Calcium-zirconium refractory material and preparation method thereof

Abstract

The invention relates to a calcium-zirconium refractory material and a preparation method thereof. According to a technical scheme of the invention, the preparation method comprises the following steps: with 60 to 80 wt% of calcium oxide particles, 10 to 30 wt% of calcium oxide micropowder and 2 to 20 wt% of zirconium oxide micropowder as raw materials, adding 2 to 7 wt% of phenolic resin into theraw materials, carrying out stirring for 3 to 30 minutes, and carrying out press molding; and placing a molded green body into a high-temperature furnace, carrying out sintering under the condition of 1500 to 1800 DEG C for 3 to 6 hours, and carrying out cooling so as to obtain the calcium-zirconium refractory material. The preparation method provided by the invention has the characteristics of simple process and high production efficiency; and the calcium-zirconium refractory material prepared by using the preparation method provided by the invention has the advantages of high melting point,good thermodynamic stability, excellent vacuum stability, excellent melt erosion resistance and strong high-temperature melt purifying capacity, can be used as a lining of a metallurgical furnace anda container, and specifically meets the needs of clean steel production and vacuum melting.

Description

technical field

[0001] The invention belongs to the technical field of refractory materials. In particular, it relates to a calcium-zirconium refractory material and a preparation method thereof. Background technique

[0002] When smelting ultra-pure metals and alloys, people often hope that the refractories used for smelting contain free calcium oxide. In the process of contacting with the melt, free calcium oxide has the ability to remove sulfur, phosphorus and adsorb oxide inclusions. Among the known refractory oxides, calcium oxide has the best high temperature stability, and it adds little oxygen to the melt. Therefore, calcium oxide-based refractories are the most ideal lining for smelting.

[0003] However, free calcium oxide is easily hydrated in the atmosphere and difficult to store. Therefore, it will be very difficult to directly use calcium oxide as a raw material for refractory materials. Taking the working lining of steelmaking as an example, the current co...

Examples

Embodiment 1

[0025] A calcium-zirconium refractory material and a preparation method thereof. First, 60-70wt% of calcium oxide particles, 20-30wt% of calcium oxide fine powder and 2-10wt% of zirconia fine powder are used as raw materials, and then 2-4wt% of the raw material is added. Liquid phenolic resin, stirred for 3- 15 minutes, press molding; then place the shaped green body in a high-temperature furnace, burn at 1500-1600°C for 5-6 hours, and cool to obtain the calcium-zirconium refractory material.

[0026] The preparation method of the calcium oxide particles is as follows: adding an additive accounting for 0.2 to 2.0 wt% of the calcium hydroxide powder to the calcium hydroxide powder, wet grinding and blending for 1 to 5 hours, filtering, drying and powdering Grind to obtain mixed powder. Then place the mixed powder in the material tank of the granulation equipment, and add water accounting for 8-30 wt% of the mixed powder under the condition of the rotating speed of 1000-3000 rp...

Embodiment 2

[0030] A calcium-zirconium refractory material and a preparation method thereof. First, 70-80wt% calcium oxide particles, 10-20wt% calcium oxide fine powder and 15-20wt% zirconia fine powder are used as raw materials, and then 4-7wt% solid phenolic resin is added to the raw material, and stirred for 20-20 30 minutes, press molding. Then put the molded green body in a high-temperature furnace, burn it at 1700-1800°C for 3-4 hours, and cool it to get the calcium-zirconium refractory material.

[0031] The preparation method of the calcium oxide particles described in this example is the same as in Example 1 except that the additive is zirconia powder.

[0032] The calcium-zirconium refractory material prepared in this embodiment is tested: the porosity is 12-14%; the compressive strength is 40-50 MPa.

Embodiment 3

[0034] A calcium-zirconium refractory material and a preparation method thereof. 65-75wt% of calcium oxide particles, 15-25wt% of calcium oxide fine powder and 10-15wt% of zirconia fine powder are used as raw materials, and 2-4wt% of solid phenolic resin and 1-3wt% of the raw materials are added The solid phenolic resin is stirred for 15 to 25 minutes, and pressed into shape. Then put it in a high-temperature furnace and burn it at 1600-1700°C for 4-5 hours, and then cool it to get a calcium-zirconium refractory material.

