Method for replacing filter plate of aluminum liquid filter basin

Abstract

The invention discloses a method for replacing a filter plate of an aluminum liquid filter basin. The method comprises the following steps that A, after casting of the filter plate to be replaced is finished, a top cover of the aluminum liquid filter basin is hung off, and dross on the surface of the aluminum liquid remained above the filter plate is cleaned; B, an emptying hole at the bottom of the aluminum liquid filter basin is opened, and residual aluminum liquid above and below the filter plate is drained; C, pressing blocks are removed in a hot state, a through hole with the diameter of50-70mm is formed in the filter plate, high-pressure air is input into the aluminum liquid filter basin through the through hole, and the temperature is forced to be decreased to 100 DEG C or below; D, the filter plate is hung out of the aluminum liquid filter basin, an inner cavity of the aluminum liquid filter basin is cleaned again, and the inner wall of the aluminum liquid filter basin is coated with a boron nitride releasing agent; E, a new filter plate is installed in the aluminum liquid filter basin, the pressing blocks are placed on the preheated filter plate, the top cover is closed,and an electric heating pipe is used for gradual heating and preheating; and F, 5-15 min before next casting, and open fire is used for baking the filter plate to 700 DEG C or above for filtering aluminum liquid in a heat insulation furnace in the casting process.

Description

technical field [0001] The invention relates to the field of aluminum processing, in particular to a method for replacing a filter plate of a liquid aluminum filter basin. Background technique [0002] When aluminum processing enterprises process ingots, the liquid aluminum in the holding furnace is qualified, filtered by the liquid aluminum filter basin, and then sent to the casting machine to be processed into ingots. [0003] The molten aluminum filter basin is mainly used to filter and remove the impurities of the molten aluminum in the holding furnace. There is a filter plate placed in the molten aluminum filter basin, and a compact is placed on the filter plate to prevent the filter plate from floating in the molten aluminum. After the last batch of casting is finished, the filter plate needs to be replaced to ensure the quality of the next batch of molten aluminum. [0004] At present, the operation method of replacing the filter plate in the liquid aluminum filter b...

AI Technical Summary

Problems solved by technology

In this way, due to the high temperature of the operating environment and the incomplete solidification of the residual aluminum liquid, the inner cavity of the filter basin cannot be completely cleaned, which is likely to cause slag inclusion and secondary pollution in the next casting aluminum liquid. The thicker the slag, the slag will gradually sinter, and the filter plate cannot be installed normally after a period of use, so it can only be scrapped.

In addition, the temperature of the refractory material and filter plate in the molten aluminum filter basin in the hot state is about 700°C or even higher, and the operator is directly exposed to the high temperature environment, which is very prone to scalds, burns, heatstroke or dehydration, and the newly installed filter It is almost impossible to assemble the filter plate in place at one time. It is necessary to use tools to adjust the position of the filter plate many times, resulting in high labor intensity. higher spending on equipment