CN106745128A - A kind of method of aluminium lime-ash removal of impurities - Google Patents
A kind of method of aluminium lime-ash removal of impurities Download PDFInfo
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- CN106745128A CN106745128A CN201710018312.9A CN201710018312A CN106745128A CN 106745128 A CN106745128 A CN 106745128A CN 201710018312 A CN201710018312 A CN 201710018312A CN 106745128 A CN106745128 A CN 106745128A
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- aluminium lime
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/20—Preparation of aluminium oxide or hydroxide from aluminous ores using acids or salts
- C01F7/22—Preparation of aluminium oxide or hydroxide from aluminous ores using acids or salts with halides or halogen acids
Abstract
The invention discloses a kind of method of aluminium lime-ash removal of impurities, belong to compound removal of impurities and industrial waste utilization technology field.The method after aluminium lime-ash grinding screening, washing will be calcined and obtain being calcined powder, then be calcined powder with NaOH solution alkali soluble, obtain alkali aluminate solution；Watery hydrochloric acid is added in alkali aluminate solution until precipitation capacity no longer changes in solution, then carries out separation of solid and liquid acquisition AlCl3Filtrate.In AlCl3Ammoniacal liquor is passed through in filtrate, aluminum hydroxide precipitation is filtrated to get, the purpose of aluminium lime-ash removal of impurities is finally realized.The present invention is using techniques such as washing, roasting, alkali soluble, acid treatments, impurity can effectively be removed, obtain purer aluminum hydroxide precipitation, aluminum oxide is prepared for follow-up and other aluminum-containing products provide high pure raw material, aluminium lime-ash is set to have obtained more fully utilizing, with raw material sources it is wide, environmental pollution is small, material consumption energy consumption is low, low cost and other advantages, is suitable for industrialized production.
Description
Technical field
The invention belongs to compound removal of impurities and industrial waste utilization technology field, more particularly to a kind of aluminium lime-ash is removed
Miscellaneous method.
Background technology
China is the country of metallic aluminium yield maximum in the world, and primary aluminum yield just reaches 31,410,000 tons within only 2015.Typically
Often producing one ton of aluminium will produce 30~50Kg aluminium lime-ash, and its main component is metal (Al, Fe, Ca, Mg etc.), aluminum oxide, dioxy
The most aluminium of SiClx, nitride, carbide etc., wherein content and aluminum oxide are up to 10~80%.With China's metallic aluminium and aluminium
The production scale of alloy constantly expands, and the trend of sharp increase also occurs in the yield of aluminium lime-ash.Contain nitride, carbon in aluminium ash
Compound and fluoride etc., belong to poisonous and harmful substance, are classified as by national environmental protection portion《National Hazard waste register》, current is direct
Landfill method causes significant damage to environment.Therefore, the economical and effective method of aluminium lime-ash removal of impurities is found, having for aluminium secondary resource is realized
Effect recycles and the sustainable development and environmental protection of aluminum i ndustry is had great significance.
Aluminium lime-ash is secondary to prepare aluminum oxide using mainly extraction, and the impurity removal process of early stage directly affects obtained aluminum oxide
Purity.Therefore, dedoping step is the critical process that high-purity alpha-alumina is prepared using aluminium lime-ash.At present, domestic and international aluminium lime-ash
Removal of impurities, recovery processing technique are concentrated mainly on following several respects：Washing, acid wash removal of impurities, floatation removal of impurities, acidleach, roasting method
Removal of impurities, reclaims metallic aluminium and aluminum oxide, produces aluminum sulfate, prepares New Types of Environmental Materials, refractory material etc..
