CN106967886A - A kind of method that on-line cleaning reclaims noble metal in nitric acid plant - Google Patents
A kind of method that on-line cleaning reclaims noble metal in nitric acid plant Download PDFInfo
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- CN106967886A CN106967886A CN201710150886.1A CN201710150886A CN106967886A CN 106967886 A CN106967886 A CN 106967886A CN 201710150886 A CN201710150886 A CN 201710150886A CN 106967886 A CN106967886 A CN 106967886A
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- oxidation furnace
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- nitric acid
- noble metal
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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
- C22B11/00—Obtaining noble metals
- C22B11/04—Obtaining noble metals by wet processes
- C22B11/042—Recovery of noble metals from waste materials
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B21/00—Nitrogen; Compounds thereof
- C01B21/20—Nitrogen oxides; Oxyacids of nitrogen; Salts thereof
- C01B21/38—Nitric acid
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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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- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Inorganic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention provides on-line cleaning in a kind of nitric acid plant and reclaims the method for noble metal, wherein the equipment for needing cleaning is the oxidation furnace of " bar cloth cock " boiler form, this equipment is combined vertical structure, inlet and outlet pipe lines connection；Clean range is：From catalyst frame lower part equipment shell body cleaning to oxidation furnace lower gas exit, between include evaporator, water-cooling wall, whole heat exchanger tubes of superheater；Cleaning process is as follows：Water flushing → pickling → neutralization → secondary washing → passivation → hand inspection reset → pretreatment.The beneficial effects of the invention are as follows：By the on-line cleaning to oxidation furnace, boiler tubulation surface is reached the cleannes meeted the requirements, increase effectively the heat exchange efficiency of waste heat boiler, while also achieving to by the noble metal in impurity（Platinum, palladium）Extraction, significantly reduce the platinum consumption in nitric acid production, be that enterprise's production reduces production cost, improve economic well-being of workers and staff.
Description
Technical field
The present invention relates to a kind of method for recovering precious metals, and in particular to on-line cleaning reclaims noble metal in a kind of nitric acid plant
Method.
Background technology
The production technology of nitric acid is broadly divided into high-pressure process, non-pressure process in the world（Seldom）And double pressurized method.High-pressure process due to
High energy consumption and low yield energy, and due to the requirement of environmental protection, it is domestic at present closely to eliminate.And the double pressurized method technique being a dark horse, with
Its low energy consumption and high production capacity, it has also become the main force of nitric acid production, domestic pressurization process units double at present have to be covered more 100, is often covered
Production capacity is more than 100,000 tons/year.Counted according to national nitric acid salt made from earth containing a comparatively high percentage of sodium chloride association, domestic pressurized nitric acid process units double at present make extensively
Net is covered with feature and platinum recover is installed additional, and in 2016 years, the yield of national nitric acid is 15,000,000 tons, is consumed with 0.15 g ton
Platinum, 0.1 g ton palladium consumption are calculated.The whole nation will be lost platinum porpezite for 1 year and distinguish 2.25 tons, 1.5 tons.Total value is in more than ten00000000 yuan of people
People's coin（Now belong to history noble metal price most bottom position period）.Again because noble metal belongs to national strategy goods and materials, social value
It is huge.
Nitric acid production is, using ammonia, oxygen as raw material, both fully burning chemical combination to be realized by the catalysis of platinum net.In nitric acid production
In, the operating temperature of platinum-nickel alloys catalysis net is 850-880 DEG C, while under the constant impingement of high pressure draught, your gold such as platinum, palladium
The loss of category also can gradually increase with the working time.The method of reduction platinum consumption is mainly at present：Install additional palldium alloy collecter ring,
Using platinum-nickel alloys functional sleeve net, noble metal recover is installed.Install collecter ring additional or had using function network to platinum consumption reduction bright
Effective fruit, but still have a considerable amount of platinum fine particles as high-temperature gas is lost in along process pipe, and due to just
Often in production, the temperature control in oxidation furnace is at 850-880 DEG C, substantial amounts of high-temperature gas and evaporator section and overheat in waste heat boiler
The tubulation of section is directly contacted, and substantial amounts of noble metal granule can be made to stick in the form of the oxide on the inner tubal wall of nitric acid system.
