Low-chrome refractory material RH refining furnace and building method thereof

A refractory material and refining furnace technology, applied in the field of refining equipment outside the steel furnace, can solve the problems of repairing and replacing a large amount of time, high construction costs, and environmental pollution of magnesia-chrome bricks, so as to reduce damage to the human body and the environment and improve the use of Efficiency and the effect of reducing the cost of masonry

Inactive Publication Date: 2014-03-12
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process not only requires high technical proficiency of on-site construction personnel, but also uses a large number of magnesia-chrome bricks to pollute the environment, and the construction cost is also high, and it takes a lot of time to repair and replace during use. This high cost, high pollution and low efficiency The masonry method needs to be improved urgently

Method used

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  • Low-chrome refractory material RH refining furnace and building method thereof
  • Low-chrome refractory material RH refining furnace and building method thereof
  • Low-chrome refractory material RH refining furnace and building method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The RH refining furnace of embodiment 1 is as Figure 1~2 As shown, it is mainly composed of a hot bend pipe 1, an upper tank 2, a middle tank 3, a lower tank 4, a circulating pipe 5 and a dipping pipe 6 arranged sequentially from top to bottom. Among them, the hot bending pipe 1 has the hot bending pipe working layer 1a and the hot bending pipe permanent layer 1b, the upper groove 2 has the upper groove working layer 2a and the upper groove permanent layer 2b, and the middle groove 3 has the middle groove working layer 3a and the middle groove permanent layer 2b. Layer 3b, lower tank 4 has a lower tank working layer 4a and a lower tank permanent layer 4b. The refractory materials and masonry techniques used in the above parts are as follows:

[0047] The hot bending pipe working layer 1a, the upper groove permanent layer 2b, the middle groove permanent layer 3b and the lower groove permanent layer 4b are all made of magnesia spinel unfired bricks, and the hot bending ...

Embodiment 2

[0063] The composition and masonry method of the RH refining furnace of embodiment 2 are basically the same as those of embodiment 1, and the existing differences are as follows:

[0064] Its corundum spinel prefabricated brick or castable is composed of the following raw materials in weight ratio:

[0065] Tabular alumina with a particle size of 0.088~12mm accounts for 65%;

[0066] Magnesium-aluminum spinel with a particle size of ≤0.074mm accounts for 30%;

[0067] Cement with particle size ≤0.088mm accounts for 2%;

[0068] Metal aluminum powder with particle size ≤0.088mm accounts for 1%;

[0069] Polypropylene fiber with a length of 2~10mm accounts for 1%;

[0070] Sodium hexametaphosphate accounted for 1%.

[0071] The specific material usage of embodiment 2 is shown in table 2.

[0072] Table 2 Table of materials used for each component of the RH refining furnace in Example 2

[0073]

Embodiment 3

[0075] The RH refining furnace composition and masonry method of embodiment 3 are also basically the same as embodiment 1, and the differences are as follows:

[0076] Its corundum spinel prefabricated brick or castable is composed of the following raw materials in weight ratio:

[0077] White corundum with a particle size of 0.088~12mm accounts for 85%;

[0078] Fused magnesia with particle size ≤0.074mm accounted for 30%;

[0079] Cement with particle size ≤0.088mm accounted for 3.9%;

[0080] Metal aluminum powder with particle size ≤0.088mm accounts for 0.5%;

[0081] Polyvinyl alcohol fibers with a length of 2~10mm account for 0.5%;

[0082] Sodium tripolyphosphate accounted for 0.1%.

[0083] The specific material usage of embodiment 3 is shown in table 3.

[0084] Table 3 Material usage list of each component of the RH refining furnace in Example 3

[0085]

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Abstract

The invention discloses a low-chrome refractory material RH refining furnace and a building method thereof. A hot bent pipe working layer, an upper tank permanent layer, a middle tank permanent layer and a lower tank permanent layer are built with magnesia spinel unburned bricks; a hot bent pipe working layer is built with clay bricks; an upper tank working layer and a middle tank working layer are built with corundum spinel precast bricks; a lower tank working layer is divided into two sections: the triangular region A at the joint of the bottom and a circulating pipe is built with magnesia-zirconia bricks, magnesia-zirconia-titania bricks or magnesia-chrome bricks with the chrome content of less than 20%, and the part above the triangular region A is built with magnesia spinel unburned bricks; the circulating pipe is built with magnesia-zirconia bricks, magnesia-zirconia-titania bricks or magnesia spinel bricks; and a dip pipe is integrally cast with a corundum spinel casting material. By reducing the use of the chrome-containing refractory material, the invention reduces the damage of toxic substances on the human body and environment, enables the RH refining furnace to be easily repaired and quickly replaced, enhances the service efficiency of the dip pipe, and lowers the building cost of the RH refining furnace.

Description

technical field [0001] The invention belongs to the technical field of refining equipment outside a steel furnace, and relates to an RH refining furnace, in particular to a low-chromium refractory RH refining furnace, and also relates to its masonry method. Background technique [0002] The RH (Molten Steel Vacuum Circulation Degassing) process was jointly developed by Ruhrstahl and Heraeus in 1959 and has a history of 50 years. RH refining furnace device such as figure 1 As shown, it is mainly composed of vacuum chamber, dipping pipe (rising pipe, descending pipe), vacuum exhaust pipe, alloy silo, lifting device, argon blowing pipe system and vacuum chamber preheating device. The main purpose of the initial development is to dehydrogenate molten steel to prevent white spots in the steel, so it is only used to process steels that have strict requirements on gas, such as thick plate steel, steel for large forgings, silicon steel and bearing steel etc., its scope of applicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27D1/04
CPCY02P10/134
Inventor 田先明胡四海洪学勤雷中兴周辉龚仕顺刘良兵徐超王忠
Owner 武钢集团有限公司
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