The Research On The Aerated Concrete Prepared With Petroleum Coke Desulfuration Residues

Petroleum coke, produced as by-products in Petrochemical industry, can bedivided into high-sulfur (above3percent) and low-sulfur(less than3percent). How toutilize the high-sulfur petroleum coke to increase economic benefits has been thefocus in petrochemical industry. Circulating fluidized bed combustion technology hasgain the rapid development for its High efficiency and low pollution. High-sulfurpetroleum coke could be used as its fuel. The sulfur in the fuel could be removed afterthe burning of bed material mixed with Calcium carbonate, left Calcium sulfate withother products called petroleum coke desulfuration residues.The subject is based on the program of the research of the application of milledhigh-sulfur petroleum coke desulfuration residues and the preparation technology ofaerated concrete with high-sulfur petroleum coke desulfuration residues. It mainlyincludes:1）basic properties of petroleum coke desulfuration residues，includingchemical compositon, mineral constituent, exothermic character, normal consistencywater consumption, setting time and Investigate the Hydration mechanism ofdesulfurized petroleum coke desulfuration residues.2)Preparing the aerated concretewith petroleum coke desulfuration residues instead of lime and adjusting the ratiofrom four sides including the ratio of water with mixture, the amount of lime andpetroleum coke desulfuration residues, the amount of cement and the amount ofAluminum paste to choose the ratio accord with the degree of B06and A3.5.3)Conducting a series of industrial experiments with the optimal ratio also investgatingthe economic feasibility of the preparation with petroleum coke desulfuration residuesby cost analysis.The results are as follows:1)the content of Calcium oxide in petroleum cokedesulfuration residues is reach up to48-51percent. The Digestion rate is fast and canreach the Maximum temperature in2minutes yet drop quickly.2)after mixed withwater, CaO exiting in petroleum coke desulfuration residues can turn into Ca(OH)2and involves the Hydration reaction of cement and Fly ash on contrast CaSO4Ⅱonly when under the condition of steam pressing. There are large amount sillimanites,tobermorites and a small quantity of porzites, hydro garnet and CSH in aeratedconcrete.3)The property of aerated concrete could satisfy the degree of B06and A3.5 of dry density under the conditions as follows: the ratio of water to mixture is0.7,thecontent of air entraining agent is between1.0‰-1.5‰, the content of CalcareousmaterialsⅠ is up to28%,the content of cement is between10%-15%and thepetroleum coke desulfuration residues instead the lime with the rate between80%-100%.4)The results of industrial experiments satisfying the anticipate targets areaccord with ones in library. When petroleum coke desulfuration residues fully insteadlime, there could be￥4.8million reduced in the cost of Production line with theoutput of120thousands Cubic meter a year through economic analysis.The utilization rate of aerated concrete produced from petroleum cokedesulfuration residues and fly ash both belonging to Industrial wastes can reach90percent. With the advantages of environment-protection and re-use, the aeratedconcrete meet the demands of recycling economy and have stronger marketcompetitiveness.