CN110615686A

CN110615686A - Cast iron ladle building process

Info

Publication number: CN110615686A
Application number: CN201910904745.3A
Authority: CN
Inventors: 柴知章; 王宜飞; 朱香全; 张星照
Original assignee: Anhui Institute of Information Engineering
Current assignee: Anhui Institute of Information Engineering
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2019-12-27

Abstract

The invention discloses a casting iron ladle building process, which comprises the following steps: s1, manufacturing an inner die; s2, manufacturing a refractory casting material; s3, pouring the ladle bottom of the ladle body by using a refractory pouring material; s4, filling the inner mold into the ladle body, and then pouring the ladle wall of the ladle body by using a refractory pouring material, wherein the ladle wall and the ladle bottom form a lining; s5, demolding; and S6, baking. The process for casting the foundry ladle of the cast iron ladle can prolong the service life of the ladle.

Description

Cast iron ladle building process

Technical Field

The invention belongs to the technical field of ladles, and particularly relates to a cast iron ladle building process.

Background

At present, the foundry ladle widely applied in the cast iron production industry of China mainly comprises a shell and a lining, wherein the shell is made of a steel plate with the thickness of 10mm, a layer of high-alumina bricks is built on the inner side of the shell, then a layer of refractory mortar is coated, and finally a layer of graphite paint is coated, so that the lining has short service life, and the general ladle age is 30-35 furnaces. The main reasons for the short service life are: firstly, the phenomenon of bag leakage occurs due to local burning through; secondly, along with the increase of tapping times, a large amount of iron slag is adhered to the bottom of the ladle, the slag is gradually melted to form impurities, and the impurities are poured into the cavity along with molten iron. A large amount of iron slag is adhered to the bottom of the ladle, so that the volume of the ladle becomes small, and the ladle is scrapped.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a casting ladle building process for a cast iron ladle, and aims to prolong the service life of the ladle.

In order to achieve the purpose, the invention adopts the technical scheme that: the cast iron ladle building process comprises the following steps:

s1, manufacturing an inner die;

s2, manufacturing a refractory casting material;

s3, pouring the ladle bottom of the ladle body by using a refractory pouring material;

s4, filling the inner mold into the ladle body, and then pouring the ladle wall of the ladle body by using a refractory pouring material, wherein the ladle wall and the ladle bottom form a lining;

s5, demolding;

and S6, baking.

In the step S1, an inner mold is manufactured according to the volume of the ladle, the inner mold is in a cone structure, and a release agent is coated on the surface of the inner mold.

In the step S2, the refractory castable comprises the following chemical components in percentage by mass: al (Al)₂O₃≥58％， SiO₂≥25％，SiC≥9％，Cr₂O₃≤2％，CaO≤1％。

In the step S2, the refractory castable comprises the following chemical components in percentage by mass: al (Al)₂O₃ 59％，SiO₂ 30％，SiC 9％，Cr₂O₃ 1％，CaO 1％。

In the step S2, the refractory castable comprises the following chemical components in percentage by mass: al (Al)₂O₃ 59％，SiO₂ 26％，SiC 13％，Cr₂O₃ 1％，CaO 1％。

In the step S2, the refractory castable comprises the following chemical components in percentage by mass: al (Al)₂O₃ 65％，SiO₂ 25％，SiC 10％。

The step S2 includes:

s201, weighing: weighing various materials according to the adjusted formula;

s202, dry mixing: mixing and stirring the materials uniformly;

s203, wet mixing: and (4) adding water to the dry mixed material, and wetting and stirring.

In step S202, dry-blending for at least 1 minute.

In the step S203, the mixture is wet-mixed for 5 to 8 minutes.

The ladle building process of the cast iron ladle can prolong the service life of the ladle and well solve the problems of ladle leakage and frequent ladle building.

Detailed Description

The following examples are included to provide further detailed description of the embodiments of the invention and to provide those skilled in the art with a more complete, concise and complete understanding of the principles and spirit of the invention, and to facilitate its practice.

The invention provides a casting iron ladle building process, which comprises the following steps:

s1, manufacturing an inner die;

s2, manufacturing a refractory casting material;

s5, demolding;

and S6, baking.

Specifically, a molten iron slag sample is first taken for analysis, and the main components and the weight percentage of the molten iron slag are shown in table one.

Watch 1

Sample number

SiO₂

CaO

MgO

Al₂O₃

Fe+Fe₂O₃

MnO

P2O₅

S

1#

45％

17％

3％

19％

11％

0.4％

0.3％

2#

43％

16％

3％

21％

11％

0.3％

0.1％

The temperature of the molten iron is basically detected to be 1440 ℃ to 1470 ℃, and the tapping time is 14 minutes to 18 minutes. Based on the above detection results, we imagine a novel method for pouring ladle material and ladle lining, two are selectedGrade vanadium soil is used as aggregate, SiC and Cr are added₂O₃And (3) performing a test and a repeated test to determine the chemical components by mass percent of the refractory castable: al (Al)₂O₃≥58％，SiO₂≥25％，SiC≥9％，Cr₂O₃Less than or equal to 2 percent, less than or equal to 1 percent of CaO, and the physical properties of the refractory castable are shown in Table 2.

