CN103451436B - System for neutralizing treatment of demoulding waste liquor and anodic oxidation waste liquor and recovery of aluminum ions of aluminum processing plant - Google Patents
System for neutralizing treatment of demoulding waste liquor and anodic oxidation waste liquor and recovery of aluminum ions of aluminum processing plant Download PDFInfo
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Abstract
The invention discloses a system for neutralizing treatment of demoulding waste liquor and anodic oxidation waste liquor and recovery of aluminum ions of an aluminum processing plant. The system comprises an alkaline system, an acidic system, a neutralizing system, a pneumatic agitating system and a filter press and packaging system, wherein the alkaline system and the acidic system are respectively connected to the neutralizing system through pipelines; the pneumatic agitating system is arranged in the neutralizing system; the filter press and packaging system is arranged at the back of the neutralizing system through a pipeline; and another pipeline connected with a wastewater tank is arranged on the filter press and packaging system. The alkaline system is composed of a No 1 demoulding waste liquor tank, a No 2 demoulding waste liquor tank, a No 1 pump and pipelines. The neutralizing system is composed of a No 1 neutralizing tank, a No 2 neutralizing tank and pipelines. According to the system, oxidization waste liquor and demoulding waste liquor of the aluminum processing plant are conveyed to a neutralizing tank to be subjected to complete harmless treatment within pH (Potential of Hydrogen) of 6 to 8; a large amount of aluminium hydroxide byproducts can be recovered; and the cost of treating waste liquor can be greatly decreased.
Description
Technical field
The present invention relates to the recovery process of aluminium alloy processing-waste neutralizing treatment and metallic aluminium, belong to aluminium manufacture field.
Background technology
Pot mould liquid refers to extruding grinding tool aluminium stub bar demoulding alkali lye used.During fluting, pot mould liquid NaOH concentration is between 300-400g/L, and along with the increase of pot modulus, aluminium ion concentration rises, and pot mould speed constantly declines, and when aluminum ion reaches 60-70g/L, pot mould is too slow, needs down groove, forms waste liquid.To produce the aluminum material factory of 200,000 tons per year, pot mould waste liquid amount is 10000 tons, and molten aluminum amount is more than 650 ton, and potential economic worth is very large.At present, aluminium processing enterprise does not only utilize its economic worth, on the contrary in order to process this waste liquid, and the heavy environmental burden of back.
Alumilite process liquid refers to the tank liquor that aluminium alloy anode oxide is used.During fluting, anodizing solution H
2sO
4concentration is between 160-200g/L, as not having aluminum ion in tank liquor, strong to oxide film dissolving power.During anodic oxidation 30 minutes, the molten aluminum amount of section bar per ton is about 3.84Kg (400m
2/ T).Along with the accumulation of aluminium molten in tank liquor, Al
3+to H
+and SO
4 2-footprint increase, seriously hinder H
+to negative electrode, SO
4 2-anode moves, and tank liquor conductivity declines.When aluminium ion concentration reaches more than 20g/, tank liquor resistance is too large, and according to constant voltage technique, current density obviously reduces, and causes thicknesses of layers deficiency, transparency decline, even occurs the non-uniform phenomenons such as the vestige of white spot or striped or other shapes; According to continuous current technique, voltage can be caused again to raise, power consumption increases, and also may occur rete burn and close the phenomenons such as rear blackening time serious.
Aluminum ion in anodizing solution, directly affects the conductivity of tank liquor, and determine oxidation energy consumption and film quality, optimum control concentration should between 3-10g/L scope, and now obtained oxidation film corrosion resistance, wear resistance are best.But consider reagent cost and environmental protection pressure, in actual production, aluminium ion concentration general control is interval at 10-20g/L.
Change with coating mass in view of aluminium ion concentration and be oxidized the energy consumption relation important just like this, aluminium processing enterprise generally adopts two kinds of methods to control aluminum ions.
One method being down groove, namely when aluminium ion concentration is more than 20g/L, the tank liquor of falling half, supplementing sulfuric acid to concentration is after 180g/L, continues to produce.To produce 200000 tons of aluminum material factories per year, the oxidation waste liquid poured out every year about 6000 tons, both wasted medicament, bore again the environmental protection pressure of the so a large amount of spent acid of process, also have lost more than 120 ton of callable bauxite resource.
