CN106636651A - Method for separating chromium from iron and aluminum in sulfuric acid system solution containing chromium, iron and aluminum - Google Patents
Method for separating chromium from iron and aluminum in sulfuric acid system solution containing chromium, iron and aluminum Download PDFInfo
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- CN106636651A CN106636651A CN201611167725.5A CN201611167725A CN106636651A CN 106636651 A CN106636651 A CN 106636651A CN 201611167725 A CN201611167725 A CN 201611167725A CN 106636651 A CN106636651 A CN 106636651A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B21/00—Obtaining aluminium
- C22B21/0015—Obtaining aluminium by wet processes
- C22B21/0023—Obtaining aluminium by wet processes from waste materials
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B34/00—Obtaining refractory metals
- C22B34/30—Obtaining chromium, molybdenum or tungsten
- C22B34/32—Obtaining chromium
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- 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 hydrometallurgy and relates to a method for separating chromium from iron and aluminum in a sulfuric acid system solution containing the chromium, the iron and the aluminum. The method comprises steps as follows: (1) an oxidizing agent is added for pretreatment; (2) the solution is adjusted to have the specific pH value, phosphate is added, a reaction is conducted at the specific temperature, and iron and aluminum phosphate composite precipitate mainly comprising iron phosphate and a filtrate are obtained; (3) the filtrate is adjusted to have the specific pH value, the phosphate is added again, a reaction is conducted at the specific temperature, iron and aluminum phosphate composite precipitate mainly comprising aluminum phosphate and a chromium sulfate solution are obtained, and the chromium is separated from the iron and the aluminum. The method is short in process, simple to operate and easy to apply in a large scale; the method of step-by-step precipitation with phosphate is adopted, the selectivity is relatively high, and the separating effect is relatively ideal; the recovery rate of the metal chromium is larger than 98%, and the economic benefit is remarkable; and chemical substances which can cause damage to the environment are not used in the whole separating process, and the environmental protection requirements are met.
Description
Technical field
The invention belongs to technical field of wet metallurgy, it is related to chromium and ferrum aluminum in a kind of sulfuric acid system solution containing ferrochrome aluminum
The substep selective separation method of chromium and ferrum aluminum in separation method, more particularly to a kind of electroplating sludge sulphuric leachate.
Background technology
During electric plating sludge resource is utilized, sulphuric acid is a kind of conventional hydrometallurgy leaching solvent, its leaching
Efficiency high, leaching effect is good, thus uses extensive.Sulfuric acid leaching uses PAC (aluminium polychlorid) as flocculant, and formation contains
Chromic sulfate, aluminum sulfate, the mixed solution of ferrous sulfate.Due to the atomic radius of chromium, ferrum, three kinds of elements of aluminum it is close, chemical property
It is similar, therefore there is a problem of separating difficulty.
The separation method of chromium and ferrum mainly includes following several in the sulfuric acid system developed at present：(1) solvent extraction：
The method has the features such as equipment is simple, process is easily controllable and reagent can be recycled, Jing phosphine extractants (as P204,
P507) extract, although the extraction yield of ferrum is up to more than 99%, but the coextraction rate of chromium is also up to 25%, and separating effect is not good,
Chromium loss is obvious；(2) Mohr's salt crystallization process：The method is based on the reaction of ferrous sulfate, chromic sulfate and ammonium sulfate, the chromic ammonium alum of generation
There is obvious dissolubility difference with ferrous ammonium alum, ferrous ammonium alum crystallization is separated out, and chromium is then stopped in the solution, reaches separation chromium
The purpose of ferrum, and the loss rate of chromium is relatively low, but the method complex procedures, operate and require strictly, to be difficult heavy industrialization
Using；(3) the Ferrox. sedimentation method：The method is based on the low principle of Ferrox. solubility product, by adding oxalic acid come precipitated iron
Element, to reach the purpose for separating chromium and ferrum, but except ferrum rate is extremely sensitive for factors such as oxalic acid additions and temperature, operates
Require strictly, and preferably pH value in reaction is about 4.0, it is big with load in initial soln, it is not easy to large-scale promotion and uses；
(4) goethite process：The method is from mixed solution except ferrum and reclaiming chromium, although except ferrum rate is up to 99%, but the loss rate of chromium
Also it is higher, about 15%；(5) the heavy chromium method of phosphate：The method is realized based on chromium phosphate with the dissolubility difference of ferrous phosphate
Chromium with ferrous iron separate, although be capable of achieving 98% chromium recovery ratio, but reaction need heating, and product be chromium phosphate with
The complex precipitate of chromic oxide gel, subsequently needs regeneration.
