Deep graded salt separation technology

A technology of salt separation and process, applied in separation methods, dispersed particle separation, water/sewage multi-stage treatment, etc., can solve the problems of limited slag discharge methods, difficult to handle, difficult to control equipment impact, etc., to achieve huge market demand and benefits Effect

Active Publication Date: 2017-08-18
JIANGSU HAIRONG THERMAL ANDENVIRONMENTAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This part of the dissolved salt is transferred to the ash or precipitated separately, and new solid waste is generated, which is difficult to handle
In addition, if it is sprayed into the flue, due to the high content of chloride ions, the impact on the equipment is difficult to control, and there is a greater safety risk
4) The multi-stage filtration + reverse osmosis process has been widely used in the domestic power industry, but in the field of desulfurization wastewater, due to the poor quality of desulfurization wastewater, reverse osmosis and pretreatment process costs are very high, and have not been promoted; 5) hydraulic The external discharge process of the slag discharge system, this method is limited by the slag discharge method and is not suitable for all power plants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The deep graded salt process includes the following steps (taking the treatment of 30t / h desulfurization wastewater as an example):

[0031] 1) Extraction of crystalline magnesium hydroxide:

[0032] Conditioning treatment of desulfurization wastewater: In the conditioning tank, add 5000ppm of lime emulsion, 5ppm of PAM, 1ppm of organic sulfur, adjust the PH value to 7, and return the sedimentation slurry to the bottom of the desulfurization tower. The supernatant enters the magnesium removal device;

[0033] After quenching and tempering the flue gas desulfurization wastewater, add crystal magnesium hydroxide seed crystal (dehydrator filtrate reflux) and seed promoter, pass the heater, adjust the water temperature, add sodium hydroxide, and enter the constant temperature reactor at 130 rpm Stir at a high speed, control the pH value of 11 and the reaction time for 120 minutes, enter the sedimentation tank, and overflow the supernatant into the calcium sulfate reaction tank. ...

Embodiment 2

[0041] The deep fractionation salt process specifically includes the following steps:

[0042] 1) Extraction of crystalline magnesium hydroxide:

[0043] Conditioning treatment of desulfurization wastewater: In the conditioning tank, add 5000ppm of lime emulsion, 5ppm of PAM, 1ppm of organic sulfur, adjust the PH value to 7, and return the sedimentation slurry to the bottom of the desulfurization tower. The supernatant enters the magnesium removal device;

[0044] After quenching and tempering the flue gas desulfurization wastewater, add crystal magnesium hydroxide seed crystal (dehydrator filtrate reflux) and seed promoter, pass the heater, adjust the water temperature, add sodium hydroxide, and enter the constant temperature reactor at 130 rpm Stir at a high speed, control the pH value of 11 and the reaction time for 120 minutes, enter the sedimentation tank, and overflow the supernatant into the calcium sulfate reaction tank. The precipitation liquid containing crystal magnesium...

Embodiment 3

[0052] Deep graded salt process, specifically including the following steps (taking the treatment of 30t / h desulfurization wastewater as an example);

[0053] This example is aimed at thermal power plants that use open circulating water systems along the river and coast;

[0054] 1) Extraction of crystalline magnesium hydroxide:

[0055] Conditioning treatment of desulfurization wastewater: In the conditioning tank, add 5000ppm of lime emulsion, 5ppm of PAM, 1ppm of organic sulfur, adjust the PH value to 7, and return the sedimentation slurry to the bottom of the desulfurization tower. The supernatant enters the magnesium removal device,

[0056] After quenching and tempering the flue gas desulfurization wastewater, add crystal magnesium hydroxide seed crystal (dehydrator filtrate reflux) and seed promoter, pass the heater, adjust the water temperature, add sodium hydroxide, and enter the constant temperature reactor at 130 rpm Stir at a high speed, control the pH value of 11 and the...

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PUM

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Abstract

The invention discloses a complete recycle-enhanced separation technology, CREST for short, and belongs to the field of treatment of desulfurization wastewater in thermal power plants and treatment of industrial wastewater in other industries. The technology specifically includes the first step of extraction of crystal magnesium hydroxide, the second step of extraction of calcium sulfate, the third step of enrichment of boron ions and the fourth step of purification of a sodium chloride solution. According to the deep graded salt separation technology, flue gas desulfurization wastewater in thermal power plants is completely recycled for the first time, no new wastewater or solid waste will be generated after treatment with the system, and a real sense of zero emission and recycle can be achieved, so that the technology has extremely huge market demands and benefits.

Description

Technical field [0001] The invention relates to a method for complete resource utilization of flue gas desulfurization wastewater in thermal power plants, in particular to a deep graded salt process. Background technique [0002] The flue gas desulfurization technology produced by thermal power plants widely uses limestone-gypsum wet desulfurization. The waste water produced has high suspended solids content, serious scaling tendency, and complex composition, which becomes the biggest difficulty in the treatment of industrial waste water in power plants. Realizing the harmless discharge and recycling of desulfurization wastewater, that is, the realization of "zero discharge" of desulfurization wastewater has become a very urgent topic. [0003] Because coal contains heavy metals, most of the heavy metals are discharged into the atmosphere from the flue gas through the desulfurization system and through the chimney. A small amount of heavy metals will be discharged with the desulfur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06B01D53/50B01D53/80C01F5/14C01F11/46C01D3/14C02F103/18
Inventor 陈国锋蒋路漫费晓韵仲旭刘洪华刘冬梅黄惟逸胡敏娴
Owner JIANGSU HAIRONG THERMAL ANDENVIRONMENTAL ENG CO LTD
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