CN108083305A - A kind of system and technique for stewing mould liquid recycling aluminium hydroxide - Google Patents
A kind of system and technique for stewing mould liquid recycling aluminium hydroxide Download PDFInfo
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- CN108083305A CN108083305A CN201711471631.1A CN201711471631A CN108083305A CN 108083305 A CN108083305 A CN 108083305A CN 201711471631 A CN201711471631 A CN 201711471631A CN 108083305 A CN108083305 A CN 108083305A
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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
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
- C01P2006/82—Compositional purity water content
Abstract
The present invention relates to a kind of system for stewing mould liquid recycling aluminium hydroxide, including stewing mould liquid collection system, stewing mould liquid treating system, stew mould liquid separation system and stew mould liquid and react recovery system again with water；Pot mould liquid collection system includes stewing mould liquid recycling can and No.1 pump；Pot mould liquid collection system stews mould liquid for collecting；Pot mould liquid treating system includes retort, No. two pumps and aluminium hydroxide crystal seed holding vessel；The mould liquid treating system that stews is used to carry out the chemical reaction for stewing mould liquid and produces aluminium hydroxide；Pot mould liquid separation system includes recycling can and centrifuge；Pot mould liquid reacts recovery system with water again includes Sewage treatment tank and No. three pumps；Pot mould liquid reacts recovery system with water for the waste water after separation of solid and liquid to be recycled again；The present invention improves the recovery utilization rate of Aluminum waste residue, while solves the problems, such as easy fouling using mould liquid recycling sodium hydroxide is stewed.
Description
Technical field
The present invention relates to aluminum processing technology fields, and in particular to a kind of system and technique for stewing mould liquid recycling aluminium hydroxide.
Background technology
Aluminium and aluminium alloy have many advantages, such as that processing performance is excellent, corrosion resistance is good, surface aesthetic, the rate of recovery are high, in building, hand over
The industries such as logical transport, machinery, electric power are applied widely, and it is more obvious to expand aluminium application trend for steel in recent years with aluminium.Aluminium
Processing industry is conventional industries, even more the rising industry full of vitality.According to statistics, year consumes aluminium per capita for European and American developed countries
More than 32kg, and China only has 1/3rd or so of 13kg or so, simply developed country per capita, domestic aluminium consumption is also huge
Big growth space, but the problem of under economic new normality, energy consumption is high, total amount of pollutants discharged is big, resource recycling rate is low
As the bottleneck and obstacle of industry development.
Aluminium industry production includes the processes such as electrolysis, founding, pressure processing, surface treatment, and each process can difference during production
Degree generates waste water, waste residue.Substantial amounts of aluminium ash is generated when electrolysis and founding, extrusion process, which has, stews mould alkaline waste liquor, surface treatment
Process generates all kinds of waste water and dregs containing the complicated components such as acid, alkali, treatment agent and chromium, nickel heavy metal ion.
First, Aluminum waste residue source
1st, it is electrolysed founding aluminium ash
Aluminium ash results from the electrolysis, melting and casting process of aluminium and aluminium alloy, and aluminium total losses amount is in 1- caused by aluminium ash
12%.Often process one ton of primary aluminum, about generate 20-40kg aluminium ash, yield is less during molten aluminum direct founding, during aluminium ingot remelting amount compared with
It is more, and regenerate one ton of aluminium scrap and about generate 100-250kg aluminium ash.Aluminium ash can be divided into two kinds：One kind is secondary aluminium ash, is former in electrolysis
Aluminium and casting etc. do not add the scum silica frost generated during salt flux and skimming, and main component is metallic aluminium and aluminum oxide, and aluminium contains
Amount is differed up to 15%-70%, and color is white；Another kind is Quadratic aluminum dust, is that a secondary aluminium ash carries the discarded object after alum recovery,
Aluminium content is low compared with a secondary aluminium ash, generally in grey black.Quadratic aluminum dust complicated component contains metallic aluminium (5-30%), aluminium oxide
(30-70%), silica and di-iron trioxide (5-15%), the chloride (10-30%) of potassium sodium calcium and magnesium and nitrogen fluorine arsenic etc.
Poisonous and harmful element.
National 32,500,000 tons of electrolytic aluminium yield in 2016, squeezes and calendering processing aluminum materials yield is more than 20,000,000 tons, every year
The aluminium ash quantity conservative estimation in the whole nation more has data to think aluminium ash total amount in ten thousand tons of 600-850 at 2,000,000 tons or more.Aluminium ash is one
The reproducible resource of kind, there is higher comprehensive reutilization to be worth, but not obtain enough attention always, cause huge
The wasting of resources.Simultaneously because, containing poisonous and harmful substances such as fluoride, ammonia nitrogen, arsenic, being listed in danger wastes in aluminium lime-ash,
Version in 2016《National Hazard waste register》The waste classification of middle aluminium ash is HW48, hazard property T (Toxicity)-toxicity risk
Waste.With the development of economy, aluminium scrap ash amount of savings will increase considerably year by year, if not finding economical and effective, innoxious
Method is pocessed, and will increasingly highlight its serious threat to environment.The recycling of China's aluminium ash at present is still in the starting stage,
Shortage technology maturation is reliable, the recovery method of good economy performance, and aluminium ash handles the low rate of recovery, energy consumption and waste greatly, utilizes way
Footpath is few.Even if in treated aluminium ash still containing a large amount of harmful substances still can only stockyard stockpiling or burial processing, with pole
Big environmental hazard, while producer carries huge illegal risk.Execution from 1 day January in 2018《Chinese people's republicanism
State's environmental protection tax law》Regulation, aluminium ash discharge enterprise will pay 1000 yuan/ton of environment protection tax.
2nd, compressive surface processing waste water and dregs
The production of aluminium fabricated product will consume substantial amounts of water, often produce 1 ton of aluminium and at least consume 15 tons of water, the life of whole industry year
10,000,000 tons of squeeze wood is produced, nearly 300,000,000 tons of waste discharge generates about 3,000,000 tons of waste residue after wastewater treatment, quantity is extremely surprising.
2.1st, squeeze and stew mould waste liquid waste water and dregs
Extruding die for aluminum shaped material will be put into high-concentration alkali liquor after and carry out pot mould, and the reactive aluminum in die cavity is corroded
Fall.The concentration of sodium hydroxide in mould liquid is stewed up to 250-350g/L, with the progress of reaction, aluminium composition constantly raises, when up to
To more than 60-70g/L, when reaction speed is substantially reduced, it must will just stew mould liquid and exhaust.Contain substantial amounts of aluminium in the waste liquid exhausted
Ion and sodium hydroxide, potential economic value are very big.The mode of " treatment of wastes with processes of wastes against one another " is generally taken in the processing for stewing mould waste liquid：With
The spent acid that oxidation operation generates neutralizes, and the waste residue amount that this processing mode generates is very big, and it is total with regard to that can account for enterprise to stew mould waste residue
30% or so of the quantity of slag.Not only without using its economic value, adding cost instead, waste water, waste residue are treated as enterprise
Heavy environmental burden.
2.2nd, surface treatment waste water waste residue
Aluminium is enhancing anti-corrosive properties and decoration performance, to be surface-treated.Common surface treatment mode has anodic oxygen
Change coloring, electrophoretic coating, powder spray, F-C paint spraying etc..Surface treatment process generates the waste water of a large amount of complicated components.
