CN101928948A - Recovery process of alkaline washing residual liquid for aluminum profile extrusion die - Google Patents
Recovery process of alkaline washing residual liquid for aluminum profile extrusion die Download PDFInfo
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Abstract
The invention provides a recovery process of alkaline washing residual liquid for an aluminum profile extrusion die, and relates to the recovery process of aluminum scrap bonded on the aluminum processing die. The recovery process comprises the following steps: boiling the die with alkali liquid in an alkaline washing tank to dissolve out an aluminum alloy in a die cavity; b. precipitating white aluminum hydroxide from the residual alkali liquid through reaction for three times; c. re-dissolving, adding the gray residual liquid to the recovered alkali clear liquid, and heating until the obtained mixed solution is blackened and diluted; d. carrying out flocculation and sediment; and e. decomposing seed crystal. The recovery process has the following beneficial effects of meeting the national pollution emission standards, thus having no environmental pollution, achieving recovery and reutilization of sodium hydroxide, thus saving alkaline washing production cost, and achieving recovery of aluminum hydroxide, thus enhancing resource recovery and reutilization.
Description
Technical field
The invention belongs to non-ferrous metal processing and manufacturing technical field, relate to a kind of agglutinating aluminium scrap recovery technology on the aluminum profile extrusion die.
Background technology
At present, in aluminium section bar processing enterprise, aluminium alloy extruded mould after die trial repair a die and produce after the replacing process in, all to go into alkali lye heat and boil, make molten the removing of aluminium alloy in the mold cavity, so that the separation of mould, dismantle and ressemble.
In actual production, the capacity of aluminium promptly can not use after reaching every liter 50 gram in alkali lye, becomes raffinate.If be discharged, both polluted environment, wasted a large amount of resources simultaneously again.
Summary of the invention
The objective of the invention is: a kind of recovery technology of alkaline washing residual liquid for aluminum profile extrusion die is provided, and this technology can be carried out alkali lye neutralizing treatment and to the recovery of aluminum metal.
Method of the present invention is:
Mould boils through alkali lye heat in alkaline bath, make molten the removing of aluminium alloy in the mold cavity after, the solution composition in the alkaline bath is NaOH 20～30% (weight ratio), water 70～80% (weight ratio), 120 ℃ of temperature, normal pressure proportion 1.22～1.331, degree Beaume 26～36.
Residual alkali lye: when appearance aluminium amount reached 50 grams per liters, the color of raffinate was grey, taupe brown.The chemical reaction of finishing in alkaline cleaning procedure is:
Al
2O
3+2NaOH＝2NaAlO
2+H
2O
2Al+6H
2O＝2Al(OH)
3↓+3H
2↑
When first initial reaction, aluminum oxide of aluminum alloy surface (Al2O3) and NaOH reaction generate sodium metaaluminate (NaAlO2), then are second reactions, have generated aluminum hydroxide precipitation, because aluminium hydroxide is white, present gradually.But these aluminium hydroxides have become sodium metaaluminate again in back to back the 3rd reaction, and sodium metaaluminate is dissolved in NaOH, and white aluminium hydroxide disappears, and reach full fashionable when holding the aluminium amount, continue dissolving again.Particularly add after the clear water, the 3rd reaction then carried out left, i.e. the aluminum hydroxide precipitation of adularescent.And present grey or taupe brown, and this is because be added in the groove, and its composition is silicon, magnesium, copper, iron, zinc, chromium etc., and industrial sodium hydroxide contains 1～4% impurity in addition, is calcium, magnesium, sodium, potassium etc.
Wherein silicon is two kinds of colors (silicon metal is a black, and noncrystalline free silica is brown).Because of the content of silicon is big, be again black, then the silicon metal of black is exactly a grey with mixing of white aluminium hydroxide, and partial crystallization silicon becomes free silica, is exactly taupe.
Heavy molten: heavy molten purpose is exactly to dissolve in the aluminium hydroxide that the satiety symphysis becomes in the sodium hydroxide again, the color that makes raffinate is by grey blackening, and other alloying element in the residual alkali lye scarcely is dissolved in NaOH solution, this just can go out these alloying elements and its compound separation with sedimentary method, forms slag.
Heavy solubility temperature is high more, good more.Because the high more dissolved aluminium hydroxide of temperature is many more, solution is also rare, the easy more precipitation of other alloying element (slag).The grey raffinate is pumped into heavy fluid bowl, add and reclaim the alkali clear liquid, the weight ratio that reclaims alkali and grey raffinate is 1: make the solution blackening more than the 10-13, reheat to 120 ℃, thinningly promptly finish.
