CN106830418A - A kind of method that utilization calcium carbide waste residue treatment passivation for stainless steel cleans waste water - Google Patents
A kind of method that utilization calcium carbide waste residue treatment passivation for stainless steel cleans waste water Download PDFInfo
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- CN106830418A CN106830418A CN201710037637.1A CN201710037637A CN106830418A CN 106830418 A CN106830418 A CN 106830418A CN 201710037637 A CN201710037637 A CN 201710037637A CN 106830418 A CN106830418 A CN 106830418A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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Abstract
The invention discloses a kind of method that utilization calcium carbide waste residue treatment passivation for stainless steel cleans waste water, passivation for stainless steel cleaning waste water is transferred into neutralization chamber carries out alkali adjustment, is then transferred in depositing reservoir, adds PAMC, generation precipitate metal hydroxides, obtain clarifying waste liquid；Allotment calcium carbide waste slag suspension；Clarification waste liquid after separation is transferred in fluorination reaction pond, after adding hydrochloric acid solution, calcium carbide waste slag suspension and aluminium polychloride is added, and mixed liquor is flowed into sedimentation basin, make fluorine ion with calcium ion to symphysis into CaF2Precipitate and remove；CaF will be removed2The exhausted water of precipitation is flowed into final neutralization chamber, and neutralizer is added in final neutralization chamber, is disposed waste liquid, and is then discharged through sand filter.The present invention replaces lime that the treatment of waste water is cleaned for passivation for stainless steel using calcium carbide waste slag, and with low cost, advantage easy to use plays a part of " treatment of wastes with processes of wastes against one another ", environmental benefit and remarkable in economical benefits.
Description
Technical field
The present invention relates to the process field of waste water, and in particular to one kind is useless using the cleaning of calcium carbide waste residue treatment passivation for stainless steel
The method of water.
Background technology
Stainless steel has the mechanical property such as excellent corrosion resistance, heat resistance, mechanical strength, wearability, formability, compatibility
Energy and chemical property, and its exquisite appearance, light weight, in industries such as oil, chemical industry, machinery, shipbuilding, nuclear power, military project, buildings
Middle acquisition extensive use.Stainless steel in process of production, be by process, surface meeting such as annealing, normalizing, quenching, welding
Form one layer of thin and compact oxide-film, substantial amounts of chromium oxide, nickel oxide contained in its main component, can to the outward appearance of product and
Following process has a negative impact, therefore must be removed using surface treatment methods such as pickling, passivation, polishings before following process
Go.
Method for treating stainless steel surfaces is because chromium oxide is insoluble in single acid therefore usually used based on pickling
Nitric acid, sulfuric acid and hydrofluoric acid mixed acid carry out acid cleaning process, in the process, generate and largely contain F-、Cr3+、Fe3+、Fe2+
And Ni2+Pickling waste waters.Conventional method, as nertralizer, makes the heavy metal ion in waste water be transformed into insoluble gold using lime
Category hydroxide precipitation.Have at present and developed a kind of sludge segmentation being improved on the basis of traditional neutralisation, sub-prime neutralization
New technology.New technology is divided into two sections, lime is substituted as nertralizer with liquid caustic soda (NaOH) first, by the heavy metal ion in waste water
It is transformed into insoluble hydroxide, while addition flocculant precipitates it, so as to the iron that obtained of first paragraph, chromium, nickel can be sunk
Starch is separated and recovered by chemical method, or carries out secondary utilization during sediment is backed into metal smelt.Second segment is then
Calcium hydroxide milk of lime fluorine removal is added, the precipitation of calcirm-fluoride and calcium sulfate is obtained, and carries out other treatment.But in this process
In, because solubility of the calcium hydroxide in water is limited, and lime particle is thicker, therefore neutralization reaction speed is slower, and easily
Lime particle centre portion is caused not participate in reaction and increase lime consumption, as a result causing largely to transport outward sludge to be processed.