The chromium developed at present and the separation method of aluminum are mainly by being sexavalence by trivalent chromium oxidation in the basic conditions
Chromium, and aluminum is then in the form of meta-aluminate, plus acid for adjusting pH value is to 8.0, aluminum can in the form of aluminum hydroxide precipitation reality
Now separate with ionic state chromium.
The Chinese invention patent of Application No. 200710041574.3 discloses a kind of phosphate stabilizing of electroplating sludge
Processing method, its key step is as follows：(1) by 102 DEG C of drying of electroplating sludge Jing, powder is then ground to, it is standby；(2) 30～
In 70 DEG C of temperature ranges, analytically pure soluble phosphate is pressed into 1 with above-mentioned electroplating sludge:70～90 part by weight mixing,
And in blender strong stirring 4 hours so as to fully reaction, control ph is in the range of 8～11 in course of reaction；(3) it is anti-
After should terminating, natural cooling obtains the sewage sludge solid sample containing heavy metal composite phosphate, and test shows that the sludge can reach
The hazard waste landfill standard of national regulation.However, the method is only the stabilizing treatment of electroplating sludge, it is not carried out valuable
The recycling of metal.
The Chinese invention patent of Application No. 201310008199.8 discloses chromium and ferrum in a kind of sulfuric acid system solution
Selective separation method, its key step is as follows：(1) in the sulfuric acid system solution containing chromium and ferrum, reducing agent is added to carry out pre-
Process；(2) solution ph is adjusted；(3) add soluble phosphate, carry out the heavy chromium reaction of selectivity phosphoric acid, formed chromium phosphate with
The complex precipitate of chromic oxide gel；(4) it is separated by filtration, obtains chromium phosphate chromic oxide gel complex precipitate and sulfur acid is ferrous
Solution, realizes ferrochrome Selective Separation.Although the method can realize more than 98% chromium recovery ratio, but applicable chromium ion
Concentration relatively low (0.1～30g/L), causes treatment scale larger, it is difficult to heavy industrialization application.
The content of the invention
For above-mentioned problems of the prior art, the present invention is intended to provide a kind of technological process is short, simple to operate, ring
Border is friendly, be easy to the substep selective separation method of chromium and ferrum aluminum in the sulfuric acid system solution containing ferrochrome aluminum of large-scale application.
Specifically, the present invention is adopted the following technical scheme that：
The separation method of chromium and ferrum aluminum in a kind of sulfuric acid system solution containing ferrochrome aluminum, it comprises the steps：
1) to containing Cr3+、Fe2+、Al3+Sulfuric acid system solution in add oxidant, until chromium, ferrum, the aluminium element in solution
Respectively only with Cr3+、Fe3+、Al3+Form is present；
2) to step 1) in solution in add alkali liquor, until pH=1～3, according to the ferrum in phosphate anion and solution
The mol ratio of ion and aluminium ion sum is 0.2～0.7:1 ratio, adds soluble phosphate, and under the conditions of 5～60 DEG C
Insulated and stirred, iron phosphate aluminum composite precipitation and the filtrate being filtrated to get based on iron phosphate；
3) to step 2) in filtrate in add alkali liquor, until pH=2～4, according to the aluminum in phosphate anion and filtrate
The mol ratio of ion is 0.6～1.6:1 ratio, adds soluble phosphate, and insulated and stirred, mistake under the conditions of 5～60 DEG C
Filter obtains iron phosphate aluminum composite precipitation and the chromium sulfate solution based on aluminum phosphate, in completing the sulfuric acid system solution containing ferrochrome aluminum
Chromium is separated with ferrum aluminum.
In above-mentioned separation method, step 1) described in contain Cr3+、Fe2+、Al3+Sulfuric acid system solution be electroplating sludge sulfur
Acid leaching liquor.
In above-mentioned separation method, step 1) described in contain Cr3+、Fe2+、Al3+Sulfuric acid system solution in Cr3+Quality
Concentration is 10～80g/L, Fe2+Mass concentration be 0.5～4g/L, Al3+Mass concentration be 0.5～4g/L.
