CN109824193A - Alumina chemical industry Waste acid recovery technology - Google Patents
Alumina chemical industry Waste acid recovery technology Download PDFInfo
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- CN109824193A CN109824193A CN201910102832.7A CN201910102832A CN109824193A CN 109824193 A CN109824193 A CN 109824193A CN 201910102832 A CN201910102832 A CN 201910102832A CN 109824193 A CN109824193 A CN 109824193A
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- acid
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Abstract
The present invention provides a kind of alumina chemical industry Waste acid recovery technology, includes the following steps: that (1) waste water stoste to be processed is handled by ceramic membrane filter, obtains clear liquid；(2) clear liquid that step (1) obtains is concentrated using pressure reducing film distillation；(3) concentrate obtained by step (2) is purified through resin adsorption, and absorption retains phosphoric acid and sulfuric acid, isolates heavy metal ion；(4) scavenging solution that step (3) obtains carries out high temperature evaporation concentration, the acid solution after being concentrated.Disposed of in its entirety of the present invention is at low cost, wherein ceramic membrane can remove the impurity such as macromolecular substances, the grease in waste water, resin can be by the separation of heavy metal ions such as acid and aluminium, copper, iron, phosphoric acid concentration further through the finally obtained phosphoric acid liquid of high temperature evaporation can achieve 85%, it can directly recycle for producing, therefore waste acid treatment technique input-output ratio of the invention is high, and benefit is good, realizes the energy-saving and emission-reduction of alumina industry spent acid and circular economy processing intent on the whole.
Description
Technical field
The present invention relates to wastewater recovery processing techniques, and in particular to alumina chemical industry Waste acid recovery technology.
Background technique
Aluminium oxygen installation will use two sour (concentrated phosphoric acid and the concentrated sulfuric acids), the proportion of phosphoric acid and sulfuric acid is each when electricity throws technique
Enterprise can difference, but electricity throw after require to carry out pickling process, acidity and total phosphorus in the cleaning waste water which generates
Concentration is all very high, is immediately discharged in sewage disposal system, can there is many drawbacks: 1) increasing sewage operations people intensity and difficulty；
2) total phosphorus is not easy stably reaching standard；3) liquid alkaline and lime usage amount are big；4) sludge quantity generated is big；5) processing cost is high；6) with
The energy-saving and emission-reduction and circular economy advocated energetically run in the opposite direction.
Summary of the invention
In order to solve the above technical problems, the present invention provides, a kind of processing cost is low, and waste acid recycling works well
Waste acid treatment technique.
The technical solution of the present invention is to provide a kind of alumina chemical industry Waste acid recovery technologies, include the following steps:
(1) waste water stoste to be processed is handled by ceramic membrane filter, obtains clear liquid；
(2) clear liquid that step (1) obtains is concentrated using pressure reducing film distillation；
(3) concentrate obtained by step (2) is purified through resin adsorption, and absorption retains phosphoric acid and sulfuric acid, isolate heavy metal from
Son；
(4) scavenging solution that step (3) obtains carries out high temperature evaporation concentration, the acid solution after being concentrated.
Pressure reducing film distillation uses polytetrafluoroethylene (PTFE) (PTFE) or tetrafluoroethene (PVDF) partially for hydrophobic membrane in above-mentioned steps (2)
Filter medium, the flow passage components in pressure reducing film distillation equipment use non-metallic material, to highrank fuel salinity water and Cl-With preferable resistance to
Corrosivity, while on-line cleaning can be carried out, it works without complicated later maintenance, the flux recovery rate for cleaning caudacoria can reach
99%.Pressure reducing film distillation technology is low temperature concentration technique, only needs 80-90 DEG C of hot water as heat source, i.e., steams using film two sides
Steam pressure difference reaches waste water into fluidized state in low temperature environment, utmostly mentions as mass transfer driving force
The diffusion rate of high water vapour.
In above-mentioned steps (2), evaporation liquid can directly substitute soft water for resin purification or be directly discharged into waste water station, carry out useless
Discharge after water process is up to standard.
Above-mentioned steps (2) (3) repeat 1 to 3 time, i.e. clear liquid is net through resin adsorption through pressure reducing film distillation concentration → concentrate
Change, then purifies the concentrate pressure reducing film distillation after adsorption cleaning → second of concentrate through resin adsorption second, so
Repetitive cycling finally obtains the acid recovery liquid for meeting demand.
It is regenerated in above-mentioned steps (3) after resin saturation with pure water or soft water, it is wherein sour in scavenging solution to be purified liquid
Concentration is identical as the acid concentration holding in waste water stoste to be processed, is conducive to obtain phosphoric acid subsequently through high temperature evaporation concentration
Liquid.
