Refractory material based on secondary aluminum ash, preparation method and application

Abstract

The invention discloses a refractory material based on secondary aluminum ash, a preparation method and application. Relates to the field of recycling of secondary aluminum ash. The refractory material based on the secondary aluminum ash is prepared from the following components in percentage by weight: 45-60 wt% of secondary aluminum ash; 30 to 50 wt% of kaolin; and 5-12 wt% of attapulgite. The preparation method of the refractory material comprises the following steps: S1, pretreating raw materials; s2, mixing and grinding; and S3, mixing and calcining. The refractory material is applied to the field of steel and ceramic production. The attapulgite is added, so that the bonding force between the secondary aluminum ash and the kaolin is enhanced, the high-temperature anti-cracking performance of the prepared refractory material is improved, the prepared refractory material is small in density, and the transportation cost and the construction difficulty can be effectively reduced when the refractory material is used for steel and ceramic production.

Description

Technical Field

[0001] The present application relates to the technical field, and in particular to refractory materials based on secondary aluminum ash, preparation methods and applications. Background Art

[0002] Refractory materials are used in various fields of the national economy, such as steel, non-ferrous metals, glass, cement, ceramics, petrochemicals, machinery, boilers, light industry, electric power, and military industry. They are essential basic materials to ensure the production operation and technological development of the above industries, and play an irreplaceable and important role in the development of high-temperature industrial production.

[0003] Common refractory materials have a high aluminum content, so a large amount of aluminum resources are needed when preparing refractory materials.

[0004] As a major aluminum industry country, my country produces a huge amount of aluminum ash every year, and the amount is increasing year by year. However, in terms of resource utilization, there are always problems such as high energy consumption and low product value.

[0005] There are many existing technologies about preparing refractory materials through aluminum ash, but there are still technical difficulties in the actual recycling and reuse of secondary aluminum ash, which leads to a large amount of secondary aluminum ash being stored in enterprises. Therefore, it is necessary to find a process that can apply secondary aluminum ash to the preparation of refractory materials. Summary of the invention

[0006] In order to solve at least one of the above technical problems, a process for preparing refractory materials through secondary aluminum ash is developed. The present application provides refractory materials based on secondary aluminum ash, preparation methods and applications.

[0007] On the one hand, the present application provides a refractory material based on secondary aluminum ash, which is prepared from the following components by weight percentage:

[0008] Secondary aluminum ash 45-60wt%;

[0009] Kaolin 30-50wt%;

[0010] Attapulgite 5-12wt%.

[0011] Optionally, the weight ratio of the secondary aluminum ash to attapulgite is 5.5-9.

[0012] Optionally, in the secondary aluminum ash, the weight proportion of aluminum oxide is 50-60wt%; the weight proportion of magnesium oxide is 5-7wt%; and the weight proportion of silicon dioxide is no more than 12wt%.

[0013] Optionally, the particle size of the attapulgite is 0.2 to 100 μm.

[0014] In a second aspect, the present application provides a method for preparing the above-mentioned refractory material, comprising the following steps:

[0015] S1. Raw material pretreatment

[0016] The secondary aluminum ash and kaolin are calcined respectively;

[0017] S2. Mixing and grinding

[0018] The calcined secondary aluminum ash is mechanically mixed with kaolin and ground through a 120-200 mesh sieve to obtain a mixture;

[0019] S3. Mixed calcination

[0020] The mixture prepared in S2 is mixed with attapulgite and calcined to obtain a refractory material.

[0021] Optionally, in S1, the calcination temperature of the secondary aluminum ash is 900-1000°C.

[0022] Optionally, in S1, the calcination temperature of kaolin is 1000-1050°C.

[0023] Optionally, in S3, the calcination temperature is 1500-1800°C.

[0024] Optionally, in S3, the calcination environment is an oxygen-rich environment.

[0025] In a third aspect, the present application provides the application of the above-mentioned refractory materials in the fields of steel and ceramic production.

