Acidic waste water treatment agent capable of regenerative cycle use and preparation method thereof

A technology for acid waste water and treatment agent, applied in the field of environmental protection, can solve the problems of difficult regeneration of treatment agent, secondary pollution, complicated process, etc., and achieve the effect of good effect and simple preparation process.

Inactive Publication Date: 2007-02-28
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are disadvantages that the treatment agent is difficult to regenerate and will cause secondary pollution
[0004] CN02148522.4 provides a kind of inorganic salt in industrial acidic wastewater waste liquid as an active ingredient, by adding carbonate rock or calcareous material or a solution containing caustic soda, etc., while treating waste water waste liquid, it can be used to prepare waste water for drinking The disadvantage of hydrotalcite products in water treatment and other fields is that the process is complex, and it is necessary to detect the content of metal ions in the wastewater and add an appropriate amount of metal ions to the wastewater to make the ratio of divalent and trivalent metal ions in the reactor appropriate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Preparation of treatment agent: 0.36 moles (88.7 grams) of MgSO 4 ·7H 2 O and 0.1125 mol (74.9 g) Al 2 (SO 4 ) 3 18H 2 O was dissolved in 315 ml of tap water to form a mixed salt solution, and 0.936 moles (37.4 grams) of NaOH and 0.45 moles (47.7 grams) of NaOH 2 CO 3 Dissolve in 315 ml of tap water to form a mixed alkali solution. Under full stirring, add the salt solution and alkali solution dropwise to 50 ml of tap water at the same time, at a rate of 15 ml / min. After the addition is complete, heat up to 80°C to crystallize hours, a white precipitate was generated, which was separated by centrifugation, and the separated product was washed with tap water and dried at 90° C. to obtain a hydrotalcite with a magnesium-aluminum ratio of 1.6:1. Put the hydrotalcite precursor in a muffle furnace and heat up to 500°C at a rate of 1°C / min and roast for 3 hours to obtain a composite metal oxide with a magnesium-aluminum ratio of 1.6:1: Mg 0.62 Al 0.38 O(OH) 0.38 .

...

Embodiment 2

[0018] Preparation of treatment agent: 0.36 moles (92.3 grams) of Mg(NO 3 ) 2 ·6H 2 O and 0.225 moles (84.4 grams) of Al(NO 3 ) 3 9H 2 O was dissolved in 1000 ml of tap water to form a mixed salt solution, and 0.936 moles (52.4 grams) of KOH and 0.45 moles (62.1 grams) of KOH 2 CO 3 Dissolve in 235ml of tap water to make a mixed alkali solution. Under full stirring, add the alkali solution dropwise into the salt solution at a rate of 30ml / min. After the addition is complete, heat up to 60°C to crystallize for 6 hours, forming a white precipitate , filtered with a funnel, and the separated product was washed with tap water and dried at 80°C to obtain a hydrotalcite with a magnesium-aluminum ratio of 1.6:1. Put the hydrotalcite precursor in a muffle furnace and heat up to 430°C at a rate of 3°C / min and roast for 3 hours to obtain a composite metal oxide with a magnesium-aluminum ratio of 1.6:1: Mg 0.62 Al 0.38O (OH) 0.38 .

[0019] The acid wastewater treatment process...

Embodiment 3

[0022] Preparation of treatment agent: 0.36 moles (88.7 grams) of MgSO 4 ·7H 2 O and 0.072 mol (48.0 g) Al 2 (SO 4 ) 3 18H 2 O was dissolved in 180 ml of tap water to form a mixed salt solution, and 1.764 moles (70.6 grams) of NaOH and 0.288 moles (30.5 grams) of NaOH 2 CO 3 Dissolve in 1000ml of tap water to make a mixed alkaline solution. Under full stirring, add the salt solution dropwise into the alkaline solution at a rate of 5ml / min. After the addition is complete, heat up to 100°C to crystallize for 0.5 hours to form a white precipitate , filtered with a funnel, the separated product was washed with tap water, and dried at 70°C to obtain a hydrotalcite with a magnesium-aluminum ratio of 2.5:1. Put the hydrotalcite precursor in a muffle furnace and heat up to 550°C at a rate of 5°C / min and roast for 3 hours to obtain a composite metal oxide with a magnesium-aluminum ratio of 2.5:1: Mg 0.71 Al 0.29O (OH) 0.29 .

[0023] Acidic wastewater treatment process: Weigh...

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PUM

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Abstract

The invention discloses a renewable industrial acid waste water disposing agent and preparing method, which is characterized by the following: adopting magnesium hydrotalcite as former; sintering to obtain the magnesium composite metal oxide; adopting hydrotalcite material structure to dispose acid waste water.

Description

technical field [0001] The invention relates to a regenerable and recyclable treatment agent for industrial acid wastewater and a preparation method thereof, belonging to the field of environmental protection. Background technique [0002] Mining ore dressing, chemical, pharmaceutical, metallurgical and other industries will produce a large amount of acid wastewater. In the prior art, the treatment methods of industrial acid wastewater include sulfate-reducing bacteria method, activated carbon adsorption method and coagulation sedimentation method, catalytic oxidation method and wet oxidation method, lime neutralization precipitation treatment method and so on. Among them, the use of cheap and easy-to-obtain limestone and lime as a neutralizing agent is the most widely used method. However, the lime neutralization and precipitation treatment method has disadvantages such as large dosage, poor working conditions and unsatisfactory effect. [0003] CN86106532A provides an ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/66
Inventor 赵芸矫庆泽刘睿
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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