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 is easy, stable performance; Process is reliable; Processing efficiency is high, 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 the treatment process with the yellow mud in back.
The present invention is on the basis of the original WWT 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, it is simple, easy to operate to reclaim technology; Environment is not produced pollution; On environment protection treating, realized recycling economy, 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; 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 with pump once more, 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 will (to contain crystal water 60%) after the also available pressure filter press filtration) joins in the heating bath with steam piano; In heating bath, add in the reaction tank iron waste water that contains that pH value after filtering equals 5 according to the concentration of tawny oxidized sludge; Open air aeration heating bath is carried out the oxidation stirring; Equal 12 with the PH in the lime liquid adjusting heating bath again and treat that mud stops aeration agitation when being stirred to the heavy-gravity pasty state with air aeration; The unlatching steam valve is heated; Close most of steam when spending and keep micro-steam through 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, detects iron-holder and reaches 50% and be 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 of taking for the problem that solves the prior art existence with the treatment process of the yellow mud in back in the steel pickling waste liquor lime of the present invention 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; Add lime and make its acid-base neutralisation; Through aeration, accent PH, filtration treatment, be characterized in: the Fe-laden acid wastewater pH value that uses yellow mud to regulate the pickling workshop 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, uses liquor calcis to regulate pH value and is 10.5-11.5, heats to 100-130 ℃ of mud temperature with steam then, is incubated 25-50 minute; Adding warp filtration pH value is that the sewage of 4.5-5.5 cools off in heating bath, regulates pH value and equals 6.5-7.5, the reaction end; Be cooled to 45-55 ℃, filter and obtain the black magnetic iron containing sludge.
Treatment process with the yellow mud in back in the steel pickling waste liquor lime of the present invention 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%.
With the treatment process of the yellow mud in back, be characterized in: be incubated after 25-50 minute, the mud color is a black, and iron level reaches at 50% o'clock in the described steel pickling waste liquor lime, adding when filtering once more 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 using liquor calcis adjusting pH value as 10.5-11.5, treat to stop aeration agitation when mud is stirred to the heavy-gravity pasty state 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 through the sewage of filtration pH value and in heating bath, cool off for 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, and 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; Processing efficiency is high, 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.
Embodiment
For further understanding technology contents of the present invention, characteristics and effect, the following examples of giving an example 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, adds lime and makes its acid-base neutralisation, through aeration, accent PH, filtration treatment.The Fe-laden acid wastewater pH value that uses filter cake to regulate the pickling workshop 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; Use liquor calcis to regulate pH value and be 10.5-11.5; Treat that mud stops aeration agitation when being stirred to the heavy-gravity pasty state with air aeration, heat to 100-130 ℃ of mud temperature with steam then, be incubated 25-50 minute; The mud color is a black, and iron content reaches at 50% o'clock, adds that to filter pH value once more 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, and add lime and make its acid-base neutralisation, stir carrying out the aeration oxidation in the reaction tank simultaneously with acid; 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 once more; 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 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 will (to contain crystal water 60%) after the also available pressure filter press filtration) joins in the heating bath with sludge pump; Concentration according to the tawny oxidized sludge adds in heating bath through filtering the iron waste water that contains that the back pH value equals 5 last time; Open air aeration heating bath is stirred oxidation; The PH that regulates in the heating bath with lime liquid again equals 12; Treat that mud stops aeration agitation when being stirred to the heavy-gravity pasty state with air aeration, open steam valve and heat, when the mud temperature reaches 100 ℃, close most of steam and keep micro-steam through 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, the water discharging filter cake after the press filtration obtains the iron mud of iron content 50%, is used for the raw material of smelting iron and steel; Stopped yellow mud after the WWT 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, equal 12, open steam valve the mud in the heating bath is heated 2.5 hours vapor pressure 0.2 MPas with liquor calcis adjustment pH value; When the mud temperature reaches more than 100 ℃; The steam off valve adds the iron waste water that contains of PH=5 again in heating bath, regulate PH=7 in the heating bath.The sewage gas that to heat in the pond with the air stripping tube is then mentioned the mud storage pool, 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.