RU1770276C - Method of boron production - Google Patents

Abstract

The invention relates to regional chemistry of organic chemistry, in particular, to methods for: - boron. A mixture of powders is prepared, wt.%: YniepOA (, 2-1, magnesium 42.8-45.0, boron oxide and - or, boric acid 43.0-57.0, and it is subjected to heat treatment in the Wren and in air or in argon medium under a pressure of 0.1-2.0 Mils. The ratio of boron and boric acid oxides in the case of using their mixture is taken equal to 1: 0.05-1.0. After the end of the interaction (10-15 min) the resulting mixture is discharged from the reactor and acid leached / v. Le: o. The invention allows to increase CL; XOA of the product from L0% to and increase the productivity of the process from 1.0 kg / h; about 1, 6-1.7 kg / h. 1 wp tab.

Description

The present invention relates to inorganic chemistry, in particular, to methods for producing elemental boron, which can be used in the chemical industry and powder metallurgy

The aim of the invention is to increase the yield of the product and increase the productivity of the process.

Example. A mixture of powders of boron oxide - B20z is prepared, the content of the main substance is 98.5%, the part / c size is up to 310 microns 47 g (47 wt.%), Map1 and MPF-3 GOST-5001-78 52.2 g (52.5% , carbon black O.E g (0.5 wt.%). TI-JT-mixed mixture pg) powder is placed in the SVS-20 reactor. Poocass is carried out in an argon atmosphere at 0.1 MPa. The reaction is initiated using a heated tungsten helix, which produces a temperature sufficient for viable interaction of the starting components and in the subsequent process

the interaction is due to the heat released in the reaction.

A few minutes (10-15) after the end of the interaction of the components of the charge mixture of the combustion mode, the resulting mixture of boron and magnesium oxide is discharged from the reactor. Boron is recovered from the product by reaction with a known chemical treatment (acid treatment, washing in water, filtration). The processing time is 2.5 hours.

The yield of elemental boron is 99%. The productivity of the process is 1.6 kg / h.

Examples 2-8 are carried out analogously to example 1 and are shown in the table.

A carbon content of less than 0.2 wt.% Does not lead to a significant effect, and if it contains more than 1 wt.% In the charge in the combustion product (in the target product), boron carbide remains. Purification of the desired product from boron carbide complicates the process of producing boron.

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ABOUT

When the charge of the oxygen-containing boron compound is 43 wt.%, Magnesium borides are formed in the product, the appearance of which causes a decrease in the yield of the target product.

When the content of the oxygen-containing boron compound in the charge is more than 57.0 wt.%, As a result of its excess, a part of the unreacted boron-containing component remains in the product, resulting in a decrease in productivity and yield of the target product.

When the magnesium content in the batch is less than 42.8 wt%, due to the excess of the boron-containing component, the unreacted boron-containing component remains in the product, which reduces the yield of the target product and the productivity of the process.

When the magnesium charge contains more than 56.0 wt.%, Attenuation occurs as a result of its intense evaporation: the combustion front does not propagate throughout the sample, i.e. part of the charge remains reacted, which reduces the productivity of the process and the yield of the target product.

At a medium pressure of less than 0.1 MPa, rapid evaporation of the starting components leads to the cessation of the distribution of the process throughout the reaction volume, i.e. part of the charge remains unreacted, which reduces the productivity of the process and the yield of the target product.

At an argon or air pressure of more than 2.0 MPa, it is difficult to sufficiently decompose boride magnesium, as well as the evolution of volatile gases such as CO

SOa. As a result of this, most of the undesirable impurities remain in the process, which reduces the yield of the target product and the productivity of the process.

When the ratio of boron oxide and

boric acid beyond 1: 0.05 - 1.0 during the synthesis in the combustion front, areas with an excess of boron-containing component or a reducing agent metal can form, which leads to the formation of magnesium boride and reduces the yield of the target product and the productivity of the process.

This invention allows to increase the yield from 50% to 98-99% and

increase the productivity of the process from 1.0 kg / h to 1.6-1.7 kg / h.

Claims (2)

1. A method of producing boron, comprising heat treatment of a mixture of an oxygen-containing compound of boron, magnesium and carbon in air or in an argon atmosphere, followed by acid leaching of the product, characterized in that, in order to increase the yield of the product and increase of the productivity of the process, an oxygen-containing boron compound is taken in an amount of 43.0-57.0 wt.%, magnesium - 42.8-56.0 wt.%, carbon - 0.2-0.1 wt.% and heat treatment of the mixture is carried out in burning mode under pressure of 0.1-2.0 MPa, 2. The method according to claim 1, characterized in that boron oxide or boric acid or a mixture thereof is used as an oxygen-containing boron compound in a mass ratio of 1: (0.05-1.0), respectively.