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Solid thermal steel slag residual heat self-solution treatment method in pressure

A treatment method and slag waste heat technology, applied in the field of steel slag treatment, can solve the problems of improving the pulverization rate and stability of hot stuffy steel slag under normal pressure, not realizing the equipment of hot stuffy equipment, and the low degree of automation of the original process. Small area, low degree of automation, good product quality

Active Publication Date: 2012-07-25
CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The original hot stuffing process belongs to normal pressure hot stuffing, with long processing cycle, large floor area and high investment
[0006] 2. The original hot stuffy device is an underground structure, and the equipment of the hot stuffy device has not been realized, so the automation degree of the original process is low, and the environmental pollution is serious
[0007] 3. The pulverization rate and stability of atmospheric hot stuffy steel slag need to be improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Loading slag, put solid hot steel slag at about 600°C into the self-dissolving tank; the largest particle of the steel slag loaded into it is ≤300mm, and close the tank door of the self-dissolving tank.

[0035] 2) water spray boosting, the steel slag is automatically sprayed and cooled to produce steam with pressure, so that the pressure in the self-decomposing tank reaches 0.5MPa;

[0036] 3) Constant pressure self-decomposition, using the PLC control system to control the steam pressure in the self-decomposition tank to keep at 0.5MPa by controlling the exhaust steam volume and water spray volume; the steel slag is self-decomposed in the self-decomposition tank ;The duration is 1.75 hours;

[0037] 4) Cool down, use the PLC control system to automatically control, turn to spray water to cool down, after 1.25 hours, the temperature drops to 65°C;

[0038] 5) After the self-lysis is completed, open the vent valve to discharge the steam, and when the pressure in the...

Embodiment 2

[0040] 1) Loading slag, put solid hot steel slag at about 300°C into the self-dissolving tank; the largest particle of the steel slag loaded into it is ≤200mm, and close the tank door of the self-dissolving tank.

[0041] 2) water spray boosting, the steel slag is automatically sprayed and cooled to produce steam with pressure, so that the internal pressure of the self-decomposing tank reaches 0.4MPa;

[0042] 3) constant pressure self-decomposition, with the PLC control system by controlling the exhaust steam volume and the water spray volume, the steam pressure in the control self-decomposition tank is constantly maintained at 0.4MPa; solution; the duration is 1.5 hours;

[0043] 4) Cool down, use PLC control system to automatically control, switch to water spray to cool down, after 1 hour, the temperature drops to 65°C;

[0044] 5) After the self-lysis is completed, open the vent valve to discharge the steam, and when the pressure in the self-lysis tank is zero, the tank d...

Embodiment 3

[0046] 1) Slag loading, put solid hot steel slag at about 800°C into the self-dissolving tank; the largest particle of the steel slag loaded into it is ≤500mm, and close the tank door of the self-dissolving tank.

[0047] 2) water spray boosting, the steel slag is automatically sprayed and cooled to produce steam with pressure, so that the pressure in the self-decomposing tank reaches 0.6MPa;

[0048] 3) constant pressure self-decomposition, with the PLC control system by controlling the exhaust steam volume and the water spray volume, the steam pressure in the control self-decomposition tank is constantly maintained at 0.6MPa; solution; the duration is 2 hours;

[0049] 4) Cool down, use the PLC control system to automatically control, switch to spraying water to cool down, after 1.5 hours, the temperature drops to 65°C;

[0050] 5) After the self-lysis is completed, open the vent valve to discharge the steam, and when the pressure in the self-lysis tank is zero, the tank do...

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Abstract

The invention relates to a remaining heat pressure self-decompression treatment method of solid thermal steel slag, which is characterized by comprising the following steps: 1) loading slag: the solid thermal steel slag is loaded in an self-decompression tank; 2) spraying water and elevating pressure: the spraying water and cooling are carried out on the slag so as to generate steams with pressure; 3) constant pressure self-decompression: self-decompression is carried out on the slag in the self-decompression tank at a constant steam pressure kept; 4) cooling: water is sprayed so as to continuously cool the steel slag; and 5) completing self-decompression: a release valve is opened to give out steam so as to finish self-decompression. The treatment method has the advantages of good product quality, high efficiency, saving lands, reducing pollution and reducing investment.

Description

technical field [0001] The invention relates to a method for treating steel slag in the iron and steel smelting industry, in particular to a method for treating solid hot steel slag with residual heat under pressure and self-decomposition. Background technique [0002] In the iron and steel industry, the utilization rate of steel slag is about 10%, and 90% of steel slag is not comprehensively utilized, which does not meet the circular economy policy of energy saving, emission reduction, reduction, reuse, and resource utilization. [0003] Steel slag is generally used as a raw material for building materials. The main reason for the low utilization rate of steel slag is that f-CaO and f-MgO in steel slag are not fully hydrated and decomposed into Ca(OH) 2 , Mg(OH) 2 , so that its volume expands when it meets water, causing cracking, uplift, and deformation of building materials, road engineering, and buildings. The existing steel slag treatment methods include hot water spr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B5/00
Inventor 钱雷杨景玲朱桂林范永平孙健孙树杉
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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