CN102115276A - Method for treating hexavalent chromium wastewater by utilizing blast furnace slag - Google Patents
Method for treating hexavalent chromium wastewater by utilizing blast furnace slag Download PDFInfo
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- CN102115276A CN102115276A CN 201010563747 CN201010563747A CN102115276A CN 102115276 A CN102115276 A CN 102115276A CN 201010563747 CN201010563747 CN 201010563747 CN 201010563747 A CN201010563747 A CN 201010563747A CN 102115276 A CN102115276 A CN 102115276A
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- hexavalent chromium
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- furnace slag
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Abstract
The invention relates to a method for treating hexavalent chromium wastewater by utilizing blast furnace slag. The method comprises the following steps of: crushing blast furnace slag and carrying out ball milling and sieving on the crushed blast furnace slag; adjusting the pH value of hexavalent chromium wastewater to be 0.5-4.5; adding the hexavalent chromium wastewater to a container, putting the container in a velocity-modulated oscillator, feeding the blast furnace slag powder into the hexavalent chromium wastewater for adsorption treatment, and adjusting the pH value of the wastewater reaching adsorption balance to be 7-9; and filtering the wastewater to remove solid matters. The method provided by the invention has a simple and convenient treatment process and has an operation cost lower than that of a conventional method, and the content of residential hexavalent chromium in the treated wastewater is 0.5 mg/l lower than the sewage discharge standard. The method not only has the advantages of a common adsorption method, but also has a low cost and a good adsorption effect due to adoption of the blast furnace slag as an adsorbent, and is a method for treating a waste by using another waste.
Description
Technical field
The invention belongs to technical field of waste water processing, relate to the processing of chromate waste water, be specifically related to a kind of method of handling hexavalent chromium wastewater with blast furnace slag.
Background technology
Chromium and compound thereof are widely used in industries such as electroplating industry, metallurgical industry, mechanical industry, printing and dyeing, occupy an important position in national economy.Chromic toxicity hazard maximum in the chromium species is identified as " three cause thing " that have carcinogenic, teratogenesis shape, cause transgenation.Studies show that sexavalent chrome can be taken in the body and through bioconcentration by algae adds up, and takes in sexavalent chrome for a long time and can cause plant death.The cumulative sexavalent chrome constitutes the long-term threat to ecotope by the food chain conduction in the plant.Because chromic toxicity is very strong, U.S. EPA is classified sexavalent chrome as one of top toxic pollutant of preferentially control, and its ordering in inorganics series is only second to lead, second of row.Be the difficult point during industrial sewage is handled, also be a great problem that solution is badly in need of in current domestic and international water pollution control field always.Sexavalent chrome must be lower than 0.1mg/l in the U.S. EPA regulation tap water, and enterprise enters and receives that sexavalent chrome must be lower than 0.5mg/l in the dirty pipe network waste water.China classifies sexavalent chrome as need strict control first kind pollutent, stipulates chromic emission concentration≤0.5mg/l at " integrated wastewater discharge standard " of issuing and implementation in 1996 in (GB8978-96).
The method of handling at present both at home and abroad hexavalent chromium wastewater has multiple, and common have reduction method, microbial method, ion exchange method, an absorption method etc.The shortcoming of reduction method is to consume a large amount of chemical agents, and technology is loaded down with trivial details, complicated operation, and processing is not thorough, easily causes secondary pollution; The microbial method long processing period, and treatment capacity is limited; The shortcoming of ion exchange method is the one-time investment height, and Organic pollutants performance and antioxidant property are poor in the anti-waste water of resin, and when having different kinds of ions, this method is relatively poor to the selectivity of chromium, and regeneration, elution processes complexity, and cost is higher; Absorption method is a poisonous ionic method in a kind of removal waste water commonly used, has advantages such as treatment capacity is big, reusable, operational administrative is easy, working cost is low.But it is on the low side also to exist adsorptive capacity, and reaching adsorption equilibrium required time length or preparation process needs expensive some inevitable shortcomings such as chemical reagent.
Summary of the invention
At the problem that present hexavalent chromium wastewater treatment technology exists, the invention provides a kind of method with blast furnace slag processing hexavalent chromium wastewater, reach the purpose of the treatment of wastes with processes of wastes against one another, low-cost processes hexavalent chromium wastewater.
