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Rotary hearth furnace bottom and rotary hearth furnace with same

A technology for the bottom and base of a rotary hearth furnace, which is applied in the chemical industry, can solve the problems of damage to the bottom structure, easy bonding between slag and the bottom of the furnace, and failure to tap iron and slag smoothly, so as to reduce erosion, ensure safe operation, and enhance Antioxidant effect

Active Publication Date: 2014-03-26
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Description
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  • Application Information

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Problems solved by technology

[0004] As the core equipment of the Itmk3 process, the rotary hearth furnace mainly carries the reaction on the lower rotating annular hearth, so the requirements for the structure of the refractory material at the bottom of the rotary hearth furnace are also relatively high, and the production of granulated iron requires a higher temperature, about 1400°C ~1500°C, the granular iron production process needs to be carried out in a reducing atmosphere. This process is a semi-melting process of slag and iron. The melting of slag and iron will corrode the bottom of the furnace. , damage the furnace bottom structure

Method used

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  • Rotary hearth furnace bottom and rotary hearth furnace with same
  • Rotary hearth furnace bottom and rotary hearth furnace with same

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Embodiment

[0039] Bottom of rotary hearth furnace: 6 layers in total, with a total thickness of 650mm. Such as figure 2 Shown from top to bottom are: the first layer is the poured slag-resistant casting layer (including two equal-thickness slag-resistant casting sub-layers), the thickness is 154mm; the second layer is the standard high-alumina brick Lz- 55; the third layer is a standard clay brick N-3a with a thickness of 136mm; the fourth layer is a standard lightweight clay brick with a thickness of 272mm (the thickness of the standard light clay brick is 136); the fifth layer is a refractory fiberboard with a thickness of 20mm.

[0040] The slag-resistant casting layer is formed by the following materials: alumina accounts for 55% by weight of the mixture, brown corundum accounts for 20% by weight of the mixture, silicon carbide accounts for 15% by weight of the mixture, and silicon nitride accounts for 4% by weight of the mixture. Metal silicon powder accounts for 2% by weight of t...

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Abstract

The invention discloses a rotary hearth furnace bottom and a rotary hearth furnace with the same. The rotary hearth furnace bottom comprises a base and an anti-slag pouring layer, wherein the anti-slag pouring layer is formed on the upper surface of the base and comprises bauxite, brown fused alumina, silicon carbide, graphite, a carbon oxidant and a binding agent. The rotary hearth furnace bottom can effectively solve the problems of agglutination and erosion to the furnace bottom by crap iron in slag at a high temperature, thereby avoiding unsafe hidden troubles including breakdown of the rotary hearth furnace bottom and the like.

Description

technical field [0001] The invention relates to the field of chemical industry, more specifically, the invention relates to the bottom of a rotary hearth furnace and the bottom of the rotary hearth furnace. Background technique [0002] Blast furnace ironmaking requires coking and sintering processes that pre-process coal and iron ore, and combined steelworks need to be scaled up to increase efficiency. Therefore, there is a lack of resource flexibility and production flexibility. The direct reduction ironmaking method is a process using natural gas, so the site is limited to areas that produce cheap natural gas. [0003] Therefore, the ironmaking process using abundant fine ore resources and ordinary coal as raw materials has attracted attention. In 1995, during the development of the FASTMET process, it was discovered that metallic iron and slag could be separated even if they were only heated for 10 minutes. The idea of ​​using this reaction principle as a process is th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/10C04B35/66
Inventor 吴道洪王敏曹志成薛逊
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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