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Technology for producing metal furnace burden for high-quality electric furnace by coal-based method

A high-quality, coal-based technology, applied in furnaces, rotary drum furnaces, furnace types, etc., can solve the problem of raw pellets sticking to the bottom of the furnace or sticking to each other, the hydrophilicity and cohesiveness of rolling fuel Insufficient, limited production efficiency of metal charge and other problems, to achieve the effect of improving ball forming, improving ball forming performance and large output

Active Publication Date: 2015-07-29
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

After a large number of experiments, the applicant found that the method of "rolling the fuel (coal powder or coke powder) and flux out of the manufactured green pellets in the mixer" provided by the patent CN 99108042.4, the hydrophilicity of the fuel rolled out The properties and cohesion are often insufficient, and the green pellets after the fuel and flux are rolled out are often easily bonded to the bottom of the furnace or to each other
Therefore, the existing method of wrapping the mixture on the green pellets severely limits the production efficiency of the coal-based method for producing metal charge

Method used

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  • Technology for producing metal furnace burden for high-quality electric furnace by coal-based method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 As shown, the coal-based method of this embodiment produces a high-quality metal charge for electric furnace, including the following steps.

[0034] (1) Ingredients: 81% by weight of hematite concentrate from Brazil, 17% by weight of anthracite clean coal from Anhui, and 2% by weight of slaked lime and binder. The above-mentioned hematite concentrate in Brazil satisfies TFe≥66%, SiO 2 ≤2.5%, the content of harmful elements S and P is less than 0.01%, and the particle size -200 mesh accounts for more than 85% of the requirements. The above-mentioned anthracite clean coal in Anhui satisfies C 固 ≥82.5%, S≤0.35%, Ash≤10% requirements. Firstly, the water in the high-grade low-silicon hematite concentrate is dried to 5% by a cylinder dryer, and then mechanically activated by a high-pressure roller mill, which performs static pressure grinding on the hematite concentrate. A large number of cracks are produced on the surface of hematite concentrate particl...

Embodiment 2

[0040] The coal-based method of this embodiment produces high-quality metal charge for electric furnaces, including the following steps.

[0041] (1) Ingredients: 81% by weight of hematite concentrate from Brazil, 17% by weight of anthracite clean coal from Anhui, and 2% by weight of slaked lime and binder. The above-mentioned hematite concentrate in Brazil satisfies TFe≥66%, SiO 2 ≤2.5%, the content of other harmful elements S and P is less than 0.01%, and the particle size -200 mesh accounts for more than 85% of the requirements. The above-mentioned anthracite clean coal in Anhui satisfies C 固 ≥82.5%, S≤0.35%, Ash≤10% requirements. Firstly, the water content in the high-grade low-silicon hematite concentrate is dried to 8% by a cylinder dryer, and then mechanically activated by a high-pressure roller mill. The high-pressure roller mill performs static pressure grinding on the hematite concentrate. A large number of cracks are produced on the surface of hematite concentrat...

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Abstract

The invention discloses a technology for producing a metal furnace burden for a high-quality electric furnace by a coal-based method, and belongs to the field of direct iron ore concentrate reducing technologies. The technology comprises the following steps: (1) blending: drying hematite concentrates, then performing mechanical activation, grinding anthracite powder, and blending and mixing the hematite concentrates, the anthracite powder, slaked lime and an adhesive; (2) balling or ball pressing: balling or pressing the mixed raw materials in the step (1) to obtain pellets or blocks; (3) mixture wrapping: wrapping the produced pellets or blocks with a layer of mixture consisting of the anthracite powder, the slaked lime and polyacrylamide powder; (4) drying and reduction: drying the pellets or blocks wrapped with the mixture in the step (3), and then putting the pellets or blocks into a rotary hearth furnace. The metal furnace burden produced by the technology can directly meet the requirement on electric furnace production and is used for partially replacing waste steel for the electric furnace.

Description

technical field [0001] The invention relates to the technical field of direct reduction of iron ore concentrates, and more specifically relates to a coal-based method for producing high-quality metal charge for electric furnaces. Background technique [0002] my country's electric furnace charge is mainly molten iron and steel scrap. Hot metal has high carbon content. If all electric furnaces use hot metal for smelting, there will be long decarburization time and low efficiency. Therefore, the proportion of hot metal used is limited, generally not exceeding 50%. my country is a country that lacks scrap steel, and the quality of scrap steel is also unstable. For example, some scrap steel contains harmful elements such as Cu and Sn, which are difficult to remove in the process of electric furnace smelting, which affects the quality of steelmaking. Due to the shortage of scrap steel, the price of scrap steel in my country is also high, which has a negative impact on the reduct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/245C22B1/216
Inventor 刘自民金俊黄发元熊德怀李小静宋灿阳
Owner MAGANG (GROUP) HOLDING CO LTD
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