Electric furnace ramming material and preparation method thereof

Abstract

The present invention relates to an electric furnace ramming material and a preparation method thereof, comprising the following components in parts by weight: 60 to 80 parts of fused magnesia with a particle size of 4 to 1 mm; 40 to 50 parts of fused magnesia with a particle size of 1 to 0 mm; 20 to 30 parts of fused magnesia powder with a particle size of ≤0.074; 5 to 10 parts of a binder; 3 to 5 parts of an antioxidant; and 1 to 3 parts of carbon black. The ingredients are weighed and mixed according to the above ratio, and the fused magnesia with a particle size of 4 to 1 mm, the fused magnesia with a particle size of 1 to 0 mm, and the fused magnesia powder with a particle size of ≤0.074 are mixed and stirred evenly; then, the carbon black and the antioxidant are added to the mixture and the stirring is continued evenly; finally, the binder is added to the above mixture and stirred until the mixture is evenly mixed. The ramming material prepared by the method has good anti-erosion and anti-scouring capabilities.

Description

Technical Field

[0001] The invention relates to the technical field of refractory materials, in particular to an electric furnace ramming material and a preparation method thereof. Background Art

[0002] Electric furnace ramming material is a semi-wet refractory mixture constructed by ramming method. It relies on forced ramming to form a dense body, and hardens after heating, baking or roasting to obtain structural strength. Electric furnace ramming material is mainly used for the bottom of the electric furnace and other parts. It has the characteristics of high temperature resistance and wear resistance, and can extend the service life of the electric furnace.

[0003] With the increasing requirements of users for steel quality, steel mills have been improving comprehensive economic indicators such as the cost per ton of steel in recent years, and have continuously adopted new electric furnace steelmaking technology, which has put forward higher technical requirements for the use of electric furnace refractory materials. Traditional electric furnace ramming materials generally use magnesium calcium iron sand as the main raw material. This ramming material has the characteristics of being not resistant to corrosion, poor in erosion resistance, and easy to crack and peel during the application process, and can no longer meet the application requirements of existing electric furnace refractory materials. Summary of the invention

[0004] In order to overcome the defects of the prior art, the technical problem solved by the present invention is to provide an electric furnace ramming mass and a preparation method thereof. The ramming mass prepared by the method has good anti-erosion and anti-scouring capabilities.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An electric furnace ramming mass comprises the following components in parts by weight:

[0007] 60-80 parts of fused magnesia with a particle size of 4-1 mm;

[0008] 40-50 parts of fused magnesia with a particle size of 1-0 mm;

[0009] 20-30 parts of fused magnesia powder with a particle size of ≤0.074;

[0010] 5-10 parts of binder;

[0011] 3-5 parts of antioxidant;

[0012] 1 to 3 parts of carbon black.

[0013] The fused magnesia is 97 fused magnesia, and the mass percentage of magnesium oxide in the fused magnesia is ≥96%.

[0014] The antioxidant may be one or a mixture of metal silicon, metal aluminum and boron carbide.

[0015] The binder is brine and clay or a mixture of the two.

[0016] The weight ratio of the brine to the clay is 1:(2-4).

[0017] A method for preparing an electric furnace ramming mass comprises the following steps:

[0018] First, weigh and mix the ingredients according to the above ratio, mix the fused magnesia with a particle size of 4 to 1 mm, the fused magnesia with a particle size of 1 to 0 mm, and the fused magnesia powder with a particle size of ≤0.074, and stir evenly;

[0019] Then, add carbon black and antioxidant into the mixture and continue to stir evenly;

[0020] Finally, add the binder into the above mixture and stir until it is evenly mixed.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention adopts high-grade fused magnesia as the main material, which contains less impurities and has higher corrosion resistance. In addition, brine is used as the binder, which releases chlorine and generates MgO after molding, thereby improving the strength, fire resistance and anti-scouring performance of the material. DETAILED DESCRIPTION

[0023] The specific implementation mode of the present invention is further described below:

[0024] Example 1

[0025] This embodiment provides an electric furnace ramming material, comprising the following components in parts by weight:

[0026] 65 parts of fused magnesia with a particle size of 4 to 1 mm;

[0027] 42 parts of fused magnesia with a particle size of 1 to 0 mm;

[0028] 20 parts of fused magnesia powder with a particle size of ≤0.074;

[0029] 5 parts of binder;

[0030] 3 parts antioxidant;

[0031] 1 part of carbon black.

