CN104711428B - Method for preparing and recovering metal in pickling sludge - Google Patents
Method for preparing and recovering metal in pickling sludge Download PDFInfo
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- CN104711428B CN104711428B CN201510076968.7A CN201510076968A CN104711428B CN 104711428 B CN104711428 B CN 104711428B CN 201510076968 A CN201510076968 A CN 201510076968A CN 104711428 B CN104711428 B CN 104711428B
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- pickling sludge
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- 239000010802 sludge Substances 0.000 title claims abstract description 90
- 238000005554 pickling Methods 0.000 title claims abstract description 89
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 20
- 239000002184 metal Substances 0.000 title claims abstract description 20
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 69
- 238000000034 method Methods 0.000 claims abstract description 62
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 37
- 239000012535 impurity Substances 0.000 claims abstract description 36
- 239000002253 acid Substances 0.000 claims abstract description 29
- 238000002386 leaching Methods 0.000 claims abstract description 12
- 239000011490 mineral wool Substances 0.000 claims abstract description 12
- 239000010440 gypsum Substances 0.000 claims abstract description 6
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 6
- 238000004537 pulping Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 65
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 57
- 239000000706 filtrate Substances 0.000 claims description 40
- 239000012065 filter cake Substances 0.000 claims description 39
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 37
- 210000002966 Serum Anatomy 0.000 claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- MHAJPDPJQMAIIY-UHFFFAOYSA-N hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 30
- 238000003825 pressing Methods 0.000 claims description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 29
- BFDHFSHZJLFAMC-UHFFFAOYSA-L Nickel(II) hydroxide Chemical compound [OH-].[OH-].[Ni+2] BFDHFSHZJLFAMC-UHFFFAOYSA-L 0.000 claims description 24
- 229910052742 iron Inorganic materials 0.000 claims description 23
- 239000001117 sulphuric acid Substances 0.000 claims description 21
- 235000011149 sulphuric acid Nutrition 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 20
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 20
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 19
- 235000015450 Tilia cordata Nutrition 0.000 claims description 19
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 19
- 239000006071 cream Substances 0.000 claims description 19
- 239000004571 lime Substances 0.000 claims description 19
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 19
- 238000003723 Smelting Methods 0.000 claims description 17
- 229910052782 aluminium Inorganic materials 0.000 claims description 15
- 229910052803 cobalt Inorganic materials 0.000 claims description 15
- 229910052710 silicon Inorganic materials 0.000 claims description 15
- 235000020681 well water Nutrition 0.000 claims description 15
- 239000002349 well water Substances 0.000 claims description 15
- 238000000605 extraction Methods 0.000 claims description 13
- 239000002002 slurry Substances 0.000 claims description 13
- VEXZGXHMUGYJMC-UHFFFAOYSA-N HCl Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 11
- 229910052804 chromium Inorganic materials 0.000 claims description 11
- 239000002893 slag Substances 0.000 claims description 11
- 229910052791 calcium Inorganic materials 0.000 claims description 10
- 239000010941 cobalt Substances 0.000 claims description 10
- 238000005868 electrolysis reaction Methods 0.000 claims description 10
- 229910052748 manganese Inorganic materials 0.000 claims description 10
- PMZURENOXWZQFD-UHFFFAOYSA-L na2so4 Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 10
- 239000001187 sodium carbonate Substances 0.000 claims description 10
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 10
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 10
- 235000011152 sodium sulphate Nutrition 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 229910052725 zinc Inorganic materials 0.000 claims description 10
- 238000004090 dissolution Methods 0.000 claims description 9
- 238000001556 precipitation Methods 0.000 claims description 9
- VTLYFUHAOXGGBS-UHFFFAOYSA-N fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims description 8
- 229910001447 ferric ion Inorganic materials 0.000 claims description 8
- 229910001021 Ferroalloy Inorganic materials 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 235000019738 Limestone Nutrition 0.000 claims description 6
- 239000000571 coke Substances 0.000 claims description 6
- 235000011167 hydrochloric acid Nutrition 0.000 claims description 6
- 239000006028 limestone Substances 0.000 claims description 6
- KGBXLFKZBHKPEV-UHFFFAOYSA-N Boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 5
- 229920000742 Cotton Polymers 0.000 claims description 5
- PWEBUXCTKOWPCW-UHFFFAOYSA-N Squaric acid Chemical compound OC1=C(O)C(=O)C1=O PWEBUXCTKOWPCW-UHFFFAOYSA-N 0.000 claims description 5
- 238000005276 aerator Methods 0.000 claims description 5
- 239000004327 boric acid Substances 0.000 claims description 5
- 239000011449 brick Substances 0.000 claims description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 238000000265 homogenisation Methods 0.000 claims description 5
- 229910052749 magnesium Inorganic materials 0.000 claims description 5
- 230000000051 modifying Effects 0.000 claims description 5
- 238000010298 pulverizing process Methods 0.000 claims description 5
- 238000004064 recycling Methods 0.000 claims description 5
- 239000002912 waste gas Substances 0.000 claims description 5
- ASKVAEGIVYSGNY-UHFFFAOYSA-L Cobalt(II) hydroxide Chemical compound [OH-].[OH-].[Co+2] ASKVAEGIVYSGNY-UHFFFAOYSA-L 0.000 claims description 4
- 229910021503 Cobalt(II) hydroxide Inorganic materials 0.000 claims description 4
- 238000006477 desulfuration reaction Methods 0.000 claims description 4
- 230000003009 desulfurizing Effects 0.000 claims description 4
- -1 iron ion Chemical class 0.000 claims description 4
- 238000007792 addition Methods 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 12
- 239000002699 waste material Substances 0.000 abstract description 8
- 229910000510 noble metal Inorganic materials 0.000 abstract description 7
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000010842 industrial wastewater Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 229910000640 Fe alloy Inorganic materials 0.000 abstract 2