In above-mentioned separation method, step 1) described in oxidant be containing Cr6+Waste liquid.Using Cr6+With Fe2+Between
Redox reaction, not only can be by the Fe in sulfuric acid system solution2+It is oxidized to Fe3+, while can be by the Cr in industrial wastes6 +It is reduced into Cr3+, subsequently together with the Cr in sulfuric acid system solution3+Subsequent selective separation is carried out together.
In above-mentioned separation method, step 2) described in alkali liquor be sodium hydroxide or potassium hydroxide saturated aqueous solution.
In above-mentioned separation method, step 2) described in soluble phosphate be sodium phosphate or potassium phosphate.
In above-mentioned separation method, step 2) described in the linear velocity that stirs be 50～400m/min, the time is 5～
120min。
In above-mentioned separation method, step 3) described in alkali liquor be sodium hydroxide or potassium hydroxide saturated aqueous solution.
In above-mentioned separation method, step 3) described in soluble phosphate be sodium phosphate or potassium phosphate.
In above-mentioned separation method, step 3) described in the linear velocity that stirs be 50～400m/min, the time is 5～
120min。
The separation method of the present invention make use of Cr3+、Fe3+、Al3+Each self-corresponding phosphatic dissolubility difference, realizes
The Selective Separation of chromium and ferrum aluminum in sulfuric acid system solution.Due to CrPO4·2H2The solubility product (Ksp) of O is 2.4 × 10-23,
FePO4·2H2The solubility product of O is 9.9 × 10-16, AlPO4Solubility product be 6.3 × 10-19, therefore by adjusting pH value and temperature
Degree, the processing step such as carry out chemical precipitation reaction, be separated by filtration and can obtain iron phosphate aluminum composite precipitation and chromium sulfate solution, it is real
The final separation of existing chromium and ferrum aluminum.
Compared by prior art, there is advantages below using the present invention of above-mentioned technical proposal：
(1) technological process is short, simple to operate, low cost, it is easy to accomplish heavy industrialization application；
(2) using phosphate fractional precipitation ferrum and aluminum, there can be stronger selection in wider ion concentration range
Property and comparatively ideal separating effect；
(3) crome metal in sulfuric acid system solution obtains efficient recovery, and the response rate is more than 98%, remarkable in economical benefits；
(4) chromyl industrial wastes can be used in the preprocessing process of sulfuric acid system solution as oxidant, both
The secondary utilization of achievable high price chromium waste liquid, can in the lump reclaim the chromium in high price chromium waste liquid again, kill two birds with one stone；
(5) whole separation process is not used the chemical substance that may be worked the mischief to environment, meets the requirement of environmental protection.
Specific embodiment
Further elucidated above is made to technical scheme below in conjunction with specific embodiment.Unless otherwise saying
Bright, instrument, material and reagent used in the following example etc. can be obtained by routine business means.
Embodiment 1：The separation of chromium and ferrum aluminum in sulfuric acid system solution containing ferrochrome aluminum.
(1) to sulfuric acid system solution (the wherein Cr containing ferrochrome aluminum3+Mass concentration be 49.3g/L, Fe2+Mass concentration
For 2.1g/L, Al3+Mass concentration be 2.13g/L) in add contain Cr6+Waste liquid, by redox reaction by Fe2+Oxidation
Into Fe3+, while by Cr6+It is reduced into Cr3+, until the chromium, ferrum, aluminium element in mixed solution is respectively only with Cr3+、Fe3+、Al3+Shape
Formula is present；
(2) saturation sodium hydroxide solution is added in the mixed solution in step (1), until pH=2.0, according to n
(PO4 3-):n(Fe2++Al3+)=0.5:1 mol ratio, adds sodium phosphate, and insulated and stirred 10min under the conditions of 5 DEG C, stirring
Wire velocity control is in 150m/min, iron phosphate aluminum composite precipitation and the filtrate being filtrated to get based on iron phosphate；After testing, filtrate
Middle Cr3+、Fe3+、Al3+Mass concentration be respectively 48.8g/L, 0.2g/L, 1.4g/L；
(3) saturation sodium hydroxide solution is added in the filtrate in step (2), until pH=3.0, according to n (PO4 3-):n
(Al3+)=1.2:1 mol ratio, adds sodium phosphate, and insulated and stirred 10min under the conditions of 5 DEG C, stirring wire velocity control to exist
150m/min, iron phosphate aluminum composite precipitation and the chromium sulfate solution being filtrated to get based on aluminum phosphate；After testing, Cr in filtrate3+、
Fe3+、Al3+Mass concentration be respectively 48.4g/L, 0.003g/L, 0.141g/L.
