CN102285743A - Harmless treatment method for sludge containing heavy metals - Google Patents
Harmless treatment method for sludge containing heavy metals Download PDFInfo
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- CN102285743A CN102285743A CN2010106172573A CN201010617257A CN102285743A CN 102285743 A CN102285743 A CN 102285743A CN 2010106172573 A CN2010106172573 A CN 2010106172573A CN 201010617257 A CN201010617257 A CN 201010617257A CN 102285743 A CN102285743 A CN 102285743A
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Abstract
The invention relates to a chemical treatment method, in particular to a harmless treatment method for tail sludge containing heavy metals, which can be used for smelting and extracting metals such as nickel, chromium, copper and the like through a wet process. The harmless treatment method comprises the steps of putting leftover sludge into a slurry pond and adding a proper amount of water to agitate for 30min; and then adding R-type composite chemicals into the pond, continuously agitating, stopping adding the chemicals till the pH reaches 7.5-8.5, conducting reduction reaction for 0.5-1 hour, conducting pressure filtration after the completion of the reaction, obtaining the press-filtered sludge which is harmless sludge and can be treated conveniently, and discharging the treated sludge out of a treatment system. The harmless treatment method for the tail sludge containing heavy metals has the advantages that the operating process is simple, the raw materials can be obtained easily, the cost is lower and the harmful residues cannot do harm to the environment any longer by treating the residues of the sludge containing heavy metals. The harmless treatment method for the tail sludge containing heavy metals can be widely used for the treatment of similar pollutants in stainless steel and electroplating industries.
Description
Technical field
The present invention relates to a kind of chemical treatment method, specifically be meant a kind of method that the leftover bits and pieces mud (tailings) of metals such as sludge containing heavy metal hydrometallurgy extraction nickel chromium triangle copper is carried out harmless treatment.
Technical background
China is a stainless steel big producing country, and annual production has reached 2,000 ten thousand tons, annual all will produce a large amount of stainless steel products, and what be accompanied by in the course of processing is the generation of a large amount of pickling waste waters.And the mud that these waste water produce after treatment contains a large amount of heavy metals and harmful element, if do not deal carefully with, and then can serious environment pollution.
According to the stainless steel tube processing enterprise of Songyang County, Zhejiang, produced Stainless Steel Products in 2009 to reach more than 100,000 tons, these enterprises add deeply at product that have 350,000 tons of pickling waste waterss to produce every year approximately in the acid cleaning process, handle the back with lime method and produce the about 20,000 tons/a of mud.The mud (tailings) of getting a foothold after hydrometallurgy extracts chromium nickel heavy metal still contains pollution substances such as certain iron, nickel, chromium, and also genus danger is given up admittedly as dealt with improperly and will bring very big influence to environment.The inventor is according to the analyzing and testing result to the sampling of leftover bits and pieces mud, and the process great deal of experimental, has proposed the leftover bits and pieces mud of heavy metals such as Ni and Cr contained is concentrated the process technology scheme that carries out harmlessness disposing.
Both at home and abroad at present the method that sludge containing heavy metal is disposed is more, mainly is divided into two big classes: one, carry out the resource utilization recycling earlier, after carry out harmlessness disposing; Two, directly carry out harmlessness disposing.Aspect the resource utilization recycling, the branch of pyrometallurgical smelting and hydrometallurgy is arranged again, the pyrometallurgical smelting rate of recovery is higher, but because bottlenecks such as its energy consumption and environmental pollution retrain, is controlled; Though and hydrometallurgy has the lower advantage of its energy consumption, exist leftover bits and pieces mud (tailings) still to belong to useless admittedly this outstanding problem of danger, effective solution is brickmaking or system cement at present; By vitrifying or lattice distortion method, make heavy metal stabilization; But in the developed area, population collection city especially, as Shanghai City, brick field and cement mill have not allowed to exist; Therefore, how science solves the contradiction of this development and environmental protection, has become numerous environmental protection scientific workers and has paid close attention to jointly, but a historic difficult problem of properly settling is not arranged at present as yet.
The present invention is employingization slurry, R
SType compound reduction single stage method is handled the processing method of sludge containing heavy metal, solves its innoxious problem and the tailings after this method processing is carried out the poisonous substance leaching test, proves that it has reached innoxious purpose really; Thereby having solved domestic ubiquitous sludge containing heavy metal needs the strange land to shift a difficult problem of disposing.The present invention not only can solve the problem of mud on-the-spot disposal, and danger is given up admittedly becomes general mud, and it is that urban construction is used with soil that the mud after the processing can be used as conventional; Avoid the dangerous solid useless trouble that transportation causes of stacking, especially be suitable for the corresponding disposal of big and medium-sized cities.
Summary of the invention
The present invention is directed to deficiency of the prior art, propose that a kind of convenience is feasible, the outstanding effect technical scheme.
