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The new aluminum reduction cell must be preheated and burned before being put into production(best aluminium oxide powder suppliers portugal). Large pre culture electrolyzers now mostly use double anode carbon block group, and an air guide tank is opened at the bottom of the carbon block to facilitate the escape of anode gas(fine grit aluminum oxide). The allowable deviation of overall dimension of anode carbon block shall meet the requirements listed in the table. 

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Increasing the diameter and insertion depth of the steel claw can reduce the voltage drop and heat dissipation, but increase the material consumption and anode residual rate of the steel claw(best aluminium oxide powder suppliers portugal). The continuous length of cracks in the rod hole or along the hole edge shall not be greater than 80mm, and there shall be no connecting cracks between holes(220 grit aluminum oxide blast media). There are 4 claws and 3 claws on each anode block.

The depth of the concave defect on the bottom surface of the rod hole of an enterprise is no more than 12mm, and the defect area is no more than two-thirds of the bottom surface(aluminium oxide sand). The crack length on the top surface of the molten block shall not be greater than 150mm, and the side crack length shall not be greater than 300mm (the combined calculated length of cross edge cracks)(best aluminium oxide powder suppliers portugal). It can be cooled quickly below 800 ℃. 

Because the bent and uneven surface of the guide rod is easy to cause the clamping fixture not tight when changing the pole or the guide rod when lifting the bus(alumina grit), the non straightness of the aluminum guide rod in the length direction shall not be greater than 15mm, the surface shall be straight and smooth, without oxide film, pitted surface and concave convex phenomenon, and the accuracy grade shall reach grade 8(best aluminium oxide powder suppliers portugal).

If the recovered guide rod is bent, it shall be straightened, the steel claw shall be polished, and it can be used after passing the inspection(aluminium oxide shot blasting grit). The steel claw and claw frame are made of cast carbon steel(best aluminium oxide powder suppliers portugal). The current density of the steel claw is selected as 0.1a/mm, and the cross-sectional area of the steel claw is calculated through the current intensity(aluminium oxide blasting media). There is no obvious oxidation defect, burst and bending on the surface.

Except that the strength and geometric dimensions meet the process requirements, they all play the role of conducting current(best aluminium oxide powder suppliers portugal). The smaller the resistance, the better. The purpose of preheating the electrolytic cell is to drive away the moisture in the lining material of the electrolytic cell and dry it through slow heating for a period of time(aluminum oxide blasting grit). The welding between aluminum and steel shall be intact without open welding. 

The diameter of the carbon bowl is 30 ~ 40mm larger than the diameter of the steel claw, and the depth of the carbon bowl is 15mm deeper than the insertion depth of the steel claw(best aluminium oxide powder suppliers portugal). Ferrophosphate pouring shall be full and flat without ash and bubbles(glass bead abrasive). The anode guide rod shall be recycled for 40-60 cycles, and the guide rod on the residual anode shall be recycled and renewed, and the residual electrode shall be treated.

Preparation of steel claw, claw frame and explosive welding strip(aluminum oxide blasting abrasive). The aluminum plate surface is then welded with the aluminum guide rod, and the steel plate surface is then welded with the claw frame head(best aluminium oxide powder suppliers portugal). Therefore, reducing the resistivity of anode material is very important to reduce the production cost of aluminum. The resistivity of anode carbon block shall not be greater than 60u2 · M(aluminum oxide abrasive media). Sufficient mechanical strength.

Then, the anode steel claw is poured into the carbon bowl of the anode carbon block with phosphorus pig iron(best aluminium oxide powder suppliers portugal). The composition of phosphorus pig iron for casting is shown in the table. Appearance requirements: the boundary shall be free of crack, and the plate surface shall be flat without deformation(steel shot abrasive). The standard mainly includes the following aspects: the overall dimension of anode carbon block is reasonable. 

The working temperature of aluminum steel explosive welding block shall not exceed 400 ℃(240 grit aluminum oxide). Therefore, the explosive welding strip is required to have high mechanical strength and the interface bending shear strength shall not be less than 70MPa; It is required that the smaller the surface contact resistance, the better, the interface bonding rate reaches 100%, and the interface resistance is not greater than 0.2 μ Ω/em(best aluminium oxide powder suppliers portugal).

In this way, the anode guide rod is connected with the anode carbon block to form an anode carbon block group(best aluminium oxide powder suppliers portugal). Recently, aluminum core steel claw and claw frame for ladle have been invented in China, which are being popularized and applied. The length of anode carbon block must meet the width of electrolytic cell chamber and the distance between two web beams on the upper part of the cell(corundum sand). Anode assembly.

What are the requirements for the appearance and properties of pre flame anode carbon block and anode group(garnet blasting media)? In addition to the physical and chemical indexes of the pre cultured anode, there are also strict requirements for the appearance of the anode carbon block, but there is no unified standard in China(best aluminium oxide powder suppliers portugal). When cooling from the maximum temperature to 800 ℃, the cooling speed shall be properly controlled(alumina blasting).

What are the purposes and requirements of preheating and melting of aluminum reduction cell(best aluminium oxide powder suppliers portugal)? As the anode guide rod plays the role of conducting current and suspending anode carbon block group, it is required to have good conductivity and regular geometric shape and certain mechanical strength(150 grit aluminum oxide). The falling off defect at the upper edge of each rod hole shall not be greater than 80mm × 30mm, not more than one.

If the width of anode carbon block is too narrow, increase the number of anode groups and pole changing times(best aluminium oxide powder suppliers portugal); Therefore, if the anode carbon block is too wide, the horizontal current and heat dissipation in the carbon block will increase, which will also hinder the escape of anode gas and reduce the current efficiency(aluminium oxide sandblasting grit). Component welds shall not be desoldered, and explosive welding pieces shall not be slotted.

The off calibration angle shall not be greater than 100mm × 100mm, the length of edge falling shall not be greater than 300mm, the depth shall not be greater than 60mm, and the number shall not be more than two(best aluminium oxide powder suppliers portugal). The explosive welding strip is made of aluminum plate and steel plate by explosive welding(silicon carbide grit). Connect the aluminum guide rod and claw frame head through aluminum steel explosive welding strip.

If the anode height is too high(1200 grit aluminum oxide), the voltage drop of the anode itself will increase, the heat dissipation capacity of the upper part of the anode will also increase, the height of the anode carbon block will increase too much, and the anode bus and the gate support of the electrolytic cell will also increase, which will increase the upper structure of the electrolytic cell and the cost of the plant(aluminium oxide blasting grit). Residual electrode treatment(best aluminium oxide powder suppliers portugal).

Therefore, it is required that the less impurity elements in the cast steel, the better, and there shall be no defects such as pores, sand holes, slag inclusions and cracks(best aluminium oxide powder suppliers portugal). The length of steel claw shall not be less than 260mm, the deviation of each steel claw from the center line shall not be more than 10mm, the diameter of steel claw shall not be less than 135mm, and the thickness of cast iron ring shall not be less than 10mm(aluminum oxide grit blasting).

The whole production process of aluminum electrolysis is divided into three stages: sintering, start-up and normal production(silicon carbide powder). If the specified anode height is too low, the pole will be changed frequently, which will interfere with the normal production of the electrolytic cell, increase the labor intensity and increase the anode residual rate(best aluminium oxide powder suppliers portugal). The anode carbon block group can be divided into single anode and double anode(alumina abrasive powder).