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Method and system for recovering chlorine salt from acid washing wastewater through crystallization

A technology for acid washing and waste water, which is applied in the field of waste water crystallization and recovery of chloride salt, acid washing waste water crystallization and recovery of chloride salt, acid washing waste water crystallization and recovery of chloride salt system, to achieve the effect of clean recovery or treatment and prevention of clogging

Pending Publication Date: 2021-12-07
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the crystalline salt that this method reclaims is miscellaneous salt, needs further treatment

Method used

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  • Method and system for recovering chlorine salt from acid washing wastewater through crystallization
  • Method and system for recovering chlorine salt from acid washing wastewater through crystallization
  • Method and system for recovering chlorine salt from acid washing wastewater through crystallization

Examples

Experimental program
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Effect test

Embodiment approach

[0057] According to a first embodiment of the present invention, there is provided a method of acid washing wastewater chloride crystal recovery:

[0058] Recovering an acid chloride crystals washing wastewater, the method comprising: 1) an acidic pretreatment of waste water of flue gas washing wastewater, wastewater impurity to give a clear solution; 2) a preliminary separation of metal elements: the supernatant of the waste water for iron impurity MICROELECTROLYSIS to give wastewater to be oxidized; 3) separating a metal element depth: oxide to treat wastewater oxidation treatment, waste water again after the oxidation treatment was adjusted by adding an alkali agent is a weak base wastewater, and solid adsorbents, to give ammonia-containing waste water and metal sludge; 4) removal of ammonia: ammonia-containing wastewater Xianxiang alkali agent added was adjusted alkali wastewater, wastewater containing ammonia and then basified deamination into physical device 6 in addition to...

Embodiment 1

[0082] A method of crystallization of acidic washing waste water crystalline recovery chloride, the method comprising: 1) for wastewater pretreatment to the acid flue gas washing waste, resulting in a hetero-waste liquid; 2) Preliminary separation of metal elements: iron in addition to severe waste liquid Carbon microelectrolysis treatment to obtain wastewater to be oxidant; 3) Depth separation of metal elements: First, oxidize wastewater is oxidized, and then add an alkali to waste water to adjust the weak alkali wastewater, and add solid adsorbent to obtain an ammonia wastewater; In the ammonia: first, the ammonia is added to the ammonia-containing wastewater, and the ammonia wastewater is introduced into the physical deammine device 6 to obtain high salt wastewater; 5) Evaporation crystals: MVR for high salt wastewater The crystallization treatment was evaporated to obtain solid chloride, and the remaining butter salt parental fluid was obtained.

Embodiment 2

[0084] Example 1 is repeated in step 2), the iron / microelectric solution to which the hetero-waste liquid is carried out is specifically comprised of the following steps: 2a) by adding the acid solution to 3.5; 2b) Carbon microelectrolysis treatment was carried out in addition to a hetero-waste liquid liquid by iron microelectric device 2.

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Abstract

The invention relates to a method and a system for recovering chlorine salt from acid washing wastewater through crystallization, and the method comprises the following steps: 1) carrying out wastewater pretreatment on acid flue gas washing wastewater to obtain an impurity-removed wastewater clear liquid; 2) carrying out iron-carbon micro-electrolysis treatment on the impurity-removed wastewater clear liquid to obtain to-be-oxidized wastewater; 3) performing oxidation treatment on the to-be-oxidized wastewater adding an alkaline agent into the wastewater subjected to oxidation treatment to adjust the wastewater into weak base wastewater, and adding a solid adsorbent to obtain ammonia-containing wastewater and metal sludge; 4) firstly adding an alkaline agent into the ammonia-containing wastewater to adjust the ammonia-containing wastewater into strong-alkali wastewater, and then introducing the strong-alkali wastewater into a physical deamination device for deamination treatment to obtain an ammonia-containing product and high-salinity wastewater; and 5) carrying out MVR evaporative crystallization treatment on the high-salinity wastewater to obtain solid chlorine salt and carnallite mother liquor. According to the technical scheme provided by the invention, the acid-making wastewater process is optimized through a combined method of iron-carbon micro-electrolysis, oxidation, weak base adsorption and crystallization, so that clean and deep removal of ammonia nitrogen is realized, the use of an alkaline agent is reduced, the production cost is reduced, and high-concentration chlorine salt is recovered.

Description

Technical field [0001] The present invention relates to a waste water crystallization process for recovering chloride salts, in particular, to an acid chloride method of washing wastewater crystal recovery, sintering gas belongs Technical Field; The present invention further relates to a crystalline acid washing waste water recovery system of a chloride salt. Background technique [0002] Sulfur dioxide is one of the major air pollutants in emissions by nearly 20 million tons, resulting in a serious waste of resources and sulfur acid rain, smog and other air pollution. With national environmental laws and regulations and standards becoming more stringent, and recycling to reduce emissions of sulfur dioxide has become a major issue in urgent need of a breakthrough in the field of environmental protection. Sulfuric acid is an important chemical raw material, widely used in industrial production, while the relative shortage of resources, sulfur, sulfuric acid long-term demand. After...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/18C02F101/30C02F101/20C02F101/16C02F101/14C02F101/12
CPCC02F9/00C02F1/001C02F1/46176C02F1/72C02F1/66C02F1/28C02F1/20C02F1/041C02F1/16C02F2103/18C02F2101/30C02F2101/20C02F2101/16C02F2101/14C02F2101/12C02F2301/08
Inventor 杨本涛廖继勇李佳崔泽星肖海娟肖祈春
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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