Aluminum electrolytic tank anode carbon block of irregularly-shaped structure with exhaust passage and preparation method thereof

Abstract

An aluminum electrolytic tank anode carbon block characterized by edges of top surface carbon block are provided with chamfers, a row or two rows of carbon bowls are uniformly distributed on the top surface. Each row of carbon bowls are longitudinally arranged along the anode carbon block and consist of 3 to 5 carbon bowls. Grooves are formed among the carbon bowls, the bottom of the anode carbon block is provided with trenches, and the bottom of each groove is provided, with through holes which are in communication with the trenches. The preparation method includes: preparing the carbon block by using a vibration mold or compression mold with corresponding bumps by a vibration molding method or a compression molding method; and roasting and then cutting out the trenches. The anode carbon block has the characteristics of a simple and convenient preparation process, high working efficiency and the like.

What is claimed is: 
     
         1 . An aluminum electrolytic tank anode carbon block of an irregularly-shaped structure with an exhaust passage, edges of a top surface of the anode carbon block provided with chamfers, a row or two rows of carbon bowls uniformly distributed on the top surface, and each row of carbon bowls longitudinally arranged along the anode carbon block and consisting of 3 to 5 carbon bowls,
 wherein grooves are formed among the carbon bowls, and a bottom of the anode carbon block is provided with trenches; a bottom of each groove is provided with through holes which are in communication with the trenches in the bottom of the anode carbon block.   
     
     
         2 . The aluminum electrolytic tank anode carbon block of the irregularly-shaped structure with the exhaust passage of  claim 1 , wherein a row of carbon bowls are arranged on the top surface of the anode carbon block, a transverse groove is formed between every two adjacent carbon bowls; or two rows of carbon bowls are arranged on the top surface of the anode carbon block, a longitudinal groove is formed between the two row of carbon bowls, or a transverse groove is formed between every two adjacent carbon bowls in the same row, or these two kinds of grooves coexist. 
     
     
         3 . The aluminum electrolytic tank anode carbon block of the irregularly-shaped structure with the exhaust passage of  claim 1 , wherein the trenches are in the bottom of the anode carbon block in positions corresponding to each groove, the bottom of each groove is provided with at least one through hole which is in communication with the trench corresponding to the groove. 
     
     
         4 . The aluminum electrolytic tank anode carbon block of the irregularly-shaped structure with the exhaust passage of  claim 2 , wherein an axis of the transverse groove is vertical to the longitudinal axis of the anode carbon block, the axis of the transverse groove is in a middle of two adjacent carbon bowls in the longitudinal direction of the anode carbon block, and both ends of the transverse groove extend to the chamfers of two long edges; the axis of the longitudinal groove runs parallel to the axis of the anode carbon block, the longitudinal groove is in the middle of two adjacent rows of carbon bowls in the longitudinal direction of the anode carbon block, and both ends of the longitudinal groove extend to the chamfers of two short edges. 
     
     
         5 . The aluminum electrolytic tank anode carbon block of the irregularly-shaped structure with the exhaust passage of  claim 1 , wherein the top of each trench is 20 to 50 cm below the top of the anode carbon block, the bottom of each trench is in communication with the bottom surface of the anode carbon block, and the width of each trench is 1.0 to 3.5 cm. 
     
     
         6 . The aluminum electrolytic tank anode carbon block of the irregularly-shaped structure with the exhaust passage of  claim 1 , wherein a cross section of each groove is an inverted isosceles triangle or an inverted isosceles trapezoid, and a height of each groove is 3 to 10 cm, when the cross section of each groove is an inverted isosceles triangle, the width of the top surface of each groove is 3 to 10 cm, when the cross section of each groove is an inverted isosceles trapezoid, the width of the top surface of each groove is 5 to 10 cm, and the width of the bottom surface is 3 to 8 cm. 
     
     
         7 . The aluminum electrolytic tank anode carbon block of the irregularly-shaped structure with the exhaust passage of  claim 1 , wherein the through holes are in the bottom of each groove, and the longitudinal axis of each through hole is vertical to the bottom surface of the anode carbon block. 
     
     
         8 . The aluminum electrolytic tank anode carbon block of the irregularly-shaped structure with the exhaust passage of  claim 1 , wherein the through holes include small through holes and large through holes, the cross section of each small through hole is circular, oval., square or rectangular, with an area of 3 to 18 cm 2 ′ when the cross section of the small through hole is square or rectangular, four corners of the square or rectangle are filleted corners, the cross section of each large through hole is rectangular, with an area of 18 to 500 cm 2 . 
     
     
         9 . The aluminum electrolytic tank anode carbon block of the irregularly-shaped structure with the exhaust passage of  claim 1 , wherein when a length of each through hole is equal to the length of the anode carbon block, the through holes are in communication with the trenches, and one anode carbon block is longitudinally divided into two identical small anode carbon blocks. 
     
     
         10 . A preparation method for the aluminum electrolytic tank anode carbon block of the irregularly-shaped structure with the exhaust passage of  claim 1 , the method comprising: preparing a green body of the anode carbon block by a vibration molding method or a compression molding method; when the vibration molding method is used, the lower surface of the upper weight dropper in a vibration mold is provided with corresponding bumps; when the compression molding method is used, the lower surface of the upper mold core in a compression mold is provided with corresponding bumps; preparing carbon bowls, grooves and deep holes with a depth of 20 to 50 cm in the green body of the anode carbon block during vibration molding or compression molding; after demolding and cooling down, putting the green body of the anode carbon block into a roasting furnace with 1100 to 1300° C. to prepare a roasted body of the anode carbon block with carbon bowls, deep holes and grooves in the top; and physically cutting out the trenches in the bottom of the roasted body of the anode carbon block and making the trenches be in communication with the deep holes or a groove-shaped passage to form the through holes, thus the aluminum electrolytic tank anode carbon block of the irregularly-shaped structure with the exhaust passage is prepared, the corresponding bumps refer to the bump structures corresponding to the positions of the carbon bowls, grooves and through holes in the anode carbon block.