Special carbon and graphite composite structure cathode carbon block of aluminum electrolytic cell

[0028] Example 1: Graphite electrode (1) is used as the conductive material part of the cathode carbon block along the length direction, which is built on the bottom of the cathode conductor to conduct horizontal current in the elongation direction of the cathode carbon block. The upper surface of the graphite electrode is used, etc. Slope design, slope downwards from the DC input end to the output end; the upper part of the graphite electrode uses resistivity ρ 2 Higher than graphite electrode resistivity ρ 1 The voltage-adjusting carbon layer (2) made of carbon, graphite or carbon-titanium boride material is constructed on the upper part of the graphite electrode (1) and the upper part of the resistive carbon layer using high-temperature adhesive conductive adhesive (3) The surface is a horizontal structure. According to the inverse relationship between the resistivity of the material and the length of the conductor according to Ohm’s law, the structure size of the cathode carbon block is determined, and the metal conductive connection piece is manufactured to enable the cathode carbon block to receive electricity from the upper surface to the bottom end of the cathode carbon block. (4) A special graphite carbon composite structure cathode carbon block for aluminum electrolytic cells with the same voltage drop V and uniform vertical current distribution. (Such as figure 1 , figure 2 Shown).

[0029] The cross section of the graphite carbon composite structure cathode carbon block for aluminum reduction cell and the cross section of the graphite electrode can be constructed into rectangles, circles, trapezoids, rectangles with rounded corners, and bumps.

[0030] Example 2: (e.g. image 3 , Figure 4 Shown) On the basis of Example 1, the basic shape of the graphite electrode (1) of the graphite carbon composite structure cathode carbon block for aluminum reduction cell remains unchanged, and the voltage adjustment carbon layer (2) adopts a mixture of graphite carbon and titanium boride The material tamping structure is on the upper part of the graphite electrode (1), which is used to improve the impact resistance and sodium corrosion resistance of the voltage adjustment carbon layer (2) on the upper part of the cathode carbon block. The side and bottom are made of ordinary high-resistance carbon Tamping paste tamping layer to improve the upper conductive performance of the cathode carbon block.

[0031] Example 3: (As shown in Figure 5, Image 6 Shown) The structure of the graphite electrode (1) of the special graphite carbon composite structure cathode carbon block for aluminum reduction cell is a truncated cone body, and its section changes at an equal slope along the length of the cathode carbon block, and its conductive section gradually moves from the end to the inside Increase. The outer diameter of the carbon layer (2) is unchanged by voltage adjustment constructed on the outside of the graphite electrode (1), and the structure of the cathode carbon block is determined according to the ratio of the material resistivity ρ, the conductive section S and the conductor length L of Ohm’s law The size, the voltage drop V equivalent from the outer surface of the cathode carbon block to the metal conductive connector at the end of the cathode carbon block, and the uniform vertical current A distribution around the circle are manufactured for the special graphite carbon composite structure cathode carbon block for aluminum electrolytic cells.