Flocculation sediment: flocculation agent also is settling agent.Because the alloying element in the raffinate and other impurity all are graininesses.Natural sedimentation is very slow, for quickening this process, selects sodium polyacrylate or poly-propionyl ammonium a kind of, and add-on is to treat 0.33～1% of flocculation sediment solution weight.
Decomposition of crystal seed: the direct pump of solution after the throw out removal is arrived the decomposition of crystal seed groove, add clear water to degree Beaume and reach 25%, add crystal seed again, add-on is to treat 0.5～1% of flocculation sediment solution weight, be incubated 62-68 ℃, promptly become the liquid that contains aluminium hydroxide after 48 hours, the aluminium hydroxide product is deposited in the decomposition cylinder bottom, sodium hydroxide then is dissolved in the solution, and it is standby to pump into the clear liquid groove by top.
The washing of aluminum oxide and classification: the washing of aluminium hydroxide is that the residual alkali of taking away is reclaimed as much as possible, makes the Na2O index of aluminium hydroxide reach standard-required.
So-called classification is exactly that coarse grain is down in the precipitation process, and particulate is last, fine flour is collected do crystal seed, accelerates forming core and nuclear coarsening rate.Coarse grain is as product by heating to 105 ℃, i.e. the moisture that evaporation contains.Product aluminium hydroxide.Reheat to 350 ℃ must aluminum oxide.
The invention has the beneficial effects as follows: accomplished national emission standard, environment is not produced pollution, reclaimed sodium hydroxide and utilize again, saved the production cost of alkali cleaning, reclaimed aluminium hydroxide, made the resource recycling use.
Embodiment
Embodiment 1:
Go out the 2.8T raffinate from mold slots,, add and reclaim alkali clear liquid 233kg, be heated to more than 120 ℃ to heavy fluid bowl.Be black after 2 hours, pump into the flocculation sediment cylinder, add hot water to degree Beaume 25～30%, and add flocculation agent 9.24kg, precipitation was finished in 4～6 hours.Pump clear liquid (top) is gone into decomposition of crystal seed cylinder (band stirs), and adds 5～10kg crystal seed (increase nucleation rate).The decomposition of crystal seed cylinder keeps 65 ℃, stirs 48 hours, pumps into precipitation tank for precipitation 4～12 hours, the top sodium hydroxide solution is pumped into the clear liquid groove continue to employ, and does the mould alkaline bath and replenishes liquid.The bottom throw out is for reclaiming product aluminium hydroxide, use heat water washing and classification.Washing is further to reclaim alkali lye, reduces aluminium hydroxide Na2O content, makes it up to standard.Classification is that thickness is separated, and fine flour is used as crystal seed, and coarse grain is a product, the electrolytic efficiency height.
Residue also is to reclaim sodium hydroxide to the clear liquid groove through washing in the flocculation sediment groove.Throw out after the washing runs off for preventing micro-alkali, be neutralized to PH7～8 with hydrochloric acid, and the scavenging solution after the neutralization contains salt, and the evaporation back is an Industrial Salt, and this moment, throw out reached national solid refuse emission standard.
First preparation with crystal seed
Extract 1 cubic metre of clear liquid to container from the flocculation sediment groove, add water to degree Beaume 20～25%, be positioned over 3～5, can nature sucking-off fine-grained aluminum hydroxide.Upper clear supernate pumps into the clear liquid groove.The bottom throw out is crystal seed (fine-grained aluminum hydroxide), weighs after the drying, as crystal seed.
Claims (1)
1. the recovery technology of an alkaline washing residual liquid for aluminum profile extrusion die, its technology is:
A, mould boil through alkali lye heat in alkaline bath, make molten the removing of aluminium alloy in the mold cavity after, the solution composition in the alkaline bath is NaOH weight ratio 20～30%, water weight ratio 70～80%, 120 ℃ of temperature, normal pressure proportion 1.22～1.331, degree Beaume 26～36.
B, residual alkali lye, when appearance aluminium amount reached 50 grams per liters, the color of raffinate was grey, taupe brown.The chemical reaction of finishing in alkaline cleaning procedure is:
Al
2O
3+2NaOH＝2NaAlO
2+H
2O
2Al+6H
2O＝2Al(OH)
3↓+3H
2↑
When first initial reaction, aluminum oxide of aluminum alloy surface (Al2O3) and NaOH reaction generate sodium metaaluminate, then be second reaction, generated aluminum hydroxide precipitation, aluminium hydroxide has become sodium metaaluminate again in back to back the 3rd reaction, and sodium metaaluminate is dissolved in NaOH, and white aluminium hydroxide disappears, reach full fashionable when holding the aluminium amount, continue dissolving again.Particularly add after the clear water, the 3rd reaction then carried out left, i.e. the aluminum hydroxide precipitation of adularescent.
