Material Balance

The KOBELCO Group promotes environmental management taking 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.

Resource and Energy Use at Kobe Steel, Ltd. Material Business

Iron & Steel Business

At Kobe Steel, Ltd., 95 percent of the energy used is consumed by the Iron, Steel & Titane Business. In fiscal 2020, this business division used 9.31 million tons of iron ore; 4.92 million tons of coking coal and coke; 12PJ*1 of fuels such as coal, oil and city gas; and 430,000 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.

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, 96 percent of the byproducts are recycled in this manner.

In the future, Kobe Steel will continue to carry out environmentally friendly manufacturing practices 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.

  • *1:1PJ=1015J

    *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.

Resource and Energy Use in the Iron, Steel & Titane Business (Fiscal 2020)

鉄鋼、チタン事業における資源・エネルギーの利用状況(2021年度)

Welding Business

Using metal wire rods, hoops, fluxes, soluble glass and other raw materials, the Welding Business produces welding electrodes and welding wires. In fiscal 2019, the Fujisawa, Ibaraki, Saijo and Fukuchiyama plants used a total of 130,000 tons of raw materials, 53,000 MWh of electricity, and 0.2 PJ of city gas and other fuels to manufacture 130,000 tons of products. This generated 10,000 tons of byproducts, of which 97 percent was successfully recycled.

Resource and Energy Use in the Welding Business (Fiscal 2020)

INPUT OUTPUT
Raw materials Products
Wire rods, hoops, fluxes, soluble glass, etc. 130,000 t Welding rods, welding wires, etc. 130,000 t
Energy By-Products
Purchased power 53,000 MWh Amount produced 10,000 t
City gas, etc. 0.2PJ Recycling rate* 97%

*Recycling rate indicates the rate of waste that is not consigned to landfills of the total amount of waste generated.

Aluminum & Copper Business

Using ingots and scrap as raw materials, the Aluminum & Copper Business produces a variety of aluminum and copper products. In fiscal 2020, the business division used 430,000 tons of raw materials, 490,000 MWh of electricity, and 3.9 PJ of city gas and other fuels to create 410,000 tons of products.

During melting and casting, 30,000 tons of byproducts, such as slag, dust and wastewater sludge, were produced. However, 95 percent of these byproducts were successfully recycled.

Resource and Energy Use in the Aluminum & Copper Business (Fiscal 2020)

INPUT OUTPUT
Raw materials Products
Aluminum ingots, copper ingots, etc. 430,000 t Aluminum and copper products 410,000 t
Energy By-products
Purchased power 490,000MWh Amount produced 30,000 t
City gas, etc. 3.9PJ Recycling rate* 95%

※Recycling rate indicates the rate of waste that is not consigned to landfills of the total amount of waste generated.

Main Resource Use at Kobe Steel, Ltd.

Main raw materials Unit FY 2018 FY 2019 FY 2020
Iron ore 1,000 t 10,370 10,380 9,31
Coking coal / coke 1,000 t 5,650 5,360 4,919
Aluminum ingots, copper ingots, etc. 1,000 t 470 430 427
Total 1,000 t 16,490 16,170 14,653

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