CN101353210A - Method for processing aluminum section bar chromizing waste water with calcium sulfite type desulphurization mortar - Google Patents
Method for processing aluminum section bar chromizing waste water with calcium sulfite type desulphurization mortar Download PDFInfo
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- CN101353210A CN101353210A CNA2008101986510A CN200810198651A CN101353210A CN 101353210 A CN101353210 A CN 101353210A CN A2008101986510 A CNA2008101986510 A CN A2008101986510A CN 200810198651 A CN200810198651 A CN 200810198651A CN 101353210 A CN101353210 A CN 101353210A
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Abstract
The invention discloses a method for treating aluminum profile chromaking wastewater by calcium sulfite desulphurizing mortar. In the method, firstly sulphuric acid is used for adjusting the pH value of aluminum profile chromaking wastewater in a collection tank to be 2-4; then calcium sulfite desulphurizing mortar is added, sufficient stirring is carried out, hexavalent chromium in aluminum profile chromaking wastewater is deoxidized to trivalent chromium; then NaOH is added, the pH value of the wastewater is adjusted to be 7.5-8.5, and trivalent chromium in the wastewater is changed to Cr(OH)3; meanwhile fluorin ions in the wastewater react with calcium hydroxide and calcium oxide in desulphurizing mortar, and CaF2 is produced, and polyacrylamide which is taken as a flocculant is added, after the treatment, the concentration of chrome in water is less than 0.1 mg/Kg, and the concentration of fluorion ion is less than 10 mg/Kg. By utilizing the method of the invention, calcium sulfite desulphurizing mortar is utilized, and the cost for treating aluminum profile chromaking wastewater is reduced, meanwhile hexavalent chromium and fluorin in the wastewater are removed so as to achieving treating waste by waste.
Description
Technical field
The present invention relates to handle the method for aluminum section bar chromizing waste water, particularly relate to the method for processing aluminum section bar chromizing waste water with calcium sulfite type desulphurization mortar, belong to environmental technology field.
Background technology
Water is a kind of very valuable resource, and outside the water pollution organic matter removal polluted, the pollution of heavy metal also more and more caused people's attention.Sexavalent chrome toxicity is big, hazardness strong, energy is carcinogenic; In addition, the fluorine content in the water also need be controlled.Aluminum section bar chromizing waste water contains pollutents such as sexavalent chrome and fluorine, and present treatment process has: liquid membrane separation method, solvent extration, medicament reduction method and absorption method etc.Aluminum section bar chromizing waste water is handled and is mostly to adopt pharmaceutical chemicals S-WAT (potassium), Sulfothiorine (potassium), sulfurous gas etc. to make reductive agent on the engineering, and hexavalent chrome reduction is become trivalent chromium, and precipitation is removed then.This method cost is higher, and can't remove the fluorion in the waste water.
Calcium sulfite type desulphurization mortar is meant the byproduct that employing lime-flue gas desulfurization of calcium sulfite method obtains, and it mainly consists of calcium sulfite, the not calcium hydroxide of complete reaction and calcium oxide as yet.Calcium sulfite type desulphurization mortar comprises the desulfurization slurry that the desulphurize fly ash that obtains through super-dry and undried obtain, and is difficult at present use.Therefore, utilize processing aluminum section bar chromizing waste water with calcium sulfite type desulphurization mortar, the treatment of wastes with processes of wastes against one another removes sexavalent chrome and fluorine in the waste water simultaneously, and can reduce the processing cost of waste water.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, a kind of method of processing aluminum section bar chromizing waste water of cheapness is provided, realize the treatment of wastes with processes of wastes against one another.
