CN102653437B - Method for treating yellow sludge obtained in neutralization of steel pickling waste water lime - Google Patents
Method for treating yellow sludge obtained in neutralization of steel pickling waste water lime Download PDFInfo
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Abstract
The invention relates to a method for treating yellow sludge obtained in neutralization of steel pickling waste water lime and belongs to the technical field of waste water treatment. The method for treating the yellow sludge obtained in neutralization of the steel pickling waste water lime comprises the following steps of: adding the filtered yellow sludge into a reaction tank by use of a sludge pump; adding iron acid water which comes from a pickling workshop and has the PH value of less than 2 into the yellow sludge, carrying out aeration, adjusting the PH value to be 4.5-5.5 and then filtering again; conveying yellowish-brown oxidized sludge into a heating bath, carrying out aeration, and stirring for oxidization; adjusting the PH value to be 10.5-11.5 by lime liquor, then heating to 100-130 DEG C by steam, and carrying out heat preservation for 25-50 minutes; adding sewage which is filtered again and has the PH value of 4.5-5.5, adjusting the PH value to be 6.5-7.5, and finishing the reaction; and finally, cooling to 45-55 DEG C, and filtering to obtain black magnetic iron-containing sludge. The method has the advantages of being simple in technology, convenient in operation, easy to control, low in processing cost and high in treatment efficiency, avoiding environmental pollution, changing a pollution source into a renewable resource, and the like.
Description
Technical field
The invention belongs to the steel pickling waste liquor processing technology field, particularly relate in a kind of steel pickling waste liquor lime and the treatment process of back yellow mud.
Background technology
At present, produce a large amount of poaching wastewaters in the iron and steel processing enterprise acid cleaning process, the main component of waste water is the aqueous solution that contains FeCl2 or the FeS04 of sour pH value≤2, oxidation by air forms the iron protoxide red precipitate of trivalent when the air of waste water and occurring in nature contacts, and causes the muddy polluted source of water.
Pickling iron and steel enterprise pickling waste waters generally adopts cheap basic treatment agent lime (calcium oxide) that acid-bearing wastewater is carried out neutralizing treatment in sewage treatment process, treatment process is lime to be blunged dissolve in the back formation calcium hydroxide adding acid-bearing wastewater, make neutrality that the acid waste water pH value reaches 6-8 by filter and press filtration after sewage again through pipe network enter advanced treatment and reclamation or discharging equation be FeCl2+Ca (OH) 2=Fe (OH) 2 ↓+CaClOOH do not dissolve in the neutralization reaction process fully because the solubleness of calcium oxide in water is very little, therefore produced that a large amount of oxide compounds can not be dissolved in the water and coated by ferrous ion and to form Fe (OH) 3a-FeOOH, the industrial sludge that mud mixture produces after press filtration becomes the tawny pollutent, in the middle of depositing and transporting, can produce polluting the second time of environment, do not have because the iron content magnitude is low utility value at present existing treating method be to handle the back landfill by the producer that has qualification to handle, brought serious economical load and to the pollution of environment to enterprise.
Summary of the invention
The technical problem of the present invention for existing in the solution known technology, and provide in a kind of steel pickling waste liquor lime and the treatment process of back yellow mud.
The purpose of this invention is to provide that a kind of to have technology simple, easy to operate, control easily, stable performance, process is reliable, the processing efficiency height has reached the pollution that the purpose that turns waste into wealth has been avoided environment, source of pollution has been become in the steel pickling waste liquor lime of characteristics such as renewable resource and the treatment process of the yellow mud in back.
The present invention is on the basis of the original sewage disposal of pickling iron and steel enterprise, utilize after the neutralizing treatment the tawny oxidized sludge with contain the iron waste water synthetic high iron content black magnetic breeze raw material of heating, recovery technology is simple, easy to operate, environment is not produced pollution, realized recycling economy at environment protection treating, the change source of pollution are renewable resource, for smelting iron and steel provides main raw material.
