| While metal dust explosions tend to happen more frequently and with more casualties,dust explosions have been common in recent years and have regularly resulted in catastrophic injuries and property damage.As a typical metal dust,aluminum dust or slag is prone to hydrogen precipitation,gas explosions,and even further mixed dust and gas explosions in the presence of water and acid.Research on the features of acidified aluminum slag’s hydrogen generation is still in its infancy,and it has not yet been systematically shown how acids affect those qualities.Based on this,this study uses an experimental platform that we devised and constructed to examine the effects of the quantity of aluminum slag,sulfuric acid,and sulfuric acid concentration on the features of hydrogen generation in acidified aluminum slag.Based on this,this study uses an experimental platform that we devised and constructed to examine the effects of the quantity of aluminum slag,sulfuric acid,and sulfuric acid concentration on the features of hydrogen generation in acidified aluminum slag.(1)An experimental platform was independently designed and developed to investigate the hydrogen production characteristics of acidified aluminum slag.The platform comprises a hydrogen production test system specifically designed for acidified aluminum slag and a data acquisition system.To simulate real plant environments,the platform is equipped with bolted openings.During the experiment,hydrogen concentration sensors monitor the changes in hydrogen concentration within the square container,while transparent glass windows allow for visualizing the research process.The experimental process utilizes aluminum slag waste and sulfuric acid,both of which are byproducts of industrial production.Additionally,a comprehensive risk assessment of the experimental project has been conducted to evaluate potential hazards such as poisoning and asphyxiation,burns,and injuries resulting from object strikes.(2)Utilizing the experimental platform designed for investigating the hydrogen production characteristics of acidified aluminum slag,the influence of varying aluminum slag volumes(10,20,30,40,50,60,70,and 80 g)on the hydrogen production characteristics was examined.The results demonstrate that the hydrogen concentration initially increases,then decreases,eventually approaching zero at different aluminum slag volumes.Moreover,the rate of change of hydrogen concentration follows a pattern of increase,followed by a decrease to a negative value,and finally approaches zero.As the aluminum slag volume increases,the maximum value of hydrogen concentration in the square vessel also increases,the reaction time decreases,the peak of the rate of change of hydrogen concentration intensifies,and the time to reach the peak shortens.The study further derived the Bi Hill function model to describe the relationship between aluminum dross volume and hydrogen concentration variation within each group.Additionally,the Rational 2D prediction model was obtained to explore the variations in hydrogen concentration with different aluminum dross volumes.Interestingly,as the aluminum dross volume increases,the quantity of aluminum sulphate present on the surface of the residual aluminum dross within the vessel initially increases and then decreases.Furthermore,the hydrogen generation rate rises,the number of hydrogen concentration alarm values reached increases,and the time taken to reach the same hydrogen concentration alarm value decreases.A model for hydrogen production from acidified aluminum slag was developed and the mechanism of the effect of different aluminum slag volumes on hydrogen production was analyzed.(3)The influence of varying sulfuric acid volumes(12.5,25,50,100,150,and 200 ml)on the hydrogen production characteristics of acidified aluminum slag was investigated using an experimental platform specifically designed for studying these characteristics.The results indicate that the trends observed in hydrogen concentration and the rate of hydrogen concentration change are generally consistent with the conditions corresponding to different aluminum slag volumes.As the sulfuric acid volume increases,the maximum value of hydrogen concentration in the square vessel also increases.Additionally,the reaction time prolongs,the time required to reach the peak of hydrogen concentration change rate decreases,and the fluctuation in hydrogen concentration change rate becomes more pronounced.The relationship between sulfuric acid volume and hydrogen concentration change for each group was established through fitting using Origin software.Moreover,the Bi Hill function model was derived for each group to describe the variation in hydrogen concentration with respect to sulfuric acid quantity,and a Polynomial 2D prediction model was obtained to explore the variations in hydrogen concentration with different sulfuric acid quantities.Interestingly,as the sulfuric acid quantity increased,the presence of aluminum sulphate on the surface of the residual aluminum slag within the vessel increased.Consequently,the hydrogen generation rate decreased,and the time taken to reach different alarm values during the rising and falling stages of hydrogen concentration varied.A model of hydrogen production from acidified aluminum slag was established,and the mechanism of the effect of different sulfuric acid amounts on hydrogen production was analyzed.(4)The influence of varying sulfuric acid concentrations(1,1.5,2,2.5,3,3.5,and 4 mol/L)on the hydrogen production characteristics of acidified aluminum slag was investigated using an experimental platform specifically designed for studying these characteristics.The results demonstrate that the observed trends in hydrogen concentration and the rate of hydrogen concentration change are generally consistent with the conditions corresponding to different aluminum slag volumes.As the sulfuric acid concentration increases,the maximum value of hydrogen concentration in the square vessel also increases.Additionally,the reaction time prolongs,the peak of the rate of hydrogen concentration change increases,the time taken to reach the peak remains relatively consistent,and the fluctuations observed during the process of reaching the peak become more significant.Through Origin software fitting,the Bi Hill function model was established for each group to describe the relationship between sulfuric acid concentration and hydrogen concentration.Furthermore,a Rational Taylor prediction model was obtained to explore the variations in hydrogen concentration with different sulfuric acid concentrations.Remarkably,as the sulfuric acid concentration increased,the presence of aluminum sulphate on the surface of the residual aluminum slag within the vessel also increased.Stabilization after the first reduction of hydrogen generation.Moreover,the number of hydrogen concentration alarm values reached increased,while the time taken to reach the same hydrogen concentration alarm value decreased.A model of hydrogen production from acidified aluminum slag was established,and the mechanism of the effect of different sulfuric acid concentrations on hydrogen production was analyzed. |
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