The Mechanism And Experimental Research On Blast Furnace Slag Gas Quenching Into Glass Beeds

Blast furnace slag is the main by-product of iron and steel smelting process.Its apparent heat energy is so huge that has high utilization value.In our country,the blast furnace slag is mostly used as water quenching slag,which not only wastes the waste heat of blast furnace slag,but also has low added value.When blast furnace slag gas quenches into beads,the glass beads formed have higher added value,and the market demand and application scope are also larger.However,there are few researches on this aspect at present,so it has certain practical significance for blast furnace slag gas quenching into beads.For above problems,analyse the feasibility of blast furnace slag gas quenching bead by theoretical analysis,whose research object is furnace slag;Study the mechanism of gas quenching bead formation from blast furnace slag by establishing mathematical model;Discuss the heat transfer process of molten blast furnace slag particles under air jet cooling by thermodynamic simulation.Through the blast furnace slag gas quenching bead forming experiment,explore the influence of the best process conditions on the bead forming effect.Meanwhile,the multiple linear regression model was established to establish the regression equation.And the relationship between the influencing factors and the bead forming rate was determined.The results show that blast furnace slag can be used as raw material to produce glass microbeads.The bead formation process of blast furnace slag is mainly divided into five stages.And nozzle diameter,gas flow rate and pressure,surface tension and viscosity of blast furnace slag will affect the bead formation process.Increasing the air flow rate can reduce the surface solidification time and the complete solidification time of blast furnace slag particles.But decreasing the diameter of slag particles can only reduce the complete solidification time and the solidification rate,but has no significant effect on the surface solidification time.The optimum process conditions are as follows: slag tapping temperature 1600?,steel slag dosage 10%,gas quenching pressure 0.3 MPa and nozzle mach number 1.6.The multiple linear regression equation with the bead formation rate shows that mach number has the greatest effect on the bead formation rate.