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Heavy metal removal preparation and its synthesis method and application

A synthesis method and heavy metal technology, applied in chemical instruments and methods, metallurgical wastewater treatment, flocculation/sedimentation water/sewage treatment, etc., can solve problems such as inability to remove, expensive chelating resin, difficult post-treatment of regeneration solution, etc., and achieve reduction The effect of production cost, high economic value and real benefit

Active Publication Date: 2021-01-26
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is that some cadmium, nickel, and zinc in electroplating wastewater containing cadmium, nickel, and zinc are tightly chelated chelated metal ions, which cannot be removed by conventional precipitation techniques.
In recent years, heavy metal adsorbents made of chelating resins have been used more and more, but chelating resins are very expensive, the adsorption and regeneration steps are cumbersome, and the post-treatment of the regeneration solution is difficult, which is easy to cause secondary pollution

Method used

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  • Heavy metal removal preparation and its synthesis method and application
  • Heavy metal removal preparation and its synthesis method and application
  • Heavy metal removal preparation and its synthesis method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The invention provides a heavy metal removal preparation, the preparation method of which comprises the following steps:

[0047] Add 6.19g of 1,2-dichloroethane, 8.50g of ammonia solution with a concentration of 25-28% (the molar ratio of dichloroethane / ammonia is about 1:2), 28ml of pure water, and seal , 140 ℃ under magnetic stirring for 4h, the highest pressure during the reaction is about 1.1MPa. After the first step reaction is completed and cooled, a small amount of unreacted 1,2-dichloroethane at the bottom is sucked up with a straw. The pH was adjusted to 13.2 with concentrated potassium hydroxide solution, the total volume was 55 ml, distilled under magnetic stirring at 120°C and the distillate was taken up with 15 ml of pure water. After 3 hours of distillation, the final volume of the distillate was 36 ml, and the volume of the residual liquid was 34 ml. Add 1:1 hydrochloric acid to adjust the pH of the distillation residue to 11.0, then add 6.30 g of carb...

Embodiment 2

[0055] In this example, the heavy metal removal preparation prepared in five consecutive rounds in Example 1 is used to remove heavy metals, and the specific scheme is as follows:

[0056] Get actual nickel-containing electroplating wastewater (taken from a certain enterprise in Jiangsu) and copper-containing smelting wastewater (taken from a certain enterprise in Jiangxi) multiple parts respectively, each part of 500ml, as shown in Table 2, add the above-mentioned embodiment five rounds respectively in the above-mentioned sample The heavy metal scavenger with thiocarbamic acid mixed salt as the active ingredient obtained by secondary synthesis, adjust the pH 1-4, stir for 10 minutes to see turbidity, and settle well within 5 minutes, take the clear water, and measure the concentration of raw water and treated water Nickel concentration, calculated removal rate.

[0057] Simultaneously set control 1, do not add the heavy metal removal preparation involved in the present invent...

Embodiment 3

[0062] The invention provides a heavy metal removal preparation, the preparation method of which comprises the following steps:

[0063] In 100ml reactor, add 6.19g 1,2-ethylene dichloride, 8.50g (concentration is the ammoniacal solution of 25-28%, the sodium carbonate solution of 30ml 20% (the mol ratio of dichloroethane / ammonia / sodium carbonate) About 1:2:0.9), sealed, reacted under magnetic stirring at 140°C for 4 hours, the highest pressure during the reaction was about 1.2MPa. After the first step of the reaction was completed and cooled, the suction pipe sucked a small amount of unreacted 1,2- Ethylene dichloride.With concentrated sodium hydroxide solution, pH is adjusted to 13.2, and total volume is 51ml, distills under 120 ℃ of magnetic agitation and receives distillate with 20ml pure water.After distillation 3 hours, distillate final volume is 32ml, The volume of the distillation residue is 39ml. Add 1:1 hydrochloric acid to adjust the pH of the distillation residue t...

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Abstract

The invention relates to the technical field of heavy metal pollution control, and concretely relates to a heavy metal removal preparation, and a synthesis method and an application thereof. The synthesis method of the heavy metal removal preparation includes the following steps: carrying out ammoniation and oligomerization reactions on (CH2)nCl2 (dichloroalkane) and ammonia, which are used as rawmaterials, under an alkaline condition, removing the excess ammonia, and adding carbon disulfide to the reaction system to obtain the product. The ammonia is used as the initial raw material to prepare the heavy metal removal preparation, so the method makes a bold trial, breaks through the routine, completely avoids and eliminates very complicated and difficult separation and purification processes, generates no three wastes are generated in the whole synthesis process, and is green and pollution-free; and the synthesis method realizes the direct preparation of the heavy metal capture agentfrom the dichloroalkane, ammonia and carbon disulfide for the first time, and the outstanding removal effect of the prepared heavy metal capture agent on heavy metals is further confirmed.

Description

technical field [0001] The invention relates to the technical field of heavy metal pollution control, in particular to a heavy metal removal preparation and a synthesis method and application thereof. Background technique [0002] Heavy metal pollution has almost spread all over the world, and heavy metal pollution has been found in many parts of the world. The problem of heavy metal pollution in my country is even more prominent. The bottom of rivers, lakes and reservoirs is seriously polluted, and the rate of heavy metal pollution is extremely high. Various mining, metal smelting, electroplating industry, chemical fertilizer industry, etc. produce a large amount of heavy metal-containing wastewater, which is discharged into the environmental water body, resulting in a sharp increase in the heavy metal content in the environmental water body, causing watershed pollution. Heavy metals that pollute the environment mainly include mercury, cadmium, chromium, lead, nickel, copp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/56C02F1/52C02F101/20C02F103/16
CPCC02F1/52C02F1/56C02F2101/20C02F2103/16
Inventor 郭学军
Owner BEIJING NORMAL UNIVERSITY