CN106865729A - A kind of method of utilization molten iron pretreatment desulfurizing Slag treatment containing chromium heavy metal wastewater thereby - Google Patents
A kind of method of utilization molten iron pretreatment desulfurizing Slag treatment containing chromium heavy metal wastewater thereby Download PDFInfo
- Publication number
- CN106865729A CN106865729A CN201710174100.XA CN201710174100A CN106865729A CN 106865729 A CN106865729 A CN 106865729A CN 201710174100 A CN201710174100 A CN 201710174100A CN 106865729 A CN106865729 A CN 106865729A
- Authority
- CN
- China
- Prior art keywords
- heavy metal
- molten iron
- metal wastewater
- waste water
- pretreatment desulfurizing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
- C02F1/705—Reduction by metals
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/44—Time
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The present invention relates to a kind of method of utilization molten iron pretreatment desulfurizing Slag treatment containing chromium heavy metal wastewater thereby.Comprise the following steps：The Magnetic Materials in molten iron pretreatment desulfurizing slag are selected in magnetic separation, the hexavalent chrome reduction treatment that Magnetic Materials less than 5mm are used in heavy metal wastewater thereby containing chromium, in waste water after iron tailings will be selected to be added to reduction treatment again, for the chemical precipitation treatment of trivalent chromium and other heavy metal ion, last waste water water outlet after separation of solid and liquid, effluent quality reaches state sewage emission standard.The present invention takes full advantage of the chemical property feature that steel and iron industry discarded object-molten iron pretreatment desulfurizing slag contains the alkaline matters such as the reducing substances such as fe, CaS, C and CaO and MgO, the precipitate reduction containing chromium heavy metal wastewater thereby is used it for process, cost for wastewater treatment can not only be reduced, the discharge of waste residue, economic benefit and obvious environment benefit can also be reduced.
Description
Technical field
The invention belongs to the recycling and industrial waste water treatment of industrial residue, and in particular to one kind is utilized
Method of the molten iron pretreatment desulfurizing Slag treatment containing chromium heavy metal wastewater thereby.
Background technology
Heavy metal pollution has become one of maximum water pollution problems of current harm, and wherein Cr VI is larger toxicity
One class pollution element.Because exceeded chromate waste water blindly discharges in part processing enterprise, region water body and the ecosystem are caused
Serious environmental pollution and existence and the health of the mankind are jeopardized.
At present, the processing method containing chromium heavy metal wastewater thereby has chemical reduction method, electroosmose process, absorption method, bioanalysis, film
Method, ion-exchange etc., wherein chemical reduction method is most widely used, and conventional reducing agent mainly has SO2、FeSO4 、
Na2SO3、NaHSO3, Fe etc., how to select the key that a kind of efficient, inexpensive reducing agent is chemical reduction method.
Molten iron pretreatment desulfurizing slag is the class waste residue produced in iron and steel enterprise's molten iron pre-desulfurization operation, and its feature is
Iron-holder is very high, total iron content more than 50%, and metallic iron content up to 20%-40%.
Particulate iron in molten iron pre-desulfurization slag measures height containing S, is not suitable for returning to ironmaking or steel-making is used, therefore steel is looked forward at present
Owner will reclaim the metallic iron of more than 5mm in slag, select the tailings after iron discarded or store up, the particulate iron in slag and other effectively into
Divide and be not fully used.
Select a large amount of thin abrasive grit in the molten iron pretreatment desulfurizing slag after iron, and the reduction such as FeO, CaS, the C contained in slag
Property material, is used as the reducing agent of the reduction treatment of heavy metal wastewater thereby containing chromium.
In addition, alkaline matter CaO, MgO and the CaS in iron tailings are selected, can be as trivalent chromium in heavy metal wastewater thereby containing chromium
And the precipitating reagent of other heavy metal ion.
In sum, molten iron pretreatment desulfurizing slag can be real as a kind of material of heavy metal containing wastewater treatment containing chromium of low cost
Existing " treatment of wastes with processes of wastes against one another ".