When calcium carbide waste slag is using carbide manufacture polyvinyl chloride, vinyl acetate, by calcium carbide and water reaction generation ethene mistake
The pH particulates precipitate waste material high produced in journey.It contains Ca (OH)2Mass fraction be up to 90% or so, pH 12~14 with
On, belong to II class industrial solid wastes.Often 1 ton of polyvinyl chloride of production will discharge calcium carbide waste slag more than 2 tons.The place of past calcium carbide waste slag
Reason mode is mainly based on use burying method.But long-term landfill not only needs to take substantial amounts of land resource, is also easy to cause
Secondary pollution.Because calcium carbide waste slag particle is fine and smooth, acinous waste residue and some organic solid castoffs are in suitable temperature and wet
It is decomposed by the microorganisms under degree, pernicious gas and dust can be discharged, elegant with the wind can be diffused into far place, produces gray haze day
Gas, causes the dust pollution of air.Being reused for current calcium carbide waste slag be mainly used to instead of lime cement made of stones, production life
Lime with etc., but control with China's capital construction scale and to highly energy-consuming, the limitation of high pollution industry, the product of market cement
Amount is seriously superfluous, and many cement production enterprises replace lime cement made of stones with calcium carbide waste slag all in the state paused and get down from horse
Channel cannot carry out, it is therefore necessary to for calcium carbide waste slag is sought effectively to process approach.
Chinese patent CN201010294039.0 discloses a kind of method of stainless steel acid cleaning waste water treatment and reuse, nitration mixture
Waste water flows into one-level neutralization chamber, with regulation pH to 4.0~5.0 in feeding lime, is flowed into through the waste water in one-level neutralization chamber with after
Two grades of neutralization chambers, add liquid caustic soda neutralization, and regulation pH value is 8.2~8.7, and adding flocculant carries out coagulating, through coagulating
Waste water afterwards flows into sedimentation basin and carries out mud-water separation, sludge routinely waste outward transport treatment.But the wastewater treatment mistake of the patent
Largely used lime in journey, although lime it is cheap, but its solubility is low, can only be added with emulsion, and lime
Particle is thicker, and neutralization reaction speed is slower, easily causes lime particle centre portion and does not participate in reaction and increase lime consumption, while
The CaF that fluorine ion is generated with calcium ion reaction2Calcium hydroxide particle surface can be wrapped in, be also allowed to be fully utilized, therefore
Need to increase milk of lime in operation and obtain dosage, accordingly even when when pH value of waste water reaches 12, can only also make to be incited somebody to action under fluorinion concentration
15mg/L or so is arrived, cost is so first increased, the deposition of sludge is second increased.
Therefore, with reference to calcium carbide waste slag amount it is big, calcium content is high the advantages of, for lime stone treatment passivation for stainless steel cleaning waste water
During produce reaction rate is slow, the problem that limestone utilization is low, amount of by-products is big, it is desirable to provide one kind solves useless
Water treatment procedure environmental pollution and the method for product efficiency problem, effectively to solve the secondary recycling of solid waste.
The content of the invention
The present invention is regarding to the issue above, there is provided a kind of method that utilization calcium carbide waste residue treatment passivation for stainless steel cleans waste water.
The present invention the used technical scheme that solves the above problems is：One kind is useless using the cleaning of calcium carbide waste slag passivation for stainless steel
The method of water, comprises the following steps：
Step S1, wastewater equalization pond is imported by passivation for stainless steel cleaning waste water, then is transferred to neutralization chamber, is existed by measuring pump
Liquid caustic soda is added in neutralization chamber, the pH value for making passivation for stainless steel clean waste water is adjusted to 8.5~9.5, obtain stainless after alkali adjustment
Steel passivation cleaning waste water；
Step S2, the passivation for stainless steel cleaning waste water after the alkali adjustment that step S1 is obtained is flowed into depositing reservoir, is passed through
Measuring pump adds PAMC, the Fe in passivation for stainless steel cleaning waste water after adjusting alkali3+、Cr3+、Ni2+With
Mn4+Generation Fe (OH) respectively3、Cr(OH)3、Ni(OH)2With Mn (OH)4Precipitate and be separated from the water out, obtain clarifying waste liquid；
Step S3, calcium carbide waste slag is added water and is deployed into the calcium carbide waste slag suspension of 15wt%~30wt%；
Step S4, the clarification waste liquid after the separation that step S2 is obtained is transferred in fluorination reaction pond, pneumatic by controlling
It is the hydrochloric acid solution of 10wt%~15wt% that the aperture of valve and switch add concentration, adds the calcium carbide waste slag that step S3 obtains and hangs
Supernatant liquid, then adds aluminium polychloride by measuring pump, and mixed liquor is flowed into sedimentation basin, make fluorine ion and calcium ion to
Symphysis is into CaF2Precipitate and remove；
Step S5, will remove CaF in step S42The exhausted water of precipitation is flowed into final neutralization chamber, in final neutralization chamber
Middle addition neutralizer, is disposed waste liquid；The pH for disposing waste liquid is adjusted to 6.8~7.2, then discharged through sand filter, i.e., it is complete
The treatment of waste water is cleaned into passivation for stainless steel.
