A technical method for improving the on-line recovery rate of recycled waste miscellaneous aluminum melting ash

Abstract

The invention provides a technique for increasing on-line recovery rate of regenerated scrap aluminum melted ash residues. The technique comprises the following steps: mixing scrap broken primary aluminum and scrap broken wrought aluminum according to a certain ratio, taking the obtained mixture as a base material, covering massive ingot materials, then dissolving, adding a small quantity of scrapbroken material in batches for multiple times, turning on big fire flame when the temperature is about 590 DEG C after all the materials in a furnace hearth are dissolved, stirring ash residues on the surface of aluminum melt liquid, separating the melted ash residues and aluminum liquid, and pouring the melted ash residues and the aluminum liquid out; pulling iron parts at the bottom of the furnace to a furnace platform slope, scattering a fluxing medium, instantly turning on the flame, separating molten aluminum liquid attached on the iron parts, putting the hot ash residues in a rotary furnace, pouring the hot ash residues into heat insulation ladles when the temperature is at 640 DEG C, and transporting and holding the heat insulation ladles in a melting furnace. Through the techniquefor increasing the on-line recovery rate of regenerated scrap aluminum melted ash residues, the burning loss of the scrap aluminum can be greatly reduced; the secondary remelting of the recycled aluminum ingots can be avoided; the content of aluminum in the melted ash residues can be reduced; the melting energy consumption can be greatly reduced; the melting rate of the scrap aluminum can be increased; the problem that the iron parts outside the scrap aluminum can be avoided; and a large amount of the scrap aluminum containing the iron parts can be continuously used.

Description

technical field [0001] The invention belongs to the field of waste aluminum refining and purification, and in particular relates to a technical method for improving the online recovery rate of regenerated waste miscellaneous aluminum melting ash. Background technique [0002] The domestic industry uses recycled scrap aluminum to melt cast aluminum alloy ingots for car engines through flame reverberatory furnaces. Recycled waste miscellaneous aluminum has complex sources, different shapes, different burning losses, and contains in vitro iron parts. According to the general melting process in the flame reverberatory furnace in the domestic industry: (1) Large burning loss: the comprehensive burning loss rate is 1.5%-3.0%, especially the burning loss of bundled flake waste is 3%-10%, and the scrap material The maximum burning loss can reach 30%; (2) The molten ash and iron slag contain high aluminum content: the aluminum content is 50%-70%, increasing the secondary recovery of...

AI Technical Summary

Problems solved by technology

According to the general melting process in the flame reverberatory furnace in the domestic industry: (1) Large burning loss: the comprehensive burning loss rate is 1.5%-3.0%, especially the burning loss of bundled flake waste is 3%-10%, and the scrap material The maximum burning loss can reach 30%; (2) The molten ash and iron slag contain high aluminum content: the aluminum content is 50%-70%, increasing the secondary recovery of molten ash aluminum; (3) High energy consumption for melting: tons Melting energy consumption is 50-60M 3 (Only refers to the melting energy consumption of the melting furnace, excluding the melting and heat preservation energy consumption of the holding furnace) (calorific value: 8500kcal / m 3 , burner: regenerative combustion system); (4) The iron parts outside the scrap aluminum are easy to melt, resulting in excessive chemical composition of iron elements, or causing regional segregation of molten aluminum and iron components in the holding furnace, affecting product quality and increasing seasoning costs, Even cause the product to be scrapped, resulting in the inability to use waste miscellaneous aluminum containing external iron parts, the material procurement cost is too high; (5) the melting rate of waste miscellaneous aluminum is low, melting waste miscellaneous aluminum 5-6 tons per hour (3 million kcal heat storage type burner); (6) After the molten ash and iron slag are recovered through the rotary furnace, the recycled aluminum liquid is poured, cooled and solidified into ingot-like materials, which are re-used as raw materials and put into the melting furnace for melting, resulting in secondary remelting. Secondary remelting aluminum loss and energy consumption

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