Ammonium sulfate solution deep arsenic-removal method based on modified nano-iron

The invention relates to an ammonium sulfate solution deep arsenic-removal method based on nano-iron, and belongs to the technical field of environmental engineering. A nano-iron and hydrogen peroxidecombined technology is adopted to be matched with a filter to conduct deep arsenic-removal on an ammonium sulfate solution by-produced in smoke gas desulfuration, and the problems that as for an ironsalt aeration device in an existing ammonium sulfate solution arsenic-removal method, a large amount of ammonia is volatilized, the process is long, the reaction time is long, and the investment costis high are solved. The arsenic-removal rate reaches 95% or above, the arsenic content of the finally-produced solid ammonium sulfate is greater than or equal to 0.00005%, the requirements of ammonium sulfate superior products in DB53/T 340-2011 'preparation of ammonium sulfate though smelting of sulfur dioxide smoke gas' are met, meanwhile, the technological process is short, the reaction time is short, adaptability is hi