Chinese invention patent (CN103555955A) discloses a kind of resource utilization method of aluminium ash, in the invention with
Aluminium ash is raw material, and metallic aluminium is reclaimed by techniques such as grinding screenings, and washing, alkaline pressure of oxygen leaching, normal pressure acidleach etc. is then respectively adopted
Technology, obtains the aluminium ash of oxygen enrichment aluminium.Aluminium ash can cause aluminium a large amount of by steps such as washing, alkali leaching, acidleach in the technique
Loss, causing the rate of recovery of aluminium reduces；And contain aluminium in water lotion, alkali-washing waste liquid, the pickle liquor for being formed, directly discharge,
Environment can be polluted.Chinese invention patent (CN1673084A) discloses a kind of method of use aluminium scrap ash production aluminum oxide,
The invention carries out iron removal by magnetic separation and dewater treatment after aluminium lime-ash is screened, Na is added in aluminium ash after dewatering2CO3Solution, obtains
Aluminium mortar, cools down after then being sintered at 1100~1200 DEG C and goes out to obtain the thick solution of sodium aluminate with water-soluble, then by heating, pressure
Filter obtains refined aluminium acid sodium solution, is finally passed through CO2Crystallization obtains aluminium hydroxide and calcining obtains aluminum oxide.By aluminium ash in the technique
Slag and Na2CO3Solution mixing high-temperature roasting, the anticorrosive property requirement to equipment is very high, and technique is also excessively cumbersome.Chinese invention is special
Sharp (CN103058239A) discloses a kind of method that aluminum oxide and white carbon are extracted from flyash, in the invention using hydrogen
Sodium oxide molybdena extraction amorphous silicon di-oxide, carbonating separate silicic acid, sodium metasilicate reclaim, residue sintering, HCl extract aluminum oxide and
The steps such as silicic acid are separated, realizing high efficiency extraction aluminum oxide and silica from flyash is used to produce white carbon and oxidation
Aluminium.Equally, the technique is very high to the requirement of the anticorrosive property of equipment, and its technology key be realize aluminum oxide and silica point
From recovery.
To sum up, with Chinese society expanding economy, aluminium production scale constantly expands, and the aluminium lime-ash of generation is more and more,
Because aluminium content is considerable and aluminium lime-ash belongs to poisonous and harmful substance in aluminium lime-ash, directly discard, it will welding, and remove general labourer
Skill can make the aluminium lime-ash turn waste into wealth, therefore the technique of research aluminium lime-ash removal of impurities has a great economic significance and social effect.
The content of the invention
There are problems that polluting big, material consumption high energy consumption, impurity content when the present invention is for aluminium lime-ash removal of impurities, it is proposed that one
The method for planting aluminium lime-ash removal of impurities.
The present invention is achieved by the following technical solutions：
Obtain being calcined powder by after aluminium lime-ash grinding screening, washing be calcined, be then calcined powder with NaOH solution alkali soluble
Material, obtains alkali aluminate solution；Then watery hydrochloric acid is added in alkali aluminate solution until precipitation capacity no longer changes in solution, then carries out
Separation of solid and liquid obtains AlCl3Filtrate；Finally in AlCl3Ammoniacal liquor is passed through in filtrate, aluminum hydroxide precipitation is filtrated to get, it is final to realize
The purpose of aluminium lime-ash removal of impurities.
Further, methods described specifically includes following steps：
(1) after by aluminium lime-ash grinding screening, washing, calcination process is carried out, obtains the roasting powder of certain particle size size；This
Step (1) activates aluminium lime-ash and removes the impurity such as Na, K, Cl, F, Si in aluminium lime-ash using mechanical-chemical composite algorithm；
(2) alkali soluble：Roasting powder is added into NaOH solution, after stirring a period of time under heating condition, separation of solid and liquid is carried out,
The filter residue A containing precipitations such as Fe, Mg, Ca, Cu is removed, alkali aluminate solution is obtained；
(3) excessive watery hydrochloric acid is added in alkali aluminate solution, is precipitated in observation solution, until precipitation capacity does not change, so
Separation of solid and liquid is carried out afterwards and removes the filter residue B containing silicic acid precipitation, obtain AlCl3Filtrate；
(4) in AlCl3In filtrate, ammoniacal liquor regulation pH value is added, filtered after standing reaction a period of time, remove filtrate, obtained
To aluminum hydroxide precipitation.
Further, in the step (1), grinding screen size size is 20~100 mesh；Washing time can for 1~
8h, preferably 3~7h；Washing temperature can be 25~120 DEG C, preferably 80~110 DEG C；Sintering temperature is 500~1000 DEG C,
Preferably 650~900 DEG C；Roasting time is 1~6h, preferably 1~4h.
