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

A high-phosphorus iron ore and waste water technology, which is applied in chemical instruments and methods, water/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problems such as the useless value of precipitation, the clogging of the water-passing reaction tower, and the secondary pollution of the environment. , to achieve the effect of easy access, easy control and low cost

Inactive Publication Date: 2013-07-31
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
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  • Application Information

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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, whic...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1. High phosphorus iron ore acid leaching dephosphorization waste water 800mL, containing phosphorus is 0.5g / L, under the condition of stirring speed 150r / min, temperature 20 ℃, add particle size and be less than 0.105mm high phosphorus iron ore adsorbent, put The pH value of the wastewater solution was adjusted to 5.2, the addition amount was 150g / L, stirred for 120min, the stirring was stopped, and filtered. The concentration of phosphorus in the solution after purification is 0.05mg·L -1 , The phosphorus removal rate reaches 99.990%.

Embodiment 2

[0018] Example 2. High phosphorus iron ore acid leaching dephosphorization wastewater 800mL, phosphorus content is 1.4g / L, under the condition of stirring speed 150r / min, temperature 65 ℃, add FeSO 4 Solid 25g / L and perchloric acid 20ml / L with a mass fraction of 70%-72%, adjust the pH value of the wastewater solution to 5.9, stir for 85min, stop stirring, and filter. The concentration of phosphorus in the solution after purification is 0.112mg·L -1 , The phosphorus removal rate reaches 99.992%.

Embodiment 3

[0019] Embodiment 3. High phosphorus iron ore acid leaching dephosphorization waste water 800mL, containing phosphorus is 1.5g / L, under the condition of stirring speed 200r / min, temperature 40 ℃, add particle size and be less than 0.105mm high phosphorus iron ore adsorbent, put The pH value of the wastewater solution was adjusted to 5.5, the amount added was 60g / L, stirred for 60min, the stirring was stopped, and filtered. The concentration of phosphorus in the solution after purification is 0.135mg·L -1 , The phosphorus removal rate reaches 99.991%.

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/58
Inventor 夏文堂袁晓丽尹建国尹立孟安娟周雪娇杨文强
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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