CN106277474A - The process recovery method of a kind of steel industry sulfuric acid pickling waste liquid and system thereof - Google Patents

The process recovery method of a kind of steel industry sulfuric acid pickling waste liquid and system thereof Download PDF

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Publication number
CN106277474A
CN106277474A CN201610869341.1A CN201610869341A CN106277474A CN 106277474 A CN106277474 A CN 106277474A CN 201610869341 A CN201610869341 A CN 201610869341A CN 106277474 A CN106277474 A CN 106277474A
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China
Prior art keywords
pipeline
sulfuric acid
valve
reaction member
bipolar membrane
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CN201610869341.1A
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Chinese (zh)
Inventor
李雨桐
邹锦元
杨增强
张传浩
李宁
穆冠宁
张东晓
贾跃武
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Liaoning Zhong Cheng Yong Xu Hydraulic Technology Co Ltd
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Liaoning Zhong Cheng Yong Xu Hydraulic Technology Co Ltd
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Priority to CN201610869341.1A priority Critical patent/CN106277474A/en
Publication of CN106277474A publication Critical patent/CN106277474A/en
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C23COATING 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
    • C23GCLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/36Regeneration of waste pickling liquors
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/66Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/16Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00Controlling or monitoring parameters in water treatment
    • C02F2209/06Controlling or monitoring parameters in water treatment pH
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/08Multistage treatments, e.g. repetition of the same process step under different conditions

Abstract

The process recovery method of a kind of steel industry sulfuric acid pickling waste liquid and system thereof, be used for steel and iron industry pickling lines by the acid solution that bipolar membrane electrodialysis equipment prepares and be used for pickling steel, save cost of material;And utilize the alkali liquor of bipolar membrane electrodialysis equipment to go to process sulfuric acid waste.And use the mode of reaction water tank bottom aeration to make reactant liquor be more fully mixed, and the oxygen of abundance is constantly provided in mixed solution, it is greatly shortened the response time.And with bag filter, mixed solution after reaction is filtered, supernatant and precipitate are carried out solid-liquid separation.After reaction, the sulfate radical in sulfuric acid waste is replaced out, the Fe in sulfuric acid waste2+Form Precipitation.Supernatant after being filtered by bag filter can return to bipolar membrane electrodialysis equipment antacid alkaline again, greatly reduces raw material input cost.Precipitate can reclaim outer selling after drying.It is thus possible to realize the zero-emission of sulfuric acid waste.

Description

The process recovery method of a kind of steel industry sulfuric acid pickling waste liquid and system thereof
Technical field
The invention belongs to technical field of sewage, be specifically related to the process recovery method of a kind of steel industry sulfuric acid waste And system.
Background technology
Before the plating of steel production process and spraying production unit, the iron scale of outer surface should be disposed.Remove at present The mode of iron scale, basic use pickling technology, the acid solution that concentration is bigger carries out pickling processes to steel.So-called useless Acid solution refers to that in pickle, the concentration of acid reduces after overpickling, and the content of iron salt increases, so that pickling ability can not meet Speed of production and the pickle of prescription, still contain the acid about 5% mass ratio, also contain 20% ~ 24% in solution at this moment Iron salt (FeSO4), due to serious corrosivity, it is put into " National Hazard refuse register ".If this acid pickle is not carried out Processing, enter sewer or be discharged to neighbouring receiving water body the most outward, residual acid can corrode cement and concrete and periphery soil, and Destroying the calcium carbonate balance in water body, and make animal dead in water, be harmful to crops, such waste liquid directly discharges the most serious Pollute surrounding enviroment, violate country's " Law on Environmental Protection ", and cause significant wastage.
The processing method of steel and iron industry sulfuric acid waste mainly has neutralisation, sulphate of iron method, dialysis, life the most both at home and abroad The methods such as thing method.
Neutralisation: typically use Calx, carbide slag or Caustic soda that it is neutralized process, makes pH value reach country's discharge mark Discharge after standard.Its shortcoming is that to neutralize reagent cost high, expensive, and spent acid treating capacity receives restriction, and the sulfur in pickle liquor Acid, FeSO4) etc. resource be not utilized effectively.