The advantages of the present invention: the present invention couples phosphoric acid by ceramic membrane, ionic adsorption purification, embrane method thermal method
Recovery system, disposed of in its entirety is at low cost, and wherein ceramic membrane can remove the impurity such as macromolecular substances, the grease in waste water, resin energy
Enough by the separation of heavy metal ions such as acid and aluminium, copper, iron, the phosphoric acid concentration further through the finally obtained phosphoric acid liquid of high temperature evaporation can
It to reach 85%, can directly recycle for producing, therefore waste acid treatment technique input-output ratio of the invention is high, benefit is good,
The energy-saving and emission-reduction of alumina industry spent acid and circular economy processing intent are realized on the whole.
Detailed description of the invention
Fig. 1 is the processing flow schematic diagram of Waste acid recovery technology.
Specific embodiment
The invention will be further described With reference to embodiment.
Embodiment
Spent acid stoste source handled by the present embodiment are as follows: the proportion (mass ratio) that electricity throws two acid in technique is 85% phosphorus
Acid: 98% sulfuric acid=87%:13%；Waste acid treatment amount is 100 ton/days, and wherein the phosphoric acid concentration of spent acid is 2.5%, aluminium ion
Concentration is~10g/L, sulfuric acid concentration 0.374%.
The present invention provides a kind of alumina chemical industry Waste acid recovery technology, handles above-mentioned spent acid, includes the following steps:
(1) waste water stoste to be processed is handled by ceramic membrane filter, obtains clear liquid；
(2) clear liquid that step (1) obtains is concentrated using pressure reducing film distillation；Wherein using polytetrafluoroethylene (PTFE) (PTFE) or
Inclined tetrafluoroethene (PVDF) is hydrophobic membrane filter media, and the flow passage components in pressure reducing film distillation equipment use non-metallic material, right
Highrank fuel salinity water and Cl-With preferable corrosion resistance, while on-line cleaning can be carried out, worked without complicated later maintenance, clearly
The flux recovery rate for washing caudacoria can reach 99%；Concentrate and evaporation liquid are obtained after concentration, wherein concentrate enters rear end process,
And utilization rate of the soft water for subsequent resin purification raising water resource can directly be substituted by evaporating liquid, or be directly discharged into waste water station, into
Discharge after row wastewater treatment is up to standard；
(3) concentrate obtained by step (2) is purified through resin adsorption, and the present embodiment resin isA-853E type acid returns
Resin is received, phosphoric acid and sulfuric acid can be adsorbed, and isolate the heavy metal ion such as aluminium, copper, iron and be allowed to flow out resin adsorption equipment；Tree
With pure water or soft water (the resulting evaporation liquid replacement of available step (2)) regeneration, to be purified liquid, wherein scavenging solution after rouge saturation
The concentration of middle acid is identical as the acid concentration holding in waste water stoste to be processed, is conducive to obtain subsequently through high temperature evaporation concentration
It is expected that the acid solution of concentration, in order to reach this purpose while guarantee that equipment operational excellence repeats resin adsorption and purifies 1 to 3 time；
(4) step (3) obtains scavenging solution carries out high temperature evaporation concentration, the acid solution after being concentrated, in the acid solution
Based on phosphorus acid content.
Above-mentioned steps (2) (3) repeat 1 to 3 time, i.e. clear liquid is net through resin adsorption through pressure reducing film distillation concentration → concentrate
Change, then purifies the concentrate pressure reducing film distillation after adsorption cleaning → second of concentrate through resin adsorption second, so
Repetitive cycling finally obtains the acid recovery liquid for meeting demand.Comprehensively consider processing cost and treatment effeciency, treatment effect simultaneously,
Number of processes is at most preferred with 3 times.Shown in the process of the present embodiment as shown in figure 1, step (2) (3) is repeated twice, and is repeated every time
Resin purification treatment process is 1 to 3 time repeatable.
Above-mentioned treatment process is detected, as a result as shown in the table:
As can be seen from the above table, waste acidity recovery treatment process through the invention, alumina chemical industry spent acid stoste
Middle aluminium ion concentration is 10g/L, and aluminium ion concentration is 0.87g/L after the completion of processing, and concentration substantially reduces, and phosphoric acid concentration can be from
2.5% in stoste is promoted to that treated 85%, and sulfuric acid can be promoted to 7.34% from 0.374% in stoste, significantly dense
Contracted acid-spending strength, and especially phosphoric acid concentration can achieve 85%, and acid solution is directly recycled for producing such that treated,
The time being further processed and cost are saved, recycling benefit is improved, is conducive to that alumina chemical industry enterprise is pushed to play an active part in
Waste water recycling device, and improve the enthusiasm of returned enterprise.Furthermore the whole waste water for draining into Sewage Disposal
The present embodiments relate to the material arrived, reagent and experimental facilities, are to meet Sewage treatment unless otherwise instructed
The commercial product of process field.