Key equipment oxidation furnace during dilute nitric acid production, its internal exchanger has two kinds of forms, and one kind is domestic big
" bar cloth cock " form that part company uses；Another is external advanced " La Mangte " boiler form.The current country has two
Company has bought in the oxidation furnace of two sets of second-hand " La Mangte " boiler forms, most of dilute nitric acid production device from foreign countries and aoxidized
" bar cloth cock " boiler form is used in stove, and the oxidation furnace of " bar cloth cock " form has two big drawbacks：First, such a boiler
The evaporator section and superheat section of form are frequently present of booster problem, the 3rd set of 270,000 tons/year of production dresses of Shanxi Tian Ji coal chemical industries group
Put superheat section and multiple pipe explosion accident occurred in once 1 year, cause device can not normal continuous and steady operation；Jinan chemical fertilizer factory 10
Ten thousand tons/year of production device evaporator sections have blocked up more than ten pipe because of booster.Similar device and similar pipe explosion accident are in China
Double upper pressurizations production nitric acid producers it is of common occurrence；2nd, waste heat boiler outlet at bottom NOx gas temperatures are up to 430-470
DEG C, all not up to design objectives（400 DEG C or so）Requirement, this temperature high explanation waste heat boiler heat transfer effect it is bad, change
The bad impurity for also implying that tubulation adsorption of thermal effect is too many, and the heat exchange efficiency of boiler can be made to have a greatly reduced quality.
Because current most of nitric acid producer of China is all inside the oxidation furnace of " bar cloth cock " boiler form, the oxidation furnace
Boiler heat exchange pipe used due to long-time, directly contacted with ammonia and air, cause tubulation surface corrosion to deposit fouling serious,
It is greatly reduced the heat exchange efficiency of waste heat boiler, so not only the yield of byproduct steam declines, also can be to the technique of whole system
Control influence is very big.
The content of the invention
For above-mentioned situation, the technical problems to be solved by the invention are：Oxidation furnace used is general in existing nitric acid production
Store-through causes waste heat boiler heat exchange efficiency to decline the problem of tubulation surface corrosion deposition fouling is serious, byproduct steam yield
Decline.
For above-mentioned technical problem, the technical solution used in the present invention is：On-line cleaning in a kind of nitric acid plant is provided
The method for reclaiming noble metal；The equipment for wherein needing cleaning is the oxidation furnace of " bar cloth cock " boiler form, and this equipment is combination
Vertical structure, inlet and outlet pipe lines connection；Clean range is：Go out from catalyst frame lower part equipment shell body cleaning to oxidation furnace lower gas
Mouthful place, between including evaporator, water-cooling wall, whole heat exchanger tubes of superheater.
The specific method of on-line cleaning recovery noble metal is as follows in nitric acid plant：
It is as follows according to the successful experience cleaning process of similar engineering：Water flushing → pickling → neutralization → secondary washing → passivation
→ hand inspection reset → pretreatment；Specific operation process is as follows.
（1）Water is rinsed（System leak test）
During using producer's parking maintenance, the big lid of oxidation furnace is taken apart, internal catalyst frame and platinum guaze is integrally hung out, and opens height
The oxidation furnace that warm gas-gas heat exchanger is close to enters hole, and adjacent oxidation furnace exit installs blind plate additional inside process gas pipeline, blind
Plate bottom is reinforced with channel-section steel, then connects excessive with outside inside oxidation furnace by the aperture in the middle of blind plate with wired hose
Flow tank；Then, toward clear water is constantly infused in oxidation furnace, the sewage after equipment flows into overflow tank from the pipeline in the middle of blind plate
Lower floor；With being on the increase for outflow sewage, the water meeting overflow in lower layers of containers starts clear into overflow tank upper strata container, then
Pump is washed, the water in the container of upper strata is re-injected in oxidation furnace, a closed circulatory system is formed, after cleaning 5-8 hours,
Check whether there is leak source.
