CN105129757A - Method for preparing battery grade iron phosphate through chemical nickel-plating waste liquid - Google Patents
Method for preparing battery grade iron phosphate through chemical nickel-plating waste liquid Download PDFInfo
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- CN105129757A CN105129757A CN201510536569.4A CN201510536569A CN105129757A CN 105129757 A CN105129757 A CN 105129757A CN 201510536569 A CN201510536569 A CN 201510536569A CN 105129757 A CN105129757 A CN 105129757A
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- iron phosphate
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Abstract
The invention provides a method for preparing battery grade iron phosphate through chemical nickel-plating waste liquid. The method includes the following steps that hypophosphite radical ions and phosphorous acid radical ions are oxidized into orthophosphoric acid radical ions, the nickel-plating waste liquid is continuously added into h2o2 with the concentration being 300 mm-600mm under irradiation of ultraviolet ray, and reaction lasts for 60-180 min. According to the method, while organic matter in the nickel-plating waste liquid is effectively decomposed and nickel ions are recycled through a special oxidization, precipitation, conversion and separation technology, the hypophosphite radical ions and the phosphorous acid radical ions in the nickel-plating waste liquid are converted into the orthophosphoric acid radical ions, and furthermore, iron ions are added and converted into iron phosphate precipitate to be recycled. The method also creatively utilizes the special technology so that the grain size of the prepared iron phosphate can be controlled within 50 nm, the prepared iron phosphate belongs to the battery grade iron phosphate, and therefore the method has good environmental protection benefits and economic benefits.
Description
Technical field
The present invention relates to wastewater treatment and the resource reutilization technical field of environmental protection, be specially a kind of method utilizing chemical nickel plating waste solution to prepare battery-grade iron phosphate.
Background technology
Chemical nickel plating is current Application comparison process of surface treatment widely, can scrap, become chemical nickel plating waste solution after chemical nickel-plating solution uses for some time.Containing nickel ion, hypophosphite ion and a large amount of orthophosphite ions in waste liquid, also containing a large amount of organism, direct discharge can cause serious environmental pollution, also can cause the wasting of resources simultaneously, and traditional treatment process is difficult to the requirement meeting production and environmental protection.
Summary of the invention
Technical problem solved by the invention is to provide a kind of method utilizing chemical nickel plating waste solution to prepare battery-grade iron phosphate, Hypophosporous Acid, 50 root in nickel-plating waste liquid, orthophosphite ions are converted into positive phosphorus acid ion and add iron ion further and be converted into the recycling of tertiary iron phosphate precipitation, to solve the problem in above-mentioned background technology.
Technical problem solved by the invention realizes by the following technical solutions: a kind of method utilizing chemical nickel plating waste solution to prepare battery-grade iron phosphate, comprises the following steps:
Step 1, chemical nickel plating waste solution concentrated be discharged into equalizing tank and carry out preliminary filtration, the small-particle impurity in removing waste water;
Step 2, utilize ion-exchange, nickel ion reclaims by the method for electrophoresis and displacement;
Step 3, the Hypophosporous Acid, 50 root in chemical nickel plating waste solution and orthophosphite ions are oxidized to positive phosphorus acid ion, under ultraviolet light irradiation, add to nickel-plating waste liquid the H that concentration is 300mM ~ 600mM continuously
2o
2, reaction 60 ~ 180min;
Step 4, add ferric sulfate phosphate anion is precipitated, obtain raw phosphoric acid iron precipitation, tertiary iron phosphate precipitation is separated by physical separation method with waste liquid, obtains elementary tertiary iron phosphate throw out;
Step 5, by after deionized water rinsing, tertiary iron phosphate precipitation is separated by physical separation method with clear liquid, repeatedly rinses separation ten times to 20 times, obtain elementary tertiary iron phosphate product;
Step 6, add phosphoric acid adjusted to ph, elementary tertiary iron phosphate product is dissolved;
Step 7, phosphoric acid-tertiary iron phosphate mixed solution is heated to 65 ~ 75 DEG C, adds sodium hydroxide readjustment pH value, continue slowly to add sodium hydroxide in 2h, add nanoscale iron phosphate in process and precipitate successively;
Step 8, by tertiary iron phosphate precipitation be separated by physical separation method with waste liquid, obtain elementary tertiary iron phosphate throw out;
Step 9, by after deionized water rinsing, tertiary iron phosphate precipitation be separated by physical separation method with clear liquid, repeatedly rinse separation ten times to 20 times, then drying treatment obtains nanoscale iron phosphate product.
