CN112374660A - Rare earth wastewater treatment method capable of improving flocculation precipitation speed - Google Patents
Rare earth wastewater treatment method capable of improving flocculation precipitation speed Download PDFInfo
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- CN112374660A CN112374660A CN202011420592.4A CN202011420592A CN112374660A CN 112374660 A CN112374660 A CN 112374660A CN 202011420592 A CN202011420592 A CN 202011420592A CN 112374660 A CN112374660 A CN 112374660A
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- Prior art keywords
- rare earth
- hydroxyquinoline
- anionic polyacrylamide
- improving
- flocculation precipitation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to the field of wastewater treatment, and provides a rare earth wastewater treatment method capable of improving the flocculation precipitation speed, which comprises the following steps: step 1: adjusting the pH value of the wastewater containing rare earth ions to 9.5-10.5; step 2: adjusting the temperature of the solution in the step 1 to be 35-45 ℃; and step 3: adding a composite flocculant consisting of 8-hydroxyquinoline and anionic polyacrylamide into the solution obtained in the step (2), and slightly stirring to disperse the flocculant into the solution, wherein the dosage of the composite flocculant is 3-5 ml/L, and the concentration of the composite flocculant is 4-6 g/L; the weight ratio of the 8-hydroxyquinoline to the anionic polyacrylamide is 0.2: 1-2; and 4, step 4: and (4) standing and settling the solution obtained in the step (3) for 20-40 min. According to the invention, 8-hydroxyquinoline and anionic polyacrylamide are combined, 8-hydroxyquinoline can be coordinated with rare earth ions, and anionic polyacrylamide has a coupling effect and can capture the coordinated 8-hydroxyquinoline rare earth compound, so that the sedimentation of the rare earth ions is accelerated.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a rare earth wastewater treatment method capable of improving the flocculation precipitation speed.
Background
CN201711015642.9 discloses a flocculation recovery method of rare earth modified nano titanium dioxide photocatalyst, which comprises the following steps: adding PAC flocculant with high Al13 content into wastewater treated by TiO2 photocatalyst, continuously stirring, flocculating tiny TiO2 particles into massive flocs by flocculation, settling to realize separation from water, standing, filtering and washing to obtain titanium dioxide powder photocatalyst containing a very small amount of impurities. The recovery method provided by the invention adopts the polyaluminium chloride with high Al13 content as the flocculant, and utilizes the flocculation method to recover and treat the rare earth modified titanium dioxide photocatalyst, so that the advantages of high photocatalyst recovery rate, small flocculant dosage, simple and efficient flow, good secondary photocatalytic activity, no environmental pollution and the like are achieved, the economic, rapid and efficient separation of the titanium dioxide photocatalyst is realized, and further, the method has good application prospect for the nano titanium dioxide photocatalyst in the field of photocatalytic wastewater treatment.
The method adopts the inorganic flocculant for flocculation and precipitation, which causes great inconvenience for the subsequent rare earth recovery.
In the prior art, the method adopts the combination of polyaluminium chloride and polyacrylamide, and the flocculation and precipitation speed of rare earth ions can be improved by an organic and inorganic composite flocculation method.
In view of this, the technical problems to be solved by the present invention are: how to adopt the compound organic flocculant to carry out rapid flocculation precipitation recovery on rare earth ions.
Disclosure of Invention
One of the objectives of the present invention is to provide a method for treating rare earth wastewater, which can increase the flocculation precipitation rate.
In order to achieve the aim, the invention provides a rare earth wastewater treatment method capable of improving the flocculation precipitation speed, which comprises the following steps:
step 1: adjusting the pH value of the wastewater containing rare earth ions to 9.5-10.5;
step 2: adjusting the temperature of the solution in the step 1 to be 35-45 ℃;
and step 3: adding a composite flocculant consisting of 8-hydroxyquinoline and anionic polyacrylamide into the solution obtained in the step (2), and slightly stirring to disperse the flocculant into the solution, wherein the dosage of the composite flocculant is 3-5 ml/L, and the concentration of the composite flocculant is 4-6 g/L; the weight ratio of the 8-hydroxyquinoline to the anionic polyacrylamide is 0.2: 1-2;
and 4, step 4: and (4) standing and settling the solution obtained in the step (3) for 20-40 min.
In the above-mentioned method for treating rare earth wastewater capable of increasing the flocculation precipitation rate, the anionic polyacrylamide is supplied by the first environmental protection technology ltd in capacitive county.
In the above method for treating rare earth wastewater capable of increasing the flocculation precipitation rate, the solution temperature in the step 2 is 40 ℃.