Now lime is compareed with the composition of calcium carbide waste slag：
The chemical component table of lime and calcium carbide waste slag
Control can be seen that more than, and quite, calcium carbide waste slag main component is also Ca (OH) to both calcium contents2, in highly basic
Property, therefore can be used as the treatment that passivation for stainless steel cleans waste water instead of lime using this chemical property completely.And niter
The preparation of ash is generally obtained using the method for calcined limestone, and broken relatively rough before its calcining, particle is larger, it is impossible to complete
It is complete to participate in reaction.And carbide slag is the precipitated product after calcium carbide hydrolysis acquisition acetylene gas, due to being acted on by chemical dispersion, its
Grain is tiny, and specific surface area area is big, therefore reaction efficiency is high, and consumption is few, and also contains aluminium ion higher in calcium carbide waste slag,
With a certain amount of iron ion, its hydroxide has certain flocculation, can accelerate the precipitation of suspension.Therefore given up using calcium carbide
Slag replaces lime that the treatment of waste water is cleaned for passivation for stainless steel, with low cost, the features such as easy to use, can not only save
Cost for wastewater treatment, and calcium carbide waste slag is comprehensively utilized, reach the purpose of " treatment of wastes with processes of wastes against one another ", environmental benefit and economy
Remarkable benefit.
Further, in step S2, the addition of PAMC is the passivation for stainless steel cleaning after alkali adjustment
The 0.003 ‰ of wastewater quality~0.005 ‰.
Further, in step S2, Fe (OH)3、Cr(OH)3、Ni(OH)2With Mn (OH)4Precipitation is entered in being transferred to concentration basin
Row concentration, then makees resource reclaim treatment by concentrate after plate and frame filter press is extruded.
Further, the concentrate through extruding is used as the raw materials for metallurgy of stainless steel.
Further, in step S3, the composition of calcium carbide waste slag includes：Ca(OH)2。
Further, Ca (OH)2Quality account for more than the 90% of calcium carbide waste slag quality.
Further, in step S4, be adjusted to for pH of mixed by hydrochloric acid solution：5~6.
Further, in step S4, the addition of calcium carbide waste slag is 1.1~1.4 times of calcium theoretical value.Wherein, calcium carbide waste slag
It is the effective solid constituent in calcium carbide waste slag suspension in step S4.
Further, in step S4, the addition of aluminium polychloride be the clarification waste liquid quality after separating 0.2%~
0.6%.
Further, in step S4, CaF2Precipitate the raw material for being used as sintered building haydite after being concentrated through filter press.
Further, in step S5, neutralizer is：Any one or two kinds of in NaOH solution, HCl solution.
It is an advantage of the invention that：
1. the present invention replaces lime that the treatment of waste water is cleaned for passivation for stainless steel using calcium carbide waste slag, with low cost,
Advantage easy to use, plays a part of " treatment of wastes with processes of wastes against one another ", environmental benefit and remarkable in economical benefits；Wherein, calcium carbide waste slag is main
Composition is Ca (OH)2, in strong basicity, and mode of appearance is superfine powder, may be used to replace lime to be cleaned as passivation for stainless steel
The treatment of waste water, and also contain aluminium ion and a certain amount of iron ion higher in calcium carbide waste slag, its hydroxide has wadding
The characteristics of solidifying effect, flocculation sediment effect can be played；
2. the present invention carries out secondary recycling to calcium carbide waste slag, solves that calcium carbide waste slag floor space is big, can cause dust
The problem of pollution, is a kind for the treatment of approach of environment-friendly high-efficiency；
3. the present invention cleans wastewater treatment for passivation for stainless steel, and passivation for stainless steel is cleaned into heavy metal pollution in wastewater thing
Effectively removed with fluorine contaminant, and the hydroxide precipitate for obtaining can be obtained as the raw materials for metallurgy of stainless steel
Calcium fluoride precipitate can reach the purpose of " treatment of wastes with processes of wastes against one another ", environmental benefit and economy as the raw material of sintered building haydite
Remarkable benefit；
4. the processing method using calcium carbide waste slag passivation for stainless steel cleaning waste water of the invention is easy to operate, produce efficient, and
And energy-conserving and environment-protective.