Sulphate of iron method use concentrate, cool down, the means such as crystallization, make ferrous sulfate crystallization separate out, and dry recovery.It lacks Point is that equipment investment is big, and troublesome poeration processes frequently, and the production cycle is long, and energy consumption is high, can only reclaim ferrous sulfate, it is impossible to reclaim Sulphuric acid.
Electroosmose process: utilize the effect of electric field, draws ion at electrode, through ion exchange membrane.Its shortcoming is consumption Electricity is the highest.
Bioanalysis: generally oxidation pickle liquor French is carried out under conditions of PH is higher.Foreign study result shows, permissible Aoxidize divalent iron salt with microorganism one Thiobacillus, then produce Huang hinge ferrovanadium in hydrolysis.Its shortcoming the method has certain limitation, Need at NH4+Just can smoothly complete under conditions of existence.Operation and processing procedure are more complicated, are difficult to control reaction condition.
Summary of the invention
In order to overcome the problems of the prior art, the technical problem to be solved in the present invention is to provide a kind of energy-saving and environmental protection And at steel and iron industry sulfuric acid waste treatment technology, no pollution during acid washing rolled steel can be realized, comply fully with the steel of environmental requirement Material sulfuric acid waste process and reclaim method and system.
The process of the technical scheme is that a kind of steel industry sulfuric acid pickling waste liquid of the present invention Recovery system, including single filter unit, reaction member and cascade filtration unit, acid pickle entrance passes through pipeline through water pump and valve Door is connected to the filter inlet on single filter unit top, and the filter outlet of single filter unit bottom is connected by pipeline To reaction member upper entrance, the reactant liquor outlet bottom reaction member is connected to cascade filtration by pipeline through water pump and valve The filter inlet on unit top, the filter outlet of cascade filtration unit bottom is connected to circulating and recovering by pipeline through valve Mouthful, described system also includes that bipolar membrane electrodialysis equipment, described bipolar membrane electrodialysis equipment include that alkali liquor circulating box, saline solution circulate Case, acid cycle case and pole water circulating box, described circulating and recovering mouth is connected to the entrance of saline solution circulating box, described alkali by pipeline The outlet of liquid circulating box is connected to reaction member upper entrance by pipeline, is additionally provided with uniformly bottom described reaction member intracavity The aeration head of arrangement, described aeration head is connected to the air inlet bottom reaction member by pipeline, described air inlet also sets up Having aerator, the outlet of described acid cycle case to be connected to pickling lines, the leakage fluid dram of described pickling lines connects spent acid Liquid entrance.
Further, system also includes control module, the described PH value detector that is additionally provided with before valve pipeline, and pH value is examined Surveying instrument to electrically connect with control module, described PH value detector is connected to floss hole, described valve and valve by pipeline via valve Door is electric control valve and electrically connects with control module.
Further, described single filter unit and cascade filtration unit are bag filter.
Further, the application also provides for a kind of applying said system to return for the process of steel industry sulfuric acid pickling waste liquid Receiving method, described method comprises the steps:
Step one, by the Na of prescribed concentration2SO4Solution is placed in the salt chamber circulating water groove of bipolar membrane electrodialysis equipment, starts double Pole EDBM equipment, acid cycle groove carries out closed cycle 10-15 minute, the H of generation2SO4Solution concentration is also on continuous Rise, work as H2SO4Solution concentration reach 5% mass than time, cause production line pickling lines by bypass, alkali liquor circulating box constantly enters Row closed cycle, the NaOH solution concentration of generation is also constantly rising, when NaOH concentration reach 4% mass than time, Bipolar Membrane electric osmose Desorption device quits work;
Step 2, described acid pickle discharge from pickling lines, enter acid pickle entrance, are connected through water pump and valve by pipeline Entering single filter unit, mixed solution is filtered by bag filter, removes large granular impurity and oil slick;
Step 3, filtrate step 2 obtained enter reaction member through the outlet of single filter unit bottom by pipeline, will The NaOH produced in the alkali liquor circulating box of bipolar membrane electrodialysis equipment, adds reaction member by pipeline;
Step 4, startup aerator, inputted air from the bottom to top to reaction member by aeration head, make NaOH solution and sulphuric acid Pickle liquor is the most sufficiently mixing in reaction member, and constantly aeration in mixed solution;
Step 5, mixed solution step 3 obtained are passed through in cascade filtration unit, and mixed solution is carried out by bag filter Filtering, supernatant and precipitate are carried out solid-liquid separation, solid is Fe (OH)3Reclaim after drying;
In step 6, step 5 supernatant flow through PH value detector, when supernatant PH >=8, control module control under, open Opening valve, supernatant enters saline solution circulating box by circulating and recovering mouth, when supernatant 6 < PH < when 8, under control module controls, is opened Opening valve, supernatant enters municipal drainage by floss hole.
