作者：SHINICHI TAMURA;NOBUHIKO NARITA;

作者单位：rodigy.net;rodigy.net

刊名：Journal of the Technical Association of Refractories

ISSN：0285-0028

出版年：2006-01-05

卷：26

期：2

起页：100

止页：106

分类号：TQ175

语种：英文

关键词：

内容简介

Table 9 summarizes the results of the inventory analyses under the defined system boundary conditions for the various alumina raw materials investigated in this study. These are trial calculations under limited conditions and under assumptions within the limited scope. Therefore, there are various problems from the viewpoint of the accuracy attained, but it has some positive significance as examples of the technique and the process trends. Seen in the viewpoint of total energy consumption, processes for Aluminous shale and Bauxite raw materials were less than 10000 (Mj-t~(-1)) but those of the other two materials were remarkably larger: Calcined and Sintered Alumina was 18251(Mj-t~(-1)) and Fused Alumina was 36504 (Mj-t~(-1)). The large electric power consumption due to crushing and electro-fusing and the fuel required for high temperature sintering contribute to this result. From the viewpoint of CO_2 emission. Aluminous shale and Bauxite raw materials processes produced about 500 (kg-CO_2-t~(-1)). Since the coal has a high CO_2 emission coefficient per calorific value, Aluminous shale raw material consequently shows a slightly higher value of CO_2 emission. Calcined and sintered aluminas and fused alumina show remarkably high CO_2 emissions, 1148 (kg-CO_2-t~(-1)) and 3198 (kg-CO_2-t~(-1)) respectively. Since these values were greatly influenced by the electric power consumption, the CO_2 emission becomes considerably larger in case of coal-fired power plants comparing with the case of nuclear or hydraulic power generation. High-grade raw materials having high performance such as calcined and sintered alumina and fused alumina require a large amount of energy to produce and their processing emits a lot of exhaust CO_2 gas. Under conditions of this study, the amount of CO_2 emission for electro-fused alumina was a little less than three times that of calcined and sintered aluminas. It was also about six times that for Aluminous shale and Bauxite alumina raw material.