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Waste steel hot pressing recarburizing method and device

A technology of hot briquetting and heating process, applied in the direction of reducing gas emission, etc., can solve the problems of affecting the iron recovery rate, reducing the metal iron content of the hot briquetting, and increasing the consumption per ton of steel, so as to increase the metal yield and reduce the iron and steel consumption. The effect of reducing material consumption and reducing steel consumption per ton

Pending Publication Date: 2020-11-06
山东众亿赫贸易有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] This method separates heating and hydraulic compression, which can prevent the overheating of the device from affecting the service life, but there are still the following problems: the scrap steel hot briquetting process needs to raise the temperature of the scrap steel to above 800°C (the heat preservation temperature is 900-1000°C ), some scrap steel at this temperature will be oxidized, thereby reducing the metallic iron content in the hot-briquetting block, and then affecting the iron recovery rate, resulting in only about 90% of the metallic iron in the hot-briquetting block to the total iron
However, the hot briquette made by this process will absorb a large amount of heat in the subsequent converter steelmaking production process, resulting in an increase in steel consumption per ton, affecting the output and rhythm of the converter
Practice has proved that every additional 1 ton of steel pellets prepared by the existing process will reduce the overall amount of steel scrap added by 2.5 to 3 tons

Method used

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  • Waste steel hot pressing recarburizing method and device
  • Waste steel hot pressing recarburizing method and device
  • Waste steel hot pressing recarburizing method and device

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] The invention provides a method for increasing carbon by hot-pressing scrap steel. The process includes a solid fuel crushing process, a batching process, a rotary kiln mixing and heating process, a flue gas dedusting and desulfurization process, and a hot-pressing process.

[0023] (1) Solid fuel crushing process

[0024] Use a crusher to crush the solid fuel (specifically, a four-roller crusher), requiring the maximum particle size of the solid fuel to be no more than 5mm, and the particle size of more than 90% of the solid fuel to be below 3mm. Among them, the solid fuel can be blue carbon powder, coke powder, etc., and the fixed carbon content of the solid fuel is required to be not less than 80%, and the ash content is not higher than 15%. Processed solid fuel is transported to the batching process with a belt conveyor.

[0025] (...

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Abstract

The invention discloses a waste steel hot pressing recarburizing method and device and belongs to the field of ferrous metallurgy. The waste steel hot pressing recarburizing method comprises a solid fuel crushing procedure, a material proportioning procedure, a rotary kiln mixed heating procedure, a smoke dust removal and desulfuration procedure and a hot pressing procedure. Compared with the prior art, the waste steel hot pressing recarburizing method and device can improve the carbon content in the hot pressed blocks, the metallic yield is increased by over 3%, and the consumption of steel materials is lowered.

Description

technical field [0001] The invention belongs to the technical field of steelmaking raw material preparation, and in particular relates to a method and a device for increasing the carbon content of hot-pressed scrap steel. Background technique [0002] Scrap steel is one of the raw materials for steelmaking. In order to achieve efficient utilization of scrap steel, it is required that scrap steel must have a certain lumpiness, specific gravity, high iron content and less impurities. Among the steel scrap raw materials, there are some steel particles magnetically separated from steel slag, iron particles magnetically separated from ironmaking slag, and iron filings produced during the deep processing of steel products, etc., which cannot be smelted directly in the furnace because of their small particle size. Most of the current methods are to use hot-pressing agglomeration equipment to shape the particle steel hot-briquetting block and then carry out steelmaking. For example...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C21C5/56
CPCC22B1/24C21C5/562Y02P10/143
Inventor 张展雷石国星王林华
Owner 山东众亿赫贸易有限公司
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