阅读说明：本技术 一种环保型冒口保温剂及其制备方法 (Environment-friendly riser heat-insulating agent and preparation method thereof ) 是由 段继东 迟连功 于 2021-09-10 设计创作，主要内容包括：本申请公开了一种环保型冒口保温剂及其制备方法,属于铸造辅料技术领域。其中,一种环保型冒口保温剂,包括以下重量份数的成分：硅藻土20～40份、膨胀珍珠岩10～30份和莫来石粉40～60份。该冒口保温剂保温效果好,在使用过程中没有烟雾产生,改善操作环境,实现绿色无污染生产,且制备方法简单、易操作,原料环保、价廉,降低了生产成本。(The application discloses an environment-friendly riser heat-insulating agent and a preparation method thereof, and belongs to the technical field of casting auxiliary materials. The environment-friendly riser heat-insulating agent comprises the following components in parts by weight: 20-40 parts of diatomite, 10-30 parts of expanded perlite and 40-60 parts of mullite powder. The riser heat-insulating agent has good heat-insulating effect, does not generate smoke in the using process, improves the operating environment, realizes green and pollution-free production, has simple preparation method, easy operation, environment-friendly and cheap raw materials, and reduces the production cost.)

1. The environment-friendly riser heat-insulating agent is characterized by comprising the following components in parts by weight: 20-40 parts of diatomite, 10-30 parts of expanded perlite and 40-60 parts of mullite powder.

2. The environment-friendly riser heat-insulating agent as claimed in claim 1, which comprises the following components in parts by weight: 40 parts of diatomite, 10 parts of expanded perlite and 50 parts of mullite powder.

3. The environment-friendly riser heat-insulating agent as claimed in claim 1, wherein the particle size of the mullite powder is 180-300 meshes.

4. The environment-friendly riser heat-insulating agent as claimed in claim 3, wherein the particle sizes of the expanded perlite and the diatomite are 250-400 meshes.

5. The environment-friendly riser heat-insulating agent as claimed in claim 4, wherein the mullite powder has a particle size of 200 meshes, the expanded perlite has a particle size of 300 meshes, and the diatomite has a particle size of 300 meshes.

6. The environment-friendly riser heat-insulating agent as claimed in claim 1, wherein the mullite powder comprises the following components in parts by weight: SiO 2₂40 to 55 parts of Al₂O₃42 to 52 parts of TiO₂1-3 parts.

7. The environment-friendly riser heat-insulating agent as claimed in claim 6, wherein the diatomite comprises the following components in parts by weight: SiO 2₂60 to 70 parts of Al₂O₃15-20 parts of Fe₂O₃2-6 parts.

8. The environment-friendly riser heat-insulating agent as claimed in claim 7, wherein the expanded perlite comprises the following components in parts by weight: SiO 2₂60 to 80 parts of Al₂O₃10 to 18 parts of, K₂1 to 5 portions of O and Na₂And 1-5 parts of O.

9. The method of claim 8The environment-friendly riser heat-insulating agent is characterized in that the mullite powder comprises the following components in parts by weight: SiO 2₂48.53 parts of Al₂O₃47.35 parts of Fe₂O₃0.88 part of TiO₂2.03 parts, CaO 0.13 parts, K₂0.46 part of O, Na₂0.05 part of O;

the melting point of the mullite powder is 1810 ℃, and the volume density of the mullite powder is 3.16g/cm³The thermal conductivity is 1.519W/(m.K);

the diatomite comprises the following components in parts by weight: SiO 2₂64.5 parts of Al₂O₃18.76 parts of Fe₂O₃4.82 parts and 2.33 parts of CaO;

the diatomite has a melting point of 1280 deg.C and a volume density of 0.5g/cm³The thermal conductivity is 0.143W/(m.K);

the expanded perlite comprises the following components in parts by weight: SiO 2₂70.72 parts of Al₂O₃12.82 parts of Fe₂O₃2.17 parts, CaO 0.9 parts, K₂O3.54 parts, Na₂O3.58 parts;

the melting point of the expanded perlite is 1000 ℃, and the volume density of the expanded perlite is 40-200 g/cm³The thermal conductivity is 0.019-0.048W/(m.K).

10. The preparation method of the environment-friendly riser heat-insulating agent as claimed in any one of claims 1 to 9, comprising the following steps:

(1) adding 20-40 parts of diatomite, 10-30 parts of expanded perlite and 40-60 parts of mullite powder into a mixer, and uniformly stirring to obtain a mixture;

(2) and roasting the mixture at 180-250 ℃ for 3-5 h, and cooling to room temperature to obtain the environment-friendly riser heat-insulating agent.

Technical Field

The application relates to an environment-friendly riser heat-insulating agent and a preparation method thereof, belonging to the technical field of casting auxiliary materials.