Two is adopt retrieval of sulfuric acid machine.Retrieval of sulfuric acid machine is aluminum ions stabilizing deyice, sour pump is adopted the sulfuric acid of oxidation trough and the mixed solution of Tai-Ace S 150 to be pumped in separating tank. because separating tank is built with the exotic materials with cationic exchange, quickly and efficiently sulfuric acid is separated with aluminum ion, aluminum ion is discharged outside solution, sulfuric acid is sent back in oxidation trough and continue to use, thus make the aluminum ion constantly produced in production discharge outside solution, the aluminium ion concentration reached in tank liquor is stabilized in the interior object of certain processing range, and the foreign material such as organism in tank liquor can be purified, this device long-time running is without the need to changing tank liquor.Theoretically, this device can make aluminium material oxidation film thickness and stay in grade, and also for stable section bar coloring process provides good basis, but in actual motion, problem is many.Such as, certain model retrieval of sulfuric acid machine need consume water and be about 1.5m
3/ h, about consumes electricity 3 degree, i.e. monthly water consumption 1080 tons, power consumption 2160 degree.These 1080 tons of water are measured, finds wherein sulfur acid 35-45g/L, aluminum ion 4-5g/L, namely monthly discharged 194.4 tons of sulfuric acid.Monthly so water consumption power consumption, the effect of acquisition but has few improvement than falling groove, and in view of the result of use of the above-mentioned bad luck of retrieval of sulfuric acid machine, most of aluminium processing enterprise, this device of progressively stopping using, has recovered the traditional method of the oxidation of falling half tank liquor.
To sum up, modern aluminum processing enterprise, have a large amount of pot mould waste liquids and anodic oxidation waste liquid in need of immediate treatment, and existing treatment process: is directly discharge into wastewater treatment center, has both added processing cost, wastes again bauxite resource; Two Shi Qing professional treatment producers pull away, and these treatment plants, if pot mould waste lye that single-item handling is a large amount of, a large amount of acid solutions need be consumed; If the oxidized waste acid solution that single-item handling is a large amount of, need consume a large amount of alkali lye, society has paid expensive processing cost for this reason.
Summary of the invention
The present invention is intended to overcome the deficiencies in the prior art, and goal of the invention of the present invention is to provide a kind of and saves production cost, reduce aluminum fabrication plant pot mould waste liquid of environmental protection pressure and aluminium resource waste and anodic oxidation waste liquid neutralizing treatment and aluminum ions recovery system.
Goal of the invention of the present invention is also to provide a kind of brand-new recovery process, will stew mould waste liquid and anodic oxidation waste liquid neutralizing treatment, and aluminum ion all reclaims, and changes into the Al (0H) of technical grade
3turn waste into wealth.
Technical scheme of the present invention is achieved in that
Aluminum fabrication plant pot mould waste liquid and anodic oxidation waste liquid neutralizing treatment and aluminum ions recovery system, it is characterized in that, by alkaline system, acidic system, neutralized system, pneumatic stirring system, press filtration and packaging system are formed, described alkaline system and acidic system are connected to described neutralized system respectively by pipeline, described pneumatic stirring system is set in described neutralized system, described press filtration and packaging system by install pipeline after described neutralized system, and described press filtration and packaging system are provided with the pipeline be connected with wastewater disposal basin, described alkaline system is by 1# pot mould waste liquid tank, 2# pot mould waste liquid tank, 1# pump and pipeline composition, described neutralized system is by 1# neutralization tank, 2# neutralization tank and pipeline composition.
Preferably, described 1# pump and described pipelining to be stewed the top of mould waste liquid tank in stew mould waste liquid tank and 2# of described 1#, the pipeline that described 1# pot mould waste liquid tank is connected with described 1# pump is provided with 6# valve, the pipeline that described 2# pot mould waste liquid tank is connected with described 1# pump is provided with 7# valve, the pipeline that described 1# pump is connected with described neutralized system is provided with 8# valve, the pipeline that described 1# pump is connected with described neutralized system is provided with 9# valve, and stew mould waste liquid tank and 2# of described 1# stews the pipe connecting being connected with between mould waste liquid tank and being provided with 10# valve; Stew mould waste liquid tank and 2# of institute 1# stews mould waste liquid tank for storing pot mould waste liquid, and by 1# pump by Cemented filling in 1# neutralization tank and/or 2# neutralization tank.
Preferably, the bottom of described 1# pot mould waste liquid tank, 2# pot mould waste liquid tank is respectively equipped with 11# valve, 12# valve.