Further, in the step (2), NaOH solution concentration used is 20~40wt% (mass fraction)；Liquid is consolidated
Mass ratio (NaOH solution:Roasting powder) it is 3:1~12:1, preferably 4:1~10:1；Alkali soluble temperature (i.e. heating-up temperature) is
100~300 DEG C, preferably 150~300 DEG C；The alkali soluble time (i.e. mixing time) is 2~4h.
Further, in the step (3), NaAlO of the watery hydrochloric acid first and in alkali aluminate solution2、Na2SiO3Reaction generation hydrogen
Precipitation of alumina and silicic acid are precipitated, and then excessive watery hydrochloric acid again all dissolves aluminum hydroxide precipitation, and filter residue B is heavy for silicic acid
Form sediment, the concentration of watery hydrochloric acid is preferably 15~30wt%.
Further, in the step (4), add ammoniacal liquor regulation solution pH value be 8~9, time of repose be 0.5~
2h, the concentration of ammoniacal liquor is preferably 20~30wt%.
Compared with prior art, the invention has the advantages that：
(1) it is high to aluminium lime-ash dust removal rate：By carrying out high-temperature roasting pretreatment, the techniques such as NaOH solution alkali soluble are added
The impurity such as significantly more efficient villiaumite, metal oxide, the silica removed in aluminium lime-ash of energy, are conducive to recovery to obtain high purity oxygen
Change aluminium.(2) it is workable：Cost of material is low and is easy to get, step simplicity, environment friendly and pollution-free, the anticorrosive property requirement to equipment
It is low, it is suitable for industrialized production.
Brief description of the drawings
Fig. 1 is process flow diagram of the invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is explained in further detail.It should be appreciated that embodiment described herein is used only for explaining of the invention, and without
It is of the invention in limiting.
Aluminium lime-ash removal of impurities flow in the present invention after aluminium lime-ash grinding screening, washing as shown in figure 1, will be calcined being roasted
Powder is burnt, then powder is calcined with NaOH solution alkali soluble, alkali aluminate solution and filter residue A is obtained；Then added in alkali aluminate solution dilute
Hydrochloric acid is until precipitation capacity no longer changes in solution, then carries out separation of solid and liquid acquisition filter residue B and AlCl3(filtrate is main for filtrate
Contain AlCl3).Finally in AlCl3Ammoniacal liquor is passed through in filtrate, aluminum hydroxide precipitation is filtrated to get, aluminium lime-ash removal of impurities is finally realized
Purpose.Detailed process referring to embodiment, wherein, aluminium lime-ash be electrolytic aluminium or casting aluminium production technology in produce slag through cooling
Product afterwards.
Embodiment 1
Step (1)：After by aluminium lime-ash grinding screening, washing (deionized water), calcination process is carried out, obtain certain particle size big
Small roasting powder；Wherein, screening condition is 20 mesh；Washing conditions are：80 DEG C of washing temperature, washing time 7h；Roasting condition
For：Roasting time 4h, 650 DEG C of sintering temperature.
Step (2)：Roasting powder is added into NaOH solution, after heating and stirring a period of time, solid-liquid is carried out by filtering
Separate, obtain alkali aluminate solution；Wherein, NaOH solution concentration 40wt%, the solid mass ratio 4 of liquid:1, alkali soluble time 4h, alkali soluble temperature
150℃。
Step (3)：Excessive watery hydrochloric acid is added in alkali aluminate solution, is precipitated in observation solution, until precipitation capacity does not become
Change, separation of solid and liquid is then carried out by filtering, obtain AlCl3Filtrate；Wherein, watery hydrochloric acid concentration 30wt%.
Step (4)：In AlCl3In filtrate, continuously add ammoniacal liquor to adjust pH value to 9, stand reaction a period of time
After filter, remove filtrate, obtain aluminum hydroxide precipitation；Wherein, ammonia concn 28wt%, time of repose 2h.
Embodiment 2
Step (1)：After by aluminium lime-ash grinding screening, washing (deionized water), calcination process is carried out, obtain certain particle size big
Small roasting powder；Wherein, screening condition is 20 mesh；Washing conditions are：90 DEG C of washing temperature, washing time 6h；Roasting condition
For：Roasting time 3.5h, 700 DEG C of sintering temperature.
