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Pressurization type steam-aging device

A technology of aging device and pressurized steam, which is applied in the field of lime calcination to reduce the frequency of equipment maintenance and improve the aging efficiency

Active Publication Date: 2019-04-26
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] However, even with the aging method of Patent Document 4, a reduction in aging efficiency due to clogging of pores and the like cannot be avoided.

Method used

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Embodiment Construction

[0065] The present inventors conducted intensive studies on suppressing the frequency of equipment maintenance and improving aging efficiency in a pressurized steam aging apparatus. As a result, the following findings were obtained.

[0066] Such as Figure 10A , Figure 10B As in the prior art shown, when the holes 205a for ejecting steam are formed in the pipes 205 arranged in the longitudinal direction, the steelmaking slag in the vicinity of the holes 205a exists at a high filling degree. In this case, steam is prevented from being ejected from the hole 205a. In addition, there is the attendant risk of clogging of the hole 205a. Therefore, if the steam hole is formed on the side of the vertically standing branch pipe, the steelmaking slag dropped from above collides with the upper part of the pipe, and the filling degree of the steelmaking slag near the hole can be reduced. As a result, steam can be efficiently ejected from the holes, and clogging can be prevented.

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Abstract

A pressurization type steam-aging device for performing pressurization type steam-aging on steel slag by using pressurized steam is provided. The device includes a slag accommodation vessel, a pressure vessel, first piping, and second piping. The second piping comprises a main pipe part and a branch pipe part having jet orifices formed in the side surface thereof. Taking H (mm) to be the dimensionin the height direction of an accommodation region of the slag accommodation vessel, the jet orifices are disposed in a height direction region of 0.3*H to 0.6*H in the accommodation region.

Description

technical field [0001] The present invention relates to a pressurized steam aging device for aging steelmaking slag containing unresidue lime (also called free lime) discharged from a converter, an electric furnace, etc., using pressurized steam for a short time. [0002] This application claims priority based on Patent Application No. 2017-011870 for which it applied in Japan on January 26, 2017, and uses the content here. Background technique [0003] The steelmaking slag produced in the steelmaking process is hard and its surface has an angular shape, so it fits well during road rolling and has excellent properties as a roadbed material. [0004] However, in the steelmaking slag, a part of quicklime used as a dephosphorization agent and a desulfurization agent is not completely combined with other molecules, and remains in the state of unsludged lime. [0005] Therefore, when the steelmaking slag is used as it is as a roadbed material, hydration reaction occurs over time...

Claims

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Application Information

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IPC IPC(8): C04B5/00C21C5/28F27D15/00
CPCC04B5/00C21C5/28F27D15/00
Inventor 浜崎拓司神保正人森下茂
Owner NIPPON STEEL CORP
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