（2）Pickling
Allocate acid solution, with the continuous injection of acid solution, in oxidation furnace the solution of overflow tank lower floor will overflow it is supreme
In layer, then the solution in upper strata is re-injected in oxidation furnace by pump, so constantly circulated；
The acid solution selection volumetric concentration is any one in 10% hydrochloric acid or phosphoric acid solution.
（3）Neutralize
After pickling terminates, quantitative nertralizer is slowly added into oxidation furnace（Normal temperature）.Start cleaning pump and carry out circulation 0.5-1
After hour, after water sample pH value is 8 or so, clear water is replaced, it is normal to water sample.
Dosing：The concentration that adds of nertralizer is 100-150Kg/T；
Process conditions：Normal temperature, 0.5-1 hours；
The nertralizer selection sodium hydroxide or sodium bicarbonate solution.
（4）Secondary washing
After neutralization terminates, rinsed inside oxidation furnace, sewage draining valve should be opened greatly in flushing process repeatedly with substantial amounts of clear water；When
Import and export and the water quality of each sewage draining exit is clarified, you can terminate cleaning.
（5）Passivation
Quantitative passivator is slowly added into overflow tank（Water temperature is kept for 95 ± 5 DEG C）, start cleaning pump, will be blunt by cleaning pump
In agent injection oxidation furnace, by oxidation furnace exit blind plate bottom, wired hose is turned again in overflow tank, is circulated 8-12 hours
Afterwards, clear water is replaced, it is normal to water sample.
The passivator selects the phosphate of 0.1-0.5% concentration；Concentration is added for 150Kg/T；Reaction temperature：95±5
℃；Reaction time：8-12 hours（Note：Time, longer passivation effect was better）.
（6）Manual cleaning resets
After cleaning completion, detailed inspection is carried out to oxidation furnace inside, the dirty thing residue at local dead angle position is thoroughly removed, it is qualified after
Reset.
（7）Quality standard ensures
Equipment passivation should be reached the set quota or is combined《Boiler Chemical directive/guide》In standard；
Metal surface after a, cleaning should be cleaned, the dirty thing of basic noresidue；The mistake separated out without obvious metal coarse-grain washes phenomenon；
B, the metal average corrosion rate measured with corrosion indicator piece should be less than 6g/m2H, corrosion total amount is less than 60g/m2。
The overflow tank is connected between two layers, two layers above and below being divided into tubule, above one layer be used for recirculation solution,
One layer is the impurity such as precipitate precious metals below.
Wrapped up around the blind plate with stainless steel coil, to prevent the stainless steel tube line loss to oxidation furnace exit gas
Evil.
During being cleaned to oxidation furnace, 1, my company can use the steel of stainless steel around blind plate when installing blind plate additional
Circle is wrapped up, and any infringement will not be caused to stainless steel tubing.Toward before injection solution in oxidation furnace when the 2nd, cleaning, can first it note
Enter clear water and carry out circulation leak test, it is ensured that without cleaning fluid is allocated after leak source again, can thus eliminate oxidation furnace includes boiler tubulation
Any leak source.3rd, cleaning fluid is a kind of special solution, is the patented product of my company, by test of many times, the solution will not
There is any corrosiveness to any iron and steel material quality.In summary, will not be to equipment and pipe during being cleaned to oxidation furnace
Line causes any harmful effect.On the contrary, can also increase the heat exchange efficiency of boiler in oxidation furnace after cleaning, nitric acid dress is substantially increased
Put the yield of byproduct steam in normal productive process.
