CN112573847A - Method for removing organic matters in gypsum - Google Patents
Method for removing organic matters in gypsum Download PDFInfo
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- CN112573847A CN112573847A CN202110073065.9A CN202110073065A CN112573847A CN 112573847 A CN112573847 A CN 112573847A CN 202110073065 A CN202110073065 A CN 202110073065A CN 112573847 A CN112573847 A CN 112573847A
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- phosphogypsum
- organic matters
- removing organic
- liquid mixture
- hydrogen peroxide
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
- C04B11/266—Chemical gypsum
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention discloses a method for removing organic matters in phosphorus gypsum, which comprises the following steps: (1) adding washing water into the phosphogypsum, standing for layering after uniformly stirring, and scraping a black organic matter layer floating on the water surface; (2) adjusting the pH value of the phosphogypsum solid-liquid mixture to 3-5, adding ferrous sulfate and hydrogen peroxide, and reacting for 1-2 hours under the stirring condition; (3) and (4) carrying out suction filtration on the phosphogypsum solid-liquid mixture to obtain the phosphogypsum with organic matters removed. The method of the invention has the advantages of simplicity, short reaction time, obvious effect and low cost.
Description
Technical Field
The invention relates to the field of impurity removal of phosphogypsum, in particular to a method for removing organic matters in the phosphogypsum.
Background
The organic matters in the phosphogypsum are mainly carried by phosphate ores and flocculating agents added during the production of phosphoric acid, and the main components of the organic matters are ethylene glycol monomethyl ether acetate, isothiocyanic methane, 3-methoxy-n-pentane, 2-ethyl-13-dioxolane and the like. The organic matter increases the standard consistency of the phosphogypsum, prolongs the setting time, reduces the strength and prevents the application of the phosphogypsum in the building material aspect.
At present, the organic matters in the dephosphorization gypsum are mainly subjected to a water washing method, a flotation method and a calcination method. The water washing method can remove most impurities and organic matters, but the sewage generated by washing must be treated for discharge or utilization. The flotation method is that water and phosphogypsum are put into flotation equipment according to a certain proportion, and organic matters floating on the water surface are separated and removed after stirring and standing. The calcining method needs to eliminate the influence of organic matters at a high temperature of 800 ℃, has high requirements on equipment, and the product is anhydrous calcium sulfate.
The flotation method can effectively remove the organic matters in the phosphogypsum only by adding a medicament, the flotation medicament is generally expensive, only a part of the organic matters can be removed without adding the medicament, and the production requirement of high-strength gypsum cannot be met.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for removing organic matters in gypsum by adopting a flotation method and a Fenton method, wherein the flotation method is used for removing the organic matters in the gypsum, and does not add a medicament and only uses a small amount of water for flotation; the Fenton method refers to Fe under acidic condition2+Catalysis H2O2The oxidative hydroxyl free radicals are generated, and a method for rapidly and nonselectively oxidizing a plurality of known organic compounds such as carboxylic acid, alcohol and ester into an inorganic state can be realized.
The technical scheme of the invention is as follows: a method for removing organic matters in phosphogypsum comprises the following steps:
(1) adding washing water into the phosphogypsum, standing for layering after uniformly stirring, and scraping a black organic matter layer floating on the water surface.
(2) Adjusting the pH value of the phosphogypsum solid-liquid mixture to 3-5, adding ferrous sulfate and hydrogen peroxide, and reacting for 1-2 hours under the stirring condition.
(3) And (4) carrying out suction filtration on the phosphogypsum solid-liquid mixture to obtain the phosphogypsum with organic matters removed.
In the step (1), the mass ratio of the washing water to the phosphogypsum is 1: 1.
In the step (2), the pH value of the phosphogypsum solid-liquid mixture is 3.5.
In the step (2), the hydrogen peroxide and the ferrous sulfate are in industrial grade, and the purity is 80%.
In the step (2), the adding amount of hydrogen peroxide is 1.5 times of the mass of the organic matters in the phosphogypsum after the flotation treatment.
In the step (2), the adding amount of the ferrous sulfate is 0.5 time of the mass of the hydrogen peroxide.
In the step (2), the reaction time was 1 hour.
In the step (3), the suction filtration pressure is 0.08 MPa.
The invention has the beneficial effects that: after the treatment by the technical scheme, the removal rate of the phosphogypsum organic matter is more than 95%. The pH value of the phosphogypsum is 3.5 after the phosphogypsum is mixed with water, and the pH value needs to be adjusted without adding a medicament. The invention has low requirement on equipment, simple process, low cost and obvious effect.