In the method for treating the rare earth wastewater capable of improving the flocculation precipitation speed, the weight ratio of the 8-hydroxyquinoline to the anionic polyacrylamide is 1: 1.4-1.5.
In the above method for treating rare earth wastewater capable of increasing the flocculation precipitation rate, the concentration of rare earth ions in the step 1 is controlled to be less than 10 g/L.
In the above method for treating rare earth wastewater capable of increasing the flocculation precipitation rate, the concentration of rare earth ions in the step 1 is adjusted to 6-8 g/L.
The invention has the beneficial effects that:
according to the invention, 8-hydroxyquinoline and anionic polyacrylamide are combined, 8-hydroxyquinoline can be coordinated with rare earth ions, and anionic polyacrylamide has a coupling effect and can capture the coordinated 8-hydroxyquinoline rare earth compound, so that the sedimentation of the rare earth ions is accelerated.
The settling product of the embodiment is separated, the recovery rate of the rare earth is high, no inorganic metal element is additionally introduced, and the method has great help for the rare earth purification in the later period.
Detailed Description
The invention will now be further described with reference to the following examples, which are not to be construed as limiting the invention in any way, and any limited number of modifications which can be made within the scope of the claims of the invention are still within the scope of the claims of the invention.
In order to explain the technical contents of the present invention in detail, the following description is further made in conjunction with the embodiments.
Example 1
A rare earth wastewater treatment method capable of improving the flocculation precipitation speed comprises the following steps:
step 1: adjusting the pH value of the wastewater containing rare earth ions to 9.5-10.5, wherein the pH regulator is ammonia water; the concentration of rare earth RE in the wastewater is 7g/L, and if the concentration of rare earth is more than the value, the wastewater is recommended to be further diluted so as to achieve the best treatment effect.
Step 2: adjusting the temperature of the solution in the step 1 to be 40 ℃;
and step 3: adding a composite flocculant consisting of 8-hydroxyquinoline and anionic polyacrylamide (supplied by the first believed environmental protection technology Co., Ltd. in the city county) into the solution obtained in the step 2, and slightly stirring to disperse the flocculant into the solution, wherein the dosage of the composite flocculant is 4ml/L of wastewater, and the concentration of the composite flocculant is 5 g/L; the weight ratio of the 8-hydroxyquinoline to the anionic polyacrylamide is 0.2: 1.5;
and 4, step 4: and (3) standing and settling the solution in the step 3 for 20 min.
Example 2
The weight ratio of 8-hydroxyquinoline to anionic polyacrylamide was 0.2:1, substantially as in example 1.
Example 3
The weight ratio of 8-hydroxyquinoline to anionic polyacrylamide was 0.2:2, essentially as in example 1.
Example 4
The concentration of the composite flocculant was adjusted to 4g/L substantially as in example 1.
Example 5
The concentration of the composite flocculant was adjusted to 6g/L substantially as in example 1.
Comparative example 1
The pH was adjusted to 11 in step 1, essentially as in example 1.
Comparative example 2
The flocculant was an anionic polyacrylamide dispersion, substantially as in example 1.
Comparative example 3
Substantially as in example 1, the flocculant was 8-hydroxyquinoline.
Comparative example 4
The wastewater temperature was 60 ℃ substantially as in example 1.
Comparative example 5
The temperature of the waste water was 20 ℃ in substantially the same manner as in example 1.
Rare earth recovery method
And (4) filtering and extruding the flocculate obtained in the step (4), adding the flocculate into 1.5mol/L hydrochloric acid solution, heating to boil, and stirring and dispersing for 2 hours to obtain the rare earth chloride solution.
The concentration of rare earth ions in the supernatant after precipitation in step 4 was determined (where natural sedimentation of the precipitate could not be achieved in comparative example 3, the test was abandoned).
In practical applications, the rare earth RE includes any of the light rare earth, medium rare earth, heavy rare earth, and the like in the art.
The tests show that the pH value of the solution is favorable for rare earth precipitation, but is unfavorable for comprehensive exertion of the effects of 8-hydroxyquinoline and anionic polyacrylamide, and the flocculation temperature has obvious influence on rapid flocculation and sedimentation. The 8-hydroxyquinoline has obvious influence on the flocculation effect of the anionic polyacrylamide.
The examples presented herein are only implementations selected according to a combination of all possible examples. The appended claims should not be limited to the description of the embodiments of the invention. Where numerical ranges are used in the claims, including sub-ranges therein, variations in these ranges are also intended to be covered by the appended claims.
