A method for recycling activated carbon after waste mercury catalyst treatment

Abstract

The present invention relates to the technical field of activated carbon recycling in disposing of a waste mercury catalyst, in particular to a method for recycling activated carbon after disposing of the waste mercury catalyst. The method comprises: adjusting waste residue containing activated carbon obtained after disposing of the waste mercury catalyst into seriflux by adding water; after precipitation and filtration of the seriflux, dissolving mercury-containing components and other impurities soluble in water in the filtrate; putting the filtrate into an absorption slot, and putting the precipitate into a distillation furnace to carry out high temperature treatment at a temperature of 850-900 DEG C after drying the precipitate; and subliming PVC after destruction of the PVC in the activated carbon, and emptying gaps of activated carbon, so as to improve the activity effect of the activated carbon. Compared with fresh activated carbon in terms of the activity effect, when disposing of an equal amount of colored wastewater, the dosage of the activated carbon is 0.05-0.07 times higher than the dosage of the fresh activated carbon; and discharge of mercury during the process of recycling and disposing the activated carbon is reduced, and the environmental pollution rate is reduced.

Description

technical field [0001] The invention relates to the technical field of activated carbon recovery in waste mercury catalyst treatment, in particular to a method for recycling activated carbon after waste mercury catalyst treatment. Background technique [0002] Polyvinyl chloride (PVC) has the characteristics of excellent heat resistance, wear resistance, and chemical corrosion resistance. It is widely used in industry, construction, agriculture and other industries. It is the largest general-purpose synthetic resin material in my country. Preparation methods are generally divided into two types: calcium carbide method and ethylene method. Due to the shortage of oil resources and abundant coal resources in my country, PVC produced by the calcium carbide method accounts for the main share, accounting for about 70% of the total PVC. Mercury chloride catalyst (commonly known as mercury catalyst) is used as a catalyst for the synthesis of vinyl chloride (VCM) from acetylene and ...

AI Technical Summary

Problems solved by technology

[0005] It can be seen that in the prior art, for the recovery of activated carbon after waste mercury catalyst treatment, washing or solvent immersion is adopted, so that the gaps on the surface of the activated carbon are restored, and then the effect of improving the activity of the activated carbon is achieved, and the activated carbon is reused. It is used in the preparation process of mercury catalyst, so that activated carbon can be recycled in the production and utilization of mercury catalyst, thereby reducing the waste residue discharge of waste mercury catalyst and the cost of mercury catalyst production; however, due to mercury chloride catalyst (commonly known as mercury Catalyst) is used as the catalyzer of acetylene and hydrogen chloride gas synthesis vinyl chloride (VCM) in the production PVC of calcium carbide method, and then makes the active carrier in the mercury catalyst, and the activity of activated carbon is affected by PVC and is reduced, and in prior art washing Soaking in solvents makes it difficult to expose PVC from the gaps in the activated carbon, thus making it difficult to maximize the activity of activated carbon; for this reason, this researcher combines production practice and the characteristics of PVC materials to study and discuss, in combination with high temperature The excellent parameters of waste mercury catalyst treatment, and the recycling of activated carbon treated with waste mercury catalyst provides a new idea