A high temperature slag treatment and recovery system

Abstract

The invention discloses a high-temperature molten slag processing and recovery system. The high-temperature molten slag processing and recovery system comprises a dry granulation tower (1), a jet pump (2), a cyclone separator (3), a cooling bin (4) and a waste heat boiler (5). The side wall of the dry granulation tower (1) is provided with a chute (11). High-temperature molten slag enters the dry granulation tower (1) through the chute (11). An inlet of the jet pump (2) is connected with a discharge outlet of the dry granulation tower (1). An outlet of the jet pump (2) is connected with an inlet of the cyclone separator (3). A solid outlet of the cyclone separator (3) is connected with the cooling bin (4). A gas outlet of the cyclone separator (3) is connected with the waste heat boiler (5). Slag particles separated out through the cyclone separator (3) can be cooled through air in the cooling bin (4) and enter a slag particle collecting device. Hot air separated out through the cyclone separator (3) can be subjected to heat exchange in the waste heat boiler (5) to generate usable superheated steam. The high-temperature molten slag processing and recovery system is safe, efficient, environmentally friendly, flexible in arrangement and capable of improving cyclic utilization of sensible heat of the metallurgical molten slag.

Description

technical field [0001] The invention relates to a recovery system, in particular to a system for dry processing and waste heat recovery of steel and non-ferrous metal smelting slag. Background technique [0002] A large amount of high-temperature slag (mainly 1400-1600°C high-temperature slag and steel slag) will be produced in the process of iron and steel metallurgy, and the heat taken away by each ton of slag is equivalent to about 60kg of standard coal. Due to the difficulty in recovering heat from slag, iron and steel companies usually only consider the subsequent use of slag when processing slag, and the heat is basically not recovered. [0003] Now a conservation-minded society and a low-carbon economy have higher and higher requirements for metallurgical enterprises to save energy and reduce consumption. However, the potential for energy saving and consumption reduction in advanced iron and steel enterprises is not great, and the waste heat of slag is the only second...

AI Technical Summary

Problems solved by technology

[0004] At present, the industry generally adopts the wet method to treat metallurgical slag, of which the water consumption of the wet method accounts for more than 50% of the total water consumption of the blast furnace, and the supplementary fresh water in the slag treatment process accounts for more than 70% of the water intake of the blast furnace, which consumes a lot of water resources

Moreover, in the existing method, the sensible heat energy utilization rate of blast furnace slag in China is extremely low, a large amount of water vapor and hot water will be generated during the slag treatment process, and the water temperature in winter can reach 80°C, which affects the working environment

In addition, the heat exchange form of wet slag treatment is mainly through heat exchange for heating in winter, which cannot be used in spring, summer and autumn, and a large amount of hot water and steam cannot be used, which not only wastes the sensible heat of slag, but also affects production operations

At the same time, due to the limitation of area, flow and other conditions, the slag water contains a large amount of alkaline substances, which have a corrosive effect on pumps and pipelines. The suspended solids in the water are relatively high, which is easy to cause deposition and blockage of pipelines.

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