Treating processes of the present invention: will be lower than 2 Fe-laden acid wastewater from pickling workshop pH value and squeeze in the reaction tank with acid proof pump, add lime and make its acid-base neutralisation, simultaneously to carrying out aeration agitation in the reaction tank, regulate pH value=8, aeration oxidation 1 hour, the sewage after will neutralizing then filters with filter.Tawny oxidized sludge after the filtration is put in the reaction tank again with pump, adds to be lower than 2 iron content sour water from pickling workshop pH value, and regulate pH value and equal 5, aeration oxidation and then filtration, filtered sewage turns back to reaction tank and waits for next step processing.Tawny oxidized sludge after the filtration (filter cake is put in the heating bath also will (to contain crystal water 60%) after the available pressure filter press filtration) joins in the heating bath with slush pump, add in the reaction tank iron waste water that contains that pH value after filtering equals 5 in the heating bath according to the concentration of tawny oxidized sludge, open air aeration heating bath is carried out the oxidation stirring, regulating PH in the heating bath with lime liquid again equals 12 and treats that mud stops aeration agitation when being stirred to the pasty state of thickness with air aeration, the unlatching steam valve is heated, close most of steam when spending and keep micro-steam by carrying out insulation reaction 30 minutes when the mud temperature reaches 100, observing the mud color is that chocolate can not appear in pure black, and the detection iron-holder reaches 50% and is reaction end.The steam off valve stops heating, with water pump PH in the reaction tank is equaled 5 the iron waste water that contains and joins in the heating bath and to regulate pH value and equal reaction in 7 o'clock and finish.Opening the air aeration valve carries out aeration to heating bath and is cooled to 50 and squeezes into the water discharging filter cake that plate-and-frame filter press carries out after the press filtration press filtration with surge pump when spending and obtain black magnetic Z 250 mud.
The technical scheme that the treatment process of the yellow mud in the steel pickling waste liquor lime of the present invention and back is taked for the problem that solves the prior art existence is:
The treatment process of the yellow mud in the steel pickling waste liquor lime and back, the Fe-laden acid wastewater in pickling workshop is squeezed in the reaction tank with acid proof pump, add lime and make its acid-base neutralisation, through aeration, accent PH, filtration treatment, be characterized in: the Fe-laden acid wastewater pH value of regulating the pickling workshop with yellow mud is 4.5-5.5, aeration oxidation and then filtration; Tawny oxidized sludge after the filtration is transported in the heating bath, carries out the aeration agitation oxidation, and regulating pH value with liquor calcis is 10.5-11.5, heats to 100-130 ℃ of mud temperature with steam then, is incubated 25-50 minute; The sewage that adds pH value after filtration and be 4.5-5.5 cools off in heating bath, regulates pH value and equals 6.5-7.5, and reaction finishes; Be cooled to 45-55 ℃, filter and obtain the black magnetic iron containing sludge.
The treatment process of the yellow mud in the steel pickling waste liquor lime of the present invention and back can also adopt following technical measures:
The treatment process of the yellow mud in the described steel pickling waste liquor lime and back, be characterized in: the tawny oxidized sludge volume of water content after the filtration is 50%-85%.
The treatment process of the yellow mud in the described steel pickling waste liquor lime and back, be characterized in: be incubated after 25-50 minute, the mud color is black, and iron level reaches at 50% o'clock, adding when filtering again pH value be that the sewage of 4.5-5.5 is in heating bath.
The treatment process of the yellow mud in the described steel pickling waste liquor lime and back is characterized in: after regulating pH value and be 10.5-11.5 with liquor calcis, treat to stop aeration agitation when mud is stirred to the pasty state of thickness with air aeration, heat with steam then.
The treatment process of the yellow mud in the described steel pickling waste liquor lime and back, be characterized in: after reaction finishes, utilize pH value after filtration to cool off in heating bath for the sewage of 4.5-5.5, open the air aeration valve simultaneously heating bath is carried out the aeration cooling, squeeze into plate-and-frame filter press with surge pump when being cooled to 45-55 ℃ and carry out press filtration, filter cake obtains black magnetic Z 250 mud.
The treatment process of the yellow mud in the described steel pickling waste liquor lime and back, be characterized in: filter cake obtains the black magnetic Z 250 mud that iron level is 50%-60%.
Advantage and positively effect that the present invention has are:
The treatment process of the yellow mud in the steel pickling waste liquor lime and back is owing to adopted brand-new technology scheme of the present invention, compared with prior art, it is simple that the treatment process of the yellow mud in the steel pickling waste liquor lime and back has technology, easy to operate, control is easy, stable performance, process is reliable, the processing efficiency height has reached the pollution that the purpose that turns waste into wealth has been avoided environment, source of pollution has been become advantages such as renewable resource.
Description of drawings
Fig. 1 is in the steel pickling waste liquor lime of the present invention and the treatment process process flow sheet of the yellow mud in back;
Fig. 2 is process innovation part process flow sheet of the present invention.
Embodiment
For further understanding technology contents of the present invention, characteristics and effect, exemplify following examples now, and be described with reference to the accompanying drawings as follows:
Consult accompanying drawing 1 and Fig. 2.