Preferably, described acidic system is by 1# oxidized waste flow container, 2# oxidized waste flow container, 2# pump and pipeline composition, described 2# pump and pipelining are in described 1# oxidized waste flow container, the bottom of 2# oxidized waste flow container, the pipeline that described 1# oxidized waste flow container is connected with described 2# pump is provided with 1# valve, the pipeline that described 2# oxidized waste flow container is connected with described 2# pump is provided with 2# valve, described 2# pump and described 1# neutralization tank, 2# neutralization tank connecting tube is respectively equipped with 3# valve, 4# valve, and be connected with the connecting tube being provided with 5# valve between described 1# oxidized waste flow container and described 2# oxidized waste flow container, described 1# oxidized waste flow container and described 2# oxidized waste flow container are for storing oxidation waste liquid, and by 2# pump by Cemented filling in 1# neutralization tank and/or 2# neutralization tank.
Preferably, described pneumatic stirring system is made up of the gentle stirring pipe of air compressor, is provided with 13# valve in described air compressor and described 1# with tank connected pipeline, is provided with 14# valve in described air compressor and described 2# with tank connected pipeline.
Preferably, described 1# neutralization tank and 2# neutralization tank, for neutralizing oxidation waste liquid and pot mould waste liquid, generate crystalline aluminum hydroxide.
Preferably, the pipeline that described 1# neutralization tank is connected with described press filtration and packaging system is provided with 15# valve, and the pipeline that described 2# neutralization tank is connected with described press filtration and packaging system is provided with 16# valve.
Use pot mould waste liquid of the aluminum fabrication plant described in claim 1 and anodic oxidation waste liquid neutralizing treatment and aluminum ions recovery system to reclaim an aluminum ions technique, it is characterized in that, comprise the following steps:
Step 1, open 1#, 3# valve and 2# pump, first add the setting liquid level of oxidation spent acid solution to 1# neutralization tank, open 13# valve to start to stir, then open 6#, 8# valve and 1# pump and add pot mould waste lye, first quick and back slow, use pH test paper, survey limit, limit adds, and when pH value is 6-8, stops adding pot mould waste lye, continue stirring 10 minutes, leave standstill 2 hours;
Step 2, unlatching belt filter press, open 15# valve, pressure-filteration drying, obtain aluminum hydroxide product;
Step 3, closedown 3# valve, open 4# valve and 2# pump, first adds oxidation spent acid solution to the setting liquid level of 2# neutralization tank, open 14# valve, start to stir; Close 8# valve, then open 9# valve and 1# pump adds pot mould waste lye, first quick and back slow, use pH test paper, survey limit, limit adds, and when pH value is 6-8, stops adding pot mould waste lye, continues stirring 10 minutes, leave standstill 2 hours;
Step 4, unlatching belt filter press, open 16# valve, pressure-filteration drying, obtain aluminum hydroxide product.
Preferably, the volume ratio of described pot mould waste lye and described oxidized waste acid solution is 1:1.5, and the acid-base material in neutralization tank reacts and generates Al (0H) 3 precipitation.
Preferably, handled chemical agent is pot aging waste lye of die cavity and the aging spent acid solution of oxidation trough, and reaction end is PH7.0, and the byproduct of production is technical grade aluminium hydroxide.
In the present invention, during pot mould, there is following chemical reaction in the aluminium stub bar in grinding tool in Alkaline etchant:
Al
2o
3+ 2NaOH=2NaAlO
2+ H
2o (removing natural oxide film) (1)
2Al+2NaOH+2H
2o=2NaAlO
2+ 3H
2↑ (molten aluminium) (2)
NaAlO
2+ 2H
2o=Al (OH)
3↓+NaOH (tank liquor decomposes, regeneration alkali lye) (3)
2Al (OH)
3=Al
2o
3.3H
2o (cell wall fouling, blocking pipe) (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 decomposes, and fouling, can not Cemented filling be carried out!
By (3) formula, reduce alkali concn, react and move to the right, easily generate crystalline aluminum hydroxide and separate out.If enter oxidation spent acid in pot mould liquid, then there is following reaction:
2NaAlO
2+2H
2O+H
2SO
4＝2Al(OH)
3↓+Na
2SO
4(5)
Namely in pot mould waste liquid, add oxidation waste liquid, the aluminum ion in two kinds of waste liquids can be reclaimed in the lump, generate aluminium hydroxide.
