Analysis of flow of Cd
Figure 7 shows the current flow from the analysis. The zinc ore, being the raw material for Cd produced in Japan, is 90% imported from overseas, and it is understood that the major- ity of produced Cd is exported as NiCd batteries. The domestic demand of Cd decreased during the investigation period covered, but the volume of exports of Cd increased. A decrease in the amount of total Cd flow and an increase in exports can be observed when the flow in 2001 and the flow in 2006 are compared (Fig. 8). Products containing Cd are exported mainly to China (Fig. 9).
The amount of Cd that was finally incinerated and emitted to the atmosphere was presumed to be 0.5–1.5 ton-Cd/year, excluding disposal of household stocks. This corresponds to about 60% of the emissions from manufac- turing reported by the Pollutant Release and Transfer Reg- ister (PRTR), i.e., 0.8–2.4 ton-Cd/year.
When the Cd flow in Asia and the Pacific Rim is consid- ered, the consumption of produced zinc ore is chiefly con- centrated in Japan, South Korea, and China, as shown in Fig. 10,18 and there is an exceptional amount of production of Cd in east Asia along with ground zinc metal production, as shown in Fig. 11,19 although the production of the zinc ore is seen in many countries in Asia and the Pacific Rim. The consumption of Cd is further consolidated in China and Japan, being used for NiCd battery manufacturing, as shown in Fig. 12.19 Finally, the majority of NiCd batteries were presumed to appear in products in the North America region (such as the United States) and the Asian region (such as China).
Analysis of flow of CdFigure 7 shows the current flow from the analysis. The zinc ore, being the raw material for Cd produced in Japan, is 90% imported from overseas, and it is understood that the major- ity of produced Cd is exported as NiCd batteries. The domestic demand of Cd decreased during the investigation period covered, but the volume of exports of Cd increased. A decrease in the amount of total Cd flow and an increase in exports can be observed when the flow in 2001 and the flow in 2006 are compared (Fig. 8). Products containing Cd are exported mainly to China (Fig. 9).The amount of Cd that was finally incinerated and emitted to the atmosphere was presumed to be 0.5–1.5 ton-Cd/year, excluding disposal of household stocks. This corresponds to about 60% of the emissions from manufac- turing reported by the Pollutant Release and Transfer Reg- ister (PRTR), i.e., 0.8–2.4 ton-Cd/year.When the Cd flow in Asia and the Pacific Rim is consid- ered, the consumption of produced zinc ore is chiefly con- centrated in Japan, South Korea, and China, as shown in Fig. 10,18 and there is an exceptional amount of production of Cd in east Asia along with ground zinc metal production, as shown in Fig. 11,19 although the production of the zinc ore is seen in many countries in Asia and the Pacific Rim. The consumption of Cd is further consolidated in China and Japan, being used for NiCd battery manufacturing, as shown in Fig. 12.19 Finally, the majority of NiCd batteries were presumed to appear in products in the North America region (such as the United States) and the Asian region (such as China).
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