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Carbonatation processing method of steel scoria

A treatment method and carbonation technology, applied in the field of solid waste resource utilization

Inactive Publication Date: 2008-09-24
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there have been no reports of complete carbonation of free calcium oxide in steel slag in a short period of time

Method used

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  • Carbonatation processing method of steel scoria
  • Carbonatation processing method of steel scoria
  • Carbonatation processing method of steel scoria

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Experimental program
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Embodiment Construction

[0018] The steel slag carbonation treatment method provided by the invention adopts an ebullating bed reactor. The temperature of the reactor is controlled by an automatic control system and a heating furnace, and the reactor can be freely converted between vertical and horizontal. The vertical type is adopted when the boiling reaction is in progress, and the horizontal type is adopted when the material is poured after the reaction is completed.

[0019] First, steel slag is filled in the fluidized bed reactor, and then the heating furnace is started to heat the material. When the temperature rises to the preset reaction temperature, turn on the carbon dioxide gas source and the steam generator switch to supply gas, and the gas supply volume should be such that the material in the reactor is in a boiling state. The boiling state of the steel slag material in the fluidized bed reactor makes the steel slag fully contact with carbon dioxide and water vapor and react quickly, the...

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Abstract

The present invention provides a method of carbonatation treatment for steel slag, and comprises the steps: in a boiling-bed reactor, under the temperature of 350 to 800 DEG C and the pressure atmosphere 0.1 to 3.6 and under the condition of 5 to 25 percent of the vapor, the steel slag with the particle diameter being less than or equal to 15 mm reacts with the carbon dioxide for two to twelve hours. The present invention adopts the one-step carbonization in the boiling bed to substitute the conventional reactions with a hydration step and then a carbonization step, thus greatly shortening the carbonization time of the steel slag; the industrial waste gas and the stack gas (the valid compositions are carbon dioxide, and containing certain vapor when the temperature of the gas is more than 100 degrees centigrade) are used as the gas source, which reduces the exhaustion of the greenhouse gas carbon dioxide and adequately uses the surplus heat, while completing the carbonization of the steel slag; moreover, the operation is flexible and convenient, and the carbonization degree of the steel slag can be controlled according to the requirements of different application areas of the steel slag.

Description

technical field [0001] The invention belongs to the field of resource utilization of solid waste, and in particular relates to the modification treatment of steel slag. Background technique [0002] Steel slag, especially converter slag, is one of the largest solid wastes produced in the iron and steel industry. The environmentally friendly disposal and recycling of steel slag affects the global ecological environment and the sustainable development of the iron and steel industry to a certain extent. But so far, the comprehensive utilization channels of steel slag are relatively single. The in-factory utilization is mainly as raw material for blast furnaces and converters; the off-factory is mainly used for road engineering, building materials, steel slag fertilizer and pit filling, etc., and the added value of utilization is low. In addition, there is still a large amount of steel slag that has not been processed and utilized in time. In particular, converter steel slag co...

Claims

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Application Information

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IPC IPC(8): C04B5/00
Inventor 董晓丹陈荣欢石洪志
Owner BAOSHAN IRON & STEEL CO LTD
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