CN109112546A - Stew the oxidation line configuration and technique of mould liquid recycling aluminium hydroxide and sodium sulphate - Google Patents

Stew the oxidation line configuration and technique of mould liquid recycling aluminium hydroxide and sodium sulphate Download PDF

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Publication number
CN109112546A
CN109112546A CN201810843468.5A CN201810843468A CN109112546A CN 109112546 A CN109112546 A CN 109112546A CN 201810843468 A CN201810843468 A CN 201810843468A CN 109112546 A CN109112546 A CN 109112546A
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China
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valves
tank
pumps
liquid
filtrate
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CN201810843468.5A
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CN109112546B (en
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熊映明
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FOSHAN SANSHUI XIONGYING INNOVATIVE CENTER FOR ALUMINUM SURFACE TECHNOLOGIES Co Ltd
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FOSHAN SANSHUI XIONGYING INNOVATIVE CENTER FOR ALUMINUM SURFACE TECHNOLOGIES Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/46—Regeneration of etching compositions
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/08—Apparatus, e.g. for photomechanical printing surfaces
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/10—Etching compositions
    • C23F1/14—Aqueous compositions
    • C23F1/32—Alkaline compositions
    • C23F1/36—Alkaline compositions for etching aluminium or alloys thereof

Abstract

The oxidation line of pot mould liquid recycling aluminium hydroxide and sodium sulphate configures and technique, in configuration, the connection adjacent with mould liquid collecting tank is stewed of secondary filtrate collecting pit, No. six pumps, pot die cavity, waste water curb；Stew pot mould that die cavity is used for aluminium；Degreasing tank, flowing rinsing bowl, alkaline etching slot, the first Alkaline etchant entrapping tank, the second Alkaline etchant entrapping tank, high-pressure atomization spray groove and neutralization chamber are sequentially connected；Mould liquid collecting tank, No. seven pumps and alkaline etching slot is stewed to be sequentially connected；Second Alkaline etchant entrapping tank, No. nine pumps and secondary filtrate collecting pit are sequentially connected；First Alkaline etchant entrapping tank, No. eight pumps and Alkaline etchant collecting tank are sequentially connected；Alkaline etchant collecting tank collects Waste alkaline solution, and reaches reaction liquid treating system；Reaction liquid treating system, filtrate collection system and first-time filtrate separation system are sequentially connected；Waste alkaline solution in oxidation waste liquid reaction is added in reaction liquid treating system, is isolated aluminium hydroxide and sodium sulphate by filtrate collection system and first-time filtrate separation system by its technique.

Description

Stew the oxidation line configuration and technique of mould liquid recycling aluminium hydroxide and sodium sulphate
Technical field
The present invention relates to aluminum processing technology field more particularly to a kind of oxygen for stewing mould liquid recycling aluminium hydroxide and sodium sulphate Change line configuration and technique, is actually the oxidation line configuration and technique for stewing mould liquid and recycling aluminium hydroxide and sodium sulphate for Alkaline etchant.
Background technique
Aluminium alloy has many advantages, such as that processing performance is excellent, corrosion resistance is good, surface aesthetic, the rate of recovery are high, in building, traffic The industries such as transport, machinery, electric power are applied widely.In recent years, aluminium is for copper, aluminium generation wood, aluminium for steel, expansion aluminium application model The trend enclosed is more obvious.Aluminium processing industry is both conventional industries, is even more full of the rising industry of vitality.But in economy Under new normality, the common problem that aluminium processing industry energy consumption is high, total amount of pollutants discharged is big, resource recycling rate is low is highlighted as system The about bottleneck and obstacle of industry development.
Aluminium industry production includes the processes such as electrolysis, founding, pressure processing, surface treatment, and each process can generate when production Different degrees of exhaust gas, waste water, waste residue.A large amount of aluminium ash is generated when electrolysis and founding, it is useless that extrusion process generates pot mould alkalinity Liquid, it is useless that surface treatment process generates all kinds of waste water containing the complicated components such as acid, alkali, treatment agent and chromium, nickel heavy metal ion Slag.
Summary of the invention
It is an object of the invention to propose that the oxidation line for stewing mould liquid recycling aluminium hydroxide and sodium sulphate configures, in structure Using secondary filtrate as recovery system；
The purpose of the present invention also proposes to stew the technique of the oxidation line configuration of mould liquid recycling aluminium hydroxide and sodium sulphate, energy Efficiently separate out sodium hydroxide and sodium sulphate.
To achieve this purpose, the present invention adopts the following technical scheme:
Stew the oxidation line configuration of mould liquid recycling aluminium hydroxide and sodium sulphate, comprising: secondary filtrate collecting pit stews mould waste liquid Processing system, raw material liquid waste treatment system, reaction liquid treating system and first-time filtrate collection system；
Pot mould liquid waste treatment system includes: No. six pumps, stews die cavity, waste water curb, stews mould liquid collecting tank；
The secondary filtrate collecting pit, No. six pumps stew die cavity, waste water curb successively phase adjacent with mould liquid collecting tank is stewed Lead to and connects；High-pressure atomization hydraulic giant is equipped in the waste water curb；The high-pressure atomization hydraulic giant interlinks with No. six pumps It connects；Pot mould for stewing die cavity and being used for aluminium；
The Waste alkaline solution processing system includes: that Waste alkaline solution generates system and Waste alkaline solution collection system；The alkaline etching It includes: alkaline etching slot, the first Alkaline etchant entrapping tank, the second Alkaline etchant entrapping tank, Alkaline etchant collecting tank, No. seven that waste liquid, which generates system, Pump, No. eight pumps and No. nine pumps；The Waste alkaline solution collection system include: degreasing tank, flowing rinsing bowl, high-pressure atomization spray groove, Neutralization chamber, spray liquid collecting tank；
The degreasing tank, flowing rinsing bowl, alkaline etching slot, the first Alkaline etchant entrapping tank, the second Alkaline etchant entrapping tank, high pressure Atomizing spray slot and neutralization chamber are sequentially connected；Pot mould liquid collecting tank, No. seven pumps and alkaline etching slot are sequentially connected；Described second Alkaline etchant entrapping tank, No. nine pumps and secondary filtrate collecting pit are sequentially connected；The first Alkaline etchant entrapping tank, No. eight pumps and institute Alkaline etchant collecting tank is stated to be sequentially connected；The high-pressure atomization spray groove and flowing rinsing bowl are connected to water inlet respectively；The high pressure Atomizing spray slot, spray liquid collecting tank, No. nine pumps and the second Alkaline etchant entrapping tank are sequentially communicated connection, and No. nine pumps also connect It is connected to the secondary filtrate collecting pit；
It is pumped by described No. seven, pot mould liquid in the waste water curb is successively by stewing mould liquid collecting tank and alkaline etching slot； The degreasing tank and flowing rinsing bowl are respectively used to processing aluminium；The alkaline etching slot is used to handle pot mould liquid collecting tank Mould liquid, and treated the aluminium of degreasing tank and circulating water described in alkaline etching are stewed, Waste alkaline solution is generated；The first Alkaline etchant retention Slot and the second Alkaline etchant entrapping tank treated for cleaning alkaline etching slot aluminium；The high-pressure atomization spray groove is for spraying Drench aluminium after the alkaline etching slot is handled；The neutralization chamber is used for aluminium after neutralisation treatment；The Alkaline etchant collecting tank is for collecting The Waste alkaline solution of the first Alkaline etchant entrapping tank, and Waste alkaline solution is reached into the reaction liquid treating system；
The reaction liquid treating system, filtrate collection system and first-time filtrate separation system are sequentially communicated connection；
The reaction liquid treating system receives the Waste alkaline solution of the Alkaline etchant collecting tank, and oxidation waste liquid is added therewith It mixes and reacts, then aluminium hydroxide and first-time filtrate are being isolated by the filtrate collection system, by the first-time filtrate point First-time filtrate is isolated into sodium sulphate from system；
The second Alkaline etchant entrapping tank, spray liquid collecting tank and high-pressure atomization spray groove are sequentially connected, the spray liquid The connecting line of collecting tank and the second Alkaline etchant entrapping tank be equipped with No. nine pump, the spray liquid collecting tank, No. nine pump and Secondary filtrate collecting pit is sequentially connected, and the secondary filtrate collecting pit is also used to collect the second Alkaline etchant entrapping tank and height Press the Waste alkaline solution of atomizing spray slot.
It further explains, the mould liquid collecting tank that stews is given up by pot mould after having sodium hydroxide to react with aluminium-making mould Liquid；
When by pot mould liquid collecting tank, compare between the free alkali concentration and aluminum ions concentration for stewing mould waste liquid Value is 3.8-4.2；
When by the alkaline etching slot, ratio is between the free alkali concentration and aluminum ions concentration for stewing mould waste liquid 3.5-4.0。
It further explains, the reaction liquid treating system includes: reaction solution add-on system and reaction liquid separation system；
The reaction solution add-on system includes: oxidation solution collecting tank, reactor tank, No.1 pump and No. two pumps；The oxidation solution Collecting tank, No.1 pump and reactor tank are sequentially communicated connection respectively, make the oxidation waste liquid of the oxidation solution collecting tank by described one Number pump is transferred to the reactor tank；The reactor tank and the Alkaline etchant collecting tank are connected with No. two pumps, make described No. two Pump reaches the Waste alkaline solution of the Alkaline etchant collecting tank in the reactor tank；
The reaction liquid separation system includes: to be separated by solid-liquid separation tank, the first centrifuge, the first filtrate recycling can and No. three pumps； The separation of solid and liquid tank, first centrifuge, the first filtrate recycling can and the adjacent company of being sequentially communicated of No. three pumps It connects；
The upper layer of the reactor tank, No. two pumps and the first filtrate recycling can are sequentially communicated connection, and No. two pumps are used for will The first-time filtrate of the first filtrate recycling can is transmitted to the reactor tank；
The upper end for being separated by solid-liquid separation tank, the first filtrate recycling can and No. two pumps and the reactor tank are connected respectively；
The first filtrate recycling pot bottom and middle part are respectively equipped with the pipeline for leading to No. three pumps, and respectively by ten No. nine valves and ten No. eight valve controls；No. three pumps are also connected with the reactor tank；
First centrifuge is used to isolate gasification sodium between 7.00-7.50 in pH, and by liquid guide flow to described First filtrate recycling can；No. three pumps are connected with the first-time filtrate separation system, make in the first filtrate recycling can After first-time filtrate reaches the first-time filtrate separation system, separated in pH by the first-time filtrate separation system between 7.00- 7.50 sodium sulphate out.
