Blast furnace slag precipitating-filtering and white-eliminating system

Abstract

The invention discloses a blast furnace slag precipitating-filtering and white-eliminating system. The system comprises a granulating white-eliminating tower (2), a first filtering white-eliminating tank (6) and a second filtering white-eliminating tank (16); a blast furnace slag inlet (9) and a granulator (1) are arranged in the lower part of the granulating white-eliminating tower (2); a condensing and spraying device (4) is arranged in the granulating white-eliminating tower (2); a steam outlet (10) is formed in the upper part of the granulating white-eliminating tower (2); filtering layers(7) and filtering pipes (8) are arranged in the first filtering white-eliminating tank (6) and the second filtering white-eliminating tank (16); and the steam outlet (10) is connected with the filtering pipes (8) of the first filtering white-eliminating tank (6) and the second filtering white-eliminating tank (16) through a steam conveying pipeline (11). According to the system, a dual white-eliminating process including granulation tower spraying and filtration white-eliminating pool filter material cooling is adopted, harmful steam in the blast furnace slag granulation treatment process isthoroughly eliminated, and the purposes of real white-eliminating and environmental protection are achieved.

Description

technical field [0001] The invention relates to the field of metal smelting equipment, in particular to a blast furnace slag bottom filter and white removal system. Background technique [0002] High-temperature liquid slag (1350°C-1500°C) is produced during blast furnace smelting. Domestically, 700 million tons of molten iron is produced annually, and 250 million tons of high-temperature liquid slag is produced. At home and abroad, the sedimentation filtration method (often called the bottom filtration method) water slag process is usually used to granulate the molten slag. Hydraulic slag flushing is carried out in front of the blast furnace, and the slag is crushed by water quenching to become a slag-water mixture (commonly called water slag). The water slag enters the filter tank through the slag flushing ditch, and the liquid water is filtered through the filter layer in the filter tank. After recycling, the solid slag particles are left in the filter tank, and then the...

AI Technical Summary

Problems solved by technology

The method of this patent can effectively reduce part of the steam emission, and use the flue gas of the hot blast stove to heat up the steam to prevent the generation of white smoke, but in the end, some steam is still discharged into the atmosphere, that is, the real and complete elimination of white smoke cannot be achieved.

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