Method steps with blast furnace slag processing hexavalent chromium wastewater of the present invention is as follows:
(1) at first with blast furnace slag fragmentation, ball milling, to be sized to granularity be 0.5～10 μ m;
Usually the blast furnace slag chemical ingredients is by mass percentage: TiO
220～30%, ∑ Fe (total iron) 2～4%, SiO
218～30%, MgO5～10%, Al
2O
310～16%, all the other are CaO.
(2) be that the sulfuric acid of 0.1～1mol/l is the acidity agent with concentration, the pH that regulates hexavalent chromium wastewater is 0.5～4.5; Chromic concentration is 5～15mg/l in the general hexavalent chromium wastewater.
(3) hexavalent chromium wastewater that will regulate the pH value joins in the container, and container is put in the velocity-modulated oscillator, the blast furnace slag powder of step (1) preparation is added to carries out adsorption treatment in the hexavalent chromium wastewater again, vibrates under 50～300 rev/mins of conditions of rotating speed.
Chromic mass ratio is (25～200) in blast furnace slag powder that is added and the hexavalent chromium wastewater: 1.
(4) will reach that the pH value of waste water is adjusted to 7～9 after the adsorption equilibrium; Reach adsorption equilibrium when remaining hexavalent chromium concentration no longer changes in the waste water.
(5) above-mentioned pH value is adjusted to 7～9 waste water and filters, remove solids and get final product.
The analytical procedure of hexavalent chromium concentration is as follows in the waste water:
Utilize ultraviolet-visible spectrophotometer to measure the absorbancy of chromate waste water, be converted into corresponding concentration, analyze the sexavalent chrome strength of solution and change according to the Lambert-Beer law.
If the concentration of solution is certain, the degree of absorption of light be directly proportional with the thickness of liquid layer (Lambert law) then; The absorption of light is relevant with the quantity of the extinction material that light is run into, if extinction material is dissolved in the solvent of extinction not, and absorbancy be directly proportional with the concentration of extinction material (Beer law) then.Both are combined, just be called the Lambert-Beer law.Represent with following formula:
In the formula, A is an absorbancy; I
0Be incident intensity; I is a transmitted intensity; A is a specific absorbance; B is liquid layer thickness (path length), is unit with cm; C is the concentration of colored solutions.
Byproduct-the blast furnace slag of discharging from blast furnace in the inventive method utilization smelting pig iron process is handled hexavalent chromium wastewater, has obtained good effect, and entire treatment technology is simple, working cost is lower than ordinary method.The chromic content of residue all is lower than sewage drainage standard 0.5mg/l in the processed waste water.This method not only has the advantage of general absorption method, and is sorbent material with the blast furnace slag, and low, the advantages of good adsorption effect of cost is the method for a kind of " treatment of wastes with processes of wastes against one another ", for the blast furnace slag of China's bulk deposition finds the reasonable use approach.
Embodiment
The blast furnace slag that embodiment adopts comes from Chengde Iron and Steel Group Co., Ltd.
Embodiment 1
The method steps of handling hexavalent chromium wastewater with blast furnace slag is as follows:
(1) at first with blast furnace slag fragmentation, ball milling, to be sized to granularity be 5 μ m;
The blast furnace slag chemical ingredients is by mass percentage: TiO
225%, ∑ Fe (total iron) 3%, SiO
223%, MgO7%, Al
2O
313%, all the other are CaO.
(2) be that the sulfuric acid of 0.5mol/l is the acidity agent with concentration, the pH that regulates hexavalent chromium wastewater is 2.5; Chromic concentration is 10mg/l in the hexavalent chromium wastewater.
(3) hexavalent chromium wastewater that will regulate the pH value joins in the container, and container is put in the velocity-modulated oscillator, the blast furnace slag powder of step (1) preparation is added to carries out adsorption treatment in the hexavalent chromium wastewater again, vibrates under 180 rev/mins of conditions of rotating speed.
Chromic mass ratio is 120: 1 in blast furnace slag powder that is added and the hexavalent chromium wastewater.
(4) will reach that the pH value of waste water is adjusted to 8 after the adsorption equilibrium; Reach adsorption equilibrium when remaining hexavalent chromium concentration no longer changes in the waste water.
(5) above-mentioned pH value is adjusted to 8 waste water and filters, remove solids and get final product.