It further explains, the quantity of the reactor tank is 2；Between the reactor tank respectively at the middle part of the two side wall, Lower part and the bottom of the reactor tank are connected, and are commonly connected to No. two pumps；
No. two pumps are in the upper layer for connecting the reactor tank, and connecting line is in one of them reactor tank Inlet is equipped with ten No. three valves, is equipped with ten No. four valves in the inlet of another reactor tank；
One of them described reactor tank is equipped with No. three valves in the exit at middle part, is equipped with No. five valves in the exit of lower part, And the bottom of the reactor tank is equipped with No. seven valves；Another reactor tank is equipped with No. four valves in the exit at middle part, in the outlet of lower part Place is equipped with No. six valves, and the bottom of the reactor tank is equipped with No. eight valves；The reactor tank is commonly connected to the connection of No. two pumps Pipeline is equipped with No. nine valves；
No.1 pump is connected to the top of the reactor tank, and in being respectively equipped with No.1 valve on the pipeline of connection.
It further explains, the filtrate collection system includes: sulfate crystal tank, No. four pumps, the second centrifuge, the Two filtrate recycling cans and No. five pumps；It is No. three pumps, sulfate crystal tank, No. four pumps, second centrifuge, described Second filtrate recycling can and No. five pumps adjacent are sequentially communicated connection；No. three pumps access in the sulfate crystal tank； No. five pumps are connected in the secondary filtrate collecting pit；
Ice maker is equipped in the sulfate crystal tank；Second centrifuge is for isolating sodium sulphate.
It further explains, several is equipped in pot die cavity and stews mold container；It is described stew mold container entrance respectively with No. six pumps connection, and the entrance for stewing mold container is equipped with 40 No. four valves；It gives up with described the outlet for stewing mold container The connection of water curb, and the outlet for stewing mold container is equipped with 30 No. two valves；
It further explains, the side of the reactor tank is equipped with anti-overflow lip；The anti-overflow lip is set to the reaction pot sidewall Top and middle part between position；The first filtrate recycling can is connect with the anti-overflow lip by pipeline respectively；
The reactor tank is separated by solid-liquid separation in tank, filtrate recycling can and sulfate crystal tank equipped with blender.
It further explains, the technique for stewing the oxidation line configuration of mould liquid recycling aluminium hydroxide and sodium sulphate, including following step It is rapid: (1) to stew mould devil liquor recovery, (2) Waste alkaline solution generates, (3) Waste alkaline solution is collected, (4) oxidation waste collection, (5) alkaline etching are given up Liquid addition, (6) reaction solution lock out operation, (7) first-time filtrate are collected and recycling, the recycling of (8) sodium sulphate, (9) secondary filtrate are received Collection；
Beneficial effects of the present invention:
1, the present invention uses secondary filtrate as recovery system for the first time: it slots to die cavity is stewed, the secondary filtrate of reuse；With secondary Filtrate cleans mold by high-pressure atomization hydraulic giant, reduces water for cleaning, it is ensured that pot mould liquid waste concentration of recycling；It is big when stewing mould Under the premise of water, the sal glauberi of amount evaporation consume mass crystallization water, stews the big system water shortage in mould workshop, entirely stews mould vehicle Between thoroughly blocked by the spray-water of high-pressure atomization spray groove and stew modulo operation and through No. nine pump moisturizings to secondary filtrate collecting pit With pollution of the sodium ion to waste water center in alkaline etching operation, waste water and dregs zero-emission is realized；Utilize No. five secondary filtrates of pumped back Collecting pit is recycled, and waiting is recycled next time, and the sodium ion at waste water center is thoroughly isolated, and realizes and stews mould plant effluent waste residue Zero-emission removes maximum sodium ion obstacle for Treated sewage reusing；
2, R of the invention is the ratio that sodium hydroxide makes free alkali concentration and aluminium ion concentration, and sufficiently research stews for the first time The decomposition rule of mould liquid show that R=3.00 is sodium metaaluminate decomposition point；Under the conditions of no crystal seed, R >=3.50, stewing mould liquid can Pipeline；Under the conditions of no crystal seed, R >=4.00, stewing mould liquid can long term storage；Alkaline etchant, storage are converted into stew mould liquid Be delivered to alkaline etching slot, laid solid online recycling basis.
3, the present invention is for the first time reaction solution using oxidation waste liquid, the Waste alkaline solution of recycling is added, in pH between 7.00- Between 7.50, aluminium hydroxide and sodium sulphate byproduct are recycled, obtains the recovery product of purity is high.
Detailed description of the invention
Fig. 1 is the structure chart of raw material liquid waste treatment system；
Fig. 2 is secondary filtrate collecting pit and the connection structure diagram for stewing mould liquid waste treatment system；
Fig. 3 is raw material liquid waste treatment system, the connection structure diagram for reacting liquid treating system and filtrate collection system；
Fig. 4 is the structure chart of first-time filtrate separation system；
Wherein:
Oxidation solution collecting tank 1, reactor tank 2, Alkaline etchant collecting tank 3, be separated by solid-liquid separation tank 4, the first centrifuge 51, second from Scheming 52, the second filtrate recycling can 62, stews die cavity 7, waste water curb 8, secondary filtrate collecting pit at first filtrate recycling can 61 9, sulfate crystal tank 111；High-pressure atomization hydraulic giant 81；Stew mould liquid collecting tank 99；Water inlet 88；
Degreasing tank 71, flowing rinsing bowl 72, alkaline etching slot 74, the first Alkaline etchant entrapping tank 75, the second Alkaline etchant entrapping tank 76, high-pressure atomization spray groove 77, neutralization chamber 78；Spray liquid collecting tank 771
No.1 pumps the pump 05, six pump 06, seven of pump 04, five of pump 03, four of 01, No. two pump 02, three and pumps 07, No. eight The pump 010 of pump 09, ten of pump 08, nine；
0006, No. seven valve 0007, eight of valve of valve 0005, six of valve 0004, five of valve 0003, four of No.1 valve 0001, three Number valve 0010 of valve 0009, ten of valve 0008, nine；The valve 0012,13 valve 0013,14 of ride on Bus No. 11 valve 0011,12 0018, ten No. nine valve 0019,20 of valve of valve 0017,18 of valve 0016,17 of valve 0015,16 of valve 0014,15 Number valve 0020；Two valves 0022 of ride on Bus No. 11 valve 0021,22；20 No. five valves, 0025,20 No. six valve 0026,27 Number 0029, three No. ten valve 0030 of valve of valve 0028,29 of valve 0027,28；Three ride on Bus No. 11 valves 0031,32 Valve 0032；40 No. four valves 0044；50 No. six valves 0057,58 valve 0058,59 of valve 0056,57 Valve 0059；Six valves 0063 of valve 0062,63 of valve 0060,62 of ride on Bus No. 11 valve 0061,60；
Specific embodiment
To further illustrate the technical scheme of the present invention below with reference to the accompanying drawings and specific embodiments.
Stew the oxidation line configuration of mould liquid recycling aluminium hydroxide and sodium sulphate, comprising: secondary filtrate collecting pit 9 stews mould waste liquid Processing system, raw material liquid waste treatment system, reaction liquid treating system and first-time filtrate collection system；
Pot mould liquid waste treatment system includes: No. six pumps 06, stews die cavity 7, waste water curb 8, stews mould liquid collecting tank 99；
The secondary filtrate collecting pit 9, six pumps 06, pot die cavity 7, waste water curb 8 and pot mould liquid collecting tank 99 are adjacent It is sequentially communicated connection；High-pressure atomization hydraulic giant 81 is equipped in the waste water curb 8；The high-pressure atomization hydraulic giant 81 and described six Number pump 06 is connected；Pot mould for stewing die cavity 7 and being used for aluminium；
The Waste alkaline solution processing system includes: that Waste alkaline solution generates system and Waste alkaline solution collection system；The alkaline etching It includes: alkaline etching slot 74, the first Alkaline etchant entrapping tank 75, the second Alkaline etchant entrapping tank 76, Alkaline etchant collecting tank that waste liquid, which generates system, 3,07, No. eight pump 08 of No. seven pumps and No. nine pumps 09；The Waste alkaline solution collection system includes: degreasing tank 71, flowing rinsing bowl 72, high-pressure atomization spray groove 77, neutralization chamber 78, spray liquid collecting tank 771；
The degreasing tank 71, flowing rinsing bowl 72, alkaline etching slot 74, the first Alkaline etchant entrapping tank 75, the retention of the second Alkaline etchant Slot 76, high-pressure atomization spray groove 77 and neutralization chamber 78 are sequentially connected；Pot mould liquid collecting tank 99, seven pumps 07 and alkaline etching slot 74 are sequentially connected；The second Alkaline etchant entrapping tank 76, nine pumps 09 and secondary filtrate collecting pit 9 are sequentially connected；Described first Alkaline etchant entrapping tank 75, eight pumps 08 and the Alkaline etchant collecting tank 3 are sequentially connected；The high-pressure atomization spray groove 77 and stream Dynamic rinsing bowl 72 is connected to water inlet 88 respectively；The high-pressure atomization spray groove 77, spray liquid collecting tank 771, nine pumps 09 and the Two Alkaline etchant entrapping tanks 76 are sequentially communicated connection, and No. nine pumps 09 are also connected with the secondary filtrate collecting pit 9；
By described No. seven pumps 07, pot mould liquid in the waste water curb 8, which successively passes through, stews mould liquid collecting tank 99 and alkali Lose slot 74；The degreasing tank 71 and flowing rinsing bowl 72 are respectively used to processing aluminium；The alkaline etching slot 74 is for handling described pot Pot mould liquid of mould liquid collecting tank 99, and treated the aluminium of degreasing tank 71 and circulating water described in alkaline etching, generate Waste alkaline solution；Institute State the first Alkaline etchant entrapping tank 75 and the second Alkaline etchant entrapping tank 76 for cleaning the alkaline etching slot 74 treated aluminium；Institute High-pressure atomization spray groove 77 is stated for spraying aluminium after the alkaline etching slot 74 is handled；After the neutralization chamber 78 is used for neutralisation treatment Aluminium；The Alkaline etchant collecting tank 3 is used to collect the Waste alkaline solution of the first Alkaline etchant entrapping tank 75, and by Waste alkaline solution Reach the reaction liquid treating system；
The reaction liquid treating system, filtrate collection system and first-time filtrate separation system are sequentially communicated connection；
The reaction liquid treating system receives the Waste alkaline solution of the Alkaline etchant collecting tank 3, and oxidation waste liquid is added therewith It mixes and reacts, then aluminium hydroxide and first-time filtrate are being isolated by the filtrate collection system, by the first-time filtrate point First-time filtrate is isolated into sodium sulphate from system；
The second Alkaline etchant entrapping tank 76, spray liquid collecting tank 771 and high-pressure atomization spray groove 77 are sequentially connected, institute The connecting line for stating spray liquid collecting tank 771 and the second Alkaline etchant entrapping tank 76 is equipped with No. nine pumps 09, the spray liquid Collecting tank 771, nine pumps 09 and secondary filtrate collecting pit 9 are sequentially connected, and the secondary filtrate collecting pit 9 is also used to collect institute State the Waste alkaline solution of the second Alkaline etchant entrapping tank 76 and high-pressure atomization spray groove 77.