Through the operation of above-mentioned 3 step, the chromium and ferrum aluminum in the sulfuric acid system solution containing ferrochrome aluminum is realized and efficiently separated, wherein
Chromium mainly dissolves in the solution in chromic sulfate form, and chromium recovery ratio is 98.16%；Ferrum element mainly by being with iron phosphate
Main iron phosphate aluminum composite precipitation is reclaimed, and iron recovery is 99.85%；Aluminium element is mainly by the phosphorus based on aluminum phosphate
Sour ferrum aluminum composite precipitation is reclaimed, and aluminium recovery is 93.38%.
Embodiment 2：The separation of chromium and ferrum aluminum in sulfuric acid system solution containing ferrochrome aluminum.
(1) to sulfuric acid system solution (the wherein Cr containing ferrochrome aluminum3+Mass concentration be 30g/L, Fe2+Mass concentration be
1.29g/L, Al3+Mass concentration be 1.25g/L) in add contain Cr6+Waste liquid, by redox reaction by Fe2+It is oxidized to
Fe3+, while by Cr6+It is reduced into Cr3+, until the chromium, ferrum, aluminium element in mixed solution is respectively only with Cr3+、Fe3+、Al3+Form
Exist；
(2) saturation sodium hydroxide solution is added in the mixed solution in step (1), until pH=2.1, according to n
(PO4 3-):n(Fe2++Al3+)=0.53:1 mol ratio, adds sodium phosphate, and insulated and stirred 8min under the conditions of 10 DEG C, stirring
Wire velocity control is in 200m/min, iron phosphate aluminum composite precipitation and the filtrate being filtrated to get based on iron phosphate；After testing, filtrate
Middle Cr3+、Fe3+、Al3+Mass concentration be respectively 29.6g/L, 0.11g/L, 0.63g/L；
(3) saturation sodium hydroxide solution is added in the filtrate in step (2), until pH=3.3, according to n (PO4 3-):n
(Al3+)=1:1 mol ratio, adds sodium phosphate, and insulated and stirred 8min under the conditions of 10 DEG C, stirring wire velocity control to exist
200m/min, iron phosphate aluminum composite precipitation and the chromium sulfate solution being filtrated to get based on aluminum phosphate；After testing, Cr in filtrate3+、
Fe3+、Al3+Mass concentration be respectively 29.4g/L, 0.002g/L, 0.065g/L.
Through the operation of above-mentioned 3 step, the chromium and ferrum aluminum in the sulfuric acid system solution containing ferrochrome aluminum is realized and efficiently separated, wherein
Chromium mainly dissolves in the solution in chromic sulfate form, and chromium recovery ratio is 98.15%；Ferrum element mainly by being with iron phosphate
Main iron phosphate aluminum composite precipitation is reclaimed, and iron recovery is 99.84%；Aluminium element is mainly by the phosphorus based on aluminum phosphate
Sour ferrum aluminum composite precipitation is reclaimed, and aluminium recovery is 94.8%.
Embodiment 3：The separation of chromium and ferrum aluminum in sulfuric acid system solution containing ferrochrome aluminum.
(1) to sulfuric acid system solution (the wherein Cr containing ferrochrome aluminum3+Mass concentration be 10.5g/L, Fe2+Mass concentration
For 0.56g/L, Al3+Mass concentration be 0.51g/L) in add contain Cr6+Waste liquid, by redox reaction by Fe2+Oxidation
Into Fe3+, while by Cr6+It is reduced into Cr3+, until the chromium, ferrum, aluminium element in mixed solution is respectively only with Cr3+、Fe3+、Al3+Shape
Formula is present；
(2) saturation potassium hydroxide solution is added in the mixed solution in step (1), until pH=1.0, according to n
(PO4 3-):n(Fe2++Al3+)=0.2:1 mol ratio, adds potassium phosphate, and insulated and stirred 20min under the conditions of 30 DEG C, stirring
Wire velocity control is in 400m/min, iron phosphate aluminum composite precipitation and the filtrate being filtrated to get based on iron phosphate；After testing, filtrate
Middle Cr3+、Fe3+、Al3+Mass concentration be respectively 10.25g/L, 0.06g/L, 0.26g/L；
(3) saturation potassium hydroxide solution is added in the filtrate in step (2), until pH=2.0, according to n (PO4 3-):n
(Al3+)=1.2:1 mol ratio, adds sodium phosphate, and insulated and stirred 20min under the conditions of 30 DEG C, stirring wire velocity control to exist
400m/min, iron phosphate aluminum composite precipitation and the chromium sulfate solution being filtrated to get based on aluminum phosphate；After testing, Cr in filtrate3+、
Fe3+、Al3+Mass concentration be respectively 10.29g/L, 0.001g/L, 0.046g/L.