[0026] In summary, the present application enhances the bonding force between secondary aluminum ash and kaolin by adding attapulgite, thereby improving the high-temperature anti-cracking performance of the manufactured refractory material, thereby improving the refractoriness of the refractory material, and the density of the manufactured refractory material is small, which can effectively reduce transportation costs and construction difficulty when used in steel and ceramic production. DETAILED DESCRIPTION

[0027] The present application is further described in detail below with reference to the embodiments.

[0028] In the following examples of the present application, the main components involved were purchased from commercial products unless otherwise specified.

[0029] Secondary aluminum ash: aluminum oxide accounts for 50-60wt% by weight; magnesium oxide accounts for 5-7wt% by weight; silicon dioxide accounts for no more than 12wt% by weight;

[0030] Attapulgite: particle size is 0.2~100μm.

[0031] Example 1

[0032] In this embodiment, secondary aluminum ash and kaolin are used as main materials, and an appropriate amount of attapulgite is added to prepare a refractory material; the specific addition ratio is 45wt% of secondary aluminum ash, 50wt% of kaolin, and 5wt% of attapulgite.

[0033] The secondary aluminum ash is calcined at 900°C; the kaolin is calcined at 1000°C; the calcined secondary aluminum ash is mechanically mixed with the kaolin, and ground through a 120-mesh sieve to obtain a mixture; the obtained mixture is mixed with attapulgite, and calcined at 1500°C in an oxygen-rich environment to obtain a refractory material.

[0034] Example 2

[0035] In this embodiment, secondary aluminum ash and kaolin are used as main materials, and an appropriate amount of attapulgite is added to prepare a refractory material; the specific addition ratio is 48wt% of secondary aluminum ash, 42wt% of kaolin, and 10wt% of attapulgite.

[0036] The secondary aluminum ash is calcined at 900-℃; the kaolin is calcined at 1000℃; the calcined secondary aluminum ash is mechanically mixed with kaolin, and ground through a 120-mesh sieve to obtain a mixture; the obtained mixture is mixed with attapulgite, and calcined at 1500℃ in an oxygen-rich environment to obtain a refractory material.

[0037] Example 3

[0038] In this embodiment, secondary aluminum ash and kaolin are used as main materials, and an appropriate amount of attapulgite is added to prepare a refractory material; the specific addition ratio is 50wt% of secondary aluminum ash, 38wt% of kaolin, and 12wt% of attapulgite.

[0039] The secondary aluminum ash is calcined at 900°C; the kaolin is calcined at 1000°C; the calcined secondary aluminum ash is mechanically mixed with the kaolin, and ground through a 120-mesh sieve to obtain a mixture; the obtained mixture is mixed with attapulgite, and calcined at 1500°C in an oxygen-rich environment to obtain a refractory material.

[0040] Example 4

[0041] In this embodiment, secondary aluminum ash and kaolin are used as main materials, and an appropriate amount of attapulgite is added to prepare a refractory material; the specific addition ratio is 52wt% of secondary aluminum ash, 43wt% of kaolin, and 5wt% of attapulgite.

[0042] The secondary aluminum ash is calcined at 900°C; the kaolin is calcined at 1000°C; the calcined secondary aluminum ash is mechanically mixed with the kaolin, and ground through a 120-mesh sieve to obtain a mixture; the obtained mixture is mixed with attapulgite, and calcined at 1500°C in an oxygen-rich environment to obtain a refractory material.

[0043] Example 5

[0044] In this embodiment, secondary aluminum ash and kaolin are used as main materials, and an appropriate amount of attapulgite is added to prepare a refractory material; the specific addition ratio is 55wt% of secondary aluminum ash, 35wt% of kaolin, and 10wt% of attapulgite.

