Research On The High Temperature Pyrolysis Characteristics Of Rubber Seed Oil

Nowadays,in the pyrometallurgical process of copper,the content of Fe₃O₄ in the furnace increases due to the intensified smelting of high oxygen potential.It leads to the increasing viscosity of copper slag and the difficulty of precipitation of matte particles.In this way,the content of copper in copper slag increases and the recovery rate of copper is affected.At present,in the process of copper slag dilution,coal,coke,diesel and other fossil fuels are mainly used.As time goes on,the fossil fuels will one day run out.It is imperative to find a new energy source for sustainable development.In order to reduce greenhouse gas production,a new idea of reducing Fe₃O₄ in copper slag by using rubber seed oil to reduce and gradually replace fossil fuels is proposed.The specific research is as follows:Firstly,the elemental composition,chemical composition,functional groups and physicochemical properties of rubber seed oil were studied.Oleic acid,linoleic acid,linolenic acid and arachidic acid are the main fatty acids in rubber seed oil.Their mass fraction added up again to about 68.33%.The carbon skeleton of long chain aliphatic hydrocarbons in rubber seed oil is mainly C₁₈.There is saturated carbon skeleton,unsaturated bond,ester bond and carboxyl bond in rubber seed oil.Secondly,the pyrolysis characteristics of rubber seed oil at lower temperatures were studied using TG-FTIR.The pyrolysis of rubber seed oil under nonisothermal conditions consists of three stages.The first stage?25¹20??consists mainly of the removal of volatile components and a reduction in molecular weight.The second stage?120⁵00??mainly consists of the cracking and volatilization of some macromolecular components.The third stage?500⁹00??is the main carbon precipitation reaction.Coats-Redfern method was used to calculate the thermodynamics of rubber seed oil.When the heating rate was 10 K/min,the activation energy at 120-400°C and 400-480°C is 69.739kJ·mol^-11 and51.861kJ·mol^-1.The pyrolysis products of rubber seed oil under nonisothermal conditions mainly include hydrocarbons,ketones,aldehydes,carboxylic acids,ethers,CO₂,CH₄,and CO.With increasing temperature,the gas components will gradually reach the maximum quantities of CH₄,H₂O,CO,and CO₂.After peaking,the production of CH₄,CO,CO₂ and H2O always decreases as the temperature increases.Finally,rubber seed oil was studied using five different feeding methods.The law of tail gas generation which is the reduction of Fe₃O₄ by rubber seed oil has been studied.With the pyrolysis process proceeding,the rubber seed oil gradually cracks and the gas gradually decreases.The cracking of rubber seed oil produces CO and CO₂.Solid carbon reacts with Fe₃O₄ during pyrolysis.Fe₃O₄ promoted the cracking of rubber seed oil.According to XRD analysis,the reduction effect of Fe₃O₄ in mixed state will reach a stable level,and the content of FeO and FeO will not change.However,with the increase of temperature,the reduction effect of Fe₃O₄ increases gradually under injection conditions.The conversion rate of mixed carbon deposition was the lowest among the five feeding methods,which was 39.98%.