Purpose of the present invention is achieved through the following technical solutions:
The method of processing aluminum section bar chromizing waste water with calcium sulfite type desulphurization mortar comprises the steps and processing condition:
(1) with sulfuric acid the pH value of the aluminum section bar chromizing waste water in the collecting tank is transferred to 2～4;
(2) add calcium sulfite type desulphurization mortar, fully stirred 10～15 minutes, the hexavalent chrome reduction in the aluminum section bar chromizing waste water is become trivalent chromium; Described calcium sulfite type desulphurization mortar add-on (weight ratio) is a chromizing waste water 1/1000～6/1000;
(3) add NaOH, the wastewater pH that step (2) is handled transfers to 7.5～8.5, makes that the trivalent chromium in the waste water generates Cr (OH)
3Fluorion in the waste water and the calcium hydroxide in the desulfurized mortar and calcium oxide reaction generate CaF simultaneously
2, and adding polyacrylamide as flocculation agent, the add-on of flocculation agent (weight ratio) is a chromizing waste water 1/10000～3/10000, makes Cr (OH) in the waste water
3And CaF
2Rapid precipitation, chromium concn is lower than 0.1mg/Kg in the water after handling, fluorinion concentration is lower than 10mg/Kg.
Described calcium sulfite type desulphurization mortar is meant the byproduct that employing lime-flue gas desulfurization of calcium sulfite method obtains, comprise the desulfurization slurry that the desulphurize fly ash that obtains through super-dry and undried obtain, it mainly consists of calcium sulfite, the not calcium hydroxide of complete reaction and calcium oxide as yet, and calcium sulfite accounts for 20%～70% of calcium sulfite type desulphurization mortar weight.
Described aluminum section bar chromizing waste water is meant the waste water that contains sexavalent chrome and fluorine that produces in the aluminium shape surface processing, and principal pollutant are sexavalent chrome and fluorion, and wherein hexavalent chromium concentration is 2～20mg/Kg, and fluorinion concentration is 15～80mg/Kg.
With respect to prior art, the present invention has following advantage and beneficial effect:
1. calcium sulfite type desulphurization mortar is not utilized effectively at present as yet, and mainly based on landfill, this patent is used to handle aluminum section bar chromizing waste water with it, can realize the treatment of wastes with processes of wastes against one another.
2. calcium sulfite type desulphurization mortar is industrial waste, and is cheap, compares with Industrial products such as S-WAT, Sulfothiorine, has tangible cost advantage.
3. calcium sulfite type desulphurization mortar mainly consists of calcium sulfite, the not calcium hydroxide of complete reaction and calcium oxide as yet, and wherein calcium sulfite is used for reduction of hexavalent chromium, and calcium hydroxide and calcium oxide provide calcium to be used for and the fluorine reaction generates the Calcium Fluoride (Fluorspan) precipitation.Chromium concn is lower than 0.1mg/Kg in the water after handling, fluorinion concentration is lower than 10mg/Kg, reaches the trade effluent secondary discharge standard.
Embodiment
The invention will be further described below in conjunction with embodiment, but the scope of protection of present invention is not limited to the scope of embodiment statement.
Embodiment 1
6 tons of first factory aluminum section bar chromizing waste waters, wherein hexavalent chromium concentration is 2mg/Kg, fluorinion concentration is 45mg/Kg.The calcium sulfite type desulphurization ash of certain power plant is formed (weight percent) and is: calcium sulfite 40%, lime 4%, calcium hydroxide 4%, lime carbonate 22%, flyash 30%.
The method of processing aluminum section bar chromizing waste water with calcium sulfite type desulphurization mortar comprises the steps:
(1) with sulfuric acid the pH value of the chromate waste water in the collecting tank is transferred to 2;
(2) add 12 kilograms of calcium sulfite type desulphurization ashes, stirred 15 minutes, the hexavalent chrome reduction in the aluminum section bar chromizing waste water is become trivalent chromium;
(3) add the PH to 8 of NaOH, stirred 10 minutes, make that the trivalent chromium in the waste water becomes Cr (OH) waste water
3Fluorion in the waste water and the calcium hydroxide in the desulfurized mortar and calcium oxide reaction generate CaF simultaneously
2, the polyacrylamide that adds aluminum section bar chromizing waste water weight 2/10000ths is as flocculation agent, makes throw out rapid precipitation in the waste water.
Chromic content is reduced to 0.024mg/Kg in the water of processing back, and fluorinion concentration is 8mg/Kg.
