Steel slag waste heat recovery and pressurized slag disintegrating system and technology

Abstract

The invention discloses a steel slag waste heat recovery and pressurized slag disintegrating system and technology. The system comprises a slag ladle tilting mechanism, a roller, a waste heat boiler, a straight-line cooler, a slag disintegrating tank, a slag ladle trolley, slag disintegrating pressurization kettles and a slag removal machine. The slag ladle tilting mechanism can tilt a slag ladle containing steel slag. The surface of the roller is provided with spirally-arranged roller teeth. The lower portion of the roller is provided with a steel slag groove. The steel slag groove is provided with a sealing cover. The steel slag in the tilted slag ladle can be conveyed into the steel slag groove through the slag removal machine, and a discharge outlet of the steel slag ladle is located above the straight-line cooler. Air is adopted as a heat exchange medium, a first fan blows air into a high-temperature material layer of the straight-line cooler, indoor-temperature air penetrates through the high-temperature steel slag from bottom to top, air is heated, and first-step heat exchange is completed. Air subjected to heat exchange through the straight-line cooler enters the roller, gas penetrates through the stirred steel slag to be further heated, and secondary heat exchange is completed. High-temperature gas is sucked to the waste heat boiler through a second fan, and therefore waste heat recovery is achieved.

Description

technical field [0001] The invention relates to a slag stuffing system, in particular to a steel slag waste heat recovery and pressurized slag stuffing system and a process. Background technique [0002] At present, the converter slag is mainly used to heat the slag pit or the slag pool, and a small amount is combined with wind quenching, water quenching and drum. The treatment medium is completely dependent on water, and the calorific value of the converter slag is high. The high temperature steel slag is directly cooled by water spraying In the way of veneering or granulation, all the heat is lost in the form of steam, and the steam generated by the veneering or granulation process is mixed with a large number of tiny steel slag particles, which seriously pollutes the air. At the same time, the steam has a large water content and consumes a lot of water. [0003] The physical pulverization and chemical reaction of steel slag require H2O as the medium. The basic oxides such...

AI Technical Summary

Problems solved by technology

[0002] At present, the converter slag is mainly used to heat the slag pit or the slag pool, and a small amount is combined with wind quenching, water quenching and drum. The treatment medium is completely dependent on water, and the calorific value of the converter slag is high. The high temperature steel slag is directly cooled by water spraying In the way of veneering or granulation, all the heat is lost in the form of steam, and the steam generated during the veneering or granulation process is mixed with a large number of tiny steel slag particles, which seriously pollutes the air. At the same time, the steam has a large water content and consumes a lot of water.

[0003] The physical pulverization and chemical reaction of steel slag require H2O as the medium. The basic oxides such as CaO and MgO in the steel slag react with water to produce stable hydroxides. The high-temperature steel slag expands and pulverizes during the water spraying process to achieve the separation of slag and iron. The water vapor generated by direct water spraying contains a large amount of steel slag particles, the quality of the steam is low, and the heat is difficult to recover and utilize

If the gas is used as the cooling medium to cool down the steel slag, heat recovery can be realized, but the gas cannot realize the decomposition and pulverization of the steel slag

Images