Step (2)：Roasting powder is added into NaOH solution, after heating and stirring a period of time, solid-liquid is carried out by filtering
Separate, obtain alkali aluminate solution；Wherein, NaOH solution concentration 40wt%, the solid mass ratio 5 of liquid:1, alkali soluble time 4h, alkali soluble temperature
180℃。
Step (3)：Excessive watery hydrochloric acid is added in alkali aluminate solution, is precipitated in observation solution, until precipitation capacity does not become
Change, separation of solid and liquid is then carried out by filtering, obtain AlCl3Filtrate；Wherein, watery hydrochloric acid concentration 25wt%.
Step (4)：In AlCl3In filtrate, continuously add ammoniacal liquor to adjust pH value to 9, stand reaction a period of time
After filter, remove filtrate, obtain aluminum hydroxide precipitation；Wherein, ammonia concn 26wt%, time of repose 1.5h.
Embodiment 3
Step (1)：After by aluminium lime-ash grinding screening, washing (deionized water), calcination process is carried out, obtain certain particle size big
Small roasting powder；Wherein, screening condition is 60 mesh；Washing conditions are：100 DEG C of washing temperature, washing time 6h；Roasting condition
For：Roasting time 3h, 750 DEG C of sintering temperature.
Step (2)：Roasting powder is added into NaOH solution, after heating and stirring a period of time, solid-liquid is carried out by filtering
Separate, obtain alkali aluminate solution；Wherein, NaOH solution concentration 35wt%, the solid mass ratio 6 of liquid:1, alkali soluble time 3.5h, alkali soluble temperature
210℃。
Step (3)：Excessive watery hydrochloric acid is added in alkali aluminate solution, is precipitated in observation solution, until precipitation capacity does not become
Change, separation of solid and liquid is then carried out by filtering, obtain AlCl3Filtrate；Wherein, watery hydrochloric acid concentration 25wt%.
Step (4)：In AlCl3In filtrate, ammoniacal liquor is continuously added to adjust pH value to 8.5, when standing reacts one section
Between after filtering, remove filtrate, obtain aluminum hydroxide precipitation；Wherein, ammonia concn 25wt%, time of repose 1.5h.
Embodiment 4
Step (1)：After by aluminium lime-ash grinding screening, washing (deionized water), calcination process is carried out, obtain certain particle size big
Small roasting powder；Wherein, screening condition is 60 mesh；Washing conditions are：100 DEG C of washing temperature, washing time 5h；Roasting condition
For：Roasting time 2.5h, 800 DEG C of sintering temperature.
Step (2)：Roasting powder is added into NaOH solution, after heating and stirring a period of time, solid-liquid is carried out by filtering
Separate, obtain alkali aluminate solution；Wherein, NaOH solution concentration 30wt%, the solid mass ratio 7 of liquid:1, alkali soluble time 3h, alkali soluble temperature
240℃。
Step (3)：Excessive watery hydrochloric acid is added in alkali aluminate solution, is precipitated in observation solution, until precipitation capacity does not become
Change, separation of solid and liquid is then carried out by filtering, obtain AlCl3Filtrate；Wherein, watery hydrochloric acid concentration 20wt%.
Step (4)：In AlCl3In filtrate, ammoniacal liquor is continuously added to adjust pH value to 8.5, when standing reacts one section
Between after filtering, remove filtrate, obtain aluminum hydroxide precipitation；Wherein, ammonia concn 24wt%, time of repose 1h.
Embodiment 5
Step (1)：After by aluminium lime-ash grinding screening, washing (deionized water), calcination process is carried out, obtain certain particle size big
Small roasting powder；Wherein, screening condition is 80 mesh；Washing conditions are：120 DEG C of washing temperature, washing time 4h；Roasting condition
For：Roasting time 2h, 850 DEG C of sintering temperature.
