Integrated Analysis Based On Substance Flow Analysis Of Iron And Steel Industry In China

The steel production of our country has ranked first in the word since 1997,and the production has reached 832 million tons in 2014,which accounts for 1/2 of the word steel production.In order to figure out the growth of the size of steel industry and the relationship between energy-saving emission reduction and economic output,this paper primarily used material flow analysis to analyze the iron flow in the steel life cycle.In addition,we combined the value chain analysis and entropy analysis based on material flow analysis to calculate the value changes in iron flow in every stage and the iron changes in degree of aggregation in the life cycle process,and also comprehensively analyzed the China iron and steel industry development.Firstly,in material flow analysis,"stock and flow(STAF)" model was used to calculate the iron flow in the life cycle from 1990 to 2012,then draw the material flow chart.And this paper has calculated raw material self-sufficient rate,scrap using coefficient,social iron ore reservoir's variation,steel resource efficient and scrap index with the data of material flow analysis.The self-sufficient rate of raw material in iron and steel production stage decreased with the increase of steel production,which changed from 86.8%in 1990 to only 40.9%in 2012.Besides,the use of steel scrap was low,which remained about 8%.Our low-grade ore,fast iron and steel production and lack of scrap resources result in importing large quantities of raw materials,which is the important factor of hindering the sustainable development of China iron and steel industry.Secondly,this paper has finished the value chain analysis of China iron and steel industry based on material flow analysis from 1990 to 2012,and calculated the products value in every stage using the iron flow in life cycle and drew the value chain chart.The values changed with the iron flow in life cycle.The value will be higher when the degree of processing of iron became high.The price of the domestic iron ore was 1080 yuan/t,and the steel was 4570 yuan/t in 2012.As renewable resource,scrap is more expensive than iron ore,which was 3100 yuan/t in 2012.With the increasing production of China steel,scrap production will gradually increase and iron ore accumulation will reduce.Scrap will become important raw materials instead of iron ore.Finally,this paper has finished the entropy analysis of China iron and steel industry based on material flow analysis from 1990 to 2012,given the curve of the statistical entropy,and obtained the highest entropy of inputting raw material stage in the life cycle,corresponding to the five nodes were respectively 0.282,0.125,0.141 and 0.145 in 2012.After the whole life cycle,the entropy decreased,and after processing,the iron aggregation increased.In this paper,material flow analysis,value chain analysis and the entropy analysis were used to analyze China steel industry.We can comprehensively grasp the situation on China's iron ore resources status and steel industry production,consumption,demand,import and export.According to the data,the steel productions grow too fast,resulting in the serious shortage of domestic scrap resource.We should properly adjust the production,use more renewable scrap resource,reduce social iron ore reservoir's variation and the dependence on foreign,improve the resource utilization,increase environment output and profits,and become more energy saving,high profits and healthy.