Blast furnace slag treatment method and device capable of directly obtaining high-temperature dried slag

Abstract

The invention discloses a blast furnace slag treatment method and device capable of directly obtaining high-temperature dried slag and belongs to the technical field of blast furnace slag treatment in steel-metallurgy industries. The blast furnace slag treatment device comprises an upper water slag groove, a high-pressure water spray head, a special net-type conveyor belt, a lower hot water collecting groove and an end slag-blocking net; liquid blast furnace slag flows into the upper water slag groove and is cooled by water sprayed by a high-pressure water nozzle, and the liquid blast furnace slag is broken into a small-granular slag-water mixture after water quenching, cooling and breaking, and the slag-water mixture flows downwards along the upper water slag groove by aid of gravity; after the temperature of granulated blast furnace slag is lowered to be 400-800 DEG C, the granulated blast furnace slag falls into the special net-type conveyor belt to quickly achieve slag-water separation, after water falls into the lower hot water collecting groove, the water is continuously used through a circulating system, and after separation, water on the surface of slag is heated and then evaporates, so that the high-temperature dried slag of 300-700 DEG C is formed; and the high-temperature dried slag is finally sent to a waste heat boiler to be subjected to waste heat using. According to the blast furnace slag treatment method and device capable of directly obtaining the high-temperature dried slag, the waste heat using rate of blast furnace slag treatment can be greatly improved, the product quality of solid slag is improved, and energy conservation and emission reduction of the steel-metallurgy industries are facilitated.

Description

[0001] Technical field: [0002] The invention belongs to the field of blast furnace slag processing equipment in the iron and steel metallurgy industry, and in particular relates to a blast furnace slag processing method and device capable of directly obtaining high-temperature dry slag. [0003] Background technique: [0004] In iron and steel production, the utilization rate of slag is relatively low, which is far away from the goal of "zero" solid waste discharge in iron and steel enterprises, and in the process of slag treatment, the energy consumption is high. The consumption of reclaimed water is particularly large, and there will be a large amount of steam released. The steam contains hydrogen sulfide, sulfur dioxide, etc., which also pollutes the surrounding environment. At the same time, the heat of the slag cannot be effectively used. [0005] For a long time, many researchers have studied this problem, and designed slag forming methods such as drum slagging, rotary ...

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Problems solved by technology

In the traditional treatment process, the liquid slag is extracted by water and broken into particles of about 4mm. The final treated slag has a high water content and needs to be treated in a sedimentation tank before being sent to the cement plant as a raw material for cement. This process wastes a lot Each ton of slag needs about 6 tons of circulating water. The industrial wastewater formed is difficult to purify, and the steam generated is difficult to collect. After being released, it will cause white pollution to the environment and easily corrode the surrounding buildings.

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