Research On The Ratio Of Reducing Agent In Industrial Silicon Production

In the process of industrial silicon production,it is the main tas k to maximize the melting capacity of submerged arc furnace by supplying electric energy and chemical energy to the furnace.Use of carbonaceous reducing agents as the main input source for industrial silicon production requires large amounts of non-renewable energy,such as electric power,and produces high CO ₂ emissions.Charcoal is gradually replaced at the expense of forests;Petroleum coke has high fixed carbon,low ash content and moderate volatilization,but it has high graphitization degree and high sulfur content at high temperature.Coal is higher than resistance,good chemical activity and low price,but low fixed carbon content,high ash content and low permeability.According to the present situation of different reducing agents and industrial s ilicon smelting,therefore,it is very urgent to study the application of different carbon reducing agents in industrial silicon smelting.In this paper,the ratio of reducing agent of submerged arc furnace with different furnace capacity in industrial sil icon production is studied.The specific research contents include the following aspects:（1）In this study,an industrial experiment was carried out in an 8MVA submerged arc furnace using waste carbon material instead of partial reducing agents.Under the experimental conditions,carbon efficiency when using the carbonaceous reducing agent improved,power consumption decreased and the overall energy efficiency of the industrial silicon increased.The contents of Al,Ca,Cr and Ni in the product decreased obviously.This waste carbon material produced zero emissions into the atmosphere.Per ton industrial silicon carbon emissions were reduced by>19.14%,and CO₂ emissions decreased by 0.865 t during the test.（2）Through the industrial experiment,the ratio of redu cing agent of different furnace capacity was studied.The influence coefficient of the power consumption,output and carbon emission of the independent variable was calculated by using the carbon efficiency.The ratio of suitable reducing agent was obtaine d.The results were verified by three dimensional contour map.Artificial neural network model was used to predict and verify the power consumption and exergy efficiency of suitable reducing agent.（3）The production of 25.5MVA with different reductants has be en compared in this study.When the proportion of bituminous coal/coking coal increased,the result was found that the consumption of carbon materials was been decreased,the carbon efficiency has been increased to 0.474,and per ton industrial silicon CO₂ emission was been decreased to 4.797t-CO₂/t.Moreover,the consumption of electricity and raw materials,output also have been improved during smelting,（4）By comparing and analyzing the production data of different furnaces,the advantages of large-capacity furnace smelting are verified.The power consumption,raw material consumption and carbon emission in industrial silicon smelting are advantageous by comparing with the large capacity submerged arc furnace.