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Climate Protection in the Japanese Cement Industry. Dec. 1, 2005. Yoshito Izumi, Ph.D. Japan Cement Association & Taiheiyo Cement Corporation. How dose Cement Industry emit CO 2 in the Processes?. Extraction Raw materials preparation Grinding, Drying, Homogenising Processing

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Climate Protection in the Japanese Cement Industry

Dec. 1, 2005

Yoshito Izumi, Ph.D.

Japan Cement Association&Taiheiyo Cement Corporation

how dose cement industry emit co 2 in the processes
How dose Cement Industry emit CO2 in the Processes?
  • Extraction
  • Raw materials preparation

Grinding, Drying, Homogenising

  • Processing

Preheating, Calcination (CaCO3  CaO+CO2)

Clinkering, Cooling

  • Grinding/Blending

Grinding, Additives

  • Cement (Transportation)

The main opportunities for CO2 reduction are (1)Energy related improvement and (2) Material Recycling.

CO2 Reduction Opportunities (Technologies for More Energy Efficient)
  • Increasing the energy efficiency of preheater
  • Installing a precalciner
  • Changing the production process from wet or vertical kiln to dry kiln
  • Optimizing the clinker cooler, raw materials and cement grinding
  • Switching fuels including alternative fuels
  • Electricity from waste heat recovery
  • Q: How to transfer those with incentives
Transition of production capacity and combination of kiln type in Japan

Wet kilns

Other dry kilns


Productive capacity(kt)


Fiscal year

CO2 Reduction Opportunities (Material Recycling)

- Co-processing Technology

Reduce CO2 emissions from fossil fuel in our society by utilizing AFR

Q:This is not fully recognized yet.

- Lowering the clinker factor in cement

Q: Applicability depends on an availability of cementitious sources in a geographical area as well as market acceptance.

Co-Processing Technology reduces CO2 emissions in our society

Source: CEMBUREAU, Alternative Fuels in Cement Manufacture, 1997.

CO2 from waste incineration in Japan : 24 million tons.

cement investments for climate protection since 2000
Cement Investments for Climate Protection since 2000

Cement Industry in Japan : 18 Companies

Total Investments : US$ 300 Million

- Energy related improvements 10%

- Increase of alternative fuels 85%

- Facilities for blending cement 5%

Alternative Fuels and Raw Materials

in the Japanese Cement Industry

(Unit:thousand tons)

net thermal energy intensity for cement manufacturing
Net Thermal Energy Intensity*) for Cement Manufacturing


*)Excluding thermal energy from alternative fuels

key technology issues for global climate protection in the cement industry
Key Technology Issues for Global Climate Protection in the Cement Industry

Establishment of Material Recycling- Based Society

Incentivized Technology Transfer

Modernization of Facility

Transition of Cement Production for Asia and Japan


Cement Production (X10,000t)



Fiscal Year

Source : JCA (China 44% and India 6% of Global Production in 2004 )