Supplementary Material for Integrated Report 2018
The Kobe Steel Group undertakes environmental management that takes the environment into consideration at every stage of its operations. As part of this approach, the Group continuously strives for greater energy efficiency; effective use of byproduct gases, waste heat, water and other resources; and the recycling of byproducts.
At Kobe Steel, 95 percent of the energy used is in the Iron & Steel Business. In fiscal 2017, this business unit used 11.43 million tons of iron ore; 6.08 million tons of coking coal and coke; 10PJ*1 of fuels such as coal, oil and city gas; and 610,000 MWh of purchased power. Nearly all of the byproduct gases—including coke oven gas, blast furnace gas and converter gas—derived from production processes are effectively reused as fuel for reheating steel or for use in in-house power plants. Kobe Steel also proactively undertakes power generation that utilizes waste heat. Combined with the power generated from byproduct gases, over 60 percent of the power required by production processes is generated through energy recovery.
In addition, byproducts produced during production processes, such as iron and steel slag*2, dust and sludge, are also turned to effective use as raw materials in applications such as cement and roadbeds. Together with in-company reuse, 97 percent of the byproducts are recycled in this manner.
In the future, Kobe Steel will continue to carry out environmentally friendly manufacturingpractices throughout all aspects of its operations, striving for more efficient use of resources and energy and advancing the development of new technologies to that end.
*2：Iron slag and steel slag are byproducts separated and recovered during iron and steel refining. They are also called blast furnace slag and steelmaking slag.
Using metal wire rods, hoops, fluxes, soluble glass and other raw materials, the Welding Business produces welding electrodes and welding wires. In fiscal 2017 the Fujisawa, Ibaraki, Saijo and Fukuchiyama plants used a total of 160,000 tons of raw materials, 62,000 MWh of electricity, and 0.2 PJ of city gas and other fuels to manufacture 160,000 tons of products. This generated 15,000 tons of byproducts, of which 98 percent was successfully recycled.
|Wire rods, hoops, fluxes, soluble glass, etc.||160,000 t||Welding rods, welding wires, etc.||160,000 t|
|Purchased power||62,000 MWh||Amount produced||15,000 t|
|City gas, etc.||0.2 PJ||Recycling ratio*||98%|
Using ingots and scrap as raw materials, the Aluminum & Copper Business produces a variety of aluminum and copper products. In fiscal 2017 the business unit used 490,000 tons of raw materials, 520,000 MWh of electricity, and 4.2 PJ of city gas and other fuels to create 450,000 tons of products.
During melting and casting, 32,000 tons of byproducts, such as slag, dust and wastewater sludge, were produced. However, 97 percent of these byproducts were successfully recycled.
|Aluminum ingots, copper ingots, etc.||490,000 t||Aluminum and copper products||450,000 t|
|Purchased power||520,000 MWh||Amount produced||32,000 t|
|City gas, etc.||4.2 PJ||Recycling ratio*||97%|