Get pot mould waste lye: total alkali 327.21g/L free NaOH 280.8g/L Al
3+31.32g/L
Oxidized waste acid solution: total acid 261.66g/L dissociates H
2sO
4164.64g/L Al
3+20.55g/L
According to the form below is tested:
| Get pot mould alkali lye | 500ml | 500ml | 500ml | 500ml | 500ml |
| Add oxidation tank liquor | 200ml | 400ml | 500ml | 550ml | 750ml |
| Free NaOH g/L | 150.67 | 74.4 | 42.9 | 34 | ------ |
| Al 3+g/L | 41.04 | 21.42 | 10.44 | 9.36 | ------ |
| Total alkali g/L | 182.4 | 95.2 | 58.4 | 48 | ------ |
| PH value | 14 | 13～14 | 12～13 | 12 | 7 |
| Temperature DEG C | 51 | 58 | 56 | 57 | 57 |
Experimental data shows, along with the increase of oxidation waste liquid addition, free alkali, aluminum ion and pH all decline, and temperature rises; When being oxidized waste liquid and being added into 750ml, pH is 7, and temperature is 57 DEG C, and soda acid neutralizes completely, and arrive reaction end, at this moment both volume ratios are 1:1.5.Produce the aluminum fabrication plant of section bar 200,000 tons per year, within 1 year, produce pot mould waste liquid 10000 tons, oxidation waste liquid 6000 tons.Will neutralize pot mould waste liquid completely, oxidation waste liquid differs from 9000 tons, and for this reason, the aluminum ions upper control limit of adjustable oxidation trough, such as, can be reduced to 10g/L by 20g/L.If so, oxidation spent acid can be poured out more, meet the neutralization requirement of pot mould waste liquid.As previously mentioned, the aluminum ion in anodizing solution, optimum concn should control within 3-l0g/L scope, and now obtained oxidation film corrosion resistance, wear resistance are best, and oxidation energy consumption is low.At present, the aluminium ion concentration in anodizing tank, each enterprise basic controlling is between 10-20g/L, interval far beyond optimum concn.Aluminium ion concentration is high, and resistance is large, and energy consumption is high, and coating mass is poor, and these are industry common recognitions.But be limited by the environmental protection pressure of process oxidation spent acid, enterprise is forced to select to improve aluminum ion upper control limit, reduces the quantity discharged of oxidation spent acid.
The proposition of pot mould liquid waste disposal scheme, oxidation spent acid, by unnecessary environmental burden, becomes rare industrial chemicals, needs the oxidation solution pouring out more than former technique more than one times from oxidation trough, could meet the needs of neutralization completely of pot mould waste liquid.
Outwardly, this fado that does has got sulfuric acid in oxidation trough, adds oxidating chemicals cost, but by the detailed analysis to oxidation mechanism, can understand the benefit place of turning down oxidation solution aluminium ion concentration completely.
In oxidation solution, there is Al
3+, H
+and SO
4 2-, when not having added electric field, the mode of motion of these three kinds of ions in oxidation solution is two kinds: vibrations and drift.With Al
3+for example, its mode of motion is:
(1) in the spherical region, centered by a certain trim point, vibrations, are its range of influence by the maximum cross-section of the centre of sphere, are called concussion cross section;
(2), from a trim point float to next trim point, then continue vibrations, this migration is drift motion; Drift is unordered, and vibrations are eternal;
After added electric field, each ion is except drift and vibrations, and also have the orientation movement along power line direction, concentration progressively forms Gradient distribution:
(a), SO
4 2-to anode movement after added electric field, near forming anode, concentration is high, the Gradient distribution that near negative electrode, concentration is low; At anode, form following electrochemical reaction:
SO
4 2--2e=2O+SO
2↑ (losing electronics, release Sauerstoffatom) (6)
2Al+3O=Al
2o
3(aluminium oxide alloy, oxygenerating film) (7)
Al
2o
3+ 3H
+=2Al
3++ 3OH
-(oxide film dissolving) (8)
(b), Al
3+, H
+to cathode motion after added electric field, near forming negative electrode, concentration is high, the Gradient distribution that near anode, concentration is low; At negative electrode, form following electrochemical reaction:
2H
++ 2e=H
2↑ (obtaining electronics, release hydrogen) (9)
Because ionic radius is different, H
+prior to Al
3+arrive cathode surface, again because current potential is different, H
+preferential acquisition electronics, Al
3+can only rest in oxidation solution and constantly accumulate.From (6) (9) formula, the conductive capability at the two poles of the earth place is by the SO of anode
4 2-with the H at negative electrode place
+concentration determine.Along with continuing of electrolysis, the ion near the two poles of the earth constantly consumes, and needs the SO of far-end
4 2-and H
+constantly supplement, oxidation is carried out continuously.At this moment, SO
4 2-and H
+to the complexity of the two poles of the earth movement, determine the key problem of tank liquor conductive capability, directly determined by aluminium ion concentration.Suppose in oxidation trough, a certain area being parallel to the two poles of the earth is the number at the aluminum ion vibrations center that the cross section of A is passed is N, and each aluminum ions concussion cross section is S, then on this cross section, aluminum ions total footprint is NS, SO
4 2-and H
+during by this cross section, affecting less useful area by aluminum ion interception is A-NS.It can thus be appreciated that aluminium ion concentration is higher, N is larger, and useful area is less, SO
4 2-and H
+the difficulty passed through is larger, and tank liquor resistance is larger.But according to (8) formula, reduce aluminium ion concentration, react and move to the right, oxide film dissolves to be accelerated, therefore aluminium ion concentration can not be too low.Production practice prove, oxidation trough aluminum ion optimum concn is 3-l0g/L, and this interval rete is best, and tank liquor resistance is less, and energy consumption is low, and less energy-consumption and high film quality, be enough to compensate the reagent cost how oxidation solution increases.
