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

A phosphate ion and recovery method technology, which is applied in the field of phosphate ion recovery from phosphoric acid method activated carbon washing wastewater, can solve the problems of high transportation and treatment costs, low solid content of calcium phosphate mixture, etc., achieves low production cost and is easy to promote industrialization , easy-to-achieve

Inactive Publication Date: 2012-07-04
FUJIAN YUANLI ACTIVE CARBON
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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 tre

Method used

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

Examples

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Effect test

Embodiment 1

[0020] Use 20% calcium hydroxide emulsion to react with production wastewater containing phosphoric acid 2000g / ml, the reaction pH is 9.5, the calcium phosphate sludge after reaction precipitation is filtered, and the filtrate is used as the washing of phosphoric acid activated carbon, and the formed solid content is 30% The calcium phosphate filter cake is made into a slurry, and calcium phosphate (dry basis) and 98% concentrated sulfuric acid are added dropwise at a mass ratio of 0.8:1. After the reaction is complete, filter and separate, the reclaimed phosphoric acid filtrate has a phosphoric acid content of 8%, and the recovery rate of phosphoric acid is 95%.

Embodiment 2

[0022] Use 20% calcium hydroxide emulsion to react with phosphoric acid 1000g / ml production wastewater, the reaction pH9, the calcium phosphate sludge after the reaction precipitation is filtered to form calcium phosphate filter cake, and the filtrate is used as the washing of phosphoric acid activated carbon to form 40 % calcium phosphate filter cake to make a slurry, calcium phosphate (dry basis) and 98% concentrated sulfuric acid are added dropwise at a mass ratio of 1.2:1. After the reaction is complete, filter and separate, the phosphoric acid filtrate phosphoric acid content of recovery is 14%, and the recovery rate of phosphoric acid is 93%.

Embodiment 3

[0024] Use 20% calcium hydroxide emulsion to react with production wastewater containing phosphoric acid 6000g / ml, the reaction pH is 10, the calcium phosphate sludge after reaction precipitation is filtered to form calcium phosphate filter cake, and the filtrate is used as the washing of phosphoric acid activated carbon to form 35 % calcium phosphate filter cake to make a slurry, calcium phosphate (dry basis) and 98% concentrated sulfuric acid are added dropwise at a mass ratio of 1:1. After the reaction is complete, filter and separate, the reclaimed phosphoric acid filtrate has a phosphoric acid content of 10%, and the recovery rate of phosphoric acid is 93%.

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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...

Claims

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Application Information

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IPC IPC(8): C01B25/18
Inventor 卢元健缪存标占礼万方世国
Owner FUJIAN YUANLI ACTIVE CARBON
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