CN1013962B - Process for recovery of platinum catalyst - Google Patents
Process for recovery of platinum catalystInfo
- Publication number
- CN1013962B CN1013962B CN 89102171 CN89102171A CN1013962B CN 1013962 B CN1013962 B CN 1013962B CN 89102171 CN89102171 CN 89102171 CN 89102171 A CN89102171 A CN 89102171A CN 1013962 B CN1013962 B CN 1013962B
- Authority
- CN
- China
- Prior art keywords
- net
- recovery
- platinum
- platinum catalyst
- separation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
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- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The present invention relates to a recovery method of a platinum catalyst in nitric acid manufacture. In the method, a recovery device is tightly placed under a platinum catalyst net of an ammoxidation furnace and is composed of a recovery net, a separation net and a supporting net; the recovery net is knitted with palladium cerium alloy, the separation net and the supporting net are knitted with stainless steel wire, and the nets are orderly ranged at tiny net intervals. The platinum recovery rate can reach 67.18%, and meanwhile, a small quantity of rhodium can be recovered.
Description
The present invention relates to a kind of in nitric acid is made the recovery method and the retrieving arrangement of platinum catalyst.
Industrial production nitric acid is optionally to generate nitrogen protoxide by the platinum catalysis net after ammonia, the air mixed under 780-860 ℃, and oxidation of nitric oxide generates nitrogen peroxide, and nitrogen peroxide is absorbed by water and generates nitric acid.When ammonia oxidation, the platinum catalysis net has loss significantly, and this loss is not recovered utilization, has been lost in a large number.
Since adopting platinum to be the oxidation proceses of ammonia manufacturing nitric acid of catalyzer, people notice the loss problem of catalyzer very soon, and its consumption is only second to the second largest expense of nitrogen raw material, thereby various recovery method produces in succession.According to the recovery method of US4511539 patent disclosure, adopt mechanical means, trapping metals particulate from air-flow, its rate of recovery only is about 20% of platinum loss, and has increased systemic resistance, influences nitric acid output.According to another US4412859, the recovery method of patent disclosure such as US4526614, US2559787, all adopt palladium and palldium alloy thereof in the ammonia oxidation process, to reclaim platinum catalyst, polarium is wherein arranged, porpezite ruthenium alloy, Pd-Ni alloy etc., be woven into net or be bonded into one disorderly with it, to capture platinum, rhodium.The platinum rate of recovery that adopts this method to reclaim is 40-60%.
The objective of the invention is to further improve the rate of recovery of platinum, reduce cost.In the nitric acid manufacturing processed, platinum, rhodium are that the steam with oxide compound is present in the converter for ammonia oxidation, have in the platiniferous air-flow according to palladium and alloy thereof and to reclaim platinum, and the strong more characteristics of the high more recovery ability of the content of platinum, with the palladium is fundamental element, adds an amount of trace element and forms palldium alloy, and the main purpose that adds trace element is to improve alloy mechanical property at high temperature, and don't reduce the ability that reclaims platinum, reduce cost recovery simultaneously.
The present invention is realized by following scheme: in converter for ammonia oxidation catalysis net below tight place one by reclaiming net, separation net, the retrieving arrangement that supporting network is formed, the manufacture craft that wherein reclaims net is: the Ce elements that adds 0-0.2% in the palladium element, become the palladium cerium alloy, this alloy is processed into the silk material that diameter is 0.04-0.5mm through melting, then, make its tensile strength and unit elongation reach the knitmesh requirement through continuous annealing, be woven into the 30-100 purpose and reclaim net, the material of separation net and supporting network then adopts the silk footpath to be the heat-resistance stainless steel silk material of 0.3-0.5mm, be woven into 15-24 purpose net, spacing between each layer net is less than 5mm, the placement of its net is separation net-recovery net-separation net-recovery net-supporting network in proper order, two-layer recovery net is 90 ° of intersections and stacks, three layers of isolation, and supporting network is 120 ° of intersections and stacks.When the temperature of converter for ammonia oxidation constantly raises, solid-state platinum dioxide (P
tO
2), rhodium dioxide (P
hO
2) by the solid-state gaseous state that directly becomes, platinum on the platinum catalysis net is constantly with platinum dioxide, rhodium dioxide gas volatilizees from network, directionally adsorb (physical adsorption) on the net to reclaiming to spread and be recovered net surface, the platinum dioxide that is adsorbed, rhodium dioxide are not to deposit with solid-state platinum dioxide, rhodium dioxide, but are dissociated into platinum and rhodium on the recovery net surface.Through general tracing analysis learning, platinum is to be deposited on metallic state to reclaim on the net, and sedimentary platinum, rhodium solid solution form palladium-platinum-rhodium Solid solution subsequently in palladium, carry out double diffusion between platinum, rhodium and the palladium rapidly, make whole recovery all be covered with platinum, rhodium metal on the net.
