Combined treatment method for acid sludge and desulfurization ash

Abstract

The invention relates to the field of comprehensive utilization of industrial wastes and particularly relates to a combined treatment method of waste acid sludge in the lubricating oil recycling industry and desulfurization ash in the dry-process/semidry process flue gas desulfurization industry. The combined treatment method of the acid sludge and the desulfurization ash comprises the following steps: after pulping the desulfurization ash, mixing and aerating with the acid sludge, and performing phase separation by virtue of emulsion-breaking and neutralizing effects, wherein an oil phase is utilized as fuels, a water phase is returned to a desulfurization ash pulping system for recycling, and a solid phase is utilized as a building material. The combined treatment method disclosed by the invention is simple in process, environmentally friendly, and capable of realizing innocent treatment of harmful wastes and developing a new way for recycling the harmful wastes, and has good economic benefits and environmental benefits.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of industrial waste, in particular to a method for joint disposal of waste acid residue in the lubricating oil regeneration industry and desulfurization ash in the dry / semi-dry flue gas desulfurization industry. Background technique [0002] Lubricating oil, which is widely used in steel rolling, machinery, electric power, transportation, chemical industry, petroleum and other fields, becomes waste oil due to deterioration after a period of use. In view of the serious situation of energy depletion and the pollution of waste lubricating oil to the environment, the regeneration of waste lubricating oil has attracted the attention of various countries. [0003] At present, there are dozens of waste lubricating oil regeneration processes, mainly including sulfuric acid-clay clay method, distillation-acid washing-clay clay method, distillation-solvent extraction method, furfural refining, molec...

AI Technical Summary

Problems solved by technology

Its by-product dry / semi-dry desulfurization ash (hereinafter referred to as desulfurization ash) is usually in the form of off-white or gray-brown powder, with strong alkalinity, fine particles, complex components, unstable properties, and contains CaSO 4 2H 2 O, CaSO 3 1 / 2H 2 O, CaCO 3 , f-CaO and Ca(OH) 2 Many calcium-based compounds, such as calcium-based compounds, are easy to decompose at high temperature, easy to oxidize at room temperature, easy to raise dust during transportation, and easy to burst building materials, so it is very difficult to use

[0009] Desulfurization ash treatment and utilization technologies mainly focus on the production of unburned bricks, steam-cured bricks, cement retarders, cementitious materials, dry-mixed mortars, roadbed materials, ceramics, gypsum products, panels for composite wallboards, building blocks, filling materials, slag / fly ash composite admixture and other building materials, but in the end because of the instability of desulfurization ash and the small amount of actual blending, industrial production cannot be realized

There are also studies on the use of desulfurization ash thermal decomposition to produce acid (CN200910180052.0), catalytic oxidation to gypsum (CN200910263921.6), preparation of nano calcium carbonate (CN201110209483.2), preparation of wet desulfurizer (CN200910194833.5), production of potassium calcium silicon Sulfur compound fertilizer (CN200610123966.X) and desulfurization ash modification (CN201110072276.7) and other processes, but due to high energy consumption, high production costs, large potential impact on the environment, and complicated product purification, are currently only in the conceptual design and laboratory research stage

[0010] At present, there is no proper way of large-scale utilization of desulfurization ash. Most of the desulfurization ash is piled up and discarded. The sky is full of dust in sunny days, and the sewage flows in rainy days, causing serious secondary pollution to the environment. It has become a problem that flue gas desulfurization enterprises must face.

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