钢铁工业固废应用于水泥生产的降耗与减排

运用物质流分析法定量比较原生水泥与再生水泥生产过程中的物能代谢和环境负荷,并采用生命周期分析进行环境影响评价。结果表明：生产1 t原生水泥需要的直接物质投入是1.637 t;消耗原煤0.086 t/标准煤,消耗电力0.067 t/标准煤。利用钢铁工业固废生产功能单位再生水泥,可减少资源投入0.16 t;减少能源消耗0.036 t;环境排放SO2减排0.000 2 t;粉尘减排0.001 t;烟尘减排0.000 12 t;NOx减排0.000 34 t;CO2减排0.231 t。水泥生产潜在的各类环境影响中以废气排放引起的温室效应最大;其次依次是酸化效应和不可再生资源消耗;光化学烟雾和人体健康损害在水泥生产过程中的影响都相对较小。与原生水泥相比,再生水泥各环境负荷均呈下降趋势,两者总体环境负荷差值为6.93E-15。研究结果充分说明钢铁工业固废资源化可以明显的降低水泥生产的总体环境负荷,是促进水泥行业循环经济发展的有效手段。

Consumption reduction and emission reductionof cement production made by steel industrial solid waste

Material-energy metabolism and environment load in the production of primary cement and regeneration cement were compared quantitatively using Material Flow Analysis（MFA） and were evaluated of the environmental impact using Life Cycle Assessment（LCA）.It was shown from the results： direct material input to produce one ton of primary cement was 1.637 tons,raw coal consumption was 0.086t/standard coal,and electricity consumption was 0.067 t/standard coal.Resource input to produce one ton of regeneration cement using steel industry solid waste could be reduced by 0.16 t,energy consumption by 0.036 t,SO2 emission by 0.000 2 t,dust emission by 0.001 t,smoke emission by 0.000 12 t,NOx emission by 0.000 34 t,CO2 emission by 0.231 t.Among various environment impact in the production of cement,waste gas emission contributed the most to Global Warming Potential（GWP）,Acidification Potential（AP）,the second,Abiotic Depletion Potential（ADP）,the third.Photochemical Ozone Creation Potential（POCP） and Human Toxicity（HT） were relatively small in the production of cement.Compared to primary cement production,various environment load of regeneration cement production took downward trend.The difference of environment load between the two was 6.93E-15.It was evident that steel industry solid waste recycling reduced general environment load significantly and it was an effective way to promote the development of recycling economy in cement industry.