CN102586623A - Extracting method and extracting device for high purity aluminum - Google Patents
Extracting method and extracting device for high purity aluminum Download PDFInfo
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- CN102586623A CN102586623A CN2012100701426A CN201210070142A CN102586623A CN 102586623 A CN102586623 A CN 102586623A CN 2012100701426 A CN2012100701426 A CN 2012100701426A CN 201210070142 A CN201210070142 A CN 201210070142A CN 102586623 A CN102586623 A CN 102586623A
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Abstract
An extracting method for high purity aluminum adopts an improved fractional crystallization method. The method includes that molten aluminum is injected into the middle of a primary crystallizer, under a stirring condition, pure aluminum enters a secondary crystallizer from a molten aluminum outlet inclined tube of the primary crystallizer, secondary crystallization is conducted continuously, and third-stage crystallization and fourth-stage crystallization or multi-stage crystallization are conducted till pure aluminum products with purity higher than 99.9995% are obtained. The pure aluminum products are sent to a following production line to be manufactured into high-end aluminum products. Molten aluminum containing impurities can return to a previous-level crystallizer to be purified again. The method is good in pure aluminum separation effect, does not need to melt and heat aluminum bars again, and is low in energy consumption and easy to operate.
Description
Technical field
The invention belongs to the aluminum smelting technology purification techniques, the method for the refined aluminium product of particularly a kind of production purity more than 3N.
Background technology
China is an Aluminum big country; The output of electrolytic aluminum occupies prostatitis, the world; But the most of dependence on import of rafifinal (the aluminium product of purity more than 3N), though in the 2O century 8O age, the domestic research that begins to carry out this respect; But the improvement of production technique only is suitable for the aluminium products production that purity is lower than 3N, to 3N rafifinal Research on Process then relatively slowly.As everyone knows, rafifinal is used in industry such as low temperature electrotechnology, electronic industry and robot calculator, astronomical telescope, petrochemical complex, nuclear power, radar, aerospace, electromobile and semi-conductors widely, and its consumption increases year by year.But the present domestic enterprise that can produce the 3N ultra-pure aluminum of meeting consumers' demand is very few, and the research and development unit is also very few, it is reported to have only only a few producer production purity to reach 99.9 rafifinal by 2010.In the international market; States such as also only virtuous, beautiful, method, Russia, day possess throughput; Therefore domestic required rafifinal major part needs import; Although domestic have enterprise at the trial production ultra-pure aluminum,, there is deficiency in many ways with external similar enterprise and domestic next than big gap is arranged to the ultra-pure aluminum requirement.At first be equipment, the technology relative complex, it utilizes multidisciplinary art, makes cost of investment excessive, and the inconvenience grasp is controlled; Next is to discharge on the impurity efficient, and is unsatisfactory, can not produce specification product; It three is that energy consumption is higher, reaches more than the 15000KWH/ ton, disagrees with national energy-saving and emission-reduction policy, although decrease at present, also has about ten thousand degree; Its four, although produce product, quality is still unstable, and the demestic user can't be used.Specifically; Existing conventional ultra-pure aluminum production heating is all electromagnetic induction heating and stirs synchronously, adopts low-voltage and high-current, and the electrical equipment power factor is less than about O.3; And can't compensate with super-capacitor; A large amount of power consumptions are because the latent heat of fusion of aluminium makes the power consumption more than 80% be used for melting aluminum greater than more than 400 times of specific heat.How solving an above-mentioned difficult problem, is the domestic needs task of top priority.
