CN112573489B - Comprehensive treatment process for waste sulfuric acid sludge and waste sulfuric acid on surface of metal product - Google Patents
Comprehensive treatment process for waste sulfuric acid sludge and waste sulfuric acid on surface of metal product Download PDFInfo
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- CN112573489B CN112573489B CN202011086508.XA CN202011086508A CN112573489B CN 112573489 B CN112573489 B CN 112573489B CN 202011086508 A CN202011086508 A CN 202011086508A CN 112573489 B CN112573489 B CN 112573489B
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- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 title claims abstract description 252
- 239000010802 sludge Substances 0.000 title claims abstract description 150
- 239000002699 waste material Substances 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 31
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 23
- 239000002184 metal Substances 0.000 title claims abstract description 23
- 239000013078 crystal Substances 0.000 claims abstract description 65
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 238000003756 stirring Methods 0.000 claims abstract description 25
- 239000000047 product Substances 0.000 claims abstract description 23
- 238000005406 washing Methods 0.000 claims abstract description 21
- 238000001704 evaporation Methods 0.000 claims abstract description 20
- 230000008020 evaporation Effects 0.000 claims abstract description 19
- 238000005554 pickling Methods 0.000 claims abstract description 17
- 239000002244 precipitate Substances 0.000 claims abstract description 17
- 238000002791 soaking Methods 0.000 claims abstract description 17
- 238000001035 drying Methods 0.000 claims abstract description 9
- 238000012216 screening Methods 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims description 16
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 claims description 16
- 238000007254 oxidation reaction Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000007800 oxidant agent Substances 0.000 claims description 10
- 230000001590 oxidative effect Effects 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 238000005086 pumping Methods 0.000 claims description 8
- 235000010288 sodium nitrite Nutrition 0.000 claims description 8
- 239000002912 waste gas Substances 0.000 claims description 8
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000010000 carbonizing Methods 0.000 claims description 2
- 230000002045 lasting effect Effects 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000003763 carbonization Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/90—Separation; Purification
- C01B17/901—Recovery from spent acids containing metallic ions, e.g. hydrolysis acids, pickling acids
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/88—Concentration of sulfuric acid
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/90—Separation; Purification
- C01B17/905—Removal of organic impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature 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
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a comprehensive treatment process of waste sulfuric acid sludge and waste sulfuric acid on the surface of a metal product, which comprises the following steps: step one: pickling the surface of a metal product, and a second step: carrying out solid-liquid separation on sludge and waste sulfuric acid, and step three: evaporating and stirring the sludge until the waste sulfuric acid in the sludge becomes crystals, adding the waste sulfuric acid in the second step into an evaporator until the sulfuric acid crystals appear, and step four: screening crystals and sludge in the third step, washing and soaking, separating liquid and sludge precipitate, then adding the liquid into an evaporation kettle, pressing the sludge into cakes and drying, and step five: the invention has simple treatment process, ensures that the sulfuric acid and the sludge are completely separated, has higher purity, does not contain sulfuric acid, has moderate pH value, can be directly dried, transported away and recycled, has no pollution in the whole process, and is beneficial to environmental protection.
Description
Technical Field
The invention relates to the technical field of comprehensive treatment of waste sulfuric acid sludge and waste sulfuric acid on the surface of a metal product, in particular to a comprehensive treatment process of the waste sulfuric acid sludge and the waste sulfuric acid on the surface of the metal product.
Background
The existing comprehensive treatment process of the waste sulfuric acid sludge and the waste sulfuric acid cannot completely separate the sulfuric acid from the sludge, the purity of the separated sulfuric acid and the separated sludge is low, pollution is possibly generated in the process, and the environment is also polluted, so that an improved technology is needed to solve the problem in the prior art.