Claims (6)
1. A rare earth wastewater treatment method capable of improving the flocculation precipitation speed is characterized by comprising the following steps:
step 1: adjusting the pH value of the wastewater containing rare earth ions to 9.5-10.5;
step 2: adjusting the temperature of the solution in the step 1 to be 35-45 ℃;
and step 3: adding a composite flocculant consisting of 8-hydroxyquinoline and anionic polyacrylamide into the solution obtained in the step (2), and slightly stirring to disperse the flocculant into the solution, wherein the dosage of the composite flocculant is 3-5 ml/L, and the concentration of the composite flocculant is 4-6 g/L; the weight ratio of the 8-hydroxyquinoline to the anionic polyacrylamide is 0.2: 1-2;
and 4, step 4: and (4) standing and settling the solution obtained in the step (3) for 20-40 min.
2. The method for treating rare earth wastewater capable of improving the flocculation precipitation speed according to claim 1, wherein the anionic polyacrylamide is supplied by first believed environmental science and technology limited in city county.
3. The method for treating rare earth wastewater capable of improving the flocculation precipitation speed according to claim 1, wherein the solution temperature in the step 2 is 40 ℃.
4. The method for treating rare earth wastewater capable of improving the flocculation precipitation speed according to claim 1, wherein the weight ratio of the 8-hydroxyquinoline to the anionic polyacrylamide is 1: 1.4-1.5.
5. The method for treating rare earth wastewater capable of improving the flocculation precipitation speed according to claim 1, wherein the concentration of rare earth ions in the step 1 is controlled below 10 g/L.
6. The method for treating rare earth wastewater capable of improving flocculation precipitation speed according to claim 5, wherein the concentration of rare earth ions in step 1 is adjusted to 6-8 g/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011420592.4A CN112374660A (en) | 2020-12-08 | 2020-12-08 | Rare earth wastewater treatment method capable of improving flocculation precipitation speed |
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| CN202011420592.4A CN112374660A (en) | 2020-12-08 | 2020-12-08 | Rare earth wastewater treatment method capable of improving flocculation precipitation speed |
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| CN112374660A true CN112374660A (en) | 2021-02-19 |
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| CN202011420592.4A Withdrawn CN112374660A (en) | 2020-12-08 | 2020-12-08 | Rare earth wastewater treatment method capable of improving flocculation precipitation speed |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003245674A (en) * | 2002-02-26 | 2003-09-02 | National Institute Of Advanced Industrial & Technology | Treatment method for waste water containing harmful metal ion and fluoride ion, and its treatment agent |
| CN102730812A (en) * | 2012-07-26 | 2012-10-17 | 长沙矿冶研究院有限责任公司 | Pharmaceutical compound for treating wastewater containing complex heavy metals and/or radioactive substances and application of pharmaceutical compound |
| CN104418445A (en) * | 2013-08-22 | 2015-03-18 | 深圳海川环境科技有限公司 | Treatment method of heavy metal sewage |
| CN110204059A (en) * | 2019-07-05 | 2019-09-06 | 深圳利都科技有限公司 | A kind of heat-resisting sewage treatment reagent being unlikely to deteriorate |
-
2020
- 2020-12-08 CN CN202011420592.4A patent/CN112374660A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003245674A (en) * | 2002-02-26 | 2003-09-02 | National Institute Of Advanced Industrial & Technology | Treatment method for waste water containing harmful metal ion and fluoride ion, and its treatment agent |
| CN102730812A (en) * | 2012-07-26 | 2012-10-17 | 长沙矿冶研究院有限责任公司 | Pharmaceutical compound for treating wastewater containing complex heavy metals and/or radioactive substances and application of pharmaceutical compound |
| CN104418445A (en) * | 2013-08-22 | 2015-03-18 | 深圳海川环境科技有限公司 | Treatment method of heavy metal sewage |
| CN110204059A (en) * | 2019-07-05 | 2019-09-06 | 深圳利都科技有限公司 | A kind of heat-resisting sewage treatment reagent being unlikely to deteriorate |
Non-Patent Citations (1)
| Title |
|---|
| 曹宏燕: "《冶金材料分析技术与应用》", 30 September 2008, 冶金工业出版社 * |
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Address after: 341000 office building 9-3, No.31 Changzheng Avenue (Ganzhou chamber of Commerce Building), Zhanggong District, Ganzhou City, Jiangxi Province Applicant after: Jiangxi Jinjin Environmental Protection Technology Co.,Ltd. Address before: 341000 office building 9-3, No.31 Changzheng Avenue (Ganzhou chamber of Commerce Building), Zhanggong District, Ganzhou City, Jiangxi Province Applicant before: JIANGXI TEAMGO ECO-ADVANCE CO.,LTD. |
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Application publication date: 20210219 |