Report and patent about rafifinal also have, and below retrieve some with regard to us and comment:
1, " mechanical engineering journal " fourth phase in April, 2006; " novel 5N high-purity aluminum purification device principle and control "; Summary: through existing purifying technique of comparative analysis and equipment; In conjunction with the coagulating property of pure metal, independent development has gone out one and has overlapped the equipment and corresponding technology that is applicable to suitability for industrialized production 5N rafifinal.Equipment adopts twin coil two-region Frequency Induction Heating, has obtained higher and adjustable thermograde, and through the computer controlled automatic crystalline speed of growth, the grain form in the control directional freeze has obtained uniform born of the same parents' shape crystalline substance of growth and monocrystalline.Composition detection shows that the aluminium ingot purity of preparation reaches more than 99.9993%, and the impurity element axial distribution is reasonable.Through cutting head and end, then can obtain the qualified finished ingot of massfraction.Document reported method is to adopt twin coil two-region Frequency Induction Heating, belongs to the method for purification and the device of high energy consumption.
2, " foundry engieering " 2008 third phases, Nantong Tai Erde clothes ltd invests 1,000,000 yuan and carries out the tackling key problem of the pure purification techniques of aluminium with Shanghai Communications University's Materials Academy.Through the research trial more than 4 years, the growthhabit through the brilliant material of control aluminium improves the impurity element segregation efficient in the vertical orientation process of setting, thereby improves the cleanliness factor of aluminium matter, successfully develops the ultra-pure aluminum that purity reaches 5N5.Detecting through Shanghai Inst. of Silicate, Chinese Academy of Sciences. product meets international standards fully.It is reported that this method is to adopt segregation method to purify, shortcomings such as lifetime length.
3, Chinese patent title: a kind of purification method of ultra-pure aluminum, the patent No.: 200910309668 patentees: open day: 04 month 21 Granted publication day in 2010: on 05 11st, 2011, invention designer: base, Changhai, Changsha City High & New Technology Industry Development District, Hunan Province North Floor 4; Summary, a kind of purification method of ultra-pure aluminum, it comprises: select refined aluminium purity to be at least 4N6; And Mg＜6ppm wherein; Ti＜0.2ppm, the raw material refined aluminium of Zr＜0.2ppm, and cleaning and drying; The raw material refined aluminium of selecting is packed in the purification furnace, and this purification furnace is airtight, vacuumize, and be heated to 680 ℃-750 ℃ with gas furnace, make the raw material refined aluminium be molten into liquid by solid; The purification furnace that will be heated to 680 ℃-750 ℃ again moves in the crystal growing furnace; This crystal growing furnace heater heats makes the interior constant temperature of crystal growing furnace keep 660 ℃; Aluminium liquid moves at crystal growing furnace well heater internal rotation in the purification furnace; Through the heat dissipation capacity of crystallization control stove, make the aluminium liquid in the purification furnace keep crystallization velocity 5-10cm/h certainly, finish through 4-6 hour post crystallization; With the purification furnace after crystallization cooling, take out the crystallization ingot, remove the 25%-35% of crystallization ingot weight from the afterbody of crystallization ingot, obtain purified aluminum ingot for the first time; Purified aluminum ingot is put into purification furnace more for the first time, repeats to purify, up to the aluminium ingot that obtains to meet purity requirement.