TABLE 2

In the step S1, an inner mold is manufactured according to the volume of the ladle, the inner mold has a conical structure, and a release agent is coated on the surface of the inner mold. The centre form has a big footpath end and a path end, and the diameter of the big footpath end of centre form is greater than the diameter of path end, and the big footpath end and the path end of centre form are the relative both ends of the axial of centre form, and the big footpath end and the path end of centre form are circular and big footpath end and path end and are coaxial setting.

The step S2 includes the following steps:

s201, weighing: weighing various materials according to the adjusted formula;

s202, dry mixing: mixing and stirring the materials uniformly;

Preferably, in the above step S202, dry blending is performed for at least 1 minute.

Preferably, in the step S203, the mixture is wet-mixed for 5 to 8 minutes.

In the step S3, the prepared refractory castable is added to the ladle body and vibrated while being added to form the bottom of the ladle body, and the thickness of the bottom of the ladle body is controlled to 80 to 150 mm. And after the refractory pouring material is added, vibrating until no bubbles exist on the surface.

After the ladle bottom is solidified, in step S4, the inner mold is placed in the ladle body and the inner mold is located at the center of the ladle body, and then the refractory castable is used to cast the ladle wall of the ladle body, i.e., the refractory castable is added to the ladle body and surrounds the inner mold, and the ladle wall of the ladle body is formed by vibrating while feeding.

In the step S4, the inner mold is 100 mm higher than the ladle body, i.e., the distance between the end surface of the large diameter end of the ladle body (i.e., the top surface of the ladle body) and the top surface of the ladle body is controlled to be 100 mm, during the construction, the material is uniformly fed, the material is fed while vibrating, the vibrating rod is moved slowly in the circumferential direction, the entire outer layer of the ladle lining is continuously poured, the pouring is completed at one time, and the mold is removed after 24 hours.

In step S5, the inner mold is taken out of the ladle body.

In step S6, the inner mold is taken out of the ladle body, and the lining formed in the ladle body is baked. The water of the lining formed in the ladle body is not easy to discharge, so the temperature rise during baking is not too fast, a small amount of firewood is used for baking firstly, the firewood is added while the baking is carried out along with the rise of the temperature, and after the baking is carried out for 24 hours, a layer of graphite paint is brushed on the lining for use.

Example one

In this embodiment, in step S2, the refractory castable comprises the following chemical components in percentage by mass: al (Al)₂O₃ 59％，SiO₂ 30％，SiC 9％，Cr₂O₃1% and CaO 1%. The physical properties of the refractory castable are shown in Table 3.

TABLE 3

Example two

In this embodiment, in step S2, the refractory castable comprises the following chemical components in percentage by mass: al (Al)₂O₃ 59％，SiO₂ 26％，SiC 13％，Cr₂O₃1% and CaO 1%. The physical properties of the refractory castable are shown in Table 4.

TABLE 4

EXAMPLE III

In this embodiment, in step S2, the refractory castable comprises the following chemical components in percentage by mass: al (Al)₂O₃ 65％，SiO₂25% and 10% of SiC. The physical properties of the refractory castable are shown in Table 5.

TABLE 5

The present invention has been described above by way of example. It is to be understood that the specific implementations of the invention are not limited in this respect. Various insubstantial improvements are made by adopting the method conception and the technical scheme of the invention; the present invention is not limited to the above embodiments, and can be modified in various ways.

Claims

1. The cast iron ladle building process is characterized by comprising the following steps:

s1, manufacturing an inner die;

s2, manufacturing a refractory casting material;

s5, demolding;

and S6, baking.

2. The process of building a foundry ladle according to claim 1, wherein in step S1, an inner mold is formed according to the ladle capacity, the inner mold has a conical structure, and a mold release agent is coated on the surface of the inner mold.

3. The cast iron ladle foundry process according to claim 1 or 2, characterized in that in step S2, the refractory castable comprises the following chemical components in percentage by mass: al (Al)₂O₃≥58％，SiO₂≥25％，SiC≥9％，Cr₂O₃≤2％，CaO≤1％。

4. The cast iron ladle foundry process according to claim 3, wherein in the step S2, the refractory castable comprises the following chemical components in percentage by mass: al (Al)₂O₃ 59％，SiO₂ 30％，SiC 9％，Cr₂O₃ 1％，CaO 1％。

5. The cast iron ladle foundry process according to claim 3, wherein in the step S2, the refractory castable comprises the following chemical components in percentage by mass: al (Al)₂O₃ 59％，SiO₂ 26％，SiC 13％，Cr₂O₃ 1％，CaO 1％。

6. The cast iron ladle foundry process according to claim 3, wherein in the step S2, the refractory castable comprises the following chemical components in percentage by mass: al (Al)₂O₃ 65％，SiO₂ 25％，SiC 10％。

7. The cast iron ladle building process according to any one of claims 1 to 6, wherein the step S2 includes:

s201, weighing: weighing various materials according to the adjusted formula;

s202, dry mixing: mixing and stirring the materials uniformly;

8. The bagging process according to claim 7, wherein in step S202, the dry blending is performed for at least 1 minute.

9. The bag making process according to claim 7 or 8, wherein in the step S203, the wet mixing is performed for 5 to 8 minutes.