C, heavy molten pumps into heavy fluid bowl with the grey raffinate, adds and reclaims the alkali clear liquid, and the weight ratio that reclaims alkali and grey raffinate is 1: make the solution blackening more than the 10-13, reheat to 120 ℃, thinningly promptly finish.
D, flocculation sediment select sodium polyacrylate or poly-propionyl ammonium a kind of, and add-on is to treat 0.33～1% of flocculation sediment solution weight.
E, decomposition of crystal seed, the direct pump of solution after the throw out removal is arrived the decomposition of crystal seed groove, add clear water to degree Beaume and reach 25%, add crystal seed again, add-on is to treat 0.5～1% of flocculation sediment solution weight, is incubated 62-68 ℃, promptly become the liquid that contains aluminium hydroxide after 48 hours, the aluminium hydroxide product is deposited in the decomposition cylinder bottom, and sodium hydroxide then is dissolved in the solution, and it is standby to pump into the clear liquid groove by top.
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| CN 201010273267 CN101928948A (en) | 2010-09-02 | 2010-09-02 | Recovery process of alkaline washing residual liquid for aluminum profile extrusion die |
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| CN 201010273267 CN101928948A (en) | 2010-09-02 | 2010-09-02 | Recovery process of alkaline washing residual liquid for aluminum profile extrusion die |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106367791A (en) * | 2016-11-11 | 2017-02-01 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | Alkaline three-in-one grinding process capable of integrating pretreatment of aluminum with on-line recycle of aluminum hydroxide |
| CN106367792A (en) * | 2016-11-11 | 2017-02-01 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | Aluminum pretreatment alkaline three-in-one online recycling system for demolding alkaline liquor for extruding mold aluminum material heads and aluminum hydroxide |
| CN106757268A (en) * | 2016-11-11 | 2017-05-31 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | The aluminium pre-treatment three-in-one and alkali liquid regeneration of alkalescence and aluminium hydroxide online recycling technique |
| CN106906478A (en) * | 2017-05-05 | 2017-06-30 | 江苏佳铝实业股份有限公司 | Mold container is boiled in a kind of energy-conserving and environment-protective |
| CN107986308A (en) * | 2017-12-29 | 2018-05-04 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | A kind of workshop system and technique for stewing mould liquid production aluminium hydroxide |
| CN108069449A (en) * | 2017-12-29 | 2018-05-25 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | The method that Aluminum subtracts the devil liquor recovery aluminium hydroxide and sodium hydroxide of slag |
| CN108149017A (en) * | 2017-12-29 | 2018-06-12 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | A kind of mould liquid that stews replaces Alkaline etchant and recycles the system and technique of aluminium hydroxide |
| CN108160737A (en) * | 2017-12-26 | 2018-06-15 | 于沛洲 | Extruding die for aluminum shaped material alkali-washing waste liquid recovery processing technique |
| CN108569714A (en) * | 2018-04-17 | 2018-09-25 | 郝亚明 | It improves and decomposes aluminium hydroxide micro powder resolution ratio method |
| CN108796596A (en) * | 2018-04-11 | 2018-11-13 | 方明环保科技(漳州)有限公司 | Aluminium section bar production mould accumulates the removal device and its minimizing technology of aluminium |
| CN108975295A (en) * | 2018-07-27 | 2018-12-11 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | Mould liquid, which is stewed, in a kind of processing of aluminium recycles the method containing aluminium Yu sodium byproduct |
| CN113816527A (en) * | 2021-09-28 | 2021-12-21 | 江苏凯莱德环保科技有限公司 | Novel treatment method for recycling and reusing aluminum die-breaking alkaline washing wastewater |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4136026A (en) * | 1977-11-23 | 1979-01-23 | Aluminum Company Of America | Caustic solution having controlled dissolved aluminum content |
| EP0465822A1 (en) * | 1990-07-06 | 1992-01-15 | The Graver Company | Recovery of sodium hydroxide and aluminium hydroxide from etching waste |
| CN1111682A (en) * | 1994-04-01 | 1995-11-15 | 日本轻金属株式会社 | Process for treating waste liquid in surface treatment of aluminum materials |
