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Preparation method of heavy metal ion removal sieve

A technology for removing heavy metals and ion sieves, which is applied in non-metallic elements, chemical instruments and methods, metallurgical wastewater treatment, etc., can solve the problems of high treatment cost, easy resin poisoning, etc. cost effect

Inactive Publication Date: 2012-10-03
SHENZHEN HUASHUI ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for preparing a heavy metal ion sieve, which overcomes the defects of easy poisoning and high processing cost of the existing ion exchange method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Mix 1.0mol / L potassium pyrophosphate solution with 1.0mol / L sodium silicate under constant stirring. The weight percentage is potassium pyrophosphate 15%, sodium silicate 25% (the following percentages are all weight percentages).

[0025] (2) Add 2.0mol / L hydrochloric acid dropwise to the above mixed solution, and then adjust the pH value to 3.

[0026] (3) Slowly drop 1.0mol / L titanium tetrachloride solution into the above solution with a separatory funnel, while fully stirring to make the reaction complete. The weight percent of titanium tetrachloride solution is 30%.

[0027] (4) After the reaction no longer produces precipitation, adjust the pH value of the solution to 6, age for 16 hours, and then adjust the pH value to neutral with acid or alkali.

[0028] (5) Centrifugal separation, put the precipitated part in an oven for drying at 60°C, pour it into 2.0mol / L nitric acid to burst, and use nitric acid to contact it repeatedly to convert it into a hydrogen-...

Embodiment 2

[0037] (1) Mix 1.5mol / L potassium pyrophosphate solution with 1.5mol / L sodium silicate under constant stirring. The weight percentage is potassium pyrophosphate 20%, sodium silicate 18% (the following percentages are all weight percentages).

[0038] (2) Add 2.5mol / L hydrochloric acid dropwise to the above mixed solution, and then adjust the pH value to 2.

[0039] (3) Slowly add 1.5mol / L titanium tetrachloride solution dropwise into the above solution with a separatory funnel, and stir fully at the same time to make the reaction complete. The weight percentage of titanium tetrachloride solution is 27%.

[0040] (4) After the reaction no longer produces precipitation, adjust the pH value of the solution to 5, age for 20 hours, and then adjust the pH value to neutral with acid or alkali.

[0041] (5) Centrifugal separation, put the precipitated part into an oven for drying at 90oC, pour it into 1.5mol / L nitric acid to burst, and use nitric acid to contact it repeatedly to con...

Embodiment 3

[0049] (1) Mix 2.0mol / L potassium pyrophosphate solution with 2.0mol / L sodium silicate under constant stirring. The weight percentage is potassium pyrophosphate 20%, sodium silicate 20% (the following percentages are all weight percentages).

[0050](2) Add 3.5mol / L hydrochloric acid dropwise to the above mixed solution, and then adjust the pH value to 1.

[0051] (3) Slowly add 2.0mol / L titanium tetrachloride solution dropwise into the above solution with a separatory funnel, while fully stirring to make the reaction complete. The weight percentage of titanium tetrachloride solution is 20%.

[0052] (4) After the reaction no longer produces precipitation, adjust the pH value of the solution to 8, age for 24 hours, and then adjust the pH value to neutral with acid or alkali.

[0053] (5) Centrifugal separation, put the precipitated part in an oven for drying at 120°C, pour it into 1.0mol / L nitric acid to burst, and use nitric acid to contact it repeatedly to convert it into ...

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Abstract

The invention discloses a preparation method of a heavy metal ion removal sieve. The preparation method comprises the steps as follows: firstly, synthesizing a pyrophosphate polyoxometalate type exchanger-titanium silicate pyrophosphate by potassium pyrophosphate, sodium silicate and titanium tetrachloride; and secondly, preparing the titanium silicate pyrophosphate, a mixed solution of trivalent chromic ions, copper ions, zinc ions and cadmium ions with a certain concentration, and nitric acid into the heavy metal ion removal sieve according to the chemical sieve preparation means by using the embedding-extraction technology. The heavy metal ion removal sieve prepared by the preparation method can directly purify pollution in electroplated wastewater, particularly heavy metal pollution in the electroplated wastewater, and cannot bring new pollution; compared with the conventional chemical precipitation method and the ion resin exchange method, the specific ion sieve technology of the heavy metal ion removal sieve has the advantages of high efficiency, low possibility of poisoning, low cost, easiness in operation, low energy consumption and the like, and the heavy metal ion removal sieve can be recycled; and the electroplated wastewater treated with the heavy metal ion removal sieve is used, so that the national emission standard can be completely complied and safety emission or cyclic utilization can be realized. Therefore, the heavy metal ion removal sieve has a broad prospect of application.

Description

technical field [0001] The invention relates to a method for preparing a sieve for removing heavy metal ions, which comprises preparing titanium pyrophossilicate, and then using a mixed solution of titanium pyrophossilicate, copper, zinc, nickel, cadmium ions, and trivalent chromium ions and nitric acid to prepare heavy metal ions sieve step. Background technique [0002] Electroplating is the process of using electrochemical methods to protect or decorate the surface of metal or non-metal products. The electroplating industry is one of the major polluting industries in the world. Because many complexing agents and stabilizers are usually added to the electroplating solution, the electroplating wastewater is rich in heavy metals, which is highly toxic, difficult to treat, and harmful to the environment. It is a limitation The two bottlenecks of electroplating wastewater treatment and recycling. [0003] As a commonly used method for the treatment of electroplating wastewat...

Claims

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Application Information

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IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F1/62C02F103/16
Inventor 王林双
Owner SHENZHEN HUASHUI ENVIRONMENTAL PROTECTION TECH
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