It further explains, the present invention uses secondary filtrate as recovery system for the first time: slotting to die cavity 7 is stewed, reuse is secondary Filtrate；Mold is cleaned by high-pressure atomization hydraulic giant with secondary filtrate, reduces water for cleaning, it is ensured that pot mould liquid waste concentration of recycling； Under the premise of the water, sal glauberi of the largely evaporation when stewing mould consume mass crystallization water, the big system water shortage in pot mould workshop, Mould workshop is entirely stewed by the spray-water of high-pressure atomization spray groove, and through No. nine 09 moisturizings of pump to secondary filtrate collecting pit 9, it is thorough Bottom, which blocks, stews pollution of the sodium ion to waste water center in modulo operation and alkaline etching operation, realizes waste water and dregs zero-emission；Utilize No. five Pump 05 is sent secondary filtrate collecting pit 9 back to and is recycled, and waiting is recycled next time, and the sodium ion at waste water center is thoroughly isolated, and realizes The waste residue zero-emission of mould plant effluent is stewed, removes maximum sodium ion obstacle for Treated sewage reusing；
It further explains, pot mould liquid collecting tank 99 passes through pot mould after having sodium hydroxide to react with aluminium-making mould Waste liquid；
When by pot mould liquid collecting tank 99, between the free alkali concentration and aluminum ions concentration for stewing mould waste liquid Ratio is 3.8-4.2；
When by the alkaline etching slot 74, ratio is between the free alkali concentration and aluminum ions concentration for stewing mould waste liquid 3.5-4.0。
It further explains, the present invention sufficiently studies the decomposition rule for stewing mould liquid for the first time, show that R=3.00 is meta-aluminic acid Sodium decomposition point；Under the conditions of no crystal seed, R >=3.50, stewing mould liquid can pipeline；Under the conditions of no crystal seed, R >=4.00, Stewing mould liquid can long term storage；
Waste alkaline solution collection system is arranged in the present invention for the first time, is responsible for giving up the alkaline etching that the first Alkaline etchant entrapping tank 75 retains Liquid is sent into Alkaline etchant collecting tank 3；The spray liquid that spray liquid collecting tank 771 is collected is sent into the second Alkaline etchant entrapping tank 76, reversely The first Alkaline etchant entrapping tank 75 is flowed back to, the retention of Waste alkaline solution step, the front is high and the back is low for concentration, reversed to collect；Extra spray liquid pump Enter secondary filtrate collecting pit 9, to the moisturizing of mould workshop, entire pot mould workshop and oxidation workshop waste water containing sodium fully recovering is stewed, thoroughly Block pollution of the sodium ion to waste water center；
It further explains, the reaction liquid treating system includes: reaction solution add-on system and reaction liquid separation system；
The reaction solution add-on system includes: oxidation solution collecting tank 1, reactor tank 2, No.1 pump 01 and No. two pumps 02；It is described Oxidation solution collecting tank 1, No.1 pump 01 and reactor tank 2 are sequentially communicated connection respectively, keep the oxidation of the oxidation solution collecting tank 1 useless Liquid is transferred to the reactor tank 2 by No.1 pump 01；The reactor tank 2 and the Alkaline etchant collecting tank 3 are connected with described No. two pumps 02 reach No. two pumps 02 in the reactor tank 2 Waste alkaline solution of the Alkaline etchant collecting tank 3；
The reaction liquid separation system includes: to be separated by solid-liquid separation tank 4, the first centrifuge 51, the first filtrate recycling can 61 and three Number pump 03；The separation of solid and liquid tank 4,03 phase of first centrifuge 51, the first filtrate recycling can 61 and No. three pumps Neighbour is sequentially communicated connection；
The upper layer of the reactor tank 2, No. two pumps 02 and the first filtrate recycling can 61 are sequentially communicated connection, No. two pumps 02 for transmitting the first-time filtrate of the first filtrate recycling can 61 to the reactor tank 2；
The upper end for being separated by solid-liquid separation tank 4, the first filtrate recycling can 61 and No. two pumps 02 and the reactor tank 2 distinguish phase Lead to and connects；
First filtrate recycling can, 61 bottom and middle part are respectively equipped with the pipeline for leading to No. three pumps 03, and respectively It is controlled by ten No. nine valve 0019 and ten No. eight valves 0018；No. three pumps 03 are also connected with the reactor tank 2；
First centrifuge 51 is used to isolate gasification sodium between 7.00-7.50 in pH, and by liquid guide flow to institute State the first filtrate recycling can 61；No. three pumps 03 are connected with the first-time filtrate separation system, recycle first filtrate After first-time filtrate in tank 61 reaches the first-time filtrate separation system, it is situated between by first-time filtrate separation system separation in pH Go out sodium sulphate in 7.00-7.50.
It further explains, the quantity of the reactor tank 2 is 2；Respectively in the two side wall between the reactor tank 2 The bottom in portion, lower part and the reactor tank 2 is connected, and is commonly connected to No. two pumps 02；
No. two pumps 02 are in the upper layer for connecting the reactor tank 2, and connecting line is in one of them reactor tank 2 inlet is equipped with ten No. three valves 0013, is equipped with ten No. four valves 0014 in the inlet of another reactor tank 2；
One of them described reactor tank 2 is equipped with No. three valves 0003 in the exit at middle part, is equipped with five in the exit of lower part Number valve 0005, and the bottom of the reactor tank 2 is equipped with No. seven valves 0007；Another reactor tank 2 is equipped with No. four in the exit at middle part Valve 0004 is equipped with No. six valves 0006 in the exit of lower part, and the bottom of the reactor tank 2 is equipped with No. eight valves 0008；The reaction The connecting line that tank 2 is commonly connected to No. two pumps 02 is equipped with No. nine valves 0009；
No.1 pump 01 is connected to the top of the reactor tank 2, and in being respectively equipped with No.1 on the pipeline of connection Valve 0001.
It further explains, No. ten valves 0010 are arranged in the present invention in reaction solution add-on system for the first time, utilize ride on Bus No. 11 valve 0011, ten No. three valves, 0013, ten No. four valve 0014, the valve 0008 of valve 0007, eight of reactor tank 2, seven and No. two pumps 02 are formed Reaction solution circulation, No. ten valves 0010 are in the ingehious design of negative pressure, by Waste alkaline solution sucting reaction tank 2；Waste alkaline solution is at No. two It pumps and is sufficiently mixed, reacts with oxidation solution at 02, generate aluminium hydroxide, recycle metallic aluminium and sodium；
It further explains, the filtrate collection system includes: the 04, second centrifugation of sulfate crystal tank 111, four pumps Machine 52, the second filtrate recycling can 62 and No. five pumps 05；No. three pumps 03, sulfate crystal tank 111, No. four pumps 04, institute It states the second centrifuge 52, the second filtrate recycling can 62 and No. five pumps 05 and adjacent is sequentially communicated connection；No. three pumps In the 03 access sulfate crystal tank 111；No. five pumps 05 are connected in the secondary filtrate collecting pit 9；
Ice maker is equipped in the sulfate crystal tank 111；Second centrifuge 52 is for isolating sodium sulphate.
