Blast Furnace Smelting Of Lead Slag Computer Simulation

There are some problems in traditional processes of lead metallurgy: sintering-blast furnace treatment, such as high energetic consumption, much reverts, low SO2 concentration against sulphuric acid manufacturing, severe environment pollution, halfway removal of sulphur, and so on. For those exist mainly in sintering process, many new direct lead smelting ways are developed to solve problems while traditional process is improved continually. Many of them are the strong oxidation processes, in which the rich lead slag is produced when sulphur is removed as possible as much, and then the slag is reduced into wet lead in strong reducing atmosphere. In a word, reducing smelting of the high lead slag involves many aspects, which include a plenty of researches and experiments. But the calculating model of blast furnace treating of the slag has had little work to be done inside or outside of our country.In this paper, research and analysis has been done for the new process that high lead slag is produced in oxygen-top blowing smelting furnace in which oxidation removal of sulphur is done, and then the slag is reduced in blast furnace, which is introduced by Yunnan Metallurgical Group. Traditional and Ausmelt process of lead smelting are compared. Their merits are obvious. The ones of Ausmelt process are as follows: simple equipment, good leakproofness, easy operation, high removal rate of sulphur, high 862 concentration for sulphuric acid manufacturing, low energy consumption, and so on. And traditional blast furnace smelting: completed techniques, reliable procedure, preferable parameters for smelting, easy changing into automatic control, etc. On the base of those, a new process is presented in which two processes are combined.So, the emphasis is played on the process by which the high lead slag is reduced in blast furnace. Through thermo-dynamical analysis for the process, the thermo-dynamical model is put forward about blast treatment of the slag; the model is simulated with written program; when the simulated results are compared with theoretic value and empiric value, they tally well. Those demonstrated that the formed-model in this paper can basically interpret the process for the high lead slag smelting in blast furnace. With it, the phase composition when the system is nearly in equilibrium, the one when the controlling parameters are changed, and the one when the composition of the slag is changed, can all be calculated, thereby, the relationship between input and output variations could be understood. At the meantime, objective variations can be controlled better by adjusting input ones, which may provide some good references and the predictive role for blast furnace treatment of the high lead slag.