Background

The riser heat preservation is used in the precision casting industry, and the common method is that a riser heat preservation agent is added at the riser position after casting in the casting process, and under the heat action of molten metal, an oxidant in the riser heat preservation agent provides oxygen to oxidize and heat a reducing agent, so that the solidification time of the molten metal in the riser is prolonged. Under the action of different heat insulating agents, the riser part is contracted into a dish-shaped flat bottom or a hemispherical bottom, namely the reducing mouth of the riser is approximately U-shaped. Obviously prolonging the top crusting time of the riser, enabling the molten steel in the riser to be under the action of atmospheric pressure for a long time, improving the feeding efficiency of the riser, being beneficial to floating up of gas and impurities in a casting, achieving the purpose of purifying the molten steel and further obtaining a qualified steel piece.

At present, a riser heat-insulating agent used in the actual production process generally comprises a heating agent, an oxidant, a combustion improver, a refractory filler, a heat-insulating material and the like. The exothermic agent is inflammable, high in calorific value and powdery, aluminum, magnesium, aluminum-magnesium alloy, ferrosilicon, silicon calcium and the like are generally selected as exothermic agent materials, and the exothermic agent materials are added at a riser during production, so that the exothermic agent is rapidly combusted, a large amount of smoke is generated, the operation environment of a site is influenced, and the requirement of green production is not met. In addition, the exothermic agent made of the above materials causes the price of the riser insulation agent to increase, and enterprises need to invest high cost when using the high-quality riser insulation agent. Based on the above, the invention designs a novel riser heat insulating agent to solve the above problems.

Disclosure of Invention

The invention aims to provide an environment-friendly riser heat-insulating agent and a preparation method thereof, the riser heat-insulating agent has a good heat-insulating effect, does not generate smoke in the using process, improves the operating environment, realizes green and pollution-free production, and has the advantages of simple preparation method, easiness in operation, environment-friendly and cheap raw materials and reduction in production cost.

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

an environment-friendly riser heat-insulating agent comprises the following components in parts by weight: 20-40 parts of diatomite, 10-30 parts of expanded perlite and 40-60 parts of mullite powder.

Preferably, the heat preservation agent comprises the following components in parts by weight: 40 parts of diatomite, 10 parts of expanded perlite and 50 parts of mullite powder.

Preferably, the particle size of the mullite powder is 180-300 meshes.

Preferably, the particle sizes of the expanded perlite and the diatomite are both 250-400 meshes.

Preferably, the particle size of the mullite powder is 200 meshes, the particle size of the expanded perlite is 300 meshes, and the particle size of the diatomite is 300 meshes.

Preferably, the mullite powder comprises the following components in parts by weight: SiO 2₂40 to 55 parts of Al₂O₃42 to 52 parts of TiO₂1-3 parts.

Preferably, the diatomite comprises the following components in parts by weight: SiO 2₂60 to 70 parts of Al₂O₃15-20 parts of Fe₂O₃2-6 parts.

Preferably, the expanded perlite comprises the following components in parts by weight: SiO 2₂60 to 80 parts of Al₂O₃10 to 18 parts of, K₂1 to 5 portions of O and Na₂And 1-5 parts of O.

Preferably, the mullite powder comprises the following components in parts by weight: SiO 2₂48.53 parts of Al₂O₃47.35 parts of Fe₂O₃0.88 part of TiO₂2.03 parts, CaO 0.13 parts, K₂0.46 part of O, Na₂0.05 part of O;

the melting point of the mullite powder is 1810 ℃, and the volume density of the mullite powder is 3.16g/cm³The thermal conductivity is 1.519W/(m.K);

the diatomite comprises the following components in parts by weight: SiO 2₂64.5 parts of Al₂O₃18.76 parts of Fe₂O₃4.82 parts and 2.33 parts of CaO;

the diatomite has a melting point of 1280 deg.C and a volume density of 0.5g/cm³The thermal conductivity is 0.143W/(m.K);

the expanded perlite comprises the following components in parts by weight: SiO 2₂70.72 parts of Al₂O₃12.82 parts of Fe₂O₃2.17 parts, CaO 0.9 parts, K₂O3.54 parts, Na₂O3.58 parts;

the melting point of the expanded perlite is 1000 ℃; the bulk density is 40-200 g/cm³More preferably 40 to 65g/cm³More preferably 50g/cm³(ii) a The thermal conductivity is 0.019-0.048W/(m.K), more preferably 0.019-0.024W/(m.K), and still more preferably 0.021W/(m.K).

The preparation method of the environment-friendly riser heat-insulating agent comprises the following specific steps:

(1) adding 20-40 parts of diatomite, 10-30 parts of expanded perlite and 40-60 parts of mullite powder into a mixer, and uniformly stirring to obtain a mixture;

(2) and roasting the mixture at 180-250 ℃ for 3-5 h, and cooling to room temperature to obtain the environment-friendly riser heat-insulating agent.