For prior art, the invention has the beneficial effects as follows: the sulphuric acid that bipolar membrane electrodialysis system prepares can return acid Wash production line;The alkali liquor produced is for processing the Fe of sulfuric acid waste2+And replace out the sulfate radical in sulfuric acid waste and be back to use bipolar EDBM system antacid alkaline again;This technology can process steel industry sulfuric acid waste, makes Fe2+All with Fe(OH)3Solid Form precipitation is discharged;Replace out the sulfate radical of more than 95%;It is thus possible to realize the zero-emission of acid pickle.
This law has that current efficiency is high, can continuous and stable production, simple to operate, governance process be not required to add eo-acid or alkali, dress Equipment in putting, pipeline, valve etc. all use anti-corrosion material and technology.Device anticorrosion is long for durable service life, No leakage, arranges Compact, floor space is few, the operation low plurality of advantages of running expense, the most also includes following features: 1) flow process is succinct, energy-conservation, Easy to operate, floor space is little;2) system consumption is few, and operating cost is relatively low;3) sulphuric acid obtained, to be directly entered life Product line uses;4) obtain side-product hydrated ferric oxide. simultaneously, rear barreled can be dried and sell;5) energy-conservation, resource regeneration, pollutes Thing zero-emission, meets national requirements for environmental protection.
Accompanying drawing explanation
Fig. 1 is the structural representation that pickle liquor of the present invention processes recovery system;
Fig. 2 is the control module principle schematic of the present invention;
Fig. 3 is bipolar membrane electrodialysis equipment operation principle schematic diagram of the present invention;
Fig. 4 is the process chart that pickle liquor of the present invention processes recovery method.
In figure: 1 single filter unit, 2 reaction members, 3 cascade filtration unit, 4 acid pickle entrances, 5 water pumps, 6 valves, 8 Valve, 9 circulating and recovering mouths, 10 bipolar membrane electrodialysis equipment, 11 alkali liquor circulating boxes, 12 saline solution circulating boxes, 13 acid cycle casees, 14 Pole water circulating box, 15 aeration heads, 16 air inlets, 17 aerators, 18 state pickling lines, 19 PH value detector mouths, 20 valves, 21 control modules, 22 floss holes.
Detailed description of the invention
The present invention is described in further detail by 1-4 below in conjunction with the accompanying drawings, it is noted that embodiment described below is intended to It is easy to the understanding of the present invention, and it is not played any restriction effect.
