OREANDA-NEWS. October 07, 2014. The green development of TISCO continuously makes progress. The construction of the first domestic slag wool production line with molten B.F slag started in June 2013.

Now the production line entered its individual trial running period in Sept. after more than one years’ efforts by the construction workers. The construction of the production line opens a new approach for the resource recycling of the solid wastes for China iron and steel enterprises.
 
The project of the slag wool production line with molten B.F slag is a key project in TISCO during the implementation of the environmental strategy and promotion of the comprehensive utilization of renewable resources. BF slag is a by-product of the BF iron-making, the common practice of its comprehensive utilization in the world is: after water quenched, they are used as the raw material for cement production.

The drawback of the utilization is to not only waste lots of sensible heat of the BF slag but also cause second pollution to the environment. Along with the scientific-technical progress and the in-depth study of the comprehensive utilization of renewable resources, some overseas enterprises began trying to produce slag wool with molten BF slag instead of basalt and succeeded. Slag wool is a superior thermal insulation, heat insulation, sound-absorbing material with the properties of lightweight, durable and fire-proof. It is widely used in the fields of industrial thermal, refrigerating equipment and green buildings.

The molten BF slag has the similar chemical composition with basalt and can be used as the raw material for the production of slag wool. At the same time, the molten BF slag contains lots of sensible heat, when it is fully utilized, the process to heat the BF dry slag in the cupola furnace during the conventional slag wool production process can be eliminated, which not only saves energy but also protects the environment. The construction of the slag wool production line with molten B.F slag started in June 2013, this is the first slag wool production line with molten BF slag in China.
 
The slag wool production line in TISCO adopts the advanced dual hot slag melting furnaces technology to adjust the quality and the temperature and makes technically important breakthroughs. The molten BF slag can be directly charged into the primary slag melting furnace to adjust the temperature, and then charged into the refining furnace to adjust the acidity and chemical analysis of the molten BF slag. By adopting the dual hot BF slag melting furnaces technology, the sensible heat of the molten BF slag can be fully utilized, the melting time shortened, the energy consumption saved, the production efficiency improved. In addition, the charging system of the line is improved, the flow velocity fluctuation of the molten slag reduced, the slag flow rate ensured and the balance production realized. After put into operation, the recovery rate of the molten BF slag sensible heat can reach 80%, 80000 ton of BF slag can be recycled every year, 70000 ton of high quality slag wool boards and granulated wool can be produced.
 
Now the construction of the production line is progressing well. The installation of the main equipment was finished at the middle of Sept.. Now the installation of the supporting facilities is in progress and the individual trial running started.