4, Chinese patent title: the method and the smelting furnace thereof of directional freeze purification rafifinal; Application (patent) number: CN201110224938.8; Open (bulletin) number: CN102277505A; Application (patent right) people: Xinjiang Zhonghe Co. Ltd., address: No. 18 scientific and technological management portions of Xinjiang Zhonghe Co. Ltd. in East Road, Keshen, Urumqi City, Xinjiang Uygur Autonomous Regions, invention (design) people: turbulent waves; Make great efforts Gu Yiming; Summary: a kind of method and smelting furnace thereof of directional freeze purification rafifinal; The method of this directional freeze purification rafifinal by select materials with the first step, purifications solidified in the second step melting, the 3rd step, the 4th step acquisition finished product carries out, this smelting furnace comprises furnace shell, heating unit, container, whipping appts and refrigerating unit; At the furnace shell internal fixing container is installed, fixed interval is equipped with many one heating units from top to bottom between furnace shell and container; Furnace bottom place below container is equipped with refrigerating unit, and the furnace bottom temperature measuring equipment is installed between refrigerating unit and furnace shell.The inventive method has the advantage that energy consumption is low, treatment capacity is big, efficient is high, product purity is high, can be used for producing in enormous quantities the rafifinal of 5N to 6N.Smelting furnace reasonable and compact in structure of the present invention, easy to use, it is used through heating unit, bottom cooler, furnace bottom temperature measuring equipment, can greatly increase work efficiency, thereby improve the quality of the rafifinal of purifying.Principal claim: a kind of method of directional freeze purification rafifinal is characterized in that carrying out according to the following steps: the first step, select materials, and select the aluminum feedstock of purity 4N to 5N for use, and the physics cleaning is carried out on the surface of above-mentioned aluminum feedstock; In second step, melting is put into smelting furnace purification container with ready aluminum feedstock in the first step, and aluminum feedstock is heated to 670 ℃ to 730 ℃, makes aluminum feedstock get whole fusings, obtains aluminium liquid; The 3rd the step, solidify purification, with second the step gained aluminium liquid under 670 ℃ to 730 ℃, left standstill 7 minutes to 80 minutes; Then to implementing cooling at the bottom of the smelting furnace; Aluminium liquid is implemented heating; Make the temperature of aluminium liquid upwards be controlled in 660 ℃ to the 700 ℃ scopes from low to high from crystal plane; From the furnace bottom crystallization that makes progress, obtained the crystallization ingot in 1 hour to 8 hours, in the crystallisation process stirring rake preheating oven dry is placed on and implements rotation in the aluminium liquid and stir or/and implement induction stirring; The 4th step obtained finished product, according to the difference of purity demand, removed 15% to 70% part of thickness from the afterbody of crystallization ingot, obtained the rafifinal of required purity.This method exists can only obtain a crystallization ingot at every turn, and energy consumption is high.
5, Chinese patent title: a kind of efficient device for extracting high pure aluminum; Application (patent) number: CN201110264876.3; Open (bulletin) number: CN102321811A; Application (patent right) people: clothing celebrating ripple, address: No. 301,9-2 building, Xinfu District acrobatic skill street, Fushun City, Liaoning Province unit 8, invention (design) people: clothing celebrating ripple; Liu Peng; Clothing Na; Sun Yufei; Clothing celebrating army; Jiang Jie; Former Jianchang; Wang Jingsong; Zhao Zhihao; Wang Shulei; Zhang Ying, summary: a kind of efficient device for extracting high pure aluminum comprises furnace shell, electromagnetism resistance boiler clothing in the furnace shell that is supported on the support and the cylindrical pot body that is centered on by electromagnetism resistance boiler clothing; Electromagnetism resistance boiler clothing be vertical, 12 blades are columnar structured, its top outwards blade end of turnover is power connection end; Described cylindrical pot body is made up of folded top purification compound pot and the bottom purification ingot casting compound pot that drops on together; The feed inlet and outlet of purification compound pot is sealed by blind flange, and its upper outside is provided with supporting cup; The lower end of purification ingot casting compound pot is supported on holder and rises in the mechanism.The upper and lower alternate repetition heating of two pot bodies of this invention is purified, and working efficiency has obtained great lifting.The pot body promote or the decline process in, all the time wherein another pot body is carried out preheating, not only avoided waste of electric energy, waste electric energy and obtained great reduction, but also increased substantially the quality and the output of rafifinal product, reduced running cost.Principal claim: a kind of efficient device for extracting high pure aluminum comprises furnace shell (20), electromagnetism resistance boiler clothing (1) in the furnace shell (20) that is supported on the support (6) and the cylindrical pot body that is centered on by electromagnetism resistance boiler clothing (1); Electromagnetism resistance boiler clothing (1) is that vertical blade is columnar structured, and its top outwards blade end of turnover is power connection end (15); It is characterized in that: described cylindrical pot body is made up of folded top purification compound pot (2) and the bottom purification ingot casting compound pot (3) that drops on together; The feed inlet and outlet of purification compound pot is sealed by blind flange, and its upper outside is provided with supporting cup; The lower end of purification ingot casting compound pot is supported on holder and rises in the mechanism.The device for extracting high pure aluminum of the document belongs to the purifying plant of high energy consumption.