So, this recovery process is designed as a whole pot mould liquid and oxidation solution, in order to neutralize pot mould waste liquid completely, the aluminium ion concentration upper limit of adjustment oxidation trough, make it to get back within optimum concn 3-l0g/L scope, thus oxidation waste liquid can be taken fully from oxidation trough, realize reclaiming completely aluminum ions in the neutralization of pot mould liquid and two kinds of waste liquids.So, the aluminium ion concentration of oxidation trough, can be controlled within optimum concn 3-l0g/L scope.
Compared to prior art, beneficial effect of the present invention is:
1, anodic oxidation waste liquid is considered by the present invention first together with pot mould waste liquid, with acid waste liquid process alkaline waste liquor, anodic oxidation waste liquid pot mould waste liquid fully neutralizes, the abundant aluminum ion reclaimed in pot mould waste liquid and oxidation waste liquid, Shi Lv processing enterprise had both processed pot mould and the oxidation waste liquid of magnanimity, have also obtained the industry byproduct aluminium hydroxide of magnanimity;
2, the present invention proposes first by oxidation tank liquor aluminium ion concentration operation interval by 10-20g/L, and turn down the 3-l0g/L to the best, both optimized oxide film structure, again reduce tank liquor resistance, realization oxidation is energy-conservation;
3, the present invention arranges pot mould liquid waste disposal workshop in aluminium processing enterprise first, and next-door neighbour's pot mould workshop, pot mould liquid is not containing complexing agent, easy decomposition, not easily long distance transhipment, is more not suitable for pipeline transportation, pot mould workshop is closed in pot mould liquid waste disposal workshop, and waste liquid transhipment, than being easier to, reduces production cost;
4, the present invention is according to the labile feature of pot mould waste liquid, arranges first and extracts liquid from pot mould waste liquid tank top, avoid block pumps, pipeline and valve;
5, the feature that the present invention easily decomposes according to pot mould waste liquid, aluminium hydroxide easily changes into aluminium stone, neutralization tank, supporting pipe and valve are carried out acidproof design, production process design is become alkali after first acid, avoid the risk of neutralization tank fouling, ducts and valve blockage, guarantee to produce and carry out continuously.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is that the present invention stews mould waste liquid and oxidation waste liquid neutralizing treatment and the schematic diagram of aluminum ion recovery system.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Aluminum fabrication plant pot mould waste liquid and anodic oxidation waste liquid neutralizing treatment and aluminum ions recovery process, be produce a large amount of pot mould waste liquid every year according to Ge Lv processing enterprise and be oxidized waste liquid, and individually process, both increased processing cost, and wasted bauxite resource again.For the present situation in industry, the present invention designs the system that a kind of pot mould waste liquid directly neutralizes oxidation waste liquid first, the aluminum ion in two kinds of waste liquids is all changed into the aluminium hydroxide of technical grade.
As shown in Figure 1, aluminum fabrication plant pot mould waste liquid and anodic oxidation waste liquid neutralizing treatment and aluminum ions recovery system, be made up of alkaline system, acidic system, neutralized system, pneumatic stirring system, press filtration and packaging system, alkaline system and acidic system are connected to neutralized system respectively by pipeline, pneumatic stirring system is set in neutralized system, press filtration and packaging system are by install pipeline after neutralized system, and press filtration and packaging system are provided with the pipeline be connected with wastewater disposal basin.
