Study Of The Mechanism About The Migration And Curing Of Heavy Metals From Waste In The Clinker Cement Production Process

This thesis is based on the National Natural Science Foundation of" Study on the solidification mechanism and migration of hazardous constituents of hazardous waste in cement kiln "(50802025),carried out with different heavy metals on the role of cement clinker burning for basic research.In this paper, analysis and comparison of existing methods of hazardous industrial waste treatment, based on the use of cement rotary kiln described incineration of hazardous waste containing heavy metals advantages. Targeted curing of cement clinker, a raw material for heavy metals sintering experiments, chemical analysis, XRD, X-ray fluorescence analysis SEM+EDS, ICP and other experiments are made to research on the effects of the heavy metals on cement clinker system burnability, mineral phase matching and performance and other aspects of clinker the impact of comprehensive evaluation of the doping effect of heavy metals. In addition, by the use of SEM+EDS analysing the solidification contents of heavy metals (Cu, Ni, Pb, Mn, V) in the C3S, C2S, and the intermediate phase,discuss the curing behavior and mechanism of heavy metals in the mineralogical phase. In the experimental program and experimental conditions, the main results are as follows:(1)It has carried on the preliminary analysis and the discussion to the theory of cement kiln joint disposal hazardous waste containing heavy metals.(2)The glycerin-alcohol experiments show that CuO, PbO and Pb3O4 etc can greatly reduce the content of f-CaO,and improve the burnability of raw materials.There is an optimal parameter, beyond the scope the content of f-CaO increasing. If the contents of Ni, Ni2O3, Pb all are between 0.5% and 2.0%, with the increase of dosage, it's easier to burn; in a way MnO2 promote the burnability of raw materials but not significant; V2O5 prevent the burnability of raw materials.(3)XRD and SEM analysis shows that:CuO, PbO, Pb3O4, Ni, Ni2O3 and Pb all are conducive to the clinker burning; MnO2 has little effect on its improvement; V2O5 have an inhibitory action on the clinker burning. The addition of V2O5 in clinker burning reduces the contents of C3S and C2S while it increases the middle phase and f-CaO contents.(4)SEM+EDS analysis shows that:Cu2+ has an easy solution in the middle phase. Ni has a rich solution in the A ore enrichment. Mn4+ is rich in the middle phase but small amounts occurs in the B minor. V5+ has easy solution in the B ore, but hard solution in the A ore. blended Pb, PbO, Pb3O4 concerned, we can not clearly distinguish what minerals in the clinker is rich in Pb, so we can say that they have a relatively uniform distribution in every mineral phases.(5)The expertment of Extraction toxicity shows that:the cure rate of heavy metals in the type of composite mixing has more efficient than single doping. Leaching amount of heavy metal ions vary by the type of heavy metals, and has no direct relationship with its content in the test block. When the blending sludge, phosphors, inks and used batteries by 2.0%, it contains the heavy metals in more than 99% cure rate, which demonstrates the use of clinker to deal with the heavy metals in hazardous waste works well.