A short-process aluminum slag treatment method in front of the furnace

Abstract

The invention relates to the technical field of aluminum slag recovery and discloses a furnace-front short-process aluminum slag treatment method. The problems that according to existing aluminum slagtreatment device and method, the recovery rate of molten aluminum in aluminum ash is low, the molten aluminum is oxidized, and the energy consumption is large are solved. The furnace-front short-process aluminum slag treatment method concretely comprises the steps of directly extruding an aluminum slag scraped from a smelting furnace and an inclined surface connected with a smelting furnace opening, and enabling the extruded molten aluminum to directly backflow into the smelting furnace along the inclined surface, wherein the extrusion pressure is 12 to 18MPa; and after compaction, maintaining the pressure for 3 to 5s, wherein the inclined surface is an upper surface of a working platform, and an inclination angle of the inclined surface is 5 to 15 degrees. According to the method, the aluminum slag extrusion efficiency is improved, the contact time of the aluminum slag and air is shortened, the burning loss of the molten aluminum is reduced, the molten aluminum is prevented from being oxidized, the recovery rate of the molten aluminum in the aluminum slag is improved, the energy consumption is reduced, the occurrence of the problems such as environment pollution caused by aluminum ash transferring and other treatment are further reduced, and the aluminum slag is further green-recovered fundamentally.

Description

technical field [0001] The invention relates to the technical field of aluminum ash recovery and treatment, in particular to a short-process aluminum slag treatment method in front of a furnace. Background technique [0002] In electrolytic aluminum and aluminum alloy smelting, a large amount of aluminum slag will be produced in the process of scrap aluminum regeneration, which contains more metallic aluminum and aluminum oxide, a small amount of silicon dioxide, magnesium oxide, and molten salt. In 2016, the country included aluminum ash in the "National Hazardous Waste List", because if the aluminum ash is not recycled, the toxic and harmful substances in the aluminum slag will not only pollute the environment, but also the waste of a large amount of aluminum metal contained in it will The waste of aluminum resources is caused. Compared with the production of primary aluminum, the recycling of aluminum slag has attracted the attention of the industry. [0003] At present,...

AI Technical Summary

Problems solved by technology

[0006] However, the existing slag presses are all separated from the smelting furnace, so it is inevitable to increase the contact time between the aluminum slag and the air during the transfer of the aluminum slag, which increases the burning loss of the aluminum liquid, resulting in unnecessary waste, and the molten aluminum out of the slag solidifies and then melts again and faces the problem of burning and increasing

Images