Passivation refers to after the oxidized property media processes of metal that what is be decreased significantly before its etch ratio is originally untreated shows
As.Passivation is last processing step in Chemical cleaning, is a crucial step；Boiler heat exchange tubulation is rinsed through pickling, water, rinsing
Afterwards, metal surface is cleaned very much, is activated very much, it is easy to corroded, so processing must be passivated immediately, is made after cleaning
Metal surface generates diaphragm, slows down corrosion.PASSIVATION MECHANISM：It can be explained with boundary-layer theory, that is, it is due to metal to think passivation
Acted on Oxidant, generated during effect in metal surface it is a kind of it is very thin, fine and close, that covering performance is good, in energy
Admittedly attached passivating film on the metal surface.This tunic mutually exists into independent, typically the compound of oxygen and metal.It plays handle
Metal and the completely separated effect of corrosive medium, prevent metal from directly being contacted with corrosive medium so that metal stop substantially it is molten
Solution.Its surface can form the passivating film for meeting above-mentioned requirements, but the passivating film after the oxidized property media processes of austenitic stainless steel
In the case where playing the halide ions such as Cl-, Br-, F- of activation, destruction is highly prone to.Though this namely through acid wash passivation at
If the austenitic stainless steel pressure vessels of reason can not remove clean after the water pressure test is carried out by water stain, but the Cl- of water should be controlled to contain
One of the reason for amount is no more than 25ppm.The oxide-film of other not any metal all may be regarded as passivating film, and such as carbon steel is in high temperature oxygen
The oxide-film formed after change is rigidly attached to the requirement of metal surface due to that can not meet and can not use passivating film as.
The beneficial effects of the invention are as follows：By the on-line cleaning to oxidation furnace, not only make boiler tubulation surface reach in accordance with
It is required that cleannes, the heat exchange efficiency of waste heat boiler is increase effectively, while also achieving to by the noble metal in impurity（Platinum,
Palladium）Extraction, significantly reduce the platinum consumption in nitric acid production, be that enterprise's production reduces production cost, improve economic well-being of workers and staff.
Brief description of the drawings
Fig. 1 is facilities and equipments transformation schematic diagram of the present invention；
In figure：1st, the big lid of oxidation furnace；2nd, catalyst frame and platinum guaze；3rd, oxidation furnace；4th, blind plate；5th, channel-section steel；6th, wired hose；7th, high temperature
Gas-gas heat exchanger；8th, hole is entered；9th, overflow tank；10th, cleaning pump.
Embodiment
The present invention will be described by the following examples, and a kind of nitric acid plant on-line cleaning is provided in the present invention and is reclaimed
The method of noble metal, cleaning process is as follows：Water flushing → pickling → neutralization → secondary washing → passivation → hand inspection is multiple
Position → pretreatment.
（1）Water is rinsed：During using producer's parking maintenance, the big lid 1 of oxidation furnace is taken apart, internal catalyst frame and platinum guaze 2
Entirety is hung out, and open that high temperature gas-gas heat exchanger 7 suffers oxidation furnace 3 enter hole 8, the adjacent oxidation furnace 3 inside process gas pipeline
Exit installs blind plate 4 additional, and the bottom of blind plate 4 is reinforced with channel-section steel 5, is then connected with wired hose 6 by the aperture in the middle of blind plate 4
The overflow tank 9 of the logical inside of oxidation furnace 3 and outside, as shown in Figure 1；Then toward clear water is constantly infused in oxidation furnace 3, by equipment
Sewage afterwards flows into the lower floor of overflow tank 9 from the pipeline in the middle of blind plate 4；With being on the increase for outflow sewage, in lower layers of containers
Then water meeting overflow starts cleaning pump 10, the water in the container of upper strata is re-injected into oxidation furnace 3 into the upper strata container of overflow tank 9
It is interior, a closed circulatory system is formed, after cleaning 5-8 hours, leak source is checked whether there is.
（2）Pickling：The hydrochloric acid solution of allotment 10%, with the continuous injection of hydrochloric acid solution, the lower floor of overflow tank 9 in oxidation furnace 3
Solution will overflow into upper strata, then the solution in upper strata is re-injected in oxidation furnace 3 by pump, so constantly entered
Row circulation.
