| The comprehensive utilization of automotive wastes was studied in this article by themethods of industrial analysis and elemental analysis, thermogravimetry and differentialthermal analysis, X-ray photoelectron spectroscopy analysis(XPS), the hydrochloricnaphthylethylenediamine spectrophotometry, X-ray powder diffraction(XRD), scanningelectron microscopy(SEM), mechanical performance testing. The effect of sewage sludge, thewaste tire, waste artificial leather and waste real leather used as alternative fuels on nitrogenoxide emissions in cement kilns was studied. The automotive waste fibers interior compositematerials were used to prepare modified polypropylene plastic pellets. The waste glass fibersisolated from the automotive waste fibers interior composite materials were used to preparethe inorganic artificial stone. The conclusions of the study were summarized as follows:(1) The influence factors on concentration of fuel type NOXgenerated by burning thewaste tire, waste artificial leather, waste real leather and sewage sludge were volatilecomponent, the form of N and oxygen content of combustible waste. The higher volatilecomponent, the higher oxygen content of combustible waste and more unstable nitrogenfunctional groups were good for generating the fuel type NOXat the900℃oxidizing burningcondition.(2) when the waste tire, waste artificial leather, waste real leather, sewage sludge weremixed with the coal respectively at the900℃oxidizing burning condition, the concentrationof fuel type NOXgenerated by burning them was lower. In addition, the concentration of fueltype NOXgenerated by burning the waste tire and coal mixture was lower than that generatedby burning the coal, and the reason was that large amounts of reducing hydrocarbonsproduced during the waste tire combustion. Therefore, the mixture of the waste tire, wasteartificial leather, waste real leather, sewage sludge and the coal would reduce theconcentration of the fuel type NOXgenerated by burning coal separately.(3) The concentration of fuel type NOXgenerated by burning the coal mixed with thecement raw materials improved as the temperature rising. The CaO coming from thedecomposition of calcium carbonate minerals played an important role in increasing theconcentration of fuel NOX.(4) Whether all combustible wastes were burned separately or mixed with the coal, thecement raw materials can increase the concentration of fuel type NOXin the combustionprocess, especially for the waste tire and the coal mixture.(5) The modified polypropylene plastic pellets was prepared by the extrusion granulation process using the different proportion of cutting automotive waste glass fiber plastic interiorcomposite materials and waste polypropylene, PP-g-MAH (maleic anhydride) compatilizer asraw materials. The tensile strength, impulse strength and flexural strength of the modifiedplastic pellets had been improved. When the content of modified polypropylene plastic pelletswas24%, the tensile strength, impulse strength and flexural strength increased by41.67%,43.57%,31.38%than those of samples prepared by the waste polypropylene respectively.(6) When the waste glass fibers isolated from the automotive waste fibers interiorcomposite materials were treated with1%of KH550silane coupling agent and added in thealuminate cement quantity by0.13%~0.5%. The3d flexural strength improved by15.74~30.22%and the90d flexural strength improved by20.32~36.16%respectively. Theflexural strength was the best when the waste glass fibers mixed quantity to0.25%.(7) The high flexural strength inorganic artificial stone was prepared with10%of themarble waste powder and90%of aluminate cement as the cementing material, and mixingwith0.25%of the waste glass fibers isolated from the automotive waste fibers interiorcomposite materials. The3d flexural strength was up to11.57Mpa, higher18.67%than thesamples prepared by the pure aluminate cement. The90d flexural strength was up to11.24Mpa, higher20.73%than the samples prepared by the pure aluminate cement. Themarble waste powder reduced the transition of the metastable hydrated calcium aluminate,and inhibited the retraction of the aluminate cement’s long-term strength.These researches were good for classific comprehensive utilization of automotivewastes. |
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