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Melting iron and steel slag heat energy recovery method and device

A heat recovery and iron and steel slag technology, applied in the direction of recycling technology, process efficiency improvement, etc., can solve the problem of no reliable method, achieve the effect of simple structure, less equipment investment, and zero emission

Inactive Publication Date: 2010-01-06
SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Domestic Baosteel, Tangshan Iron and Steel Co., Ltd. have all conducted research on molten slag recovery technology, but there is no reliable method for industrial production

Method used

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  • Melting iron and steel slag heat energy recovery method and device

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Embodiment Construction

[0018] The method and device of the present invention will be described in detail below through specific embodiments.

[0019] A method for recovering heat from molten steel slag, the method is to put blast furnace or converter molten steel slag and a small amount of cold steel slag into an insulating slag tank, mix them evenly, and form a slag pool in the slag tank; The granulation of molten iron and steel slag increases the heat exchange area and effectively recovers the heat energy of the molten slag; the process of heat energy recovery is realized by blowing in cold air, which is heated by the cold air and then directed into the waste heat boiler. The added amount of cold slag is 30-50% of the weight of molten hot steel slag.

[0020] See figure 1 , a device for recovering heat energy from molten steel slag, including molten slag tank 1, cold slag injector 2, mixed slag tank 3, secondary granulation device 4, distributor 5, hot air recovery pipe 6, trolley 7, wind cover 8...

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Abstract

The invention relates to a melting iron and steel slag heat energy recovery method and a device, which can be applied to enterprises and production technologies relating to slag discharging under high temperature in fields like iron and steel, nonferrous metal metallurgy, etc. The invention comprises the following steps: placing melting iron and steel slags from blast furnace or revolving furnace and a small quantity of cold state iron and steel slags into a heat insulation tank; mixing evenly to ensure that a slag pool is formed in the slag tank; enlarging heat exchange area by the granulation effect of the cold slag on the melting iron and steel slag to ensure that the heat energy of melting slag is effectively recovered; realizing the process of heat energy recovery by blowing in cold wind and introducing hot wind into a waste heat boiler after the cold wind is heated. The invention fully utilizes sensible heat in slag discharging, centralizes the heat slags in a storage tank by granulating cold slags to realize heat energy recovery, therefore, the invention has simple technology, low cost, and can utilize waste heat resources effectively; besides, ferrous recovery and reuse can be carried out on the slags after treated under a low temperature.

Description

technical field [0001] The invention relates to the technical field of resource utilization and waste heat recovery, and relates to a method and device for heat recovery of molten iron and steel slag, which can be applied to enterprises and production processes involving high-temperature discharge of slag in industries such as iron and steel and nonferrous metallurgy. Background technique [0002] Steel slag and iron slag are wastes produced in the process of smelting, and the annual discharge of this industry in my country reaches tens of millions of tons. The iron content in the slag is about 10-15%, and the discharge temperature is about 1500℃. The resources of slag, the latent heat of slag in the high-temperature molten state is recycled, and the slag and iron are further separated, which can not only turn waste into treasure to achieve the purpose of comprehensive utilization of resources, but also fully and effectively use the high-temperature heat energy of molten sla...

Claims

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Application Information

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IPC IPC(8): C21B3/06
CPCY02P10/20Y02W30/50
Inventor 高惠民
Owner SINOSTEEL ANSHAN RES INST OF THERMO ENERGY CO LTD
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