Single-dip pipe silicon iron bath vacuum circulated magnesium-smelting device and method

Abstract

The invention discloses single-dip pipe silicon iron bath vacuum circulated magnesium-smelting device and method. The device comprises an induction furnace (101), a vacuum reaction chamber (104), a single dip pipe (102) and an argon blowing pipe (110) with a side wall communicated with guided flows; and besides, the device also comprises a magnesium steam condenser (206), a magnesium liquid spray thrower (210), a magnesium liquid storer (202) and magnesium mining powder conveying and spraying devices (111)-(115), wherein the magnesium steam condenser (206), the magnesium liquid spray thrower (210) and the magnesium liquid storer (202) are communicated. The method comprises the following steps of: preparing silicon iron liquid with the silicon content of 30%-65% and the temperature of 1,350-1,600 DEG C, making the mixtures of the silicon iron liquid and magnesium mining powder blown into the silicon iron liquid annularly flow between a vacuum reaction device and the induction furnace at the vacuum degree of 350 Pa-10,000 Pa for reaction to generate magnesium steam, carrying out condensation and magnesium liquid spraying to the magnesium steam to generate magnesium liquid, making the magnesium liquid flow into a storing device, and then pouring magnesium ingots. The device 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 a single dipping tube ferrosilicon bath vacuum circulation. 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 ...

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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