Technology and device for recycling sodium chloride from wastewater generated in process of producing silica sol by ion exchange method
An ion exchange method and silica sol technology, applied in the field of sodium chloride recovery process and equipment, can solve the problems of sodium chloride recovery and low salt concentration, reduce operating costs, reduce environmental pollution, simple structure and process Effect
Inactive Publication Date: 2015-01-28
绍兴上虞佳和化工有限公司
View PDF8 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0007] Due to the low salt concentration in the waste water produced by resin regeneration during the separation method, the above methods cannot effectively recover the sodium chloride in the waste water
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0036] Such as figure 1 Shown is a schematic structural diagram of the device of the present invention, including a first-stage concentration crystallization device, a second-stage concentration crystallization device and a third-stage concentration crystallization device.
[0037] The primary concentration and crystallization device includes a sodium chloride solution storage tank 8, a preheating heat exchanger 29, a first circulation pump 6, a first heat exchanger 3, a first evaporation chamber 2, a first crystallization separation chamber 4, a first steam A compressor 1 and a first condensed water storage tank 7;
[0038]Wherein the outlet of the first sodium chloride solution storage tank 8 is connected to the tube side inlet of the preheating heat exchanger 29 by the preheating circulation pump, and the tube side outlet of the preheating heat exchanger 29 is connected to the inlet of the first circulation pump 6, preheating The shell side inlet of the heat exchanger 29 i...
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
Login to View More Abstract
The invention discloses a technology and device for recycling sodium chloride from wastewater generated in a process of producing silica sol by an ion exchange method. The device comprises a first-stage concentration and crystallization device, a second-stage concentration and crystallization device and a third-stage concentration and crystallization device. The method comprises the following steps of: preheating a sodium chloride solution, carrying out first-stage heating, then carrying out first-stage evaporation, concentration and crystallization to respectively obtain primary steam and first-stage concentrated liquid, cooling and devitrifying, and separating out crystal substances to obtain first-stage separating liquid; carrying out second-stage heating on the first-stage separating liquid, then carrying out second-stage evaporation, concentration and crystallization to respectively obtain secondary steam and second-stage concentrated liquid, cooling and devitrifying, and separating out the crystal substances to obtain second-stage separating liquid; carrying out third-stage heating on the second-stage separating liquid, then carrying out third-stage evaporation, concentration and crystallization to respectively obtain third steam and third-stage concentrated liquid, cooling and devitrifying, and separating out the crystal substances to obtain third-stage separating liquid; and collecting the crystal substances obtained in the steps from (1) to (3), and drying the crystal substances to obtain recycled sodium chloride. The method and device are used for recycling sodium chloride from wastewater generated in the process of producing the silica sol by the ion exchange method.
Description
technical field [0001] The invention relates to the recovery of manganese chloride in industrial waste water, in particular to a process and a device for recovering sodium chloride from waste water produced by ion exchange to produce silica sol based on three-stage concentration. Background technique [0002] There are different ways to prepare silica sol, the most commonly used methods are ion exchange, one-step hydrolysis of silica powder, electrodialysis and so on. The ion exchange process of silica sol was developed by the NALCO company of the United States in the 1940s, and then perfected by the DuPont company of the United States in the 1950s and 1960s. It is currently the most mature and widely used process. [0003] For example, the Chinese invention application with the publication number CN102583406A discloses a method for purifying high-purity silica sol by ion exchange, mixing the regenerated strong-acid cation-exchange resin and strong-base anion-exchange resin ...
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
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10
Inventor 陈兴祥
Owner 绍兴上虞佳和化工有限公司