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Device and method for processing slag by seawater and application of processed slag

A slag and seawater technology, applied in the field of slag treatment, can solve problems such as structural damage, steel corrosion, reinforced concrete failure, etc., to improve air quality and reduce production costs.

Active Publication Date: 2010-01-27
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the metallurgical slag is directly cooled by seawater, the concentration of chloride ions in the granular slag will increase, and building materials such as cement are the main way to use metallurgical slag. If the chloride ion content in cement rises to a certain concentration, the steel bars in the components will Corrosion occurs, which in turn leads to structural damage, resulting in failure of reinforced concrete

Method used

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  • Device and method for processing slag by seawater and application of processed slag

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Experimental program
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Embodiment 1

[0031] The invention is composed of five major systems: a molten slag granulation system, a seawater circulation system, a slag-water separation system, a steam collection system, and a captured water purification system.

[0032] Such as figure 1 As shown, the slag granulation system consists of a slag granulator 11 and a spray device 12 . The slag discharge device 13 pours the high-temperature slag 10 out of the slag container 14 (such as a slag pot or a slag tank), and discharges it to the slag granulator 11 . At this time, the seawater circulation system also continuously provides seawater to the spraying device 12. The arrangement of the spraying device 12 enables the sprayed seawater to impact on the molten slag to complete the cooling and granulation of the molten slag, while the seawater absorbs the heat in the slag. The temperature of the water therein is increased to become steam, and the seawater also has the effect of cooling the slag granulator 11 .

[0033] The...

Embodiment 2

[0043] Except that the steam collection system is composed of a steam collector 41, a condenser 44 and a discharge pipe 45, the others are the same as in Embodiment 1.

[0044] The device of the present invention has the functions of granulating slag by using seawater, steaming (desalination) and purifying the seawater, and the seawater can be recycled in the device; the desalinated and purified fresh water is used for the granulation in the device. In addition to using the slag flushing system, the excess fresh water can also be provided to users outside the system, and the backwash sewage can also be used to wash the slag. While completing the slag treatment, a large amount of waste heat in the slag is fully used to desalinate seawater, and seawater polluted by heat and impurities is not discharged to the sea, and the composition of the slag is less affected by the composition of seawater, so it can be directly Application is an intensive technology that integrates energy sa...

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Abstract

The invention provides a device and a method for processing slag by seawater and application of processed slag. The device consists of a slag granulating system, a seawater circulating system, a slag-water separating system and a steam collecting system, and the device also comprises a trapping water purifying system, wherein the steam collecting system obtains fresh water by steam generated in the process of condensation slag granulation, and utilizes the fresh water to wash the solid slag after granulation. The device can also be used for desalinating seawater, and the fresh water is obtained by condensing the steam generated in the slag granulating system. The device has the advantages of avoiding the use of external fresh water, reducing the salt content in the slag under a condition of not increasing the fresh water, and using excessive fresh water for other purposes; and simultaneously, the device does not discharge sewage or heated sewage to the sea, thereby seldom executing influences on the sea.

Description

technical field [0001] The invention relates to the field of slag treatment, in particular to a slag treatment method and device. Background technique [0002] A large amount of high-temperature slag, such as iron slag and steel slag, is produced in the production process of metallurgy and thermal power generation. The current treatment method for slag is wet method, that is, the high-temperature slag is solidified by water cooling method and processed into solid granular slag for subsequent use. This method requires a large amount of water resources to cool the slag and processing equipment. At the same time, a large amount of steam and sewage are generated during the treatment process. The direct discharge of steam makes a large amount of sensible heat in the slag wasted, especially for coastal metallurgy that uses seawater desalination. As far as enterprises are concerned, it not only causes a great waste of energy, but also greatly increases production costs. Moreover, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/06C21B3/08C04B5/00B01J2/06
CPCC21B2400/024C21B2400/032C21B2400/062C21B2400/072C21B2400/074Y02W30/50
Inventor 刘茵肖永力李永谦崔健石洪志
Owner BAOSHAN IRON & STEEL CO LTD
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