（3）Neutralize：After pickling terminates, quantitative sodium bicarbonate solution is slowly added into oxidation furnace 3；Adding concentration is
130Kg/T；Start cleaning pump 10 and carry out circulation 0.5 hour, after water sample pH value is 8 or so, replace clear water, it is normal to water sample.
（4）Secondary washing：After neutralization terminates, rinsed repeatedly inside oxidation furnace 3 with substantial amounts of clear water, should in flushing process
Sewage draining valve is opened greatly；When the water quality clarification of import and export and each sewage draining exit, you can terminate cleaning.
（5）Passivation：Quantitative concentration is slowly added into overflow tank 9 for 0.3% phosphate（Water temperature is kept for 95 ± 5 DEG C）, open
Dynamic cleaning pump 10, is injected passivator in oxidation furnace 3 by cleaning pump 10, by the bottom wired hose 6 of 3 exit blind plate of oxidation furnace 4
Turn again in overflow tank 9, after circulating 10 hours, replace clear water, it is normal to water sample.
（6）Manual cleaning resets：After cleaning completion, detailed inspection is carried out to the inside of oxidation furnace 3, local dead angle is thoroughly removed
The dirty thing residue at position, qualified rear reset.
（7）Quality standard ensures：Equipment passivation should be reached the set quota or is combined《Boiler Chemical directive/guide》In
Standard；
Metal surface after a, cleaning should be cleaned, the dirty thing of basic noresidue；The mistake separated out without obvious metal coarse-grain washes phenomenon；
B, the metal average corrosion rate measured with corrosion indicator piece should be less than 6g/m2H, corrosion total amount is less than 60g/m2。
Cleaning and recovery method provided in the present invention, will not be to equipment and pipeline during being cleaned to oxidation furnace
Cause any harmful effect.On the contrary, can also increase the heat exchange efficiency of boiler in oxidation furnace after cleaning, nitric acid plant is substantially increased
The yield of byproduct steam in normal productive process.
Claims (3)
1. a kind of method that on-line cleaning reclaims noble metal in nitric acid plant, it is characterised in that using oxidation furnace as reaction vessel,
Line cleans nitric acid plant, and reclaims noble metal；Cleaning process includes：Water flushing → pickling → neutralization → secondary washing → blunt
Change → hand inspection reset → pretreatment；Specific operation process is as follows：
（1）Water is rinsed（System leak test）
The big lid of oxidation furnace is taken apart, internal catalyst frame and platinum guaze is integrally hung out, and open high temperature gas-gas heat exchanger and suffer oxidation furnace
Manhole, adjacent oxidation furnace exit installs blind plate additional inside process gas pipeline, and blind plate bottom is reinforced with channel-section steel, then
The overflow tank inside oxidation furnace with outside is connected by the aperture in the middle of blind plate with wired hose；Then toward in oxidation furnace constantly
Injected clear water, the sewage after equipment flows into overflow tank lower floor from the pipeline in the middle of blind plate；With the continuous increasing of outflow sewage
Many, then the water meeting overflow in lower layers of containers starts cleaning pump, by the water in the container of upper strata again into overflow tank upper strata container
Inject in oxidation furnace, form a closed circulatory system, after cleaning 5-8 hours, check whether there is leak source；
（2）Pickling：Acid solution is injected in oxidation furnace, with the continuous injection of acid solution, overflow tank lower floor in oxidation furnace
Solution will overflow into upper strata, then the solution in upper strata is re-injected in oxidation furnace by pump, moved in circles；
（3）Neutralize：After pickling terminates, quantitative nertralizer is slowly added into oxidation furnace（Normal temperature）, start cleaning pump and carry out
After circulation 0.5-1 hours, after water sample pH value is 8 or so, clear water is replaced, it is normal to water sample；
（4）Secondary washing：After neutralization terminates, rinsed inside oxidation furnace, will should be arranged in flushing process repeatedly with substantial amounts of clear water