It is divided by process, the waste water and dregs of anodic oxidation and electrophoretic coating process have：The alkaline waste water that Alkaline etchant generates gives up
Slag accounts for the 20% of total quantity of slag；The acid waste water waste residue that oxidation solution generates, accounts for the 30% of total quantity of slag；The acidity that spraying process generates
Waste water and dregs account for the 20% of total quantity of slag.Aluminium processing enterprise waste water center aluminium slag source is subdivided into：It stews mould liquid caustic soda slag and accounts for total quantity of slag
30%, Alkaline etchant alkaline residue accounts for the 20% of total quantity of slag, and oxidation solution acid sludge accounts for the 30% of total quantity of slag, and spraying acid waste residue accounts for total quantity of slag
20%.
Containing the cations such as Al3+, Na+, NH4+, Ni2+, Sn2+, Cr6+ in waste water, SO42-, F-, NO3-, NO2-,
Organic matters such as the anion such as S2-, Cl- and organic phenol, surfactant and acrylic resin etc..Acid waste water, alkaline waste water
Usually mixing post processing, and chromate waste water, nickel-containing waste water must be handled individually.Electrophoresis material ratio is aoxidized in recent years to decline, but it is big
More than alkaline waste water, soda acid water all mixes processing, need in acidity after waste water mixing for most aluminum material factories or acid waste water
Substantial amounts of piece alkali, lime and PAC, PAM are put into, generates a large amount of waste residues.
The latest edition of August execution from 1 day in 2016《National Hazard waste register》Acid and alkaline waste water waste residue is arranged
Enter register management, waste classification is HW34, HW35 respectively.The execution from 1 day January in 2018《People's Republic of China's environment
Protect tax law》Regulation, enterprise must pay 1000 yuan/ton of wastewater treatment sludge environment-friendly tax.
The recycling rate of waterused of current aluminium processing industry water generates a large amount of waste residues less than 30% after wastewater treatment.On the one hand it is useless
The useful resources such as a large amount of metallic aluminiums, acid, alkali in slag are not utilized, and cause the huge wasting of resources.Waste residue belongs to dangerous useless
Object has great environmental hazard.Existing situation forces enterprise will be to energy-saving and emission-reduction and resource circulation utilization direction transition hair
Exhibition, but lack the technology of mature and reliable.It realizes wastewater zero discharge, zero output of waste residue, utilization of resources value maximization, has great
Environmental benefit, Social benefit and economic benefit.
2nd, Aluminum Solid state fermentation and present situation is utilized
1st, it is electrolysed the processing of founding aluminium ash and utilizes present situation
The method for developing many aluminium ash recycling and recycling in succession both at home and abroad, recycles in recent years on aluminium ash
Patent it is also in rising trend but most of in the experimental study stage, technology is confined to hot conditions extraction metallic aluminium, prepares
The inorganic material and steelmaking ingredient etc. such as aluminium oxide, aluminium chloride, aluminum sulfate, also have from industrialization, scale with a certain distance from.
1.1st, aluminium ash recycling
The method of recycling aluminium ash can be divided into heat treating process and cold-treating process at present, all simply recycle the metal in aluminium ash
Aluminium.Domestic large-scale regeneration aluminium manufacturer is mostly using rotary kiln facture of fascinating：(it is typically sodium chloride, chlorine aluminium ash and additive salt
Change the mixture of potassium and a small amount of calcirm-fluoride) be placed on heated in the rotary kiln that fascinates after separate metallic aluminium, but removal process has flue gas
It generates, metal recovery rate is relatively low, and content of residual aluminum is higher in aluminium ash, still there is further recycling space.The artificial of small workshop mode fries ash
Method is also largely using, this method is open type operation, generates a large amount of dust smog.Other methods also have squeeze absorption method, etc. from
The instant method of son, electrical concentration, MRM methods, ALUREC methods etc..
1.2nd, aluminium ash comprehensive utilization
Because aluminium ash composition and bauxite are basically identical, the product that can be produced with bauxite, all someone are carried out with aluminium ash
Overtesting is studied.Mainly there are three routes in terms of the recycling of current aluminium ash：(1) recycling aluminium oxide returns electrolysis, recycles chlorine
Salt is used as founding refining agent, but the main component in aluminium ash is α-Al2O3, and poor activity, more multipotency need to be consumed by being ionized
Amount, causes tank voltage to raise.(2) acid system or alkaline process processing removal of impurities, production synthesis Brown Alundum, Sialon ceramics and refractory material etc.
Inorganic material produces the water-purifying materials such as aluminium polychloride and aluminum sulfate, produces steel-making slag making desulfurizing agent, but because cost is than existing
Also height, fail realize industrialized production.(3) building materials or road-making material are produced, such as aluminate cement, calcium aluminate powder, clear water brick,
And road-making material etc., but the fluoride, the villaumite that contain have an impact performance, while added value of product is low, limits actual answer
With.There are the shortcomings of product purity is low, added value is low, discarded object secondary pollution for application in terms of three above.Aluminium ash recycling
Discarded object after utilization can only be filled or stored up still containing great amount of soluble salt and fluoride or dangerous waste, environmental hazard
There is no reductions.
Due to containing high temperature resistants, corrosion resistance, the toxics such as a certain amount of villaumite (NaCl, KCl etc.) and fluoride in aluminium ash
Etc. components, conventional method be difficult to realize the recycling of full ingredient, add the cost and technical difficulty of aluminium ash recycling so that
The Industrialization Progress of aluminium ash processing is slow.In addition, the Transport And Transformation for harmful elements such as aluminium ash processing procedure fluorine and heavy metals
Mechanism lacks more deep discussion.
In the case of resource scarcity, environmental pollution getting worse, the development of aluminium processing industry faces the huge of resource and environment
Pressure, energy-saving and emission-reduction, resource circulation utilization are following developing direction and the only way.Accomplish aluminium ash resource " zero is useless
Abandon ", it is necessary to change utilization of resources thinking, make full use of the various composition in aluminium ash, carry out harmless treatment, resource maximizationization
It utilizes.This work is very urgent, it is necessary to which specific direction, standard guidance, multiparty collaboration, strive obtaining real-time breakthrough early.
2nd, compressive surface processing waste water and dregs handle and utilize present situation
1. waste water and dregs are recycled, comprehensive utilization includes two aspect contents：First, the recycling of water；Second is that waste residue
Comprehensive utilization of resources.
1.1st, squeeze and stew mould liquid and oxidation pre-treatment Alkaline etchant recycling
It squeezes pot mould liquid and contains substantial amounts of sodium hydroxide and aluminium ion, there is many research reports in terms of stewing the recycling of mould liquid
And patent, such as the Crystalfix chemical recovery systems of Italy, but because flow is complicated, comprehensive benefit is not high, practical application
Seldom.Aluminium processing enterprise processing stew mould waste liquid common practice be：Stew the spent acid neutralization precipitation that mould waste water is generated with oxidation operation
Post processing slag processed only stews the waste residue that mould liquid generates and just accounts for 30% or so of the total quantity of slag of enterprise.Enterprise does not recycle not only
Stew the useful resources such as sodium hydroxide, aluminium ion in mould liquid, add cost instead, waste water, waste residue be treated as it is heavy
Environmental burden.
The recycling of oxidation pre-treatment Alkaline etchant recycles sodium hydroxide generally using crystallization, but sodium hydroxide granularity it is relatively thin,
Purity is not high, economic value is low.In addition, aluminium ion is maintained at low concentration (being less than 30g/L) by crystallization, it is thick to easily cause section bar
The defects of crystalline substance, coarse sand, excessive erosion, and aluminium consumption is too high.Crystallization is higher to operation and technological requirement, and management is bad will to precipitate knot
Dirt, can only stop production manual cleaning at this time, take time and effort.There is a small amount of producer to come into operation online soda recovery unit, because of recovering effect not
It is good, of high cost, it has given it up mostly.Add corrosion inhibiter, the alkaline etching tank liquor of complexing agent does not apply to soda recovery unit, also limit
The application of the technology.