As Figure 1-3, the application provides the process recovery system of a kind of steel industry sulfuric acid pickling waste liquid, including one-level Filter element 1, reaction member 2 and cascade filtration unit 3, acid pickle entrance 4 is connected to one by pipeline through water pump 5 and valve 6 The filter inlet on level filter element 1 top, it is single that the filter outlet bottom single filter unit 1 is connected to reaction by pipeline Unit's 2 upper entrances, the reactant liquor outlet bottom reaction member 2 is connected to cascade filtration unit by pipeline through water pump 5 and valve 6 The filter inlet on 3 tops, the filter outlet bottom cascade filtration unit 3 is connected to circulating and recovering by pipeline through valve 8 Mouthfuls 9, described system also include bipolar membrane electrodialysis equipment 10, described bipolar membrane electrodialysis equipment 10 include alkali liquor circulating box 11, Saline solution circulating box 12, acid cycle case 13 and pole water circulating box 14, described circulating and recovering mouth 9 is connected to saline solution by pipeline and circulates The entrance of case 12, the outlet of described alkali liquor circulating box 11 is connected to reaction member 2 upper entrance, described reaction member by pipeline Being additionally provided with evenly distributed aeration head 15 bottom 2 intracavity, described aeration head 15 is connected to bottom reaction member 2 by pipeline Air inlet 16, described air inlet 16 is additionally provided with aerator 17, and the outlet of described acid cycle case 13 is connected to pickling and produces Line 18, the leakage fluid dram of described pickling lines 18 connects acid pickle entrance 4.
Further improve the efficiency of the process recovery system of steel industry sulfuric acid pickling waste liquid, also include control module 21, described before valve 8 pipeline, it is additionally provided with PH value detector 19, PH value detector 19 electrically connects with control module 21, described PH value detector 19 is connected to floss hole 22 by pipeline via valve 20, and described valve 8 and valve 20 are electric control valve also Electrically connect with control module 21.
Further improve the efficiency of the process recovery system of steel industry sulfuric acid pickling waste liquid, described single filter unit 1 and cascade filtration unit 3 be bag filter.
As shown in Figure 4, system described in the claims is used for the process recovery method of steel industry sulfuric acid pickling waste liquid, Described method comprises the steps:
Step one, by the Na of prescribed concentration2SO4Solution is placed in the salt chamber circulating water groove 12 of bipolar membrane electrodialysis equipment 10, opens Dynamic bipolar membrane electrodialysis equipment 10, acid cycle groove 13 carries out closed cycle 10-15 minute, the H of generation2SO4Solution concentration also exists Constantly rise, work as H2SO4Solution concentration reach 5% mass than time, cause production line pickling lines 18 by bypass, alkali liquor circulates Case 11 constantly carries out closed cycle, and the NaOH solution concentration of generation is also constantly rising, when NaOH concentration reach 4% mass than time, Bipolar membrane electrodialysis equipment 10 quits work, and for preventing bipolar membrane electrodialysis equipment 10 film from blocking, steel and iron industry sulfuric acid washing gives up Liquid not directly enters bipolar membrane electrodialysis equipment 10, but the alkali liquor utilizing bipolar membrane electrodialysis equipment 10 to make goes and sulfuric acid waste React;
Step 2, described acid pickle discharge from pickling lines 18, enter acid pickle entrance 4, by pipeline through water pump 5 and valve 6 connect entrance single filter unit 1, and mixed solution is filtered by bag filter, removes large granular impurity and oil slick;
Step 3, filtrate step 2 obtained outlet bottom single filter unit 1 enter reaction member 2 by pipeline, The NaOH that will produce in the alkali liquor circulating box 11 of bipolar membrane electrodialysis equipment 10, adds reaction member 2 by pipeline;
Step 4, startup aerator 17, inputted air from the bottom to top to reaction member 2 by aeration head 15, make NaOH solution Uniformly sufficiently mix in reaction member 2 with sulfuric acid pickling waste liquid, and constantly aeration in mixed solution;
Step 5, mixed solution step 3 obtained are passed through in cascade filtration unit 3, and mixed solution is carried out by bag filter Filtering, supernatant and precipitate are carried out solid-liquid separation, solid is Fe (OH)3Reclaim after drying;
In step 6, step 5 supernatant flow through PH value detector 19, as PH=9, illustrate to react reaction in water tank and fill Point, Fe in acid pickle2+Precipitate the most completely, supernatant after filtering be composition be Na2SO4With a small amount of NaOH, now control Module 21 controls valve 8, and the liquid in pipeline is caused saline solution circulating box;As PH=8, in illustrating to react water tank, reaction is fully, Fe in acid pickle2+Precipitate the most completely, supernatant after filtering be composition be Na2SO4With a small amount of NaOH, now control module 21 control valve 8, and the liquid in pipeline is caused saline solution circulating box;As supernatant PH=7, although in neutrality, but now solution In still may contain the unprecipitated Fe of trace2+With a large amount of Na2SO4Solution, for preventing Fe2+Enter saline solution circulating box, at this moment control Module 21 controls valve 20, liquid in pipeline is entered city planting ductwork, and meets environmental requirement;As supernatant PH=6, explanation In reaction water tank, reaction is insufficient, is typically faintly acid, now containing a small amount of unprecipitated Fe in solution2+With a large amount of Na2SO4Molten Liquid, for preventing Fe2+Entering saline solution circulating box, at this moment control module 21 controls valve 20, and liquid in pipeline is entered city planting ductwork, And meet environmental requirement;Control module 21 uses PLC control system and man machine interface, and system reliability is high, and capacity of resisting disturbance is strong, Perfect in shape and function, client is non-maintaining, forms human computer conversation.
