CN106731644A - A kind of method that modified pyrolusite processes coal-fired flue-gas - Google Patents
A kind of method that modified pyrolusite processes coal-fired flue-gas Download PDFInfo
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- CN106731644A CN106731644A CN201611199147.3A CN201611199147A CN106731644A CN 106731644 A CN106731644 A CN 106731644A CN 201611199147 A CN201611199147 A CN 201611199147A CN 106731644 A CN106731644 A CN 106731644A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/508—Sulfur oxides by treating the gases with solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/64—Heavy metals or compounds thereof, e.g. mercury
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8603—Removing sulfur compounds
- B01D53/8609—Sulfur oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8665—Removing heavy metals or compounds thereof, e.g. mercury
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20761—Copper
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Abstract
The present invention relates to coal-fired flue-gas processing technology field, miberal powder after pyrolusite microwave is prepared into miberal powder, is used Li by a kind of method that especially modified pyrolusite processes coal-fired flue-gas2MnTiO4And MnFe2O4Mixed material modification, so that the manganese dioxide increased activity in pyrolusite, removing to oxysulfide and Elemental Mercury in coal-fired flue-gas is more accurate, improve the removal efficiency to coal-fired flue-gas sulphur oxide and Elemental Mercury so that the removal efficiency to oxysulfide and Elemental Mercury has reached more than 96%, and the raw material for using is easy to get, cost is relatively low, in processing procedure, moreover it is possible to obtain added value manganese sulfate product higher, the profit to coal-fired flue-gas treatment is increased.
Description
Technical field
The side of coal-fired flue-gas is processed the present invention relates to coal-fired flue-gas processing technology field, especially a kind of modified pyrolusite
Method.
Background technology
Coal is the main energy resource structure of China, and its yield occupies 70% or so of China's primary energy yield, as me
Main support during state's energy source use.Contain substantial amounts of discarded object in coal, especially containing substantial amounts of oxysulfide and
Mercury composition, in coal combustion process, oxysulfide with the form of sulfur dioxide, mercury composition in the form of mercury vapour, with cigarette
Gas is discharged in the environment, and sulfur dioxide forms acid rain with contacting rain water again, and mercury vapour follows rain under conditions of cold air is run into
Water returns to earth's surface so that earth's surface is seriously contaminated.
Requirement more and more higher with people to environmental quality, for waste gas discharge during, also occur in that strict mark
Standard, this is caused in coal combustion process, it is necessary to the flue gas of generation of burning is carried out into desulfuration demercuration treatment so that in fume emission
Oxysulfide and Elemental Mercury content it is up to standard, reduce pollution of the fume emission to environment；In the prior art, while desulfuration demercuration
Investigative technique studied, such as number of patent application is carried out at desulfuration demercuration for 201610149557 using low-grade pyrolusite
Reason；Such as Patent No. 200810118580 provides sulfur and mercury removing agent.
At present, because raw material prepared by special sulfur and mercury removing agent is difficult to obtain so as to flue gas desulfurizing and hydrargyrum-removing treatment
It is relatively costly；And the scheme of desulfuration demercuration treatment is carried out to flue gas using pyrolusite, although its cost is relatively low, and can be de-
During sulphur demercuration, additional manganese sulfate product is obtained, improve value-added content of product；But it is removed to flue gas desulfurizing and hydrargyrum-removing
Rate is more undesirable, and 70% or so can be reached for desulfurization removal efficiency, and demercuration removal efficiency is brought up to by traditional 54% or so
64% or so so that in the flue gas of discharge, still contain substantial amounts of sulphur, mercury composition；Therefore, for by the sulphur in flue gas, mercury into
The removal efficiency for dividing further is improved, and is still the direction that those skilled in the art are continually striving to.
The content of the invention
In order to solve above-mentioned technical problem present in prior art, it is coal-fired that the present invention provides a kind of modified pyrolusite treatment
The method of flue gas.
It is achieved particular by following technical scheme：
A kind of method that modified pyrolusite processes coal-fired flue-gas, comprises the following steps：
(1) pyrolusite is prepared into powder using after microwave radiation processing, obtains miberal powder；
(2) by Li2MnTiO4And MnFe2O4After mixing according to any mass ratio being not zero, temperature is placed on for 50-
0.5-1.7h is processed in 70 DEG C, adds the 4-12 times of miberal powder of quality step (1), ultrasonication 10-30min to water so that ore deposit
Powder is moistened, and it is 130-210 DEG C for the treatment of 3-7min to use temperature, obtains mineral powder modified；
(3) mineral powder modified is filled in fixed bed reactors, coal-fired flue-gas is entered into fixed bed reactors with filling
After mineral powder modified layer haptoreaction, coal-fired flue-gas are 20-30min with the mineral powder modified catalytic time, are discharged it, i.e.,
Can.
