| Jamesonite concentrate is an important material for smelting of antimony,the main producing mothed is the "desulfurization sintering-blast furnace reduction" technology in the current.It has the disadvantages of long process,much back material,high energy consumption,heavy pollution and low metal recovery rate,the associated metal dispersion.Flash smelting technology has the advantages of mature technology,high degree of automation,large production capacity,low energy consumption and so on,was considered to be the standards of cleanliness smelting process generally.Therefore,exploring the flash smelting technology application in jamesonite concentrate,promoting energy saving and reducing emission has important significance.On the analysis of jamesonite concentrate smelting characteristics prototype,the thesis establishing jamesonite concentrate flash smelting thermodynamics model with Delphi advanced computer language,using object oriented programming method,developed a computer simulation system of jamesonite concentrate flash smelting process;based on this,the thesis coupling simulation of multi factor test of brittle sulfur and lead antimony flash smelting process,investigated the oxygen of a ton of ore,melting temperature,oxygen concentration,the slag type?Fe/Si O2,Fe/Ca O?,and the coke rate reduction parameters of temperature effect on jamesonite concentrate flash smelting process,revealing laws of the jamesonite concentrate smelting process,providing a theoretical support for application development of jamesonite concentrate utilization.The main research contents and conclusions are as follows:1.On the theory of similarity,cutting jamesonite concentrate flash smelting segment into oxidation part in the tower and reduction part of coke layer;on the principle of minimum Gibbs free energy,establishing Multiphase Equilibrium mathematical model of the flash smelting reaction in the oxidation tower section and equilibrium mathematical model of the coke layer reduction section,providing a method for jamesonite concentrate flash smelting process thermodynamic study.2.Carrying out the simulation study of jamesonite concentrate flash smelting reaction in the oxidational tower;studying the effects of the process parameters of oxygen per ton ore,smelting temperature,oxygen concentration,slag type?Fe/Si O2?and?Fe/Ca O?etc.to the distribution in different phase.The results showed that:?1?per ton ore oxygen has much significant effect on the oxidation of alloy and slag output rate,but little to the smoke output rate;the distribution of lead and antimony in flue gas and the change trend of oxygen per ton ore is on the contrary.When oxygen per ton ore is high,antimony straight is low yield;low oxygen per ton ore lead to low vertical yield.Therefore,considering the pressure of the subsequent reduction and the ore recovery lead and antimony,tons of oxygen should not be too high.?2?increasing the oxygen concentration is good for reducing oxidation flue gas volume and improving metal recovery;and it will be fixed in zinc slag phase,also good for further comprehensive recovery.?3?increasing the melting temperature will be appropriate to increase the loss of lead and antimony in the flue gas and reduce the yield while not conducive to fixed in zinc slag phase.Therefore,the melting temperature should be moderate.?4?increasing Fe/Si O2 in slag is beneficial to reduce the loss of lead in the flue gas while the distribution of antimony in the flue gas will be effected lightly.But the Fe/Si O2 is too high will lead to a large quantity of slag and the subsequent reduction pressure.?5?Fe/Ca O in slag has little effect on the oxidation reaction tower,but from the angle of the viscosity of slag and slag,Fe/Ca O in slag should be moderate.3.Carrying out the reduction simulation research of brittle sulfur lead and antimony flash smelting coke layer,examining the effect of coke rate and reduction temperature of lead,antimony,zinc,bismuth,copper and arsenic metal of the matching phase in the reduction section.The results show that:?1?lead,antimony and other metal in the oxidation slag oxides can be reduced to the metal quickly by coke layer.But the excess Coke will make zinc and bismuth oxide be over-reduced into the flue gas,it is not conducive to the comprehensive recovery of valuable metals.?2?when the temperature of the coke layer changes between 10001200 degrees celsius,it has little effect on the reduction of the coke layer.However,the increase of the reduction temperature will lead to the transfer of zinc and bismuth from the partial slag into the flue gas.4.the application of flash smelting technology in the smelting of jamesonite concentrate is feasible in thermodynamics.When Fe/Si O2 is 1.15,Fe/Ca O is 1.35,melting temperature is 1200 degrees celsius;oxygen per ton ore is 130 Nm3/t,oxygen concentration is 92%,coke rate is 20 to 25 kg / T alloy,reduction temperature is 1150 degrees celsius,lead straight yield is more than 70%,antimony straight yield is more than 90%. |
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