Double-dip pipe ferrosilicon bath vacuum circular flow magnesium-smelting device and method thereof

Abstract

The invention discloses a double-dip pipe ferrosilicon bath vacuum circular flow magnesium-smelting device and a method thereof, wherein the device comprises an induction furnace (101), a vacuum reaction chamber (104), a rising dip pipe (102), a descending dip pipe (103), an argon injection pipe (110), a magnesium vapor condenser (206), a magnesium liquid spray thrower (210), a magnesium liquid storage (202) and magnesium mineral powder transportation and spray devices (111)-(115), wherein the pipe wall of the rising dip pipe (102) is communicated with the argon injection pipe (110) for guiding flows, the magnesium vapor condenser (206), the magnesium liquid spray thrower (210) and the magnesium liquid storage (202) are communicated. The technology is characterized in that the ferrosilicon liquid contains 30-65% of silicon and the temperature is 1350-1600 DEG C; and the mixture of the ferrosilicon liquid and the injected magnesium mineral powder performs circular flow between the vacuum reaction chamber and the induction furnace, the vacuum degree is 350Pa-10000Pa, magnesium vapor is generated by reaction, and the magnesium liquid is generated by condensation and magnesium liquid spray and is stored into the storage to pour magnesium ingots. The invention has the advantages of energy-saving, low consumption, high productivity and the like.

Description

technical field [0001] The invention relates to a device and a method for smelting magnesium, in particular to a device and a method for smelting magnesium in vacuum circulation in a double-dipped ferrosilicon bath. Background technique [0002] Magnesium and magnesium alloys have the advantages of light weight, high specific strength, good thermal conductivity, easy recycling, and little environmental pollution. Known as "the green environmental protection material of the 21st century". [0003] There are generally two processes for the industrial production of magnesium metal: one is the electrolysis method; the other is the vacuum thermal reduction method, which generally uses ferrosilicon as the reducing agent, and generally uses the horizontal tank external heating cycle reduction process, also known as Pidgeon method. [0004] The electrolytic magnesium smelting method has gradually given way to the Pidgeon method in recent years due to the production of chlorine gas...

AI Technical Summary

Problems solved by technology

[0007] 1. The reactant ferrosilicon and calcined white react chemically in the form of solid phase contact, the reaction rate is slow, and the reduction reaction cycle in a typical process is as long as 10 to 12 hours, which is inefficient;

[0008] 2. The flame is used for external heating, and the heat is gradually transferred from the outside of the reactor to the inside. The cycle is long, the heat energy loss is large, and the heat energy utilization rate is low. According to professional analysis, the heat energy utilization rate of a typical process is only about 20%;

[0009] 3. Due to the limitation of the reactor volume by the external heating method, the inner diameter of a typical horizontal tank is within 400 mm, the amount of material charged at one time is small, and the raw magnesium output of a single tank is only 20-30 kg at a time, which occupies a large area and is difficult to manage on site Large, difficult to achieve large-scale production and mechanized operations;

[0011] 5. The reduced magnesium vapor is directly condensed into solid crystalline magnesium under high vacuum, without the convenience of flow, it is difficult to collect and release

[0012] 6. Horizontal tanks generally use expensive heat-resistant steel containing nickel and chromium, which consumes quickly and costs high;

[0013] 7. The smoke pollution is serious, the working environment is bad, and the negative impact on the surrounding ecological environment is great;

This method is a liquid magnesium smelting method, and its disadvantage lies in the solid thermal charging, resulting in long induction heating and melting time, long production cycle, high energy consumption, etc.

The vacuum degree of the vacuum heating chamber and the magnesium vapor condensing chamber is quite different, resulting in frequent operation of the vacuum system, and it is difficult to control accurately, and it is prone to production failures such as bridging of charge and slag

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