1.2nd, oxidation solution aluminium ion and retrieval of sulfuric acid
Aluminium ion in aluminium alloy anode oxide liquid directly affects the electric conductivity and film quality of tank liquor, Optimal Control
Concentration should be between 3-10g/L scopes.Aluminium ion constantly accumulates rise with the increase of output, and film quality is deteriorated, power consumption
Rise, but in view of reagent cost and environmental protection pressure, aluminium ion concentration general control is in 15-20g/L areas in enterprise practical production
Between.After reaching the upper limit, it is necessary to reduce aluminium composition.It is to exhaust half tank liquor to reduce aluminum ions usual way, supplements sulfuric acid
After continue to produce.This method is simple, but has the following disadvantages：First, having lost sulfuric acid, aluminium ion is wasted, sulfuric acid consumption reaches
More than 60kg/t；Second is that processing spent acid adds sizable cost；Third, flood tide waste residue causes environmental hazard.
Retrieval of sulfuric acid machine using diffusion dialysis principle was once the aluminum ions means of control being widely used.Retrieval of sulfuric acid
Machine is aluminum ions stabilising arrangement, reaches recycling sulfuric acid using diffusion dialysis amberplex, removes aluminum ions purpose.In reality
In the operation of border, there are recovering effect is poor, high energy consumption, efficiency is low, the quantity of slag is not reduced the deficiencies of.In view of the above-mentioned grain of retrieval of sulfuric acid machine
The using effect of cake, most of aluminium processing enterprise progressively disable the device, have recovered the tradition side of the oxidation of falling half tank liquor
Method.
1.3rd, pretreated waste water recycling is sprayed
The market share of powder spray alloy product substantially increases in recent years, has accounted for aluminum alloy surface processing product
More than 60%.The purpose of sprayed surface pretreatment is to generate one layer of fine and close conversion film in aluminium material surface, by base material and sprayed coating
Firm connection is together.To ensure the quality of conversion film, process control needs are very strict, and exceeded tank liquor and washings are necessary
It exhausts.Waste water contains substantial amounts of Cr VI, fluotitanic acid, fluorine zirconic acid root and fluorine ion in acidity.Substantial amounts of spent acid processing both increased
Entreprise cost, and resource is wasted, also with environmental hazard.Spraying pretreatment and wastewater processing technology are in progress without apparent,
It still uses conventional methods, neutralizes, precipitates, a large amount of waste residues are formed after filter-press dehydration.Waste residue belongs to the hazardous waste of stringent management and control,
Qualified third party must be transferred to and carry out the harmless processing that standardizes.
1.4th, containing chromium and nickel-containing waste water
Chromium, nickel belong to a class of pollutant, and processing, chromium slag (HW21) and nickel slag must be individually separated containing chromium or nickel-containing waste water
(HW17) hazardous waste is belonged to.
The recycling of hexavalent chromium is still a problem, can not now realize online recycling medicament containing chromium.Chromate waste water is present
Processing method be：The reducing agents such as sodium pyrosulfite or sodium hydrogensulfite are added in, by hexavalent chrome reduction into the lower trivalent of toxicity
Chromium, then adds alkali, PAM carries out reaction precipitation, and chromium slag is obtained after dewatering and filtering mud.
Nickel ion, which recycles, is only limitted to coloring slot, and the nickel ion in sealing of hole waste water is directly discharged because content is low.Nickel ion returns
It receives using RO retracting devices, principle is identical with acid recovery, and part of the manufacturer is using, but efficiency is low and generates a large amount of condensed waters,
Effect is equally preferable not to the utmost.The processing of nickel-containing waste water uses the precipitation method, adds in sodium hydroxide and PAM, adjusts pH, reaction generation hydrogen
Nickel oxide precipitates, and nickel slag is obtained after dewatering and filtering mud.
1.5th, compressive surface processing waste water and dregs integrated treatment
Many aluminium section bar producers have carried out various aspects in terms of water-saving and waste water treatment and have tried to explore and effective practice, obtain
Certain effect.Aluminum current processing industry waste water is still generally adjusted using neutralization and coagulant sedimentation processing, process flow are：
Acidic and alkaline waste water neutralizes mutually, adjusts pH to the formation hydroxide precipitation such as neutrality, cation A l3+.The waste water of neutralized precipitation is beaten
Enter in coagulation tank, add in flocculant PAC, PAM, into precipitation tank, standard emission of clear or reuse after flocculation, water-containing sludge is through pressure
Aluminiferous waste slag is formed after filter press filtration.Waste residue moisture content 80% or so, quantity is very big.
Conventional waste water Solid state fermentation mode has following deficiency：When after wastewater treatment can qualified discharge, but Treated sewage reusing rate
It is low；Second is that cost for wastewater treatment is high, increase artificial, medicament, power consumption；Third, substantial amounts of soda acid, metallic aluminium, chemical agent etc.
Useful resources are wasted；Fourth, waste residue belongs to dangerous waste, disposal costs are high, need to pay environmentally friendly tax.
2nd, compressive surface processing waste water and dregs comprehensive utilization
Comprehensive utilization includes two aspect contents：First, the recycling of water；Second is that the comprehensive utilization of resources to waste residue.Recycling
Very undesirable using present situation, preceding to have addressed, the recycling rate of waterused of water is less than 30%, way that aluminium slag, chromium slag, nickel slag for comprehensive utilize
Footpath and method are limited.
2.1st, the comprehensive utilization of aluminium slag
Carry out for many years, there is considerable article and patented technology, recycling profit to the utilization of resources research of Aluminiferous waste slag
Technology Ways and aluminium ash are essentially identical, mainly there is following several respects：(1) aluminium hydroxide or aluminium oxide are directly recycled；(2) close
Into the ceramics such as mullite, cordierite, preparing ceramic clinker, artificial resin marble or refractory material；(3) water-purifying material, such as aluminium are produced
Sour calcium, aluminium polychloride (iron), polyaluminium sulfate etc.；(4) chemical products such as ice crystal, ammonia-alum are produced in reaction, and such as China is special
Sharp CN 1350065A disclose it is a kind of using alkaline residue extracting sulfuric acid aluminium ammonium, aluminum sulfate, aluminium hydroxide method, Chinese patent CN
101186282B, which discloses a kind of hardening oxidation sulfuric acid tank liquor, reduces aluminium ion and the method for producing ammonium alum, Chinese patent CN
1319302C discloses a kind of method using fluorine-containing acid sludge preparing ice spar, this patented technology Shuo Jia producers are actual should
With achieving fabulous economic benefit, while solve the processing problem of acid sludge.
Except the technology that ice crystal is produced using acid sludge is succeeded in addition to, other major part methods do not have scale application
With the comprehensive utilization ratio of aluminium slag is very low, and main cause or technology are immature, added value of product is low, cost is higher.The overwhelming majority
Waste residue is all that aluminum material factory's payment process of spending is fallen, and pile up like a mountain for the waste residue of many aluminum material factories now, into one of aluminum material factory
Scald one's hand Chinese yam.
2.2nd, chromium slag and nickel slag for comprehensive utilize
According to open source information, chromium slag can be used as glass colorant and crystallization promoter, but practical situations are unknown.It has no
There is the open source information of nickel slag recycling.Chromium slag, nickel slag common practice are to go to the third-party institution to carry out at innoxious burial
Reason.
3rd, there are problems for the processing of compressive surface processing waste water and dregs
First, water consume is high, lack ripe water-saving technology, the reclamation rate of water is low；Second is that online classification waste water fails before becoming
Program is put, causes waste residue yield big；Third, the comprehensive utilization effect of waste residue is little, Solid state fermentation becomes business burden and environmental protection
Risk.
