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Application of ammonium magnesium phosphate/nano magnesium hydroxide in treatment of wastewater containing heavy metals

A nano-magnesium hydroxide and magnesium ammonium phosphate technology, applied in the field of environmentally friendly materials, can solve the problems of high comprehensive treatment costs and unbearable sewage enterprises, and achieve the effect of resource utilization

Active Publication Date: 2019-11-12
CHINA UNIV OF GEOSCIENCES (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the complexation removal method and adsorption method have been applied industrially. The treatment effect is good and the removal rate is high. Combined with the chemical precipitation method, a better comprehensive treatment effect can be achieved and the cost can be reduced. However, the comprehensive treatment cost is relatively high, making the sewage Enterprises can't afford it

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The present embodiment provides a kind of nano-magnesium hydroxide slurry, and the preparation method comprises the following steps:

[0040] 1) Lightly burned magnesium powder with an MgO content of about 65% is used as raw material, mixed with sodium citrate and water at a mass ratio of 1:0.03:4, and the pH of the mixed system is controlled at 10. Carry out ultra-fine grinding; during grinding, the temperature is controlled at 80°C, the grinding time is 180 minutes, and the grinding speed is 1300 rpm, wherein the grinding medium is a steel ball with an average particle size of 1 mm;

[0041] 2) Add phthalate to the system in step 1), and obtain highly dispersed nano-magnesium hydroxide slurry after sufficient modification; wherein, the mass ratio of light-burned magnesium powder to phthalate is 1:0.03.

[0042] The average particle diameter of the nano-magnesium hydroxide slurry that the present embodiment obtains is 80nm, and at least 90% of the particles have a partic...

Embodiment 2

[0044] The present embodiment provides a kind of nano-magnesium hydroxide slurry, and the preparation method comprises the following steps:

[0045] 1) Use lightly burned magnesium powder with an MgO content of about 65% as raw material, mix it with sodium citrate and water at a mass ratio of 1:0.02:4, control the pH of the mixed system at 11, and mix it in a medium stirring mill Carry out ultra-fine grinding; during grinding, the temperature is controlled at 75°C, the grinding time is 160 minutes, and the grinding speed is 1300 rpm, wherein the grinding medium is a steel ball with an average particle size of 2mm;

[0046] 2) Add phthalate to the system in step 1), and obtain highly dispersed nano-magnesium hydroxide slurry after sufficient modification; wherein, the mass ratio of light-burned magnesium powder to phthalate is 1:0.04.

[0047] The average particle diameter of the nano-magnesium hydroxide slurry that the present embodiment obtains is 100nm, and at least 90% of t...

Embodiment 3

[0049] The present embodiment provides a kind of nano-magnesium hydroxide slurry, and the preparation method comprises the following steps:

[0050] 1) Lightly burned magnesium powder with an MgO content of about 65% is used as raw material, mixed with sodium citrate and water at a mass ratio of 1:0.02:5, and the pH of the mixed system is controlled at 11. Carry out ultra-fine grinding; during grinding, the temperature is controlled at 80°C, the grinding time is 180 minutes, and the grinding speed is 1400 rpm, wherein the grinding medium is a steel ball with an average particle size of 2mm;

[0051] 2) Add phthalate to the system in step 1), and obtain highly dispersed nano-magnesium hydroxide slurry after sufficient modification; wherein, the mass ratio of light-burned magnesium powder to phthalate is 1:0.04.

[0052] The average particle diameter of the nano-magnesium hydroxide slurry that the present embodiment obtains is 80nm, and at least 90% of the particles have a parti...

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Abstract

The invention provides an application of a magnesium ammonium phosphate / nano magnesium hydroxide mixture in treatment of wastewater containing heavy metals. In the application, the molar ratio of theammonium magnesium phosphate to the nano magnesium hydroxide to the heavy metals is 1:(2-10):(0.1-0.8), wherein the ammonium magnesium phosphate / nano magnesium hydroxide can be obtained through conversion from low-purity magnesium oxide which is a waste material. According to the method, the low-purity magnesium oxide waste can be converted into the nanoscale high-dispersion magnesium hydroxide, which can be used as a raw material for precipitating ammonia nitrogen in sewage through a magnesium ammonium phosphate method, resource utilization of low-purity magnesium oxide and low-grade magnesite is achieved, meanwhile, the heavy metals in heavy metal wastewater can be removed through the obtained magnesium ammonium phosphate and magnesium hydroxide mixture, and ammonia nitrogen and heavy metal ions in rare earth wastewater are removed at the same time.

Description

technical field [0001] The invention relates to the technical field of environment-friendly materials, and more specifically relates to the application of a magnesium ammonium phosphate / nano-magnesium hydroxide mixture in treating heavy metal-containing wastewater. Background technique [0002] The removal methods of heavy metal ions in sewage include adsorption removal method, chemical precipitation method and polymer resin complexation method. For the removal of heavy metals, researchers have done a lot of work by using polymer material complexation removal and adsorption removal methods, and have achieved more success. Adsorbent materials mainly include activated carbon and various natural porous minerals. At present, the complexation removal method and adsorption method have been applied industrially. The treatment effect is good and the removal rate is high. Combined with the chemical precipitation method, a better comprehensive treatment effect can be achieved and the...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F1/62C01F5/14B82Y40/00C02F101/16
CPCB82Y40/00C01F5/14C01P2004/64C02F1/586C02F1/62
Inventor 杜高翔谢艳王佼任凤国李男帅欢
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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