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Assembling method capable of preventing cracks of graphite phosphorus pig iron cast carbon blocks

A casting and assembly method of phosphorus pig iron, which is applied in the field of aluminum electrolysis, can solve problems such as cracks at the corners of steel rod grooves, differences in thermal expansion coefficients between steel rods and carbon blocks, and poor thermal conductivity, so as to improve current efficiency, improve current distribution, Good effect of promoting application value

Active Publication Date: 2012-06-13
YUNNAN ALUMINUM +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the difference in quality and poor thermal conductivity of graphite carbon blocks, there is a large difference in thermal expansion coefficient between steel rods and carbon blocks, coupled with the influence of the self-weight stress of steel rods, traditional assembly methods, due to stress concentration, lead to graphite phosphorus pig iron The problem of cracks at the casting point of the cast carbon block and the corner of the groove of the steel rod is a technical problem

Method used

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  • Assembling method capable of preventing cracks of graphite phosphorus pig iron cast carbon blocks
  • Assembling method capable of preventing cracks of graphite phosphorus pig iron cast carbon blocks
  • Assembling method capable of preventing cracks of graphite phosphorus pig iron cast carbon blocks

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Effect test

Embodiment 1

[0016] According to the structural size of the cathode carbon block and the distribution requirements of the cathode current, the assembly method of the two-stage steel rod structure cathode carbon block is (such as Figure 4-6 As shown), two sections of round steel 6 are placed at the bottom of the middle position of the groove of carbon block 1, and 350-550mm paste is made at the bottom of both ends, and a gap of 30-50mm is reserved in the middle position of the two sections of steel rod 2. A non-conductive area of ​​80-100 mm is set in the middle of the groove, and asbestos wool 5 is used as filling material at the cut-off position of casting of carbon block and steel rod to realize free expansion and contraction of the steel rod in the length and width direction.

Embodiment 2

[0018] The assembly method of cathode carbon block with long steel rod structure is (such as Figure 7-9 As shown), 200-250mm long flexible connection areas are respectively set at the two ends of the cathode carbon block 1, the bottom pad is made of paste, and the gap between the carbon block and the steel rod 2 at the corresponding position of the bottom pad is filled with asbestos wool, which is effective To avoid the problem of thermal stress concentration, two sections of round steel 6 are arranged at the bottom of the middle position of the carbon block groove. The diameter of the round steel is equal to the height of the bottom pad, so as to realize the free expansion and contraction of the steel rod in the length and width directions. After the phosphorus pig iron 4 is cooled, it is connected flexibly The area is filled with paste.

Embodiment 3

[0020] The assembly method of the cathode carbon block with unequal length steel rod structure is that two steel rods and two grooves are respectively used with one long steel rod and one short steel rod, staggering the thermal stress concentration position, dislocation arrangement, and the interface is arranged in the casting process of phosphorus pig iron areas of thermal stress concentration (such as Figure 10-12 As shown), there is a gap of 30-50 mm at the joints of the long and short steel rods, and the length of the two ends of the cathode carbon block 1 is set within the range of 80-100 mm. After the phosphorus pig iron 4 is cooled, it is filled with paste.

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Abstract

The invention relates to an assembling method capable of preventing cracks of graphite phosphorus pig iron cast carbon blocks. The assembling method of cathode carbon blocks with a two-segment steel bar structure comprises the steps of: arranging a two-segment round steel at the bottom of the middle position of the groove of each carbon block, arranging 350-550 mm paste at the bottoms of two end parts, reserving 30-50 mm of gaps at the middle positions of the two segments of steel bars, arranging a segment of 80-100 mm non-conductive area at the middle position of the groove of each steel bar, and using asbestos wool as a filling material at the casting stop positions of the carbon block and steel bars, so as to realize free expansion and shrinkage of the steel bars in the length and width directions. The invention also relates to an assembling method of cathode carbon blocks with a full-length steel bar structure and the cathode carbon blocks with an unequal-length steel bar structure. According to the assembling method provided by the invention, the cracking problem of the carbon blocks caused by poor thermal conductivity and other heat stress performances of the graphite cathode carbon blocks are effectively solved, the current distribution is improved, the current efficiency is improved and the assembling method has excellent popularization and application value.

Description

[0001] technical field [0002] The invention relates to the technical field of aluminum electrolysis, in particular to an assembly method for solving cracks in cast carbon blocks of graphite phosphorus pig iron. Background technique [0003] The assembly method of graphitized traditional phosphorus pig iron cast cathode carbon block at home and abroad ( figure 1 ), two cathode steel rods are generally used, the distance between the two cathode steel rods is 200-300mm, and the gap between the cathode steel rod and the carbon block is made of paste. Due to the difference in quality and poor thermal conductivity of graphite carbon blocks, there is a large difference in thermal expansion coefficient between steel rods and carbon blocks, coupled with the influence of the self-weight stress of steel rods, using traditional assembly methods, due to stress concentration, resulting in graphite phosphorus pig iron The problem of cracks at the casting point of the cast carbon block a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/08B22D19/04
Inventor 杨叶伟丁吉林刘志祥何跃贵高显宏熊自勇张大信王新华赵瑞敏刘永强李俊张国红赵德忠王永戴沪华何玉鸿
Owner YUNNAN ALUMINUM