Preferably, the nickel-plating waste liquid described in step 1 is used chemical nickel plating tank liquor, and it contains one or more in organism, hypophosphite ion, orthophosphite ions, nickel ion.
Preferably, the filter method described in step 1 comprises the combination of tubular type micro-filtration, ultrafiltration.
Preferably, the nickel-plating waste liquid pH value described in step 3 is between 3-4, described ultraviolet light intensity 1 ~ 10mW/cm
2, UV-light wave band 185 ~ 254nm, H
2o
2feed postition is for add continuously, and temperature controls at 50 ~ 70 DEG C.
Preferably, step 4 add ferric sulfate massfraction be more than 90%, feed rate is 20 ~ 40min, and temperature of reaction is 40 degrees Celsius, and gained tertiary iron phosphate particle diameter should be less than 3.0 μm.
Preferably, the physical separation method described in step 5 comprise use filter press, centrifugation, spiral press filtration one or more.
Preferably, in step 6, phosphoric acid concentration used is 0.5mol/L, and reaction pH controls below 1.0, until all dissolved by tertiary iron phosphate.
Preferably, sodium hydroxide readjustment pH to 1.8 ~ 2.4 described in step 7.
Preferably, the method for step 9 dried recovered tertiary iron phosphate comprise spraying dry, lyophilize, oven drying, seasoning, microwave drying one or more.
Tertiary iron phosphate median size prepared by present method is less than 50nm.
Compared with public technology, there is following advantage in the present invention: the present invention utilizes special oxidation, precipitation, conversion and isolation technique are effectively by the organic matter degradation in nickel-plating waste liquid with while reclaiming nickel ion, also by the Hypophosporous Acid, 50 root in nickel-plating waste liquid, orthophosphite ions is converted into positive phosphorus acid ion and adds iron ion further and is converted into the recycling of tertiary iron phosphate precipitation, the present invention also make use of originally special technique by preparation tertiary iron phosphate size controlling within 50nm, belong to the tertiary iron phosphate of cell-grade, therefore the present invention has good environmental benefit and economic benefit.
Embodiment
Object is reached and effect is easy to understand in order to make technique means of the present invention, creation characteristic, workflow, using method, below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1
(COD is 50,000 mg/L to get the chemical nickel plating waste solution of 5 elevated concentrations, Ni is 10g/L), filtered by hyperfiltration membrane assembly and remove small granular suspended matters impurity, then once by the nickel ion in the ion exchange resin column Recycling of waste liquid of 2 liters of series connection, the nickel of 99.9% is recycled into single nickel salt, except nickel waste liquid is added to 10mW/cm
2, in the photoreactor of the ultraviolet source of 185 ~ 254nm, about adding sulfuric acid adjust ph to 3.5, add the H of 600mM continuously
2o
2, temperature controls at 60 DEG C, reaction 180min, the ferric sulfate adding massfraction more than 90% by certain operation obtains raw phosphoric acid iron precipitation, tertiary iron phosphate precipitation is separated by filter press method with waste liquid, obtain elementary tertiary iron phosphate throw out, after deionized water rinsing, tertiary iron phosphate precipitation is separated by filter press with clear liquid, repeatedly rinse separation 20 times, obtain elementary tertiary iron phosphate product, and then the pH condition of 1.0 is reached by the phosphoric acid adding 0.5mol/L, reaction is heated to 70 DEG C, elementary tertiary iron phosphate product is dissolved, add the pH condition that a certain amount of sodium hydroxide pulls back to 2.4 afterwards again, continue slowly to add sodium hydroxide in 2h, add nanoscale iron phosphate in process to precipitate successively, tertiary iron phosphate precipitation is separated by filter press with waste liquid, obtain elementary tertiary iron phosphate throw out, after deionized water rinsing, tertiary iron phosphate precipitation is separated by filter press method with clear liquid, repeatedly rinse separation 20 times, then drying treatment obtains nanoscale iron phosphate product.
