Magnesium metal reduction process using liquid calcium as reducing agent and device thereof

Abstract

The present belongs to the smelting field of nonferrous metal, in particular to a magnesium deoxidation art using liquid calcium as a reducing agent and a magnesium deoxidation device. The present invention is characterized in that the liquid calcium which reacts with magnesia to get magnesium steam is adopted as the reducing agent; the art process is that the solid calcium is added into a reactor and heated to make the solid calcium melt firstly, the added quantity ensures the volume of the melted liquid calcium to occupy 1 / 3 to 2 / 3 of the reactor volume; secondly, the solid calcium and the magnesia powder are mixed according to the proportion of (1 to 2) to 1 and then sent into the reactor, the material is immersed into the liquid calcium; when the temperature reaches to 1090 DEG C, the reaction starts, the magnesium steam is produced, the reaction temperature is controlled between 1150 and 1300 DEG C, and the magnesium steam enters into a crystallizer for cooling through an induced-draft fan. The art has the advantages that the reaction is performed under the atmosphere, the reducing tin is not used, the reaction is the solid-liquid reaction, the reaction speed is fast, and the contact of the reactant is full. The art provides a route of energy conservation and consumption reduction, green production and sustainable development for the magnesium-smelting art.

Description

technical field [0001] The invention belongs to the field of nonferrous metal smelting, and in particular relates to a metal magnesium reduction process and device using liquid calcium as a reducing agent. technical background [0002] my country is a major producer of primary magnesium. In recent years, the output of primary magnesium has been ranked first in the world. However, my country is far from being a powerful country in the magnesium industry. my country's magnesium smelting process mainly adopts the silicothermal reduction method, that is, the Pidgeon method. However, there are still many problems in the silicothermal method, mainly in the following aspects: (1) The reduction temperature is high, the reduction tank works just in the critical temperature range, the service life of the reduction tank is very short (40-90 days), and the cost is greatly increased; (2) The reaction is completed under vacuum conditions and cannot be continuously fed, so continuous pro...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of high energy consumption, low reaction rate, intermittent production, long production cycle, low single furnace output, high cost and serious environmental pollution in the silicon thermal magnesium smelting process, and proposes a simple , environmental protection, and can realize large-scale continuous production of magnesium reduction process

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