[0032] The fused magnesia is 97 fused magnesia, and the mass percentage of magnesium oxide in the fused magnesia is ≥96%.

[0033] The antioxidant may be one or a mixture of metal silicon, metal aluminum and boron carbide.

[0034] The binder is brine.

[0035] A method for preparing an electric furnace ramming mass comprises the following steps:

[0036] First, weigh and mix the ingredients according to the above ratio, mix the fused magnesia with a particle size of 4 to 1 mm, the fused magnesia with a particle size of 1 to 0 mm, and the fused magnesia powder with a particle size of ≤0.074, and stir evenly;

[0037] Then, add carbon black and antioxidant into the mixture and continue to stir evenly;

[0038] Finally, add the binder into the above mixture and stir until it is evenly mixed.

[0039] Example 2

[0040] This embodiment provides an electric furnace ramming material, comprising the following components in parts by weight:

[0041] 70 parts of fused magnesia with a particle size of 4 to 1 mm;

[0042] 45 parts of fused magnesia with a particle size of 1 to 0 mm;

[0043] 26 parts of fused magnesia powder with a particle size of ≤0.074;

[0044] 7 parts of binder;

[0045] 4 parts of antioxidant;

[0046] 2 parts of carbon black.

[0047] The fused magnesia is 97 fused magnesia, and the mass percentage of magnesium oxide in the fused magnesia is ≥96%.

[0048] The antioxidant may be one or a mixture of metal silicon, metal aluminum and boron carbide.

[0049] The binder is a mixture of brine and clay.

[0050] The weight ratio of the brine to the clay is 1:2.5.

[0051] A method for preparing an electric furnace ramming mass comprises the following steps:

[0052] First, weigh and mix the ingredients according to the above ratio, mix the fused magnesia with a particle size of 4 to 1 mm, the fused magnesia with a particle size of 1 to 0 mm, and the fused magnesia powder with a particle size of ≤0.074, and stir evenly;

[0053] Then, add carbon black and antioxidant into the mixture and continue to stir evenly;

[0054] Finally, add the binder into the above mixture and stir until it is evenly mixed.

[0055] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. In addition, the various different embodiments of the present invention can also be arbitrarily combined, as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. An electric furnace ramming material, characterized in that: Contains the following components in parts by weight: 60-80 parts of fused magnesia with a particle size of 4-1 mm; 40-50 parts of fused magnesia with a particle size of 1-0 mm; 20-30 parts of fused magnesia powder with a particle size of ≤0.074; 5-10 parts of binder; 3-5 parts of antioxidant; 1 to 3 parts of carbon black.

2. The electric furnace ramming material according to claim 1, characterized in that: The fused magnesia is 97 fused magnesia, and the mass percentage of magnesium oxide in the fused magnesia is ≥96%.

3. The electric furnace ramming material according to claim 1, characterized in that: The antioxidant may be one or a mixture of metal silicon, metal aluminum and boron carbide.

4. The electric furnace ramming material according to claim 1, characterized in that: The binder is brine and clay or a mixture of the two.

5. The electric furnace ramming material according to claim 4, characterized in that: The weight ratio of the brine to the clay is 1:(2-4).

6. A method for preparing an electric furnace ramming mass according to claim 1, characterized in that: The following steps are involved: First, weigh and mix the ingredients according to the above ratio, mix the fused magnesia with a particle size of 4 to 1 mm, the fused magnesia with a particle size of 1 to 0 mm, and the fused magnesia powder with a particle size of ≤0.074, and stir evenly; Then, add carbon black and antioxidant into the mixture and continue to stir evenly; Finally, add the binder into the above mixture and stir until it is evenly mixed.