Technology of Cement Industry in Perspective
By T. Sekiwa and S. Yamamoto
Concrete Journal, Vol.37, No.12, Dec. 1999
- Synopsis
- Cement demand in Japan has been still under recession hence economic crisis in 1990. All cement producers are depressed their production and suffered severe financial problem by low operation availability and low market price, however at the field of environment, cement kilns are expected as core part of waste-recycle-system in society. Cement kilns are operated by high temperature (1400 ~1500°C) and can utilize industrial waste or by-products as secondary fuel without dioxin and all residue are composed eith clinker. Furthermore, by installing the additional process such as by-pass system of chlorine, the reusable wastes could be increased and extended to another elements containing materials. Each cement plant is also struggling with cost reduction and enegy saving by introducing new production technology, and rationalizing the plant operation by applying latest computer technology of autmatic and labor-saving system. In addition to above, new type of cement such as "high strength and high fluidity concrete" are developed by research and development in order to catch up the diverse market needs.
- Keywords:
- recession of cement demand, environment, utilization of industrial waste materials, energy saving, high strength and high fluidity concrete, automatic and labor-saving system
