Study On The Reaction Behavior Of Preparation Of Poly Ferric Sulfate From Pyrite Cinder

Pyrite cinder, a kind of red brown solid waste produced from calcining pyrite in the sulfuric acid production, contains Fe2O3, Fe3O4 metallic sulphate, metallic silicate, metallic oxide, etc.. Our country has large-volume production of sulfuric acid, so there are several millions even kilobits tons of pyrite cinder produced every year. If 80 percent of iron in the cinder can be recycled and utilized, the benefits are great. For a long time, pyrite cinder has been disposed by piling up or filling in lowlands or scrap mines, which not only squanders away natural resources, occupies plowland and increases the cost of H2SO4, but also causes the pollution to soil, water and air to some extent which does harm to our living environment.Although pyrite cinder is industrial waste, it's also a kind of potential resource. In the 1980's, our government put forward "resourcilization, quantity reduction and innocuousness" as the technique policy to control solid waste pollution. It's the best way to control solid waste pollution by utilizing and recycling the available and useful composition in the waste adequately. The main compositions in pyrite cinder are resources that can be utilized. People have made use of the cinder in many ways, but many of them are focused on low additional-value fields.Poly ferric sulfate (ab. PFS) is a type of inorganic polymer flocculants with great efficiency and can be expressed as [Fe2(OH)n(SO4)3-n/2]m- Water treatment medicaments and materials are especial products that are widely and largely used in the fields of water industry, pollution treatment, and water purification and reuse engineering. PFS attracts people's attention by its remarkable coagulant performance, especially its harmlessness and innocuousness. It's one of the promising utilization methods of pyrite cinder to use its high iron content in synthesizing PFS.Based on a detailed investigation of present utilization and recovery ofpyrite cinder, the preparation process of poly ferric sulphate was discussed in this article and good results were gained. The whole experiment process was divided into three parts - reduction roasting pyrite cinder, vitriol lixiviation and catalytic-oxidation polymerization. Advanced detection equipments and analysis technique were used to study the main reaction behaviors in the preparation process, so the advancement and rationality of the producing process were achieved, which provided technique support and theoretical foundation to the development of new methods and new processes for further utilizing pyrite cinder.To synthesize PFS with pyrite cinder is a way to change wastes to usefulness, which not only has environmental benefits, economic benefits and social benefits, but also has importantly realistic and future meaning.