The content of the invention
It is an object of the invention to provide a kind of utilization molten iron pretreatment desulfurizing Slag treatment containing chromium heavy metal wastewater thereby method, both
Molten iron pretreatment desulfurizing slag can be made to be fully used, the processing cost of waste water can be reduced again.
A kind of method of utilization molten iron pretreatment desulfurizing Slag treatment containing chromium heavy metal wastewater thereby, comprises the following steps：
Step 1：The Armco magnetic iron in molten iron pretreatment desulfurizing slag is selected in dry method low intensity magnetic separation, and the Armco magnetic iron that will be selected is sieved, greatly
Used in the return steel mill of more than 5mm, Armco magnetic iron of the granularity less than 5mm selects iron tailings to be used as weight for wastewater reduction treatment
Metal-precipitator；
Step 2：Magnetic Materials by the granularity described in step 1 less than 5mm are reacted with heavy metal wastewater thereby containing chromium, are then adjusted with acid
Section pH value of waste water is 1 ~ 3, and reaction temperature is normal temperature, after reaction completely, the Fe in water3+With Fe (OH)3Form is precipitated, by precipitation
Treatment, the waste water after clarification is for further processing, and precipitating sludge is recycled；
Step 3：Waste water enters neutralization reaction pond after step 2 clarification, and other heavy metal ion are by precipitation from waste water in making waste water
Middle removal, adds described in step 1 in waste water and selects iron tailings, is 7 ~ 10 using the pH value for selecting iron tailings to adjust waste water, reaction
Temperature is normal temperature, reacts 10 ~ 30min, finally carries out separation of solid and liquid, obtains processing water outlet.
According to embodiments of the present invention, the Magnetic Materials described in step 2 are reacted used anti-with heavy metal wastewater thereby containing chromium
It can be fixed bed reactors or mechanical mixture formula reactor to answer device, and when fixed bed reactors are used, hydraulic detention time is 2
~ 12h, when using mechanical mixture formula reactor, the mechanical mixture time is 10 ~ 30min.
According to embodiments of the present invention, the spent acid that can be used with acid produced by steel mill of the regulation pH value described in step 2.
According to embodiments of the present invention, when fixed bed reactors are used, the precipitating sludge described in step 2 is recycled
Mode is：Iron oxide red will be made after sludge dewatering.
According to embodiments of the present invention, when using mechanical mixture formula reactor, the precipitating sludge described in step 2 is reclaimed
Land use systems are：The complete Armco magnetic iron of unreacted is first selected by wet magnetic separation before calcination and is recycled, then will
Sludge dewatering is made iron oxide red.
According to embodiments of the present invention, the separation of solid and liquid described in step 3 is to precipitate or filter.
This method using the heavy metal in waste residue precipitate reduction treatment heavy metal wastewater thereby containing chromium, therefore when also containing in waste water
During other pollutants such as COD, BOD, cyanide, can combine at the processing methods such as conventional flocculation sediment, bioanalysis, absorption method
Reason, makes water outlet water quality reaching standard.
The beneficial effects of the invention are as follows：（1）The property feature of molten iron pretreatment desulfurizing slag is taken full advantage of, uses it for containing
The treatment of chromium heavy metal wastewater thereby, can both reduce the processing cost of waste water, and the minimizing of waste residue is realized again, reach " with useless
Control useless " purpose；（2）Compared with iron chip filter treatment, the Armco magnetic iron in molten iron pretreatment desulfurizing slag is not required to carry out oil removing, removal of impurities etc.
Pre-process and can directly use, and it is shaped as bulk, more more convenient than clastic iron filings to use, it is also containing a small amount of in addition
S2-, it is also possible to reduction is played, with reduction effect more more preferable than iron filings；（3）I.e. can be real using a kind of trade waste
Now treatment simultaneously to various heavy；（4）Desulfurization slag tailings is processed using the molten iron selected after iron replace NaOH for heavy metal
The precipitation of ion can less plus or be not added with flocculant because in slag dissolution Ca2+、Mg2+、Fe2+Deng multivalent ion and slag in itself
Suction-operated is conducive to elimination of colloid stability.
