Improved pidgeon-process magnesium refining process

Abstract

The invention relates to an improved pidgeon-process magnesium refining process. The process comprises the following steps: roasting dolomite, adding silicon iron and fluorite, metering and burdening, and pressing into a pellet material after mixing and grinding; and placing the pellet material into a horizontal type reducing tank for carrying out vacuum thermal reduction and rough magnesium refining. The improved pidgeon-process magnesium refining process is characterized in that the pellet material is pressed into a honeycomb briquette-shaped disc type pellet material instead of a peach-pit-shaped pellet material in a conventional process; a concave large notch and three anti-falling ad positioning semicircular slots are respectively formed in the outer edge of the disc surface of the honeycomb briquette-shaped disc type pellet material; a positioning semicircular concave port for loading and unloading is formed in the edge of a honeycomb hole in the center of the disc surface. According to the improved pidgeon-process magnesium refining process disclosed by the invention, by reasonably designing the shape of the pellet material, carrying out matched improvement and other auxiliary means onto a reducing tank and changing the placing state of the canned pellet material, filling coefficient is improved and single-tank filling amount is increased; meanwhile, heat energy distribution in the reducing tank can be improved, heating efficiency is improved, reducing effect of the pellet material is improved, single-tank yield is increased, and finally purposes of not only increasing yield, but also saving energy, lowering consumption and lowering cost are realized.

Description

technical field [0001] The invention relates to the technical field of metal smelting, in particular to an improved technology of the Pidgeon process for smelting magnesium. Background technique [0002] The Pidgeon method (magnesium smelting process) was invented by L.M.Pidgeon, a professor at the University of Toronto in Canada. It belongs to the silicon thermal reduction method in vacuum metallurgy, referred to as the silicon thermal method, and is the main method for producing metal magnesium. The method uses calcined or calcined dolomite (commonly known as calcined white, CaO+MgO) as raw material, ferrosilicon (FeSi75) as reducing agent, and an appropriate amount of fluorite (CaF 2 ), measure the ingredients, mix and grind them, and press them into peach-shaped pellets. Put the dough into a vacuum reduction tank made of heat-resistant alloy steel (the internal vacuum is 13.3-1.33Pa or higher), and heated to 1200±10°C (the boiling point of magnesium T b.p. =1107°C), ma...

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Problems solved by technology

[0004] In the traditional Pidgeon method of magnesium smelting process, the mass is pressed into a walnut shape, and it is naturally stacked after filling the tank. The filling coefficient of the reduction tank is low and the amount of material is limited, which not only affects the heat energy distribution in the tank and the heating rate of the mass. As well as the heat utilization rate of the entire reduction furnace, it will ultimately affect the reduction effect of the group material and the output of a single tank, making the production cost high

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