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In Japan, the seventies has been the inclusion of these two methods and a large number of patents reported the early eighties the two methods will be separated with the magic bination of heavy metals in wastewater treatment to be remended by the new technology. In recent years, the former approach, some deficiencies and problems, selection of ferrite and iron powder factory on the actual number of mercurycontaining waste water was tested, which highlights the advantages of two methods to deal with good, safe, reliable, drainage water can be guaranteed to be less than the national emission standards, technology is simple, applicable to a wide range can be applied in our country. This paper introduces the results of our focus on analysis and parison of two methods.First, the hard oxoprocessferrites law (or called magic oxide pound coprecipitation law) the principle is in includes in the heavy metal ion waste water to join the ferrous salt, then alkalizing neutral, produces two price hydroxides of to the solution ph value and the reaction temperature, may further oxidize the production not homomorphism resultant black ferromagism ferrites like (Fe2O3), brown nonmagic hydration ferric oxide or (FeOOH) the two mixture.The laboratory procedure is, takes certain volume acidic material fluid, joins the ration the FeSO4 solution, then will expect the fluid value transferring to lowacid with the NaOH solution, after the agitation above responded several minutes, the settlement will precipitate, takes the serum determination including the mercury quantity, and will observe the slime magic strong and the weak.The condition experiment indicated but the molysite throws the increment to increase along with the waste water in including the mercury quantity enhances 14 / 47 the waste water including the mercury quantity is 1 10mg/l, the corresponding molysite throws the increment is 。 Reaction time (2) ph value to processes the effect influence to be big, is in under the weak basicity best agitation time and the precipitation time to eliminate the mercury effect to affect not obviously, but to the slime shape, the magic strong and the weak influence big agitation time is 1 minute, the mixing speed for transfers the minute, the precipitation time to processes the effect take the hour as the suitable water temperature to affect not obviously, but to forms the ferrites the speed influence to be temperature Gao Shi (50℃ about), the rate of formation speeds up greatly.The ferrites slime (ph=) soaks about 76 day with the running water, the steep is lower than 20 micrograms each litre including the mercury quantity, also does not elevate along with the immersion number of days increase, explained its chemical stability is very throws adds the Fe2 quantity when 1g/L, probably each cubic meter waste water produces kilograms to do the dregs, its volume approximately for waste water volume extremely three, four.Second, the powdered iron lawpowdered iron method principle is after the powdered iron and the acidification including the mercury waste water mix, through following three kind of functions, in the waste water mercury precipitates the form to filter。（1）Redox reaction and powdered iron surface adsorption。(2)Ferrites response。(3)The coagulation responded that, namely in the solution Fe2 ion alkalifies after the air contact oxidizes Fe2 to bee the hydroxide of iron colloid rapidly, not only these colloids can adsorb the mercury ion, moreover can trap and coerce the dangerous mercury ion and the powdered iron coprecipitation gets down, gets up the good coagulation a result of above three kind of response bined action, this method the ion mercury, the element mercury which exists to the waste water in and the micro granular mercury has the good elimination effect.The experimental material fluid slightly tries to use some chlorine alkali factory, some chemistry reagent plant and some nuclear industry factory reality contains the waste water, is 1~20mg/l (in first two kind of waste water above 90% for dissolves including the mercury quantity in water two price mercury, in latter kind of waste water above 90% for adsorption condition mercury), Experimental uses the HgCl2 disposition the simulation waste water, including the mercury quantity is the 1~30mg/l15 / 47 craft project is, (PH=2~3) contains in the mercury material fluid in the acidification fixed time the quota to throw adds the powdered the intense agitation, expects the fluid PH value nature rise to 8~9, after the precipitation (or battery separator filtration), the serum then discharges.To the material fluid PH value, the powdered iron threw the increment, the sodium sulfide throw factors and so on increment to carry on the condition result indicated that,(1) material fluid PH value to processes the effect influence to be big (suitably take 2~3 as)。 But (2) powdered iron throws the increment to increase the