Through the operation of above-mentioned 3 step, the chromium and ferrum aluminum in the sulfuric acid system solution containing ferrochrome aluminum is realized and efficiently separated, wherein
Chromium mainly dissolves in the solution in chromic sulfate form, and chromium recovery ratio is 98.03%；Ferrum element mainly by being with iron phosphate
Main iron phosphate aluminum composite precipitation is reclaimed, and iron recovery is 99.82%；Aluminium element is mainly by the phosphorus based on aluminum phosphate
Sour ferrum aluminum composite precipitation is reclaimed, and aluminium recovery is 90.98%.
Embodiment 4：The separation of chromium and ferrum aluminum in sulfuric acid system solution containing ferrochrome aluminum.
(1) to sulfuric acid system solution (the wherein Cr containing ferrochrome aluminum3+Mass concentration be 81.3g/L, Fe2+Mass concentration
For 4.56g/L, Al3+Mass concentration be 4.23g/L) in add contain Cr6+Waste liquid, by redox reaction by Fe2+Oxidation
Into Fe3+, while by Cr6+It is reduced into Cr3+, until the chromium, ferrum, aluminium element in mixed solution is respectively only with Cr3+、Fe3+、Al3+Shape
Formula is present；
(2) saturation potassium hydroxide solution is added in the mixed solution in step (1), until pH=3.0, according to n
(PO4 3-):n(Fe2++Al3+)=0.7:1 mol ratio, adds potassium phosphate, and insulated and stirred 40min under the conditions of 60 DEG C, stirring
Wire velocity control is in 200m/min, iron phosphate aluminum composite precipitation and the filtrate being filtrated to get based on iron phosphate；After testing, filtrate
Middle Cr3+、Fe3+、Al3+Mass concentration be respectively 80.6g/L, 0.42g/L, 2.24g/L；
(3) saturation potassium hydroxide solution is added in the filtrate in step (2), until pH=4.0, according to n (PO4 3-):n
(Al3+)=1.2:1 mol ratio, adds potassium phosphate, and insulated and stirred 40min under the conditions of 60 DEG C, stirring wire velocity control to exist
200m/min, iron phosphate aluminum composite precipitation and the chromium sulfate solution being filtrated to get based on aluminum phosphate；After testing, Cr in filtrate3+、
Fe3+、Al3+Mass concentration be respectively 79.6g/L, 0.01g/L, 0.246g/L.
Through the operation of above-mentioned 3 step, the chromium and ferrum aluminum in the sulfuric acid system solution containing ferrochrome aluminum is realized and efficiently separated, wherein
Chromium mainly dissolves in the solution in chromic sulfate form, and chromium recovery ratio is 97.92%；Ferrum element mainly by being with iron phosphate
Main iron phosphate aluminum composite precipitation is reclaimed, and iron recovery is 99.78%；Aluminium element is mainly by the phosphorus based on aluminum phosphate
Sour ferrum aluminum composite precipitation is reclaimed, and aluminium recovery is 94.18%.
Above-described embodiment is only used for explaining and illustrating specific embodiments of the present invention, and is not intended to limit the present invention's
Protection domain.It should be appreciated that any those familiar with the art presently disclosed technical scope it
The modification or replacement inside made all should be included within the scope of the present invention.
