Efficient Utilization of Sensible Heat of Molten Blast Furnace Slag

Abstract

The invention relates to a high-efficiency utilization method of molten-state blast furnace slag sensible heat. The method comprises the following steps: in the blast furnace ironmaking production field, taking out high-temperature liquid blast furnace slag, directly adding the high-temperature liquid blast furnace slag and other auxiliary materials for preparing microcrystalline glass into a graphite crucible of a constant-temperature electric furnace, melting the auxiliary materials in the graphite crucible by using high-temperature molten blast furnace slag sensible heat, and controlling the temperature of the graphite crucible until all the materials are uniformized in the graphite crucible; and casting the liquid material subjected to complete melting and component uniformization into a thermostatically-controlled mold, and carrying out microcrystalline glass nucleation and growth in the mold, thereby finally obtaining the blast furnace slag microcrystalline glass. The method sufficiently and efficiently utilizes the molten-state blast furnace slag sensible heat, avoids the energy source waste in the existing blast furnace slag treatment technique, avoids advanced melting of the auxiliary materials in the blast furnace slag microcrystalline glass preparation technique, and saves the energy required by melting the auxiliary materials, thereby lowering the production cost and shortening the production cycle.

Description

technical field [0001] The invention relates to metallurgical energy recovery and comprehensive utilization of solid waste, in particular to a method for efficiently utilizing sensible heat of molten blast furnace slag. Background technique [0002] The blast furnace slag produced in the ironmaking process has a high level of sensible heat, which is a high-quality waste heat resource in the metallurgical industry. The temperature of blast furnace slag discharged from the blast furnace is usually above 1450°C, and the primary sensible heat contained in each ton of blast furnace slag is roughly equivalent to the calorific value of 60kg of standard coal. At present, most of the blast furnace slag in our country is produced by water quenching method, and then used as cement raw material. Although some enterprises use the waste heat of slag flushing water for heating, which can solve the heating of part of the factory area or the heating of bathrooms, but this utilization only a...

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Problems solved by technology

[0004] Invention patent [Application No.: 201010274345.8] proposes a method of using liquid blast furnace slag to directly produce glass-ceramics. Although liquid blast furnace slag is used, it does not propose the heat utilization and recovery of liquid blast furnace slag, and the added auxiliary material SiO 2 It must be in a molten state, and the batching kiln needs to be preheated to the blast furnace slag discharge temperature in advance, which also consumes a lot of energy