It further explains, is equipped with several in pot die cavity 7 and stews mold container；The entrance difference for stewing mold container It is connect with described No. six pumps 06, and the entrance for stewing mold container is equipped with 40 No. four valves 0044；The outlet for stewing mold container It is connect with the waste water curb 8, and the outlet for stewing mold container is equipped with 30 No. two valves 0032；
The connecting line of the secondary filtrate collecting pit 9 and No. six pumps 06 is equipped with 20 No. nine valves 0029；It is described No. six pumps 06 and the connecting line for stewing die cavity 7 are equipped with three No. ten valves 0030；The high-pressure atomization hydraulic giant 81 and No. six described The connecting line of pump 06 is equipped with three ride on Bus No. 11 valves 0031；
No. seven pumps 07 and the connecting line for stewing mould liquid collecting tank 99 are equipped with 50 No. six valves 0056；First alkali It loses liquid entrapping tank 75 and is equipped with 50 No. seven unidirectional valves 0057 to the alkaline etching slot 74；The second Alkaline etchant entrapping tank 76 to The first Alkaline etchant entrapping tank 75 is equipped with 50 No. eight unidirectional valves 0058；The first Alkaline etchant entrapping tank 75 and described The connecting line of No. eight pumps 08 is equipped with 50 No. nine valves 0059；The second Alkaline etchant entrapping tank 76 and No. nine pumps 09 Connecting line is equipped with 60 No. two valves 0062；The connecting line of described No. ten pumps 010 and the water inlet 88 is equipped with six No. ten valves 0060；The connecting line of the high-pressure atomization spray groove 77 and the high-pressure atomization spray groove 77 is equipped with six ride on Bus No. 11 valves 0061； The connecting line of No. nine pumps 09 and the secondary filtrate collecting pit 9 is equipped with 60 No. three valves 0063；
The connecting line of the oxidation solution collecting tank 1 and No.1 pump 01 is equipped with 20 No. two valves 0022；The alkaline etching Liquid collecting tank 3 is connected to 02 connecting line of the reactor tank 2 and No. two pumps, and the connecting line and the Alkaline etchant are received Collect and is equipped with No. ten valves 0010 between tank 3；No. two pumps 02 are also attached to through 2 top of reactor tank, and the connecting line It is equipped with ride on Bus No. 11 valve 0011；
No. two pumps 02 are equipped with ten No. six valves 0016 with the connecting line for being separated by solid-liquid separation tank 4；In first filter For liquid recycling can 61 on the connecting line of described No. two pumps 02, the inlet of the first filtrate recycling can 61 is equipped with ten No. five The exit of valve 0015, No. two pumps 02 is equipped with ten No. two valves 0012；The outlet port for being separated by solid-liquid separation tank 4 is equipped with ten No. seven valves 0017；
The connecting line of No. three pumps 03 and sulfate crystal tank 111 is equipped with two No. ten valves 0020；No. three pumps 03 Two ride on Bus No. 11 valves 0021 are equipped with the connecting line of the reactor tank 2；No. four pumps 04 and the sulfate crystal tank 111 Connecting line be equipped with 20 No. five valves 0025；The connecting line of No. four pumps 04 and the second centrifuge 52 is equipped with 26 Number valve 0026；The connecting line of the second filtrate recycling can 62 and No. five pumps 05 is equipped with 20 No. seven valves 0027；It is described secondary The connecting line of filtrate collecting pit 9 and No. five pumps 05 is equipped with 20 No. eight valves 0028.
It further explains, the side of the reactor tank 2 is equipped with anti-overflow lip；The anti-overflow lip is set to 2 side of reactor tank Position between the top and middle part of wall；The first filtrate recycling can 61 is connect with the anti-overflow lip by pipeline respectively；
The reactor tank 2 is separated by solid-liquid separation in tank 4, filtrate recycling can and sulfate crystal tank 111 equipped with blender.
It further explains, the production technology of the oxidation line configuration of pot mould liquid recycling aluminium hydroxide and sodium sulphate, including with Lower step:
(1) it stews mould devil liquor recovery: closing each valve and pump in pot die cavity 7；And open 20 No. nine valves 0029, three No. ten valve 0030 and 30 No. two valves 0032 start No. six pumps 06, fill the water for pot die cavity 7；By 150- The sodium hydroxide of 250g/L is pot die cavity fluting；Mold is hung in into pot die cavity 7 and makees pot modulo operation；Modulo operation to be stewed Mold is hung out after the completion, opens the three ride on Bus No. 11s valve 0031, starts No. six pumps 06, with the high-pressure atomization hydraulic giant 81 Mold is cleaned, mold dries recycling；The water for cleaning mold is guided to pot mould liquid collecting tank 99 to recycle；When pot mould liquid aluminium When ion reaches 60g/L or more, mould waste liquid will be stewed and be guided to pot mould liquid collecting tank 99；Adding mass fraction is 50% Liquid alkaline makes to stew the ratio of free alkali concentration and aluminium ion concentration in mould waste liquid and is adjusted between 3.8-4.2；Open described 56 Number valve 0056 starts No. seven pumps 07, will stew mould waste liquid as Alkaline etchant and be pumped into the alkaline etching slot 74；
(2) Waste alkaline solution generates: detect the alkaline etching slot 74 of Alkaline etchant, addition sodium hydroxide make free alkali concentration and The Ratio control of aluminium ion concentration is to 3.5-4.0；
Aluminium after oil removing in 2-5 minutes, cleans 60-120s, drip through the flowing rinsing bowl 72 in the degreasing tank 71 30s, subsequently into the alkaline etching slot 74；At 50-60 DEG C, alkaline etching 5-15 minutes；Again through 75 He of the first Alkaline etchant entrapping tank Second Alkaline etchant entrapping tank 76 cleans 60s, drip 30s；60s is sprayed through the high-pressure atomization spray groove 77, into neutralization chamber 78, it completes Waste alkaline solution and generates；
(3) Waste alkaline solution is collected: being opened described No. ten valves 0010, is started No. eight pumps 08, by first Alkaline etchant The Waste alkaline solution that entrapping tank 75 retains is sent into the Alkaline etchant collecting tank 3；No. nine pumps 09 are opened, by the spray liquid collecting tank 771 spray liquids collected are pumped into the second Alkaline etchant entrapping tank 76, through 60 No. two valves, 0062,50 No. eight valve 0058, reversely flow back to the first Alkaline etchant entrapping tank 75；
(4) it aoxidizes waste collection: opening 0001,20 No. two valve 0022 of the No.1 valve, start the No.1 pump 01, Oxidation waste liquid in the oxidation solution collecting tank 1 is pumped into the reactor tank 2；
(5) Waste alkaline solution adds: according to Waste alkaline solution titration oxidation waste liquid as a result, adding Waste alkaline solution needed for estimation Volume；
Close the valve 0008,12 of valve 0006, eight of valve 0005, six of valve 0004, five of No. three valves 0003, four Number valve 0012 and ten No. four valve 0014 opens 0011, ten No. three described 0007, No. nine valve 0009 of No. seven valves, ride on Bus No. 11 valve valve 0013, start No. two pumps 02, recycles the oxidation waste liquid of one of reactor tank 2；Or close No. three valves 0003, four Number valve 0012 and ten No. three valve 0013 of valve 0007,12 of valve 0006, seven of valve 0005, six of valve 0004, five opens institute 0011, ten No. four 0008, No. nine valve 0009 of No. eight valves, ride on Bus No. 11 valve valve 0014 are stated, starts No. two pumps 02, recycles another The oxidation waste liquid of a reactor tank 2；
Described No. ten valves 0010 are opened, it, will be described in the Waste alkaline solution sucking in the Alkaline etchant collecting tank 3 using negative pressure No. two pumps 02 are simultaneously sent into the reactor tank 2, neutralize oxidation waste liquid；Waste alkaline solution is added to reacting liquid pH value in 7.0-7.5, Reach reaction end, generates aluminium hydroxide and sodium sulphate；Described No. ten valves 0010 are closed, addition Waste alkaline solution is stopped；Continue to stir It mixes 30 minutes, stands 60 minutes；
(6) reaction solution lock out operation: the described valve 0006, seven of No. four valves 0004, six 0007, No. eight valve of valve is closed 0008,0011, ten No. six No. ten valves 0010, ride on Bus No. 11 valve valve 0016；No. three valves 0003 or No. five valves 0005 are opened, are beaten 0009, ten No. two valve 0012 and ten No. five valve 0015 of No. nine valves is opened, No. two pumps 02 are started, it will be in the reactor tank 2 Supernatant be pumped into the first filtrate recycling can 61；Close the valve 0015 of valve 0005,15 of No. three valves 0003, five With ten No. seven valves 0017, No. seven valve 0007 and ten No. six valves 0016 are opened, start No. two pumps 02, it will be in the reactor tank 2 Solidliquid mixture be pumped into the separation of solid and liquid tank 4 under stirring, start first centrifuge 51, open described ten No. seven Valve 0017 is separated by solid-liquid separation and isolates aluminium hydroxide and first-time filtrate after spraying；First-time filtrate is sent into first filtrate to return Closed cans 61；
Or close the valve 0005, seven of No. three valves 0003, five valve 0007, eight valve 0010, ten of valve 0008, ten 0011, ten No. six valve 0016 of No.1 valve；Open No. four valves 0004 or No. six valves 0006 and No. nine valves 0009, ten No. two valve 0012 and ten No. five valves 0015 start No. two pumps 02, the supernatant in the reactor tank 2 are pumped into described the One filtrate recycling can 61；Valve 0015 and ten No. seven valve 0017 of valve 0006,15 of No. four valves 0004, six is closed, is opened No. eight valve 0008 and ten No. six valves 0016 start No. two pumps 02, the solidliquid mixture in the reactor tank 2 are pumped into and is stirred The separation of solid and liquid tank 4 under state is mixed, first centrifuge 51 is started, opens ten No. seven valves 0017, is separated by solid-liquid separation With aluminium hydroxide and first-time filtrate are isolated after spray；Filtrate is sent into the first filtrate recycling can 61；
(7) first-time filtrate is collected and is recycled: closing the valve 0018,19 of ten No. five valves 0015,18 valve 0019, two No. ten valves 0020 and two ride on Bus No. 11 valves 0021 are collected first-time filtrate in the first filtrate recycling can 61, are completed First-time filtrate is collected；It closes ten No. nine valves 0019 and two ride on Bus No. 11 valves 0021, opens ten No. eight valves 0018 and described Two No. ten valves 0020 open No. three pumps 03, the supernatant in the filtrate recycling can are pumped into the sulfate crystal tank 111；Ten No. nine valves 0019 and two ride on Bus No. 11 valves 0021 are opened, ten No. eight valves 0018 and two No. ten valves are closed 0020, No. three pumps 03 are opened, sediment in the first filtrate recycling can 61 under stirring is pumped into reactor tank 2 In, secondary recovery is carried out, first-time filtrate recycling is completed；
(8) sodium sulphate recycles: closing 20 No. five valves 0025, opens the ice maker, cooling first-time filtrate is to 5 DEG C Hereinafter, sulfate crystal and being precipitated；Electricity stirring is opened, 20 No. five valves 0025 and 20 No. six valve 0026 is opened, is opened Second centrifuge 52 starts No. four pumps 04, solid-liquid separation sodium sulphate；Filtrate flows into the second filtrate recycling can 62, Complete sodium sulphate recovery system operating process；
(9) secondary filtrate is collected: being closed 20 No. seven valves 0027, is collected secondary filtrate；Open described 20 No. seven Valve 0027 and 20 No. eight valve 0028 opens No. five pumps 05, secondary filtrate is sent into the secondary filtrate collecting pit 9.