Calcium sulfite type desulphurization mortar mainly consists of calcium sulfite, the not calcium hydroxide of complete reaction and calcium oxide as yet, and wherein calcium sulfite is used for reduction of hexavalent chromium, and calcium hydroxide and calcium oxide provide calcium to be used for and the fluorine reaction generates the Calcium Fluoride (Fluorspan) precipitation.Handle back water and reach the trade effluent secondary discharge standard.The used calcium sulfite type desulphurization mortar of present embodiment is not utilized effectively at present as yet, and mainly based on landfill, present embodiment is used to handle aluminum section bar chromizing waste water with it, can realize the treatment of wastes with processes of wastes against one another.And calcium sulfite type desulphurization mortar is industrial waste, and is cheap, compares with Industrial products such as S-WAT, Sulfothiorine, has tangible cost advantage.
Embodiment 2
6 tons of first factory aluminum section bar chromizing waste waters, wherein hexavalent chromium concentration is 2mg/Kg, fluorinion concentration is 45mg/Kg.The calcium sulfite type desulphurization slurry of certain power plant is formed (weight percent) and is: calcium sulfite 20%, lime 2%, calcium hydroxide 2%, lime carbonate 11%, flyash 15%, water 50%.
The method of processing aluminum section bar chromizing waste water with calcium sulfite type desulphurization mortar comprises the steps:
(1) with sulfuric acid the pH value of the chromate waste water in the collecting tank is transferred to 3;
(2) add 24 kilograms in calcium sulfite type desulphurization slurry, stir after 12 minutes, the hexavalent chrome reduction in the aluminum section bar chromizing waste water is become trivalent chromium;
(3) add the pH to 8.5 of KOH, stirred 10 minutes, make that the trivalent chromium in the waste water becomes Cr (OH) waste water
3Fluorion in the waste water and the calcium hydroxide in the desulfurized mortar and calcium oxide reaction generate CaF simultaneously
2, the polyacrylamide that adds aluminum section bar chromizing waste water weight 2/10000ths is as flocculation agent, makes throw out rapid precipitation in the waste water.
Chromic content is reduced to 0.019mg/Kg in the water of processing back, and fluorinion concentration is 7mg/Kg.
Embodiment 3
6 tons of second factory aluminum section bar chromizing waste waters, wherein hexavalent chromium concentration is 10mg/Kg, fluorinion concentration is 15mg/Kg.The calcium sulfite type desulphurization ash of certain power plant is formed (weight percent) and is: calcium sulfite 70%, lime 2%, calcium hydroxide 2%, lime carbonate 10%, flyash 16%.
The method of processing aluminum section bar chromizing waste water with calcium sulfite type desulphurization mortar comprises the steps:
(1) with sulfuric acid the pH value of the chromate waste water in the collecting tank is transferred to 2;
(2) add 6 kilograms of calcium sulfite type desulphurization ashes, stirred 15 minutes, the hexavalent chrome reduction in the aluminum section bar chromizing waste water is become trivalent chromium;
(3) add the PH to 8 of NaOH, stirred 10 minutes, make that the trivalent chromium in the waste water becomes Cr (OH) waste water
3Fluorion in the waste water and the calcium hydroxide in the desulfurized mortar and calcium oxide reaction generate CaF simultaneously
2, add aluminum section bar chromizing waste water weight ten thousand/ polyacrylamide as flocculation agent, make throw out rapid precipitation in the waste water.
Chromic content is reduced to 0.034mg/Kg in the water of processing back, and fluorinion concentration is 7mg/Kg.
Embodiment 4
6 tons of second factory aluminum section bar chromizing waste waters, wherein hexavalent chromium concentration is 10mg/Kg, fluorinion concentration is 15mg/Kg.The calcium sulfite type desulphurization slurry of certain power plant is formed (weight percent) and is: calcium sulfite 35%, lime 1%, calcium hydroxide 1%, lime carbonate 5%, flyash 8%, water 50%.