Specific embodiment
Embodiments of the invention are described in detail below, but the present invention can be defined by the claims and cover
Multitude of different ways is implemented.
Embodiment 1
A kind of method that utilization calcium carbide waste residue treatment passivation for stainless steel cleans waste water, comprises the following steps：
Step S1, wastewater equalization pond is imported by passivation for stainless steel cleaning waste water, then is transferred to neutralization chamber, is existed by measuring pump
Liquid caustic soda is added in neutralization chamber, the pH value for making passivation for stainless steel clean waste water is adjusted to 8.5, obtains the passivation for stainless steel after alkali adjustment
Cleaning waste water；
Step S2, the passivation for stainless steel cleaning waste water after the alkali adjustment that step S1 is obtained is flowed into depositing reservoir, is passed through
Measuring pump adds the passivation for stainless steel after alkali adjustment to clean the PAMC of wastewater quality 0.003 ‰, adjusts alkali
The Fe in passivation for stainless steel cleaning waste water afterwards3+、Cr3+、Ni2+And Mn4+Generation Fe (OH) respectively3、Cr(OH)3、Ni(OH)2And Mn
(OH)4Precipitate and be separated from the water out, obtain clarifying waste liquid；Fe(OH)3、Cr(OH)3、Ni(OH)2With Mn (OH)4Precipitation transfer
Concentrated into concentration basin, concentrate is then made into resource reclaim treatment after plate and frame filter press is extruded；Through extruding
Concentrate is used as the raw materials for metallurgy of stainless steel；
Step S3, calcium carbide waste slag is added water and is deployed into the calcium carbide waste slag suspension of 15wt%；The composition of calcium carbide waste slag includes
Ca(OH)2；Ca(OH)2Quality account for the 90% of calcium carbide waste slag quality；
Step S4, the clarification waste liquid after the separation that step S2 is obtained is transferred in fluorination reaction pond, pneumatic by controlling
After the aperture and switch of valve add concentration for the hydrochloric acid solution of 10wt%, the calcium carbide waste slag suspension that step S3 is obtained is added,
Then the aluminium polychloride of 0.2% of the clarification waste liquid quality after separating is added by measuring pump, mixed liquor, hydrochloric acid solution is obtained
PH of mixed is adjusted to 5.0, mixed liquor is flowed into inclined-plate clarifying basin, make fluorine ion with calcium ion to symphysis into CaF2It is heavy
Form sediment and remove；CaF2Precipitate the raw material for being used as sintered building haydite after being concentrated through filter press；The addition of calcium carbide waste slag is managed for calcium
By the 1.1 of value；
Step S5, will remove CaF in step S42The exhausted water of precipitation is flowed into final neutralization chamber, in final neutralization chamber
Middle addition NaOH neutralizers, are disposed waste liquid；The pH for disposing waste liquid is adjusted to 7.2, then discharged through sand filter, that is, complete
Passivation for stainless steel cleans the treatment of waste water.
