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Blast furnace slag is a by-product produced in the production process of blast furnace ironmaking. Its output is very large. The technology of using blast furnace slag to obtain mineral wool products is sufficient for its benefits, and it also reduces the environmental pollution of blast furnace slag. Waste is treasure. The process of making mineral wool products is mainly divided into four steps: melting, cotton making, cotton gathering and forming. According to the different melting process, it can be divided into cupola method and blast furnace melt to directly produce mineral wool method. The difference between the two is the difference between raw materials and melting equipment.
Blast furnace slag
The cupola method uses cold blast furnace slag as the main raw material, coke as fuel, and an appropriate amount of tempering agent (limestone, fly ash, etc.) to be smelted and tempered in the cupola. However, this method has certain shortcomings: a large amount of flue gas and dust generated in the production process, polluting the environment; the use of cold blast furnace slag feedstock requires fuel remelting, and the production of 1t mineral wool consumes about 400kg of coke, thereby increasing energy consumption and Production cost; the production of mineral wool products contains liquid balls, coarse fibers and poor hand feeling.
The direct production of mineral wool by blast furnace slag is based on blast furnace slag as the main raw material, and the liquid blast furnace slag is introduced into the heat-regulating and tempering furnace. At the same time, the tempering agent is added, and the electrode or gas is used for heat regulation and temperature regulation. The mineral fiber system is made into mineral wool fiber. After the cotton gathering and post-processing process, the mineral ore products with different properties and uses are obtained.
Compared with the cupola method, the direct production of mineral wool by blast furnace slag can recover more than 80% of the sensible heat of slag, and its energy consumption is less than 30% of the cupola method. The production cost is only 60%~80% of the cupola. Strong market competitiveness. At present, the direct production of mineral wool by blast furnace slag developed at home and abroad mainly includes JFE blast furnace slag preparation mineral wool technology, Dalian Environmental Protection Design Institute's new one-step mineral wool production technology and direct fiber forming technology proposed by Hebei United University.
For steel companies, the blast furnace slag produced by iron making is mostly used to produce cement with a low added value. If blast furnace slag, especially blast furnace slag, is used to produce mineral wool, it will provide a new road to innovation for the development of non-steel industry. At present, the price of mineral wool products ranges from 2,500 yuan per ton to 10,000 yuan. At the same time, it can also fully recover the sensible heat resources of blast furnace slag, which has great environmental benefits. Therefore, whether from the economic benefits, environmental benefits or social benefits, the use of blast furnace slag to prepare mineral wool products is a very high value-added utilization model.
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