- 238000011085 pressure filtration Methods 0.000 abstract 1
- 239000004568 cement Substances 0.000 description 10
- 239000011651 chromium Substances 0.000 description 9
- 229910001385 heavy metal Inorganic materials 0.000 description 8
- 238000007711 solidification Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 150000002739 metals Chemical class 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 235000013601 eggs Nutrition 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000010413 mother solution Substances 0.000 description 3
- 230000000240 adjuvant Effects 0.000 description 2
- 239000002671 adjuvant Substances 0.000 description 2
- 239000010425 asbestos Substances 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052895 riebeckite Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N Sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium monoxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 229910000428 cobalt oxide Inorganic materials 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000004692 metal hydroxides Chemical class 0.000 description 1
- 101710031899 moon Proteins 0.000 description 1
- 229910000480 nickel oxide Inorganic materials 0.000 description 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000004450 types of analysis Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention belongs to the technical field of recovery of pickling sludge, and particularly discloses a method for producing and recovering noble metal in pickling sludge. The method comprises the following steps: smashing and pulping, and performing pressure filtration, primary impurity removal and secondary impurity removal, tertiary impurity removal, primary nickel deposition and secondary nickel deposition to prepare iron alloy, mineral wool, gypsum and a nickel plate. The method has the benefits that noble metal in the pickling sludge is recovered by a high-pressure acid leaching method; waste residue recovered is comprehensively processed to produce iron alloy and a mineral wool product; compared with a traditional wet process, the method has the advantages that all available metal can be extracted from waste, secondary pollution possibility is reduced, energy consumption is reduced, and zero emission of industrial wastewater is realized.
Description
Technical field
The invention belongs to pickling sludge recycle technical field, and in particular to one kind is prepared for pickling sludge and reclaims gold
The method of category.
Background technology
At present, pickling sludge produce after go back the parallel processing method of neither one economic and technical, both at home and abroad frequently with
Method is solid landfill method, and contains substantial amounts of heavy metal in pickling sludge, pickling sludge is carried out before landfill disposal, it is necessary to
Solidification stabilized treatment is carried out to it, conventional firming agent by cement, Colophonium, glass, waterglass etc., wherein, cement is the most normal
One of firming agent seen, cement solidification refers to and mixes waste with ordinary cement that formation has the firming body of some strength, so as to
The purpose of hazard component leaching rate in waste is reduced, although cement solidification method is widely used, but, there is occupation of land face in it
Product is big, the shortcoming that solidification heavy metal of body long-time stability cannot be guaranteed, and for this problem, external some scholar's research are sent out
It is existing：Appropriate additive is added to improve solidification effect and the dissolution rate, the saving that reduce harmful substance while cement solidification
Cement consumption, and increase quick solidifying intensity, such as AsavapisitS. makes some using alkaline systems such as cement, flyash sludge
The stability of heavy metal hydroxide reaches optimal state, reduce caused by the heavy dissolubility because of pickling sludge to binder
The collaboration negatively influencing of water reaction, however, the research of domestic some scholars shows：The application of flyash makes copper in solidified cement body
Bad stability, add xanthates processing heavy metal sewage sludge in ordinary cement, the leaching rate of heavy metal can be reduced.
The mass fraction that copper, nickel, chromium in China's pickling sludge etc. is increased one's knowledge is higher, can be made by some enterprises as raw material
With in recent years, the research of domestic and international pickling sludge resource is concentrated mainly on heavy metal recovery technology and materialized technology, and this is two big
Aspect, for the resource recovery technology of pickling sludge adopts following methods：The acid-hatching of young eggs and ammonia leaching process, the acid-hatching of young eggs is referred to sulfur
The acid such as acid, hydrochloric acid is used as digestion agent, the method that the target components of solubility are extracted from pickling sludge, smelting process and roasting
Burn leaching method, smelting process mainly to reclaim copper, for the purpose of nickel, with coal, coke as fuel and reducing substances, iron ore, copper mine
The method that stone, limestone etc. are produced for adjuvant, roasting leaching method is using the impurity in high-temperature roasting pretreating sludge, then uses
The media such as acid, water extract valuable metal in product of roasting, burn absorption method, refer on the basis of pickling sludge incineration melting,
The method recycled to the heavy metal in incineration slag, adopts this method and has the advantages that high treating effect, invests little,
But, the temperature of burning is leached to metal and had an impact；Materialized technology, refers to by the use of pickling sludge and is produced as raw material or adjuvant
The process of construction material or other materials.
In sum, pickling Treatment of Sludge resource is always research emphasis both domestic and external, has carried out many researchs simultaneously
Obtain certain achievement, but up to the present industrialization and it is few, solidification hole buries most commonly seen, and it can not be fundamentally real
Minimizing, the innoxious and resource of existing pickling sludge, in the resource scheme having pointed out, only extraction, burning is reclaimed
Method and materialized technology are more feasible, and the extraction rate height of extraction heavy metal, burning recovery can effectively realize that sludge subtracts
Quantify and innoxious.
