Title:
METHOD FOR PURIFYING AND WHITENING PHOSPHOGYPSUM
Document Type and Number:
WIPO Patent Application WO/2024/040893
Kind Code:
A1
Abstract:
The present application relates to the technical field of comprehensive utilization of solid waste. Disclosed is a method for purifying and whitening phosphogypsum. The method for purifying and whitening phosphogypsum comprises the following steps: (1) adding water into phosphogypsum to prepare pulp, and decolorizing the pulp to obtain decolorized pulp; (2) adding a collector agent into the decolorized pulp, adding a pH regulator to adjust the pH to 2.0-2.5, and carrying out first direct flotation to obtain a first flotation liquor; (3) adding the pH regulator into the first flotation liquor to adjust the pH to 2.0-2.5, and carrying out second direct flotation to obtain a second flotation liquor; and (4) adding the pH regulator into the second flotation liquor to adjust the pH to 2.0-2.5, carrying out third direct flotation, concentrating, filtering, and drying to obtain refined phosphogypsum. Phosphogypsum having high purity and high whiteness can be prepared, thereby effectively reducing stockpiling of phosphogypsum and alleviating environmental pressure.
Inventors:
XIAO CONG (CN)
LU RUI (CN)
WANG ZHIFU (CN)
WANG HAO (CN)
TANG SHENGHE (CN)
LI CHANGDONG (CN)
LU RUI (CN)
WANG ZHIFU (CN)
WANG HAO (CN)
TANG SHENGHE (CN)
LI CHANGDONG (CN)
Application Number:
PCT/CN2023/077582
Publication Date:
February 29, 2024
Filing Date:
February 22, 2023
Export Citation:
Assignee:
GUANGDONG BRUNP RECYCLING TECHNOLOGY CO LTD (CN)
HUNAN BRUNP RECYCLING TECH CO LTD (CN)
HUNAN BRUNP RECYCLING TECH CO LTD (CN)
International Classes:
B03D1/02; B03B1/04
Foreign References:
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| CN111302377A | 2020-06-19 | |||
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| CN103212484A | 2013-07-24 | |||
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| CN108816521A | 2018-11-16 | |||
| CN109290061A | 2019-02-01 | |||
| CN110142145A | 2019-08-20 | |||
| CN110612161A | 2019-12-24 | |||
| CN114308398A | 2022-04-12 |
Attorney, Agent or Firm:
BEIJING YZH IP FIRM (CN)
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