Currently, Solid state fermentation there are problems that three aspect conspicuous contradictions and：First, country carries out enterprise pollution object discharge permit
Card management controls the gross contamination emission of enterprise, and the actual waste water waste residue amount of enterprise is much larger than allowable emission；It is second is that useless
Slag must legal transfer disposed to qualified third party, but disposing capacity is substantially inadequate, can not the such flood tide of legal processes
Waste residue；Third, by dangerous waste specification handles waste residue, flow is complicated, efficiency is low, of high cost.
In conclusion aluminium processing industry waste water and dregs processing domestic at present is particularly thorny, integrated treatment difficulty is larger, cost
Height, recovery utilization rate are low, have not only caused a large amount of wastes of resource, but also have seriously polluted environment.Therefore for aluminium processing industry, waste water zero
Discharge and the research and development of resource comprehensive utilization technology have bright prospects and huge environmental benefit, society to imitate with popularization and application
Benefit and economic benefit.
3rd, Aluminum aluminium ash and aluminium slag minimizing recycling direction
1st, the principle followed：Minimizing control, harmless treatment, recycling, it is necessary to government driving, enterprise dominate,
Third party's marketization configuration resource, the unification of three power could obtain positive progress；
2nd, source controls, and classifies to each pharmacy slot and retains, online to convert, and recycling reduces waste water and dregs discharge capacity；
3rd, environmentally friendly process for treating surface is promoted and applied.For the pollution problem of oxidation line, promote and apply nothing and add
Add agent alkaline etching, without techniques such as nickel free-floride sealing of holes；
4th, strengthen Enterprises Universities Researches Union, expand thinking and the field of waste residue comprehensive utilization, realize that comprehensive utilization value maximizes.
The content of the invention
It is an object of the invention to be directed to shortcoming of the prior art, a kind of recycling aluminium hydroxide is provided and is not easy to tie
The system and technique that stew mould liquid recycling aluminium hydroxide of dirt.
For this purpose, the present invention uses following technical scheme：
A kind of system for stewing mould liquid recycling aluminium hydroxide, including stewing mould liquid collection system, stewing mould liquid treating system, pot mould liquid
Piece-rate system and pot mould liquid react recovery system again with water；
Pot mould liquid collection system includes stewing mould liquid recycling can and No.1 pump；Pot mould liquid collection system is used to collect
Stew mould liquid；
Pot mould liquid treating system includes retort, No. two pumps and aluminium hydroxide crystal seed holding vessel；At pot mould liquid
Reason system is used to carry out the chemical reaction for stewing mould liquid and produces aluminium hydroxide；
Pot mould liquid separation system includes recycling can and centrifuge；The mould liquid separation system that stews is used for what will be produced
Aluminium hydroxide separation of solid and liquid；
Pot mould liquid reacts recovery system with water again includes Sewage treatment tank and No. three pumps；Pot mould liquid is anti-again with water
Recovery system is answered for the waste water after separation of solid and liquid to be recycled；
No. two pot mould liquid recycling can, No.1 pump, retort pumps are sequentially connected with recycling can by pipeline；The reaction
Tank includes No.1 retort and No. two retort；No.1 pump is respectively by being equipped with the pipeline of No.1 valve and equipped with No. two valves
Pipeline is connected with the No.1 retort and No. two retort；The outlet of No. two pumps passes through another pipeline and described one
Number retort be connected at the top of No. two retort；It is connected by the outlet of the recycling can with the centrifuge；Pot mould
20 No. two valves are equipped between liquid recycling can and No.1 pump；The No.1 retort and No. two retort and described No. two pumps
Between be equipped with No. nine valves；The inlet of the recycling can is equipped with ten No. six valves；It is equipped between the recycling can and the centrifuge
Ten No. seven valves；The aluminium hydroxide crystal seed holding vessel is connected by being equipped with the pipeline of No. ten valves with No. two pumps.
The entrance of the Sewage treatment tank is connected by pipeline with the centrifuge；The bottom of the Sewage treatment tank leads to
The pipeline equipped with ten No. nine valves is crossed with No. three pumps to be connected；The middle part of the Sewage treatment tank is by being equipped with ten No. eight valves
Pipeline is connected with No. three pumps；No. three pumps pass through the pipeline for being equipped with two ride on Bus No. 11 valves and the No.1 retort phase
Connection；The pipeline that No. three pumps are equipped with two No. ten valves by another is connected with stewing die cavity；The No.1 retort and
No. two reaction pot bottoms are connected by pipeline with No. two pumps；The bottom of the No.1 retort is equipped with No. seven valves；It is described
The bottom of No. two retort is equipped with No. eight valves；No. nine valves are provided close at No. two pumps；The No.1 retort difference
It is connected by being equipped with No. three valves and pipeline equipped with No. five valves with No. two pumps；No. two retort are respectively by being equipped with
The pipeline of No. four valves and the pipeline equipped with No. six valves are connected with No. two pumps；No. two pumps pass through pipeline and the waste water
Recycling can is connected, and ten No. two valves are being equipped at No. two pumps, and 15 are being equipped at the Sewage treatment tank
Number valve；No. two pumps are connected by another pipeline with the No.1 retort and No. two retort respectively, and close
Ride on Bus No. 11 valve is equipped at No. two pumps, ten No. three valves are being equipped at the No.1 retort, anti-close to described No. two
It answers and ten No. four valves is equipped at tank.
Further description, a kind of system of pot mould liquid production aluminium hydroxide according to claim, feature
It is：Being equipped with above the No.1 retort and No. two retort prevents from stewing the overflow pipe that mould hydrorrhea goes out；The overflow pipe
It is connected with the Sewage treatment tank.
Further description is equipped in the No.1 retort, No. two retort, recycling can and Sewage treatment tank and stirs
Mix device.
The technique for stewing mould liquid recycling aluminium hydroxide, includes the following steps：
Step 1：Open 20 No. two valves, No.1 valve, No. two valves, close No. three valves, No. four valves, No. five valves,
No. six valves, No. seven valves, No. eight valves open the No.1 pump, and pending pot mould liquid pump is entered the No.1 retort and No. two anti-
It answers in tank, completes to stew the operation of mould liquid collection system；
Step 2：Close No. three valves, No. four valves, No. five valves, No. six valves, No. eight valves, No. ten valves, ten No. two valves, ten
No. four valves；No. seven valve valves, No. nine valves, ride on Bus No. 11 valve, ten No. three valves are opened, open No. two pumps, cycle pending pot mould liquid；
Under conditions of No. two pumps keep the pending pot mould liquid of systemic circulation, No. ten valves are opened, negative pressure are utilized to suck aluminium hydroxide crystal seed
The No.1 retort is reacted；Valve switch is adjusted, aluminium hydroxide crystal seed is sucked into institute using negative pressure in the same way
No. two retort are stated to be reacted；
Step 3：No. three valves or No. five valves are opened, open No. nine valves, ten No. two valves, ten No. five valves, it will be in No.1 retort
Supernatant be put into the Sewage treatment tank；Close ride on Bus No. 11 valve, ten No. five valves, ten No. seven valves；Open No. seven valves, ten No. six
Valve；No. two pumps are opened, the solidliquid mixture in the No.1 retort is pumped into the recycling can；Open ionization scheming；It opens
Ten No. seven valves, separation of solid and liquid aluminium hydroxide, and recovered liquid is delivered to Sewage treatment tank；Valve switch is adjusted, with same side
Formula separates the aluminium hydroxide and liquid in No. two retort；
Step 4：Ten No. five valves, ten No. eight valves, ten No. nine valves are closed, by Sewage treatment into the Sewage treatment tank；It closes
Ten No. five valves, ten No. nine valves, two ride on Bus No. 11 valves are closed, open ten No. eight valves, two No. ten valves, No. three pumps is opened, supernatant is sent back to
Stew die cavity；Close ten No. eight valves, two No. ten valves；Open ten No. nine valves, two ride on Bus No. 11 valves；No. three pumps are opened, by aluminium hydroxide
Solidliquid mixture sends No.1 retort circulation and stress back to；
Step 5：Pot mould liquid of 90-100 °, R ＞ 4.0 is put into pot mould liquid recycling can, order stews mould liquid and passes through successively
Pot mould liquid collection system is crossed, mould liquid treating system is stewed, stew mould liquid separation system and stews mould liquid and react recovery system again with water,
The aluminium dirt in each system is dissolved, completes the scale removal of the system to stewing mould liquid recycling aluminium hydroxide.