Step (2)：Roasting powder is added into NaOH solution, after heating and stirring a period of time, solid-liquid is carried out by filtering
Separate, obtain alkali aluminate solution；Wherein, NaOH solution concentration 25wt%, the solid mass ratio 8 of liquid:1, alkali soluble time 2.5h, alkali soluble temperature
270℃。
Step (3)：Excessive watery hydrochloric acid is added in alkali aluminate solution, is precipitated in observation solution, until precipitation capacity does not become
Change, separation of solid and liquid is then carried out by filtering, obtain AlCl3Filtrate；Wherein, watery hydrochloric acid concentration 20wt%.
Step (4)：In AlCl3In filtrate, continuously add ammoniacal liquor to adjust pH value to 8, stand reaction a period of time
After filter, remove filtrate, obtain aluminum hydroxide precipitation；Wherein, ammonia concn 22wt%, time of repose 1h.
Embodiment 6
Step (1)：After by aluminium lime-ash grinding screening, washing (deionized water), calcination process is carried out, obtain certain particle size big
Small roasting powder；Wherein, screening condition is 100 mesh；Washing conditions are：120 DEG C of washing temperature, washing time 3h；Roasting bar
Part is：Roasting time 1h, 900 DEG C of sintering temperature.
Step (2)：Roasting powder is added into NaOH solution, after heating and stirring a period of time, solid-liquid is carried out by filtering
Separate, obtain alkali aluminate solution；Wherein, NaOH solution concentration 20wt%, the solid mass ratio 10 of liquid:1, alkali soluble time 2h, alkali soluble temperature
300℃。
Step (3)：Excessive watery hydrochloric acid is added in alkali aluminate solution, is precipitated in observation solution, until precipitation capacity does not become
Change, separation of solid and liquid is then carried out by filtering, obtain AlCl3Filtrate；Wherein, watery hydrochloric acid concentration 15wt%.
Step (4)：In AlCl3In filtrate, continuously add ammoniacal liquor to adjust pH value to 8, stand reaction a period of time
After filter, remove filtrate, obtain aluminum hydroxide precipitation；Wherein, ammonia concn 20wt%, time of repose 0.5h.
Result shows, the present invention using techniques such as grinding, washing, roasting, alkali soluble, acid treatments, can effectively remove Na, K,
The impurity such as Cl, F, Si, Mg, Fe, Ca, Cu, Mn, obtain purer aluminum hydroxide precipitation, are subsequently to prepare aluminum oxide and other contain
Aluminium product provide high pure raw material, make aluminium lime-ash obtain more fully utilizing, with raw material sources it is wide, environmental pollution is small,
Material consumption energy consumption is low, low cost and other advantages, is suitable for industrialized production.
Claims (6)
1. a kind of method of aluminium lime-ash removal of impurities, it is characterised in that：The method is comprised the following steps：
After aluminium lime-ash is sequentially passed through grinding, screening, washed be calcined and obtain being calcined powder；Powder is calcined with NaOH solution alkali soluble
Material, obtains alkali aluminate solution；Add hydrochloric acid up to precipitation capacity no longer changes in alkali aluminate solution, then separation of solid and liquid obtains rich
Collection has AlCl3Solution；Ammoniacal liquor is passed through in the solution, aluminum hydroxide precipitation is obtained.
2. a kind of method of aluminium lime-ash removal of impurities according to claim 1, it is characterised in that：Methods described specifically includes following step
Suddenly：
1) calcination process will be carried out after the grinding of aluminium lime-ash, screening, washing, obtains being calcined powder；
2) alkali soluble：Roasting powder is added into NaOH solution, then stirring carries out separation of solid and liquid after a period of time in a heated condition,
Obtain alkali aluminate solution；
3) excessive watery hydrochloric acid is added in alkali aluminate solution, is precipitated in observation solution, until precipitation capacity does not change, then carried out
Filtering；
4) in step 3) add ammoniacal liquor regulation pH value to alkalescence in the filtrate that is filtrated to get after stand a period of time, then filter
To aluminum hydroxide precipitation.
3. a kind of method of aluminium lime-ash removal of impurities according to claim 2, it is characterised in that：The step 1) in, screen size
Size is 20~100 mesh；Washing time is 1~8h, and washing temperature is 25~120 DEG C；Sintering temperature is 500~1000 DEG C, roasting
The burning time is 1~6h.
