Crust-hitting hammer head for aluminum reduction cell and casting technique thereof

Abstract

The invention provides a material and a structure of a crust-hitting hammer head for an aluminum reduction cell and a casting technique thereof. The hammer head is prepared from rare earth high-chromium cast iron, and comprises the following components in percentage by weight: 1.5-2.5 percent of carbon, 0.5-1.5 percent of silicon, 0.20-1.5 percent of manganese, 25.0-35.0 percent of chromium, less than 0.05 percent of phosphorus, less than 0.05 percent of sulfur, 0.075-0.10 percent of mixed rare earth, not more than 1 percent of other impurities and the balance of iron. The crust-hitting hammer head has the structure that a steel pipe is cast in a hammer head body, and the front segment of the steel pipe and the hammer head body are cast into a whole, wherein a connection reinforcing hole is arranged at the front segment of the steel pipe; a common part of the middle segment of the steel pipe and the hammer head body forms a segment of hollow cavity; and the part of the steel pipe extending out of the chip body and a crust-hitting rod are sleeved and then fixed together through ring welding and notched welding. The technique adopts a top casting or side casting method. The crust-hitting hammer head has the characteristics of heat resisting property, corrosion resisting property, wear resisting property, light weight, falling prevention, strong technological adaptability, easy production and the like.

Description

technical field [0001] The invention belongs to the technical field of aluminum smelting, and in particular relates to the material composition, structure and casting technology of a hammer head used for a shelling device produced by aluminum electrolysis. Background technique [0002] During the aluminum electrolysis process, the sheller opens the shell of the electrolyte for a certain period of time, replenishes a certain amount of alumina and aluminum fluoride, and maintains the concentration of alumina in the electrolyte and the molecular ratio of the electrolyte, so that the electrolysis process can continue to be carried out efficiently. The shelling machine is composed of three parts: a shelling rod, a shelling cylinder, and a shelling hammer. The shelling rod connects the shelling cylinder and the shelling hammer, and the shelling hammer and the shelling rod are connected by welding. People have taken many measures in order to reduce hammer consumption, improve the q...

AI Technical Summary

Problems solved by technology

[0003] ①The shelling hammer head is subjected to wear, corrosion and high temperature during the shelling process. Currently, the hammer head forged by Q235 and cast by ZG235 does not contain corrosion-resistant, wear-resistant, and high-temperature-resistant alloy elements, and its service life is only 3 to 4 months, high material consumption, high replacement frequency, poor working environment, and high labor intensity

[0004] ②The iron in the hammer head enters into the aluminum liquid, so that the iron element in the aluminum exceeds the standard, and the quality of the aluminum liquid decreases

[0006] ④ The currently used Q235 forging and ZG235 casting hammers have low cost and short service life; while hammers with high alloy element content have a long service life, but the cost of containing precious metals is high, resulting in low cost performance of the hammer

[0007] ⑤The hammer head material itself has a wide solidification temperature range, which is prone to shrinkage and porosity, and the hammer head is not dense

The end of the hammer head of the above two patents is welded to the shelling rod in a flat surface, and the bonding strength is low, which may easily cause the hammer head to fall off, and the hammer head is heavy.

Generally speaking, although the hammer head is made of heat-resistant, corrosion-resistant and wear-resistant steel, they are all national standard metal materials, which may not be completely suitable for the environment of aluminum electrolysis; The process is complicated, and it is easy to produce casting defects, which affects the life of the hammer head and reduces the cost performance

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