Specific embodiment
Embodiments of the invention are described in detail below.The embodiments described below is exemplary, is only used for explaining this hair
It is bright, and be not considered as limiting the invention.
Embodiment 1
Certain factory water quality of heavy metal wastewater thereby containing chromium is：PH=4.2, total chromium concn 100mg/L, the mg/L of hexavalent chromium concentration 60, total copper 20
mg/L.The Magnetic Materials less than 5mm selected from molten iron pre-desulfurization slag magnetic separation are added in waste water, addition is 3g/L, adjusted
PH=1.5, makes material be well mixed with waste water in mechanical agitation type reaction tank, stops reacting and entering by sedimentation basin after 10min
Row separation of solid and liquid, the waste water after clarification enters neutralization reaction pond, adds molten iron pre-desulfurization to select iron tailings in neutralization reaction pond, adjusts
Section wastewater pH=8.5, continue to stir 15min, finally enter water outlet after sedimentation basin precipitation process.Effluent quality is：PH=7.5, always
Chromium concn 1mg/L, hexavalent chromium concentration 0.12 mg/L, total copper 0.3mg/L, reaches national sewage comprehensive emission standard.
Embodiment 2
Certain factory water quality of heavy metal wastewater thereby containing chromium is：PH=4, total chromium concn 20mg/L, hexavalent chromium concentration 15 mg/L, COD=180
Mg/L, SS=150 mg/L.It is placed in fixed bed reactors with the Magnetic Materials less than 5mm selected from molten iron pre-desulfurization slag magnetic separation,
Reactor available capacity 24m3, wastewater pH=2 are adjusted, waste water is continuously injected into reactor, and hydraulic detention time 3h, water outlet passes through
Sedimentation basin carries out separation of solid and liquid, adds molten iron pre-desulfurization to select iron tailings in the waste water after clarification, adjusts wastewater pH=8, continues to stir
After mixing 15min, into sedimentation basin precipitation process, sedimentation basin water outlet is further processed by flocculation sediment.Final outflow water water quality is：
PH=7.0, hexavalent chromium concentration 0.05mg/L, COD=30 mg/L, SS=50 mg/L, reach national integrated wastewater discharge one-level mark
It is accurate.
The explanation of above-described embodiment is only intended to understand the method for the present invention and its core concept.It should be pointed out that for this
For the those of ordinary skill in field, under the premise without departing from the principles of the invention, some improvement can also be carried out to the present invention
And modification, these are improved and modification will be also fallen into the protection domain of the claims in the present invention.
Claims (6)
1. a kind of method that utilization molten iron pretreatment desulfurizing Slag treatment contains chromium heavy metal wastewater thereby, it is characterised in that including following step
Suddenly：
Step 1：The Armco magnetic iron in molten iron pretreatment desulfurizing slag is selected in dry method low intensity magnetic separation, and the Armco magnetic iron that will be selected is sieved, greatly
Used in the return steel mill of more than 5mm, Armco magnetic iron of the granularity less than 5mm selects iron tailings to be used as weight for wastewater reduction treatment
Metal-precipitator；
Step 2：Magnetic Materials by the granularity described in step 1 less than 5mm are reacted with heavy metal wastewater thereby containing chromium, are then adjusted with acid
Section pH value of waste water is 1 ~ 3, and reaction temperature is normal temperature, after reaction completely, the Fe in water3+With Fe (OH)3Form is precipitated, by precipitation
Treatment, the waste water after clarification is for further processing, and precipitating sludge is recycled；
Step 3：Waste water enters neutralization reaction pond after step 2 clarification, and other heavy metal ion are by precipitation from waste water in making waste water
Middle removal, adds described in step 1 in waste water and selects iron tailings, is 7 ~ 10 using the pH value for selecting iron tailings to adjust waste water, reaction
Temperature is normal temperature, reacts 10 ~ 30min, finally carries out separation of solid and liquid, obtains processing water outlet.