[0045] The secondary aluminum ash is calcined at 900°C; the kaolin is calcined at 1000°C; the calcined secondary aluminum ash is mechanically mixed with the kaolin, and ground through a 120-mesh sieve to obtain a mixture; the obtained mixture is mixed with attapulgite, and calcined at 1500°C in an oxygen-rich environment to obtain a refractory material.

[0046] Example 6

[0047] In this embodiment, secondary aluminum ash and kaolin are used as main materials, and an appropriate amount of attapulgite is added to prepare a refractory material; the specific addition ratio is 58wt% of secondary aluminum ash, 30wt% of kaolin, and 12wt% of attapulgite.

[0048] The secondary aluminum ash is calcined at 900°C; the kaolin is calcined at 1000°C; the calcined secondary aluminum ash is mechanically mixed with the kaolin, and ground through a 120-mesh sieve to obtain a mixture; the obtained mixture is mixed with attapulgite, and calcined at 1500°C in an oxygen-rich environment to obtain a refractory material.

[0049] Example 7

[0050] In this embodiment, secondary aluminum ash and kaolin are used as main materials, and an appropriate amount of attapulgite is added to prepare a refractory material; the specific addition ratio is 60wt% of secondary aluminum ash, 30wt% of kaolin, and 10wt% of attapulgite.

[0051] The secondary aluminum ash is calcined at 900°C; the kaolin is calcined at 1000°C; the calcined secondary aluminum ash is mechanically mixed with the kaolin, and ground through a 120-mesh sieve to obtain a mixture; the obtained mixture is mixed with attapulgite, and calcined at 1500°C in an oxygen-rich environment to obtain a refractory material.

[0052] The density and refractoriness of the refractory materials prepared in Examples 1 to 7 were measured, and the results are shown in Table 1.

[0053] Table 1

[0054] Refractory Materials Weight Ratio <![CDATA[Density (g / cm 3 )]]> Refractoriness Example 1 9.00 3.87 ＞1850℃ Example 2 4.80 3.75 ＞1770℃ Example 3 4.17 3.65 ＞1770℃ Example 4 10.40 3.73 ＞1770℃ Example 5 5.50 3.61 ＞1850℃ Example 6 4.83 3.52 ＞1770℃ Example 7 6.00 3.48 ＞1850℃

[0055] It can be seen from Examples 1 to 7 and Table 1 that the density of the refractory material prepared in this application does not exceed 4 g / cm 3 , even up to 3.5g / cm 3 Below, and the refractoriness can reach above 1770℃.

[0056] It can be seen from Table 1 that the refractoriness of Example 1, Example 5 and Example 7 is higher than that of other examples, reaching above 1850°C. Through analysis, it is found that when the weight ratio of secondary aluminum ash to attapulgite in the formula of the present application is in the range of 5.5 to 9, the refractoriness of the prepared refractory material is higher.

[0057] For further verification, the inventors prepared the following Examples 8 to 15.

[0058] Among them, Examples 8 to 10 are based on Example 1, except that only the addition amounts of secondary aluminum ash and attapulgite are changed, as follows.

[0059] Example 8

[0060] In this embodiment, secondary aluminum ash and kaolin are used as main materials, and an appropriate amount of attapulgite is added to prepare a refractory material; the specific addition ratio is 42wt% of secondary aluminum ash, 50wt% of kaolin, and 8wt% of attapulgite.

[0061] The secondary aluminum ash is calcined at 900°C; the kaolin is calcined at 1000°C; the calcined secondary aluminum ash is mechanically mixed with the kaolin, and ground through a 120-mesh sieve to obtain a mixture; the obtained mixture is mixed with attapulgite, and calcined at 1500°C in an oxygen-rich environment to obtain a refractory material.

[0062] Example 9

[0063] In this embodiment, secondary aluminum ash and kaolin are used as main materials, and an appropriate amount of attapulgite is added to prepare a refractory material; the specific addition ratio is 43wt% of secondary aluminum ash, 50wt% of kaolin, and 7wt% of attapulgite.