Except the disclosed rafifinal electromagnetism of above-mentioned document resistance furnace smelting process, general rafifinal preparation technology also has condensation method, three layers of liquid electrolytic process, segregation method, unidirectional solidification method, zone melting method and Steppecd crystallization both at home and abroad now.In order to compare several method, we list following technology contrast:
1, condensation method
Aluminium liquid remains on certain temperature, inserts the cooling crystallizer of band water-cooled in the aluminium liquid, will go out the high crystal of purity in crystallization around the mold, through the rotation xln, increases flowing of solid-liquid interface, improves the diffusion effect of solute.The refining effect of this technology is general, but production efficiency is higher.
2, three layers of liquid electrolytic process
Invent in 1901 by Hoopes; So far have the history in more than 100 year; Three layers of liquid electrolytic process purification precision and production efficiency are higher, and the purification precision of three layers of liquid electrolytic process can reach 4～5N, but its energy consumption is big; Simultaneously, in electrolytic process, produce obnoxious flavour and waste electrolyte serious environment pollutions such as hydrogen fluoride, carbon monoxide, sulfurous gas;
3, segregation method
Segregation method is the method that segregation phenomena is purified when utilizing alloy graining, and main method has (1) crystal refining method respectively, (2) directional freeze method for refining.This method can not be produced continuously, and production efficiency is low, and there is secondary pollution in residual aluminum liquid to the aluminium of having purified.France Pu Ji company of packet header Aluminum group company (Pechiney) belongs to the rafifinal project of the throughput 10 k t/a of Nowe power (Novelis) Chinalco introduction at present, goes into operation in December, 2007.
4, unidirectional solidification method
Control the crystalline direction of growth through forcing cooling or heating; Make and solidify direction and deviate from the a kind method of hot-fluid direction of transfer with continuous unidirectional crystallization despumation element; Utilize the technology of induction stirring, the liquid phase in solid/liquid interfaces forward position is carried out enforceable stirring, can reduce the thickness of solute enriched layer in the liquid phase of forward position, interface; Help the diffusion of solute, improve the efficient of purifying.
5, zone melting method
Be the main method of purification rafifinal, mainly be used for producing the ultra-pure aluminum of 5N5～6N5.The investigator of Japan has carried out dark people's research to this technology, has finally obtained the fine aluminium of 7N.
In the above-mentioned several kinds of technologies; Because 3 layers of liquid electrolytic process production rafifinal energy consumption are big; States such as the U.S., Canada, Germany, Japan, France and Russia, most rafifinal product more and more trends towards utilizing segregation legal systems such as unidirectional solidification or fractional crystallization to be equipped with, with the billet supply the market.
Described Steppecd crystallization is fine aluminium a kind of novel method of smelting always, and it is that molten aluminium temperature in the crucible is remained near the fusing point, in melt, inserts the mold of water-cooled; Impel crystal on mold, to grow; When crystal growth to a certain degree, adopt scrape division with the crystalline solids accumulation to crucible bottom, squeeze the liquid that is rich in impurity to the lower melting point of wrapping up between crystal through insulation again and extrude; This kind method can make 80 of primary aluminum amount obtain refining, and purity can be brought up to 4 N5 by 3 N5.It is following that the 8th phase of " light metal " nineteen ninety is introduced the Steppecd crystallization working method in detail.The plumbago crucible of packing into as the electrolysis primary aluminum liquid of raw material, the gas cooling aluminium liquid in the graphite cooling tube, crystallization goes out primary crystal around cooling tube.Then, the ring-type plunger is pumped, the primary crystal around the cooling tube is scraped the below, and with plunger to the crystallizing cycle that scrapes the below apply little force of compression.In this technological process, little crystallization sintering becomes big crystallization.The big crystallization of part is fused again, and by the plunger compression, the mother that the contaminated liquids that lattice is asked is pressed against the top steeps part.Owing to carry out this operation repeatedly, highly purified solid layer separated with the liquid level that contains impurity.The primary aluminum that drops into has approximately 80% can be by refining, and refining process finishes can to adopt a refining unit that fascinates to discharge and contains the assorted liquid level of determining of matter, perhaps treat whole metal freezings after, the impure part on excision refining ingot casting top just obtains rafifinal.