Described is prepared into powder, is that the pyrolusite of microwave radiation processing is warming up into 300-600 DEG C, waters so that soft
There is hydro-thermalization reaction in manganese ore, efflorescence obtains miberal powder.
Described microwave, microwave power is 80-230W, and microwave irradiation time is 15-33min.
Described ultrasonic wave, frequency is 40-70Hz.
Described coal-fired flue-gas, the flow velocity that it is passed through fixed bed reactors is 10-15L/min.
Described coal-fired flue-gas, its temperature is 80-140 DEG C.
Described mineral powder modified, before being filled into fixed bed reactors, has also been added thereto to account for mineral powder modified matter
Measure the cupric oxide powder of 3-11%.
Described mineral powder modified, its granularity is 20-80 mesh.
Described step, after being additionally included in mineral powder modified and coal-fired flue-gas haptoreaction, is placed on temperature for 40-70 DEG C
Water in immersion, filtering.
Compared with prior art, the technique effect of the invention is embodied in：
After pyrolusite microwave is prepared into miberal powder, miberal powder is used into Li2MnTiO4And MnFe2O4Mixture
Material modification so that the manganese dioxide increased activity in pyrolusite, to the oxysulfide in coal-fired flue-gas and Elemental Mercury
Removing is more accurate, improves the removal efficiency to coal-fired flue-gas sulphur oxide and Elemental Mercury so as to oxysulfide and simple substance
The removal efficiency of mercury has reached more than 96%, and the raw material for using is easy to get, and cost is relatively low, in processing procedure, moreover it is possible to added
Value manganese sulfate product higher, increases the profit to coal-fired flue-gas treatment.
Technical scheme in order to further instruction the invention can be to coal-fired flue-gas sulphur oxide and list
The removal efficiency of matter mercury, the researcher of the invention carries out the processing method of embodiment 1-6 to following simulation coal-fired flue-gas
Desulfuration demercuration treatment, and to oxysulfide, the content detection of Elemental Mercury in the simulated flue gas after before processing, while to treatment mould
After mineral powder modified after plan flue gas uses temperature for 40-70 DEG C of hot-water soak treatment 10-20min, then filtered, and will filter
Liquid carries out condensing crystallizing, reclaims manganese sulfate, detects the purity of manganese sulfate, and its result is as shown in table 1 below：
Simulated flue gas are, with nitrogen as carrier, to adjust temperature between 70-150 DEG C, sulfur dioxide and list to be filled with thereto
Matter mercury, obtains.
Table 1
Be can be seen that by upper table data can be by the oxysulfide and Elemental Mercury in coal-fired flue-gas for modified pyrolusite powder
Removal efficiency bring up to more than 96%, and the purity of the addition product for obtaining is higher, and added value of product is higher, reduces fire coal
The cost of fume treatment, improves economic benefit.
Specific embodiment
Technical scheme is further limited with reference to specific embodiment, but claimed
Scope is not only limited to description.
In certain embodiments, the method that the pyrolusite that is modified processes coal-fired flue-gas, comprises the following steps：
(1) pyrolusite is prepared into powder using after microwave radiation processing, obtains miberal powder；
(2) by Li2MnTiO4And MnFe2O4After mixing according to any mass ratio being not zero, temperature is placed on for 50-
0.5-1.7h is processed in 70 DEG C, adds the 4-12 times of miberal powder of quality step (1), ultrasonication 10-30min to water so that ore deposit
Powder is moistened, and it is 130-210 DEG C for the treatment of 3-7min to use temperature, obtains mineral powder modified；
(3) mineral powder modified is filled in fixed bed reactors, coal-fired flue-gas is entered into fixed bed reactors with filling
After mineral powder modified layer haptoreaction, coal-fired flue-gas are 20-30min with the mineral powder modified catalytic time, are discharged it, i.e.,
Can.