4. a kind of method of aluminium lime-ash removal of impurities according to claim 2, it is characterised in that：The step 2) in, NaOH solution
Concentration be 20~40%；NaOH solution:The mass ratio for being calcined powder is 3:1~12:1；Heating-up temperature is 100~300 DEG C, is stirred
The time is mixed for 2~4h.
5. a kind of method of aluminium lime-ash removal of impurities according to claim 2, it is characterised in that：The step 3) in, watery hydrochloric acid elder generation
With the NaAlO in alkali aluminate solution2And Na2SiO3Reaction generation aluminum hydroxide precipitation and silicic acid precipitation, then excessive watery hydrochloric acid is again
Aluminum hydroxide precipitation is all dissolved, then AlCl is enriched with by being filtrated to get3Solution.
6. a kind of method of aluminium lime-ash removal of impurities according to claim 2, it is characterised in that：The step 4) in, add ammoniacal liquor
The pH value of regulation system is 8~9, and time of repose is 0.5~2h.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108773849A (en) * | 2018-08-23 | 2018-11-09 | 长沙中硅水泥技术开发有限公司 | The System and method for of cement kiln synergic processing Quadratic aluminum dust |
| CN109455748A (en) * | 2018-12-17 | 2019-03-12 | 北京建工金源环保发展股份有限公司 | A method of recycling aluminum nitrate from waste acid liquor |
| CN112111657A (en) * | 2020-09-15 | 2020-12-22 | 江苏海光金属有限公司 | Device for preparing high-purity aluminum by using aluminum ash and using method thereof |
| CN114749468A (en) * | 2022-03-24 | 2022-07-15 | 江西省科学院应用物理研究所 | Process for treating aluminous ash by using villiaumite |
| CN114907109A (en) * | 2021-02-08 | 2022-08-16 | 中国科学院过程工程研究所 | Method for preparing magnesium aluminate spinel by using aluminum ash |
| CN115608001A (en) * | 2022-12-05 | 2023-01-17 | 淄博包钢灵芝稀土高科技股份有限公司 | Recycling process of aged aluminum remover |
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| CN101302021A (en) * | 2008-06-30 | 2008-11-12 | 贵州大学 | Method for extracting aluminum oxide from fly ash |
| CN105314693A (en) * | 2015-12-01 | 2016-02-10 | 仇颖超 | Method for preparing compound water purifying agent from waste aluminum ash |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101302021A (en) * | 2008-06-30 | 2008-11-12 | 贵州大学 | Method for extracting aluminum oxide from fly ash |
| CN105314693A (en) * | 2015-12-01 | 2016-02-10 | 仇颖超 | Method for preparing compound water purifying agent from waste aluminum ash |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108773849A (en) * | 2018-08-23 | 2018-11-09 | 长沙中硅水泥技术开发有限公司 | The System and method for of cement kiln synergic processing Quadratic aluminum dust |
| CN109455748A (en) * | 2018-12-17 | 2019-03-12 | 北京建工金源环保发展股份有限公司 | A method of recycling aluminum nitrate from waste acid liquor |
| CN112111657A (en) * | 2020-09-15 | 2020-12-22 | 江苏海光金属有限公司 | Device for preparing high-purity aluminum by using aluminum ash and using method thereof |
| CN114907109A (en) * | 2021-02-08 | 2022-08-16 | 中国科学院过程工程研究所 | Method for preparing magnesium aluminate spinel by using aluminum ash |
| CN114907109B (en) * | 2021-02-08 | 2023-03-21 | 中国科学院过程工程研究所 | Method for preparing magnesium aluminate spinel by using aluminum ash |
| CN114749468A (en) * | 2022-03-24 | 2022-07-15 | 江西省科学院应用物理研究所 | Process for treating aluminous ash by using villiaumite |
| CN115608001A (en) * | 2022-12-05 | 2023-01-17 | 淄博包钢灵芝稀土高科技股份有限公司 | Recycling process of aged aluminum remover |
| CN115608001B (en) * | 2022-12-05 | 2023-02-21 | 淄博包钢灵芝稀土高科技股份有限公司 | Recycling process of aged aluminum remover |
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Application publication date: 20170531 |
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