Claims (10)
1. in a kind of sulfuric acid system solution containing ferrochrome aluminum chromium and ferrum aluminum separation method, it comprises the steps：
1) to containing Cr3+、Fe2+、Al3+Sulfuric acid system solution in add oxidant, until chromium, ferrum in solution, aluminium element difference
Only with Cr3+、Fe3+、Al3+Form is present；
2) to step 1) in solution in add alkali liquor, until pH=1～3, according to the iron ion in phosphate anion and solution
It is 0.2～0.7 with the mol ratio of aluminium ion sum:1 ratio, adds soluble phosphate, and is incubated under the conditions of 5～60 DEG C
Stirring, iron phosphate aluminum composite precipitation and the filtrate being filtrated to get based on iron phosphate；
3) to step 2) in filtrate in add alkali liquor, until pH=2～4, according to the aluminium ion in phosphate anion and filtrate
Mol ratio be 0.6～1.6:1 ratio, adds soluble phosphate, and the insulated and stirred under the conditions of 5～60 DEG C, filters
To iron phosphate aluminum composite precipitation and chromium sulfate solution based on aluminum phosphate, complete in the sulfuric acid system solution containing ferrochrome aluminum chromium with
The separation of ferrum aluminum.
2. separation method according to claim 1, it is characterised in that：
Step 1) described in contain Cr3+、Fe2+、Al3+Sulfuric acid system solution be electroplating sludge sulphuric leachate.
3. separation method according to claim 1, it is characterised in that：
Step 1) described in contain Cr3+、Fe2+、Al3+Sulfuric acid system solution in Cr3+Mass concentration be 10～80g/L, Fe2+'s
Mass concentration is 0.5～4g/L, Al3+Mass concentration be 0.5～4g/L.
4. separation method according to claim 1, it is characterised in that：
Step 1) described in oxidant be containing Cr6+Waste liquid.
5. separation method according to claim 1, it is characterised in that：
Step 2) described in alkali liquor be sodium hydroxide or potassium hydroxide saturated aqueous solution.
6. separation method according to claim 1, it is characterised in that：
Step 2) described in soluble phosphate be sodium phosphate or potassium phosphate.
7. separation method according to claim 1, it is characterised in that：
Step 2) described in stir linear velocity be 50～400m/min, the time be 5～120min.
8. separation method according to claim 1, it is characterised in that：
Step 3) described in alkali liquor be sodium hydroxide or potassium hydroxide saturated aqueous solution.
9. separation method according to claim 1, it is characterised in that：
Step 3) described in soluble phosphate be sodium phosphate or potassium phosphate.
10. separation method according to claim 1, it is characterised in that：
Step 3) described in stir linear velocity be 50～400m/min, the time be 5～120min.
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| CN107324303A (en) * | 2017-09-04 | 2017-11-07 | 青川县天运金属开发有限公司 | A kind of method of separation and purification iron, chromium from many metal hazardous wastes |
| CN107419105A (en) * | 2017-07-25 | 2017-12-01 | 盛隆资源再生（无锡）有限公司 | Iron, copper, nickel, the method for chromium in a kind of classification recovery electroplating sludge |
| CN107841627A (en) * | 2017-10-19 | 2018-03-27 | 姚元勋 | The method of disposal of hazardous waste coexists in a kind of more metals |
| CN107871912A (en) * | 2017-09-25 | 2018-04-03 | 湖南邦普循环科技有限公司 | In a kind of used Li ion cell from recovery in leachate caused by valuable metal iron removaling aluminium method |
| CN108706844A (en) * | 2018-05-29 | 2018-10-26 | 重庆太锦环保科技有限公司 | Iron, chromium, the separation and recovery method of aluminium and its application in more metal hazardous wastes |
| CN108950219A (en) * | 2018-04-03 | 2018-12-07 | 东北大学 | A kind of the step extraction and method of comprehensive utilization of titanium white waste acid valuable metal |
| CN109626429A (en) * | 2018-12-07 | 2019-04-16 | 江苏永葆环保科技有限公司 | A kind of comprehensive treatment utilization method of the spent acid containing chromium |
| CN112853102A (en) * | 2020-12-31 | 2021-05-28 | 北京首创环境科技有限公司 | Impurity removal method for recycling nonferrous metals from electroplating sludge by wet method |
| CN112853101A (en) * | 2020-12-31 | 2021-05-28 | 北京首创环境科技有限公司 | Electroplating sludge recycling treatment method |
| CN113924374A (en) * | 2019-04-15 | 2022-01-11 | 诺斯伏特公司 | Method for recovering cathode material in battery recycling |
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