Phosphate radical ion recycling method for activated carbon washes with method of phosphoric acid

Abstract

The invention belongs to the recycling field of phosphoric acid (salt) in the production process of activated carbon, and particularly relates to a phosphate radical ion recycling method for activated carbon washes with the method of phosphoric acid, which includes the following steps: enabling calcium hydroxide to be prepared into calcium hydroxide suspension, adding the suspension to washes generated in the activated carbon production process with the method of phosphoric acid, fully mixing for reaction to form calcium phosphate sediment, filtering, enabling the calcium phosphate sediment to be prepared into pulp, adding concentrated sulfuric acid, fully mixing for reaction to generate phosphoric acid and calcium sulfate sediment, and filtering and recycling phosphoric acid. The phosphate radical ion recycling method utilizes reaction between calcium hydroxide and waste water containing phosphate radical ions to generate high-purity calcium phosphate sediment and recyclable water with low content of phosphate radical ions, thereby recycling phosphate radical ions and saving water for production. The phosphate radical ion recycling method is simple in process operation, easy to popularize industrially and low in production cost, and has remarkable economic benefits. Raw materials can be obtained easily.

Description

technical field [0001] The invention belongs to the field of phosphoric acid (salt) recovery in the production process of activated carbon, and more specifically relates to a method for recovering phosphate ion from activated carbon washing wastewater by phosphoric acid method. Background technique [0002] Phosphorus is an important part of living organisms, and is widely used in industry, agriculture, medicine, biology and other industries. However, because a large amount of phosphorus is discharged along with the wastewater, the water body becomes eutrophic. Recycling and reusing phosphorus resources is the fundamental way to solve this contradiction. Recycling phosphorus can reduce the discharge concentration of phosphorus in wastewater on the one hand, and obtain valuable phosphorus resources on the other hand, which is a good way to achieve a win-win situation of environmental and economic benefits. Since phosphorus resources flow individually, phosphorus will become...

AI Technical Summary

Problems solved by technology

The calcium phosphate-containing mixture precipitate depends on the additives added during the treatment process, or it can be sent to a professional solid waste treatment unit or to a fertilizer factory for treatment. Due to the low solid content of the calcium phosphate mixture, the transportation and treatment costs are high.

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