Embodiment 2
A kind of method that utilization calcium carbide waste residue treatment passivation for stainless steel cleans waste water, comprises the following steps：
Step S1, wastewater equalization pond is imported by passivation for stainless steel cleaning waste water, then is transferred to neutralization chamber, is existed by measuring pump
Liquid caustic soda is added in neutralization chamber, the pH value for making passivation for stainless steel clean waste water is adjusted to 9.5, obtains the passivation for stainless steel after alkali adjustment
Cleaning waste water；
Step S2, the passivation for stainless steel cleaning waste water after the alkali adjustment that step S1 is obtained is flowed into depositing reservoir, is passed through
Measuring pump adds the passivation for stainless steel after alkali adjustment to clean the PAMC of wastewater quality 0.005 ‰, adjusts alkali
The Fe in passivation for stainless steel cleaning waste water afterwards3+、Cr3+、Ni2+And Mn4+Generation Fe (OH) respectively3、Cr(OH)3、Ni(OH)2And Mn
(OH)4Precipitate and be separated from the water out, obtain clarifying waste liquid；Fe(OH)3、Cr(OH)3、Ni(OH)2With Mn (OH)4Precipitation transfer
Concentrated into concentration basin, concentrate is then made into resource reclaim treatment after plate and frame filter press is extruded；Through being squeezed into
The concentrate of type is used as the raw materials for metallurgy of stainless steel；
Step S3, calcium carbide waste slag is added water and is deployed into the calcium carbide waste slag suspension of 30wt%；The composition of calcium carbide waste slag includes：
Ca(OH)2；Ca(OH)2Quality account for the 93% of calcium carbide waste slag quality；
Step S4, the clarification waste liquid after the separation that step S2 is obtained is transferred in fluorination reaction pond, pneumatic by controlling
After the aperture and switch of valve add concentration for the hydrochloric acid solution of 15wt%, the calcium carbide waste slag suspension that step S3 is obtained is added,
Then the aluminium polychloride of 0.6% of the clarification waste liquid quality after separating is added by measuring pump, mixed liquor, hydrochloric acid solution is obtained
PH of mixed is adjusted to 5.5, and mixed liquor is flowed into inclined-plate clarifying basin, make fluorine ion with calcium ion to symphysis into CaF2
Precipitate and remove；CaF2Precipitate the raw material for being used as sintered building haydite after being concentrated through filter press；The addition of calcium carbide waste slag is calcium
The 1.2 of theoretical value；
Step S5, will remove CaF in step S42The exhausted water of precipitation is flowed into final neutralization chamber, in final neutralization chamber
Middle addition HCl neutralizers, are disposed waste liquid；The pH for disposing waste liquid is adjusted to 6.8, then discharged through sand filter, that is, complete
Passivation for stainless steel cleans the treatment of waste water.
Embodiment 3
A kind of method that utilization calcium carbide waste residue treatment passivation for stainless steel cleans waste water, comprises the following steps：
Step S1, wastewater equalization pond is imported by passivation for stainless steel cleaning waste water, then is transferred to neutralization chamber, is existed by measuring pump
Liquid caustic soda is added in neutralization chamber, the pH value for making passivation for stainless steel clean waste water is adjusted to 9, and the passivation for stainless steel obtained after alkali adjustment is clear
Wash waste water；
Step S2, the passivation for stainless steel cleaning waste water after the alkali adjustment that step S1 is obtained is flowed into depositing reservoir, is passed through
Measuring pump adds the passivation for stainless steel after alkali adjustment to clean the PAMC of wastewater quality 0.004 ‰, adjusts alkali
The Fe in passivation for stainless steel cleaning waste water afterwards3+、Cr3+、Ni2+And Mn4+Generation Fe (OH) respectively3、Cr(OH)3、Ni(OH)2And Mn
(OH)4Precipitate and be separated from the water out, obtain clarifying waste liquid；Fe(OH)3、Cr(OH)3、Ni(OH)2With Mn (OH)4Precipitation transfer
Concentrated into concentration basin, concentrate is then made into resource reclaim treatment after plate and frame filter press is extruded；Through extruding
Concentrate is used as the raw materials for metallurgy of stainless steel；
Step S3, calcium carbide waste slag is added water and is deployed into the calcium carbide waste slag suspension of 22wt%；The composition of calcium carbide waste slag includes
Ca(OH)2；Ca(OH)2Quality account for the 94% of calcium carbide waste slag quality；
Step S4, the clarification waste liquid after the separation that step S2 is obtained is transferred in fluorination reaction pond, pneumatic by controlling
After the aperture and switch of valve add concentration for the hydrochloric acid solution of 13wt%, the calcium carbide waste slag suspension that step S3 is obtained is added,
Then the aluminium polychloride of 0.4% of the clarification waste liquid quality after separating is added by measuring pump, mixed liquor, hydrochloric acid solution is obtained
PH of mixed is adjusted to 6.0, and mixed liquor is flowed into inclined-plate clarifying basin, make fluorine ion with calcium ion to symphysis into CaF2
Precipitate and remove；CaF2Precipitate the raw material for being used as sintered building haydite after being concentrated through filter press；The addition of calcium carbide waste slag is calcium
The 1.3 of theoretical value；
Step S5, will remove CaF in step S42The exhausted water of precipitation is flowed into final neutralization chamber, in final neutralization chamber
It is middle to add NaOH solution and HCl solution neutralizer, disposed waste liquid；The pH for disposing waste liquid is set to be adjusted to 7.0, then through sand filtration
Device is discharged, that is, complete the treatment that passivation for stainless steel cleans waste water.