It further explains, the design utilizes sodium sulphate huge poor solubility at different temperatures, at 5 DEG C hereinafter, knot Crystalline substance separation and recovery sodium sulphate, improves the rate of recovery；
It further explains, in step (3), when the second Alkaline etchant entrapping tank 76 cannot refill spray liquid, opens six Ten No. three valves 0063 start No. nine pumps 09, extra spray liquid are pumped into the secondary filtrate collecting pit 9.
It further explains, the No.1 pump 01 is connected to the upper end of the reactor tank 2, makes described in the step (4) No.1 pump 01 injects the oxidation waste liquid in the oxidation solution collecting tank 1 from 2 upper end of reactor tank；
No. two pumps 02 are connected to the upper end of the reactor tank 2, make No. two pumps 02 described in the step (5) by institute The Alkaline etchant stated in Alkaline etchant collecting tank 3 is injected from 2 upper end of reactor tank.
It further explains, this adding method realizes that low level adds Waste alkaline solution, and a high position above reactor tank 2 is avoided to add Add, has not only prevented Waste alkaline solution from the addition of oxidation waste liquid upper surface, pyroreaction and splashed out the risk hurted sb.'s feelings, but also utilized No. two pumps 02 high-speed stirred is sufficiently mixed, and avoids lye agglomeration, is mitigated electricity stirring pressure, is substantially shortened the reaction time；
When stewing mould (alkaline etching), the aluminium material head in mold occurs to chemically react as follows in Alkaline etchant:
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, blocking pipeline) (4)
(2)+(3) formula, under basic conditions
2Al+6H2O=2Al (OH)3↓+3H2↑ (5)
(2) in (3) (5) formula, if generate Al (OH)3Precipitating depends on stewing mould liquid free alkali concentration, when R value is (free Alkali concentration/aluminium ion concentration) be greater than 3.5 when, aluminium is with NaAlO2Form exists, and when being lower than 3.5, decomposes and Al (OH) is precipitated3.In alkali Property under the conditions of, the essence for stewing the chemical reaction of mould liquid is aluminium reacts with water, and aluminium is dissolved, and water is decomposed, and discharges hydrogen, generate Hydroxyl stews the total alkali concentration of mould liquid and increases, and incrementss are a moles, of aluminum per mole of titanium metal, increase by three moles of total alkalis.
By (1) (2) two formula, alkali concentration is higher, and molten aluminium speed is faster；By (3) (4) (5) two formula, pot mould liquid is unstable, easily It decomposes, and fouling.By (3) (4) (5) formula, sodium metaaluminate is decomposed in order to prevent, can suitably increase naoh concentration, keeps inclined Aluminic acid stable sodium prevents reclaimer, pump, valve scaling, so that recycling stews mould liquid.
In pot mould liquid containing sodium metaaluminate, sulfuric acid (or oxidation waste liquid) is gradually added, following chemical reaction occurs:
It is reacted with a small amount of dilute sulfuric acid
2NaAlO2+H2SO4+2H2O=Na2SO4+2Al(OH)3↓ (7 or more pH value) (6)
It is reacted with excessive dilute sulfuric acid
2NaAlO2+4H2SO4==Na2SO4+Al2(SO4)3+4H2O (below pH value 4.89) (7)
(J is free alkali concentration g/L, and L is aluminium ion concentration g/L, and R is free alkali concentration/Al shown in table 13+Concentration).
The changing rule of 1 various concentration lye of table dissolution aluminium skimmings
Sample A
(1) index J=98.88, L=0 of slotting presses (1) formula, the oxidation on aluminium skimmings surface with the increase of aluminium skimmings additive amount Aluminium consumes free alkali, and J value gradually reduces；By (2) (5) formula, the dissolution of aluminium discharges hydrogen, generates total alkali, is converted into meta-aluminic acid Sodium does not consume free alkali, and L value is continuously increased, and R value constantly reduces, and J value reduces limited；
(2) when aluminium skimmings increase to 50g, L value is continued growing, index J=94.76, L=38.01, R=2.49, shape At sodium metaaluminate supersaturated solution, tank liquor reaches aluminium hydroxide and decomposes precipitation critical point, and R is minimum point 2.49；
(3) when aluminium skimmings increase to 60g, index J=94.76, L=30.59, R=3.10, L value are reduced, hydroxide Aluminium, which decomposes, to be precipitated, and R value is gone up to 3.10；
(4) aluminium skimmings are continued growing, (3) formula is pressed, tank liquor enters Bayer process control interval, and the aluminium of dissolution is continuously generated hydrogen-oxygen Change aluminium, dissolution, release hydrogen, generation hydroxyl and the aluminium hydroxide of aluminium generate, consumption hydroxyl carries out simultaneously, aluminium hydroxide It is precipitated, does not consume free alkali, therefore the reduction of J value is limited；Since tank liquor contains a large amount of aluminium hydroxide crystal seeds, inclined aluminium can be substantially eliminated Sour sodium hypersaturated state, R value continue to rise to stable state, are added within the scope of 80-160 in aluminium skimmings, R value between 3.50-4.00 it Between, it is contemplated that titration error, when R value >=4.00, Sample A absolute stability will not decompose precipitation aluminium hydroxide.
Sample B
(1), index J=199.82, L=0 of slotting presses (1) formula, the oxygen on aluminium skimmings surface with the increase of aluminium skimmings additive amount Change aluminium and consume free alkali, J value gradually reduces；By (2) (5) formula, the dissolution of aluminium discharges hydrogen, generates total alkali, is converted into meta-aluminic acid Sodium does not consume free alkali, and L value is continuously increased, and R value constantly reduces, and J value reduces limited；
(2), when aluminium skimmings increase to 90g, L value is continued growing, index J=199.76, L=68.13, R=2.93, Sodium metaaluminate supersaturated solution is formed, tank liquor reaches aluminium hydroxide and decomposes precipitation critical point, and R is minimum point 2.93；
(3), when aluminium skimmings increase to 100g, index J=193.64, L=68.60, R=2.82, L value is constant, hydrogen-oxygen Change aluminium and decompose precipitation, R value is 2.82；
(4), aluminium skimmings are continued growing, the aluminium oxide on aluminium skimmings surface presses (3) formula, and tank liquor enters Bayer process control interval, dissolves Aluminium be continuously generated aluminium hydroxide, the dissolution of aluminium, release hydrogen generate hydroxyl and aluminium hydroxide generates, to consume hydroxyl same Shi Jinhang, aluminium hydroxide are precipitated, and do not consume free alkali, therefore the reduction of J value is limited；Since tank liquor contains a large amount of aluminium hydroxide crystal seeds, Sodium metaaluminate hypersaturated state can be substantially eliminated, R value continues to rise to stable state, is added within the scope of 120-160 in aluminium skimmings, R value Between 4.00-4.15, it is contemplated that titration error, when R value >=4.20, sample B absolute stability will not decompose precipitation hydrogen-oxygen Change aluminium.
Sample C
(1), index J=313.12, L=0 of slotting presses (1) formula, the oxygen on aluminium skimmings surface with the increase of aluminium skimmings additive amount Change aluminium and consume free alkali, J value gradually reduces；By (2) (5) formula, the dissolution of aluminium discharges hydrogen, generates total alkali, is converted into meta-aluminic acid Sodium does not consume free alkali, and L value is continuously increased, and R value constantly reduces, and J value reduces limited；
(2), when aluminium skimmings increase to 130g, L value is continued growing, index J=276.04, L=92.79, R=2.98, Sodium metaaluminate supersaturated solution is formed, tank liquor reaches aluminium hydroxide and decomposes precipitation critical point, and R is minimum point 2.98；
(3), when aluminium skimmings increase to 140g, index J=273.98, L=93.261, R=2.94, L value change very Small, aluminium hydroxide, which decomposes, to be precipitated, and R value is 2.94；
(4), aluminium skimmings are continued growing, (3) formula is pressed, tank liquor enters Bayer process control interval, and the aluminium of dissolution is continuously generated hydrogen-oxygen Change aluminium, dissolution, release hydrogen, generation hydroxyl and the aluminium hydroxide of aluminium generate, consumption hydroxyl carries out simultaneously, aluminium hydroxide It is precipitated, does not consume free alkali, therefore the reduction of J value is limited；Since tank liquor contains a large amount of aluminium hydroxide crystal seeds, inclined aluminium can be substantially eliminated Sour sodium hypersaturated state, R value continue to rise to stable state, are added within the scope of 120-160 in aluminium skimmings, and R value is between 3.18-3.25 Between；Since tank liquor viscosity is too big, the aluminium hydroxide of decomposition is difficult to precipitate after stirring, and titration error is too big, and aluminium skimmings additive amount > The data of 160g or more can not obtain, and the stable state R value of sample C can not be got.