Therefore, based on the problems referred to above, the present invention provides a kind of method for preparing recovery metal for pickling sludge.
The content of the invention
Goal of the invention：It is an object of the invention to provide a kind of prepare the method for reclaiming metal for pickling sludge, its utilization
The high pressure acid-hatching of young eggs is reclaimed to the noble metal in pickling sludge, while carrying out being produced after comprehensive process to the waste residue after recovery
Ferroalloy and asbestos product, compared with conventional wet, can extract all available metals from waste, reduce the several of secondary pollution
Rate, reducing energy consumption, realize zero discharge of industrial waste water.
Technical scheme：The present invention provides a kind of method for preparing recovery metal for pickling sludge, comprises the following steps,
Step 1, industry water blender stirring pulping will be added after pickling sludge raw material pulverizing first, then by pickling sludge
Serosity introducing concentrator is settled, concentration, wherein, the pickling sludge serosity of overflow in concentrator is introduced back into stirring
Machine.
Step 2, to the pickling sludge bottom slurry in concentrator, aqueous concentration is 10%-15%, introduce homogenization groove carry out
Transfer, dispensing, wherein, add anhydrous sodium sulfate, hydrogen peroxide to be mixed.
Step 3, leaching, introduce agitator tank, by valuable metals such as Ni, Co by the pickling sludge mixed serum of step 2
Leach, add nickeliferous sour water and concentrated sulphuric acid, leached using steam heating, wherein, pickling sludge mixed serum final ph
For 1.5-2.0.
Step 4, a remove impurity, introduce agitator tank, by three by pickling sludge mixed serum of the step 3PH value for 1.5-2.0
The precipitation such as valency iron ion, Al, Cr, Si is removed, and is added and is stirred after hydrogen peroxide, nickeliferous pickling mud and lime cream, using steam
Heating is leached, wherein, pickling sludge mixed serum final ph is 3.8-4.2.
Step 5, filter pressing process is carried out to the pickling sludge mixed serum of step 4 using pressure filter.
Step 6, the filter cake tailings of step 5 is dried first brickmaking process, then by obtained brick pass through smelting furnace
Melted, using aerator air blast, wherein, add coke, white residue and limestone to carry out melting, gained molten iron in smelting furnace
For ferroalloy, gained slag sends into rock wool stove and carries out producing rock wool, and waste gas utilization water film dedusting is processed, smelting furnace and cotton processed
Middle residue is granulated slag.
Brickmaking machine is again introduced in step 7, step 6 into a part of dust of water film dedusting to be processed, another part adds
Entering lime cream carries out desulfurization process, and produced gas emptying, produced slurry Jing is filtered and gypsum filter cake is obtained.
Step 8, first agitator tank is introduced to the filtrate of step 5, add hydrogen peroxide and lime cream to carry out secondary remove impurity, enter one
Step removes the precipitation such as ferric ion, Al, Cr, Si, wherein, pickling sludge mixed serum final ph is 5-5.5.
Step 9, by step 8 pickling sludge mixed serum introducing concentrator settled, separating treatment, wherein, bottom liquid return
It flow to step 3 to process.
Step 10, the nickel that once sunk to introducing agitator tank addition liquid caustic soda in overflowing liquid in step 9 are processed, wherein, overflow
Liquid final ph is 7.8-8.2.
Step 11, the overflowing liquid of step 10 is introduced concentrator, then serosity obtained by nickel hydroxide and well water is introduced into dense
Close machine is settled, separating treatment.
Step 12, the underflow of step 11 is carried out into filter pressing process using pressure filter, filter cake nickel hydroxide is obtained.
Step 13, nickel hydroxide obtained in step 12 is inserted slurrying tank carry out the molten process of a subacid, wherein, add well water
It is molten acid to be carried out with concentrated sulphuric acid.
Step 14, the serosity of step 13 is introduced agitator tank carry out three remove impurity and process, be stirred for adding sodium carbonate in groove
Liquid concentration is stirred removing Fe, Al, Si etc. for 5%-8%, and final ph is 4.8-5.0.
Step 15, the serosity to step 14 carry out filter pressing using pressure filter, pulp filter cake is obtained and filtrate enters next work
Sequence.
Step 16, the filtrate of step 15 is introduced extraction box add P204 organic faciess, liquid caustic soda, sulphuric acid and hydrochloric acid to carry out depth
Remove impurity, removes the impurity such as Fe, Ca, Zn, Mn.
Step 17, the extract of step 16 introduced extraction box add the extract of P507 organic faciess to carry out deep impurity-removing,
Fe, Ca, Zn, Mn, Mg impurity is removed, wherein, liquid caustic soda is imported first in anti-cobalt liquid carries out heavy cobalt, and final ph is 7.5-8, then
Filter pressing is carried out using pressure filter obtain cobalt hydroxide.
Step 18, the extract of step 17 is introduced agitator tank, add sodium carbonate liquid concentration and carry out for 5%-8% it is secondary heavy
Nickel process, final ph is 7.8-8.2.
Step 19, the filtrate to step 18 carry out filter pressing and obtain filter cake nickel hydroxide using pressure filter.
Step 20, nickel hydroxide obtained in step 19 is inserted slurrying tank carry out the molten process of quadratic acid, wherein, add well water
Acid is carried out with concentrated sulphuric acid molten, first with anolyte just molten pulp, then with sulfuric acid dissolution, final ph is 2.5-3.
