Heavy metal precipitant, application, preparation method and acidic wastewater treatment method

A technology for heavy metal precipitation and polluted acid wastewater, which is applied in the fields of flocculation/precipitation water/sewage treatment, water/sludge/sewage treatment, multi-stage water treatment, etc. , copper, nickel ions and acid cannot be recycled and other problems

Active Publication Date: 2021-09-07
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lime neutralization and precipitation method is currently the most commonly used method for treating polluted acid wastewater. The neutralization method has the advantages of less investment and simple operation, but impurities such as metal ions in the polluted acid remain in the neutralized waste residue, which is easy to cause secondary pollution to the environment. Secondary pollution, high-value copper, nickel ions and acid solutions cannot be recycled and reused
The sulfuration method is also commonly used in the treatment of sewage acid wastewater. Heavy metals such as copper and cadmium contained in sewage acid and arsenic can form precipitation with sodium sulfide, but the solubility product of sulfide is relatively close, so it is difficult to effectively separate it, which is also straightforward. It affects the recovery of valuable metals in sewage acid
[0003]The chelation precipitation method is a newly developed technology for recovering high-value copper and nickel ions in sewage acid wastewater. The commonly used precipitants mainly include dimethyl di Sodium thiocarbamate, potassium dimethyldithiocarbamate and sodium diethyldithiocarbamate, although these precipitants can precipitate copper and nickel to a certain extent, but the removal rate is low, especially for Nickel removal rate is less than 5%
In addition, these precipitants often precipitate copper and nickel at the same time, and cannot remove copper and nickel ions with high selectivity, which leads to the inability of secondary use of the precipitate

Method used

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  • Heavy metal precipitant, application, preparation method and acidic wastewater treatment method
  • Heavy metal precipitant, application, preparation method and acidic wastewater treatment method
  • Heavy metal precipitant, application, preparation method and acidic wastewater treatment method

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preparation example Construction

[0032] The preparation method of zinc dimethyl dithiocarbamate is as follows: a complexing agent with a molar ratio of 2:1 and a zinc-containing inorganic salt solution are mixed and reacted, the reaction conditions are 25-30°C, and the reaction time is 2-4h; Wherein, the complexing agent is sodium dimethyl dithiocarbamate or potassium dimethyl dithiocarbamate, and the zinc-containing inorganic salt is zinc sulfate or zinc chloride; the dimethyl dithiocarbamate prepared by the above method Zinc yield is higher.

[0033] Preferably, the reaction condition is 30°C and the time is 2h.

[0034] According to the method for treating polluted acid wastewater of the present invention, a heavy metal precipitant is added to the polluted acid wastewater to carry out the first precipitation, copper ions are reclaimed to obtain waste water for removing copper ions; Ions are recovered. like figure 1 shown, including the following steps:

[0035] Before the treatment, the concentrations ...

Embodiment 1

[0047] The heavy metal precipitant used in this example was prepared by the following method: 0.06mol sodium dimethyldithiocarbamate and 0.03mol zinc sulfate were used as raw materials, mixed uniformly, reacted at 30°C for 3h, filtered, and dried. Grind to obtain 9.05 g of zinc dimethyldithiocarbamate with a yield of 98.20%, which is sealed and stored for future use. figure 2 It is a diffractogram, wherein, the top spectrum is zinc dimethyl dithiocarbamate obtained in the present embodiment, and the corresponding spectrum below is the standard substance of zinc dimethyl dithiocarbamate. By comparison, it can be found that the zinc dimethyl dithiocarbamate spectrum obtained in this example is highly similar to the standard spectrum, indicating that the zinc dimethyldithiocarbamate obtained in this example has a higher purity.

[0048] Adopt processing method of the present invention to process 500mL polluted acid wastewater; Wherein, contain 1.02mol / L H in the polluted acid wa...

Embodiment 2

[0054] The heavy metal precipitant used in this example was prepared by the following method: 0.14 mol sodium dimethyldithiocarbamate and 0.07 mol zinc chloride were used as raw materials, mixed uniformly, reacted at 25 ° C for 2 h, filtered, and dried , and ground to obtain a total of 20.98 g of precipitant ZDMC, with a yield of 98.00%, which was sealed and stored for later use.

[0055] Adopt processing method of the present invention to process 5L dirty acid waste water; Wherein, contain 1.53mol / LH in the dirty acid waste water 2 SO 4 , 500mg / L Cu ions and 100mg / L Ni ions.

[0056] In the present embodiment, the addition amount of zinc dimethyl dithiocarbamate twice is 12.03g and 5.21g respectively.

[0057] The stirring conditions for the two times in this embodiment are both stirring at a frequency of 200 r / min at 30° C., and the stirring time is 180 min.

[0058] In this embodiment, after the first precipitation, the concentrations of Cu ions and Ni ions in the filtra...

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Abstract

The invention relates to a heavy metal precipitant, application, a preparation method and an acidic wastewater treatment method. The heavy metal precipitant is zinc dimethyldithiocarbamate, and the treatment method comprises the following steps: adding the heavy metal precipitant into the waste acid wastewater for primary precipitation, and recovering copper ions to obtain wastewater without the copper ions; and then adding the heavy metal precipitant to carry out secondary precipitation, and recovering nickel ions. The heavy metal precipitant disclosed by the invention is used for precipitating and removing copper ions and nickel ions in acidic wastewater, and the removal rate is greater than 99%; and according to the treatment method, copper and nickel ions in the waste acid can be recycled in a high-selectivity grading mode, the method has the advantages of being convenient, efficient and environmentally friendly, waste acid wastewater treatment in the traditional sense can be achieved, and products can be recycled.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular, to a heavy metal precipitant, application, preparation method and sewage acid wastewater treatment method. Background technique [0002] Sewage acid wastewater mainly comes from sulfuric acid industry, non-ferrous metal smelting and other industries, containing high concentration of sulfuric acid (5%-20%) and copper, nickel, cadmium, zinc plasma (50-500mg / L). Lime neutralization precipitation method is currently the most commonly used method to treat polluted acid wastewater. The neutralization method has the advantages of less investment and simple operation, but impurities such as metal ions in the polluted acid remain in the neutralized waste residue, which is easy to cause secondary pollution to the environment. Secondary pollution, high-value copper, nickel ions and acid solutions cannot be reused as resources. The sulfuration method is also commonly u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/54C01G3/02C01G53/04C02F101/10C02F101/20
CPCC02F1/54C01G3/02C01G53/04C02F2101/101C02F2101/20C02F2301/08Y02P10/20
Inventor 彭先佳杨欣胡星云孔令昊
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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