Embodiment 2
(COD is 20,000 mg/L to get the chemical nickel plating waste solution of 5 liters of lower concentrations, Ni is 4g/L), small granular suspended matters impurity is removed by tube type filter membrance component filters, then once by the nickel ion in the iron carbon post Recycling of waste liquid of 2 liters of series connection, the nickel of 99.9% is recycled into single nickel salt, except nickel waste liquid is added to 5mW/cm
2, in the photoreactor of the ultraviolet source of 185 ~ 254nm, about adding sulfuric acid adjust ph to 3.0, add the H of 400mM continuously
2o
2, temperature controls at 65 DEG C, reaction 180min, the ferric sulfate adding massfraction more than 90% by certain operation obtains raw phosphoric acid iron precipitation, tertiary iron phosphate precipitation is separated by centrifugal method with waste liquid, obtain elementary tertiary iron phosphate throw out, after deionized water rinsing, tertiary iron phosphate precipitation is passed through centrifugation with clear liquid, repeatedly rinse separation 20 times, obtain elementary tertiary iron phosphate product, and then the pH condition of 1.0 is reached by the phosphoric acid adding 0.5mol/L, reaction is heated to 65 DEG C, elementary tertiary iron phosphate product is dissolved, add the pH condition that a certain amount of sodium hydroxide pulls back to 2.0 afterwards again, continue slowly to add sodium hydroxide in 2h, add nanoscale iron phosphate in process to precipitate successively, tertiary iron phosphate precipitation is passed through centrifugation with waste liquid, obtain elementary tertiary iron phosphate throw out, after deionized water rinsing, tertiary iron phosphate precipitation is separated by filter press method with clear liquid, repeatedly rinse separation 15 times, then drying treatment obtains nanoscale iron phosphate product.
Embodiment 3
(COD is 30,000 mg/L to get the chemical nickel plating waste solution of 5 elevated concentrations, Ni is 8g/L), filtered by hyperfiltration membrane assembly and remove small granular suspended matters impurity, then once by the nickel ion in the ion exchange resin column Recycling of waste liquid of 2 liters of series connection, the nickel of 99.9% is recycled into single nickel salt, except nickel waste liquid is added to 10mW/cm
2, in the photoreactor of the ultraviolet source of 185 ~ 254nm, add sulfuric acid adjust ph to 4, add the H of 600mM continuously
2o
2, temperature controls at 60 DEG C, reaction 180min, the ferric sulfate adding massfraction more than 90% by certain operation obtains raw phosphoric acid iron precipitation, tertiary iron phosphate precipitation is separated by filter press method with waste liquid, obtain elementary tertiary iron phosphate throw out, after deionized water rinsing, tertiary iron phosphate precipitation is separated by filter press with clear liquid, repeatedly rinse separation 20 times, obtain elementary tertiary iron phosphate product, and then the pH condition of 1.0 is reached by the phosphoric acid adding 0.5mol/L, reaction is heated to 70 DEG C, elementary tertiary iron phosphate product is dissolved, add the pH condition that a certain amount of sodium hydroxide pulls back to 2.4 afterwards again, continue slowly to add sodium hydroxide in 2h, add nanoscale iron phosphate in process to precipitate successively, tertiary iron phosphate precipitation is separated by filter press with waste liquid, obtain elementary tertiary iron phosphate throw out, after deionized water rinsing, tertiary iron phosphate precipitation is separated by filter press method with clear liquid, repeatedly rinse separation 20 times, then drying treatment obtains nanoscale iron phosphate product.
Embodiment 4
(COD is 50,000 mg/L to get the chemical nickel plating waste solution of 5 liters of lower concentrations, Ni is 8g/L), small granular suspended matters impurity is removed by tube type filter membrance component filters, then once by the nickel ion in the iron carbon post Recycling of waste liquid of 2 liters of series connection, the nickel of 99.9% is recycled into single nickel salt, except nickel waste liquid is added to 5mW/cm
2, in the photoreactor of the ultraviolet source of 185 ~ 254nm, add sulfuric acid adjust ph to 3.5, add the H of 400mM continuously
2o
2, temperature controls at 65 DEG C, reaction 180min, the ferric sulfate adding massfraction more than 90% by certain operation obtains raw phosphoric acid iron precipitation, tertiary iron phosphate precipitation is separated by centrifugal method with waste liquid, obtain elementary tertiary iron phosphate throw out, after deionized water rinsing, tertiary iron phosphate precipitation is passed through centrifugation with clear liquid, repeatedly rinse separation 20 times, obtain elementary tertiary iron phosphate product, and then the pH condition of 1.0 is reached by the phosphoric acid adding 0.5mol/L, reaction is heated to 65 DEG C, elementary tertiary iron phosphate product is dissolved, add the pH condition that a certain amount of sodium hydroxide pulls back to 2.0 afterwards again, continue slowly to add sodium hydroxide in 2h, add nanoscale iron phosphate in process to precipitate successively, tertiary iron phosphate precipitation is passed through centrifugation with waste liquid, obtain elementary tertiary iron phosphate throw out, after deionized water rinsing, tertiary iron phosphate precipitation is separated by filter press method with clear liquid, repeatedly rinse separation 15 times, then drying treatment obtains nanoscale iron phosphate product.