Step 21, recycling pressure filter carry out filter pressing to the serosity of step 20, and pulp filter cake and filtrate is obtained；
Step 22, the filtrate to step 21 are carried out with liquid process, add boric acid, liquid caustic soda, anhydrous sodium sulfate and activated carbon, most
Whole pH value is 4.8-5.
Step 23, the filtrate of step 15, the pulp filter cake of step 21 and step 22 is carried out into filtration treatment, carry out acid adjustment,
Heat treatment, is obtained catholyte.
Step 24, the catholyte of step 23 is introduced in electrolysis bath, adds anolyte and nickelic pure nickel water, logical unidirectional current to enter
Row electrolysis is processed, and nickel plate is obtained.
The technical program, in the step 13, just molten pulp is first carried out to filter cake with anolyte or clear water, then use sulphuric acid
Dissolving, finally adjusts back pH value remove impurity with lime cream, and final ph is 3.8-4.0.
The technical program, acid adjustment, heating, by filtrate pH value 2-4 is modulated in the step 23, will using vapour heating
Acid liquor temperature is heated to be 50 DEG C -70 DEG C.
The technical program, filtrate pH value is modulated to 2.5-3.5 by acid adjustment in the step 23, heating, using steam plus
Acid liquor temperature is heated to be 55 DEG C -65 DEG C by temperature.
Compared with prior art, a kind of beneficial effect for preparing the method for reclaiming metal for pickling sludge of the present invention exists
In：It is reclaimed using the high pressure acid-hatching of young eggs to the noble metal in pickling sludge, while carrying out to the waste residue after recovery comprehensive
Ferroalloy and asbestos product are produced after process, compared with conventional wet, all available metals can be extracted from waste, reduced secondary
The probability of pollution, reducing energy consumption, realize zero discharge of industrial waste water.
Description of the drawings
Fig. 1 is a kind of handling process structural representation that the method for reclaiming metal is prepared for pickling sludge of the present invention；
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment, the present invention is further elucidated.
Embodiment one
The present invention as shown in Figure 1 provides a kind of method for preparing recovery metal for pickling sludge, comprises the following steps,
Step 1, first will after pickling sludge raw material pulverizing add industry water blender stirring pulping, then by pickling sludge serosity introduce
Concentrator is settled, concentration, wherein, the pickling sludge serosity of overflow in concentrator is introduced back into blender.Step 2,
To the pickling sludge bottom slurry in concentrator, aqueous concentration is 10%-15%, and introducing homogenization groove carries out transfer, dispensing, its
In, add anhydrous sodium sulfate, hydrogen peroxide to be mixed.Step 3, leaching, by the pickling sludge mixed serum of step 2
Agitator tank is introduced, the valuable metals such as Ni, Co are leached, add nickeliferous sour water and concentrated sulphuric acid, leached using steam heating, its
In, pickling sludge mixed serum final ph is 1.5-2.0.Step 4, a remove impurity, by the acid that step 3pH value is 1.5-2.0
Wash sludge mixed serum and introduce agitator tank, the precipitation such as ferric ion, Al, Cr, Si is removed, add hydrogen peroxide, nickeliferous pickling
Stir after mud and lime cream, leached using steam heating, wherein, pickling sludge mixed serum final ph is 3.8-
4.2.Step 5, filter pressing process is carried out to the pickling sludge mixed serum of step 4 using pressure filter.Step 6, first to step 5
Filter cake tailings is dried brickmaking process, then obtained brick is melted by smelting furnace, using aerator air blast, its
In, add coke, white residue and limestone to carry out melting in smelting furnace, gained molten iron is ferroalloy, and gained slag sends into rock wool
Stove carries out producing rock wool, and waste gas utilization water film dedusting is processed, and residue is granulated slag in smelting furnace and cotton processed.Step 7, step
Brickmaking machine is again introduced in 6 into a part of dust of water film dedusting to be processed, another part adds lime cream to carry out at desulfurization
Reason, produced gas emptying, produced slurry Jing is filtered and gypsum filter cake is obtained.Step 8, the filtrate of step 5 is drawn first
Enter agitator tank, add hydrogen peroxide and lime cream to carry out secondary remove impurity, further go the precipitation such as ferric ion, Al, Cr, Si
Remove, wherein, pickling sludge mixed serum final ph is 5-5.5.Step 9, by step 8 pickling sludge mixed serum introduce it is dense
Machine is settled, separating treatment, wherein, bottom liquid is back to step 3 and processes.Step 10, in overflowing liquid in step 9 introduce stirring
Groove add liquid caustic soda once sunk nickel process, wherein, overflowing liquid final ph be 7.8-8.2.Step 11, by the overflow of step 10
Liquid introduce concentrator, then by obtained by nickel hydroxide and well water serosity introduce concentrator settled, separating treatment.Step 12,