[0064] The secondary aluminum ash is calcined at 900°C; the kaolin is calcined at 1000°C; the calcined secondary aluminum ash is mechanically mixed with the kaolin, and ground through a 120-mesh sieve to obtain a mixture; the obtained mixture is mixed with attapulgite, and calcined at 1500°C in an oxygen-rich environment to obtain a refractory material.

[0065] Example 10

[0066] In this embodiment, secondary aluminum ash and kaolin are used as main materials, and an appropriate amount of attapulgite is added to prepare a refractory material; the specific addition ratio is 44wt% of secondary aluminum ash, 50wt% of kaolin, and 6wt% of attapulgite.

[0067] The secondary aluminum ash is calcined at 900°C; the kaolin is calcined at 1000°C; the calcined secondary aluminum ash is mechanically mixed with the kaolin, and ground through a 120-mesh sieve to obtain a mixture; the obtained mixture is mixed with attapulgite, and calcined at 1500°C in an oxygen-rich environment to obtain a refractory material.

[0068] The density and refractoriness of the refractory materials prepared in Examples 8 to 10 were measured. The results are shown in Table 2.

[0069] Table 2

[0070] Refractory Materials Weight Ratio <![CDATA[Density (g / cm 3 )]]> Refractoriness Example 8 5.25 3.79 ＞1770℃ Example 9 6.14 3.81 ＞1850℃ Example 10 7.33 3.85 ＞1850℃ Example 1 9.00 3.87 ＞1850℃

[0071] It is further verified through Example 1, Examples 8 to 10 and Table 2 that when the weight ratio of secondary aluminum ash to attapulgite in the formula of the present application is in the range of 5.5 to 9, the refractoriness of the prepared refractory material is relatively high.

[0072] Among them, Examples 11 to 15 are based on Example 5, except that only the addition amounts of secondary aluminum ash and attapulgite are changed, as follows.

[0073] Embodiment 11

[0074] In this embodiment, secondary aluminum ash and kaolin are used as main materials, and an appropriate amount of attapulgite is added to prepare a refractory material; the specific addition ratio is 54wt% of secondary aluminum ash, 35wt% of kaolin, and 11wt% of attapulgite.

[0075] The secondary aluminum ash is calcined at 900°C; the kaolin is calcined at 1000°C; the calcined secondary aluminum ash is mechanically mixed with the kaolin, and ground through a 120-mesh sieve to obtain a mixture; the obtained mixture is mixed with attapulgite, and calcined at 1500°C in an oxygen-rich environment to obtain a refractory material.

[0076] Example 12

[0077] In this embodiment, secondary aluminum ash and kaolin are used as main materials, and an appropriate amount of attapulgite is added to prepare a refractory material; the specific addition ratio is 56wt% of secondary aluminum ash, 35wt% of kaolin, and 9wt% of attapulgite.

[0078] The secondary aluminum ash is calcined at 900°C; the kaolin is calcined at 1000°C; the calcined secondary aluminum ash is mechanically mixed with the kaolin, and ground through a 120-mesh sieve to obtain a mixture; the obtained mixture is mixed with attapulgite, and calcined at 1500°C in an oxygen-rich environment to obtain a refractory material.

[0079] Example 13

[0080] In this embodiment, secondary aluminum ash and kaolin are used as main materials, and an appropriate amount of attapulgite is added to prepare a refractory material; the specific addition ratio is 57wt% of secondary aluminum ash, 35wt% of kaolin, and 8wt% of attapulgite.

[0081] The secondary aluminum ash is calcined at 900°C; the kaolin is calcined at 1000°C; the calcined secondary aluminum ash is mechanically mixed with the kaolin, and ground through a 120-mesh sieve to obtain a mixture; the obtained mixture is mixed with attapulgite, and calcined at 1500°C in an oxygen-rich environment to obtain a refractory material.