More than show and describe ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and specification sheets just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (10)
1. utilize chemical nickel plating waste solution to prepare a method for battery-grade iron phosphate, it is characterized in that: comprise the following steps:
Step 1, chemical nickel plating waste solution concentrated be discharged into equalizing tank and carry out preliminary filtration, the small-particle impurity in removing waste water;
Step 2, utilize ion-exchange, nickel ion reclaims by the method for electrophoresis and displacement;
Step 3, the Hypophosporous Acid, 50 root in chemical nickel plating waste solution and orthophosphite ions are oxidized to positive phosphorus acid ion, under ultraviolet light irradiation, add to nickel-plating waste liquid the H that concentration is 300mM ~ 600mM continuously
2o
2, reaction 60 ~ 180min;
Step 4, add ferric sulfate phosphate anion is precipitated, obtain raw phosphoric acid iron precipitation, tertiary iron phosphate precipitation is separated by physical separation method with waste liquid, obtains elementary tertiary iron phosphate throw out;
Step 5, by after deionized water rinsing, tertiary iron phosphate precipitation is separated by physical separation method with clear liquid, repeatedly rinses separation ten times to 20 times, obtain elementary tertiary iron phosphate product;
Step 6, add phosphoric acid adjusted to ph, elementary tertiary iron phosphate product is dissolved;
Step 7, phosphoric acid-tertiary iron phosphate mixed solution is heated to 65 ~ 75 DEG C, adds sodium hydroxide readjustment pH value, continue slowly to add sodium hydroxide in 2h, add nanoscale iron phosphate in process and precipitate successively;
Step 8, by tertiary iron phosphate precipitation be separated by physical separation method with waste liquid, obtain elementary tertiary iron phosphate throw out;
Step 9, by after deionized water rinsing, tertiary iron phosphate precipitation be separated by physical separation method with clear liquid, repeatedly rinse separation ten times to 20 times, then drying treatment obtains nanoscale iron phosphate product.
2. a kind of method utilizing chemical nickel plating waste solution to prepare battery-grade iron phosphate according to claim 1, is characterized in that: the nickel-plating waste liquid pH value described in step 3 is between 3-4, described ultraviolet light intensity 1 ~ 10mW/cm
2, UV-light wave band 185 ~ 254nm, H
2o
2feed postition is for add continuously, and temperature controls at 50 ~ 70 DEG C.
3. a kind of method utilizing chemical nickel plating waste solution to prepare battery-grade iron phosphate according to claim 1, it is characterized in that: step 4 add ferric sulfate massfraction be more than 90%, feed rate is 20 ~ 40min, temperature of reaction is 40 degrees Celsius, and gained tertiary iron phosphate particle diameter should be less than 3.0 μm.
4. a kind of method utilizing chemical nickel plating waste solution to prepare battery-grade iron phosphate according to claim 1, is characterized in that: the physical separation method described in step 5 comprise use filter press, centrifugation, spiral press filtration one or more.
5. a kind of method utilizing chemical nickel plating waste solution to prepare battery-grade iron phosphate according to claim 1, is characterized in that: in step 6, phosphoric acid concentration used is 0.5mol/L, and reaction pH controls below 1.0, until all dissolved by tertiary iron phosphate.
6. a kind of method utilizing chemical nickel plating waste solution to prepare battery-grade iron phosphate according to claim 1, is characterized in that:, sodium hydroxide readjustment pH to 1.8 ~ 2.4 described in step 7.
7. a kind of method utilizing chemical nickel plating waste solution to prepare battery-grade iron phosphate according to claim 1, is characterized in that: the method for step 9 dried recovered tertiary iron phosphate comprise spraying dry, lyophilize, oven drying, seasoning, microwave drying one or more.
8. a kind of method utilizing chemical nickel plating waste solution to prepare battery-grade iron phosphate according to claim 1, it is characterized in that: the nickel-plating waste liquid described in step 1 is used chemical nickel plating tank liquor, and it contains one or more in organism, hypophosphite ion, orthophosphite ions, nickel ion.
9. a kind of method utilizing chemical nickel plating waste solution to prepare battery-grade iron phosphate according to claim 1, is characterized in that: the filter method described in step 1 comprises the combination of tubular type micro-filtration, ultrafiltration.