The present invention is achieved by following technical proposals:
To the sewage sludge harmlessness disposing method of metals such as Ni and Cr contained, it is characterized in that comprising the steps:
(1), adds an amount of water and stir 30min with in placing of the leftover bits and pieces mud stock tank; In the pond, add R then
SType compound, and continue to stir, hydro-oxidation sodium stops dosing until pH7.5-8.5 simultaneously, allows its reduction reaction 0.5-1 hour; The amount that generally adds entry in changing stock tank is about 5 times of weight of leftover bits and pieces mud; Leftover bits and pieces mud alleged among the present invention is meant the refuse that is produced in the stainless steel acid cleaning waste water treating processes, these refuses need discharging, but does not meet the waste of environmental protection requirement; In these leftover bits and pieces mud, generally contain metals such as certain nickel, chromium, iron, if do not handle, then there is the secondary pollution environment after the discharging, other contains the material of heavy metal, tailings, and the leftover bits and pieces mud that also can be used as among the present invention is handled, as electroplating sludge, nickel oxide ore mine tailing etc.; R
SThe type compound is mainly sulfide, as aluminium sulfide, potassium sulphide, sulfurated lime, zinc sulphide, magnesium sulfide, sodium sulphite; And composite cationic PAM arranged, and compound proportion is mass ratio 100: 0.5～1.5, as preferably, and R
SThe type compound is the water-soluble rate of mass percent 20%, R
SThe type compound is aluminium sulfide, sulfurated lime.
(2) after question response is finished, carry out press filtration, the mud after the press filtration is innoxious mud can carry out the routine disposal, i.e. the mud of postpone of living in can be discharged disposal system, and no longer environment is had secondary pollution harm, also meets the environmental protection standard of country's discharging; Filtrate can be done middle water reuse.
Step (1) is a committed step of the present invention, in order to realize the sludge containing heavy metal harmlessness disposing, need be undertaken the toxicity characteristic leaching procedure checking to these mud of getting a foothold by the related standards of country, and heavy metal ion content wherein must be up to standard.In this step, by the chromium, nickel, the iron plasma that contain in the washing tailings, major part has been dissolved out the ion of these metals and the R of adding in changing stock tank
SThe type compound carries out reduction reaction, and corresponding ion is no longer worked the mischief to environment etc.
Beneficial effect: by use of the present invention, the residue of sludge containing heavy metal is disposed, can be made noxious residue no longer endanger environment, general solid useless through the correlation detection genus of environmental administration, can carry out conventional processing; Operating procedure convenience of the present invention and raw material are obtained easily, and expense is lower.
Embodiment
Below enforcement of the present invention is specified:
Embodiment 1
Get 100g leftover bits and pieces mud, add 500ml distilled water, stir 30min, guaranteeing does not have block in the solution, adds a certain amount of R in solution
SThe type compound stirs 30min, to be that endpoint calculation adds dose about pH7.5～8.5, will to stir back solution and filter, and filtrate is carried out reuse, and its moisture content is measured in the filter residue that takes a morsel oven dry; The toxicity of doing other mud leaches and uses.
The toxotest concrete operations are as follows:
Get filter residue 70g (butt) and add the 700g dissolved in distilled water,
Stir 18h, stirring frequency is controlled at 30r/min,
After leaving standstill 30min its leach liquor is carried out toxicity leaching (it is as shown in the table to leach numerical value), surveys nickel content and chromium content in the solution:
Leach the GB that poisonous substance nickel content all is lower than 5mg/L, chromium content is all far below the GB of 15mg/L.
As seen from the above table: to the disposal of above-mentioned mud, arrived innoxious purpose, can effectively solve secondary pollution problems, this programme can effectively solve the sewage sludge harmlessness disposing difficult problem to metals such as Ni and Cr containeds, but and comprehensive reutilization turn waste into wealth; Of the present invention applying has important social benefit and environmental benefit.
Embodiment 2
Electroplating sludge carries out harmless treatment through processing method of the present invention, can carry out harmlessness disposing to heavy metal equally, tests factually that conclusion is same as a result.
Get 100g and electroplate waste material, add entry and stir, the amount that adds entry is 500g; After stirring fully, in waste water, add R
SThe type compound is being terminal point about pH7.5-8.5; Filter then, filtrate recycle, and filter residue carries out drying, can be by common solid useless the processing.
Get a part of filter residue and be dissolved in the water, solution stirring 18h, stirring frequency is controlled at 30r/min, leaves standstill to survey GOLD FROM PLATING SOLUTION behind the 30min and belong to content, and every metal content index all is lower than national standard, table specific as follows:
Embodiment 3
The present invention contains the heavy metal harmless treatment of useless tailings admittedly after being applicable to hydrometallurgy, and certain nickel oxide ore mine tailing contains Ni:0.85% (butt) and adopts present method to handle equally.
