Method for recovering waste water containing phosphorus

Abstract

The invention discloses a method for recovering waste water containing phosphorus, comprising the steps as follows: firstly, refined phosphorus pulp is filtered by a filter (1), and the filtered refined phosphorus pulp and the waste water in a pool (3) for the waste water containing phosphorus are pumped into a mixing groove (2) to be mixed and stirred; secondly, after being mixing and stirred, the pulp is pumped into a phosphoric acid reaction groove (5) for reaction by a pump; thirdly, solid material reacted in the phosphoric acid reaction groove (5) is pumped into a pulp filter (7), filtered gypsum enters a phosphogypsum groove (6), and filtered liquid enters a rare phosphoric acid groove (8); fourthly, waste water exhausted from other equipment (9) in phosphoric acid production is also exhausted into the phosphogypsum groove (6) and is pumped to a phosphogypsum storage yard (10); and fifthly, after being settled, water is directly discharged into the pool (3) for the waste water containing phosphorus, and the first step to the fifth step are repeated. By adopting the method, the recovery of phosphorus can be realized while phosphorus in the waste water is effectively removed, and excellent effects can be realized, so that better benefits are brought for enterprises.

Description

technical field [0001] The invention relates to the treatment and recovery of phosphorus-containing wastewater, in particular to a method for recycling phosphorus-containing wastewater in the production of ammonium phosphate. Background technique [0002] Phosphorus-containing wastewater generated during wet-process phosphoric acid production often contains high phosphorus concentrations. High-concentration phosphorus-containing wastewater usually needs to be treated before it can be discharged. The current treatment method for phosphorus-containing wastewater is mainly to eliminate phosphate in wastewater by adding lime, calcium chloride and other chemical methods to remove phosphorus, and the treatment cost is high. And its products cannot be used reasonably, and when the requirements for phosphorus removal are high, it is usually necessary to adjust the pH value of the wastewater to neutral or weakly alkaline in advance. In addition, the sedimentation performance of the r...

AI Technical Summary

Problems solved by technology

For high-concentration phosphorus-containing wastewater, it usually needs to be treated before it can be discharged. At present, the treatment method of phosphorus-containing wastewater mainly uses chemical methods such as adding lime, calcium chloride and other phosphorus removal agents to eliminate phosphate in wastewater, and the treatment cost is high.

And its products cannot be used reasonably, and when the requirements for phosphorus removal are high, it is usually necessary to adjust the pH value of the wastewater to neutral or weakly alkaline in advance. In addition, the sedimentation performance of the reaction product is poor, and the separation of mud and water is difficult. It is also necessary to add flocculation agent, etc., and the product cannot be reasonably utilized

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