In sum, bipolar membrane electrodialysis equipment is prepared acid solution is used for steel and iron industry pickling lines and is used for pickling steel Material, saves cost of material;And utilize the alkali liquor of bipolar membrane electrodialysis equipment to go to process sulfuric acid waste.And use reaction water tank The mode of bottom aeration makes reactant liquor be more fully mixed, and constantly provides the oxygen of abundance in mixed solution, is greatly shortened Response time.And with bag filter, mixed solution after reaction is filtered, supernatant and precipitate are carried out solid-liquid separation. After reaction, the sulfate radical in sulfuric acid waste is replaced out, the Fe in sulfuric acid waste2+Form Precipitation.Pass through bag type filtering Supernatant after device filters can return to bipolar membrane electrodialysis equipment antacid alkaline again, greatly reduces raw material input cost.Heavy Shallow lake thing is outer after can drying to be sold.It is thus possible to realize the zero-emission of sulfuric acid waste.This method treatment effect is obvious, can continuous-stable Producing, equipment, pipe valve etc. all use anti-corrosion material, and anticorrosion is durable, and system operation running expense is low.
While embodiments of the present invention have been illustrated and described, for the ordinary skill in the art, can These embodiments can be carried out multiple change without departing from the principles and spirit of the present invention to understand, revise, replace Changing and modification, the scope of the present invention be defined by the appended.

Claims (4)

1. a process recovery system for steel industry sulfuric acid pickling waste liquid, including single filter unit (1), reaction member (2) With cascade filtration unit (3), acid pickle entrance (4) is connected to single filter unit by pipeline through water pump (5) and valve (6) (1) filter inlet on top, the filter outlet of single filter unit (1) bottom is connected to reaction member (2) by pipeline Upper entrance, the reactant liquor outlet of reaction member (2) bottom is connected to cascade filtration by pipeline through water pump (5) and valve (6) The filter inlet on unit (3) top, the filter outlet of cascade filtration unit (3) bottom is connected through valve (8) by pipeline To circulating and recovering mouth (9), it is characterised in that: described system also includes bipolar membrane electrodialysis equipment (10), described Bipolar Membrane electric osmose Desorption device (10) includes alkali liquor circulating box (11), saline solution circulating box (12), acid cycle case (13) and pole water circulating box (14), institute Stating circulating and recovering mouth (9) and be connected to the entrance of saline solution circulating box (12) by pipeline, the outlet of described alkali liquor circulating box (11) is led to Cross pipeline and be connected to reaction member (2) upper entrance, bottom described reaction member (2) intracavity, be additionally provided with evenly distributed aeration Head (15), described aeration head (15) is connected to the air inlet (16) of reaction member (2) bottom, described air inlet (16) by pipeline On be additionally provided with aerator (17), the outlet of described acid cycle case (13) is connected to pickling lines (18), and described pickling is raw The leakage fluid dram producing line (18) connects acid pickle entrance (4).
