SU44022A1 - The method of obtaining metallic magnesium - Google Patents

Description

In the proposed method of producing metallic magnesium, the reaction of reducing magnesium oxide with a carbonaceous substance is proposed to be carried out in two stages: First stage: magnesium oxide - - sulfur metal (or alloy) -) - carbon magnesium sulfide-J-metal (or alloy) - {- oxide carbon. The second stage: magnesium sulphide- | - (-metal (or alloy) magnesium-) is a sulfurous metal. Summary reaction: magnesium oxide -f- > -carbon magnesium-f-carbon monoxide. The first stage can be carried out either in a conventional electric furnace without the use of a vacuum or in a stream of neutral gas, or in a fiery furnace, the second in a hermetically sealed electric furnace under vacuum or in a stream of extraneous gas. Each stage is carried out under its physico-chemical conditions with respect to the temperature and pressure conditions. The above scheme of magnesium production, as compared to the reduction of magnesium oxide in one furnace, increases the productivity of a structurally more complex hermetic furnace, which requires more maintenance and, moreover, in the case of applying vacuum, facilitates its production, since in the preceding scheme it is not carbon monoxide is released. If, however, a neutral gas is used, this latter will not be mixed with carbon monoxide and therefore the consumption of this gas or the cost of its return to the process will turn out to be very insignificant. As an example of the above scheme for producing metallic magnesium, the following reactions can be given: 1) MgO- | -FeS + C MgS4-Fe-f CO 2) MgS- | -Fe Mg-f-FeS 1) + 2) MgO + C Mg + CO 1) MgO + FeMnS + with MgS-f 4-FeMn + CO 2) Mgs + FeMn Mg-f FeMnS 1) -f 2) MgO-f C Mg + CO. The subject matter of the invention. 1. A method of producing metallic magnesium using operations known per se — converting magnesium oxide to magnesium sulfide via an exchange reaction with a heavy metal, such as iron, manganese or ferromanganese, and processing formed during the exchange reaction of heavy metal sulfides for the production of magnesium sulphate by their interaction with magnesium oxide in the presence of a carbon-containing substance, characterized in that the first stage of the process for the production of magnesium sulphide is carried out in ordinary flame or electric Coy furnace, and a second step of producing magnesium metal is carried out in hermetically zakryvayuscheys electric furnace under vacuum in a stream of neutral gas.