Analysis of experimental results
(1), Sample A-C exists and decomposes critical point.The decomposition critical point of A is J=94.76, L=38.01, R= 2.49, B decomposition critical point is J=199.76, L=68.13, R=2.93, and the decomposition critical point of C is J=276.04, L= 92.79, R=2.98；Critical point or more is being decomposed, J is slightly reduced, and L is increased, and R is reduced, and tank liquor steps into sodium metaaluminate mistake Saturation interval is precipitated without aluminium hydroxide；
(2), there is decomposition point in Sample A-C.The decomposition point of A is J=94.76, L=30.59, R=3.10, point of B Solution point is J=193.64, L=68.60, R=2.82, and the decomposition point of C is J=273.98, L=93.261, R=2.94, is being divided Hereinafter, J is slightly reduced, L is no longer significantly increased with the addition of aluminium skimmings solution point, and R is no longer added with aluminium skimmings and is greatly reduced, slot Liquid enters Bayer process sodium metaaluminate and decomposes section, decomposes and a large amount of aluminium hydroxides are precipitated.Sample A there are apparent supersaturation, Critical point L=38.01, R=2.49, decomposition point L=30.59, R=3.10, after adding 10g aluminium skimmings, L does not increase not only, instead And be greatly reduced, a large amount of aluminium hydroxides are precipitated, R rebounds to 3.10；Sample B supersaturation is unobvious, critical point L= 68.13, steady excessive between R=2.93 and decomposition point L=68.60, R=2.82, the 10g aluminium skimmings of addition directly resolve into hydrogen Aluminium oxide, L, R have almost no change, and tank liquor is directly entered Bayer process sodium metaaluminate and decomposes section；Sample C supersaturation is not Obviously, steady excessive between critical point L=92.79, R=2.98 and decomposition point L=93.261, R=2.94, the 10g aluminium of addition Bits directly resolve into aluminium hydroxide, and L, R have almost no change, and tank liquor is directly entered Bayer process sodium metaaluminate and decomposes section；
(3), after decomposing section into Bayer process sodium metaaluminate, continue to add aluminium skimmings, L is not further added by, and R is constantly increased.Examination The R value of sample A gradually approaches the section 3.50-4.00, and the R value of sample B gradually approaches the section 4.00-4.15；Except the aluminium skimmings of addition are straight It connects and resolves into outside aluminium hydroxide, the presence of a large amount of aluminium hydroxide crystal seeds further induces sodium metaaluminate to decompose, thoroughly eliminated Saturated phenomenon realizes the dynamic equilibrium of (3) formula chemical reaction；
(4), the index for stewing the mould liquid when of falling slot is J=250, L=50, R=5.00, the closest work for stewing mould liquid of sample B, C Make index.The experimental results showed that stewing the R value that mould liquid decomposes is 3.00 or so under conditions of no crystal seed, pot mould is recycled Aluminium in liquid, it is necessary to decompose and stew mould liquid, add the acid of suitable concentration, consume free alkali, drop low r-value to 3.00 or so, Fang Nengfen Solve aluminium hydroxide；Pipeline is wanted to stew mould liquid, R value has to be larger than 3.00, it is contemplated that the introducing of unexpected crystal seed induces inclined aluminium Sour sodium decomposes, and R value is preferably conveyed 3.50 or more；It wants long term storage to stew mould liquid, does not decompose, do not precipitate, R value is preferably controlled in More than 4.00.
The changing rule of anhydrous sodium sulfate solubility with temperature
Pure water 100ml is taken, since 0 DEG C, adds anhydrous sodium sulfate, record saturation point dissolves anhydrous sodium sulfate weight (g)；Every 10 DEG C, detection is primary, obtains anhydrous sodium sulfate saturated concentration variation with temperature rule, as shown in table 2:
The changing rule of 2 anhydrous sodium sulfate solubility with temperature of table
Analysis of experimental results
(1), the variation of anhydrous sodium sulfate solubility with temperature very greatly, 4.9g/100ml at 0 DEG C, 48.8g/ at 40 DEG C 100ml differs nearly 10 times；
(2), 0-40 DEG C of section, solubility steeply rise；40-100 DEG C, solubility slightly declines；
(3), cooling means can be used, sal glauberi is precipitated in crystallization, by being separated by solid-liquid separation, obtains sal glauberi product； Filtrate sodium sulphate content is greatly reduced.
Oxidation solution and pot mould liquid (Alkaline etchant) neutralize recycling aluminium hydroxide and sodium sulphate experimental result
Qualitative and quantitative analysis.By (6) (7) formula, addition stews mould liquid in sulfuric acid (or oxidation spent acid), and aluminium hydroxide can be recycled And sodium sulphate or aluminum sulfate and sodium sulphate.Aluminium hydroxide is not soluble in water, the separation of aluminium hydroxide and sodium sulphate easy to accomplish；Sulphur Sour aluminium and sodium sulphate are dissolved in water, realize that the two recycling, online separation acquire a certain degree of difficulty, need to consume a large amount of water for cleaning, discharge Into waste water center, sodium ion can pollute in water, hinder Treated sewage reusing.
A, pot mould liquid after taking aging, before discharge, mono- liter of J=253.33, L=51.35, R=4.93, total alkali J is total 12.04 equivalents；The dilute sulfuric acid that concentration is 200g/L is added, equivalent concentration 4.08, completely reaction need to consume dilute to neutrality 2.951 liters of sulfuric acid, 12.04 equivalent of sulfuric acid.Reaction product are as follows: 3.951 liters of reaction solution total volume, contain 5.71 equivalent of aluminium, sulfate radical 12.04 equivalents；12.04 equivalent of sal glauberi is generated, 1938.44g is counted；5.71 equivalent of aluminium hydroxide is generated, 148.46g is counted；
B, just section is reacted.2.951 liters of 200g/L dilute sulfuric acid are taken, addition index is J=253.33, L=51.35, R= 4.93 pot mould liquid, pH value constantly rise；It is the section 4.5-4.89 in pH, reaction product is aluminum sulfate and sulfuric acid by (7) formula Sodium；Using the difference of aluminum sulfate under different temperatures and sodium sulphate solubility, crystallizable both chemical products of separation.It considers Online processing, aluminum material factory's pot mould waste liquid amount is huge, both chemical products yield are huge and are all dissolved in water, cleaning water used Huge, online separating difficulty is too big, and has water discharge, not environmentally, should not generate aluminum sulfate and sodium sulphate online；It can an agllutination Partial crystallization goes out, and is separated by solid-liquid separation, and remains later period recrystallization, separates aluminum sulfate and sodium sulphate；
C, terminal section is reacted.Continue addition and stew mould liquid, when pH is greater than 4.89, tank liquor decomposes, aluminium hydroxide, addition is precipitated It stews mould liquid one and rises to reaction end, between 7.00-7.50, most of sodium metaaluminate decomposes to be precipitated pH；Filtering, rinsing, drying, Obtain the high-purity hydrogen alumina product for meeting national standard；Cooling first-time filtrate is to 5 DEG C hereinafter, using sodium sulphate in low temperature Sodium sulphate is precipitated in the physical characteristic that lower solubility drastically reduces, crystallization, is separated by solid-liquid separation, and rinses, and drying obtains sodium sulphate product；Two Secondary filtrate sends pot die cavity 7 back to and continues to stew mould, realizes and stews the zero-emission of mould waste water and dregs；
D, it is reacted with oxidation solution.Oxidation 2.951 liters of waste liquid (total acid 200g/L, aluminium ion 20/L) is taken, addition stews mould liquid (J =253.33, L=51.35, R=4.93) one rise to reaction end, between 7.00-7.50, sodium metaaluminate decomposes to be precipitated pH；It crosses Filter, rinsing, drying, obtain the high-purity hydrogen alumina product for meeting national standard, are shown in Table 3；Cooling first-time filtrate to 5 DEG C with Under, using the sodium sulphate physical characteristic that solubility drastically reduces at low temperature, sodium sulphate is precipitated in crystallization, it is separated by solid-liquid separation, rinsing, Drying, obtains high-quality sodium sulphate product, is shown in Table 4；Secondary filtrate sends pot die cavity 7 back to and continues to stew mould, realizes and stews mould waste water and dregs zero Discharge；The cooling first-time filtrate of the present invention is to 5 DEG C hereinafter, sodium sulphate, production sodium sulphate product is precipitated in crystallization；Secondary filtrate is sent back to It stews die cavity 7 to continue to stew mould, fully achieves sodium ion and be isolated with waste water center, clear away maximum ion barrier for Treated sewage reusing.
3 oxidation solution of table and stew mould liquid in and produce aluminium hydroxide testing result
4 oxidation solution of table and stew mould liquid in and produce sodium sulphate testing result
Three, oxidation solution neutralizes recycling aluminium hydroxide with pot mould liquid (Alkaline etchant) and sodium sulphate byproduct test result is qualitative Analysis
By test 1-4 and testing result, following analysis can be done:
1, using oxidation waste liquid (or dilute sulfuric acid), addition stews mould liquid or other lye containing sodium metaaluminate and sodium hydroxide (such as alkali lysate of oxidation line Alkaline etchant (being free of additive), aluminium ash, R >=3.5), in pH between 4.50-4.89, Recyclable aluminum sulfate and sodium sulphate byproduct；In pH between 7.00-7.50, aluminium hydroxide and sodium sulphate by-product can be recycled Product；
2, between reaction end pH7.0-7.5, sodium metaaluminate decomposes precipitation completely, generates aluminium hydroxide；Solid-liquid point From, rinsing, drying, can get and meet the high-quality aluminium hydroxide of national standard；
3, cooling first-time filtrate to temperature is not higher than 5 DEG C, and sodium sulphate is precipitated in mass crystallization；It is separated by solid-liquid separation, drying can obtain The high-quality sodium sulphate of national standard must be met；
4, containing the secondary filtrate of a small amount of sodium sulphate, can send back to and stew die cavity 7 and be recycled, waiting is recycled next time, all every Sodium ion from waste water center is realized and stews the waste residue zero-emission of mould plant effluent.