Embodiment 4
A kind of method that utilization calcium carbide waste residue treatment passivation for stainless steel cleans waste water, comprises the following steps：
Step S1, wastewater equalization pond is imported by passivation for stainless steel cleaning waste water, then is transferred to neutralization chamber, is existed by measuring pump
Liquid caustic soda is added in neutralization chamber, the pH value for making passivation for stainless steel clean waste water is adjusted to 8.3, obtains the passivation for stainless steel after alkali adjustment
Cleaning waste water；
Step S2, the passivation for stainless steel cleaning waste water after the alkali adjustment that step S1 is obtained is flowed into depositing reservoir, is passed through
Measuring pump adds the passivation for stainless steel after alkali adjustment to clean the PAMC of wastewater quality 0.0035 ‰, adjusts alkali
The Fe in passivation for stainless steel cleaning waste water afterwards3+、Cr3+、Ni2+And Mn4+Generation Fe (OH) respectively3、Cr(OH)3、Ni(OH)2And Mn
(OH)4Precipitate and be separated from the water out, obtain clarifying waste liquid；Fe(OH)3、Cr(OH)3、Ni(OH)2With Mn (OH)4Precipitation transfer
Concentrated into concentration basin, concentrate is then made into resource reclaim treatment after plate and frame filter press is extruded；Through extruding
Concentrate is used as the raw materials for metallurgy of stainless steel；
Step S3, calcium carbide waste slag is added water and is deployed into the calcium carbide waste slag suspension of 25wt%；The composition of calcium carbide waste slag includes
Ca(OH)2；Ca(OH)2Quality account for the 95% of calcium carbide waste slag quality；
Step S4, the clarification waste liquid after the separation that step S2 is obtained is transferred in fluorination reaction pond, pneumatic by controlling
After the aperture and switch of valve add concentration for the hydrochloric acid solution of 12wt%, the calcium carbide waste slag suspension that step S3 is obtained is added,
Then the aluminium polychloride of 0.35% of the clarification waste liquid quality after separating is added by measuring pump, mixed liquor is obtained, hydrochloric acid is molten
PH of mixed is adjusted to 5.7 by liquid, and mixed liquor is flowed into inclined-plate clarifying basin, make fluorine ion and calcium ion to symphysis into
CaF2Precipitate and remove；CaF2Precipitate the raw material for being used as sintered building haydite after being concentrated through filter press；The addition of calcium carbide waste slag is
The 1.4 of calcium theoretical value；
Step S5, will remove CaF in step S42The exhausted water of precipitation is flowed into final neutralization chamber, in final neutralization chamber
Middle addition NaOH solution neutralizer, is disposed waste liquid；The pH for disposing waste liquid is adjusted to 7.1, then discharged through sand filter, i.e.,
Complete the treatment that passivation for stainless steel cleans waste water.
Experimental example 1
To using the processing method of embodiment 1~4, the waste liquid discharged through sand filter is labeled as 1~sample of sample 4, to sample 1
The water quality of~sample 4 is detected that testing result is as shown in table 1.Examination criteria presses GB8978-1996.
Waste liquid water quality detection result of the table 1 through processing
As a result：It is total cadmium of the waste liquid discharged through sand filter, total chromium, Cr VI, total using the processing method of embodiment 1~4
Nickel, suspension, five-day BOD, COD, fluoride, total content of organic carbon meet GB8978-1996 detections
Standard, and it is in suitable low content.
Conclusion：The advantages of the application combination calcium carbide waste slag amount is big, calcium content is high, it is clear for lime stone treatment passivation for stainless steel
Wash that the reaction rate produced during waste water is slow, the problem that limestone utilization is low, amount of by-products is big, there is provided one kind solution
Certainly the method for wastewater treatment process environmental pollution and product efficiency problem, efficiently solves the secondary recycling of solid waste.
The preferred embodiments of the present invention are these are only, is not intended to limit the invention, for those skilled in the art
For member, the present invention can have various modifications and variations.All any modifications within the spirit and principles in the present invention, made,
Equivalent, improvement etc., should be included within the scope of the present invention.
