Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for inducing precipitation of sodium chloride crystals in high-salinity waste water

A technology for high-salt wastewater and crystal precipitation, which is applied in the direction of shape preparation of alkali metal chlorides and alkali metal halides, can solve problems such as large pH and temperature restrictions, low purity of precipitated salts, and unsuitable for industrialization, so as to improve benefits, The process is simple and easy to implement, and it is easy to promote the effect of industrialization

Inactive Publication Date: 2019-04-19
ZHONGKAI UNIV OF AGRI & ENG
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The desalination effect of the chemical precipitation method is better, indicating that the amount of wastewater is small and the composition of high-salt wastewater is relatively large, but it has a large limit on pH and temperature, and the desalination cost of high-salt wastewater with complex components is high, and the purity of the precipitated salt is low. Not suitable for industrialization

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for inducing precipitation of sodium chloride crystals in high-salinity waste water
  • Method for inducing precipitation of sodium chloride crystals in high-salinity waste water
  • Method for inducing precipitation of sodium chloride crystals in high-salinity waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] High wastewater from an electroplating factory in Jieyang, containing 13% sodium chloride. This embodiment combines the attached figure 2 The method for treating the optimal pH value of acidification required for the precipitation of sodium chloride crystals in the high-salt wastewater of the electroplating plant is provided, which specifically includes the following steps.

[0038] Measure 50 mL of high-salt wastewater into six 250-mL beakers, adjust the pH value of high-salt wastewater to 2, 3, 4, 5, 6, and 7 with glacial acetic acid for acidification treatment, and at the same time carry out air aeration treatment for 15 minutes .

[0039] According to 0.01% of the quality of high-salt wastewater, 0.05 g of quartz sand was added as a seed crystal for the induced crystallization step to six high-salt wastewater acidified with different pH values. After uniform stirring, evaporate and crystallize at 60°C for 3.5 h.

[0040] Adopt SHB-Ⅲ type suction filtration syste...

Embodiment 2

[0045] High wastewater from an electroplating factory in Jieyang, containing 13% sodium chloride. This embodiment combines the attached image 3 Provided is a method for selecting the best induced seed crystal type and addition amount for the precipitation of sodium chloride crystals in the high-salt wastewater of an electroplating plant, which specifically includes the following steps.

[0046] Measure 50 mL of high-salt wastewater into 33 250-mL beakers, adjust the pH value of high-salt wastewater to 5 with glacial acetic acid for acidification treatment, and perform air aeration treatment for 15 minutes.

[0047] According to 0.005%, 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, and 0.06% of the quality of high-salt wastewater, 33 acidified high-salt wastewater were added with acidified pretreated quartz sand, Four types of seeds, including recrystallized pretreated sodium chloride crystals, untreated quartz sand, and analytically pure sodium chloride crystals, are used as seeds for ...

Embodiment 3

[0053] High wastewater from an electroplating factory in Jieyang, containing 13% sodium chloride. This embodiment combines the attached Figure 4 The method for treating the optimum crystallization temperature required for the precipitation of sodium chloride crystals in the high-salt wastewater of the above electroplating plant is provided, which specifically includes the following steps.

[0054] Measure 50 mL of high-salt wastewater into five 250-mL beakers, adjust the pH value of high-salt wastewater to 5 with glacial acetic acid for acidification treatment, and carry out air aeration treatment for 15 minutes at the same time.

[0055] According to 0.01% of the mass of high-salt wastewater, 0.05 g of quartz sand was added as a seed crystal for the induced crystallization step to five acidified high-salt wastewater. After uniform stirring, evaporate and crystallize at 50°C, 60°C, 70°C, and 80°C for 3.5 h, respectively.

[0056] Adopt SHB-Ⅲ type suction filtration system t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for inducing the precipitation of sodium chloride crystals in high-salinity waste water. According to the method sodium chloride in the high-salinity waste water is recovered through three treatment steps of acidizing aeration, inducing seed crystal adding and evaporative crystallization. The method has the advantages that the sodium chloride in the high-salinity waste water in an electroplating industry can be effectively recovered, the technology is simple, the operation of the technology is easy, industrial popularization is convenient, recovered sodium chloride meets the quality demands of industrial scale products, the method is suitable for industrial salt products in a chlor-alkali industry, the demands of current environmental-protection trend are met, waste zero emission and resource utilization are achieved, and the benefit of a factory is improved.

Description

technical field [0001] The invention relates to a method for treating wastewater, in particular to a method for recycling and treating high-salt wastewater in the electroplating industry, and belongs to the technical field of wastewater treatment. Background technique [0002] As my country's industrialization process continues to accelerate, many production areas will produce high-salt wastewater, but according to different industry products, the salt composition of high-salt wastewater varies greatly. According to statistics, the amount of high-salt wastewater in my country exceeds three million tons every year, and the amount converted into crystalline salt solids exceeds one million tons. The treatment of high-salt wastewater in the electroplating industry is more difficult, which also puts forward higher requirements for the separation of high-salt wastewater in the electroplating industry. [0003] At present, the high-salt wastewater treatment methods used in industr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01D3/24C01D3/06
CPCC01D3/06C01D3/24C01P2006/80
Inventor 丁姣陈文杰尹国强
Owner ZHONGKAI UNIV OF AGRI & ENG