Method for preparing metal elementary substance

Abstract

The invention discloses a method for preparing a metal elementary substance. The method comprises the steps of performing smelting reduction treatment on a metal block and a fluxing agent in a reducing furnace to form a slag layer and meltwater; introducing a reducing agent, fuel gas and oxygen into the reducing furnace so that part of the reducing agent is burnt to generate heat and high-temperature flue gas; reducing the metal oxide in the metal block by use of the remaining reducing agent to obtain the metal elementary substance, wherein the waste heat is recycled by use of high-temperature flue gas; the high-temperature flue gas after dust removal is used for preheating the fuel gas; the preheated fuel gas is mixed with the reducing agent, and the reducing agent is blown into the reducing furnace by the preheated fuel gas; the oxygen is directly introduced into the slag layer. By adopting the method, the added output value in a preparation process of the metal elementary substance can be effectively increased, and the reduction rate and production efficiency of metal are improved.

Description

technical field [0001] The invention relates to the field of metallurgy. In particular, the invention relates to methods of producing metals. Background technique [0002] Smelting reduction is a method of directly generating molten metal by charging metal minerals, carbonaceous materials and flux into the reduction furnace, blowing in rich oxygen or pure oxygen to reduce the metal oxides in the metal minerals. Taking ironmaking as an example, the smelting reduction method has a shorter process than the traditional blast furnace method, lower cost, less pollution, no coking and sintering processes, and no coke as fuel. Smelting reduction ironmaking has become a scientific research topic. [0003] However, most of the existing smelting reduction methods have the following shortcomings and deficiencies: 1. A certain amount of FeO exists in the slag, which is difficult to reduce and is discharged with the slag, resulting in waste of iron resources; 2. The coal added from the ...

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Problems solved by technology

[0003] However, most of the existing smelting reduction methods have the following shortcomings and deficiencies: 1. A certain amount of FeO exists in the slag, which is difficult to reduce and is discharged with the slag, resulting in waste of iron resources; 2. The coal added from the top of the reduction furnace powder, which is easy to float on the surface of the slag layer, and it is difficult to reduce FeO in the slag layer; 3. The coal powder added from the top of the reduction furnace may remain close to the inner wall of the reduction furnace, resulting in serious wear of the refractory lining and frequent shutdown of the furnace Replacement, resulting in low operating rate

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