10. a kind of method utilizing chemical nickel plating waste solution to prepare battery-grade iron phosphate according to claim 1, is characterized in that: the tertiary iron phosphate median size prepared by present method is less than 50nm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110482513A (en) * | 2019-08-15 | 2019-11-22 | 广州科城环保科技有限公司 | A method of chemically nickel-plating waste liquid recycles graininess ferric orthophosphate |
| CN111232945A (en) * | 2020-03-19 | 2020-06-05 | 王敏 | Preparation method of battery-grade iron phosphate |
| CN112142030A (en) * | 2020-08-31 | 2020-12-29 | 合肥国轩高科动力能源有限公司 | Preparation method of low-cost low-temperature lithium iron phosphate |
| CN116425134A (en) * | 2023-02-10 | 2023-07-14 | 乐清力川环保科技有限公司 | Method for preparing super-battery-level ferric phosphate by using chemical nickel plating aging liquid |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3969246A (en) * | 1974-08-06 | 1976-07-13 | John Cunningham | Chromium removal and recovery process |
| CN101462704A (en) * | 2008-12-29 | 2009-06-24 | 刘世琦 | Production method of ultrafine cell level ferric orthophosphate |
| CN101481104A (en) * | 2009-02-11 | 2009-07-15 | 刘世琦 | Method for producing high purity battery level ferric pyrophosphate from pickle liquor |
| CN102616961A (en) * | 2012-03-29 | 2012-08-01 | 李朝林 | Method for degrading organic pollutant and recycling phosphate in chemical nickel-plating waste liquid |
| CN102849702A (en) * | 2012-09-07 | 2013-01-02 | 浙江振华新能源科技有限公司 | Preparation method for nanometer spherical ferric phosphate |
| CN104538629A (en) * | 2015-01-15 | 2015-04-22 | 杨志宽 | Method for preparing spherical nano iron phosphate |
-
2015
- 2015-08-27 CN CN201510536569.4A patent/CN105129757A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3969246A (en) * | 1974-08-06 | 1976-07-13 | John Cunningham | Chromium removal and recovery process |
| CN101462704A (en) * | 2008-12-29 | 2009-06-24 | 刘世琦 | Production method of ultrafine cell level ferric orthophosphate |
| CN101481104A (en) * | 2009-02-11 | 2009-07-15 | 刘世琦 | Method for producing high purity battery level ferric pyrophosphate from pickle liquor |
| CN102616961A (en) * | 2012-03-29 | 2012-08-01 | 李朝林 | Method for degrading organic pollutant and recycling phosphate in chemical nickel-plating waste liquid |
| CN102849702A (en) * | 2012-09-07 | 2013-01-02 | 浙江振华新能源科技有限公司 | Preparation method for nanometer spherical ferric phosphate |
| CN104538629A (en) * | 2015-01-15 | 2015-04-22 | 杨志宽 | Method for preparing spherical nano iron phosphate |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110482513A (en) * | 2019-08-15 | 2019-11-22 | 广州科城环保科技有限公司 | A method of chemically nickel-plating waste liquid recycles graininess ferric orthophosphate |
| CN110482513B (en) * | 2019-08-15 | 2021-06-29 | 广州科城环保科技有限公司 | Method for recovering granular ferric orthophosphate from chemical nickel plating waste liquid |
| CN111232945A (en) * | 2020-03-19 | 2020-06-05 | 王敏 | Preparation method of battery-grade iron phosphate |
| CN111232945B (en) * | 2020-03-19 | 2021-09-24 | 王敏 | Preparation method of battery-grade iron phosphate |
| CN112142030A (en) * | 2020-08-31 | 2020-12-29 | 合肥国轩高科动力能源有限公司 | Preparation method of low-cost low-temperature lithium iron phosphate |
| CN116425134A (en) * | 2023-02-10 | 2023-07-14 | 乐清力川环保科技有限公司 | Method for preparing super-battery-level ferric phosphate by using chemical nickel plating aging liquid |
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Address after: 523000, B building, building IT, international finance research and development center, Songshan hi tech Industrial Development Zone, Guangdong, Dongguan, 6 Applicant after: Dongguan Dao Hui environmental protection Polytron Technologies Inc Address before: 523808 Guangdong province Dongguan Songshan Lake high tech Industrial Development Zone No. 9 Keyuan pine floor 411A room Applicant before: Dongguan Dohill Environmental Protection Technology Co., Ltd. |
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Application publication date: 20151209 |