Fly Ash Modified Processing Of So <sub> 2 </ Sub>, Wastewater Containing Lead Harmful Substances

Our country is the biggest country of producing and consuming coal in the world,and the burned coal occupies 70% of our country energy construction. The emission offly ash in l990 was 8 millions tons, and by the end of 2000 the amount of fly ash hadreached 160 million tons. To deal with these fly ash, the builded field of storing fly ashhas holded a lot of land and consumed much water. At present fly ash is used only 30percent in our country; further, most of the used fly ash lies in the field of constructionand stuff. Therefore, it is an important problem for our country how to handle fly ashand heighten its utilization. This text intends to develop dry desulfurizer and desulfrizeby the means of changing fly ash at aim to the weakness of the wet method ofdesulfrize. Like this, on one side the new use approach is to be developed, which canheighten the utilization rate of fly ash .On the other side the new fOrm of desulfrizer isto be explored, which can look for the desulfrize ways to adapt to the situation of ourcountry. We manufactured the changing qua1ity fly ash A like the structure of 4Azeolite with the method of calcinations-alkali and treated with the low thicknessSOz.The experimental resu1t proves: the adsorptive capacity and the desulfrize rate ofl00% are respectively 10.98%. l/20 of that of 4A zeolite, and do not attain toanticipative desulfrization effect. For this, we changed fly ash by the other method (thecalcinations-digest), and achieved the changing quality fly ash B.We disposed of thelow thickness SO2 with the fly ash B.The experimental result proves: the effect is quitegood, and it is 70 minutes that the rate of desulfurization keeps up 100%, andabsorption content achieves l33.00mg/g, and 70.76 percent of calcium are used .Theutilization rate of calcium drops 20% than that of usual dry desulfurization and the fallof press is 8.33Pa/cm. Additional, we briefly studied the ion-exchange character of thechanging fly ash A, and disposed of the waster water containing of lead, and the betterremoval result was gained.