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Technology for extracting copper from copper ammonia wastewater through ion exchange method

A technology of ion exchange method and cuproammonia wastewater, which is applied in the direction of ion exchange water/sewage treatment, copper nitrate, chemical instruments and methods, etc., can solve the problems of difficult discharge of wastewater, secondary pollution of extractant, high operating cost, etc. Achieve the effect of reducing steam consumption, low operating cost and high purity

Inactive Publication Date: 2012-05-09
JIANGDU HAIYANG CHEM
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Problems solved by technology

When using the extraction method to absorb copper ions, but this method is difficult to achieve the discharge of wastewater up to the standard and will cause secondary pollution to the treatment of the extractant; the use of traditional organic skeleton ion exchangers to absorb copper ions in wastewater, due to the impact of ion exchanger varieties And performance limitations, higher operating costs

Method used

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  • Technology for extracting copper from copper ammonia wastewater through ion exchange method
  • Technology for extracting copper from copper ammonia wastewater through ion exchange method
  • Technology for extracting copper from copper ammonia wastewater through ion exchange method

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Embodiment 1

[0028] See Table 1 for the water quality of cuproammonia wastewater from the fine chemical factory of Jilin Chemical Company.

[0029] Table 1 The content of pollutants in cuproammonia wastewater mg / L

[0030] Wastewater type

Water volume (m 3 / d)

pH

Cu 2+

NH 3

NO 3 -

Cupro ammonia wastewater

6

9-10

5000

5000

5000

[0031] Process 6m with 3 After cuproammonia wastewater, Cu 2+ Less than 0.5mg / L, the pH value of wastewater is 6-9. The ammonia in the waste water can be removed by negative pressure sub-boiling ammonia distillation according to the needs, or it can be directly brought into the company's main pipe for treatment. This plan is directly brought into the Jihua Company's main pipe for treatment. If calculated on the basis of 300 days per year, 27.0 tons of pure copper nitrate or 34.8 tons of copper nitrate trihydrate crystals can be recovered.

[0032] Workflow description:

[0033] ...

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Abstract

The invention discloses a technology for extracting copper from copper ammonia wastewater through an ion exchange method. The technology comprises the following steps: firstly regulating the pH value of the wastewater to 2-3 to enable copper in the wastewater to exist in form of ions, simultaneously settling silicon ions and ferric ions in the wastewater, using a copper resin column to adsorb copper ions in the wastewater after impurities in the wastewater are removed, using nitric acid with weight in weight (w / w) of 8-15 percent for regeneration, and centrifugally separating the regenerated concentrated solution to obtain copper nitrate trihydrate. The technology for extracting copper from copper ammonia wastewater through the ion exchange method can be used for directly extracting copper ions from the wastewater. Since the system adopts online detection and automatic control, the wastewater emission is effectively ensured to satisfy the standard. The content of copper in the wastewater treated by using the technology of the invention is less than 0.5mg / l, the metal recovery rate can reach 99.5 percent and the purity of the recovered copper can reach 99 percent. Compared with a traditional ion exchange system, the invention has the advantages that the operation of the technology is simple, the operation cost is low, the high-purity copper nitrate can be obtained and the steam consumption is decreased by more than one time.

Description

technical field [0001] The invention belongs to the technical field of chemical industry. The invention relates to a process for extracting copper from cuproammonia wastewater by using an ion exchange method. Background technique [0002] A large amount of cuproammonia waste water will be produced during the production of copper nitrate catalyst. Wastewater mainly contains about 5g / L copper and about 5g / L ammonia. [0003] At present, there are many methods for extracting copper from cuproammonia wastewater, and the commonly used methods are: extraction method and ion exchange method. When using the extraction method to absorb copper ions, but this method is difficult to achieve the discharge of wastewater up to the standard and will cause secondary pollution to the treatment of the extractant; the use of traditional organic skeleton ion exchangers to absorb copper ions in wastewater, due to the impact of ion exchanger varieties And performance limitations, higher operati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C01G3/08C02F1/66C02F1/42
Inventor 沈健殷冠凤房华唐小英
Owner JIANGDU HAIYANG CHEM
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