In the present invention, alkaline system is by the 1# pot mould waste liquid tank by alkaline-resisting design, 2# pot mould waste liquid tank, 1# pump and pipeline composition, , consider that pot mould waste liquid easily decomposes, blocking pipe and valve, 1# pump selects electrolemma pump or air film pump, and 1# pump and pipelining to be stewed the top of mould waste liquid tank in stew mould waste liquid tank and 2# of 1#, the pipeline that 1# pot mould waste liquid tank is connected with 1# pump is provided with 6# valve, the pipeline that 2# pot mould waste liquid tank is connected with 1# pump is provided with 7# valve, the pipeline that 1# pump is connected with neutralized system is provided with 8# valve, the pipeline that 1# pump is connected with neutralized system is provided with 9# valve, stew mould waste liquid tank and 2# of 1# stews the pipe connecting being connected with between mould waste liquid tank and being provided with 10# valve, neutralized system is made up of 1# neutralization tank, 2# neutralization tank and pipeline, stew mould waste liquid tank and 2# of 1# stews mould waste liquid tank for storing pot mould waste liquid, and by 1# pump by Cemented filling in 1# neutralization tank and/or 2# neutralization tank, 1# neutralization tank and 2# neutralization tank, for neutralizing oxidation waste liquid and pot mould waste liquid, generate crystalline aluminum hydroxide.The bottom of 1# pot mould waste liquid tank, 2# pot mould waste liquid tank is respectively equipped with 11# valve, 12# valve, is keep in repair for the ease of the clear end.
In the present invention, acidic system is by the 1# oxidized waste flow container by acidproof design, 2# oxidized waste flow container, 2# pump and pipeline composition, consider that oxidation waste liquid is regardless of solution, not blocking pipe and valve, 2# pump and pipelining are in 1# oxidized waste flow container, the bottom of 2# oxidized waste flow container, acid proof pump selected by 2# pump, the pipeline that the bottom of 1# oxidized waste flow container is connected with 2# pump is provided with 1# valve, the pipeline that the bottom of 2# oxidized waste flow container is connected with 2# pump is provided with 2# valve, 2# pump and 1# neutralization tank, 2# neutralization tank connecting tube is respectively equipped with 3# valve, 4# valve, and be connected with the connecting tube being provided with 5# valve between 1# oxidized waste flow container and 2# oxidized waste flow container, 1# oxidized waste flow container and 2# oxidized waste flow container are for storing oxidation waste liquid, and by 2# by Cemented filling in 1# neutralization tank and/or 2# neutralization tank.
In the present invention, pneumatic stirring system is made up of the gentle stirring pipe of air compressor, 13# valve is provided with tank connected pipeline in air compressor and 1#, 14# valve is provided with tank connected pipeline in air compressor and 2#, in neutralization tank, only gas agitating is set, be consider that neutralization reaction is fairly simple, mix.Stir according to motor, both power consumptions, dangerous again, keep in repair cumbersome.The pipeline that 1# neutralization tank is connected with press filtration and packaging system is provided with 15# valve, and the pipeline that 2# neutralization tank is connected with press filtration and packaging system is provided with 16# valve.
In the present invention, consider that pot mould waste liquid easily decomposes, the not easily feature of long-distance Cemented filling, native system should arrange independent pot mould liquid waste disposal workshop, next-door neighbour's pot mould workshop, and convenient mould waste collection of stewing is to pot mould waste liquid tank.Oxidation waste liquid can long-distance Cemented filling, can lay pipeline, directly collected by oxidation waste liquid and be delivered to oxidized waste flow container between pot mould liquid waste disposal workshop and oxidation workshop.
Further, alkaline system is used for collecting, storing pot mould waste liquid, and is delivered to neutralized system; Acidic system is used for collecting, storing oxidation waste liquid, and is delivered to neutralized system; Neutralized system is used for the neutralization reaction of two kinds of waste liquids, and produces aluminium hydroxide, and neutralized system is by acidproof design.Production process step is as follows:
1,1#, 3# valve and 2# pump is opened, first add the setting liquid level of oxidation spent acid to 1# neutralization tank, open 13# valve to start to stir, then open 6#, 8# valve and 1# pump and add pot mould salkali waste, first quick and back slow, use pH test paper, survey limit, limit adds, and when pH value is 6-8, stops adding pot mould waste liquid, continue stirring 10 minutes, leave standstill 2 hours;
2, open belt filter press, open 15# valve, pressure-filteration drying, obtain aluminum hydroxide product;
3, close 3# valve, open 4# valve and 2# pump, first add oxidation spent acid to the setting liquid level of 2# neutralization tank, open 14# valve, start to stir; Close 8# valve, then open 9# valve and 1# pump adds pot mould salkali waste, first quick and back slow, use pH test paper, survey limit, limit adds, and when pH value is 6-8, stops adding pot mould waste liquid, continues stirring 10 minutes, leave standstill 2 hours;
4, open belt filter press, open 16# valve, pressure-filteration drying, obtain aluminum hydroxide product.