The method of processing aluminum section bar chromizing waste water with calcium sulfite type desulphurization mortar comprises the steps:
(1) with sulfuric acid the pH value of the chromate waste water in the collecting tank is transferred to 4;
(2) add 12 kilograms in calcium sulfite type desulphurization slurry, stirred 12 minutes, the hexavalent chrome reduction in the aluminum section bar chromizing waste water is become trivalent chromium;
(3) add the PH to 8.5 of KOH, stirred 10 minutes, make that the trivalent chromium in the waste water becomes Cr (OH) waste water
3Fluorion in the waste water and the calcium hydroxide in the desulfurized mortar and calcium oxide reaction generate CaF simultaneously
2, add an amount of flocculation agent, make throw out rapid precipitation in the waste water.
Chromic content is reduced to 0.021mg/Kg in the water of processing back, and fluorinion concentration is 6mg/Kg.
Embodiment 5
6 tons of third factory's aluminum section bar chromizing waste waters, wherein hexavalent chromium concentration is 20mg/Kg, fluorinion concentration is 80mg/Kg.The calcium sulfite type desulphurization ash of certain power plant is formed (weight percent) and is: calcium sulfite 50%, lime 3%, calcium hydroxide 4%, lime carbonate 15%, flyash 28%.
The method of processing aluminum section bar chromizing waste water with calcium sulfite type desulphurization mortar comprises the steps:
(1) with sulfuric acid the pH value of the chromate waste water in the collecting tank is transferred to 2;
(2) add 18 kilograms of calcium sulfite type desulphurization ashes, stirred 15 minutes, the hexavalent chrome reduction in the aluminum section bar chromizing waste water is become trivalent chromium;
(3) add the PH to 8 of NaOH, stirred 10 minutes, make that the trivalent chromium in the waste water becomes Cr (OH) waste water
3Fluorion in the waste water and the calcium hydroxide in the desulfurized mortar and calcium oxide reaction generate CaF simultaneously
2, the polyacrylamide that adds aluminum section bar chromizing waste water weight 3/10000ths is as flocculation agent, makes throw out rapid precipitation in the waste water.
Chromic content is reduced to 0.048mg/Kg in the water of processing back, and fluorinion concentration is 10mg/Kg.
Embodiment 6
6 tons of third factory's aluminum section bar chromizing waste waters, wherein hexavalent chromium concentration is 20mg/Kg, fluorinion concentration is 80mg/Kg.The calcium sulfite type desulphurization slurry of certain power plant is formed (weight percent) and is: calcium sulfite 25%, lime 1.5%, calcium hydroxide 2%, lime carbonate 7.5%, flyash 14%, water 50%.
The method of processing aluminum section bar chromizing waste water with calcium sulfite type desulphurization mortar comprises the steps:
(1) with sulfuric acid the pH value of the chromate waste water in the collecting tank is transferred to 3;
(2) add 36 kilograms in calcium sulfite type desulphurization slurry, stir after 12 minutes, the hexavalent chrome reduction in the aluminum section bar chromizing waste water is become trivalent chromium;
(3) add the pH to 8.5 of KOH, stirred 10 minutes, make that the trivalent chromium in the waste water becomes Cr (OH) waste water
3Fluorion in the waste water and the calcium hydroxide in the desulfurized mortar and calcium oxide reaction generate CaF simultaneously
2, the polyacrylamide that adds aluminum section bar chromizing waste water weight 3/10000ths is as flocculation agent, makes throw out rapid precipitation in the waste water.
Chromic content is reduced to 0.029mg/Kg in the water of processing back, and fluorinion concentration is 9mg/Kg.
Claims (3)
1, the method for processing aluminum section bar chromizing waste water with calcium sulfite type desulphurization mortar is characterized in that comprising the steps and processing condition:
(1) with sulfuric acid the pH value of the aluminum section bar chromizing waste water in the collecting tank is transferred to 2～4;
(2) add calcium sulfite type desulphurization mortar, fully stirred 10～15 minutes, the hexavalent chrome reduction in the aluminum section bar chromizing waste water is become trivalent chromium; Described calcium sulfite type desulphurization mortar add-on is chromizing waste water 1/1000～6/1000 (weight);
(3) add NaOH, the wastewater pH that step (2) is handled transfers to 7.5～8.5, makes that the trivalent chromium in the waste water becomes Cr (OH)
3Fluorion in the waste water and the calcium hydroxide in the desulfurized mortar and calcium oxide reaction generate CaF simultaneously
2, and adding polyacrylamide as flocculation agent, the add-on of flocculation agent is chromizing waste water 1/10000～3/10000 (weight), makes Cr (OH) in the waste water
3And CaF
2Rapid precipitation, chromium concn is lower than 0.1mg/Kg in the water after handling, fluorinion concentration is lower than 10mg/Kg.
