Method for deep removal of phosphorus from high phosphorus iron ore dephosphorization wastewater

Abstract

The invention relates to a method for deep removal of phosphorus from high phosphorus iron ore dephosphorization wastewater. The method is characterized by comprising: according to phosphorus content in high phosphorus iron ore dephosphorization wastewater, adding a dephosphorization agent according to a mass volume concentration of 15-150 g / L, adjusting the pH value to 4.0-6.5, controlling the reaction temperature to 20-90 DEG C, and carrying out a stirring reaction for 10-120 min. According to the present invention, the dephosphorization agent has characteristics of wide sources, easy obtaining, and low cost; deep removal of the phosphorus from the high phosphorus iron ore dephosphorization wastewater can be achieved; and for acid leaching phosphorus-containing wastewater with an initial concentration of 0.5-4.5 g / L, under suitable conditions, the phosphorus concentration in the water can be reduced to less than 0.5 mg / L with the absorption agent, and a phosphorus removal rate can be more than 99.99% so as to meet primary standard phosphorus content requirements of the national second class pollutant integrated discharge standard.

Description

Technical field: [0001] The invention belongs to the field of hydrometallurgy, in particular to a method for deeply removing phosphorus from high-phosphorus iron ore dephosphorization wastewater. Background technique: [0002] The reserves of high-phosphorus iron ore in the country are more than 7.45 billion tons, accounting for 14.86% of the total reserves of iron ore resources in the country. Due to the high phosphorus content, it cannot be used directly, and high phosphorus iron ore needs to be pre-dephosphorized. At present, the widely used pre-dephosphorization method of high-phosphorus iron ore is mainly chemical dephosphorization, especially the acid selective leaching dephosphorization method. The wet selective phosphorus removal process of high-phosphorus iron ore has the advantages of high phosphorus removal rate and low iron loss rate, but after dephosphorization of high-phosphorus iron ore, a large amount of phosphorus-containing weak acid wastewater will be pro...

AI Technical Summary

Problems solved by technology

But its disadvantage is that the generated sediment has almost no use value, and can only be piled up and landfilled as waste residue, which will cause secondary pollution to the environment

Phosphorus removal by crystallization generally adopts the filter-type water flow method, which occupies a small area, has low management costs, and is easy to control. However, when there is a large amount of organic matter in the sewage, it is easy to cause the dephosphorization agent to fail, and a large amount of suspended solids will also Cause blockage of water reaction tower