Get the useless admittedly tailings of 100g, add entry and stir, the amount that adds entry is 500g; After stirring fully, in waste water, add R
SThe type compound is being terminal point about pH7.5-8.5; Filter then, filtrate recycle, and filter residue carries out drying, can be by general solid useless the processing.
Get a part of filter residue and be dissolved in the water, solution stirring 18h, stirring frequency is controlled at 30r/min, leaves standstill to survey GOLD FROM PLATING SOLUTION behind the 30min and belong to content, and every metal content index all is lower than national standard, table specific as follows:
The toxicity of carrying out residue after the processing leaches and meets national standard, has not belonged to Hazardous wastes.
This programme has hewed out a distinct new processing direction outside the method that existing sludge containing heavy metal is handled, can solve the not problem of the relevant mud unit of acceptance of big city effectively.It is inexorable trend that cement mill, brick field are eliminated by urbanization, and relevant city can use the present invention, accomplishes will contain in the city the useless on-the-spot disposal of heavy metal danger, needn't transport outward, and the mud after handling has belonged to general mud, can be used in the construction in city again.
Claims (3)
1. the sludge containing heavy metal harmless disposal method is characterized in that comprising the steps:
(1) with in placing of the leftover bits and pieces mud stock tank, be 5: 1 by the mass ratio of water and leftover bits and pieces mud, add entry and stir 30min;
(2) add 0.6～1%R toward changing in the stock tank then
SThe type compound, and continue to stir, and use sodium hydrate regulator solution pH7.5-8.5, reacted again 0.5-1 hour;
(3) after question response is finished, carry out press filtration, the mud after the press filtration carries out common disposal, and filtrate is done middle water reuse.
2. method of disposal according to claim 1 is characterized in that the R in the described step (2)
SThe type compound is mainly sulfide, is specially aluminium sulfide, potassium sulphide, sulfurated lime, zinc sulphide, magnesium sulfide, sodium sulphite; And composite cationic PAM being arranged, compound proportion is the mass ratio 100: 0.5～1.5 of sulfide and cationic PAM.
3. the described method of disposal of right claim 2 is characterized in that described R
SThe type compound is the water-soluble rate of mass percent 20%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106172573A CN102285743A (en) | 2010-12-28 | 2010-12-28 | Harmless treatment method for sludge containing heavy metals |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106172573A CN102285743A (en) | 2010-12-28 | 2010-12-28 | Harmless treatment method for sludge containing heavy metals |
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| CN102285743A true CN102285743A (en) | 2011-12-21 |
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| CN2010106172573A Pending CN102285743A (en) | 2010-12-28 | 2010-12-28 | Harmless treatment method for sludge containing heavy metals |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104310732A (en) * | 2014-10-28 | 2015-01-28 | 山东博润工业技术股份有限公司 | High-temperature plasma vitrification device for sludge and treatment method thereof |
| CN116143362A (en) * | 2023-02-28 | 2023-05-23 | 光大国信环保科技(北京)有限公司 | Method for adsorbing heavy metals in sludge by using zeolite |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1507744A1 (en) * | 1986-12-02 | 1989-09-15 | Курский Политехнический Институт | Method of dehydrating waste water sediments |
| CN1544366A (en) * | 2003-11-21 | 2004-11-10 | 同济大学 | Sludge heavy metal disposing method in land utilization |
| CN101003412A (en) * | 2006-12-31 | 2007-07-25 | 湖南华迪电力环保工程技术有限公司 | Method and system unit for flue gas desulfurization and wastewater treatment |
| CN101863600A (en) * | 2009-04-16 | 2010-10-20 | 刘文治 | Method for removing heavy metals from activated sludge |
-
2010
- 2010-12-28 CN CN2010106172573A patent/CN102285743A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1507744A1 (en) * | 1986-12-02 | 1989-09-15 | Курский Политехнический Институт | Method of dehydrating waste water sediments |
| CN1544366A (en) * | 2003-11-21 | 2004-11-10 | 同济大学 | Sludge heavy metal disposing method in land utilization |
| CN101003412A (en) * | 2006-12-31 | 2007-07-25 | 湖南华迪电力环保工程技术有限公司 | Method and system unit for flue gas desulfurization and wastewater treatment |
| CN101863600A (en) * | 2009-04-16 | 2010-10-20 | 刘文治 | Method for removing heavy metals from activated sludge |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104310732A (en) * | 2014-10-28 | 2015-01-28 | 山东博润工业技术股份有限公司 | High-temperature plasma vitrification device for sludge and treatment method thereof |
| CN104310732B (en) * | 2014-10-28 | 2016-03-23 | 山东博润工业技术股份有限公司 | A kind of sludge high temperature plasma vitrifying device and treatment process thereof |
| CN116143362A (en) * | 2023-02-28 | 2023-05-23 | 光大国信环保科技(北京)有限公司 | Method for adsorbing heavy metals in sludge by using zeolite |
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Application publication date: 20111221 |