关键词: 焦油渣, 固化, 干馏, 热解, 无害化处理

Abstract: Viscous solid tar residue was produced in the process of gasification and coking of coal, which is extremely difficult to deal with because because of the large amount of harmful substances such as pulverized coal coke powder and coal tar.To solve the problem of harmless treatment of tar residue, tar residue was mixed with compound additives to prepare solidified blocks, and then tar and solid residue were separated by pyrolysis of dry distillation. Through the study of the strength characteristics of the cured block, the optimum technological conditions were determined as the amount of binder 0.15, the ratio of agent to slag 1∶2 and the curing age 7 days. The compressive strength of the cured block can reach 2 MPa after 7 days, the drop strength can reach 94%, and the thermal stability can reach 98%. Tar and high calorific value gases were obtained from the solidified block by pyrolysis of dry distillation, and the tailings of dry distillation meet the requirement of pollutants in sludges (GB 4284—2018), which can be directly discharged as agricultural soil or building materials.

Key words: Tar sludge, Solidification, Dry distillation, Pyrolysis, Harmless treatment