In the present invention, the volume ratio of pot mould waste lye and oxidized waste acid solution is 1:1.5, and the acid-base material in neutralization tank reacts and generates Al (0H)
3precipitation, handled chemical agent is pot aging waste lye of die cavity and the aging spent acid solution of oxidation trough, and reaction end is PH7.0, and the byproduct of production is technical grade aluminium hydroxide.
In the present invention, neutralization tank originally can run in the basic conditions, namely first adds pot mould waste liquid, then adds oxidation waste liquid and be adjusted to neutrality, completes reaction.So, common carbon steel and valve is selected.But run in the basic conditions for a long time, the easy fouling of tank skin, the valve at the bottom of tank and pipeline easily block, and need often keep in repair, and can cause stopping production time serious.So, although be reclaim the aluminum ion in alkalescence pot mould waste liquid, also can by neutralization tank and supporting pipe and valve by acidproof design, response hierarchy is first Plus acidic oxidation waste liquid, then pot mould waste liquid adding alkalescence is adjusted to neutrality, completes reaction.So, each takes turns production, and tank skin and bottom valve and pipeline all experience once acid process, and alkaline residue alkali dirt can be dissolved, and guarantees to produce and carries out continuously.
In order to realize process 10000 tons pot mould waste liquid, the target of 15000 tons of oxidation waste liquids, is configured with two 40m
3pot mould waste liquid tank, two 40m
3oxidized waste flow container, two 15m
3neutralization tank, a belt filter press, and supporting pipeline, pump and valve.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. aluminum fabrication plant pot mould waste liquid and anodic oxidation waste liquid neutralizing treatment and aluminum ions recovery system, it is characterized in that, by alkaline system, acidic system, neutralized system, pneumatic stirring system, press filtration and packaging system are formed, described alkaline system and acidic system are connected to described neutralized system respectively by pipeline, described pneumatic stirring system is set in described neutralized system, described press filtration and packaging system by install pipeline after described neutralized system, and described press filtration and packaging system are provided with the pipeline be connected with wastewater disposal basin, described alkaline system is by 1# pot mould waste liquid tank, 2# pot mould waste liquid tank, 1# pump and pipeline composition, described neutralized system is by 1# neutralization tank, 2# neutralization tank and pipeline composition.
2. aluminum fabrication plant according to claim 1 pot mould waste liquid and anodic oxidation waste liquid neutralizing treatment and aluminum ions recovery system, it is characterized in that, described 1# pump and described pipelining to be stewed the top of mould waste liquid tank in stew mould waste liquid tank and 2# of described 1#, the pipeline that described 1# pot mould waste liquid tank is connected with described 1# pump is provided with 6# valve, the pipeline that described 2# pot mould waste liquid tank is connected with described 1# pump is provided with 7# valve, the pipeline that described 1# pump is connected with described neutralized system is provided with 8# valve, the pipeline that described 1# pump is connected with described neutralized system is provided with 9# valve, stew mould waste liquid tank and 2# of described 1# stews the pipe connecting being connected with between mould waste liquid tank and being provided with 10# valve, stew mould waste liquid tank and 2# of institute 1# stews mould waste liquid tank for storing pot mould waste liquid, and by 1# pump by Cemented filling in 1# neutralization tank and/or 2# neutralization tank.
3. aluminum fabrication plant according to claim 1 pot mould waste liquid and anodic oxidation waste liquid neutralizing treatment and aluminum ions recovery system, is characterized in that, described 1# stew mould waste liquid tank, 2# pot mould waste liquid tank bottom be respectively equipped with 11# valve, 12# valve.
