Method for controlling temperature of molten aluminum in electric-heating smelting furnace

Abstract

The invention relates to the technical field of aluminum alloy continuous-cast-rolling, in particular to a method for controlling the temperature of molten aluminum in an electric-heating smelting furnace. The method comprises the following steps: S1, temperature control before charging: a furnace gas temperature control mode is adopted for the smelting furnace, and no power is supplied to the smelting furnace for heating before charging as well as after the smelting operation on the molten aluminum in the previous funace is completed and the turning-down operation is performed; S2, temperature control after cold material charging: no power is supplied to the smelting furnace for heating immediately after the charging of a cold material; S3, temperature control after electrolytic molten aluminum charging: according to an electrolytic molten aluminum charging plan, the supply of power to the smelting furnace for heating is started before a first pack of electrolytic molten aluminum is added into the smelting furnace, and the temperature of the molten aluminum in the smelting furnace is increased continuously after a second pack of electrolytic molten aluminum is added into the smelting furnace; and S4, temperature control in the smelting process: the set temperature of furnace gas is adjusted after the temperature of the molten aluminum in the smelting furnace reaches 720 DEG C, the temperature of the furnace gas of the smelting furnace is set to be within a range of 780-820 DEG C according to such factors as the charging amount and the alloy adding amount, and the temperature of the molten aluminum is kept at 730-750 DEG C.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy continuous casting and rolling, in particular to a method for controlling the temperature of molten aluminum in an electric heating smelting furnace. Background technique [0002] The melting furnace is responsible for melting the cold material, refining the melt, adjusting the composition and adjusting the temperature in the aluminum alloy continuous casting and rolling production process. It is the basic link of the aluminum alloy casting and rolling process. The melting quality determines the stability of the subsequent casting and rolling products. and the metallurgical quality of the product. [0003] Conventional smelting furnace temperature control method pays too much attention to production efficiency. From the time of adding cold material, the smelting furnace will heat up at full load (furnace gas setting temperature above 900°C), and raise the temperature of molten aluminum to t...

AI Technical Summary

Problems solved by technology

[0003]The conventional smelting furnace temperature control method pays too much attention to production efficiency, and the smelting furnace heats up at full load (furnace gas setting temperature above 900°C) from the moment the cold material is added. Raise the temperature of the molten aluminum to the temperature range required by the process (generally 730-750°C) at the fastest speed, and then lower the temperature of the furnace gas to the normal production control range. During this period, the frequency of temperature measurement should be increased to prevent the molten aluminum from overheating , ignoring the influence of excessively high furnace gas temperature on the quality of the molten aluminum on the surface of the smelting furnace, which is not conducive to the improvement of the internal quality of the cast-rolled plate, nor is it conducive to energy saving

[0004]The main problems in the conventional operation method are as follows. First, the high-temperature furnace gas is (above 900°C) heat transfer to the molten aluminum in the smelting furnace for a long time, causing the quality of the molten aluminum on the surface to over-burn, increasing the tendency of grain growth of cast-rolled products; second, frequent temperature measurement increases the workload and increases The labor intensity of the staff is reduced; the third is that the continuous heating of the high-temperature furnace gas will easily cause the heat loss of the melting furnace, which is not conducive to energy saving; the fourth is that the long-term full-load heating of the melting furnace will easily age the silicon carbide rods and reduce the service life