Method for preparing metal elementary substance

A metal elemental and metal technology, applied in the field of metallurgy, can solve problems such as difficult reduction of FeO in slag layer, wear of refractory lining, waste of iron resources, etc., and achieve the effect of improving metal reduction rate, reducing content, and improving reuse

Active Publication Date: 2014-03-26
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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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 flo

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  • Method for preparing metal elementary substance

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[0031] The method for preparing a simple substance according to an embodiment of the present invention has the following advantages:

[0032] 1. Coal powder is blown into the bottom, preheated by the liquid metal layer, and then passed through the slag layer to reduce the metal oxides in it, which can greatly reduce the content of metal oxides in the slag, improve the metal reduction rate, and reduce the waste of resources;

[0033] 2. Reduce the coal powder on the upper surface of the slag layer, reduce the loss of refractory materials, prolong the service life of refractory materials in the furnace, and improve the operating rate;

[0034] 3. The flexibility of fuel and reducing agent, the gas can include coke oven gas, natural gas, etc., and the pulverized coal can include lignite, bituminous coal, anthracite and other coal types;

[0035] 4. The high-temperature flue gas is used to preheat the gas after dedusting. The gas temperature increases, the liquid metal layer and t...

Embodiment 1

[0043] Preparation of metallic iron: During the preparation process, the reduction furnace contains molten iron and slag, which are divided into two layers in the furnace, the upper layer is the slag layer, and the lower layer is the molten iron. Continuously or intermittently add refractory iron ore into the furnace. Oxygen-enriched is sprayed into the furnace from a lance in the center of the furnace top, and the lance head is immersed in the slag layer of the molten pool. Iron minerals are melted into a liquid state under the action of high temperature, and iron oxide and coal powder sprayed into the bottom of the furnace undergo a reduction reaction to form molten iron. Under the action of the oxygen-enriched high-speed airflow from the spray gun, the molten pool is in a state of violent agitation. The high-temperature flue gas is heat-exchanged by the waste heat boiler to generate steam for power generation, dust is removed, the gas is preheated by the heat exchanger, an...

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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 ...

Claims

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Application Information

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IPC IPC(8): C21B11/00C22B5/10
CPCY02P10/143Y02P10/20
Inventor 吴道洪李志远
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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