Further description adds aluminium hydroxide crystal seed in step 2, when aluminium ion concentration is reduced in reaction solution
During below 30g/L, stop addition aluminium hydroxide crystal seed.
Further description, the free alkali concentration of pot mould liquid recycled in the step 1 and aluminum ions concentration ratio
Value is between 3.00-3.50.
Further description, in 90-100 ° of pot mould liquid added in the step 5 free alkali concentration and aluminium from
The concentration proportion of son is more than 4.00.
Further description, stop addition crystal seed after, stand still for crystals no less than 2 it is small when after, recycle aluminium hydroxide.
Further description is equipped in the No.1 retort, No. two retort, recycling can and Sewage treatment tank and stirs
Device is mixed, is stirred when adding aluminium hydroxide crystal seed and carrying out separation of solid and liquid.
Further description also continues to stirring no less than 60 minutes after stopping addition aluminium hydroxide crystal seed.
Beneficial effects of the present invention：
Aluminium ion, is converted into industrial aluminium hydroxide, turned waste into wealth by the 1st, aluminium ion fully in recycling pot mould waste liquid,
Realize the high value recycling of aluminium scrap；
2nd, the present invention for the first time controls the free alkali concentration for stewing mould liquid and aluminum ions concentration proportion between 3.00-3.50
When, mould liquid decomposed is stewed, aluminium hydroxide, the seldom fouling of wall is precipitated；
3rd, the present invention (stews the free alkali concentration of mould liquid and aluminum ions concentration proportion using hot pot mould liquid for the first time>4.00、
90-100 DEG C), the aluminium dirt of equipment wall is completely dissolved, the trouble of manual cleaning is saved, utilizes the life of chemical method restorer
Production capacity power；
4th, using the mode of negative pressure by aluminium hydroxide crystal seed sucting reaction tank, realization low level addition aluminium hydroxide crystal seed is kept away
Exempt from above retort high-order addition, both prevent aluminium hydroxide crystal seed from the risk for stewing the addition of mould liquid upper surface, dangerous operation,
Labor intensity is reduced again.
Description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the overall structure diagram of one embodiment of the present of invention；
Wherein：It stews mould liquid recycling can 1, retort 2,21, No. two retort 22 of No.1 retort, hydrofluoric acid fluid reservoir 3, return
Closed cans 4, centrifuge 5, Sewage treatment tank 6, No.1 pump 01, No. two pump 02, No. three pump 03, blender 04, overflow pipe 05, No.1 valve
0001st, No. two valves of valve 0007, eight of valve 0006, seven of valve 0005, six of valve 0004, five of valve 0003, four of valve 0002, three
0008th, 0009, No. ten valve 0010 of No. nine valves, 0013, ten No. four valve of valve of valve 0012,13 of ride on Bus No. 11 valve 0011,12
0014th, ten No. five valves 0019,20 of valve 0018,19 of valve 0017,18 of valve 0016,17 of valve 0015,16
Valve 0020, two ride on Bus No. 11 valves 0021 and 20 No. two valves 0022.
Specific embodiment
Technical solution to further illustrate the present invention below with reference to the accompanying drawings and specific embodiments.
Stew the theoretical foundation of mould devil liquor recovery aluminium ion production aluminium hydroxide：
When stewing mould, chemical reaction as follows occurs in Alkaline etchant for the aluminium material head in grinding tool：
Al2O3+ 2NaOH=2NaAlO2+H2O (removing natural oxide film) (1)
2Al+2NaOH+2H2O=2NaAlO2+3H2↑ (molten aluminium) (2)
NaAlO2+2H2O=Al (OH)3↓+NaOH (tank liquor decomposes, and regenerates lye) (3)
2Al(OH)3=Al2O3.3H2O (cell wall fouling blocks pipeline) (4)
By (1) (2) two formula, alkali concn is higher, and molten aluminium speed is faster；By (3) (4) two formula, pot mould liquid is unstable, easily divides
Solution, and fouling.By (3) formula, in order to recycle aluminium hydroxide, naoh concentration can be suitably reduced, sodium metaaluminate resolves into hydrogen-oxygen
Change aluminium and sodium hydroxide, can separation of solid and liquid aluminium hydroxide, reuse sodium hydroxide.By (4) formula, aluminium hydroxide is unstable, easily decomposes
Into Al2O3.3H2O forms aluminium dirt, is adhered to the place of all tank liquors contact such as cell wall, pipeline, valve, pump, blender, tank skin,
It safeguards very troublesome.Reclaimer fouling is, it is necessary to properly increase naoh concentration in order to prevent, makes reaction equation (3) can be after
Continuous, reaction equation (4) is difficult to.
Stew the experimental result of mould devil liquor recovery aluminium ion production aluminium hydroxide：
It stews mould liquid to slot by sodium hydroxide 100g/L, starts to stew mould, tank liquor is brought rapidly up reaching boiling point, aluminium ion and dissociates
Alkali concn rises.It stews in mold process at interval of 20 minutes, a mould liquid that stews respectively is taken to store a week, is then observed outside tank liquor
The indexs such as sight, precipitation and fouling are as a result as follows：
Sample 1：Take free alkali 110g/L, Al3+The waste liquid of 20g/L, R=free alkali concentrations/Al3+Concentration=5.50, tank liquor
It does not decompose, no aluminium hydroxide is precipitated；
Sample 2：Take free alkali 121g/L, Al3+The waste liquid of 34g/L, R=free alkali concentrations/Al3+Concentration=4.0, tank liquor
It does not decompose, no aluminium hydroxide is precipitated；
Sample 3：Take free alkali 121g/L, Al3+The waste liquid of 34g/L, R=free alkali concentrations/Al3+Concentration=3.56, tank liquor
It does not decompose, no aluminium hydroxide is precipitated；
Sample 4：Take free alkali 125g/L, Al3+The waste liquid of 38.5g/L, R=free alkali concentrations/Al3+Concentration=3.50, slot
Liquid decomposes, and has micro aluminium hydroxide to be precipitated, chamber wall is without dirt；
Sample 5：Take free alkali 125g/L, Al3+The waste liquid of 38.5g/L, R=free alkali concentrations/Al3+Concentration=3.25, slot
Liquid decomposes, and has a small amount of aluminium hydroxide to be precipitated, chamber wall is without dirt；Alumina seed is hydrogenated with, is stirred evenly, when standing 2 is small, hydroxide
Aluminium substantially increases；It refilters, rinse crystal, when drying 2 is small at 110 ± 5 DEG C, obtain aluminium hydroxide sample, then censorship.Reference
Aluminium hydroxide national standard (table 0), sample commission Chinese Academy of Sciences Guangzhou chemistry detect test center's test, and the results are shown in Table 1, gained
Aluminum hydroxide product complies fully with national standard；
Sample 6：Take free alkali 128g/L, Al3+The waste liquid of 42.7g/L, R=free alkali concentrations/Al3+Concentration=3.00, slot
Liquid decomposes, and aluminium hydroxide, which is precipitated, to be increased, and chamber wall is without dirt；
Sample 7：Take free alkali 131g/L, Al3+The waste liquid of 47.6g/L, R=free alkali concentrations/Al3+Concentration=2.95, slot
Liquid decomposes, and aluminium hydroxide, which is precipitated, to be increased, and chamber wall omits fouling；After recycling aluminium hydroxide sample, the R=that adjustment stews mould waste liquid dissociates
Alkali concn/Al3+Concentration>4.00, and temperature is after 90-100 DEG C, 30 minutes, aluminium dirt is completely dissolved, and wall is clean.
