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Treatment method of steel smoke dust

A treatment method and steel technology, applied to the improvement of process efficiency, furnace type, furnace, etc., to achieve the effect of easy industrial operation, simple steps, and improved economic benefits

Pending Publication Date: 2021-07-16
GREENNOVO ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] For example, CN106115768A discloses a comprehensive recycling method for producing zinc oxide products from zinc-containing soot from iron and steel plants and reclaiming iron carbon for smelting. The sulfided zinc material increases the zinc concentration of the solution, purifies and removes impurities, evaporates ammonia to crystallize, and drys and calcines to obtain zinc oxide products; the soot and ash tailings are directly or screened, or enter the blast furnace for smelting, or use traditional pyrotechnics to recycle iron carbon , the collected secondary zinc oxide soot is used for front-end leaching to increase the zinc concentration of the leach solution, but this method uses ammonia leaching, which will generate additional waste water

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  • Treatment method of steel smoke dust

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Embodiment 1

[0055] The present embodiment provides a method for processing iron and steel dust, and the processing method includes the following steps:

[0056] (1) Iron and steel dust with a chlorine content of 2.4%, a zinc content of 3.5%, a carbon content of 23.8%, and an iron content of 27.5% is processed in a rotary kiln to recover secondary zinc oxide. The temperature in the kiln is 1150°C and the pressure is 0~ -50Pa, the discharge temperature is 900°C, and the rotary kiln speed is adjusted to obtain kiln slag with a particle size range of 1-9mm;

[0057] (2) The kiln slag in step (1) is processed in a rotary hearth furnace with a processing temperature of 1250° C. and a processing time of 40 minutes to recover iron products, which are returned to the steel production system.

Embodiment 2

[0059] The present embodiment provides a method for processing iron and steel dust, and the processing method includes the following steps:

[0060] (1) Iron and steel dust with a chlorine content of 4%, a zinc content of 12%, a carbon content of 18.4%, and an iron content of 19.6% is processed in a rotary kiln to recover secondary zinc oxide. The temperature in the kiln is 1250°C and the pressure is -10 ~-50Pa, the discharge temperature is 1000°C, and the rotary kiln speed is adjusted to obtain kiln slag with a particle size of 3-8mm;

[0061] (2) The kiln slag in step (1) is processed in a rotary hearth furnace with a processing temperature of 1300°C and a processing time of 35 minutes to recover iron products, which are returned to the iron and steel production system.

Embodiment 3

[0063] The present embodiment provides a method for processing iron and steel dust, and the processing method includes the following steps:

[0064] (1) Iron and steel dust with a chlorine content of 1.5%, a zinc content of 3%, a carbon content of 29.3%, and an iron content of 61.3% is processed in a rotary kiln to recover secondary zinc oxide. The temperature in the kiln is 1200°C and the pressure is 0~ -50Pa, the discharge temperature is 950°C, and the rotary kiln speed is adjusted to obtain kiln slag with a particle size range of 1-10mm;

[0065] (2) The kiln slag in step (1) is processed in a rotary hearth furnace with a processing temperature of 1200° C. and a processing time of 50 min to recover iron products, which are returned to the iron and steel production system.

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Abstract

The invention provides a treatment method of steel smoke dust. According to the treatment method, the steel smoke dust is sequentially subjected to reduction treatment through a rotary kiln and a rotary hearth furnace, zinc elements in the steel smoke dust can be recycled, the metallization degree of iron elements in final kiln slag can be improved, the steel smoke dust can be directly returned to a steel production system, moreover, nodulation blockage and refractory material corrosion of the rotary hearth furnace due to zinc and chlorine are effectively avoided, and the economic benefit is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for processing iron and steel dust. Background technique [0002] Due to various reasons, iron and steel production enterprises have increased the content of impurities in the dust and sludge produced during the production process, among which the representative impurities are elemental zinc and chlorine. When the content of zinc and chlorine in the blast furnace feed material reaches a certain level, it will cause nodules and blockage of the blast furnace flue gas system and corrosion of refractory materials. Therefore, the zinc and chlorine in the material must be controlled within a certain range. [0003] At present, the dry processing methods of conventional iron and steel dust are rotary kiln reduction volatilization method, rotary hearth furnace reduction volatilization method, etc. The variety and impurity content of materials treated by the ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B19/20C22B19/30C21B13/08
CPCC22B7/02C22B7/001C22B19/20C22B19/30C21B13/08C21B2200/00Y02P10/20
Inventor 马黎阳张武冯国军李永华唐敬坤李敦华燕建成欧阳广
Owner GREENNOVO ENVIRONMENTAL TECH CO LTD
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