The above is merely a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, under the premise of not departing from core of the invention technology, improvements and modifications can also be made, these improvements and modifications are also answered
Belong to scope of patent protection of the invention.With any change in the comparable meaning and scope of claims of the present invention, all
It is considered as being included within the scope of the claims.
Claims (6)
1. alumina chemical industry Waste acid recovery technology, which comprises the steps of:
(1) waste water stoste to be processed is handled by ceramic membrane filter, obtains clear liquid；
(2) clear liquid that step (1) obtains is concentrated using pressure reducing film distillation；
(3) concentrate obtained by step (2) is purified through resin adsorption, and absorption retains phosphoric acid and sulfuric acid, isolates heavy metal ion；
(4) scavenging solution that step (3) obtains carries out high temperature evaporation concentration, the acid solution after being concentrated.
2. alumina chemical industry Waste acid recovery technology as described in claim 1, which is characterized in that pressure reducing film distillation uses polytetrafluoro
Ethylene or inclined tetrafluoroethene are hydrophobic membrane filter media, and the flow passage components in pressure reducing film distillation equipment use non-metallic material.
3. alumina chemical industry Waste acid recovery technology as described in claim 1, which is characterized in that evaporate liquid in the step (2)
It substitutes soft water and is used for resin purification, or be directly discharged into waste water station, discharged after wastewater treatment is up to standard.
4. alumina chemical industry Waste acid recovery technology as described in claim 1, which is characterized in that the mistake of the resin adsorption purification
Cheng Chongfu 1 to 3 time.
5. alumina chemical industry Waste acid recovery technology as described in claim 1, which is characterized in that the step (2) (3) repeats 1
To 3 times.
6. alumina chemical industry Waste acid recovery technology as described in claim 1, which is characterized in that resin is full in the step (3)
It is regenerated with after with pure water or soft water, the acid to be purified liquid, in the scavenging solution in sour concentration and waste water stoste to be processed
Concentration keeps identical.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910102832.7A CN109824193A (en) | 2019-02-01 | 2019-02-01 | Alumina chemical industry Waste acid recovery technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910102832.7A CN109824193A (en) | 2019-02-01 | 2019-02-01 | Alumina chemical industry Waste acid recovery technology |
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| CN109824193A true CN109824193A (en) | 2019-05-31 |
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| CN201910102832.7A Pending CN109824193A (en) | 2019-02-01 | 2019-02-01 | Alumina chemical industry Waste acid recovery technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110498402A (en) * | 2019-09-25 | 2019-11-26 | 龚典局 | A kind of phosphorous spent acid method of comprehensive utilization |
| CN112279440A (en) * | 2020-05-27 | 2021-01-29 | 江苏国瑞科技有限公司 | Recycling process of waste acid |
| CN113816550A (en) * | 2021-09-01 | 2021-12-21 | 深圳市世清环保科技有限公司 | Method for recycling water washing acid after anodic oxidation chemical polishing |
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| CN106745887A (en) * | 2016-12-20 | 2017-05-31 | 攀枝花市精研科技有限公司 | Industrial waste acid removal of impurities recovery process |
| CN108751557A (en) * | 2018-07-04 | 2018-11-06 | 广东益诺欧环保股份有限公司 | A kind of waste acid resource recovery method and system |
| CN109133460A (en) * | 2017-06-27 | 2019-01-04 | 宝山钢铁股份有限公司 | A kind of resource recycle method of flushing waste water containing chromium |
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2019
- 2019-02-01 CN CN201910102832.7A patent/CN109824193A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106745887A (en) * | 2016-12-20 | 2017-05-31 | 攀枝花市精研科技有限公司 | Industrial waste acid removal of impurities recovery process |
| CN109133460A (en) * | 2017-06-27 | 2019-01-04 | 宝山钢铁股份有限公司 | A kind of resource recycle method of flushing waste water containing chromium |
| CN108751557A (en) * | 2018-07-04 | 2018-11-06 | 广东益诺欧环保股份有限公司 | A kind of waste acid resource recovery method and system |
Non-Patent Citations (1)
| Title |
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| 熊道陵等: "《电镀污泥中有价金属提取技术》", 31 October 2013 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110498402A (en) * | 2019-09-25 | 2019-11-26 | 龚典局 | A kind of phosphorous spent acid method of comprehensive utilization |
| CN112279440A (en) * | 2020-05-27 | 2021-01-29 | 江苏国瑞科技有限公司 | Recycling process of waste acid |
| CN112279440B (en) * | 2020-05-27 | 2022-10-25 | 江苏国瑞科技有限公司 | Recycling process of waste acid |
| CN113816550A (en) * | 2021-09-01 | 2021-12-21 | 深圳市世清环保科技有限公司 | Method for recycling water washing acid after anodic oxidation chemical polishing |
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