Sample 8：Take free alkali 134g/L, Al3+The waste liquid of 53.6g/L, R=free alkali concentrations/Al3+Concentration=2.50, slot
Liquid decomposes, and aluminium hydroxide, which is precipitated, to be increased, and chamber wall fouling increases；
Sample 9：Take free alkali 143g/L, Al3+The waste liquid of 71.5g/L, R=free alkali concentrations/Al3+Concentration=2.00, slot
Liquid decomposes, and aluminium hydroxide, which is precipitated, to be increased, and chamber wall fouling increases.
0 aluminium hydroxide national standard of table
The aluminium hydroxide sample detection result of 1 embodiment 5 of table
As shown in Figure 1,
A kind of system for stewing mould liquid recycling aluminium hydroxide, including stewing mould liquid collection system, stewing mould liquid treating system, pot mould liquid
Piece-rate system and pot mould liquid react recovery system again with water；
Pot mould liquid collection system includes stewing mould liquid recycling can 1 and No.1 pump 01；Pot mould liquid collection system is used for
It collects and stews mould liquid；
Pot mould liquid treating system includes 2, No. two pumps 02 of retort and aluminium hydroxide crystal seed holding vessel 3；Pot mould
Liquid treating system is used to carry out the chemical reaction for stewing mould liquid and produces aluminium hydroxide；
Pot mould liquid separation system includes recycling can 4 and centrifuge 5；Pot mould liquid separation system is used to produce
Aluminium hydroxide separation of solid and liquid；
Pot mould liquid reacts recovery system with water again includes Sewage treatment tank 6 and No. three pumps 03；Pot mould liquid water
Recovery system is reacted again for the waste water after separation of solid and liquid to be recycled；
2 No. two pot mould liquid recycling can 1, No.1 pump 01, retort pumps 02 are sequentially connected with recycling can 3 by pipeline；
The retort 2 includes No.1 retort 21 and No. two retort 22；The No.1 pump 01 is respectively by being equipped with No.1 valve 0001
Pipeline and pipeline equipped with No. two valves 0002 be connected with the No.1 retort 21 and No. two retort 22；No. two pumps
02 outlet is connected by another pipeline with the No.1 retort 21 and No. two 22 tops of retort；Pass through the recycling
The outlet of tank 3 is connected with the centrifuge 4；20 No. two valves are equipped between pot mould liquid recycling can 1 and No.1 pump 01
0022；No. nine valves 009 are equipped between the No.1 retort 21 and No. two retort 22 and No. two pumps 02；The recycling can
4 inlet is equipped with ten No. six valves 0016；Ten No. seven valves 0017 are equipped between the recycling can 4 and the centrifuge 5；The hydrogen
Alumina seed holding vessel 3 is connected by being equipped with the pipeline of No. ten valves 0010 with described No. two pumps 02.
The entrance of the Sewage treatment tank 6 is connected by pipeline with the centrifuge 5；The bottom of the Sewage treatment tank 6
Portion is connected by being equipped with the pipeline of ten No. nine valves 0019 with described No. three pumps 03；The middle part of the Sewage treatment tank 6 is by setting
The pipeline for having ten No. eight valves 0018 is connected with described No. three pumps 03；No. three pumps 03 are by being equipped with two ride on Bus No. 11 valves 0021
Pipeline be connected with the No.1 retort 21；The pipeline that No. three pumps 03 are equipped with two No. ten valves 0020 by another
It is connected with stewing die cavity；The No.1 retort 21 and No. two 22 bottoms of retort are connected by pipeline with described No. two pumps 02
It is logical；The bottom of the No.1 retort 21 is equipped with No. seven valves 0007；The bottom of No. two retort 22 is equipped with No. eight valves 0008；
No. nine valves 0009 are provided close at No. two pumps 02；The No.1 retort 21 is respectively by being equipped with No. three 0003 Hes of valve
Pipeline equipped with No. five valves 0005 is connected with described No. two pumps 02；No. two retort 22 are respectively by being equipped with No. four valves
0004 pipeline and pipeline equipped with No. six valves 0006 are connected with described No. two pumps 02；No. two pumps 02 pass through pipeline and institute
It states Sewage treatment tank 6 to be connected, and ten No. two valves 0012 is being equipped at described No. two pumps 02, close to the Sewage treatment
Ten No. five valves 0015 are equipped at tank 6；It is described No. two pump 02 by another pipeline respectively with the No.1 retort 21 and No. two
Retort 22 is connected, and is being equipped with ride on Bus No. 11 valve 0011 at described No. two pumps 02, close to the No.1 retort 21
Place is equipped with ten No. three valves 0013, and ten No. four valves 0014 are being equipped at No. two retort 22.
It stews mould liquid to return in retort 2 via No. two pumps 02 by pipeline from retort 2, forms a systemic circulation,
No. ten valves 0010 are opened while systemic circulation carries out, the aluminium hydroxide crystal seed in aluminium hydroxide crystal seed holding vessel 3 will be by negative
Pressure is transported in the systemic circulation for stewing mould liquid, participates in the reaction with stewing mould liquid, under systemic circulation liquid ceaselessly flows, aluminium hydroxide
Crystal seed can more mix more uniform with pot mould liquid, and reaction is faster.Aluminium hydroxide crystal seed is pumped at No. two at 02 and alkali
Property stew mould liquid be sufficiently mixed, react, it is non-volatile, generate aluminium hydroxide；This adding method realizes low level addition aluminium hydroxide crystal seed,
The high-order addition above retort 2 is avoided, had both prevented aluminium hydroxide crystal seed and has seriously been waved under the addition of pot mould liquid upper surface, high temperature
It sends out, endangers workers ' health, pollutes the risk of environment, and reduce labor intensity.From 5 solid-liquid separation aluminium hydroxide of centrifuge
Afterwards, remaining substantial amounts of free fluorine in remaining waste water, using the fluorine in the alum recovery Sewage treatment tank 6 stewed in mould liquid, will react
Supernatant afterwards sends pot die cavity back to, realizes waste water recycling；Send remaining solidliquid mixture back to No.1 retort 21, circulation and stress trip
From fluorine；Waste water all repeats reuse, realizes and stews mould liquid waste water and dregs zero-emission.
The top of further description, the No.1 retort 21 and No. two retort 22, which is equipped with, to prevent from stewing mould hydrorrhea
The overflow pipe 05 gone out；The overflow pipe 05 is connected with the Sewage treatment tank 6.
Overflow pipe 05 is the safeguard procedures of security, prevents liquid from excessively overflowing retort 2.If reaction solution is more than overflow
The height that pipe 05 is set, will flow to Sewage treatment tank 6 from overflow pipe 05, re-start the recycling process of waste water.
Further description, in described No.1 retort 21, No. two retort 22, recycling can 4 and Sewage treatment tanks 6
Equipped with blender 04.
21, No. two retort 22 of No.1 retort and with the chemical reaction there are liquid in Sewage treatment tank 6, fully stir
Mixing can make various reagents mixing more uniform, accelerate the speed of reaction, make reaction more abundant.In recycling can 4, first carry out
Sufficiently stirring makes aluminium hydroxide be uniformly dispersed in reaction solution, and it is better that centrifuge 5 carries out effect during separation of solid and liquid.