Embodiment 1
The treatment process of the yellow mud in the steel pickling waste liquor lime and back, the Fe-laden acid wastewater in pickling workshop is squeezed in the reaction tank with acid proof pump, adds lime and makes its acid-base neutralisation, through aeration, accent PH, filtration treatment.The Fe-laden acid wastewater pH value of regulating the pickling workshop with filter cake is 4.5-5.5, aeration oxidation and then filtration; Filtration back water-content is that the tawny oxidized sludge of 50%-85% is transported in the heating bath, carry out the aeration agitation oxidation, regulating pH value with liquor calcis is 10.5-11.5, treat that mud stops aeration agitation when being stirred to the pasty state of thickness with air aeration, heat to 100-130 ℃ of mud temperature with steam then, be incubated 25-50 minute; The mud color is black, and ferrous components content reaches at 50% o'clock, adds that to filter pH value again be that the sewage of 4.5-5.5 cools off in heating bath, regulates pH value simultaneously and equals 6.5-7.5, and reaction finishes; Open the air aeration valve heating bath is carried out the aeration cooling, squeeze into plate-and-frame filter press with surge pump when being cooled to 45-55 ℃ and carry out press filtration, filter cake obtains the black magnetic Z 250 mud that iron level is 50%-60%.
The concrete operations implementation process of present embodiment:
The treatment process of the yellow mud in the steel pickling waste liquor lime and back, to be lower than 2 Fe-laden acid wastewater from pickling workshop pH value and squeeze in the reaction tank with acid proof pump, and add lime and make its acid-base neutralisation, stir carrying out the aeration oxidation in the reaction tank simultaneously, regulate pH value=8, aeration oxidation 1 hour.Sewage after will neutralizing then filters with filter, tawny oxidized sludge after the filtration is put in the reaction tank with pump again, adding is lower than 2 iron content sour water from pickling workshop pH value, regulate pH value and equal 5, aeration oxidation and then filtration, filtered sewage turn back to reaction tank and wait for next step processing.
Tawny oxidized sludge after the filtration (filter cake is put in the heating bath also will (to contain crystal water 60%) after the available pressure filter press filtration) joins in the heating bath with sludge pump, concentration according to the tawny oxidized sludge adds through filtering the iron waste water that contains that the back pH value equals 5 last time in heating bath, open air aeration heating bath is stirred oxidation, the PH that regulates in the heating bath with lime liquid equals 12 again, treat that mud stops aeration agitation when being stirred to the pasty state of thickness with air aeration, the unlatching steam valve is heated, when the mud temperature reaches 100 ℃, close most of steam and keep micro-steam by carrying out insulation reaction 30 minutes, observing the mud color is that chocolate can not appear in pure black, and detection mud iron-holder reaches 50% and is reaction end.The steam off valve stops heating, with water pump PH in the reaction tank is equaled 5 the iron waste water that contains and joins to cool off in the heating bath and regulate pH value simultaneously and equal reaction in 7 o'clock and finish.Open the air aeration valve heating bath is carried out the aeration cooling, when being cooled to 50 ℃, squeeze into plate-and-frame filter press with surge pump and carry out press filtration, water discharging filter cake after the press filtration obtains the iron mud of iron content 50%, the raw material that is used for smelting iron and steel, stopped yellow mud after the sewage disposal to the pollution of environment and be recovered to the higher-grade iron containing sludge, source of pollution have been become renewable resource.
Embodiment 2
The treatment process of the yellow mud in the steel pickling waste liquor lime and back, technological process is with embodiment 1, wherein, the pickling mud of moisture 85% after 10 cubes of filtrations is joined in the heating bath with sludge pump, adjust pH value with liquor calcis and equal 12, open steam valve the mud in the heating bath is heated 2.5 hours vapor pressure 0.2 MPas, when the mud temperature reaches more than 100 ℃, the steam off valve adds the iron waste water that contains of PH=5 again in the heating bath, regulates PH=7 in the heating bath.The sewage gas that to heat in the pond with the air stripping tube is mentioned the mud storage pool then, joins with pneumatic diaphragm pump and carries out press filtration in the plate-and-frame filter press.Sewage discharge after the press filtration, filter cake obtains the magnetic ferroferric oxide mud of 2 cubes of black moisture 60% after the press filtration.
Present embodiment has described positively effect and advantage.