Hexavalent chromium concentration is 0.2mg/l in the processed waste water.
Embodiment 2
The method steps of handling hexavalent chromium wastewater with blast furnace slag is as follows:
(1) at first with blast furnace slag fragmentation, ball milling, to be sized to granularity be 10 μ m;
The blast furnace slag chemical ingredients is by mass percentage: TiO
230%, ∑ Fe (total iron) 4%, SiO
218%, MgO5%, Al
2O
316%, all the other are CaO.
(2) be that the sulfuric acid of 1mol/l is the acidity agent with concentration, the pH that regulates hexavalent chromium wastewater is 0.5; Chromic concentration is 15mg/l in the hexavalent chromium wastewater.
(3) hexavalent chromium wastewater that will regulate the pH value joins in the container, and container is put in the velocity-modulated oscillator, the blast furnace slag powder of step (1) preparation is added to carries out adsorption treatment in the hexavalent chromium wastewater again, vibrates under 300 rev/mins of conditions of rotating speed.
Chromic mass ratio is 200: 1 in blast furnace slag powder that is added and the hexavalent chromium wastewater.
(4) will reach that the pH value of waste water is adjusted to 9 after the adsorption equilibrium; Reach adsorption equilibrium when remaining hexavalent chromium concentration no longer changes in the waste water.
(5) above-mentioned pH value is adjusted to 9 waste water and filters, remove solids and get final product.
Hexavalent chromium concentration is 0.3mg/l in the processed waste water.
Embodiment 3
The method steps of handling hexavalent chromium wastewater with blast furnace slag is as follows:
(1) at first with blast furnace slag fragmentation, ball milling, to be sized to granularity be 0.5 μ m;
The blast furnace slag chemical ingredients is by mass percentage: TiO
220%, ∑ Fe (total iron) 2%, SiO
230%, MgO10%, Al
2O
310%, all the other are CaO.
(2) be that the sulfuric acid of 0.1mol/l is the acidity agent with concentration, the pH that regulates hexavalent chromium wastewater is 4.5; Chromic concentration is 5mg/l in the hexavalent chromium wastewater.
(3) hexavalent chromium wastewater that will regulate the pH value joins in the container, and container is put in the velocity-modulated oscillator, the blast furnace slag powder of step (1) preparation is added to carries out adsorption treatment in the hexavalent chromium wastewater again, vibrates under 50 rev/mins of conditions of rotating speed.
Chromic mass ratio is 25: 1 in blast furnace slag powder that is added and the hexavalent chromium wastewater.
(4) will reach that the pH value of waste water is adjusted to 7 after the adsorption equilibrium; Reach adsorption equilibrium when remaining hexavalent chromium concentration no longer changes in the waste water.
(5) above-mentioned pH value is adjusted to 7 waste water and filters, remove solids and get final product.
Hexavalent chromium concentration is 0.2mg/l in the processed waste water.
Claims (2)
1. handle the method for hexavalent chromium wastewater with blast furnace slag for one kind, it is characterized in that step is as follows:
(1) with blast furnace slag fragmentation, ball milling, to be sized to granularity be 0.5～10 μ m;
(2) with sulfuric acid be the acidity agent, the pH that regulates hexavalent chromium wastewater is 0.5～4.5;
(3) hexavalent chromium wastewater that will regulate the pH value joins in the container, and container is put in the velocity-modulated oscillator, the blast furnace slag powder of step (1) preparation is added to carries out adsorption treatment in the hexavalent chromium wastewater again, vibrates under 50～300 rev/mins of conditions of rotating speed;
Chromic mass ratio is (25～200) in blast furnace slag powder that is added and the hexavalent chromium wastewater: 1;
(4) will reach that the pH value of waste water is adjusted to 7～9 after the adsorption equilibrium;
(5) above-mentioned pH value is adjusted to 7～9 waste water and filters, remove solids.