The technique for stewing mould liquid recycling aluminium hydroxide, includes the following steps：
Step 1：0001, No. two 20 No. two valves 0022, No.1 valve valve 0002 are opened, closes No. three valves
0003rd, No. four valves 0008 of valve 0007, eight of valve 0006, seven of valve 0005, six of valve 0004, five open the No.1 pump 01,
Pending pot mould liquid pump is entered in the No.1 retort 21 and No. two retort 22, completes to stew the operation of mould liquid collection system；
Step 2：Close the valve 0004, five of No. three valves 0003, four valve 0005, six valve of valve 0006, eight
0008th, No. ten valves 0014 of valve 0012,14 of valve 0010,12；Open described 0007, No. nine valve 0009, ten of No. seven valve valves
0011, ten No. three valve 0013 of No.1 valve opens No. two pumps 02, cycles pending pot mould liquid；It waits to locate in No. two 2 holding systemic circulations of pump
Under conditions of reason stews mould liquid, open No. ten valves 0010, by aluminium hydroxide crystal seed using negative pressure suck the No.1 retort 21 into
Row reaction；Adjust valve switch, in the same way by aluminium hydroxide crystal seed using negative pressure suck No. two retort 22 into
Row reaction；
Step 3：No. three valves 0003 or No. five valves 0005 are opened, open No. nine valves 0012,15 of valve 0009,12
Supernatant in No.1 retort 21 is put into the Sewage treatment tank 6 by valve 0015；Close ride on Bus No. 11 0011, ten No. five valve of valve
0015th, ten No. seven valves 0017；Open 0007, ten No. six valve 0016 of No. seven valves；No. two pumps 02 are opened, by the No.1 retort 21
In solidliquid mixture be pumped into the recycling can 4；Open ionization scheming 5；Open ten No. seven valves 0017, separation of solid and liquid hydroxide
Aluminium, and recovered liquid is delivered to Sewage treatment tank 6；Valve switch is adjusted, separates No. two retort 22 in the same way
In aluminium hydroxide and liquid；
Step 4：Ten No. five valves 0019 of valve 0018,19 of valve 0015,18 are closed, Sewage treatment is given up to described
In water recovery tank 6；Ten No. five valves, 0015, ten No. nine valve 0019, two ride on Bus No. 11 valves 0021 are closed, open ten No. eight valves 0018, two
No. ten valves 0020 open No. three pumps 03, send supernatant back to pot die cavity；Close ten No. eight valves, 0018, two No. ten valve 0020；It opens
Ten No. nine valves 0019, two ride on Bus No. 11 valves 0021；No. three pumps 03 are opened, send the solidliquid mixture of aluminium hydroxide back to No.1 retort
21 circulation and stress；
Step 5：90-100 ° of pot mould liquid is put into pot mould liquid recycling can 1, order stews mould liquid successively by described
Mould liquid collection system is stewed, mould liquid treating system is stewed, stew mould liquid separation system and stews mould liquid and react recovery system again with water, dissolving is each
Aluminium dirt in system completes the scale removal of the system to stewing mould liquid recycling aluminium hydroxide.
Further description adds aluminium hydroxide crystal seed in step 2, when aluminium ion concentration is reduced in reaction solution
During below 30g/L, stop addition aluminium hydroxide crystal seed.
Reactant concentration decline can reduce reaction speed in chemical reaction.When the aluminium ion concentration in reaction solution is reduced to
During below 30g/L, the aluminium ion concentration in reaction solution is very low, continues to add aluminium hydroxide crystal seed reaction rate and reaction is imitated
Rate may proceed to be lower, and no longer add aluminium hydroxide crystal seed at this time for guarantee production efficiency.
Further description, the free alkali concentration of pot mould liquid recycled in the step 1 and aluminum ions concentration ratio
Value is between 3.00-3.50.
By a large amount of accurately it is demonstrated experimentally that free alkali concentration and aluminum ions concentration proportion are in 3.00- in pot mould liquid
Mould liquid decomposed is stewed when between 3.50, aluminium hydroxide is precipitated, recyclable hydrogen after aluminium hydroxide crystal seed is added in the seldom fouling of wall
Aluminium oxide by rinsing, can must meet the aluminum hydroxide product of national standard, can recycle and meet national standard after press filtration, drying
Aluminium hydroxide, and reclaimer fouling risk can be reduced, significantly extend turn(a)round.
Further description, in 90-100 ° of pot mould liquid added in the step 5 free alkali concentration and aluminium from
The concentration proportion of son is more than 4.00.
Pot mould liquid under the conditions of this can be completely dissolved the aluminium dirt of equipment wall, save the trouble of manual cleaning, utilize chemistry
The production capacity of method restorer, rapidly and efficiently.
Further description, stop addition crystal seed after, stand still for crystals no less than 2 it is small when after, recycle aluminium hydroxide.
It not is violent chemical reaction process, it is necessary to stand that the crystallization of aluminium hydroxide, which is precipitated, and aluminium hydroxide is made fully to analyse
Go out.
Further description, in described No.1 retort 21, No. two retort 22, recycling can 4 and Sewage treatment tanks 6
Equipped with blender 04, it is stirred when adding aluminium hydroxide crystal seed and carrying out separation of solid and liquid.
Further description also continues to stirring no less than 60 minutes after stopping addition aluminium hydroxide crystal seed.
More than content is only presently preferred embodiments of the present invention, according to the invention for those of ordinary skill in the art
Thought, there will be changes, this specification content should not be construed as to the present invention in specific embodiments and applications
Limitation.
Claims (10)
1. a kind of system for stewing mould liquid recycling aluminium hydroxide, it is characterised in that：Including stewing mould liquid collection system, stewing mould liquid processing system
System stews mould liquid separation system and stews mould liquid and reacts recovery system again with water；
Pot mould liquid collection system includes stewing mould liquid recycling can and No.1 pump；Pot mould liquid collection system stews mould for collecting
Liquid；
Pot mould liquid treating system includes retort, No. two pumps and aluminium hydroxide crystal seed holding vessel；Pot mould liquid processing system
It unites to carry out the chemical reaction for stewing mould liquid and produces aluminium hydroxide；
Pot mould liquid separation system includes recycling can and centrifuge；The mould liquid separation system that stews is used for the hydrogen-oxygen that will be produced
Change aluminium separation of solid and liquid；
Pot mould liquid reacts recovery system with water again includes Sewage treatment tank and No. three pumps；Pot mould liquid is reacted back again with water
Receipts system is used to the waste water after separation of solid and liquid being recycled；
No. two pot mould liquid recycling can, No.1 pump, retort pumps are sequentially connected with recycling can by pipeline；The retort bag
Include No.1 retort and No. two retort；No.1 pump is respectively by being equipped with the pipeline of No.1 valve and pipeline equipped with No. two valves
It is connected with the No.1 retort and No. two retort；The outlet of No. two pumps is anti-by another pipeline and the No.1
It answers and is connected at the top of tank and No. two retort；It is connected by the outlet of the recycling can with the centrifuge；Pot mould liquid returns
20 No. two valves are equipped between closed cans and No.1 pump；Between the No.1 retort and No. two retort and No. two pumps
Equipped with No. nine valves；The inlet of the recycling can is equipped with ten No. six valves；17 are equipped between the recycling can and the centrifuge
Number valve；The aluminium hydroxide crystal seed holding vessel is connected by being equipped with the pipeline of No. ten valves with No. two pumps；
The entrance of the Sewage treatment tank is connected by pipeline with the centrifuge；The bottom of the Sewage treatment tank is by setting
The pipeline for having ten No. nine valves is connected with No. three pumps；The middle part of the Sewage treatment tank is by being equipped with the pipelines of ten No. eight valves
It is connected with No. three pumps；No. three pumps are connected by being equipped with the pipeline of two ride on Bus No. 11 valves with the No.1 retort
It is logical；The pipeline that No. three pumps are equipped with two No. ten valves by another is connected with stewing die cavity；The No.1 retort and two
Number reaction pot bottom be connected by pipeline with No. two pumps；The bottom of the No.1 retort is equipped with No. seven valves；Described two
The bottom of number retort is equipped with No. eight valves；No. nine valves are provided close at No. two pumps；The No.1 retort is led to respectively
It crosses and is connected equipped with No. three valves and the pipeline equipped with No. five valves with No. two pumps；No. two retort are respectively by being equipped with four
Number pipeline of valve and the pipeline equipped with No. six valves are connected with No. two pumps；No. two pumps are returned by pipeline and the waste water
Closed cans is connected, and ten No. two valves are being equipped at No. two pumps, and ten No. five are being equipped at the Sewage treatment tank
Valve；No. two pumps are connected by another pipeline with the No.1 retort and No. two retort respectively, and close to institute
It states and ride on Bus No. 11 valve is equipped at No. two pumps, ten No. three valves are being equipped at the No.1 retort, close to described No. two reactions
Ten No. four valves are equipped at tank.
