Abstract
Blast furnace slag, which is the main by-product of the ironmaking process discharged at 1450 °C, contains high-quality sensible heat, while oily sludge is the main solid waste produced in the process of gas exploration, storage, and transportation. The energy and resource utilization of blast furnace slag is complementary to the environmentally friendly treatment of oily sludge, which has provided a new idea for the multi-factor synergistic cycle and energy transformation of the two wastes. The pyrolysis of the oily sludge with the molten blast furnace slag was conducted in the current paper. Results showed that the oily sludge was rapidly pyrolyzed, and the heavy metal elements in the oily sludge were solidified. The solidification rate of the heavy metals exceeds 90%, except for vanadium. The reconstituted water-quenched blast furnace slag still has good activity, and it will not affect the further use of the slag after pyrolysis (BFS-P).
Highlights
Blast furnace slag (BFS) is the most important by-product in iron and steel production, with an annual emission of more than 300 million tons at a temperature of 1450 ◦ C
Fig-are shown in Theappearance appearance morphology of the and BFS
The original BFS mainly consists of a glass phase with amorphous peak and substantially small tricalcium aluminate (Ca3Al2O6), while the peak an amorphous peak and substantially small tricalcium aluminate (Ca3 Al2 O6 ), while the was more obviously in the BFS after pyrolysis (BFS-P)
Summary
Blast furnace slag (BFS) is the most important by-product in iron and steel production, with an annual emission of more than 300 million tons at a temperature of 1450 ◦ C. The existing treatment techniques for OS include the heat treatment process, chemically enhanced solid–liquid separation, bioremediation, and solvent extraction [23,24,25,26] Among these techniques, the pyrolysis technology is widely used since it has the advantages of thorough disposal, lower pollution, significant reduction of volume and capacity, and high energy reutilization. The OS contains numerous petroleum-type organic compounds and heavy metals, so the pyrolysis process of OS with BFS will recover the waste heat of the blast furnace slag, and obtain some recyclable pyrolysis products from the OS and can harmlessly treat the heavy metals in OS. The objectives of this work are to investigate the reliability of the pyrolysis of biomass with hot BFS, to harmlessly treat the OS, and the reutilization of the waste heat of the BFS
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