2, the method for processing aluminum section bar chromizing waste water with calcium sulfite type desulphurization mortar according to claim 1, it is characterized in that, described calcium sulfite type desulphurization mortar is meant the byproduct that employing lime-flue gas desulfurization of calcium sulfite method obtains, comprise the desulfurization slurry that the desulphurize fly ash that obtains through super-dry and undried obtain, mainly consist of calcium sulfite, the not calcium hydroxide of complete reaction and calcium oxide as yet, calcium sulfite accounts for 20%～70% of calcium sulfite type desulphurization mortar weight.
3, the method for processing aluminum section bar chromizing waste water with calcium sulfite type desulphurization mortar according to claim 1, it is characterized in that, described aluminum section bar chromizing waste water is meant the waste water that contains sexavalent chrome and fluorine that produces in the aluminium shape surface processing, wherein hexavalent chromium concentration is 2～20mg/Kg, and fluorinion concentration is 15～80mg/Kg.
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| CN101956192A (en) * | 2010-11-05 | 2011-01-26 | 西南大学 | Method for treating aluminum alloy trivalent chromium passivation solution waste |
| CN102258985A (en) * | 2011-06-15 | 2011-11-30 | 郭家延 | Material for treating fluorine-containing drinking water, and preparation method thereof |
| CN102674594A (en) * | 2012-05-31 | 2012-09-19 | 江苏锦绣铝业有限公司 | Process for preparing air purifying agent intermediate product by using aluminium product oxidization sewage |
| CN101733068B (en) * | 2010-02-03 | 2013-04-10 | 江苏锦绣铝业有限公司 | Method for preparing industrial drying agent by using nickeliferous waste liquor produced in aluminum surface treatment |
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- 2008-09-22 CN CN2008101986510A patent/CN101353210B/en not_active Expired - Fee Related
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| CN101733068B (en) * | 2010-02-03 | 2013-04-10 | 江苏锦绣铝业有限公司 | Method for preparing industrial drying agent by using nickeliferous waste liquor produced in aluminum surface treatment |
| CN101956192A (en) * | 2010-11-05 | 2011-01-26 | 西南大学 | Method for treating aluminum alloy trivalent chromium passivation solution waste |
| CN102258985A (en) * | 2011-06-15 | 2011-11-30 | 郭家延 | Material for treating fluorine-containing drinking water, and preparation method thereof |
| CN102674594A (en) * | 2012-05-31 | 2012-09-19 | 江苏锦绣铝业有限公司 | Process for preparing air purifying agent intermediate product by using aluminium product oxidization sewage |
| CN103304072A (en) * | 2013-07-11 | 2013-09-18 | 佛山市南海区大沥吉力达铝辅助材料厂 | Recycling method of industrial waste water |
| CN106277418A (en) * | 2015-05-27 | 2017-01-04 | 鞍钢股份有限公司 | A kind of method and device of processing waste water containing chrome |
| CN107698065A (en) * | 2017-11-14 | 2018-02-16 | 蚌埠市嘉实机电设备制造有限公司 | Caused dirty water purification method in a kind of production to aluminum products |
| CN111498960A (en) * | 2020-04-03 | 2020-08-07 | 广东韶钢松山股份有限公司 | Defluorination medicament and application thereof |
| CN112811507A (en) * | 2021-03-08 | 2021-05-18 | 沈阳大学 | Method for advanced reductive degradation of azo dye by using ultraviolet/magnesium desulfurization residues |
| CN114853210A (en) * | 2022-04-30 | 2022-08-05 | 美图（福建）铝业有限公司 | Treatment liquid and treatment process for aluminum product production wastewater |
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