2. a kind of system for stewing mould liquid recycling aluminium hydroxide according to claim 1, it is characterised in that：According to claim
A kind of system of pot mould liquid production aluminium hydroxide, it is characterised in that：The No.1 retort and No. two retort it is upper
Side, which is equipped with, to be prevented from stewing the overflow pipe that mould hydrorrhea goes out；The overflow pipe is connected with the Sewage treatment tank.
3. a kind of system for stewing mould liquid recycling aluminium hydroxide according to claim 1, it is characterised in that：The No.1 reaction
Blender is equipped in tank, No. two retort, recycling can and Sewage treatment tank.
4. use the work for stewing mould liquid recycling aluminium hydroxide of the system as described in claim 1 for stewing mould liquid recycling aluminium hydroxide
Skill, which is characterized in that include the following steps：
Step 1：Open 20 No. two valves, No.1 valve, No. two valves, close No. three valves, No. four valves, No. five valves, No. six
Valve, No. seven valves, No. eight valves open the No.1 pump, and pending pot mould liquid pump is entered the No.1 retort and No. two retort
In, it completes to stew the operation of mould liquid collection system；
Step 2：Close No. three valves, No. four valves, No. five valves, No. six valves, No. eight valves, No. ten valves, ten No. two valves, ten No. four
Valve；No. seven valve valves, No. nine valves, ride on Bus No. 11 valve, ten No. three valves are opened, open No. two pumps, cycle pending pot mould liquid；Two
Number pump keep systemic circulation it is pending stew mould liquid under conditions of, open No. ten valves, by aluminium hydroxide crystal seed using negative pressure sucking described in
No.1 retort is reacted；Valve switch is adjusted, aluminium hydroxide crystal seed is sucked described two using negative pressure in the same way
Number retort is reacted；
Step 3：No. three valves or No. five valves are opened, open No. nine valves, ten No. two valves, ten No. five valves, it will be upper in No.1 retort
Clear liquid is put into the Sewage treatment tank；Close ride on Bus No. 11 valve, ten No. five valves, ten No. seven valves；Open No. seven valves, ten No. six valves；It opens
No. two pumps are opened, the solidliquid mixture in the No.1 retort is pumped into the recycling can；Open ionization scheming；Open ten No. seven
Valve, separation of solid and liquid aluminium hydroxide, and recovered liquid is delivered to Sewage treatment tank；Valve switch is adjusted, is separated in the same way
Aluminium hydroxide and liquid in No. two retort；
Step 4：Ten No. five valves, ten No. eight valves, ten No. nine valves are closed, by Sewage treatment into the Sewage treatment tank；Close ten
No. five valves, ten No. nine valves, two ride on Bus No. 11 valves open ten No. eight valves, two No. ten valves, open No. three pumps, send supernatant back to pot mould
Slot；Close ten No. eight valves, two No. ten valves；Open ten No. nine valves, two ride on Bus No. 11 valves；No. three pumps are opened, by the solid-liquid of aluminium hydroxide
Mixture sends No.1 retort circulation and stress back to；
Step 5：90-100 ° of pot mould liquid is put into pot mould liquid recycling can, order stews mould liquid successively by pot mould liquid
Collection system stews mould liquid treating system, stews mould liquid separation system and stews mould liquid and reacts recovery system again with water, dissolves in each system
Aluminium dirt, complete to stew mould liquid recycling aluminium hydroxide system scale removal.
5. the technique according to claim 4 for stewing mould liquid recycling aluminium hydroxide, it is characterised in that：Hydrogen-oxygen is added in step 2
Change aluminium crystal seed, when aluminium ion concentration is reduced to below 30g/L in reaction solution, stop addition aluminium hydroxide crystal seed.
6. the technique according to claim 4 for stewing mould liquid recycling aluminium hydroxide, it is characterised in that：It is returned in the step 1
The free alkali concentration and aluminum ions concentration proportion of pot mould liquid of receipts are between 3.00-3.50.
7. the technique according to claim 4 for stewing mould liquid recycling aluminium hydroxide, it is characterised in that：Added in the step 5
Free alkali concentration is more than 4.00 with aluminum ions concentration proportion in pot mould liquid of 90-100 ° added.
8. the technique according to claim 5 for stewing mould liquid recycling aluminium hydroxide, it is characterised in that：After stopping addition crystal seed,
Stand still for crystals no less than 2 it is small when after, recycle aluminium hydroxide.
9. the technique according to claim 4 for stewing mould liquid recycling aluminium hydroxide, it is characterised in that：The No.1 retort,
Be equipped with blender in No. two retort, recycling can and Sewage treatment tank, when adding aluminium hydroxide crystal seed and carry out solid-liquid
It is stirred during separation.
10. the technique according to claim 9 for stewing mould liquid recycling aluminium hydroxide, it is characterised in that：Stop addition hydroxide
Stirring is also continued to after aluminium crystal seed no less than 60 minutes.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN109112537A (en) * | 2018-07-27 | 2019-01-01 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | Configuration and technique of the oxidation solution for oil removing neutralizer recycling aluminium hydroxide and sodium sulphate |
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| CN113025415A (en) * | 2021-03-10 | 2021-06-25 | 德清骄阳建材贸易有限公司 | A environmental protection processing system for aluminium alloy drawing of patterns waste liquid |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109112546A (en) * | 2018-07-27 | 2019-01-01 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | Stew the oxidation line configuration and technique of mould liquid recycling aluminium hydroxide and sodium sulphate |
| CN109112537A (en) * | 2018-07-27 | 2019-01-01 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | Configuration and technique of the oxidation solution for oil removing neutralizer recycling aluminium hydroxide and sodium sulphate |
| CN109133131A (en) * | 2018-07-27 | 2019-01-04 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | Oxidation solution and the System and method for for stewing in mould liquid and recycling aluminium hydroxide and sodium sulphate |
| 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 |
| CN109133131B (en) * | 2018-07-27 | 2021-01-12 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | System and method for neutralizing and recovering aluminum hydroxide and sodium sulfate from oxidation liquid and mold-cooking liquid |
| CN109112537B (en) * | 2018-07-27 | 2021-08-03 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | Device and process for recovering aluminum hydroxide and sodium sulfate from oxidation liquid and deoiling neutralization liquid |
| CN113025415A (en) * | 2021-03-10 | 2021-06-25 | 德清骄阳建材贸易有限公司 | A environmental protection processing system for aluminium alloy drawing of patterns waste liquid |
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