[0082] Embodiment 14

[0083] In this embodiment, secondary aluminum ash and kaolin are used as main materials, and an appropriate amount of attapulgite is added to prepare a refractory material; the specific addition ratio is 58wt% of secondary aluminum ash, 35wt% of kaolin, and 7wt% of attapulgite.

[0084] The secondary aluminum ash is calcined at 900°C; the kaolin is calcined at 1000°C; the calcined secondary aluminum ash is mechanically mixed with the kaolin, and ground through a 120-mesh sieve to obtain a mixture; the obtained mixture is mixed with attapulgite, and calcined at 1500°C in an oxygen-rich environment to obtain a refractory material.

[0085] Embodiment 15

[0086] In this embodiment, secondary aluminum ash and kaolin are used as main materials, and an appropriate amount of attapulgite is added to prepare a refractory material; the specific addition ratio is 59wt% of secondary aluminum ash, 35wt% of kaolin, and 6wt% of attapulgite.

[0087] The secondary aluminum ash is calcined at 900°C; the kaolin is calcined at 1000°C; the calcined secondary aluminum ash is mechanically mixed with the kaolin, and ground through a 120-mesh sieve to obtain a mixture; the obtained mixture is mixed with attapulgite, and calcined at 1500°C in an oxygen-rich environment to obtain a refractory material.

[0088] The density and refractoriness of the refractory materials prepared in the above Examples 11 to 15 were measured, and the results are shown in Table 3.

[0089] Table 3

[0090] Refractory Materials Weight Ratio <![CDATA[Density (g / cm 3 )]]> Refractoriness Embodiment 11 4.91 3.59 ＞1770℃ Example 5 5.50 3.61 ＞1850℃ Example 12 6.22 3.64 ＞1850℃ Example 13 7.13 3.67 ＞1850℃ Embodiment 14 8.29 3.69 ＞1850℃ Embodiment 15 9.83 3.70 ＞1770℃

[0091] It is further verified through Example 5, Examples 11 to 15 and Table 3 that when the weight ratio of secondary aluminum ash to attapulgite in the formula of the present application is in the range of 5.5 to 9, the refractoriness of the prepared refractory material is relatively high.

[0092] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A refractory material based on secondary aluminum ash, characterized in that: Prepared from the following components by weight percentage: Secondary aluminum ash 45-60wt%; Kaolin 30-50wt%; Attapulgite 5-12wt%.

2. The refractory material according to claim 1, characterized in that The weight ratio of the secondary aluminum ash to attapulgite is 5.5-9.

3. The refractory material according to claim 1, characterized in that: In the secondary aluminum ash, the weight proportion of aluminum oxide is 50-60wt%; the weight proportion of magnesium oxide is 5-7wt%; and the weight proportion of silicon dioxide is no more than 12wt%.

4. The refractory material according to claim 1, characterized in that: The particle size of the attapulgite is 0.2 to 100 μm.

5. A method for preparing a refractory material according to claim 1, characterized in that: The following steps are involved: S1. Raw material pretreatment The secondary aluminum ash and kaolin are calcined respectively; S2, Mixing and Grinding The calcined secondary aluminum ash is mechanically mixed with kaolin and ground through a 120-200 mesh sieve to obtain a mixture; S3. Mixed calcination The mixture prepared in S2 is mixed with attapulgite and calcined to obtain a refractory material.

6. The preparation method according to claim 5, characterized in that: In the above-mentioned S1, the calcination temperature of the secondary aluminum ash is 900-1000°C.

7. The preparation method according to claim 5, characterized in that: In the above S1, the calcination temperature of kaolin is 1000-1050°C.

8. The preparation method according to claim 5, characterized in that: In the above-mentioned S3, the calcination temperature is 1500-1800°C.

9. The preparation method according to claim 5, characterized in that: In S3, the calcination environment is an oxygen-rich environment.

10. Use of the refractory material according to claim 1 in the field of steel and ceramic production.