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Sulfide heavy metal chelating agent and preparation method thereof

A heavy metal trapping agent and sulfide technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of reducing the removal effect of heavy metal ions, hydrogen sulfide odor, oxidation side reactions, etc., and it is not easy to achieve The effects of secondary pollution, dense flocs, and simple equipment

Active Publication Date: 2010-01-20
南京正隆环保工程有限公司
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AI Technical Summary

Problems solved by technology

However, sodium sulfide will produce hydrogen sulfide odor during use, and oxidation side reactions will occur when dissolving, and the heavy metal sulfide precipitated floc particles are small and the sedimentation time is too long, which reduces the removal effect of heavy metal ions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Dissolve 260g of sodium sulfide in 1000mL of purified water, place it in a reactor, and heat it in a constant temperature water bath at 70°C. Control stirring rate 30r.min -1 , under stirring, add 1g of dispersant sodium silicate; after the sodium silicate is completely dissolved, add 35g of sulfur to make the surface of sulfur wet and form a sulfur suspension. The reaction was controlled for 20 minutes, and the sulfur gradually dissolved slowly. Add 20% flocculation enhancer aluminum sulfate or aluminum chloride. Stir and cool to room temperature to obtain a brown-red heavy metal scavenger.

Embodiment 2

[0020] 260g of sodium sulfide was dissolved in 1000mL of purified water and placed in a reactor. See Table 1 for other parameters.

Embodiment 3

[0022] 260g of sodium sulfide was dissolved in 1000mL of purified water and placed in a reactor. See Table 1 for other parameters.

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PUM

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Abstract

The invention discloses a sulfide heavy metal chelating agent and a preparation method thereof; the method adopts a reaction between sodium sulfide water solution and sulfur to generate sodium polysulfide and uses aluminum sulfate, aluminium chloride and other aluminum salts as stabilizers so as to strengthen the flocculation effect and increase the catching effect on heavy metal ions. The chelating agent is used to treat the industrial wastewater containing heavy metal ions, can effectively restrain the generation of hydrogen sulfide, and reacts with all kinds of heavy metal ions quickly at room temperature to generate water insoluble sulfides precipitate, wherein, the particles of the produced sulfides is large, the floccule is dense and the settling time is reduced so that the concentrations of the heavy metal ions in wastewater are easy to be reduced below the national discharge standard, the generated residue can be used for recycling heavy metals and secondary pollution is not easy to cause; the method of the invention has simple devices, convenient operation and low cost, thus being applicable to the wastewater treatment in industries such as circuit board industry, plating industry, metal finishing industry, manufacturing industry, coal power stations, municipal or industrial waste incineration industry, battery production and the like.

Description

technical field [0001] The invention relates to the technology of removing, purifying or trapping heavy metal ions in water bodies, in particular to the preparation of a sulfide heavy metal trapping agent and its application method in water treatment. Background technique [0002] Industries often produce wastewater containing chromium, nickel, copper, cadmium, lead, zinc, aluminum, gold, silver, mercury and other metal ions. Concentration and long-term toxic side effects and other characteristics, if not properly handled, will cause serious pollution to the environment. [0003] The traditional pH adjustment precipitation method treats wastewater containing heavy metal ions, that is, by adding alkaline chemicals such as sodium hydroxide, sodium carbonate, and lime, the pH value of the wastewater is adjusted to about 11, and the corresponding heavy metal hydroxide precipitates are formed. Remove heavy metal ions. For the pH adjustment precipitation method, the pH value nee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F1/52C02F101/20
Inventor 王风贺王力友车呈芳
Owner 南京正隆环保工程有限公司
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