Waste-heat pressure closed-loop thermal treatment method for molten steel slag

A treatment method and technology for steel slag, applied in the field of solid waste treatment and hot stuffy treatment of molten steel slag, can solve the problem of high power consumption of steel slag grinding, and achieve the effects of small footprint, high crushing efficiency and high degree of automation

Active Publication Date: 2011-11-02
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

The air quenching method and water quenching method can only process liquid steel slag. At the same time, the steel slag treated by air quenching method and water quenching method has high power consumption for grinding.

Method used

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  • Waste-heat pressure closed-loop thermal treatment method for molten steel slag
  • Waste-heat pressure closed-loop thermal treatment method for molten steel slag
  • Waste-heat pressure closed-loop thermal treatment method for molten steel slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1 (steel slag temperature is 1600 ℃)

[0021] 1) Start the slag tank tipping device 3 to send the slag tank filled with molten steel slag into the steel slag pretreatment chamber 1, and exit after dumping the molten steel slag. At this time, the temperature of the steel slag is 1600°C, and the steel slag is in a molten liquid state;

[0022] 2) The molten liquid steel slag is cooled by pumping water, the surface of the liquid steel slag is quickly crusted, and the cooling water is vaporized and discharged through the steam exhaust and dust removal system 6;

[0023] 3) Stop spraying water and start the roller crushing device 3 to crush the hard shell on the surface of the steel slag for the first time;

[0024] 4) After the primary crushing is completed, the liquid steel slag under the hard shell is exposed again, the rolling crushing is stopped, and water is fetched for the second time to make the liquid steel slag crust again;

[0025] 5) Start the roller ...

Embodiment 2

[0029] Embodiment 2 (steel slag temperature is 1100 ℃)

[0030] 1) Start the slag tank tipping device 2 to put the slag tank filled with molten steel slag into the steel slag pretreatment chamber 1, dump the molten steel slag and then exit. At this time, the temperature of the steel slag is 1100°C, and the steel slag is in a solid-liquid mixed state;

[0031] 2) The molten liquid steel slag is cooled by pumping water, the surface of the liquid steel slag is quickly crusted, and the cooling water is vaporized and discharged through the steam exhaust and dust removal system 6;

[0032] 3) Stop spraying water and start the roller crushing device 3 to crush the hard shell on the surface of the steel slag for the first time;

[0033] 4) After the primary crushing is completed, the liquid steel slag under the hard shell is exposed again, and the water is pumped for the second time to make the liquid steel slag crust again;

[0034] 5) Start the roller crushing device 3 for secondar...

Embodiment 3

[0038] Embodiment 3 (steel slag temperature is 850 ℃)

[0039] 1) Start the slag tank tipping device 2 to send the slag tank filled with molten steel slag into the steel slag pretreatment chamber 1, and exit after dumping the molten steel slag. At this time, the temperature of the steel slag is 850°C;

[0040] 2) The molten steel slag is cooled by pumping water and crushed by roll pressing at the same time, and the cooling water is vaporized and discharged through the steam exhaust and dust removal system 6;

[0041] 3) After 10 minutes of water spraying and rolling crushing, stop the pretreatment. At this time, the temperature of the steel slag is 300°C, and the particle size is less than 250mm;

[0042] 4) Start the roller crushing device 3 again to push the crushed solid steel slag into the waste heat pressurized stuffy tank 4;

[0043] 5) Residue heat stuffy tank with autoclaving 4. The high-temperature solid steel slag is subjected to autoclavable stuffy treatment.

[0...

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Abstract

The invention discloses a waste-heat pressure closed-loop thermal treatment method for molten steel slag and is characterized in that the method comprises the following steps of: (1) molten steel slag turning: turning the molten steel slag to a pre-treatment chamber through a slag tank over-turning vehicle; (2) rolling and crushing: spraying water onto the surface of the molten steel slag through automatic water sprayers in the pre-treatment chamber to cool the slag, and rolling and crushing the cooled slag through a rolling and crushing machine; (3) slag pushing: allowing the rolling and crushing vehicle to push the block-shaped high-temperature steel slag which is cooled in the pre-treatment chamber into a slag tank through a discharge port; (4) transport: transporting the slag tank which holds the block-shaped high-temperature steel slag to a waste-heat pressure closed-loop thermal treatment tank through a transport trolley; and (5) slaking: spraying water onto the surface of the block-shaped high-temperature steel slag to generate vapor, and converting f-CaO and f-MgO under the alternating vapor pressure to allow self-slaking and powdering of the steel slag. The method eliminates the limitations of temperature and fluidity of the steel slag, achieves the continuous, mechanical and automatic process of steel slag treatment, and has the advantages of energy conservation, land conservation, high efficiency and high safety.

Description

technical field [0001] The invention relates to a treatment method for molten steel slag in the smelting industry, and belongs to the field of solid waste treatment, in particular to the field of hot stuffy treatment of molten steel slag. Background technique [0002] At present, there are many methods for steel slag treatment, and relatively mature industrial methods include hot pouring method, hot stuffing method, water quenching method and wind quenching method. The hot pouring method can treat various forms of steel slag, but the treatment cycle is long, the land occupation is large, and the environmental pollution is serious. After three generations of improvements in the pool-type hot stuffing method, from the original solid steel slag entering the pool at about 800 °C to the current liquid slag directly entering the pool, the adaptability of steel slag treatment has expanded, and the stability of the treated steel slag is good; however, the pool-type The hot stuffy t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06
CPCY02W30/50
Inventor 钱雷范永平杨景玲邹元龙孙健董春柳孟建基
Owner CENT RES INST OF BUILDING & CONSTR CO LTD MCC GRP
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