Claims (6)
- In the steel pickling waste liquor lime and the back yellow mud treatment process, the Fe-laden acid wastewater in pickling workshop is squeezed in the reaction tank with acid proof pump, add lime and make its acid-base neutralisation, through aeration, accent PH, filtration treatment, it is characterized in that: the Fe-laden acid wastewater pH value of regulating the pickling workshop with yellow mud is 4.5-5.5, aeration oxidation and then filtration; Tawny oxidized sludge after the filtration is transported in the heating bath, add the iron waste water that contains that filtration back pH value equals 5 in heating bath, carry out the aeration agitation oxidation, regulating pH value with liquor calcis is 10.5-11.5, heat to 100-130 ℃ of mud temperature with steam then, be incubated 25-50 minute; The adding pH value is that the iron content sewage of 4.5-5.5 cools off in heating bath, regulates the pH value and equals 6.5-7.5, and reaction finishes; Be cooled to 45-55 ℃, filter and obtain the black magnetic iron containing sludge.
- 2. according to the treatment process of the yellow mud in the described steel pickling waste liquor lime of claim 1 and back, it is characterized in that: the tawny oxidized sludge volume of water content after the filtration is 50%-85%.
- According in the described steel pickling waste liquor lime of claim 1 and the back yellow mud treatment process, it is characterized in that: be incubated after 25-50 minute, the mud color is black, and iron level reaches at 50% o'clock, and the sewage that adds pH value when filtering again and be 4.5-5.5 carries out hypothermic response in heating bath.
- According in claim 1, the 2 or 3 described steel pickling waste liquor lime and the back yellow mud treatment process, it is characterized in that: after being 10.5-11.5 with liquor calcis adjusting pH value, treat to stop aeration agitation when mud is stirred to the pasty state of thickness with air aeration, heat with steam then.
- According in claim 1, the 2 or 3 described steel pickling waste liquor lime and the back yellow mud treatment process, it is characterized in that: after reaction finishes, be that the iron content sewage of 4.5-5.5 is lowered the temperature with pH value in the heating bath, open the air aeration valve simultaneously heating bath is carried out the aeration cooling, squeeze into plate-and-frame filter press with surge pump when being cooled to 45-55 ℃ and carry out press filtration, filter cake obtains black magnetic Z 250 mud.
- 6. according to the treatment process of the yellow mud in the described steel pickling waste liquor lime of claim 5 and back, it is characterized in that: filter cake obtains the black magnetic Z 250 mud that iron level is 50%-60%.
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| CN 201110446622 CN102653437B (en) | 2011-09-20 | 2011-12-28 | Method for treating yellow sludge obtained in neutralization of steel pickling waste water lime |
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| CN201110278314.4 | 2011-09-20 | ||
| CN2011102783144A CN102358648A (en) | 2011-09-20 | 2011-09-20 | Technology for recycling of sludge obtained after neutralizing treatment of steel and iron pickling wastewater and recycling ferroferric oxide |
| CN 201110446622 CN102653437B (en) | 2011-09-20 | 2011-12-28 | Method for treating yellow sludge obtained in neutralization of steel pickling waste water lime |
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| CN 201110446622 Active CN102653437B (en) | 2011-09-20 | 2011-12-28 | Method for treating yellow sludge obtained in neutralization of steel pickling waste water lime |
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| CN103553258B (en) * | 2013-11-13 | 2014-08-06 | 卢玉柱 | Safe recycling treatment method of waste iron/steel pickling acid |
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| CN103964660B (en) * | 2014-05-20 | 2016-01-06 | 钱占虎 | The acid wastewater treatment of acid-base neutralisation precipitator method process iron content produces the recovery process of mud |
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| CN105906174A (en) * | 2016-05-04 | 2016-08-31 | 卢玉柱 | Method for ferric hydroxide water purifier preparation with sludge after steel pickling waste water lime neutralization |
| CN106379976A (en) * | 2016-08-30 | 2017-02-08 | 无锡市新都环保科技有限公司 | Equipment and method for preparing water treatment agent through using acidic iron-containing wastewater |
| CN107200447A (en) * | 2017-06-20 | 2017-09-26 | 天津丰源首创环保科技有限公司 | A kind of pickling iron and steel sludge quickly improves the resource utilization method after iron-holder |
| GB2578645B (en) * | 2018-11-02 | 2021-11-24 | Darlow Lloyd & Sons Ltd | Method and apparatus for treating waste material |
| CN109399887A (en) * | 2018-12-07 | 2019-03-01 | 中国矿业大学(北京) | A kind of steel rolling pickling waste water sludge recycling processing method |
| CN112573580A (en) * | 2020-10-12 | 2021-03-30 | 江苏荣信环保科技有限公司 | Recovery treatment process of ferric trichloride sludge on surface of metal product |
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