Disclosure of Invention
The invention aims to provide a comprehensive treatment process for waste sulfuric acid sludge and waste sulfuric acid on the surface of a metal product, which enables the sulfuric acid and the sludge to be completely separated, has higher purity of the sulfuric acid, has moderate PH value, can be directly dried, transported away and reused, has no pollution in the whole process, and is beneficial to environmental protection, so as to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: the comprehensive treatment process of the waste sulfuric acid sludge and the waste sulfuric acid on the surface of the metal product comprises the following steps:
step one: firstly, pickling the surface of a metal product, and collecting sludge and waste sulfuric acid after pickling;
step two: carrying out solid-liquid separation on the sludge and the waste sulfuric acid to respectively obtain the waste sulfuric acid and the sludge;
step three: adding the sludge into an evaporation kettle, setting the temperature to be 150-160 ℃, then setting the rotating speed to be 30-40r/min until the residual waste sulfuric acid in the sludge becomes crystals, adding the waste sulfuric acid in the second step into an evaporator, and setting the temperature to be 120-130 ℃ until the sulfuric acid crystals appear;
step four: screening crystals in the sludge and the sludge in the step three, washing and soaking the screened crystals, standing for 3-4 hours, separating liquid from sludge precipitate, then adding the liquid into an evaporation kettle, setting the temperature to 120-130 ℃ until sulfuric acid crystals appear, mixing the sludge precipitate with the sludge, adding water into a mixer, setting the rotating speed to 100-120r/min, continuing for 15-20 minutes, pumping wet sludge into a filter press through a sludge pump, pressing the sludge into cakes, drying the sludge cakes, and conveying away;
step five: mixing the sulfuric acid crystals in the fourth step with the sulfuric acid crystals in the third step, adding the mixture into a stirring tank, adding concentrated sulfuric acid, setting the rotating speed of the stirring tank to be 200-250r/min, realizing carbonization of organic matters, adding an oxidant into the stirring tank, setting the temperature to be 80-90 ℃ and the rotating speed to be 220-250r/min, and continuously standing for 1-1.5h, so that the waste gas is collected in the oxidation process.
Preferably, a stirrer is arranged in the evaporation kettle in the third step.
Preferably, in the fourth step, a water washing tank is used for water washing and soaking, and an inclined hole plate is arranged in the water washing tank.
Preferably, the concentration of the concentrated sulfuric acid in the fifth step is 60-65%.
Preferably, in the fifth step, sodium nitrite is used as the oxidant.
Compared with the prior art, the invention has the beneficial effects that:
the process of the invention enables the sulfuric acid and the sludge to be completely separated, the purity of the sulfuric acid is higher, the sludge does not contain sulfuric acid and has moderate PH value, the sludge can be directly dried, transported away and reused, and the whole process has no pollution, thereby being beneficial to environmental protection.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a technical scheme that: the comprehensive treatment process of the waste sulfuric acid sludge and the waste sulfuric acid on the surface of the metal product comprises the following steps:
step one: firstly, pickling the surface of a metal product, and collecting sludge and waste sulfuric acid after pickling;
step two: carrying out solid-liquid separation on the sludge and the waste sulfuric acid to respectively obtain the waste sulfuric acid and the sludge;
step three: adding the sludge into an evaporation kettle, setting the temperature to be 150-160 ℃, then setting the rotating speed to be 30-40r/min until the residual waste sulfuric acid in the sludge becomes crystals, adding the waste sulfuric acid in the second step into an evaporator, and setting the temperature to be 120-130 ℃ until the sulfuric acid crystals appear;
step four: screening crystals in the sludge and the sludge in the step three, washing and soaking the screened crystals, soaking the crystals in a washing tank with an inclined hole plate, standing for 3-4 hours, separating liquid from sludge precipitate, then adding the liquid into an evaporation kettle, setting the temperature to 120-130 ℃ until sulfuric acid crystals appear, mixing the sludge precipitate and the sludge, adding the mixture into a mixer, adding water into the mixer, setting the rotating speed to 100-120r/min, lasting for 15-20min, pumping wet sludge into a filter press through a sludge pump, pressing the sludge into cakes, drying the sludge cakes, and conveying away;
step five: mixing the sulfuric acid crystals in the fourth step with the sulfuric acid crystals in the third step, adding the mixture into a stirring tank, adding concentrated sulfuric acid with the concentration of 60-65%, setting the rotating speed of the stirring tank to be 200-250r/min, carbonizing organic matters, adding an oxidant (sodium nitrite) into the stirring tank, setting the temperature to be 80-90 ℃ and the rotating speed to be 220-250r/min, and continuously standing for 1-1.5h to realize oxidization, and collecting waste gas in the oxidization process.