But the Steppecd crystallization of above-mentioned introduction is owing to need to use the ring-type plunger, the operating process more complicated, and be not easy to control the crystallization of fine aluminium.
Summary of the invention
The purpose of this invention is to provide and a kind of improved Steppecd crystallization is carried out the method and apparatus of aluminium purifying, can access the above fine aluminium product of 99.9 (3N) through present method and device, present method energy consumption is low, easily operation.
To achieve these goals, the present invention has adopted the method for improved fractional crystallization, and it is the middle part of molten aluminum liquid (aluminium water) being injected the one-level mold; Under suitable temperature, fine aluminium begins crystallization (not arriving zero pour), and density diminishes; Rising (come-up) is to the top of mold, and the metal of impurity does not arrive Tc, then is deposited to the middle and lower part of mold; Aluminium liquid from mold under stirring condition exports the inclined tube; Under the effect of gravity, get into the middle part of secondary crystallization device, the temperature of crystallization control device is proceeded secondary crystal; Carry out three grades, level Four or multistage crystallization always; Just can obtain the above rafifinal of 99.9-99.99, deliver to follow-up production line and make high-end aluminum products, for example do the matrix metal etc. of stable conductor, disk alloy and the high-fracture toughness duraluminum of anode foils that electrolytic condenser uses, capacitor lead wire, unicircuit lead, vacuum-evaporation material, superconductor; In the whipping process of secondary crystallization device, three grades of molds or the above mold of level Four, except fine aluminium can move forward, the impure aluminium fluid power of part is enough to return the previous stage mold from aluminium liquid outlet inclined tube, purifies again; The impure aluminium liquid of part also can be discharged from the impurity aluminum outlet pipe of back one-level mold bottom; Return the previous stage mold through valve and continue operation; Through multi-stage mold, the impurity of last step concentration in the reach process increases, and makes fine aluminium to purify by successive; There is the aluminium liquid of more impurity to deliver to the impurity aluminum container, can regularly delivers to the impurity aluminum container, as producing common aluminium, the for example raw material of door and window aluminium section bar, aluminum pot, bike aluminium section bar or general industry aluminum products through valve;
In order to preserve the fine aluminium crystal, the temperature of second mold needs close with the temperature of first container, can control through mold inner well heater and TP;
In successive purification fine aluminium process, aluminium liquid analytical sampling mouth or automatic metal analysis of components transmitter can be established in the top of each grade mold, middle part or bottom, control the molten metal aluminium content of each grade mold at any time.
The process for extracting of rafifinal of the present invention can adopt vacuum operating, perhaps drops into nitrogen or argon gas and gets into crystallizer operation.
The fusing point of fine aluminium is 660 ℃ in theory; Can under 670 ℃-680 ℃ temperature, produce crystallization in heater heats to 690-700 ℃ so inject the aluminium liquid of one-level mold, density diminishes after the fine aluminium crystallization; Under stirring condition, export the inclined tube from aluminium liquid; Under the effect of gravity, get into the middle part of secondary crystallization device, the temperature of aluminum liquid that there is impurity the mold below is also more than fusing point, and what the fine aluminium content of secondary crystallization device maybe be than one-level mold is low; Can return process furnace through valve A, get into one-level mold recrystallization once more.
