Technology for producing metallized furnace charge from iron-containing dust and high-silicon iron concentrate

Abstract

The invention discloses a technology for producing metallized furnace charge from iron-containing dust and high-silicon iron concentrate. The technology comprises the following steps of mixing blast furnace gas plaster, converter OG sludge, high-silicon iron concentrate and bentonite according to a weight ratio of 100: 20-30: 60-70: 2-3 to obtain a uniform mixture, wherein the blast furnace gas plaster has water content less than 8%, carrying out wet-grinding, briquetting and drying on the mixture to obtain raw pressed blocks, feeding the raw pressed blocks into a tunnel kiln, and carrying out pre-heating and reduction calcination to obtain the metallized furnace charge. The technology realizes reasonable matching of all the raw materials, realizes reasonable utilization of iron oxide, carbon and calcium oxide components in the iron-containing dust and has a product iron grade more than 55% and a metallization rate more than 85%. The technology has the advantages of simple processes, large treatment amount, full resource recovery utilization and less pollution.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a process for producing metallized charge by reduction in a tunnel kiln using iron-containing dust and high-silicon iron concentrate as raw materials. Background technique [0002] my country is a big country of iron and steel production. Since 1996, the output of iron and steel has been ranked first in the world. However, the huge production has also led to the reduction of domestic iron resources. Blast furnace gas stucco and converter OG mud are the products of flue gas wet dedusting in the steelmaking process. Both are iron-containing dust sludge with high iron content, and they are resources that can be reused. [0003] In the process of steel production, a large amount of blast furnace gas mortar and converter OG mud are produced, and the total amount has accounted for 4-7% of the steel output of the enterprise. Blast furnace gas plaster mainly cont...

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Problems solved by technology

However, there are disadvantages of high furnace temperature, thin material layer, low energy utilization efficiency and complicated equipment and process.

The rotary kiln process is relatively simple, the amount of dust to be processed is large, the resource recovery is sufficient, the environmental pollution is small, and the problem of zinc enrichment in the blast furnace gas plaster can be solved, but there is also the problem of ring formation in the rotary kiln

[0006] High-silicon refractory iron ore adopts conventional grinding and magnetic separation processes to obtain high-grade high-silicon iron fine powder, but due to the SiO in high-silicon iron fine powder 2 If the content is high, it will be directly added to the blast furnace for use, which will produce a large amount of slag and a high coke ratio, and at the same time bring certain difficulties to the smelting of the blast furnace

However, when the high-silicon iron concentrate is processed through the direct reduction process and utilized by conventional direct reduction methods such as rotary hearth furnace, the production cost is high and the resource utilization rate is low. At the same time, the direct reduction product has a high silicon content and is directly supplied to the converter. It is not economical to make steelmaking furnace charge

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