Novel furnace door brick glaze and preparation method thereof

Abstract

The invention discloses a novel furnace door brick glaze and a preparation method thereof. The brick glaze comprises the following components in percentage by mass: 10-20% of feldspar, 20-30% of talc, 10-20% of calcite, 10-20% of quartz powder, 5-15% of zirconium dioxide, 5-10% of Suzhou soil and 5-10% of zinc oxide. The preparation method comprises the following steps: weighing each component raw material according to the proportion; putting the weighed raw materials into a ball barrel, and adding water for co-grinding to form glaze water; uniformly spraying the glaze water on the surface of the furnace door brick; and sending the furnace door brick into a kiln for firing to finish the preparation of the brick glaze. According to the invention, the dependence of the furnace door brick glaze on spodumene is eliminated, the furnace door brick glaze without a spodumene system is obtained, the limitation of spodumene on yield is eliminated under the condition of ensuring high toughness and thermal shock resistance stability of the furnace door brick glaze, the yield of the furnace door brick is increased, the cost of the brick glaze is reduced, and the market competitiveness is improved.

Description

Technical Field

[0001] The invention belongs to the field of refractory material preparation, relates to the preparation of brick glaze, and specifically relates to a novel furnace door brick glaze and a preparation method thereof. Background Art

[0002] Traditional cordierite furnace door bricks for coke ovens are increasingly unable to meet production needs due to their short service life, long maintenance time and troublesome replacement, which seriously restricts the output of coke. In order to solve this problem, large-scale glazed cordierite furnace door bricks that are cast as a whole have been developed. Compared with previous bricks, this type of brick has a longer service life and is easier to replace. In order to ensure that the glaze is firmly bonded to the brick body without cracking or peeling, it is necessary to introduce spodumene with a low expansion coefficient into the glaze. However, with the development and popularity of new energy, the resources of lithium raw materials are very tight. The market was once faced with the situation where there was no spodumene available. At the same time, due to the shortage and characteristics of lithium resources, the cost of furnace door brick glaze is relatively high, which greatly limits the output and development of furnace door bricks.

[0003] Therefore, a new technical solution is needed to solve this problem. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, a new type of furnace door brick glaze and a preparation method thereof are provided, which gets rid of the dependence of the furnace door brick glaze on spodumene, and obtains a furnace door brick glaze that does not contain a spodumene system. While ensuring the high toughness and thermal shock stability of the furnace door brick glaze, the restriction of spodumene on production is eliminated, which not only expands the production of furnace door bricks, but also reduces the cost of brick glaze and improves market competitiveness.

[0005] Technical solution: To achieve the above purpose, the present invention provides a new type of furnace door brick glaze, which includes the following components in terms of mass percentage:

[0006] 10%-20% feldspar, 20%-30% talc, 10%-20% calcite, 10%-20% quartz powder, 5%-15% zirconium dioxide, 5%-10% Suzhou clay, 5%-10% zinc oxide.

[0007] The present invention also provides a method for preparing a novel furnace door brick glaze, comprising the following steps:

[0008] S1: Weigh each component raw material according to the proportion;

[0009] S2: Put the weighed raw materials into a ball bucket, add water and grind them together to form glaze water;

[0010] S3: Spray the glaze water evenly on the surface of the furnace door bricks;

[0011] S4: Send the furnace door bricks into the kiln for firing, completing the preparation of the brick glaze.

[0012] Furthermore, the amount of water added in step S2 is 60% of the weight of the weighed raw materials.

[0013] Furthermore, the co-grinding time in step S2 is 23 to 25 hours.

[0014] Furthermore, in step S3, the glaze water is evenly sprayed on the surface of the furnace door bricks, and the glaze thickness is controlled to be 1-2 mm.

[0015] Furthermore, in step S4, the sintering temperature is controlled at 1200°C-1300°C.

[0016] The existing furnace door brick glaze uses a large amount of spodumene. Because spodumene has a low expansion coefficient, the glaze surface of the brick can achieve a low expansion coefficient, which improves the stability of the glaze surface and allows the glaze surface to stably exist on the surface of the furnace door brick without large cracks and peeling. Because spodumene is a medium-temperature raw material, other medium-temperature raw materials are needed to adjust the firing temperature of the furnace door bricks.

