CN107574303A - A kind of method of hydrazine hydrate reduction automobile spent catalyst - Google Patents
A kind of method of hydrazine hydrate reduction automobile spent catalyst Download PDFInfo
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- CN107574303A CN107574303A CN201611020803.9A CN201611020803A CN107574303A CN 107574303 A CN107574303 A CN 107574303A CN 201611020803 A CN201611020803 A CN 201611020803A CN 107574303 A CN107574303 A CN 107574303A
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- spent catalyst
- hydrazine hydrate
- activation
- wet
- automobile spent
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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
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Abstract
The present invention provides a kind of method of hydrazine hydrate reduction automobile spent catalyst, this method proposes that the hydrazine hydrate that 2%~5% is added when crushing automobile spent catalyst is ground to 0.074~0.106mm together, automobile spent catalyst is set to be reduced and be handled while crushing, then leached 2~6 hours at 60~100 DEG C with dilute chloroazotic acid, the dissolution rate of platinum can be effectively improved.Platinum group metal leaching rate is（%）：Pt23, Pd27, Rh51, average slag rate reach 64.83%.Recovery value is very high, is appropriate for marketing.
Description
Technical field
The present invention relates to a kind of spent automotive exhaust catalysts preconditioning technique, more particularly to a kind of hydrazine hydrate reduction automobile
The method of spent catalyst.
Background technology
Platinum group metal is enriched with from automobile spent catalyst using wet method, the rate of recovery of platinum, palladium especially rhodium can not usually make
People is satisfied with, and often has 10%~15% variation, and to new cars catalyst platinum family metal recovery rate is often 98%~99%, and its reason can
Use Al2O3It is changed into δ-Al2O3, it is changed into θ-Al again at 1040 DEG C2O3, finally it is changed into α-Al more than 1150 DEG C2O3。α-
Al2O3Insoluble in HCl, in H2SO4Middle dissolving is slow.Vehicle exhaust converter during catalytic action, platinum group metal particulate with
Permanent motion mode is in Al2O3Passed in and out in matrix, some particulates can reach more than 1150 DEG C of temperature, make the γ-Al around it2O3
It is changed into α-Al2O3, by γ-Al during cooling2O3Wrapped up, leachate can not possibly be with γ-Al2O3The platinum group metal of parcel acts as
With preventing leaching.The factor from spent catalyst recovery platinum group metal is influenceed to also have：Metallic particles heat-agglomerating, matrix burn
Glaze on knot, metal surface generates insoluble platinum family metal sulfide and phosphide etc..
In order to improve the leaching rate of platinum group metal, the invention provides a kind of side of hydrazine hydrate reduction automobile spent catalyst
Method, palladium leaching rate is up to 96.96%, and lead leaching rate is up to 98.34%, and the leaching rate of rhodium is up to more than 82.03%.
The content of the invention
It is an object of the invention to provide a kind of method of hydrazine hydrate reduction automobile spent catalyst, to automobile spent catalyst
Reduction treatment is carried out while crushing, reaction is promoted, improves leaching rate.
To realize above-mentioned purpose, the technical solution adopted by the present invention is：
Step 1：Automobile spent catalyst is crushed to raw materials of the 0.074~0.106mm as wet-leaching；
Step 2：The first wet-process activation in a kettle of raw material that step 1 is obtained, activator hydrazine hydrate addition 2%~5%, solid-liquid
Than（S/L）=6:1~1:6,60~100 DEG C of activation temperature, 2~6h of soak time；
Step 3：The press filtration activation slag after step 2 reaction terminates；
Step 4：The activation slag that step 3 is obtained returns to reactor wet-leaching, leaches 6~10mol/L of acidity, solid-to-liquid ratio（S/
L）=10:1~1:10,80~100 DEG C, 8~12h of extraction time, oxidant H of extraction temperature2O2Dosage is 1%~50%, is leached
The change of solution potential is detected in journey with potentiometer；
Step 5：After step 4 reaction terminates, using filter press press filtration, leached mud is obtained.
Beneficial effect：Make automobile spent catalyst add hydrazine hydrate while crushing to be reduced and handled, add dilute
Chloroazotic acid leaches, and can improve the dissolution rate of platinum, average slag rate reaches 64.83%, and platinum family leached mud rate then reaches：Pt：96.96%、
Pd：98.34%th, Rh82.03, yield good result.
Brief description of the drawings
Nothing.
Embodiment
In order that technological means, creation characteristic, reached purpose and effect of the present invention are easy to understand, with reference to tool
Body embodiment, is expanded on further the present invention.
