alumina refractory material, 50 parts of tabular corundum, 25 parts of white corundum fine powder, 4 parts of alumina micro powder, 2 parts of silica micro powder, 5 parts of pure calcium aluminate cement, 2 parts of heat-resistant steel fiber, 0.2 part of additive and 0.2 part of additive.

The waste high-alumina refractory material is a waste high-alumina refractory material after use, the particle size of the waste high-alumina refractory material is 8-25 mm, and Al of the waste high-alumina refractory material is Al₂O₃The content is more than or equal to 70 wt%, and the plate-shaped corundum is prepared from plate-shaped corundum with the granularity of 0-1 mm, 1-3 mm, 3-5 mm and 5-8 mm according to the weight ratio of 4:5:3:2The high-purity white corundum fiber comprises white corundum fine powder with the particle sizes of 200 meshes and 325 meshes according to a mass ratio of 2:1, wherein the alumina micro powder comprises active alumina with the particle sizes of 1 mu m and 3 mu m according to a mass ratio of 1:1, the silica micro powder comprises common silica micro powder and zirconium-containing silica micro powder according to a mass ratio of 1:1, the purity of the common silica micro powder is more than 92%, the zirconium content in the zirconium-containing silica micro powder is 2-4%, the silica content is more than 94%, the heat-resistant steel fiber comprises 446# steel fiber and 304# steel fiber according to any mass ratio, the additive comprises sodium tripolyphosphate, sodium hexametaphosphate and sodium citrate according to any weight ratio, the additive comprises polypropylene explosion-proof fiber and 200-mesh metal aluminum powder according to a mass ratio of 10:1, and the experimental result is shown in table 1.

Example 4

An environment-friendly castable for refractory prefabricated members is composed of the following raw materials in parts by weight:

15 parts of used high-alumina refractory material, 50 parts of tabular corundum, 25 parts of white corundum fine powder, 6 parts of alumina micro powder, 3 parts of silica micro powder, 6 parts of pure calcium aluminate cement, 3 parts of heat-resistant steel fiber, 0.2 part of additive and 0.2 part of additive.

The waste high-alumina refractory material is a waste high-alumina refractory material after use, the particle size of the waste high-alumina refractory material is 8-25 mm, and Al of the waste high-alumina refractory material is Al₂O₃The content of the tabular corundum is more than or equal to 70 wt%, the tabular corundum is composed of tabular corundum with the granularity of 0-1 mm, 1-3 mm, 3-5 mm and 5-8 mm according to the weight ratio of 4:5:3:2, the white corundum fine powder is composed of white corundum fine powder with the granularity of 200 meshes and 325 meshes according to the mass ratio of 2:1, the alumina micro powder is composed of active alumina with the granularity of 1 mu m and 3 mu m according to the mass ratio of 1:1, the silica micro powder is composed of common silica micro powder and zirconium-containing silica micro powder according to the mass ratio of 1:1, the purity of the common silica micro powder is more than 92%, the zirconium content in the zirconium-containing silica micro powder is 2-4%, the silica content is more than 94%, the heat-resistant steel fiber is composed of 446# steel fiber and 304# steel fiber according to any mass ratio, the additive is composed of sodium tripolyphosphate, sodium hexametaphosphate and sodium citrate according to any weight ratio, the additive is prepared from polypropylene explosion-proof fiber and 200 meshesThe metal aluminum powder is composed according to the mass ratio of 10:1, and the experimental result is shown in Table 1.

The preparation method of the environment-friendly castable for the refractory prefabricated member in the embodiment 1-4 comprises the following steps:

(1) removing impurities from the waste high-alumina refractory material to remove impurities attached to the surface;

(2) crushing: sorting the high-alumina refractory material after impurity removal, and crushing after sorting;

(3) iron removal treatment: removing iron from the crushed high-alumina refractory material by using an iron remover;

(4) screening: sieving the high-alumina refractory material subjected to iron removal, wherein the sieved high-alumina refractory material is 8-20 mm in particle size for later use;

(5) preparing materials: mixing the raw materials in proportion;

(6) dry mixing: and uniformly mixing the obtained ingredients in a forced stirrer to obtain the environment-friendly castable.

TABLE 1

Index (I)	Example 1	Example 2	Example 3	Example 4
					Bulk Density (g/cm)3)	3.15	3.13	3.16	3.16
Normal temperature compressive strength (MPa)	75.2	72.3	75.5	78.6
					Normal temperature rupture strength (MPa)	11.1	10.2	12.5	13.5
Cost per ton is reduced (Yuan/ton)	400	500	300	300

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.