[0017] With respect to the above-mentioned existing furnace door brick glaze, in order to get rid of the dependence of brick glaze on spodumene, the furnace door brick glaze provided by the present invention selects talc and zinc oxide with relatively low expansion coefficients, and increases their usage to minimize the expansion coefficient of the glaze surface. Since talc, calcite and zinc oxide in the raw materials are all low-temperature raw materials, the present invention uses zirconium dioxide, a high-temperature raw material, to adjust the temperature, thereby adjusting the firing temperature of the furnace door bricks.

[0018] The technical difficulty of the present invention is that talc and zinc oxide alone cannot achieve the same glaze expansion coefficient as spodumene, while the use of zirconium dioxide achieves an effect beyond expectations from another perspective, specifically including the following two points:

[0019] ① Zirconium dioxide does not participate in the melting of the glaze, but plays a filling role to increase the hardness and strength of the glaze.

[0020] The principle is that at the specific firing temperature of the furnace door bricks, zirconium dioxide will not melt; on the one hand, zirconium dioxide plays a role similar to particle filling, and on the other hand, zirconium dioxide itself has good strength and hardness. The combination of the two can effectively increase the hardness and strength of the glaze.

[0021] ② Zirconium dioxide undergoes a crystal phase transformation at high temperatures to produce microcracks, which can effectively increase the toughness and thermal shock resistance of the glaze.

[0022] The principle of the crystal phase transformation and microcracks is that during the heating process, monoclinic zirconium dioxide will transform into tetragonal zirconium dioxide and be accompanied by a large volume shrinkage, so that a crystal phase transformation will occur and microcracks will be produced. The temperature at which the zirconium dioxide crystal phase transformation occurs is around 1200°C, which just matches the firing temperature.

[0023] The present invention changes the toughness and thermal shock resistance of the glaze itself by adding zirconium dioxide, and increases the hardness and strength of the glaze, thereby compensating for the lack of glaze stability caused by the difference in the glaze expansion coefficient, and can achieve the glaze to be stably present on the surface of the furnace door brick without large cracks and peeling, perfectly replacing the stone furnace door brick glaze containing the spodumene system, and has a very large cost advantage. Among them, the improvement of toughness and thermal shock stability are related to the generation of microcracks, but the thermal shock stability also depends on the strength of the glaze and its own expansion coefficient, porosity, etc.

[0024] In the present invention, the amount of zirconium dioxide input must not only meet the requirements of firing temperature adjustment, but also meet the requirements of the toughness and thermal shock resistance of the glaze itself. Both are indispensable. This cannot be easily achieved by simply adjusting the amount of zirconium dioxide input. This requires a specific ratio between the amount of zirconium dioxide input and other raw materials to achieve this effect. This effect is an innovative discovery and cannot be obtained by simple multiple experiments.

[0025] Beneficial effects: Compared with the prior art, the present invention gets rid of the dependence of furnace door brick glaze on spodumene, and obtains a furnace door brick glaze that does not contain a spodumene system. While ensuring the high toughness and thermal shock stability of the furnace door brick glaze, the glaze surface is stably present on the surface of the furnace door brick without large-scale cracking and peeling, eliminating the restriction of spodumene on production, not only expanding the production of furnace door bricks, but also reducing the cost of brick glaze and improving market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a glaze display of the furnace door brick glaze obtained in Example 1. DETAILED DESCRIPTION

[0027] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0028] Embodiment 1:

[0029] This embodiment provides a new type of furnace door brick glaze, which includes the following components in terms of mass percentage:

[0030] 20% feldspar, 20% talc, 20% calcite, 20% quartz powder, 5% zirconium dioxide, 10% Suzhou clay, 5% zinc oxide.

[0031] This embodiment also provides a method for preparing a novel furnace door brick glaze, comprising the following steps:

[0032] S1: weigh each component raw material according to the above ratio;

[0033] S2: Put the weighed raw materials into a ball bucket, add 60% water of the raw materials weight and grind for 23 hours to form glaze water;

[0034] S3: Use a high-pressure spray gun to evenly spray the glaze water on the surface of the furnace door bricks, and control the glaze thickness to 1mm;

[0035] S4: The furnace door bricks are sent into the tunnel kiln for firing. The firing temperature is controlled at 1200°C to complete the preparation of the brick glaze. The brick glaze is stably present on the furnace door bricks. The glaze surface is as follows: Figure 1 shown.