Detailed Description
Example 1
Weighing 500g of phosphogypsum in a 2000ml beaker, sampling and analyzing 0.102% of organic matters in the phosphogypsum, adding 500g of washing water, stirring uniformly, standing for 5 minutes for layering, and scraping off a black organic matter layer floating on the water surface. And measuring the pH value of the phosphogypsum solid-liquid mixture to be 3.5, adding 0.23g of ferrous sulfate and 0.45g of hydrogen peroxide, and stirring for reacting for 1 hour. And (3) carrying out suction filtration on the solid-liquid mixture after the reaction under the vacuum degree of 0.08MPa to obtain the phosphogypsum with organic matters removed, and analyzing the content of the organic matters in the phosphogypsum to be 0.005%.
Example 2
Weighing 500g of phosphogypsum in a 2000ml beaker, sampling and analyzing 0.115% of organic matters in the phosphogypsum, adding 500g of washing water, stirring uniformly, standing for 5 minutes for layering, and scraping off a black organic matter layer floating on the water surface. And measuring the pH value of the phosphogypsum solid-liquid mixture to be 3.3, adding 0.24g of ferrous sulfate and 0.48g of hydrogen peroxide, and stirring for reacting for 2 hours. And (3) carrying out suction filtration on the solid-liquid mixture after the reaction under the vacuum degree of 0.08MPa to obtain the phosphogypsum with organic matters removed, and analyzing the content of the organic matters in the phosphogypsum to be 0.007%.
Claims (8)
1. A method for removing organic matters in phosphogypsum is characterized by comprising the following steps:
(1) adding washing water into the phosphogypsum, standing for layering after uniformly stirring, and scraping a black organic matter layer floating on the water surface;
(2) adjusting the pH value of the phosphogypsum solid-liquid mixture to 3-5, adding ferrous sulfate and hydrogen peroxide, and reacting for 1-2 hours under the stirring condition;
(3) and (4) carrying out suction filtration on the phosphogypsum solid-liquid mixture to obtain the phosphogypsum with organic matters removed.
2. The method for removing organic matters in phosphorus gypsum according to claim 1, wherein in the step (1), the mass ratio of the washing water to the phosphogypsum is 1: 1.
3. The method for removing organic matters in phosphorus gypsum according to claim 1, wherein in step (2), the pH value of the phosphogypsum solid-liquid mixture is 3.5.
4. The method for removing organic matters in phosphorus gypsum according to claim 1, wherein in the step (2), the hydrogen peroxide and the ferrous sulfate are of industrial grade, and the purity of each is 80%.
5. The method for removing organic matters in phosphogypsum according to claim 1, wherein in the step (2), the adding amount of hydrogen peroxide is 1.5 times of the mass of the organic matters in the phosphogypsum after flotation treatment.
6. The method for removing organic matters in phosphorus gypsum according to claim 1, wherein in the step (2), the addition amount of the ferrous sulfate is 0.5 times of the mass of the hydrogen peroxide.
7. The method for removing organic matters in gypsum according to claim 1, wherein the reaction time in step (2) is 1 hour.
8. The method for removing organic matters in gypsum according to claim 1, wherein in the step (3), the suction filtration pressure is 0.08 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110073065.9A CN112573847A (en) | 2021-01-20 | 2021-01-20 | Method for removing organic matters in gypsum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110073065.9A CN112573847A (en) | 2021-01-20 | 2021-01-20 | Method for removing organic matters in gypsum |
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| Publication Number | Publication Date |
|---|---|
| CN112573847A true CN112573847A (en) | 2021-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110073065.9A Pending CN112573847A (en) | 2021-01-20 | 2021-01-20 | Method for removing organic matters in gypsum |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113135585A (en) * | 2021-04-22 | 2021-07-20 | 深圳市青青源科技有限公司 | Preparation method for reducing organic matter content in desulfurized gypsum |
| CN115893885A (en) * | 2022-12-02 | 2023-04-04 | 湖北省生态环保有限公司 | Phosphogypsum immersion cleaning agent and phosphogypsum harmless treatment method |
| CN116573661A (en) * | 2023-06-08 | 2023-08-11 | 西南科技大学 | Method for removing organic matters from phosphogypsum |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113135585A (en) * | 2021-04-22 | 2021-07-20 | 深圳市青青源科技有限公司 | Preparation method for reducing organic matter content in desulfurized gypsum |
| CN115893885A (en) * | 2022-12-02 | 2023-04-04 | 湖北省生态环保有限公司 | Phosphogypsum immersion cleaning agent and phosphogypsum harmless treatment method |
| CN116573661A (en) * | 2023-06-08 | 2023-08-11 | 西南科技大学 | Method for removing organic matters from phosphogypsum |
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Application publication date: 20210330 |