The technical principle of the invention is described above in combination with a specific embodiment.These descriptions are intended merely to explain the present invention Principle, and shall not be construed in any way as a limitation of the scope of protection of the invention.Based on the explanation herein, this field Technical staff can associate with other specific embodiments of the invention without creative labor, these modes are all It will fall under the scope of the present invention.

Claims (10)

1. stewing the oxidation line configuration of mould liquid recycling aluminium hydroxide and sodium sulphate characterized by comprising secondary filtrate collecting pit, Stew mould liquid waste treatment system, raw material liquid waste treatment system, reaction liquid treating system and first-time filtrate collection system；
Pot mould liquid waste treatment system includes: No. six pumps, stews die cavity, waste water curb, stews mould liquid collecting tank；
The secondary filtrate collecting pit, No. six pumps stew die cavity, waste water the curb company of being sequentially communicated adjacent with mould liquid collecting tank is stewed It connects；High-pressure atomization hydraulic giant is equipped in the waste water curb；The high-pressure atomization hydraulic giant is connected with No. six pumps；It is described Stew pot mould that die cavity is used for aluminium；
The Waste alkaline solution processing system includes: that Waste alkaline solution generates system and Waste alkaline solution collection system；The Waste alkaline solution Generation system includes: alkaline etching slot, the first Alkaline etchant entrapping tank, the second Alkaline etchant entrapping tank, Alkaline etchant collecting tank, No. seven pumps, eight Number pump and No. nine pump；The Waste alkaline solution collection system includes: degreasing tank, flowing rinsing bowl, high-pressure atomization spray groove, neutralizes Slot, spray liquid collecting tank；
The degreasing tank, flowing rinsing bowl, alkaline etching slot, the first Alkaline etchant entrapping tank, the second Alkaline etchant entrapping tank, high-pressure atomization spray Leaching slot and neutralization chamber are sequentially connected；Pot mould liquid collecting tank, No. seven pumps and alkaline etching slot are sequentially connected；Second Alkaline etchant is cut Slot, No. nine pumps and secondary filtrate collecting pit is stayed to be sequentially connected；The first Alkaline etchant entrapping tank, No. eight pumps and the Alkaline etchant are received Collection tank is sequentially connected；The high-pressure atomization spray groove and flowing rinsing bowl are connected to water inlet respectively；The high-pressure atomization spray groove, Spray liquid collecting tank, No. nine pumps and the second Alkaline etchant entrapping tank are sequentially communicated connection, and No. nine pumps are also connected with described secondary Filtrate collecting pit；
It is pumped by described No. seven, pot mould liquid in the waste water curb is successively by stewing mould liquid collecting tank and alkaline etching slot；It is described Degreasing tank and flowing rinsing bowl are respectively used to processing aluminium；The alkaline etching slot is used to handle pot mould for stewing mould liquid collecting tank Liquid, and treated the aluminium of degreasing tank and circulating water described in alkaline etching, generate Waste alkaline solution；The first Alkaline etchant entrapping tank and Two Alkaline etchant entrapping tanks treated for cleaning alkaline etching slot aluminium；The high-pressure atomization spray groove is for spraying the alkali Lose aluminium after slot is handled；The neutralization chamber is used for aluminium after neutralisation treatment；The Alkaline etchant collecting tank is for collecting described first The Waste alkaline solution of Alkaline etchant entrapping tank, and Waste alkaline solution is reached into the reaction liquid treating system；
The reaction liquid treating system, filtrate collection system and first-time filtrate separation system are sequentially communicated connection；
The reaction liquid treating system receives the Waste alkaline solution of the Alkaline etchant collecting tank, and oxidation waste liquid is added and is mixed with simultaneously Reaction, then aluminium hydroxide and first-time filtrate are being isolated by the filtrate collection system, by the first-time filtrate separation system First-time filtrate is isolated into sodium sulphate；
The second Alkaline etchant entrapping tank, spray liquid collecting tank and high-pressure atomization spray groove are sequentially connected, and the spray liquid is collected The connecting line of tank and the second Alkaline etchant entrapping tank be equipped with No. nine pump, the spray liquid collecting tank, No. nine pump and it is secondary Filtrate collecting pit is sequentially connected, and the secondary filtrate collecting pit is also used to collect the second Alkaline etchant entrapping tank and high-pressure atomization The Waste alkaline solution of spray groove.
2. the oxidation line configuration according to claim 1 for stewing mould liquid recycling aluminium hydroxide and sodium sulphate, which is characterized in that institute It states pot mould liquid collecting tank and passes through pot mould waste liquid after thering is sodium hydroxide to react with aluminium-making mould；
When by pot mould liquid collecting tank, ratio is between the free alkali concentration and aluminum ions concentration for stewing mould waste liquid 3.8-4.2；
When by the alkaline etching slot, ratio is 3.5-4.0 between the free alkali concentration and aluminum ions concentration for stewing mould waste liquid.
3. the oxidation line configuration according to claim 2 for stewing mould liquid recycling aluminium hydroxide and sodium sulphate, which is characterized in that institute Stating reaction liquid treating system includes: reaction solution add-on system and reaction liquid separation system；
The reaction solution add-on system includes: oxidation solution collecting tank, reactor tank, No.1 pump and No. two pumps；The oxidation solution is collected Tank, No.1 pump and reactor tank are sequentially communicated connection respectively, pump the oxidation waste liquid of the oxidation solution collecting tank by the No.1 It is transferred to the reactor tank；The reactor tank and the Alkaline etchant collecting tank are connected with No. two pumps, make No. two pumps will The Waste alkaline solution of the Alkaline etchant collecting tank reaches in the reactor tank；
The reaction liquid separation system includes: to be separated by solid-liquid separation tank, the first centrifuge, the first filtrate recycling can and No. three pumps；It is described It is separated by solid-liquid separation tank, first centrifuge, the first filtrate recycling can and No. three pumps and adjacent is sequentially communicated connection；
The upper layer of the reactor tank, No. two pumps and the first filtrate recycling can are sequentially communicated connection, and No. two pumps are used for will be described The first-time filtrate of first filtrate recycling can is transmitted to the reactor tank；
The upper end for being separated by solid-liquid separation tank, the first filtrate recycling can and No. two pumps and the reactor tank are connected respectively；
The first filtrate recycling pot bottom and middle part are respectively equipped with the pipeline for leading to No. three pumps, and respectively by ten No. nine valves It is controlled with ten No. eight valves；No. three pumps are also connected with the reactor tank；
First centrifuge is used to isolate gasification sodium between 7.00-7.50 in pH, and by liquid guide flow to described first Filtrate recycling can；No. three pumps are connected with the first-time filtrate separation system, make primary in the first filtrate recycling can After filtrate reaches the first-time filtrate separation system, separated to go out between 7.00-7.50 in pH by the first-time filtrate separation system Sodium sulphate.
4. the oxidation line configuration according to claim 3 for stewing mould liquid recycling aluminium hydroxide and sodium sulphate, which is characterized in that institute The quantity for stating reactor tank is 2；Respectively at the bottom at the middle part of the two side wall, lower part and the reactor tank between the reactor tank It is connected, and is commonly connected to No. two pumps；
No. two pumps are in the upper layer for connecting the reactor tank, and connecting line is in the inlet of one of them reactor tank Equipped with ten No. three valves, ten No. four valves are equipped in the inlet of another reactor tank；
One of them described reactor tank is equipped with No. three valves in the exit at middle part, is equipped with No. five valves in the exit of lower part, and should The bottom of reactor tank is equipped with No. seven valves；Another reactor tank is equipped with No. four valves in the exit at middle part, sets in the exit of lower part There are No. six valves, and the bottom of the reactor tank is equipped with No. eight valves；The reactor tank is commonly connected to the connecting line of No. two pumps It is equipped with No. nine valves；
No.1 pump is connected to the top of the reactor tank, and in being respectively equipped with No.1 valve on the pipeline of connection.
5. the oxidation line configuration according to claim 4 for stewing mould liquid recycling aluminium hydroxide and sodium sulphate, which is characterized in that institute Stating filtrate collection system includes: sulfate crystal tank, No. four pumps, the second centrifuge, the second filtrate recycling can and No. five pumps；It is described No. three pumps, sulfate crystal tank, No. four pumps, second centrifuge, the second filtrate recycling can and No. five pumps It is adjacent to be sequentially communicated connection；No. three pumps access in the sulfate crystal tank；No. five pumps are connected in described two Secondary filtrate collecting pit；
Ice maker is equipped in the sulfate crystal tank；Second centrifuge is for isolating sodium sulphate.