The equipment that process for extracting adopted of rafifinal of the present invention comprises process furnace, aluminium liquid storage tank, the mold more than 2 or 2, fine aluminium container and impurity aluminum container, and process furnace is delivered to the one-level mold with the heating of aluminium liquid; There is aluminium liquid inlet tube at one-level mold middle part; Aluminium liquid outlet inclined tube is arranged at every grade of mold top, leads to the middle part of next stage mold, and impurity aluminum outlet pipe and valve are arranged at the mold bottom; Each mold bottom impurity aluminum can pool together; Return process furnace through valve, get into one-level mold recrystallization once more, perhaps connect the impurity aluminum container and connect common aluminium production line.
In the extraction equipment of rafifinal of the present invention, each mold is all installed whisking appliance, can adopt mechanical stirrer and magnetic stirrer.
In order to make mold fine aluminium crystallization outlet to flow, can establish heating unit, TP and chemical ingredients detecting sensor in the mold bottom, to the heating of crystalline aluminium liquid, make the temperature and the composition of its smooth crystallization control device and grasp the crystalline time.
The extraction equipment of rafifinal of the present invention can adopt vacuum operating, perhaps drops into the operation of nitrogen or argon gas, and concrete equipment is identical with the non-oxygen smelting structural principle that other Metal smelting is adopted, and is not described in detail here.
The principle of work of the extraction equipment of rafifinal of the present invention:
After material gets into mold from the centre; Produce crystal at crystallized region, under stirring condition, a part of crystalline fine aluminium is from the outlet inclined tube; Flow to the next stage mold; Impurity aluminum can be through the outlet inclined tube along with rising be back to the mold of previous stage, and perhaps the impurity aluminum outlet pipe of one-level mold bottom is discharged from the back, returns the previous stage mold through valve and continues operation.
Continuous multi-stage fractional crystallization and single-stage crystalline relation are similar to chemical substance rectifying and single-stage distillatory relation.
Utilize method of the present invention; Can be with the aluminium ingot that contains multiple elements such as Si, Fe, Cu, Pb, Zn, Ca, Ti, Cd, Ag, In through isolating the above fine aluminium product of 99.9-99.999 (5N) after the fractional crystallization; Good separating effect; Do not need the heating of fusion again aluminium bar, process has been saved mass energy.
Beneficial effect of the present invention:
1, the process for extracting of rafifinal of the present invention is actually improved Steppecd crystallization, and existing Steppecd crystallization is that fine aluminium cooling at once after the mold crystallization is taken out, and obtains aluminium bar; Obtain the chemical content data of each one of aluminium bar through analysis, use the mechanically cutting impurity aluminum then, so both wasted the energy; The aluminium bar that obtains is also irregular, the weak point that has, the length that has; It is inconsistent to produce the refined aluminium product composition, sometimes also fusion heating again.
2, the extraction equipment of rafifinal of the present invention can utilize existing aluminium melting equipment to improve, as long as the mold insulation is good, operates easily, and by-pass valve control can adopt computer control mode, accomplishes robotization control.
Description of drawings
Fig. 1 is technical process and the annexation figure of equipment of the process for extracting of rafifinal of the present invention.
Fig. 2 is the phasor that contains the aluminum silicon alloy purification aluminium of 3.0% silicon.
Sequence number and component names among the figure: 1, process furnace, 2, aluminium liquid storage tank, 3, aluminium liquid inlet tube, 4, the one-level mold; 5, aluminium liquid outlet inclined tube, 6, the secondary crystallization device, 7, three grades of molds; 8, level Four mold, 9, the refined aluminium product line, 10, valve; 11, well heater, 12, TP, 13, whisking appliance; 14, impurity aluminum outlet pipe; 15, impurity aluminum container; 16, common aluminium production line; 17, impurity aluminum recycle control valve.