The rate of recovery of utilizing the present invention to reclaim the platinum metals is 67.18%.The platinum rate of recovery of delivering than american documentation literature improves 27.18%-7.18%.Adopt the present invention to reclaim the platinum metals and can prop up overfill protection platinum catalysis net better, and can save the operation of on the holder rack, laying silica tube.So promptly save the time that the platinum catalysis net is installed, saved the silica tube and the fixing expense of the used platinum filament of silica tube again:
Test conditions and equipment:
Test is carried out on straight nitre converter for ammonia oxidation, and the converter for ammonia oxidation main technologic parameters is:
Enter the mixture pressure of converter for ammonia oxidation: 26.7KPa
Enter the ammonia amount of converter for ammonia oxidation:＜1500M
3/ h
Ammonia content in the gas mixture: 11.5-12.5%
Oxygen level in the gas mixture: 18-26%
Converter for ammonia oxidation combustion ammonia intensity: 600-800KgNH
3/ day rice
2
Ammonia oxidation rate: 95%
Converter for ammonia oxidation service temperature: 780-860 ℃
Platinum catalysis net composition: Pt-Rh-Pd 3.5-4-surplus
Retrieving arrangement is combined into one, be placed in platinum catalysis net below, on the holder rack, through 226 days payback period, its recovery result was: realized recovery time 226 days, catalysis net platinum consumption 2730.9 grams, reclaim net gain in weight 1642.9 grams, gain in weight/platinum consumption 60.16%, platinum yield 1834.55 grams, platinum yield/platinum consumption 67.18%.Also reclaimed a spot of rhodium.
Claims (2)
1, a kind of recovery method of platinum catalyst, it is characterized in that, the cerium that in the palladium element, adds 0-0.2%, the silk material that diameter is 0.04-0.5mm is processed in melting, be woven into the 30-100 purpose after the annealing and reclaim net, the material of separation net and supporting network adopts the silk footpath to be woven into 15-24 purpose net for the heat-resistance stainless steel silk of 0.3-0.5mm, spacing between each layer net is 0-5mm, the placement of its net is in proper order: separation net-recovery net-separation net-recovery net-supporting network, and tightly be placed on converter for ammonia oxidation platinum catalysis net below, on the holder rack.
2, recovery method according to claim 1 is characterized in that, two-layer recovery net is 90 ° of intersections and stacks, and three layers of isolation, supporting network are 120 ° of intersections and stack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89102171 CN1013962B (en) | 1989-04-15 | 1989-04-15 | Process for recovery of platinum catalyst |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89102171 CN1013962B (en) | 1989-04-15 | 1989-04-15 | Process for recovery of platinum catalyst |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1036189A CN1036189A (en) | 1989-10-11 |
| CN1013962B true CN1013962B (en) | 1991-09-18 |
Family
ID=4854561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89102171 Expired CN1013962B (en) | 1989-04-15 | 1989-04-15 | Process for recovery of platinum catalyst |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1013962B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100457935C (en) * | 2005-11-09 | 2009-02-04 | 贵研铂业股份有限公司 | Palladium-base alloy for recovering platinum catalyst and recovering net |
| CN101036889B (en) * | 2006-03-14 | 2010-08-04 | 上海耀华铂制品有限公司 | Recycling method of catalyzer having platinum |
| CN106829894B (en) * | 2017-01-19 | 2019-01-08 | 济南双硝技术开发有限公司 | A kind of process of novel washing recycling noble metal |
-
1989
- 1989-04-15 CN CN 89102171 patent/CN1013962B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1036189A (en) | 1989-10-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| OR01 | Other related matters | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |