Atomic Theory for Students of Metallurgy by W Hume-Rothery

By W Hume-Rothery

This publication offers vintage introductions to the electron idea of metals.

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28) serves to connect the anode blocks with the anode rods that feed electric current to the cells. The pins are first coated with graphite. The coating is then allowed to dry. The six stub holes in the anodes are heated to eliminate any moisture being present in the holes prior to casting (Fig. 29). Finally, the anode blocks can be aluminum-sprayed before being ready for use. For proper functioning, the anode rod requires a reliable steel7aluminum transition joint, connecting the steel stub assembly with the aluminum anode rod.

2 Cell Arrangement Since each cell takes a large current at low voltage, a number of cells (1207168) are arranged in series. The line voltage may be up to 800 V, and cell amperages 34,0007130,000 A. Figure 24 shows the electrical connections to one type of electrolytic cells. 30 Habashi Figure 23 Carl Wilhem So¨derberg (187671955) invented the self-baking anode for the aluminum electrolytic cell. 4 In prebaked electrode cells, alumina feeding is more frequent and in smaller quantities through the center break-and-feed system which is composed of a volumetric alumina metering section and a mechanism for punching a hole in the crust.

1 Spent Potlining After a certain period of operation, the graphite which acts as cathodes deteriorates and has to be replaced. This is done by interrupting the operation, draining the electrolyte, allowing to cool, then replacing the blocks. The material removed is referred to as spent potlining and represents a large volume of solid waste. This material is hazardous because of its cyanide content that is mostly watersoluble (Table 11). The cyanide forms as a result of air leaks in the cell whose nitrogen content reacts with carbon at the high temperature of the operating cell.

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