As shown in Figure 1, extraction equipment comprises that process furnace 1, aluminium liquid storage tank 2, four molds are one-level mold 4 respectively; 6, three grades of molds 7 of secondary crystallization device, level Four mold 8; Aluminium liquid inlet tube 3 is located at the mold middle part, and the previous stage mold has aluminium liquid outlet inclined tube 5 to be connected with the back level; Impurity aluminum outlet pipe 14 is arranged at the mold bottom, and impurity aluminum outlet pipe 14 is equipped with impurity aluminum recycle control valve 17, connects refined aluminium product line 9 behind the level Four mold 8, and the impurity aluminum outlet pipe is all arranged at every grade of mold bottom; Can take back process furnace 1 through impurity aluminum recycle control valve 17 and valve 10, perhaps connect impurity aluminum container 15 and connect common aluminium production line 16 then; Also can impurity aluminum be returned the prime mold from the aluminium liquid outlet inclined tube 5 of mold.
Mold inside is equipped with well heater 11, TP 12 and whisking appliance 13.
Embodiment
Embodiment 1
The aluminium ingot that fused is contained multiple elements such as Si, Fe, Cu, Pb, Zn, Ca, Ti, Cd, Ag, In is put into vacuum heater and is heated to 690-700 ℃, obtains aluminium liquid, contains the middle part of injecting the one-level mold; Under 670 ℃-680 ℃ temperature, produce crystallization, fine aluminium after the crystallization is deposited in the bottom of one-level mold because density is bigger; The temperature of aluminum liquid that there is impurity mold top also more than fusing point, floats over the top of one-level mold, and delivers to the secondary crystallization device; Proceed crystallization, the fine aluminium after the same crystallization is deposited in the bottom of secondary crystallization device, and the aluminium liquid that contains impurity floats over the top of secondary crystallization device; And deliver to three grades of molds; Through three grades or level Four mold, the aluminium liquid that will contain more impurity is delivered to the impurity aluminum container, promptly as the raw material of production general industry aluminum products; Be deposited in the fine aluminium of molds at different levels bottom, can further return process furnace, get into the mold recrystallization once more through valve A; Through recrystallization several times; Obtain the fine aluminium product more than 99.99 at last, deliver to the refined aluminium product line, make high-end aluminum products through valve B.Can analyze each element of one-level mold bottom different heights with the GDMS method.
Shown in Figure 2, contain in the phasor of aluminum silicon alloy of 3.0% silicon, vertical arrows shows to be formed.It resolves into two parts along with alloy graining: solids component moves to phasor and leans on the aluminium direction, and impure integral part moves to right-hand.This process be physically commonly known 634 ℃ all reach the balance of temperature.On the pure one side of figure about 30% material is arranged then, its Si content is 0.5%; At the other side 70% material is arranged, its Si content is 4.0%.This is the typical case who occurs in batch of process, and impure is higher than pure mark far away, and degree of purification is less relatively.Through four crystallizations, can obtain the fine aluminium product more than 99.99.
Claims (9)
1. the process for extracting of rafifinal, it is characterized in that: adopt the method for improved fractional crystallization, it is the middle part of molten aluminum liquid being injected the one-level mold; Under the crystalline temperature, fine aluminium density diminishes, and rises to the top of mold; And the alloy of impurity is deposited to the middle and lower part of mold, and the fine aluminium crystallization gets into the middle part of secondary crystallization device from the aluminium liquid outlet inclined tube of mold under stirring condition; The temperature of crystallization control device is proceeded secondary crystal, carries out three grades, level Four or multistage crystallization always; Obtain rafifinal, deliver to follow-up production line and make high-end aluminum products, in the whipping process of secondary crystallization device, three grades of molds or the above mold of level Four; Except fine aluminium can move forward, the impure aluminium liquid of part returned the previous stage mold, purifies again; There is the aluminium liquid of more impurity to deliver to the impurity aluminum container, regularly delivers to the impurity aluminum container, as producing common aluminium through valve.