The process recovery system of a kind of steel industry sulfuric acid pickling waste liquid the most as claimed in claim 1, it is characterised in that: system Also include control module (21), on the pipeline between filter outlet and the valve (8) of described cascade filtration unit (3) bottom Being additionally provided with PH value detector (19), PH value detector (19) electrically connects with control module (21), described PH value detector (19) By pipeline via valve (20) be connected to floss hole (22), described valve (8) and valve (20) be electric control valve and with control Molding block (21) electrically connects.
The process recovery system of a kind of steel industry sulfuric acid pickling waste liquid the most as claimed in claim 1, it is characterised in that: described Single filter unit (1) and cascade filtration unit (3) are bag filter.
4. system described in the claims is for a process recovery method for steel industry sulfuric acid pickling waste liquid, and its feature exists In: described method comprises the steps:
Step one, by the Na of prescribed concentration2SO4Solution is placed in salt chamber circulating water groove (12) of bipolar membrane electrodialysis equipment (10), Starting bipolar membrane electrodialysis equipment (10), acid cycle groove (13) carries out closed cycle 10-15 minute, the H of generation2SO4Solution is dense Degree is also constantly rising, and works as H2SO4Solution concentration reach 5% mass than time, cause production line pickling lines (18) by bypass, Alkali liquor circulating box (11) carries out closed cycle simultaneously, and the NaOH solution concentration of generation is also constantly rising, when NaOH concentration reaches 4% mass than time, bipolar membrane electrodialysis equipment (10) quits work;
Step 2, described acid pickle discharge from pickling lines (18), enter acid pickle entrance (4), by pipeline through water pump (5) Connecting with valve (6) and enter single filter unit (1), mixed solution is filtered by bag filter, removes large granular impurity And oil slick;
Step 3, filtrate step 2 the obtained outlet through single filter unit (1) bottom enter reaction member by pipeline (2), the NaOH that will produce in the alkali liquor circulating box (11) of bipolar membrane electrodialysis equipment (10), add reaction member by pipeline (2);
Step 4, startup aerator (17), inputted air from the bottom to top to reaction member (2) by aeration head (15), make NaOH solution uniformly sufficiently mixes in reaction member (2) with sulfuric acid pickling waste liquid, and constantly aeration in mixed solution;
Step 5, mixed solution step 3 obtained are passed through in cascade filtration unit (3), and mixed solution is entered by bag filter Row filters, and supernatant and precipitate are carried out solid-liquid separation, and solid is Fe (OH)3Reclaim after drying;
Supernatant in step 6, step 5 flows through PH value detector (19), and when supernatant PH >=8, control module (21) is controlled Under system, Open valve (8), supernatant enters saline solution circulating box (12) by circulating and recovering mouth (9), when supernatant 6 < PH < when 8, Under control module (21) controls, Open valve (20), supernatant enters municipal drainage by floss hole (22).
CN201610869341.1A 2016-10-01 2016-10-01 The process recovery method of a kind of steel industry sulfuric acid pickling waste liquid and system thereof Pending CN106277474A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106702398A (en) * 2017-03-17 2017-05-24 青岛大仓防腐有限公司 Anti-corrosive acid washing method for steel pipe
CN107892281A (en) * 2017-10-31 2018-04-10 浙江海洋大学 A kind of system and method for reclaiming sulphur relieving haperacidity
CN109467121A (en) * 2018-12-26 2019-03-15 江苏中研创星材料科技有限公司 The method of the removal of impurities of metatitanic acid

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106702398A (en) * 2017-03-17 2017-05-24 青岛大仓防腐有限公司 Anti-corrosive acid washing method for steel pipe
CN107892281A (en) * 2017-10-31 2018-04-10 浙江海洋大学 A kind of system and method for reclaiming sulphur relieving haperacidity
CN107892281B (en) * 2017-10-31 2020-11-13 浙江海洋大学 System and method for recovering sulfuric acid
CN109467121A (en) * 2018-12-26 2019-03-15 江苏中研创星材料科技有限公司 The method of the removal of impurities of metatitanic acid

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