In certain embodiments, it is described to be prepared into powder, it is that the pyrolusite of microwave radiation processing is warming up to 300-600
DEG C, to water so that pyrolusite occurs hydro-thermalization reaction, efflorescence obtains miberal powder.Hydro-thermalization is reacted so that pyrolusite atomization process
It is more uniform, and change the defect of the crystal structure destruction that traditional pyrolusite machinery efflorescence is caused so that pyrolusite efflorescence
Process is gently changed, and improves the activity after pyrolusite efflorescence, is conducive to improving the removal efficiency of coal-fired flue gas desulfurization demercuration.
In certain embodiments, described microwave, microwave power is 80-230W, and microwave irradiation time is 15-
33min。
In certain embodiments, described ultrasonic wave, frequency is 40-70Hz.
In certain embodiments, described coal-fired flue-gas, the flow velocity that it is passed through fixed bed reactors is 10-15L/min.Really
Protect coal-fired flue-gas and certain hour is stopped in fixed bed reactors, the time that raising is contacted with mineral powder modified, be conducive to improving de-
Except rate.
In certain embodiments, described coal-fired flue-gas, its temperature is 80-140 DEG C.Under the temperature conditionss, enable to
The activation energy of the active ingredient in pyrolusite is higher, is conducive to improving removal efficiency.
In certain embodiments, described mineral powder modified, before being filled into fixed bed reactors, is also added thereto to
There is the cupric oxide powder for accounting for mineral powder modified quality 3-11%.Cupric oxide powder can play catalysis and activation modification pyrolusite powder
Purpose, improve removal efficiency.
In certain embodiments, described mineral powder modified, its granularity is 20-80 mesh.
In certain embodiments, described step, after being additionally included in mineral powder modified and coal-fired flue-gas haptoreaction, is put
Immersion, filtering in temperature is for 40-70 DEG C of water.Realize the raising of added value of product.
Embodiment 1
The method that modified pyrolusite processes coal-fired flue-gas, comprises the following steps：
(1) pyrolusite is crushed and is prepared into powder using after microwave radiation processing, obtained miberal powder；
(2) by Li2MnTiO4And MnFe2O4After mixing according to any mass ratio being not zero, temperature is placed on for 50 DEG C
Middle treatment 0.5h, adds 4 times of miberal powders of quality step (1), ultrasonication 10min to water so that miberal powder is moistened, using temperature
It is 130 DEG C for the treatment of 3min to spend, and obtains mineral powder modified；
(3) mineral powder modified is filled in fixed bed reactors, coal-fired flue-gas is entered into fixed bed reactors with filling
After mineral powder modified layer haptoreaction, coal-fired flue-gas are 20min with the mineral powder modified catalytic time, are discharged it, you can.
After mineral powder modified and coal-fired flue-gas haptoreaction, immersion, filtering in the water that temperature is 40 DEG C are placed on.
Embodiment 2
The method that modified pyrolusite processes coal-fired flue-gas, comprises the following steps：
(1) pyrolusite is used into microwave radiation processing, microwave power is 80W, and microwave irradiation time is 15min, is warming up to
300 DEG C, water so that pyrolusite occurs hydro-thermalization reaction, efflorescence obtains miberal powder；
(2) by Li2MnTiO4And MnFe2O4After mixing according to any mass ratio being not zero, temperature is placed on for 70 DEG C
Middle treatment 1.7h, adds 12 times of miberal powders of quality step (1), ultrasonication 30min to water so that miberal powder is moistened, using temperature
It is 210 DEG C for the treatment of 7min to spend, and obtains mineral powder modified；
(3) mineral powder modified is filled in fixed bed reactors, coal-fired flue-gas is entered into fixed bed reactors with filling
After mineral powder modified layer haptoreaction, coal-fired flue-gas are 30min with the mineral powder modified catalytic time, are discharged it, you can.
After mineral powder modified and coal-fired flue-gas haptoreaction, immersion, filtering in the water that temperature is 70 DEG C are placed on.
Embodiment 3
The method that modified pyrolusite processes coal-fired flue-gas, comprises the following steps：
(1) pyrolusite is used into microwave radiation processing, microwave power is 230W, and microwave irradiation time is 33min, is warming up to
600 DEG C, water so that pyrolusite occurs hydro-thermalization reaction, efflorescence obtains miberal powder；
(2) by Li2MnTiO4And MnFe2O4After mixing according to any mass ratio being not zero, temperature is placed on for 60 DEG C
Middle treatment 1.1h, adds 11 times of miberal powders of quality step (1), and ultrasonication 20min, ultrasonic frequency is 50Hz, is watered, and is made
Miberal powder moistening is obtained, it is 180 DEG C for the treatment of 5min to use temperature, obtains mineral powder modified；
(3) mineral powder modified is filled in fixed bed reactors, coal-fired flue-gas is entered into fixed bed reactors with filling
After mineral powder modified layer haptoreaction, the flow velocity that coal-fired flue-gas are passed through fixed bed reactors is 10L/min, coal-fired flue-gas and modified ore deposit
The powder catalytic time is 25min, is discharged it, you can.