2. the method that a kind of utilization molten iron pretreatment desulfurizing Slag treatment according to claim 1 contains chromium heavy metal wastewater thereby, its
It is characterised by, the reactor that the Magnetic Materials described in step 2 and heavy metal wastewater thereby containing chromium are reacted used can be fixed bed
Reactor or mechanical mixture formula reactor, when fixed bed reactors are used, hydraulic detention time is 2 ~ 12h, when using mechanical
During mixing reactor, the mechanical mixture time is 10 ~ 30min.
3. the method that a kind of utilization molten iron pretreatment desulfurizing Slag treatment according to claim 1 contains chromium heavy metal wastewater thereby, its
It is characterised by, the spent acid that can be used with acid produced by steel mill of the regulation pH value described in step 2.
4. the method that a kind of utilization molten iron pretreatment desulfurizing Slag treatment according to claim 2 contains chromium heavy metal wastewater thereby, its
It is characterised by, when fixed bed reactors are used, the precipitating sludge described in step 2 carries out recycling mode is：Sludge is taken off
Iron oxide red is made after water.
5. the method that a kind of utilization molten iron pretreatment desulfurizing Slag treatment according to claim 2 contains chromium heavy metal wastewater thereby, its
It is characterised by, when using mechanical mixture formula reactor, the precipitating sludge described in step 2 carries out recycling mode is：Forging
Burning is preceding first to be selected the complete Armco magnetic iron of unreacted and is recycled by wet magnetic separation, and sludge dewatering then is made into oxidation
Iron oxide red.
6. the method that a kind of utilization molten iron pretreatment desulfurizing Slag treatment according to claim 1 contains chromium heavy metal wastewater thereby, its
It is characterised by, the separation of solid and liquid described in step 3 is to precipitate or filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710174100.XA CN106865729A (en) | 2017-03-22 | 2017-03-22 | A kind of method of utilization molten iron pretreatment desulfurizing Slag treatment containing chromium heavy metal wastewater thereby |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710174100.XA CN106865729A (en) | 2017-03-22 | 2017-03-22 | A kind of method of utilization molten iron pretreatment desulfurizing Slag treatment containing chromium heavy metal wastewater thereby |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106865729A true CN106865729A (en) | 2017-06-20 |
Family
ID=59172557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710174100.XA Pending CN106865729A (en) | 2017-03-22 | 2017-03-22 | A kind of method of utilization molten iron pretreatment desulfurizing Slag treatment containing chromium heavy metal wastewater thereby |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106865729A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108975793A (en) * | 2018-09-10 | 2018-12-11 | 唐卫军 | A kind of building block and its preparation method and application of decomposable hardly degraded organic substance |
| CN111250034A (en) * | 2020-03-24 | 2020-06-09 | 江苏科技大学 | Modification method and application of desulfurization slag |
| CN113461097A (en) * | 2021-06-07 | 2021-10-01 | 江苏科技大学 | Method for harmlessly treating hexavalent chromium ions by utilizing metallurgical desulfurization slag |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004002901A1 (en) * | 2002-06-27 | 2004-01-08 | Veracon Metal Ltd. | Method for the removal of contaminant metal ions from waste water |
| CN103508507A (en) * | 2012-06-29 | 2014-01-15 | 南京理工大学 | Method for removing metal ions in water by utilizing magnetically-separated steel slag tailings |
| CN105060439A (en) * | 2015-08-28 | 2015-11-18 | 上海中冶环境工程科技有限公司 | Method for treating acid chromium-contained polluted waste water with molten iron residues as raw material |
-
2017