[0035] The preparation method of calcium oxide particles described in this embodiment is the same as in Example 1 except that the additive is yttrium oxide powder.

[0036] The calcium-zirconium refractory material prepared in this embodiment is tested: the porosity is 12-13%; the compressive strength is 50-60 MPa.

[0037] Compared with the prior art, this specific embodiment has the following positive effects:

[0038] 1) In this specific embodiment, a...

technical field

[0001] The invention belongs to the technical field of refractory materials. In particular, it relates to a calcium-zirconium refractory material and a preparation method thereof. Background technique

[0002] When smelting ultra-pure metals and alloys, people often hope that the refractories used for smelting contain free calcium oxide. In the process of contacting with the melt, free calcium oxide has the ability to remove sulfur, phosphorus and adsorb oxide inclusions. Among the known refractory oxides, calcium oxide has the best high temperature stability, and it adds little oxygen to the melt. Therefore, calcium oxide-based refractories are the most ideal lining for smelting.

[0003] However, free calcium oxide is easily hydrated in the atmosphere and difficult to store. Therefore, it will be very difficult to directly use calcium oxide as a raw material for refractory materials. Taking the working lining of steelmaking as an example, the current co...

Examples

Embodiment 1

[0025] A calcium-zirconium refractory material and a preparation method thereof. First, 60-70wt% of calcium oxide particles, 20-30wt% of calcium oxide fine powder and 2-10wt% of zirconia fine powder are used as raw materials, and then 2-4wt% of the raw material is added. Liquid phenolic resin, stirred for 3- 15 minutes, press molding; then place the shaped green body in a high-temperature furnace, burn at 1500-1600°C for 5-6 hours, and cool to obtain the calcium-zirconium refractory material.

[0026] The preparation method of the calcium oxide particles is as follows: adding an additive accounting for 0.2 to 2.0 wt% of the calcium hydroxide powder to the calcium hydroxide powder, wet grinding and blending for 1 to 5 hours, filtering, drying and powdering Grind to obtain mixed powder. Then place the mixed powder in the material tank of the granulation equipment, and add water accounting for 8-30 wt% of the mixed powder under the condition of the rotating speed of 1000-3000 rp...

Embodiment 2

[0030] A calcium-zirconium refractory material and a preparation method thereof. First, 70-80wt% calcium oxide particles, 10-20wt% calcium oxide fine powder and 15-20wt% zirconia fine powder are used as raw materials, and then 4-7wt% solid phenolic resin is added to the raw material, and stirred for 20-20 30 minutes, press molding. Then put the molded green body in a high-temperature furnace, burn it at 1700-1800°C for 3-4 hours, and cool it to get the calcium-zirconium refractory material.

[0031] The preparation method of the calcium oxide particles described in this example is the same as in Example 1 except that the additive is zirconia powder.

[0032] The calcium-zirconium refractory material prepared in this embodiment is tested: the porosity is 12-14%; the compressive strength is 40-50 MPa.

Embodiment 3

[0034] A calcium-zirconium refractory material and a preparation method thereof. 65-75wt% of calcium oxide particles, 15-25wt% of calcium oxide fine powder and 10-15wt% of zirconia fine powder are used as raw materials, and 2-4wt% of solid phenolic resin and 1-3wt% of the raw materials are added The solid phenolic resin is stirred for 15 to 25 minutes, and pressed into shape. Then put it in a high-temperature furnace and burn it at 1600-1700°C for 4-5 hours, and then cool it to get a calcium-zirconium refractory material.

[0035] The preparation method of calcium oxide particles described in this embodiment is the same as in Example 1 except that the additive is yttrium oxide powder.

[0036] The calcium-zirconium refractory material prepared in this embodiment is tested: the porosity is 12-13%; the compressive strength is 50-60 MPa.

[0037] Compared with the prior art, this specific embodiment has the following positive effects:

[0038] 1) In this specific embodiment, a...