At present,the world pays more attention to the environmenta I problem.Also the Chinese Government will rank the issue of'strenthening environment protection’as one of 10 major tasks in the reform and the constru...At present,the world pays more attention to the environmenta I problem.Also the Chinese Government will rank the issue of'strenthening environment protection’as one of 10 major tasks in the reform and the construction in 1990s.In course of recovering the onshore petroleum re-sources,CNPC attaches importance to the environ-ment protection,therefore,oil pollution is con-trolled at lowest level at all times.In the next 6 years CNPC would make it further integrated to rectify the environment of the oil mining area,especially the waste oil and water.and the sulfurous gas,for the purpose to control the contaminant at the level in 1990,till 2000.展开更多
Clay or industrial wastes containing trace rare earth (RE) oxides as one of the components are used to burn cement clinker. When the total amount of RE oxides reaches 0. 2×10-4 - 2. 0×10-4 (wt), it has posit...Clay or industrial wastes containing trace rare earth (RE) oxides as one of the components are used to burn cement clinker. When the total amount of RE oxides reaches 0. 2×10-4 - 2. 0×10-4 (wt), it has positive effect on the burnability of raw meals? and the Alite content in clinker increases. However, with the addition of lan-thanide, the formation process of clinker and the distribu-tion of lanthanide in clinker are different from those of yt-trium. If the burning temperature is 1 450 C , yttrium shiws negative effect on the formation of clinker. There-fore, to improve the quality of cement clinkern, the raw meals in which yttrium content is lower and lanthanide con-tent is higher is preferable; to reduce the consumption of coal, the raw meals that yttrium content is higher is suit-able. Using raw meals containing trace RE oxides can re-duce the cost of fluorite and protect environment.展开更多
文摘At present,the world pays more attention to the environmenta I problem.Also the Chinese Government will rank the issue of'strenthening environment protection’as one of 10 major tasks in the reform and the construction in 1990s.In course of recovering the onshore petroleum re-sources,CNPC attaches importance to the environ-ment protection,therefore,oil pollution is con-trolled at lowest level at all times.In the next 6 years CNPC would make it further integrated to rectify the environment of the oil mining area,especially the waste oil and water.and the sulfurous gas,for the purpose to control the contaminant at the level in 1990,till 2000.
基金Sapported by the National Natural Science Foundation of China(No. 2977012)
文摘Clay or industrial wastes containing trace rare earth (RE) oxides as one of the components are used to burn cement clinker. When the total amount of RE oxides reaches 0. 2×10-4 - 2. 0×10-4 (wt), it has positive effect on the burnability of raw meals? and the Alite content in clinker increases. However, with the addition of lan-thanide, the formation process of clinker and the distribu-tion of lanthanide in clinker are different from those of yt-trium. If the burning temperature is 1 450 C , yttrium shiws negative effect on the formation of clinker. There-fore, to improve the quality of cement clinkern, the raw meals in which yttrium content is lower and lanthanide con-tent is higher is preferable; to reduce the consumption of coal, the raw meals that yttrium content is higher is suit-able. Using raw meals containing trace RE oxides can re-duce the cost of fluorite and protect environment.