Claims (11)
1. a kind of method that utilization calcium carbide waste residue treatment passivation for stainless steel cleans waste water, it is characterised in that comprise the following steps：
Step S1, wastewater equalization pond is imported by passivation for stainless steel cleaning waste water, then is transferred to neutralization chamber, is being neutralized by measuring pump
Liquid caustic soda is added in groove, the pH value for making passivation for stainless steel clean waste water is adjusted to 8.5~9.5, and the stainless steel obtained after alkali adjustment is blunt
Change cleaning waste water；
Step S2, the passivation for stainless steel cleaning waste water after the alkali adjustment that step S1 is obtained is flowed into depositing reservoir, by metering
Pump adds PAMC, the Fe in passivation for stainless steel cleaning waste water after adjusting alkali3+、Cr3+、Ni2+And Mn4+Point
Sheng Cheng not Fe (OH)3、Cr(OH)3、Ni(OH)2With Mn (OH)4Precipitate and be separated from the water out, obtain clarifying waste liquid；
Step S3, calcium carbide waste slag is added water and is deployed into the calcium carbide waste slag suspension of 15wt%~30wt%；
Step S4, the clarification waste liquid after the separation that step S2 is obtained is transferred in fluorination reaction pond, by controlling pneumatic operated valve
It is the hydrochloric acid solution of 10wt%~15wt% that aperture and switch add concentration, after the pH of regulation clarification waste liquid, adds step S3
The calcium carbide waste slag suspension for obtaining, then adds aluminium polychloride by measuring pump, and mixed liquor is flowed into sedimentation basin, makes
Fluorine ion is with calcium ion to symphysis into CaF2Precipitate and remove；
Step S5, will remove CaF in step S42The exhausted water of precipitation is flowed into final neutralization chamber, is added in final neutralization chamber
Neutralizer, is disposed waste liquid；The pH for disposing waste liquid is adjusted to 6.8~7.2, then discharged through sand filter, that is, complete stainless
The treatment of steel passivation cleaning waste water.
2. the method that utilization calcium carbide waste residue treatment passivation for stainless steel according to claim 1 cleans waste water, it is characterised in that
In step S2, the addition of the PAMC is the passivation for stainless steel cleaning wastewater quality after alkali adjustment
0.003 ‰~0.005 ‰.
3. the method that utilization calcium carbide waste residue treatment passivation for stainless steel according to claim 1 cleans waste water, it is characterised in that
In step S2, the Fe (OH)3、Cr(OH)3、Ni(OH)2With Mn (OH)4Precipitation is concentrated in being transferred to concentration basin, then will
Concentrate makees resource reclaim treatment after plate and frame filter press is extruded.
4. the method that utilization calcium carbide waste residue treatment passivation for stainless steel according to claim 3 cleans waste water, it is characterised in that
The concentrate through extruding is used as the raw materials for metallurgy of stainless steel.
5. the method that utilization calcium carbide waste residue treatment passivation for stainless steel according to claim 1 cleans waste water, it is characterised in that
In step S3, the composition of the calcium carbide waste slag includes：Ca(OH)2。
6. the method that utilization calcium carbide waste residue treatment passivation for stainless steel according to claim 5 cleans waste water, it is characterised in that
The Ca (OH)2Quality account for more than the 90% of calcium carbide waste slag quality.
7. the method that utilization calcium carbide waste residue treatment passivation for stainless steel according to claim 1 cleans waste water, it is characterised in that
In step S4, be adjusted to for pH of mixed by the hydrochloric acid solution：5~6.
8. the method that utilization calcium carbide waste residue treatment passivation for stainless steel according to claim 1 cleans waste water, it is characterised in that
In step S4, the addition of the calcium carbide waste slag is 1.1~1.4 times of calcium theoretical value.
9. the method that utilization calcium carbide waste residue treatment passivation for stainless steel according to claim 1 cleans waste water, it is characterised in that
In step S4, the addition of the aluminium polychloride is 0.2%~0.6% of the clarification waste liquid quality after separating.
10. the method that utilization calcium carbide waste residue treatment passivation for stainless steel according to claim 1 cleans waste water, its feature exists
In, in step S4, the CaF2Precipitate the raw material for being used as sintered building haydite after being concentrated through filter press.
The method that 11. utilization calcium carbide waste residue treatment passivation for stainless steels according to claim 1 clean waste water, its feature exists
In in step S5, the neutralizer is：Any one or two kinds of in NaOH solution, HCl solution.
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| CN110482672A (en) * | 2019-07-25 | 2019-11-22 | 昆明理工大学 | A method of arsenic in waste acid is efficiently removed for source of iron in situ with magnetic iron ore |
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