We use method disclosed by the invention, carry out following operate：
（1）Automobile spent catalyst is crushed to raw materials of the 0.074~0.106mm as wet-leaching；
（2）Will（1）The obtained first wet-process activation in a kettle of raw material, activator hydrazine hydrate addition 2%~5%, solid-to-liquid ratio（S/
L）=6:1~1:6,60~100 DEG C of activation temperature, 2~6h of soak time；
（3）Treat（2）Reaction terminates rear press filtration activation slag；
（4）Will（3）Obtained activation slag returns to reactor wet-leaching, leaches 6~10mol/L of acidity, solid-to-liquid ratio（S/L）=10:
1~1:10,80~100 DEG C, 8~12h of extraction time, oxidant H of extraction temperature2O2Dosage is 1%~50%, is used in leaching process
Potentiometer detects the change of solution potential；
（5）Treat（4）After reaction terminates, using filter press press filtration, leached mud is obtained.
As a result show, leaching slag ingredient is（g/t）：Pt23, Pd27, Rh51, average slag rate reach 64.83%.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all think ofs in the present invention
Want with any modification, equivalent substitution and improvements within principle, done etc., it should be included in the scope of the protection.
Claims (3)
- A kind of 1. method of hydrazine hydrate reduction automobile spent catalyst, it is characterised in that comprise the following steps：Step 1：Automobile spent catalyst is crushed to raw materials of the 0.074~0.106mm as wet-leaching；Step 2：The first wet-process activation in a kettle of raw material that step 1 is obtained, activator hydrazine hydrate addition 2%~5%, solid-liquid Than（S/L）=6:1~1:6,60~100 DEG C of activation temperature, 2~6h of soak time；Step 3：The press filtration activation slag after step 2 reaction terminates；Step 4：The activation slag that step 3 is obtained returns to reactor wet-leaching, leaches 6~10mol/L of acidity, solid-to-liquid ratio（S/ L）=10:1~1:10,80~100 DEG C, 8~12h of extraction time, oxidant H2O2 dosages of extraction temperature are 1%~50%, are leached The change of solution potential is detected in journey with potentiometer；Step 5：After step 4 reaction terminates, using filter press press filtration, leached mud is obtained.
- 2. the method for hydrazine hydrate reduction automobile spent catalyst as described in claim 1, its feature include：Will in step 2 The first wet-process activation in a kettle of raw material that step 1 obtains, activator hydrazine hydrate addition 2%~5%, solid-to-liquid ratio（S/L）=6:1 ~1:6,60~100 DEG C of activation temperature, 2~6h of soak time.
- 3. the method for hydrazine hydrate reduction automobile spent catalyst as described in claim 1, its feature include：Will in step 4 The activation slag that step 3 obtains returns to reactor wet-leaching, leaches 6~10mol/L of acidity, solid-to-liquid ratio（S/L）=10:1~1: 10,80~100 DEG C, 8~12h of extraction time, oxidant H2O2 dosages of extraction temperature are 1%~50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611020803.9A CN107574303A (en) | 2016-11-21 | 2016-11-21 | A kind of method of hydrazine hydrate reduction automobile spent catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201611020803.9A CN107574303A (en) | 2016-11-21 | 2016-11-21 | A kind of method of hydrazine hydrate reduction automobile spent catalyst |
Publications (1)
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| CN107574303A true CN107574303A (en) | 2018-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611020803.9A Pending CN107574303A (en) | 2016-11-21 | 2016-11-21 | A kind of method of hydrazine hydrate reduction automobile spent catalyst |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103526034A (en) * | 2013-10-21 | 2014-01-22 | 昆明贵研催化剂有限责任公司 | Method for activating and leaching platinum group metals from automobile spent catalysts by wet method |
| CN104178634A (en) * | 2014-08-19 | 2014-12-03 | 昆明贵金属研究所 | Method for efficiently and cleanly recovering platinum group metals from spent automobile catalyst |
| CN104831073A (en) * | 2015-05-04 | 2015-08-12 | 昆明正江工贸有限责任公司 | Technology for recovering platinum, palladium and rhodium from spent auto-catalyst |
-
2016
- 2016-11-21 CN CN201611020803.9A patent/CN107574303A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103526034A (en) * | 2013-10-21 | 2014-01-22 | 昆明贵研催化剂有限责任公司 | Method for activating and leaching platinum group metals from automobile spent catalysts by wet method |
| CN104178634A (en) * | 2014-08-19 | 2014-12-03 | 昆明贵金属研究所 | Method for efficiently and cleanly recovering platinum group metals from spent automobile catalyst |
| CN104831073A (en) * | 2015-05-04 | 2015-08-12 | 昆明正江工贸有限责任公司 | Technology for recovering platinum, palladium and rhodium from spent auto-catalyst |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180112 |
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| WD01 | Invention patent application deemed withdrawn after publication |