The underflow of step 11 is carried out into filter pressing process using pressure filter, filter cake nickel hydroxide is obtained.Step 13, by hydrogen obtained in step 12
Nickel oxide is inserted slurrying tank and carries out the molten process of a subacid, wherein, add well water and concentrated sulphuric acid to carry out acid molten.Step 14, by step
13 serosity introduces agitator tank and carries out three remove impurity process, is stirred for adding sodium carbonate liquid concentration to be stirred for 5%-8% in groove
Removing Fe, Al, Si etc. are mixed, final ph is 4.8-5.0.Step 15, the serosity to step 14 carry out filter pressing using pressure filter, system
Obtain pulp filter cake and filtrate enters subsequent processing.Step 16, the filtrate of step 15 is introduced extraction box add P204 organic faciess, liquid
Alkali, sulphuric acid and hydrochloric acid carry out deep impurity-removing, remove the impurity such as Fe, Ca, Zn, Mn.Step 17, the extract of step 16 is introduced into extraction
Taking case adds the extract of P507 organic faciess to carry out deep impurity-removing, removes Fe, Ca, Zn, Mn, Mg impurity, wherein, first in anti-cobalt liquid
Middle importing liquid caustic soda carries out heavy cobalt, and final ph is 7.5-8, and final ph is 7.5-8, recycles pressure filter to carry out filter pressing and obtains hydrogen
Cobalt oxide.Step 18, the extract of step 17 is introduced agitator tank, add sodium carbonate liquid concentration and carry out for 5%-8% it is secondary heavy
Nickel process, final ph is 7.8-8.2.Step 19, the filtrate to step 18 carry out filter pressing and obtain filter cake hydrogen-oxygen using pressure filter
Change nickel.Step 20, nickel hydroxide obtained in step 19 inserted slurrying tank carry out the molten process of quadratic acid, wherein, add well water and
It is molten that concentrated sulphuric acid carries out acid, and first with anolyte just molten pulp, then with sulfuric acid dissolution, final ph is 2.5-3.Step 21, recycling
Pressure filter carries out filter pressing to the serosity of step 20, and pulp filter cake and filtrate is obtained；Step 22, the filtrate to step 21 are carried out with liquid
Process, add boric acid, liquid caustic soda, anhydrous sodium sulfate and activated carbon, final ph is 4.8-5.Step 23, by step 15, step 21
Pulp filter cake and the filtrate of step 22 carry out filtration treatment, carry out acid adjustment, heat treatment, catholyte is obtained.Step 24, will step
Rapid 23 catholyte is introduced in electrolysis bath, adds anolyte and nickelic pure nickel water, logical unidirectional current to carry out electrolysis process, and nickel is obtained
Plate.
Embodiment two
The present invention as shown in Figure 1 provides a kind of method for preparing recovery noble metal for pickling sludge, including following step
Suddenly, step 1, industry water blender stirring pulping will be added after pickling sludge raw material pulverizing first, then by pickling sludge serosity
Introducing concentrator is settled, concentration, wherein, the pickling sludge serosity of overflow in concentrator is introduced back into blender.Step
Rapid 2, to the pickling sludge bottom slurry in concentrator, aqueous concentration is 10%-15%, and introducing homogenization groove carries out transfer, dispensing,
Wherein, anhydrous sodium sulfate, hydrogen peroxide is added to be mixed.Step 3, leaching, by the pickling sludge mixing slurry of step 2
Liquid introduces agitator tank, and the valuable metals such as Ni, Co are leached, and adds nickeliferous sour water and concentrated sulphuric acid, is leached using steam heating,
Wherein, pickling sludge mixed serum final ph is 1.5-2.0.Step 4, a remove impurity, by step 3pH value for 1.5-2.0's
Pickling sludge mixed serum introduces agitator tank, and the precipitation such as ferric ion, Al, Cr, Si is removed, and adds hydrogen peroxide, nickeliferous acid
Wash and stirred after mud and lime cream, leached using steam heating, wherein, pickling sludge mixed serum final ph is
3.8-4.2.Step 5, filter pressing process is carried out to the pickling sludge mixed serum of step 4 using pressure filter.Step 6, first to step
Rapid 5 filter cake tailings is dried brickmaking process, then obtained brick is melted by smelting furnace, is roused using aerator
Wind, wherein, add coke, white residue and limestone to carry out melting in smelting furnace, gained molten iron is ferroalloy, and gained slag is sent into
Rock wool stove carries out producing rock wool, and waste gas utilization water film dedusting is processed, and residue is granulated slag in smelting furnace and cotton processed.Step 7,
Brickmaking machine is again introduced in step 6 into a part of dust of water film dedusting to be processed, another part adds lime cream to be taken off
Sulphuring treatment, produced gas emptying, produced slurry Jing is filtered and gypsum filter cake is obtained.Step 8, first to the filter of step 5
Liquid introduces agitator tank, adds hydrogen peroxide and lime cream to carry out secondary remove impurity, further precipitates ferric ion, Al, Cr, Si etc.