| CN1121539A (en) * | 1994-06-21 | 1996-05-01 | 日本轻金属株式会社 | Aluminium soaking processing |
| US5985165A (en) * | 1995-11-02 | 1999-11-16 | Fuji Photo Film Co., Ltd. | Process for the purification of aluminum hydroxide and process for the surface treatment of aluminum plate utilizing the purification process |
-
2010
- 2010-09-02 CN CN 201010273267 patent/CN101928948A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4136026A (en) * | 1977-11-23 | 1979-01-23 | Aluminum Company Of America | Caustic solution having controlled dissolved aluminum content |
| EP0465822A1 (en) * | 1990-07-06 | 1992-01-15 | The Graver Company | Recovery of sodium hydroxide and aluminium hydroxide from etching waste |
| CN1111682A (en) * | 1994-04-01 | 1995-11-15 | 日本轻金属株式会社 | Process for treating waste liquid in surface treatment of aluminum materials |
| CN1121539A (en) * | 1994-06-21 | 1996-05-01 | 日本轻金属株式会社 | Aluminium soaking processing |
| US5985165A (en) * | 1995-11-02 | 1999-11-16 | Fuji Photo Film Co., Ltd. | Process for the purification of aluminum hydroxide and process for the surface treatment of aluminum plate utilizing the purification process |
Non-Patent Citations (1)
| Title |
|---|
| 《安徽工业大学学报》 20010731 朱静等 铝碱蚀废液再生及铝的回收 第232-234页 第18卷, 第3期 2 * |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106367791B (en) * | 2016-11-11 | 2018-10-02 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | Aluminium pre-treatment and aluminium hydroxide online recycling and the three-in-one frosting technology of alkalinity |
| CN106367792A (en) * | 2016-11-11 | 2017-02-01 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | Aluminum pretreatment alkaline three-in-one online recycling system for demolding alkaline liquor for extruding mold aluminum material heads and aluminum hydroxide |
| CN106757268A (en) * | 2016-11-11 | 2017-05-31 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | The aluminium pre-treatment three-in-one and alkali liquid regeneration of alkalescence and aluminium hydroxide online recycling technique |
| CN106367791A (en) * | 2016-11-11 | 2017-02-01 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | Alkaline three-in-one grinding process capable of integrating pretreatment of aluminum with on-line recycle of aluminum hydroxide |
| CN106906478A (en) * | 2017-05-05 | 2017-06-30 | 江苏佳铝实业股份有限公司 | Mold container is boiled in a kind of energy-conserving and environment-protective |
| CN108160737A (en) * | 2017-12-26 | 2018-06-15 | 于沛洲 | Extruding die for aluminum shaped material alkali-washing waste liquid recovery processing technique |
| CN108069449A (en) * | 2017-12-29 | 2018-05-25 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | The method that Aluminum subtracts the devil liquor recovery aluminium hydroxide and sodium hydroxide of slag |
| CN108149017A (en) * | 2017-12-29 | 2018-06-12 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | A kind of mould liquid that stews replaces Alkaline etchant and recycles the system and technique of aluminium hydroxide |
| CN107986308A (en) * | 2017-12-29 | 2018-05-04 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | A kind of workshop system and technique for stewing mould liquid production aluminium hydroxide |
| CN107986308B (en) * | 2017-12-29 | 2019-10-01 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | A kind of workshop system and technique stewing mould liquid production aluminium hydroxide |
| CN108796596A (en) * | 2018-04-11 | 2018-11-13 | 方明环保科技(漳州)有限公司 | Aluminium section bar production mould accumulates the removal device and its minimizing technology of aluminium |
| CN108569714A (en) * | 2018-04-17 | 2018-09-25 | 郝亚明 | It improves and decomposes aluminium hydroxide micro powder resolution ratio method |
| CN108975295A (en) * | 2018-07-27 | 2018-12-11 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | Mould liquid, which is stewed, in a kind of processing of aluminium recycles the method containing aluminium Yu sodium byproduct |
| CN108975295B (en) * | 2018-07-27 | 2020-06-23 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | Method for recovering aluminum and sodium-containing byproducts from mold-cooking liquid in aluminum processing |
| CN113816527A (en) * | 2021-09-28 | 2021-12-21 | 江苏凯莱德环保科技有限公司 | Novel treatment method for recycling and reusing aluminum die-breaking alkaline washing wastewater |
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Open date: 20101229 |