6. the oxidation line configuration according to claim 2 for stewing mould liquid recycling aluminium hydroxide and sodium sulphate, which is characterized in that institute It states to stew and is equipped with several pot mold containers in die cavity；The entrance for stewing mold container is connected with No. six pumps respectively, and described pot The entrance of mold container is equipped with 40 No. four valves；The outlet for stewing mold container is connect with the waste water curb, and pot mould The outlet of container is equipped with 30 No. two valves；
The connecting line of the secondary filtrate collecting pit and No. six pumps is equipped with 20 No. nine valves；It is described No. six pump and it is described The connecting line for stewing die cavity is equipped with three No. ten valves；The connecting line of the high-pressure atomization hydraulic giant and No. six pumps is equipped with 31 Number valve；
No. seven pumps and the connecting line for stewing mould liquid collecting tank are equipped with 50 No. six valves；The first Alkaline etchant entrapping tank is to institute It states alkaline etching slot and is equipped with 50 No. seven unidirectional valves；The second Alkaline etchant entrapping tank is equipped with single to the first Alkaline etchant entrapping tank To 50 No. eight valves；The connecting line of the first Alkaline etchant entrapping tank and No. eight pumps is equipped with 50 No. nine valves；It is described The connecting line of second Alkaline etchant entrapping tank and No. nine pumps is equipped with 60 No. two valves；Described No. ten pumps and the water inlet Connecting line is equipped with six No. ten valves；The connecting line of the high-pressure atomization spray groove and the high-pressure atomization spray groove is equipped with 60 No.1 valve；The connecting line of No. nine pumps and the secondary filtrate collecting pit is equipped with 60 No. three valves；
The connecting line of the oxidation solution collecting tank and No.1 pump is equipped with 20 No. two valves；The Alkaline etchant collecting tank connection In the reactor tank and No. two pumps connecting line, and No. ten are equipped between the connecting line and the Alkaline etchant collecting tank Valve；No. two pumps are also attached to through the reactor tank top, and the connecting line is equipped with ride on Bus No. 11 valve；
No. two pumps are equipped with ten No. six valves with the connecting line for being separated by solid-liquid separation tank；In the first filtrate recycling can and institute On the connecting line for stating No. two pumps, the inlet of the first filtrate recycling can is equipped with ten No. five valves, the outlet of No. two pumps Place is equipped with ten No. two valves；The outlet port for being separated by solid-liquid separation tank is equipped with ten No. seven valves；
The connecting line of No. three pumps and sulfate crystal tank is equipped with two No. ten valves；The company of No. three pumps and the reactor tank It takes over road and is equipped with two ride on Bus No. 11 valves；The connecting line of No. four pumps and the sulfate crystal tank is equipped with 20 No. five valves；Institute The connecting line for stating No. four pumps and the second centrifuge is equipped with 20 No. six valves；The connection of the second filtrate recycling can and No. five pumps Pipeline is equipped with 20 No. seven valves；The connecting line of the secondary filtrate collecting pit and No. five pumps is equipped with 20 No. eight valves.
7. the oxidation line configuration according to claim 6 for stewing mould liquid recycling aluminium hydroxide and sodium sulphate, which is characterized in that institute The side for stating reactor tank is equipped with anti-overflow lip；The anti-overflow lip is set to position between the top and middle part of the reaction pot sidewall；Institute The first filtrate recycling can is stated to connect with the anti-overflow lip by pipeline respectively；
The reactor tank is separated by solid-liquid separation in tank, filtrate recycling can and sulfate crystal tank equipped with blender.
8. using the technique of the oxidation line configuration for stewing mould liquid recycling aluminium hydroxide and sodium sulphate as claimed in claim 6, feature It is, comprising the following steps:
(1) it stews mould devil liquor recovery: closing each valve and pump in pot die cavity；And open 20 No. nine valves, three No. ten valves With 30 No. two valves, starts No. six pumps, filled the water for pot die cavity；It is pot mould by the sodium hydroxide of 150-250g/L Slot fluting；Mold is hung in into pot die cavity and makees pot modulo operation；Mold is hung out after the completion of stewing modulo operation, opens described 31 Number valve starts No. six pumps, cleans mold with the high-pressure atomization hydraulic giant, mold dries recycling；The water for cleaning mold is led It flow to pot mould liquid collecting tank recycling；When pot mould liquid aluminium ion reaches 60g/L or more, mould waste liquid will be stewed and be guided to described pot Mould liquid collecting tank；The liquid alkaline that mass fraction is 50% is added, the ratio for stewing free alkali concentration and aluminium ion concentration in mould waste liquid is made It is adjusted between 3.8-4.2；50 No. six valves are opened, starts No. seven pumps, mould waste liquid will be stewed as Alkaline etchant and be pumped into institute State alkaline etching slot；
(2) Waste alkaline solution generates: detecting the alkaline etching slot of Alkaline etchant, addition sodium hydroxide keeps free alkali concentration and aluminium ion dense The Ratio control of degree is to 3.5-4.0；
Aluminium after oil removing in 2-5 minutes, cleans 60-120s, drip 30s through the flowing rinsing bowl, then in the degreasing tank Into the alkaline etching slot 74；At 50-60 DEG C, alkaline etching 5-15 minutes；Again through the first Alkaline etchant entrapping tank and the second Alkaline etchant Entrapping tank cleans 60s, drip 30s；60s is sprayed through the high-pressure atomization spray groove, into neutralization chamber, it is raw to complete Waste alkaline solution At；
(3) Waste alkaline solution is collected: being opened described No. ten valves, is started No. eight pumps, the first Alkaline etchant entrapping tank is retained Waste alkaline solution be sent into the Alkaline etchant collecting tank；No. nine pumps are opened, the spray liquid that the spray liquid collecting tank is collected is pumped into The second Alkaline etchant entrapping tank reversely flows back to the first Alkaline etchant retention through 60 No. two valves, 50 No. eight valves Slot；
(4) it aoxidizes waste collection: opening the No.1 valve, 20 No. two valves, start the No.1 pump, the oxidation solution is collected Oxidation waste liquid in tank is pumped into the reactor tank；
(5) Waste alkaline solution adds: according to Waste alkaline solution titration oxidation waste liquid as a result, the body of addition Waste alkaline solution needed for estimation Product；
No. three valves, No. four valves, No. five valves, No. six valves, No. eight valves, ten No. two valves and ten No. four valves are closed, open described seven Number valve, No. nine valves, ride on Bus No. 11 valve, ten No. three valves start No. two pumps, recycle the oxidation waste liquid of one of reactor tank；Or Close No. three valves, No. four valves, No. five valves, No. six valves, No. seven valves, ten No. two valves and ten No. three valves, open No. eight valves, No. nine valves, ride on Bus No. 11 valve, ten No. four valves start No. two pumps, recycle the oxidation waste liquid of another reactor tank；
Described No. ten valves are opened, using negative pressure, Waste alkaline solution sucking described No. two in the Alkaline etchant collecting tank is pumped and is sent Enter the reactor tank, neutralizes oxidation waste liquid；Addition Waste alkaline solution, in 7.0-7.5, reaches reaction end to reacting liquid pH value, raw At aluminium hydroxide and sodium sulphate；Described No. ten valves are closed, addition Waste alkaline solution is stopped；Continue stirring 30 minutes, stands 60 minutes；
(6) No. four valves, No. six valves, No. seven valves, No. eight valves, No. ten valves, ride on Bus No. 11 valve, ten reaction solution lock out operation: are closed No. six valves；No. three valves or No. five valves are opened, No. nine valves, ten No. two valves and ten No. five valves are opened, start described No. two Pump, is pumped into the first filtrate recycling can for the supernatant in the reactor tank；Close No. three valves, No. five valves, ten No. five Valve and ten No. seven valves open No. seven valves and ten No. six valves, start No. two pumps, the solidliquid mixture in the reactor tank is pumped Enter the separation of solid and liquid tank under stirring, start first centrifuge, open ten No. seven valves, after being separated by solid-liquid separation and spraying Isolate aluminium hydroxide and first-time filtrate；First-time filtrate is sent into the first filtrate recycling can；
Or close No. three valves, No. five valves, No. seven valves, No. eight valves, No. ten valves, ride on Bus No. 11 valve, ten No. six valves；Open described four Number valve or No. six valves and No. nine valves, ten No. two valves and ten No. five valves start No. two pumps, will be in the reactor tank Supernatant be pumped into the first filtrate recycling can；No. four valves, No. six valves, ten No. five valves and ten No. seven valves are closed, are opened No. eight valves and ten No. six valves start No. two pumps, the institute solidliquid mixture in the reactor tank being pumped under stirring Separation of solid and liquid tank is stated, first centrifuge is started, opens ten No. seven valves, be separated by solid-liquid separation and isolates hydroxide after spraying Aluminium and first-time filtrate；Filtrate is sent into the first filtrate recycling can；
(7) first-time filtrate is collected and is recycled: closing ten No. five valves, ten No. eight valves, ten No. nine valves, two No. ten valves and 21 Number valve collects first-time filtrate in the first filtrate recycling can, completes first-time filtrate and collects；Close ten No. nine valves and two Ride on Bus No. 11 valve opens ten No. eight valves and two No. ten valves, opens No. three pumps, will be upper in the filtrate recycling can Clear liquid is pumped into the sulfate crystal tank；It opens ten No. nine valves and two ride on Bus No. 11 valves, closes ten No. eight valves and described Two No. ten valves open No. three pumps, sediment in the first filtrate recycling can under stirring are pumped into reactor tank, Secondary recovery is carried out, first-time filtrate recycling is completed；
(8) sodium sulphate recycles: closing 20 No. five valves, opens the ice maker, cooling first-time filtrate is to DEG C hereinafter, sodium sulphate It crystallizes and is precipitated；Electricity stirring is opened, 20 No. five valves and 20 No. six valves are opened, opens second centrifuge, starting No. four pumps, solid-liquid separation sodium sulphate；Filtrate flows into the second filtrate recycling can, completes sodium sulphate recovery system operation stream Journey；
(9) secondary filtrate is collected: being closed 20 No. seven valves, is collected secondary filtrate；Open 20 No. seven valves and 20 No. eight valves open No. five pumps, secondary filtrate are sent into the secondary filtrate collecting pit.
9. the technique of the oxidation line configuration according to claim 8 for stewing mould liquid recycling aluminium hydroxide and sodium sulphate, feature It is, in step (3), when the second Alkaline etchant entrapping tank cannot refill spray liquid, opens 60 No. three valves, starting described nine Number pump, extra spray liquid is pumped into the secondary filtrate collecting pit.
10. the technique of the oxidation line configuration according to claim 8 for stewing mould liquid recycling aluminium hydroxide and sodium sulphate, feature It is, the No.1 pump is connected to the upper end of the reactor tank, receives the pump of No.1 described in the step (4) by the oxidation solution Oxidation waste liquid in collection tank is injected from the reactor tank upper end；
Described No. two pump the upper end for being connected to the reactor tank, receive No. two pumps described in the step (5) by the Alkaline etchant Alkaline etchant in collection tank is injected from the reactor tank upper end.
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