- 2017-03-22 CN CN201710174100.XA patent/CN106865729A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004002901A1 (en) * | 2002-06-27 | 2004-01-08 | Veracon Metal Ltd. | Method for the removal of contaminant metal ions from waste water |
| CN103508507A (en) * | 2012-06-29 | 2014-01-15 | 南京理工大学 | Method for removing metal ions in water by utilizing magnetically-separated steel slag tailings |
| CN105060439A (en) * | 2015-08-28 | 2015-11-18 | 上海中冶环境工程科技有限公司 | Method for treating acid chromium-contained polluted waste water with molten iron residues as raw material |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108975793A (en) * | 2018-09-10 | 2018-12-11 | 唐卫军 | A kind of building block and its preparation method and application of decomposable hardly degraded organic substance |
| CN111250034A (en) * | 2020-03-24 | 2020-06-09 | 江苏科技大学 | Modification method and application of desulfurization slag |
| CN111250034B (en) * | 2020-03-24 | 2023-07-25 | 江苏科技大学 | Modification method and application of desulfurization slag |
| CN113461097A (en) * | 2021-06-07 | 2021-10-01 | 江苏科技大学 | Method for harmlessly treating hexavalent chromium ions by utilizing metallurgical desulfurization slag |
| CN113461097B (en) * | 2021-06-07 | 2022-08-19 | 江苏科技大学 | Method for harmlessly treating hexavalent chromium ions by utilizing metallurgical desulfurization slag |
| WO2022257352A1 (en) * | 2021-06-07 | 2022-12-15 | 江苏科技大学 | Method for harmlessly treating hexavalent chromium ions by using metallurgical desulfurization slag |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101417850B (en) | Novel process for treating coking waste water by charging activated sludge process | |
| CN111018187A (en) | Wastewater treatment process based on Fenton oxidation reaction | |
| CN105948336B (en) | A kind for the treatment of process of electroplating wastewater containing cyanogens and chrome | |
| CN106865729A (en) | A kind of method of utilization molten iron pretreatment desulfurizing Slag treatment containing chromium heavy metal wastewater thereby | |
| CN113307438A (en) | Treatment method of nickel-cobalt smelting heavy metal wastewater | |
| JP2683991B2 (en) | Dyeing wastewater treatment method | |
| CN110316908A (en) | A kind of stainless-steel cold-rolling acid waste water denitrification treatment process | |
| CN112794555A (en) | Novel method for treating wastewater by reinforced coagulation | |
| CN105084666A (en) | Chemical industry wastewater comprehensive treatment method | |
| CN102336501A (en) | Cold rolled steel coil wastewater treatment method | |
| CN105016569B (en) | Processing system and method for cold rolling reverse osmosis strong brine | |
| CN111995167A (en) | Treatment method of acidic heavy metal wastewater | |
| US3847807A (en) | Removal of cyanide and color bodies from coke plant wastewater | |
| CN202297309U (en) | System for comprehensively treating wastewater generated in pickling process and tanning process | |
| CN106495406A (en) | Efficient river regulation method | |
| JP3513883B2 (en) | Treatment method for chromium-containing wastewater | |
| CN101723497B (en) | Method for processing oily waste water by utilizing ferric hydroxide waste residue | |
| CN209065692U (en) | A kind of sanitary wastewater and metallurgical waste water combined apparatus | |
| JPH05337474A (en) | Treatment of waste water containing heavy metal | |
| CN115140862A (en) | Method for pretreating electroplating wastewater by adopting ozone and Fenton process in cooperation | |
| JPH01184096A (en) | Treatment equipment of waste liquid containing metal | |
| CN110577269A (en) | Composite reagent for removing manganese and ammonia nitrogen in wastewater and application method thereof | |
| CN111087081B (en) | Wastewater treatment method and application thereof | |
| CN110386718A (en) | A kind of processing method of hazardous waste joint disposal central waste | |
| CN215924677U (en) | Chromium-containing electroplating waste liquid treatment combined system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170620 |