FR2501238A1 - PROCESS FOR THE PREPARATION OF A FUSION METAL CONSISTING OF MANGANESE AND IRON - Google Patents

Abstract

THE INVENTION CONCERNS METALLURGY. ITS OBJECT A PROCESS FOR PREPARING A FUSION METAL CONSISTING MAINLY OF MANGANESE AND IRON. THE PROCESS CONSISTS OF INJECTING A PULVERULENT MATERIAL CONTAINING MANGANESE OXIDE DIRECTLY INTO A REDUCING FUSION ZONE AT THE SAME TIME WITH COAL AND OR HYDROCARBONS IN PULVERULENT FORM. THE REDUCING FUSION ZONE IS CONTINUOUSLY MAINTAINED BY THE SUPPLY OF THERMAL ENERGY IN A TANK FILLED WITH A SOLID REDUCER. THIS PROCESS IS PREFERRED FOR PREPARING FERROMANGANESE AND FERROSILICIUM WITH MANGANESE.

Description

250123

  The present invention relates to a method for

  a molten metal consisting mainly of

  in manganese and iron, although the metal

fusion may contain silicon.

  In certain continuous processes for developing, for example, ferromanganese in a Thysland-Mohle furnace, the supply of raw material is made difficult because both the manganese source and the reducing agent must be in fragments. The furnaces used in these known processes are also difficult to render gas-tight and thus expose

  appreciable difficulties with regard to the use of

  rationalization of the energy conveyed by the flue gases and furthermore the conduct of the known processes is made difficult by the necessity of adaptations

  required to comply with the economic regulations

in force.

  According to another known process, namely the PLASMASMELTO process, which is applied to the elaboration of

  metals from their oxides, the reduction is

  cut in two stages, that is to say by reduction

  threshold in solid phase, then by final reduction

together with the merger.

  However, it has been found that this known method, when applied to a raw material containing manganese oxide, provides no appreciable energy savings as a result of the execution.

  stage of preliminary reduction, while differences

  Significant ficulty results from the tendency of manganese oxides to become pasty at suitable temperatures for preliminary reduction. In addition, many materials which contain manganese oxides have a particle size which is too fine to allow the treatment of these materials at

  during the preliminary stages of reduction known.

  The Applicant has now discovered with

  surprise that the disadvantages and difficulties

  above can be solved by applying a method

according to the invention.

  The subject of the invention is a process for

  melting metal which consists mainly of

  in manganese and iron, in which, in stages, a pulverulent material containing the manganese oxide is injected directly into a reducing melting zone, together with coal and / or hydrocarbons, in pulverulent form, this zone being maintained on a continuous basis, with

  of thermal energy, in a tank filled with

  solid carrier. The metal produced may contain silicon

  cium. In an advantageous embodiment of the invention for the preparation of molten metals containing manganese having silicon contents

  more than 5%, a powdery substance rich in di-

  silicon oxide is added to the pulverulent material

  containing the oxides of manganese.

  The continuous supply of thermal energy to the reduction zone can advantageously be realized

  using a plasma generator.

  The invention is described in more detail below.

  after with reference to the following examples.

EXAMPLE 1

  Development of ferromanganese During this experiment, we use a

  powder mixture comprising manganese ore

  nese and slag trainers, constituting a

  first, which contains about 48% of manganese

  and 7% iron. This dietary raw material is injected

  in a reaction zone formed at the bottom of a tank filled with coke mounted in front of a plasma generator supplying this zone

reaction in thermal energy.

  A reducing agent is injected into the tank, with the above raw material, which consists of about 400 kg of pulverized coal per tonne of FeMn, this quantity of reducing agent corresponding largely to

  two-thirds of the total quantity of reducing agent

  necessary. The rest of the reducer consists of the coke column in the tank. We get out of the tank a metal that

  contains 79.1% Mn and 6.0% C, which corresponds to

  at a yield of about 87%. The slag has an alkalinity of 1.3 to 1.6 and contains 12 to 14% Mn. The quantity of slag is just 500 kg

per ton of metal.

  The process also yields about 1000 m3 of gas per tonne of metal (under normal temperature and pressure conditions) and whose composition is

about 25% H2 and 75% CO.

  The thermal energy consumption is 3000 kWh per ton, the temperature of the gas at the outlet is about 12000C and the metal and the slag drawn off

  have a temperature of about 1430 ° C.

  It is evident from the above example that ferromanganese can be produced

  without difficulty by a method of the invention.

EXAMPLE 2

  Elaboration of a manganese ferrosilicon

  For the present experiment, the subject matter

  powder is a mixture of manganese ore, quartz and lime containing approximately

% Mn and 38% SiO2.

  The raw material is injected, without reduction

  preliminary assessment, directly in the reaction zone

  in the same way as in example 1, at the same time

only pulverized coal.

  The pulverized coal is the main reductant

  cipal. A slight partial reduction and carburization of the metal by the coke of

  the column of coke in the tank. During the experience

  In fact, about 550 kg of coal per tonne is consumed

  of metal, which corresponds to more than 80% of the

total head needed.

  The metal withdrawn from the tank contains 65% Mn, 18% Si and 1.5% C. The yield of manganese is therefore about 85%. The quantity of slag is 560 kg per tonne of metal and the slag contains about 18% MnO. At the same time, 1300 m3 of gas per tonne of metal (under normal conditions of temperature and pressure) is also obtained.

about 30% H2 and 70% CO.

  The energy consumption is 4500 kWh.

  The temperature of the product gas is about 1300 C.

  The metal and the slag drawn off have a temperature

about 1550 C.

-5-

Claims (4)

  1. Process for producing a molten metal   consisting mainly of manganese and iron,   in that, in stages, a powdery material is injected   slurry containing the manganese oxide directly in a reductive melting zone, together with coal and / or hydrocarbons in pulverulent form, the zone being maintained continuously, with the supply of thermal energy, in a tank filled with a reducer solid.   2. A process for producing a manganese-containing molten metal according to claim 1, wherein the metal contains at least 5% silicon, characterized in that a pulverulent material rich in silicon dioxide is added to the material. powdery   containing the oxides of manganese ..   3. Process according to claim 1 or 2, characterized in that the thermal energy supplied to the   reduction zone is produced by a plasma generator.   4. Metal made by a process according to one   any of claims 1 to 3. JFo / FG The 28.1.1982