After mineral powder modified and coal-fired flue-gas haptoreaction, immersion, filtering in the water that temperature is 50 DEG C are placed on.
Embodiment 4
The method that modified pyrolusite processes coal-fired flue-gas, comprises the following steps：
(1) pyrolusite is used into microwave radiation processing, microwave power is 170W, and microwave irradiation time is 25min, is warming up to
500 DEG C, water so that pyrolusite occurs hydro-thermalization reaction, efflorescence obtains miberal powder；
(2) by Li2MnTiO4And MnFe2O4After mixing according to any mass ratio being not zero, temperature is placed on for 50 DEG C
Middle treatment 1.7h, adds 5 times of miberal powders of quality step (1), and ultrasonication 30min, ultrasonic frequency is 40Hz, is watered, and is made
Miberal powder moistening is obtained, it is 210 DEG C for the treatment of 5min to use temperature, obtains mineral powder modified；
(3) cupric oxide powder for having and accounting for mineral powder modified quality 3% is added to mineral powder modified, fixed bed reactors are filled in
In, after coal-fired flue-gas are entered into mineral powder modified layer haptoreaction of the fixed bed reactors with filling, coal-fired flue-gas are passed through fixed bed
The flow velocity of reactor is 13L/min, and coal-fired flue-gas are 25min with the mineral powder modified catalytic time, are discharged it, you can.
After mineral powder modified and coal-fired flue-gas haptoreaction, immersion, filtering in the water that temperature is 50 DEG C are placed on.
Embodiment 5
The method that modified pyrolusite processes coal-fired flue-gas, comprises the following steps：
(1) pyrolusite is used into microwave radiation processing, microwave power is 120W, and microwave irradiation time is 15min, is warming up to
600 DEG C, water so that pyrolusite occurs hydro-thermalization reaction, efflorescence obtains miberal powder；
(2) by Li2MnTiO4And MnFe2O4After mixing according to any mass ratio being not zero, temperature is placed on for 70 DEG C
Middle treatment 1.7h, adds 7 times of miberal powders of quality step (1), and ultrasonication 17min, ultrasonic frequency is 55Hz, is watered, and is made
Miberal powder moistening is obtained, it is 190 DEG C for the treatment of 6min to use temperature, obtains mineral powder modified, and its granularity is 20 mesh；
(3) cupric oxide powder for having and accounting for mineral powder modified quality 11% is added to mineral powder modified, fixed bed reactors are filled in
In, after coal-fired flue-gas are entered into mineral powder modified layer haptoreaction of the fixed bed reactors with filling, coal-fired flue-gas are passed through fixed bed
The flow velocity of reactor is 14L/min, and coal-fired flue-gas are 23min with the mineral powder modified catalytic time, are discharged it, you can.
After mineral powder modified and coal-fired flue-gas haptoreaction, immersion, filtering in the water that temperature is 50 DEG C are placed on.
Embodiment 6
The method that modified pyrolusite processes coal-fired flue-gas, comprises the following steps：
(1) pyrolusite is used into microwave radiation processing, microwave power is 230W, and microwave irradiation time is 20min, is warming up to
500 DEG C, water so that pyrolusite occurs hydro-thermalization reaction, efflorescence obtains miberal powder；
(2) by Li2MnTiO4And MnFe2O4After mixing according to any mass ratio being not zero, temperature is placed on for 65 DEG C
Middle treatment 0.9h, adds 11 times of miberal powders of quality step (1), and ultrasonication 10min, ultrasonic frequency is 70Hz, is watered, and is made
Miberal powder moistening is obtained, it is 190 DEG C for the treatment of 4min to use temperature, obtains mineral powder modified, and its granularity is 80 mesh；
(3) cupric oxide powder for having and accounting for mineral powder modified quality 8% is added to mineral powder modified, fixed bed reactors are filled in
In, after coal-fired flue-gas are entered into mineral powder modified layer haptoreaction of the fixed bed reactors with filling, coal-fired flue-gas are passed through fixed bed
The flow velocity of reactor is 12L/min, and coal-fired flue-gas are 27min with the mineral powder modified catalytic time, are discharged it, you can.