Preferably, the environment-friendly riser heat insulating agent is an off-white powdery material.

Benefits of the present application include, but are not limited to:

1. the environment-friendly riser heat-insulating agent has a good heat-insulating effect, and ensures sequential solidification of castings and effective feeding of molten steel; the environment-friendly riser heat-insulating agent has no smoke in the using process, improves the operating environment, realizes green and pollution-free production, and ensures physical and psychological health of workers; in addition, the raw materials of the heat preservation agent are environment-friendly and cheap, and the production cost is reduced.

2. The environment-friendly riser heat-insulating agent is simple in preparation method, strong in operability and convenient to process.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic view of a use process of the environment-friendly feeder insulation agent in embodiment 4 of the present application.

FIG. 2 is a schematic diagram showing the use of the feeder insulating agent of comparative example 5.

Fig. 3 is a schematic diagram illustrating a state of a riser after being cleaned by using the environment-friendly riser insulating agent according to embodiment 4 of the present application.

FIG. 4 is a schematic diagram showing a post-riser clearance condition using the inventive feeder insulating agent of comparative example 5.

Detailed Description

The present application will be described in detail with reference to examples, but the present application is not limited to these examples.

1. Preparation and performance evaluation of environment-friendly riser heat-insulating agent

The environment-friendly riser heat-insulating agent disclosed by the invention is explored through experiments, can form a heat-insulating layer at the riser position, prolongs the solidification time of liquid metal in the riser, and has good melting point, volume density and heat conductivity; the physical parameters of the ingredients involved in the various examples and comparative examples of the present invention are shown in table 1 below.

TABLE 1 physical parameters of insulating materials in examples 1 to 5 and comparative examples 1 to 5

TABLE 2 examples and comparative example insulating agent formulations

According to one aspect of the invention, the preparation method of the environment-friendly riser heat-insulating agent comprises the following specific steps:

(1) adding diatomite, expanded perlite and mullite powder into a mixer, and uniformly stirring to obtain a mixture;

(2) and roasting the mixture at 180-250 ℃ for 3-5 h, and cooling to room temperature to obtain the environment-friendly riser heat-insulating agent.

The preparation methods of the heat insulating agents of the above examples 1 to 5 and comparative examples 1 to 5 are the same as above.

According to another aspect of the present invention, test pieces of the same material, such as carbon steel, martensitic stainless steel, austenitic stainless steel, and carbon tool steel, are selected, the same process parameters are adopted before casting, the heat retaining agents of examples 1 to 5 and comparative examples 1 to 5 are respectively added to the riser position after casting, and the heat retaining agent of each example or comparative example tests 2 cast trees, and the results are shown in table 3:

TABLE 3 comprehensive Properties analysis of insulating agents of examples 1 to 5 and comparative examples 1 to 5

As can be seen from Table 3, the insulating agents of examples 3 and 5 have no smoke dust when used, are easy to use, and some produced products have shrinkage cavity defects and do not meet the use requirements. The heat insulating agents of the embodiments 1, 2 and 4 have no smoke dust when in use, are easy to use, produce products without shrinkage cavity defects, have the lowest cost of the heat insulating agent of the embodiment 4, and comprehensively consider to determine the heat insulating agent of the embodiment 4 as the best matching scheme. Compared with the embodiment 4, the heat insulating agent of the comparative example 1 and the comparative example 3 has higher cost, the heat insulating agent of the comparative example 2 generates smoke when in use, the high-purity aluminum silicate refractory fiber in the heat insulating agent of the comparative example 4 is floccule, and the addition amount is not easy to control when in use, so the heat insulating agent is not easy to use, and the heat insulating agent of the comparative example 5 generates smoke when in use, so the product quality is not good enough.

The feeder in the production process using the insulating agent of example 4 is shown in fig. 1, and no smoke is generated; the riser was cleaned as shown in figure 3 and was defect free.

The feeder in the production process using the insulating agent of comparative example 5 was as shown in FIG. 2, and smoke was generated; the riser state after cleaning is shown in fig. 4, and has shrinkage cavity defects.

2. Example 4 evaluation of Effect of environmental-friendly riser insulation agent on batch trial

The environment-friendly riser heat-insulating agent comprises 40 parts of diatomite, 10 parts of expanded perlite and 50 parts of mullite powder. The heat insulating agent is tested by batch production, smoke dust and peculiar smell are avoided in the using process, and the produced product has no shrinkage cavity defect and meets the requirement of batch use.

The production of more than 800 products in 1 year covers various materials such as high-temperature alloy, austenitic stainless steel, heat-resistant steel, carbon steel, low alloy steel and the like, and the products produced by the novel scheme have no obvious difference compared with the quality before use, thereby meeting the requirement of batch use.

The above description is only an example of the present application, and the protection scope of the present application is not limited by these specific examples, but is defined by the claims of the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the technical idea and principle of the present application should be included in the protection scope of the present application.