Embodiment one:
the comprehensive treatment process for the waste sulfuric acid sludge and the waste sulfuric acid on the surface of the metal product adopted in the embodiment comprises the following steps:
step one: firstly, pickling the surface of a metal product, and collecting sludge and waste sulfuric acid after pickling;
step two: carrying out solid-liquid separation on the sludge and the waste sulfuric acid to respectively obtain the waste sulfuric acid and the sludge;
step three: adding the sludge into an evaporation kettle, setting the temperature to 150 ℃, then setting the rotating speed to 30r/min until the residual waste sulfuric acid in the sludge becomes crystals, adding the waste sulfuric acid in the second step into an evaporator, and setting the temperature to 120 ℃ until the sulfuric acid crystals appear;
step four: screening crystals in the sludge and the sludge in the step three, washing and soaking the screened crystals, soaking the crystals in a washing tank with an inclined hole plate, standing for 3 hours, separating liquid from sludge precipitate, then adding the liquid into an evaporation kettle, setting the temperature to 120 ℃ until sulfuric acid crystals appear, mixing the sludge precipitate and the sludge, adding the sludge into a mixer, adding the water into the mixer, setting the rotating speed to 100r/min, continuing for 15min, pumping wet sludge into a filter press through a sludge pump, pressing the sludge into cakes, drying the sludge cakes, and conveying away;
step five: mixing the sulfuric acid crystals in the fourth step with the sulfuric acid crystals in the third step, adding the mixture into a stirring tank, adding concentrated sulfuric acid with the concentration of 60%, setting the rotating speed of the stirring tank to be 200r/min, realizing carbonization of organic matters, adding an oxidant (sodium nitrite) into the stirring tank, setting the temperature to be 80 ℃, setting the rotating speed to be 220r/min, and continuing for 1h, so as to realize oxidization, and collecting waste gas in the oxidization process.
Embodiment two:
the comprehensive treatment process for the waste sulfuric acid sludge and the waste sulfuric acid on the surface of the metal product adopted in the embodiment comprises the following steps:
step one: firstly, pickling the surface of a metal product, and collecting sludge and waste sulfuric acid after pickling;
step two: carrying out solid-liquid separation on the sludge and the waste sulfuric acid to respectively obtain the waste sulfuric acid and the sludge;
step three: adding the sludge into an evaporation kettle, setting the temperature to 160 ℃, then setting the rotating speed to 40r/min until the residual waste sulfuric acid in the sludge becomes crystals, adding the waste sulfuric acid in the second step into an evaporator, and setting the temperature to 130 ℃ until the sulfuric acid crystals appear;
step four: screening crystals in the sludge and the sludge in the step three, washing and soaking the screened crystals, soaking the crystals in a washing tank with an inclined hole plate, standing for 4 hours, separating liquid from sludge precipitate, then adding the liquid into an evaporation kettle, setting the temperature to 130 ℃ until sulfuric acid crystals appear, mixing the sludge precipitate and the sludge, adding the sludge into a mixer, adding the water into the mixer, setting the rotating speed to 120r/min, continuing for 20min, pumping wet sludge into a filter press through a sludge pump, pressing the sludge into cakes, drying the sludge cakes, and conveying away;
step five: mixing the sulfuric acid crystals in the fourth step with the sulfuric acid crystals in the third step, adding the mixture into a stirring tank, adding concentrated sulfuric acid with the concentration of 65%, setting the rotating speed of the stirring tank to be 250r/min, realizing carbonization of organic matters, adding an oxidant (sodium nitrite) into the stirring tank, setting the temperature to be 80-90 ℃ and the rotating speed to be 250r/min, and continuously standing for 1.5h, so as to realize oxidization and collecting waste gas in the oxidization process.
