Title:
COOPERATIVE TREATMENT METHOD AND TREATMENT SYSTEM FOR HIGH-SALT SOLID WASTE ASH AND ACIDIC WASTEWATER OF STEEL PLANT
Document Type and Number:
WIPO Patent Application WO/2023/036053
Kind Code:
A1
Abstract:
Disclosed are a cooperative treatment method and a treatment system for high-salt solid waste ash and acidic wastewater of a steel plant. High-purity potassium chloride is generated by means of the high-salt solid waste ash produced by steel enterprises. Meanwhile, on the basis of the characteristics of the high content of heavy metals such as thallium, the high ammonia-nitrogen concentration and the high sulfate concentration in the conventional high-salt solid waste ash washing wastewater, and in combination with the characteristics that the wastewater of the steel plant contains a large amount of sulfite ions (flue gas washing wastewater) or iron ions (cold rolling rinsing wastewater) and has a low acidity, the purposes of cooperative treatment and recycling of the high-salt solid waste ash and acidic wastewater of the steel plant are achieved based on the existing high-salt solid waste ash washing and wastewater recycling processes by means of the synergistic effects of the acidic wastewater sectional supply for ash washing, sulfur and ammonia-nitrogen removal, the advanced oxidation of thallium, COD and ammonia-nitrogen by iron-carbon micro-electrolysis, and countercurrent evaporation for potassium and sodium separation, thereby greatly improving the quality of the recycled potassium and sodium salts. In addition, the technical solution provided by the present invention further has the advantages of simple process conditions, low energy consumption, no wastewater discharge, etc.
Inventors:
YE HENGDI (CN)
YAN XU (CN)
YANG BENTAO (CN)
WEI JINCHAO (CN)
CHAI LIYUAN (CN)
LIU YANTING (CN)
FENG ZHEYU (CN)
YAN XU (CN)
YANG BENTAO (CN)
WEI JINCHAO (CN)
CHAI LIYUAN (CN)
LIU YANTING (CN)
FENG ZHEYU (CN)
Application Number:
PCT/CN2022/116649
Publication Date:
March 16, 2023
Filing Date:
September 02, 2022
Export Citation:
Assignee:
ZHONGYE CHANGTIAN INT ENG CO (CN)
UNIV CENTRAL SOUTH (CN)
UNIV CENTRAL SOUTH (CN)
International Classes:
B09B3/00; C02F101/16; C02F101/20; C02F103/18
Domestic Patent References:
| WO2018029290A1 | 2018-02-15 |
Foreign References:
| CN114702188A | 2022-07-05 | |||
| CN213294972U | 2021-05-28 | |||
| CN105540946A | 2016-05-04 | |||
| CN213288099U | 2021-05-28 | |||
| CN105036413A | 2015-11-11 | |||
| CN112321048A | 2021-02-05 |
Attorney, Agent or Firm:
BEIJING TROHENG INTELLECTUAL PROPERTY LAW FIRM (CN)
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