2. the process for extracting of rafifinal according to claim 1 is characterized in that: the temperature of second mold needs close with the temperature of first container, controls through well heater and TP that mold is inner.
3. the process for extracting of rafifinal according to claim 1; It is characterized in that: aluminium liquid analytical sampling mouth or automatic metal analysis of components transmitter can be established in the top of each grade mold, middle part or bottom, control the molten metal aluminium content of each grade mold at any time.
4. the process for extracting of rafifinal according to claim 1; It is characterized in that: the operation that impure aluminium liquid returns the previous stage mold is to pool together through aluminium liquid outlet inclined tube or from the mold bottom; Return process furnace through valve; Get into prime mold recrystallization once more, perhaps connect the impurity aluminum container and connect common aluminium production line.
5. the process for extracting of rafifinal according to claim 1 is characterized in that: process for extracting adopts vacuum operating, perhaps drops into nitrogen or argon gas and gets into crystallizer operation.
6. the equipment that process for extracting adopted of rafifinal as claimed in claim 1, it is characterized in that: it comprises process furnace, aluminium liquid storage tank, several molds, fine aluminium container and impurity aluminum container; Process furnace is delivered to the one-level mold with the heating of aluminium liquid, and there is aluminium liquid inlet tube at one-level mold middle part, and aluminium liquid outlet inclined tube is arranged at every grade of mold top; Lead to the middle part of next stage mold; Impurity aluminum outlet pipe and valve are arranged at the mold bottom, and each mold bottom impurity aluminum pools together, and connects process furnace through valve; Get into the one-level mold, perhaps connect the impurity aluminum container and connect common aluminium production line.
7. the equipment that process for extracting adopted of rafifinal according to claim 6, it is characterized in that: each mold is all installed whisking appliance, adopts mechanical stirrer and magnetic stirrer.
8. the equipment that process for extracting adopted of rafifinal according to claim 6 is characterized in that: be provided with heating unit, TP and chemical ingredients detecting sensor in the mold bottom.
9. the equipment that process for extracting adopted of rafifinal according to claim 6, it is characterized in that: mold is connected with vacuum system, perhaps is connected with the equipment that nitrogen or argon gas are provided.
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| CN112794364A (en) * | 2021-01-12 | 2021-05-14 | 北京科技大学 | Method for separating vanadium pentoxide by two-stage melting crystallization |
| CN113403487A (en) * | 2021-07-24 | 2021-09-17 | 南通泰德电子材料科技有限公司 | High-purity aluminum purification device and purification method thereof |
| CN114717425A (en) * | 2022-04-15 | 2022-07-08 | 济源职业技术学院 | Multi-stage melt crystallizer and crystallization method |
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| CN104004925A (en) * | 2014-06-11 | 2014-08-27 | 李霞 | High-purity aluminum continuous purifying device |
| CN104120280A (en) * | 2014-07-31 | 2014-10-29 | 上海交通大学 | Method for removing impurity element zinc out of secondary aluminum melt |
| CN106868316A (en) * | 2017-02-10 | 2017-06-20 | 上海交通大学 | A kind of polynary impurity element synchronous purification method and device of secondary aluminium |
| CN112794364A (en) * | 2021-01-12 | 2021-05-14 | 北京科技大学 | Method for separating vanadium pentoxide by two-stage melting crystallization |
| CN113403487A (en) * | 2021-07-24 | 2021-09-17 | 南通泰德电子材料科技有限公司 | High-purity aluminum purification device and purification method thereof |
| CN114717425A (en) * | 2022-04-15 | 2022-07-08 | 济源职业技术学院 | Multi-stage melt crystallizer and crystallization method |
| CN115196656A (en) * | 2022-08-26 | 2022-10-18 | 华中科技大学鄂州工业技术研究院 | CsBr purification method |
| CN115196656B (en) * | 2022-08-26 | 2023-09-19 | 华中科技大学鄂州工业技术研究院 | CsBr purifying method |
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