| Pyrite slag is a kind of solid wastes produced in sulfuric acid production line. In our country millions of tons of pyrite slag were let out every year. For long time the treatments of the pyrite slag was heaping or filling, which not only took up the farmlands, but also wasted the resources.According to the kind of constituent of pyrite slag, people can proceed many useful developments, which can not only solve the pollution of the pyrite slag and alleviative the environmental pressure, but also can make up for the shortage of resource. In the world, many countries thatproduce sulphic acid with pyrite can make use of pyrite slag with a high efficiency. But in our country, because concentration of ferric in pyrite slag is too low, and concentration of sulphur of those is too high, it can not be cast into iron. Consequently, it is necessary to low concentration of sulphur of pyrite slag.Currently, the method of removing sulphur is mainly wet mineral process. Because the dissoluble sulphur belong to useless sulphur, it is good for wet mineral process to remove sulphur.However, when the concentration of sulphur is very high, the process of magnetizing reduction is feasible. There are many researchments on increasing ferric and removing sulphur. But these efficiencies are very low, and the expense are very large. That is to say, the economic performance is not obvious. It has limited the application of pyrite slag.therefore, it is necessary for us to look for a kind of lower cost, more simple, more economical and more reasonable technology.On the basis of studing the existence of the application of pyrite slag, this thesis made use of many methods including x-ray to investigate the constituent of pyrite slag, and research on existence of sulphur.In addition, It discussed the feasibility of removing sulphur with bacterial in order to produce material of steel,and researched on factors that can have effect on removing sulphur. |
