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Method for treating iron-containing dusts in steel plant by using melting gasification furnace

A technology for melting gasifiers and iron and steel plants, which is applied in the field of iron-containing dust in iron and steel plants, which can solve pollution and other problems, achieve the effects of reducing costs, low investment, and improving the strength of agglomerates

Inactive Publication Date: 2010-11-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Applying this method to treat iron-containing dust in iron and steel plants can not only effectively solve the pollution problem of iron-containing dust, but also obtain qualified molten iron, making full use of valuable elements such as carbon and iron in the dust

Method used

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  • Method for treating iron-containing dusts in steel plant by using melting gasification furnace
  • Method for treating iron-containing dusts in steel plant by using melting gasification furnace
  • Method for treating iron-containing dusts in steel plant by using melting gasification furnace

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Embodiment 1

[0028] What this embodiment adopts is (see Table 1 for composition) blast furnace bag ash, blast furnace gravity ash, and add a certain amount of iron ore concentrate powder, reducing agent and binding agent, adjust carbon content at 15%~20%, binding Add 1% to 3% additives, mix well, add water, press into lumps, and after drying, spread the lumps into a high-wind-temperature melting-gasifier through a distribution system to smelt molten iron. The content of harmful elements such as potassium, sodium, lead and zinc in molten iron is very low and can be ignored, and the content of zinc in blast furnace dust has increased.

[0029] Table 1 embodiment uses raw material composition (mass fraction)

[0030]

[0031]

Embodiment 2

[0033] The raw materials used in this example are the same as those in Example 1. The mixed raw materials are mixed with coke powder so that the total carbon content is about 10%. The speed is 1.55m / min, the ignition temperature is 1110°C, and the air pressure is 2.5KPa. After the sintered ore is cooled, it is distributed into the high-temperature melting and gasifier through the distribution system to smelt molten iron. The content of potassium, sodium, lead and zinc in molten iron is very small and can be ignored, and the content of zinc in blast furnace dust has increased.

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Abstract

The invention discloses a method for treating iron-containing dusts in a steel plant by using a melting gasification furnace, which comprises the following steps of: preparing uniformly mixed raw materials, namely mixing various iron-containing dusts in the steel plant, iron ore concentrate powder, adhesive and flux in a certain proportion to form the uniformly mixed raw materials; preparing lumps, namely preparing the uniformly mixed raw materials into the lumps by a cold bond agglomeration method or a hot-state agglomeration method; and smelting in a blast furnace, namely adding the prepared lumps and a certain amount of coke into the high-wind-temperature melting gasification furnace to perform melting, and finally obtaining molten iron by melting. The method for treating the iron-containing dusts in the steel plant can effectively solve the pollution problem of the iron-containing dusts, can obtain qualified molten iron, and makes full use of valuable elements such as carbon, iron and the like in wastes.

Description

Technical field: [0001] The invention relates to a method for treating iron-containing dust in iron and steel plants, especially the dust containing zinc, lead, potassium and sodium in iron and steel plants, which can not only effectively remove harmful elements in the dust, but also recycle the dust Iron, carbon and other valuable elements, while reducing the environmental pollution of steel plants. Background technique: [0002] There are many types of iron-containing dust in iron and steel plants, mainly from blast furnaces, converters, electric furnaces and sintering processes. These dusts are generally fine in size and contain a certain amount of iron, especially blast furnace dust, which also contains relatively high carbon, which is a resource worth recycling. However, because these dusts contain more harmful elements such as zinc, lead, potassium, sodium, etc., direct waste will cause environmental pollution, which is prohibited by current environmental protection r...

Claims

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Application Information

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IPC IPC(8): C21B5/00C22B1/14
Inventor 张建良王传琳杨天钧国宏伟尹慧超李净
Owner UNIV OF SCI & TECH BEIJING
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