国际学术英语PPT

1、Preparation of Cementing Materials Using the Lime Neutralization SludgeLeiJie （雷杰）（雷杰）123501040 Class D10School of Metallurgical Science and EngineeringSimulated International Conference on Simulated International Conference on Metallurgical Science and EngineeringMetallurgical Science and Engineeri

2、ngSimulated International Conference on Metallurgical Science and EngineeringSimulated International Conference on Metallurgical Science and Engineering ContentsMaterials and Methods234Conclusions3Results and Discussion1 IntroductionSimulated International Conference on Metallurgical Science and Eng

3、ineeringSimulated International Conference on Metallurgical Science and EngineeringTwo hundred million tons of smelting slag was produced by metallurgical industry, 7 billion tons of smelting slag was banked up until now.4thPbCdZnZnCdPbCdCdPbZnZnCdPbsoilgroundwaterharmIntroductionSimulated Internati

4、onal Conference on Metallurgical Science and EngineeringSimulated International Conference on Metallurgical Science and EngineeringIntroductiongypsum slag +Building materialsA bit of metals were recycled and high energy-consuming and high cost.Low cost and energy-consuming.Key problem is leaching to

5、xicity浸出毒性Materials and MethodsMaterialsExperimental ProcedureLNSFly ashCementCarbide slagDry-type mixingWet-type mixingBall-milling mixingSandsWaterInjection molding and curingCementing materialsCompression strength testLeaching toxicity testSimulated International Conference on Metallurgical Scien

6、ce and EngineeringSimulated International Conference on Metallurgical Science and EngineeringAnalysisMaterials and MethodsResults and Discussion 102030405060700500010000150002000025000Intensity(Counts) Fe(OH)3CaSO4 42H2OCaSO4 41/2H2O2 ()Tab.1. Chemical compositions of LNSFig.1. XRD pattern of LNSMai

7、n components：Dihydrate calcium sulphate (CaSO42H2O), calcium sulfate hemihydrate (CaSO41/2H2O) and a few ferric hydroxide (Fe(OH)3).Simulated International Conference on Metallurgical Science and EngineeringSimulated International Conference on Metallurgical Science and EngineeringTab.2. Leaching to

8、xicity of original LNSThe leaching toxicity test was focused on lead and nickel.Results and Discussion 铅，铅，PbPb 镍镍，NiNiTab.3. Orthogonal array of reactant ratioFig.2. Effects of reactant ratio on concentration of heavy metals in leachateResults and DiscussionTab.4. Conditional optimality experiments

9、 table of reactant ratioFig.3. Effects of reactant ratio on compression strength and concentration of heavy metals in leachate: a-Compression strength; b-Concentration of leachate Results and Discussion2.5 MPaSimulated International Conference on Metallurgical Science and EngineeringSimulated Intern

10、ational Conference on Metallurgical Science and Engineering 0246810 Compression strength/(MPa)Ratio of aggregate-to-filler0: 10.5: 11: 12: 13: 1(a) Fig.4. Effects of ratio of aggregate-to-filler on compression strength and concentration of heavy metals in leachate: a-Compression strength; b-Concentr

11、ation of leachateResults and DiscussionSimulated International Conference on Metallurgical Science and EngineeringSimulated International Conference on Metallurgical Science and Engineering Fig.5. Effects of curing time on compression strength and concentration of heavy metals in leachate: a-Compres

12、sion strength; b-Concentration of leachateResults and DiscussionSimulated International Conference on Metallurgical Science and EngineeringSimulated International Conference on Metallurgical Science and EngineeringTab.5. Effects of mixing types on compression strength and concentration of heavy meta

13、ls in leachateResults and DiscussionSimulated International Conference on Metallurgical Science and EngineeringSimulated International Conference on Metallurgical Science and EngineeringConclusionsThe optimum operating process parameters m(LNS):m(fly ash):m(cement):m(carbide slag) = 30:35:30:8 The ratio of aggregate-to-fi