Cement, Energy and Environment

Operational experiences in Taiheiyo Taiheiyo Cement Corporation has two ash desalination plants in Japan and has been using this system since 2001. As shown in Figure 4, the first plant at Kumagaya has been managing 60 000 tpa of incineration ash, corresponding to 30 kg of raw material per t of cement. Figure 4 indicates the transition of throughput and demonstrates the stability of this system. Table 6 shows the desalination efficiency of the process and Table 7 shows the average chemical analysis results of effluent over a period of more than 8 years. Conclusion With the desalination process and the chlorine bypass system, Taiheiyo Cement Corporation has achieved the recycling of incineration ashes containing chlorine for more than 8 years in Japan. It has become an indispensable amenity, decreasing reliance on disposal sites and preserving natural resources. Taiheiyo Cement Corporation believes that these processes will become vital infrastructure for urban cement plants in the near future. Courtesy: World Cement, February 2010, Pp47-52. 60000 -~,· f?~.· .-,:. :!% j;: f·';'•" ,..,, tXf :it·i ·~:' i ~: ~r•:...:: ~- .z-·:.: ~::/ ~_;:f' ~t;~ f:~;~. -.:-\; ~%! ~i~ ~/;; ~,. ~f 1m ~w; Jfh €' ~.f~~l~ fl f~i ~f ~ ~~;:. t8·i ·~· .>t' ~:::; ·\\·' __ -; lfT; ~,.c) ;~ I ;(~'·'/. ~,: i U'p ~~' ~ ~"·l ~ ~~i ~ ~ ~i . ~ (ill -~ zoooo 10000 0 201)1 2002 zoos zoo.. zoos l006 2001 zooe - ·fly- a &o<tom - Figure 4. Throughput for incineration residue at Kumagaya plant. Table-6 Desalination efficiency of the process Desalination rate from flyash (%) 97.9 Target desalination rate (%} >97.0 Table-7 Average analytical data of saline Discharge water Effluent standard Hazardous Cd mg/1 N.D 0.1 Pb mg/1 N.D 0.1 Total - Hg mg/1 N.D 0.005 Environmental pollutant Cu mg/1 N.D 3 Zn mg/1 N.D 5 Cr mg/1 N.D -0.1 2 pH 6.6-7.6 5-9 ss mg/1 2 - 39 600 Temperature ·c 15 - 30 45 Cl % 1.6-1.8 2 Dioxin Pg-TEQ/1 0.0003-0.016 10 • GREEN FIELD PLANTS & EXPANSION EXCESS CEMENT CAPACITY IN INDIA IN 2010 UKELY– ACC Holcim owned cement major ACC expects the cement industry to add 70 million tonnes of fresh capacity this year, putting pressure on prices. With the new additions, the cumulative installed cement production capacity of the country may cross the 300 million tonne mark. Mr. N S Sekhsaria Chairman of ACC said that "In 2010, we expect an additional capacity of about 70 million tonne to materialize, more than half of which is coming up in south-west India. Despite a growing demand for cement, these capacity additions may create surpluses in some parts of the country." He said that the prices of major inputs for cement such as coal, slag, gypsum, fly ash and petroleum products have started rising and are likely to harden in 2010, pushing up manufacturing and distribution costs. He added that 7