4. aluminum fabrication plant according to claim 2 pot mould waste liquid and anodic oxidation waste liquid neutralizing treatment and aluminum ions recovery system, it is characterized in that, described acidic system is by 1# oxidized waste flow container, 2# oxidized waste flow container, 2# pump and pipeline composition, described 2# pump and pipelining are in described 1# oxidized waste flow container, the bottom of 2# oxidized waste flow container, the pipeline that described 1# oxidized waste flow container is connected with described 2# pump is provided with 1# valve, the pipeline that described 2# oxidized waste flow container is connected with described 2# pump is provided with 2# valve, described 2# pump and described 1# neutralization tank, 2# neutralization tank connecting tube is respectively equipped with 3# valve, 4# valve, and be connected with the connecting tube being provided with 5# valve between described 1# oxidized waste flow container and described 2# oxidized waste flow container, described 1# oxidized waste flow container and described 2# oxidized waste flow container are for storing oxidation waste liquid, and by 2# pump by Cemented filling in 1# neutralization tank and/or 2# neutralization tank.
5. aluminum fabrication plant according to claim 4 pot mould waste liquid and anodic oxidation waste liquid neutralizing treatment and aluminum ions recovery system, it is characterized in that, described pneumatic stirring system is made up of the gentle stirring pipe of air compressor, be provided with 13# valve with tank connected pipeline in described air compressor and described 1#, in described air compressor and described 2#, be provided with 14# valve with tank connected pipeline.
6. aluminum fabrication plant according to claim 1 pot mould waste liquid and anodic oxidation waste liquid neutralizing treatment and aluminum ions recovery system, is characterized in that, described 1# neutralization tank and 2# neutralization tank are for neutralizing oxidation waste liquid and pot mould waste liquid, generation crystalline aluminum hydroxide.
7. aluminum fabrication plant according to claim 5 pot mould waste liquid and anodic oxidation waste liquid neutralizing treatment and aluminum ions recovery system, it is characterized in that, the pipeline that described 1# neutralization tank is connected with described press filtration and packaging system is provided with 15# valve, and the pipeline that described 2# neutralization tank is connected with described press filtration and packaging system is provided with 16# valve.
8. use pot mould waste liquid of the aluminum fabrication plant described in claim 7 and anodic oxidation waste liquid neutralizing treatment and aluminum ions recovery system to reclaim an aluminum ions technique, it is characterized in that, comprise the following steps:
Step 1, open 1#, 3# valve and 2# pump, first add the setting liquid level of oxidation spent acid solution to 1# neutralization tank, open 13# valve to start to stir, then open 6#, 8# valve and 1# pump and add pot mould waste lye, first quick and back slow, use pH test paper, survey limit, limit adds, and when pH value is 6-8, stops adding pot mould waste lye, continue stirring 10 minutes, leave standstill 2 hours;
Step 2, unlatching belt filter press, open 15# valve, pressure-filteration drying, obtain aluminum hydroxide product;
Step 3, closedown 3# valve, open 4# valve and 2# pump, first adds oxidation spent acid solution to the setting liquid level of 2# neutralization tank, open 14# valve, start to stir; Close 8# valve, then open 9# valve and 1# pump adds pot mould waste lye, first quick and back slow, use pH test paper, survey limit, limit adds, and when pH value is 6-8, stops adding pot mould waste lye, continues stirring 10 minutes, leave standstill 2 hours;
Step 4, unlatching belt filter press, open 16# valve, pressure-filteration drying, obtain aluminum hydroxide product.
9. a kind of pot mould waste liquid of the aluminum fabrication plant described in claim 7 and anodic oxidation waste liquid neutralizing treatment and aluminum ions recovery system of using according to claim 8 reclaims aluminum ions technique, it is characterized in that, the volume ratio of described pot mould waste lye and described oxidized waste acid solution is 1:1.5, and the acid-base material in neutralization tank reacts and generates Al (0H)
3precipitation.
10. a kind of pot mould waste liquid of the aluminum fabrication plant described in claim 7 and anodic oxidation waste liquid neutralizing treatment and aluminum ions recovery system of using according to claim 9 reclaims aluminum ions technique, it is characterized in that, handled chemical agent is pot aging waste lye of die cavity and the aging spent acid solution of oxidation trough, reaction end is PH7.0, and the byproduct of production is technical grade aluminium hydroxide.
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| CN115180759B (en) * | 2022-06-24 | 2023-09-29 | 中国乐凯集团有限公司 | Method and system for recycling waste acid and waste alkali in aluminum and aluminum alloy treatment process |
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| CN102021595B (en) * | 2010-10-21 | 2012-08-01 | 佛山市三水雄鹰铝表面技术创新中心有限公司 | Surface pre-treatment system combining four aluminum alloy working grooves into whole for full recovery of medicament and zero emission of wastewater |
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