Dirty valve is opened greatly；When the water quality clarification of import and export and each sewage draining exit, you can terminate cleaning；
（5）Passivation：Quantitative passivator is slowly added into overflow tank（Water temperature is kept for 95 ± 5 DEG C）, start cleaning pump, by clear
Wash pump to inject passivator in oxidation furnace, by oxidation furnace exit blind plate bottom, wired hose is turned again in overflow tank, circulation
After 8-12 hours, clear water is replaced, it is normal to water sample；
（6）Manual cleaning resets：After cleaning completion, detailed inspection is carried out to oxidation furnace inside, local dead angle position is thoroughly removed
Dirty thing residue, it is qualified after reset；
Acid solution selection concentration applied in the pickling is any one in 10% hydrochloric acid or phosphoric acid solution；
Used in the neutralization nertralizer selection sodium hydroxide or sodium bicarbonate solution in any one, adding concentration is
100-150Kg/T；Neutral temperature is normal temperature, and the time that neutralizes is 0.5-1 hours；
The passivator selects the phosphate of 0.1-0.5% concentration；Concentration is added for 150Kg/T；Reaction temperature：95±5℃；Instead
Between seasonable：8-12 hours.
2. the method that on-line cleaning reclaims noble metal in a kind of nitric acid plant according to claim 1, its feature exists
In when adjacent oxidation furnace exit installs blind plate additional inside process gas pipeline, being wrapped around the blind plate with stainless steel coil
Wrap up in.
3. the method that on-line cleaning reclaims noble metal in a kind of nitric acid plant according to claim 1, its feature exists
Connected above and below, the overflow tank is divided between two layers, two layers with tubule, above one layer be used for recirculation solution, below
One layer is the impurity such as precipitate precious metals.
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| CN201710150886.1A CN106967886B (en) | 2017-03-14 | 2017-03-14 | A kind of method of on-line cleaning recycling noble metal in nitric acid plant |
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| CN201710150886.1A CN106967886B (en) | 2017-03-14 | 2017-03-14 | A kind of method of on-line cleaning recycling noble metal in nitric acid plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112708893A (en) * | 2019-10-24 | 2021-04-27 | 中国石油天然气股份有限公司 | Cleaning agent, preparation method thereof, cleaning device and cleaning method of plate heat exchanger |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005272887A (en) * | 2004-03-23 | 2005-10-06 | Dowa Mining Co Ltd | Method for recovering platinum group element |
| CN104482526A (en) * | 2014-11-28 | 2015-04-01 | 徐春 | Processing unit for boiler cleaning connector of supercritical unit and cleaning process thereof |
| JP2017014572A (en) * | 2015-06-30 | 2017-01-19 | 住友金属鉱山株式会社 | Method for producing platinum group salt dissolved solution |
-
2017
- 2017-03-14 CN CN201710150886.1A patent/CN106967886B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005272887A (en) * | 2004-03-23 | 2005-10-06 | Dowa Mining Co Ltd | Method for recovering platinum group element |
| CN104482526A (en) * | 2014-11-28 | 2015-04-01 | 徐春 | Processing unit for boiler cleaning connector of supercritical unit and cleaning process thereof |
| JP2017014572A (en) * | 2015-06-30 | 2017-01-19 | 住友金属鉱山株式会社 | Method for producing platinum group salt dissolved solution |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112708893A (en) * | 2019-10-24 | 2021-04-27 | 中国石油天然气股份有限公司 | Cleaning agent, preparation method thereof, cleaning device and cleaning method of plate heat exchanger |
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Address after: Wang Fengxiang 030024 Shanxi city of Taiyuan province Berlin District Wolong Village million small office floor Applicant after: Taiyuan Rui Lin Precious Metals Recycling Co., Ltd. Address before: 030024 room 1704, King Yi Garden, Yingze West Street, Wan Berlin District, Taiyuan, Shanxi Applicant before: Taiyuan Rui Lin Metal Recycling Co., Ltd. |
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