Remove, wherein, pickling sludge mixed serum final ph is 5-5.5.Step 9, by step 8 pickling sludge mixed serum introduce it is dense
Close machine is settled, separating treatment, wherein, bottom liquid is back to step 3 and processes.Step 10, in overflowing liquid in step 9 introduce stir
Mix groove add liquid caustic soda once sunk nickel process, wherein, overflowing liquid final ph be 7.8-8.2.Step 11, overflowing step 10
Flow liquid introduce concentrator, then by obtained by nickel hydroxide and well water serosity introduce concentrator settled, separating treatment.Step
12nd, the underflow of step 11 is carried out into filter pressing process using pressure filter, filter cake nickel hydroxide is obtained.Step 13, step 12 is obtained
Nickel hydroxide insert slurrying tank and carry out the molten process of a subacid, wherein, add well water and concentrated sulphuric acid to carry out acid molten, first use anolyte
Or clear water carries out just molten pulp to filter cake, then with sulfuric acid dissolution, finally pH value remove impurity is adjusted back with lime cream, final ph is 3.8-
4.0.Step 14, the serosity of step 13 is introduced agitator tank carry out three remove impurity and process, be stirred for adding sodium carbonate liquid dense in groove
Spend and be stirred removing Fe, Al, Si etc. for 5%-8%, final ph is 4.8-5.0.Step 15, the serosity to step 14 are utilized
Pressure filter carries out filter pressing, pulp filter cake is obtained and filtrate enters subsequent processing.Step 16, the filtrate of step 15 is introduced into extraction box
Add P204 organic faciess, liquid caustic soda, sulphuric acid and hydrochloric acid to carry out deep impurity-removing, remove the impurity such as Fe, Ca, Zn, Mn.Step 17, will step
Rapid 16 extract introduces extraction box and adds the extract of P507 organic faciess to carry out deep impurity-removing, removes Fe, Ca, Zn, Mn, Mg miscellaneous
Matter, wherein, liquid caustic soda is first imported in anti-cobalt liquid carries out heavy cobalt, and final ph is 7.5-8, and final ph is 7.5-8, recycles pressure
Filter carries out filter pressing and obtains cobalt hydroxide.Step 18, the extract of step 17 is introduced agitator tank, adds the sodium carbonate liquid concentration to be
5%-8% carries out secondary heavy nickel and processes, and final ph is 7.8-8.2.Step 19, the filtrate to step 18 are carried out using pressure filter
Filter pressing obtains filter cake nickel hydroxide.Step 20, nickel hydroxide obtained in step 19 inserted slurrying tank carry out the molten process of quadratic acid,
Wherein, well water and concentrated sulphuric acid is added to carry out acid molten, first with anolyte just molten pulp, then with sulfuric acid dissolution, final ph is 2.5-
3.Step 21, recycling pressure filter carry out filter pressing to the serosity of step 20, and pulp filter cake and filtrate is obtained；Step 22, to step
21 filtrate is carried out with liquid process, adds boric acid, liquid caustic soda, anhydrous sodium sulfate and activated carbon, and final ph is 4.8-5.Step 23,
The filtrate of step 15, the pulp filter cake of step 21 and step 22 is carried out into filtration treatment, acid adjustment, heat treatment is carried out, the moon is obtained
Pole liquid, by filtrate pH value 2-4 is modulated to, and acid liquor temperature is heated to be into 50 DEG C -70 DEG C using vapour heating.Step 24, by step
23 catholyte is introduced in electrolysis bath, adds anolyte and nickelic pure nickel water, logical unidirectional current to carry out electrolysis process, and nickel plate is obtained.
Embodiment three
The present invention as shown in Figure 1 provides a kind of method for preparing recovery noble metal for pickling sludge, including following step
Suddenly, step 1, industry water blender stirring pulping will be added after pickling sludge raw material pulverizing first, then by pickling sludge serosity
Introducing concentrator is settled, concentration, wherein, the pickling sludge serosity of overflow in concentrator is introduced back into blender.Step
Rapid 2, to the pickling sludge bottom slurry in concentrator, aqueous concentration is 12%-14%, and introducing homogenization groove carries out transfer, dispensing,
Wherein, anhydrous sodium sulfate, hydrogen peroxide is added to be mixed.Step 3, leaching, by the pickling sludge mixing slurry of step 2
Liquid introduces agitator tank, and the valuable metals such as Ni, Co are leached, and adds nickeliferous sour water and concentrated sulphuric acid, is leached using steam heating,
Wherein, pickling sludge mixed serum final ph is 1.6-1.8.Step 4, a remove impurity, by step 3pH value for 1.7-1.9's
Pickling sludge mixed serum introduces agitator tank, and the precipitation such as ferric ion, Al, Cr, Si is removed, and adds hydrogen peroxide, nickeliferous acid
Wash and stirred after mud and lime cream, leached using steam heating, wherein, pickling sludge mixed serum final ph is
3.9-4.Step 5, filter pressing process is carried out to the pickling sludge mixed serum of step 4 using pressure filter.Step 6, first to step 5
Filter cake tailings be dried brickmaking process, then obtained brick is melted by smelting furnace, using aerator air blast, its
In, add coke, white residue and limestone to carry out melting in smelting furnace, gained molten iron is ferroalloy, and gained slag sends into rock wool
Stove carries out producing rock wool, and waste gas utilization water film dedusting is processed, and residue is granulated slag in smelting furnace and cotton processed.Step 7, step
Brickmaking machine is again introduced in 6 into a part of dust of water film dedusting to be processed, another part adds lime cream to carry out at desulfurization
Reason, produced gas emptying, produced slurry Jing is filtered and gypsum filter cake is obtained.Step 8, the filtrate of step 5 is drawn first
Enter agitator tank, add hydrogen peroxide and lime cream to carry out secondary remove impurity, further go the precipitation such as ferric ion, Al, Cr, Si
Remove, wherein, pickling sludge mixed serum final ph is 5.2-5.4.Step 9, by step 8 pickling sludge mixed serum introduce it is dense
Close machine is settled, separating treatment, wherein, bottom liquid is back to step 3 and processes.Step 10, in overflowing liquid in step 9 introduce stir
Mix groove add liquid caustic soda once sunk nickel process, wherein, overflowing liquid final ph be 7.9-8.1.Step 11, overflowing step 10
Flow liquid introduce concentrator, then by obtained by nickel hydroxide and well water serosity introduce concentrator settled, separating treatment.Step
12nd, the underflow of step 11 is carried out into filter pressing process using pressure filter, filter cake nickel hydroxide is obtained.Step 13, step 12 is obtained
Nickel hydroxide insert slurrying tank and carry out the molten process of a subacid, wherein, add well water and concentrated sulphuric acid to carry out acid molten, first use anolyte
Or clear water carries out just molten pulp to filter cake, then with sulfuric acid dissolution, finally pH value remove impurity is adjusted back with lime cream, final ph is 3.8-
4.0.Step 14, the serosity of step 13 is introduced agitator tank carry out three remove impurity and process, be stirred for adding sodium carbonate liquid dense in groove
Spend and be stirred removing Fe, Al, Si etc. for 5%-8%, final ph is 4.8-5.0.Step 15, the serosity to step 14 are utilized
Pressure filter carries out filter pressing, pulp filter cake is obtained and filtrate enters subsequent processing.Step 16, the filtrate of step 15 is introduced into extraction box
Add P204 organic faciess, liquid caustic soda, sulphuric acid and hydrochloric acid to carry out deep impurity-removing, remove the impurity such as Fe, Ca, Zn, Mn.Step 17, will step
Rapid 16 extract introduces extraction box and adds the extract of P507 organic faciess to carry out deep impurity-removing, removes Fe, Ca, Zn, Mn, Mg miscellaneous
Matter, wherein, liquid caustic soda is first imported in anti-cobalt liquid carries out heavy cobalt, and final ph is 7.5-8, and final ph is 7.5-8, recycles pressure
Filter carries out filter pressing and obtains cobalt hydroxide.Step 18, the extract of step 17 is introduced agitator tank, adds the sodium carbonate liquid concentration to be
5%-8% carries out secondary heavy nickel and processes, and final ph is 7.9-8.1.Step 19, the filtrate to step 18 are carried out using pressure filter
Filter pressing obtains filter cake nickel hydroxide.Step 20, nickel hydroxide obtained in step 19 inserted slurrying tank carry out the molten process of quadratic acid,
Wherein, well water and concentrated sulphuric acid is added to carry out acid molten, first with anolyte just molten pulp, then with sulfuric acid dissolution, final ph is 2.6-
2.9.Step 21, recycling pressure filter carry out filter pressing to the serosity of step 20, and pulp filter cake and filtrate is obtained；Step 22, to step
Rapid 21 filtrate is carried out with liquid process, adds boric acid, liquid caustic soda, anhydrous sodium sulfate and activated carbon, and final ph is 4.8-5.Step
23rd, the filtrate of step 15, the pulp filter cake of step 21 and step 22 is carried out into filtration treatment, carries out acid adjustment, heat treatment, be obtained
Catholyte, by filtrate pH value 2.5-3.5 is modulated to, and acid liquor temperature is heated to be into 55 DEG C -65 DEG C using vapour heating.Step 24,
The catholyte of step 23 is introduced in electrolysis bath, adds anolyte and nickelic pure nickel water, logical unidirectional current to carry out electrolysis process, be obtained
Nickel plate.
In sum, this is used for the method that pickling sludge prepares recovery noble metal, compared with traditional method, 1：Once sink nickel
Mother solution contains Mg<During 5g/L, it is not necessary to carry out secondary heavy nickel, be directly entered ore dressing water system, use for ore dressing pulp water, when
The nickel mother solution that once sinks contains Mg>During 5g/L, then secondary heavy nickel is carried out except Mg, can so reduce secondary heavy nickel equipment such as concentrator etc.
Usage frequency, can reduce production cost；Cost analyses once sink nickel mother solution 1000m according to daily process3, the available machine time 12 is little
When (pump discharge 100m3/ h) calculate, processing cost is：Calx+power consumption+wage=29.7 yuan/m3, 29740 yuan can be saved daily；
2：Secondary remove impurity operation (without the need for using traditional three time remove impurity operation) is directly carried out after the subacid of nickel hydroxide one is molten, then was carried out
Filter, filtrate enters P204 extracting systems, can so reduce by three remove impurity operations, saves pressure filter and agitator tank, and reduction is produced into
This, following table is result of the test and Cost comparisons' (rough calculation)
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvement can also be made, these improvement also should be regarded as the present invention's
Protection domain.
Claims (2)
- It is 1. a kind of to prepare the method for reclaiming metal for pickling sludge, it is characterised in that：Comprise the following steps,Step 1, industry water blender stirring pulping will be added after pickling sludge raw material pulverizing first, then by pickling sludge slurry Liquid introducing concentrator is settled, concentration, wherein, the pickling sludge serosity of overflow in concentrator is introduced back into blender；Step 2, to the pickling sludge bottom slurry in concentrator, aqueous concentration is 10%-15%, is introduced into during homogenization groove carries out Turn, dispensing, wherein, add anhydrous sodium sulfate, hydrogen peroxide to be mixed；Step 3, leaching, by the pickling sludge mixed serum of step 2 agitator tank is introduced, by the leaching of Ni, Co valuable metal Go out, add nickeliferous sour water and concentrated sulphuric acid, leached using steam heating, wherein, the final pH value of pickling sludge mixed serum For 1.5-2.0；Step 4, a remove impurity, introduce agitator tank, by three by pickling sludge mixed serum of the step 3PH value for 1.5-2.0 Valency iron ion, Al, Cr, Si precipitation are removed, and are added and are stirred after hydrogen peroxide, nickeliferous pickling mud and lime cream, using steam plus Heat is leached, wherein, the final pH value of pickling sludge mixed serum is 3.8-4.2；Step 5, filter pressing process is carried out to the pickling sludge mixed serum of step 4 using pressure filter；Step 6, it is dried brickmaking process to the filter cake tailings of step 5 first, then obtained brick is entered by smelting furnace Row melting, using aerator air blast, wherein, add coke, white residue and limestone to carry out melting in smelting furnace, gained molten iron is Ferroalloy, gained slag sends into rock wool stove and carries out producing rock wool, and waste gas utilization water film dedusting is processed, in smelting furnace and cotton processed Residue is granulated slag；Brickmaking machine is again introduced in step 7, step 6 into a part of dust of water film dedusting to be processed, another part is added Lime cream carries out desulfurization process, and produced gas emptying, produced slurry Jing is filtered and gypsum filter cake is obtained；Step 8, first agitator tank is introduced to the filtrate of step 5, add hydrogen peroxide and lime cream to carry out secondary remove impurity, enter one Step removes ferric ion, Al, Cr, Si precipitation, wherein, pickling sludge mixed serum final ph is 5-5.5；Step 9, by step 8 pickling sludge mixed serum introducing concentrator settled, separating treatment, wherein, bottom liquid backflow Process to step 3；Step 10, the nickel that once sunk to introducing agitator tank addition liquid caustic soda in overflowing liquid in step 9 are processed, wherein, overflowing liquid Final pH value is 7.8-8.2；Step 11, the overflowing liquid of step 10 is introduced concentrator, then serosity obtained by nickel hydroxide and well water is introduced into dense Machine is settled, separating treatment；Step 12, the underflow of step 11 is carried out into filter pressing process using pressure filter, filter cake nickel hydroxide is obtained；Step 13, nickel hydroxide obtained in step 12 is inserted slurrying tank carry out the molten process of a subacid, wherein, add well water It is molten acid to be carried out with concentrated sulphuric acid；Step 14, the serosity of step 13 is introduced agitator tank carry out three remove impurity and process, be stirred for adding sodium carbonate liquid in groove Concentration is stirred removing Fe, Al, Si for 5%-8%, and final pH value is 4.8-5.0；Step 15, the serosity to step 14 carry out filter pressing using pressure filter, pulp filter cake is obtained and filtrate enters next work Sequence；Step 16, the filtrate of step 15 is introduced extraction box add P204 organic faciess, liquid caustic soda, sulphuric acid and hydrochloric acid to carry out depth Degree remove impurity, removes Fe, Ca, Zn, Mn impurity；Step 17, the extract of step 16 introduced extraction box add the extract of P507 organic faciess to carry out deep impurity-removing, Fe, Ca, Zn, Mn, Mg impurity is removed, wherein, liquid caustic soda is imported first in anti-cobalt liquid carries out heavy cobalt, and final pH value is 7.5-8, recycles pressure filter to carry out filter pressing and obtains cobalt hydroxide；Step 18, the extract of step 17 is introduced agitator tank, adds sodium carbonate liquid concentration to carry out secondary heavy nickel for 5%-8% Process, final pH value is 7.8-8.2；Step 19, the filtrate to step 18 carry out filter pressing and obtain filter cake nickel hydroxide using pressure filter；Step 20, nickel hydroxide obtained in step 19 is inserted slurrying tank carry out the molten process of quadratic acid, wherein, add well water Acid is carried out with concentrated sulphuric acid molten, first with anolyte just molten pulp, then with sulfuric acid dissolution, final pH value is 2.5-3；Step 21, recycling pressure filter carry out filter pressing to the serosity of step 20, and pulp filter cake and filtrate is obtained；Step 22, the filtrate to step 21 are carried out with liquid process, add boric acid, liquid caustic soda, anhydrous sodium sulfate and activated carbon, most Whole pH values are 4.8-5；Step 23, the filtrate of step 15, the pulp filter cake of step 21 and step 22 is carried out into filtration treatment, adjusted Acid, heat treatment, are obtained catholyte, wherein, filtrate pH values are modulated to into 2.5-3.5 when acid adjustment, heating, using steam plus Wen JiangAcid liquor temperature is heated to be 55 DEG C -65 DEG C；Step 24, the catholyte of step 23 is introduced in electrolysis bath, adds anolyte and nickelic pure nickel water, logical unidirectional current to enter Row electrolysis is processed, and nickel plate is obtained.
- 2. according to claim 1 it is a kind of for pickling sludge prepare reclaim metal method, it is characterised in that：It is described In step 13, just molten pulp is first carried out to filter cake with anolyte or clear water, then with sulfuric acid dissolution, finally adjusted back with lime cream PH value remove impurity, final pH value is 3.8-4.0.
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| CN103695655A (en) * | 2014-01-10 | 2014-04-02 | 王洪 | Method for recycling precious metals from stainless steel acid pickling sludge |
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| CN103695655A (en) * | 2014-01-10 | 2014-04-02 | 王洪 | Method for recycling precious metals from stainless steel acid pickling sludge |
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