[0036] Embodiment 2:

[0037] This embodiment provides a new type of furnace door brick glaze, which includes the following components in terms of mass percentage:

[0038] 10% feldspar, 30% talc, 10% calcite, 20% quartz powder, 15% zirconium dioxide, 5% Suzhou clay, 10% zinc oxide.

[0039] This embodiment also provides a method for preparing a novel furnace door brick glaze, comprising the following steps:

[0040] S1: weigh each component raw material according to the above ratio;

[0041] S2: Put the weighed raw materials into a ball bucket, add 60% water of the raw materials weight and grind for 24 hours to form glaze water;

[0042] S3: Use a high-pressure spray gun to evenly spray the glaze water on the surface of the furnace door bricks, and control the glaze thickness to 2mm;

[0043] S4: The furnace door bricks are sent into the tunnel kiln for firing. The firing temperature is controlled at 1300°C to complete the preparation of the brick glaze. The brick glaze is stably present on the furnace door bricks.

[0044] Embodiment 3:

[0045] This embodiment provides a new type of furnace door brick glaze, which includes the following components in terms of mass percentage:

[0046] 15% feldspar, 25% talc, 18% calcite, 16% quartz powder, 10% zirconium dioxide, 8% Suzhou clay, 8% zinc oxide.

[0047] This embodiment also provides a method for preparing a novel furnace door brick glaze, comprising the following steps:

[0048] S1: weigh each component raw material according to the above ratio;

[0049] S2: Put the weighed raw materials into a ball bucket, add 60% water of the raw materials weight and grind for 25 hours to form glaze water;

[0050] S3: Use a high-pressure spray gun to evenly spray the glaze on the surface of the furnace door bricks, and control the glaze thickness to 1.6mm;

[0051] S4: The furnace door bricks are sent into the tunnel kiln for firing. The firing temperature is controlled at 1250°C to complete the preparation of the brick glaze. The brick glaze is stably present on the furnace door bricks.

[0052] Comparative Example 1:

[0053] The furnace door brick glaze obtained in Examples 1 to 3 was compared with the furnace door brick glaze of the existing spodumene system for performance analysis, and the specific data are shown in Table 1 below:

[0054] Table 1 - Furnace door brick glaze performance test data

[0055]

[0056] According to the test data in Table 1, it can be seen that the furnace door brick glazes of Examples 1 to 3 provided by the present invention are basically consistent in glaze surface quality and thermal shock peeling performance compared with the existing spodumene furnace door brick glazes, and the maximum length of underglaze cracks is not much different. Therefore, it can be seen that the furnace door brick glazes of Examples 1 to 3 are basically consistent in overall performance compared with the existing spodumene furnace door brick glazes. The furnace door brick glazes of Examples 1 to 3 can also achieve a glaze surface that is stably present on the surface of the furnace door bricks without large cracking and peeling. Therefore, the furnace door brick glazes of Examples 1 to 3 can completely replace the existing spodumene furnace door brick glazes, thereby eliminating the limitation of spodumene raw materials on the output of furnace door brick glazes, which not only expands the output of furnace door bricks, but also greatly reduces the cost of brick glazes.

Claims

1. A new type of furnace door brick glaze, characterized in that: The components include the following in percentage by mass: 10%-20% feldspar, 20%-30% talc, 10%-20% calcite, 10%-20% quartz powder, 5%-15% zirconium dioxide, 5%-10% Suzhou clay, 5%-10% zinc oxide.

2. The method for preparing a novel furnace door brick glaze according to claim 1, characterized in that: The steps include: S1: Weigh each component raw material according to the proportion; S2: Put the weighed raw materials into a ball bucket, add water and grind them together to form glaze water; S3: Spray the glaze water evenly on the surface of the furnace door bricks; S4: Send the furnace door bricks into the kiln for firing, completing the preparation of the brick glaze.

3. The method for preparing a novel furnace door brick glaze according to claim 2, characterized in that: The amount of water added in step S2 is 60% of the weight of the raw materials.

4. The method for preparing a novel furnace door brick glaze according to claim 2, characterized in that: The co-grinding time in step S2 is 23 to 25 hours.

5. The method for preparing a novel furnace door brick glaze according to claim 2, characterized in that: In step S3, the glaze water is evenly sprayed on the surface of the furnace door bricks, and the glaze thickness is controlled to be 1-2 mm.

6. The method for preparing a novel furnace door brick glaze according to claim 2, characterized in that: In step S4, the sintering temperature is controlled at 1200°C-1300°C.

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