After mineral powder modified and coal-fired flue-gas haptoreaction, immersion, filtering in the water that temperature is 63 DEG C are placed on.
Claims (9)
1. a kind of method that modified pyrolusite processes coal-fired flue-gas, it is characterised in that comprise the following steps：
(1) pyrolusite is prepared into powder using after microwave radiation processing, obtains miberal powder；
(2) by Li2MnTiO4And MnFe2O4After mixing according to any mass ratio being not zero, temperature is placed on in 50-70 DEG C
Treatment 0.5-1.7h, adds the 4-12 times of miberal powder of quality step (1), ultrasonication 10-30min to water so that miberal powder is wet
Profit, it is 130-210 DEG C for the treatment of 3-7min to use temperature, obtains mineral powder modified；
(3) mineral powder modified is filled in fixed bed reactors, it is modified with filling that coal-fired flue-gas are entered into fixed bed reactors
After miberal powder layer haptoreaction, coal-fired flue-gas are 20-30min with the mineral powder modified catalytic time, are discharged it, you can.
2. the method that modified pyrolusite as claimed in claim 1 processes coal-fired flue-gas, it is characterised in that described is prepared into powder
End, is that the pyrolusite of microwave radiation processing is warming up into 300-600 DEG C, is watered so that pyrolusite occurs hydro-thermalization reaction, powder
Change, obtain miberal powder.
3. the method that modified pyrolusite as claimed in claim 1 processes coal-fired flue-gas, it is characterised in that described microwave spoke
Penetrate, microwave power is 80-230W, microwave irradiation time is 15-33min.
4. the method that modified pyrolusite as claimed in claim 1 processes coal-fired flue-gas, it is characterised in that described ultrasonic wave,
Frequency is 40-70Hz.
5. the method that modified pyrolusite as claimed in claim 1 processes coal-fired flue-gas, it is characterised in that described coal-fired cigarette
Gas, the flow velocity that it is passed through fixed bed reactors is 10-15L/min.
6. the method that the modified pyrolusite as described in claim 1 or 5 processes coal-fired flue-gas, it is characterised in that described fire coal
Flue gas, its temperature is 80-140 DEG C.
7. the method that modified pyrolusite as claimed in claim 1 processes coal-fired flue-gas, it is characterised in that described modified ore deposit
Powder, before being filled into fixed bed reactors, is also added thereto to account for the cupric oxide powder of mineral powder modified quality 3-11%.
8. the method that the modified pyrolusite as described in claim 1 or 7 processes coal-fired flue-gas, it is characterised in that described is modified
Miberal powder, its granularity is 20-80 mesh.
9. the method that modified pyrolusite as claimed in claim 1 processes coal-fired flue-gas, it is characterised in that described step, also
After being included in mineral powder modified and coal-fired flue-gas haptoreaction, immersion, filtering in the water that temperature is 40-70 DEG C are placed on.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114481166A (en) * | 2022-03-07 | 2022-05-13 | 广西汇元锰业有限责任公司 | Preparation method of high-quality electrolytic manganese dioxide |
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| CN102107113A (en) * | 2005-03-29 | 2011-06-29 | 洋马株式会社 | Exhaust gas purifying apparatus |
| CN104028218A (en) * | 2014-06-06 | 2014-09-10 | 四川大学 | Low-cost high-activity catalytic type desulphurization active coke and preparation method thereof |
| CN105289645A (en) * | 2015-11-14 | 2016-02-03 | 华玉叶 | Catalyst composition used for fire coal flue gas purifying |
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2016
- 2016-12-22 CN CN201611199147.3A patent/CN106731644A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102107113A (en) * | 2005-03-29 | 2011-06-29 | 洋马株式会社 | Exhaust gas purifying apparatus |
| CN104028218A (en) * | 2014-06-06 | 2014-09-10 | 四川大学 | Low-cost high-activity catalytic type desulphurization active coke and preparation method thereof |
| CN105289645A (en) * | 2015-11-14 | 2016-02-03 | 华玉叶 | Catalyst composition used for fire coal flue gas purifying |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114481166A (en) * | 2022-03-07 | 2022-05-13 | 广西汇元锰业有限责任公司 | Preparation method of high-quality electrolytic manganese dioxide |
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Application publication date: 20170531 |