2. handle the method for hexavalent chromium wastewater according to claim 1 is described with blast furnace slag, it is characterized in that with concentration being that the sulfuric acid of 0.1～1mol/l is the acidity agent.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102295340A (en) * | 2011-07-26 | 2011-12-28 | 新兴铸管股份有限公司 | Method for processing wastewater containing Cr<6+> |
| CN103754973A (en) * | 2013-12-30 | 2014-04-30 | 陕西科技大学 | Method for treating chlorpyrifos wastewater by using loess organic/inorganic compound adsorbent |
| CN104192938A (en) * | 2014-09-11 | 2014-12-10 | 中国科学院山西煤炭化学研究所 | Method for removing hexavalent chromium from brown coal |
| CN107008576A (en) * | 2017-03-22 | 2017-08-04 | 江西理工大学 | A kind of method that granulated copper slag settles microfine Pb-Zn tailings as flocculant |
| CN107029892A (en) * | 2017-03-22 | 2017-08-11 | 江西理工大学 | A kind of method that copper flash clinker settles microfine Pb-Zn tailings as flocculant |
| CN108246256A (en) * | 2018-01-23 | 2018-07-06 | 北京澳柯清洁煤气工程技术有限公司 | A kind of processing method for the waste that fluidized gasification generates |
| CN108928877A (en) * | 2018-07-23 | 2018-12-04 | 北京市环境卫生设计科学研究所 | A method of utilizing slag treatment rubbish concentrate |
| CN109250849A (en) * | 2018-09-22 | 2019-01-22 | 福建凤竹纺织科技股份有限公司 | A kind of processing method of textile waste |
| CN112174248A (en) * | 2020-10-29 | 2021-01-05 | 东北大学 | Method for adsorbing electroplating wastewater containing heavy metal nickel by using fly ash-based zeolite |
| CN112591843A (en) * | 2020-12-26 | 2021-04-02 | 昆明理工大学 | Method for treating heavy metal-containing acidic wastewater by using waste |
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| CN1611450A (en) * | 2003-10-31 | 2005-05-04 | 中国石油化工股份有限公司 | Waste water purifying agent, and its preparing method and use |
| CN101781050A (en) * | 2010-03-09 | 2010-07-21 | 江汉大学 | Method for treating low-concentration chromate waste water |
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2010
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| CN1611450A (en) * | 2003-10-31 | 2005-05-04 | 中国石油化工股份有限公司 | Waste water purifying agent, and its preparing method and use |
| CN101781050A (en) * | 2010-03-09 | 2010-07-21 | 江汉大学 | Method for treating low-concentration chromate waste water |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102295340A (en) * | 2011-07-26 | 2011-12-28 | 新兴铸管股份有限公司 | Method for processing wastewater containing Cr<6+> |
| CN103754973A (en) * | 2013-12-30 | 2014-04-30 | 陕西科技大学 | Method for treating chlorpyrifos wastewater by using loess organic/inorganic compound adsorbent |
| CN104192938A (en) * | 2014-09-11 | 2014-12-10 | 中国科学院山西煤炭化学研究所 | Method for removing hexavalent chromium from brown coal |
| CN107008576A (en) * | 2017-03-22 | 2017-08-04 | 江西理工大学 | A kind of method that granulated copper slag settles microfine Pb-Zn tailings as flocculant |
| CN107029892A (en) * | 2017-03-22 | 2017-08-11 | 江西理工大学 | A kind of method that copper flash clinker settles microfine Pb-Zn tailings as flocculant |
| CN107029892B (en) * | 2017-03-22 | 2019-08-02 | 江西理工大学 | A kind of method that copper flash clinker settles microfine Pb-Zn tailings as flocculant |
| CN108246256A (en) * | 2018-01-23 | 2018-07-06 | 北京澳柯清洁煤气工程技术有限公司 | A kind of processing method for the waste that fluidized gasification generates |
| CN108928877A (en) * | 2018-07-23 | 2018-12-04 | 北京市环境卫生设计科学研究所 | A method of utilizing slag treatment rubbish concentrate |
| CN109250849A (en) * | 2018-09-22 | 2019-01-22 | 福建凤竹纺织科技股份有限公司 | A kind of processing method of textile waste |
| CN109250849B (en) * | 2018-09-22 | 2021-08-27 | 福建凤竹纺织科技股份有限公司 | Treatment method of textile wastewater |
| CN112174248A (en) * | 2020-10-29 | 2021-01-05 | 东北大学 | Method for adsorbing electroplating wastewater containing heavy metal nickel by using fly ash-based zeolite |
| CN112591843A (en) * | 2020-12-26 | 2021-04-02 | 昆明理工大学 | Method for treating heavy metal-containing acidic wastewater by using waste |
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Application publication date: 20110706 |