FI71351C - SAETT ATT FRAMSTAELLA FLYTANDE METALL HUVUDSAKLIGEN BESTAOENDEAV MANGAN SAMT JAERN OCH EVENTUELLT KISEL - Google Patents

Description

1 71351

The invention relates to a process for the production of a flowable metal which contains mainly manganese and iron and optionally silicon.

In known methods, for example for the production of ferromanganese in Thysland-Mohle furnaces, the supply of raw material is made more difficult because both the manganese carrier and the reducing agent must be partial. Furthermore, the furnace designs used in these known methods are difficult to make gas-tight, which also poses considerable problems when it comes to the rational utilization of the energy content of the exhaust gas and further complicates hitherto known methods with the necessary adaptation to current environmental requirements.

According to another known method, the PLASMASMELT® method, which is used for the production of metals from oxide material, the reduction is carried out in two steps, i.e. by pre-reduction in the solid phase and final reduction during melting.

However, it has been found that this known method, when applied to a manganese oxide-containing material, in part does not provide any substantial energy gain due to the pre-reduction step used and in part causes significant problems due to manganese oxide bonding efforts at pre-reduction temperatures and small particle size to be handled in the pre-reduction stages that currently exist.

It has now surprisingly been found that the above-mentioned disadvantages and disadvantages can be overcome by the proposed process according to the invention, which is mainly characterized in that the powdered manganese oxide-containing substance together with carbon in powder form and / or hydrocarbons is injected directly into the melt reduction zone. by continuously introducing thermal energy is provided within a shaft filled with a solid reducing agent.

According to a preferred embodiment of the invention, in the case of the production of flowable manganese-containing metals with a silicon content of more than 5% silica-containing powdery substance, it is added to the powdered manganese oxide-containing material.

According to the invention, the continuous supply of heat to the reduction zone can advantageously be achieved by a plasma generator.

The invention is described in more detail below with reference to the following examples.

Example 1 Preparation of Ferromanganese A mixture of manganese ore and slag former was used in this experiment to give a starting material with about 48% manganese and 7% iron. This starting material was blown directly into the reaction zone formed at the bottom of the 20 coke-filled shaft located in front of the plasma generator supplying this reaction zone with thermal energy.

As a reducing agent, about 400 kg of carbon / t FeM was blown in simultaneously with the above-mentioned starting material, and this amount of reducing agent corresponds to a good 2/3 of the total reducing agent requirement. The missing reducing agent was formed by a coke column in the shaft.

A metal with 79.1% Mn and 6.0% C was obtained from the shaft, corresponding to a yield of about 87% Mn. The base of the slag from 30 to 30 was 1.3 to 1.6 and contained 12 to 14% Mn. The amount of slag increased slightly to 500 kg / t metal.

O

The preparation also yielded about 1000 MJ of gas / t metal and had a composition of about 25% H2 and 75% CO.

Energy consumption rose to 3,000 kWh per ton, the temperature of the exhaust gas was about 1200 ° C and the temperature of the discharged metal and slag was about 1430 °.

3,71351

It can be seen from the above example that ferromanganese can be prepared in a problem-free manner according to the invention.

Example 2 5 Preparation of ferrosilicon manganese

The experiment started from a starting material consisting of a mixture of manganese ore, quartz and lime containing about 35% Mn and 38% S1O2. · The starting material was blown directly into the reaction zone without pre-reduction in the same way as in Example 1 together with carbon powder.

In this case, the carbon powder formed the main reducing agent. Less partial reduction and carbonization of the metal was achieved with carbon from the coke column in the shaft.

15 In the experiment, about 550 kg of carbon / t of metal was imported, which is more than 80% of the total need.

A metal with 65% Mn, 18% Si and 1.5% C was dropped from the shaft. The manganese yield increased to about 85%.

The slag was 560 kg / t metal and contained 20 n. 18% MnO.

At the same time, a gas volume of 1300 m 2 per tonne of metal and its composition, i.e. about 30% H 2 and 70% CO, were also obtained.

Energy consumption was 4,500 kWh. The temperature of the produced gas 25 was about 1300 ° C. The temperature of the discharged metal and slag was about 1550 ° C.

Claims (3)

4,71351 A process for the production of a flowable metal, in particular ferro-manganese and ferrosilicon manganese, characterized in that the powdered manganese oxide-containing material together with carbon in powder form and / or hydrocarbons is injected directly into the smelting reduction zone, which continuously produces thermal energy indoors. Process for the preparation of flowable ferro-manganese and ferrosilicon manganese with a silicon content of more than 5% according to Claim 1, characterized in that the silica-rich powder is added to the powdered manganese-containing material. Method according to Claim 1 or 2, characterized in that the introduction of continuous thermal energy into the reduction zone is effected via a plasma generator.