Embodiment III:
the comprehensive treatment process for the waste sulfuric acid sludge and the waste sulfuric acid on the surface of the metal product adopted in the embodiment comprises the following steps:
step one: firstly, pickling the surface of a metal product, and collecting sludge and waste sulfuric acid after pickling;
step two: carrying out solid-liquid separation on the sludge and the waste sulfuric acid to respectively obtain the waste sulfuric acid and the sludge;
step three: adding the sludge into an evaporation kettle, setting the temperature to 150 ℃, then setting the rotating speed to 40r/min until the residual waste sulfuric acid in the sludge becomes crystals, adding the waste sulfuric acid in the second step into an evaporator, and setting the temperature to 120 ℃ until the sulfuric acid crystals appear;
step four: screening crystals in the sludge and the sludge in the step three, washing and soaking the screened crystals, soaking the crystals in a washing tank with an inclined hole plate, standing for 3 hours, separating liquid from sludge precipitate, then adding the liquid into an evaporation kettle, setting the temperature to 120 ℃ until sulfuric acid crystals appear, mixing the sludge precipitate and the sludge, adding the sludge into a mixer, adding the water into the mixer, setting the rotating speed to 120r/min, continuing for 20min, pumping wet sludge into a filter press through a sludge pump, pressing the sludge into cakes, drying the sludge cakes, and conveying away;
step five: mixing the sulfuric acid crystals in the fourth step with the sulfuric acid crystals in the third step, adding the mixture into a stirring tank, adding concentrated sulfuric acid with the concentration of 60%, setting the rotating speed of the stirring tank to be 200r/min, realizing carbonization of organic matters, adding an oxidant (sodium nitrite) into the stirring tank, setting the temperature to be 80 ℃, setting the rotating speed to be 250r/min, and continuing for 1h, so as to realize oxidization, and collecting waste gas in the oxidization process.
Embodiment four:
the comprehensive treatment process for the waste sulfuric acid sludge and the waste sulfuric acid on the surface of the metal product adopted in the embodiment comprises the following steps:
step one: firstly, pickling the surface of a metal product, and collecting sludge and waste sulfuric acid after pickling;
step two: carrying out solid-liquid separation on the sludge and the waste sulfuric acid to respectively obtain the waste sulfuric acid and the sludge;
step three: adding the sludge into an evaporation kettle, setting the temperature to 160 ℃, then setting the rotating speed to 30r/min until the residual waste sulfuric acid in the sludge becomes crystals, adding the waste sulfuric acid in the second step into an evaporator, and setting the temperature to 130 ℃ until the sulfuric acid crystals appear;
step four: screening crystals in the sludge and the sludge in the step three, washing and soaking the screened crystals, soaking the crystals in a washing tank with an inclined hole plate, standing for 4 hours, separating liquid from sludge precipitate, then adding the liquid into an evaporation kettle, setting the temperature to 130 ℃ until sulfuric acid crystals appear, mixing the sludge precipitate and the sludge, adding the sludge into a mixer, adding the water into the mixer, setting the rotating speed to 120r/min, continuing for 15min, pumping wet sludge into a filter press through a sludge pump, pressing the sludge into cakes, drying the sludge cakes, and conveying away;
step five: mixing the sulfuric acid crystals in the fourth step with the sulfuric acid crystals in the third step, adding the mixture into a stirring tank, adding concentrated sulfuric acid with the concentration of 60%, setting the rotating speed of the stirring tank to be 250r/min, realizing carbonization of organic matters, adding an oxidant (sodium nitrite) into the stirring tank, setting the temperature to be 90 ℃ and the rotating speed to be 220r/min, and continuously standing for 1.5h, so that oxidation is realized, and waste gas is collected in the oxidation process.
Fifth embodiment:
the comprehensive treatment process for the waste sulfuric acid sludge and the waste sulfuric acid on the surface of the metal product adopted in the embodiment comprises the following steps:
step one: firstly, pickling the surface of a metal product, and collecting sludge and waste sulfuric acid after pickling;
step two: carrying out solid-liquid separation on the sludge and the waste sulfuric acid to respectively obtain the waste sulfuric acid and the sludge;
step three: adding the sludge into an evaporation kettle, setting the temperature to 155 ℃, then setting the rotating speed to 35r/min until the residual waste sulfuric acid in the sludge becomes crystals, adding the waste sulfuric acid in the second step into an evaporator, and setting the temperature to 125 ℃ until sulfuric acid crystals appear;
step four: screening crystals in the sludge and the sludge in the step three, washing and soaking the screened crystals, soaking the crystals in a washing tank with an inclined hole plate, standing for 3 hours, separating liquid from sludge precipitate, then adding the liquid into an evaporation kettle, setting the temperature to 125 ℃ until sulfuric acid crystals appear, mixing the sludge precipitate and the sludge, adding the sludge into a mixer, adding the water into the mixer, setting the rotating speed to 110r/min, continuing for 15min, pumping wet sludge into a filter press through a sludge pump, pressing the sludge into cakes, drying the sludge cakes, and conveying away;
step five: mixing the sulfuric acid crystals in the fourth step with the sulfuric acid crystals in the third step, adding the mixture into a stirring tank, adding concentrated sulfuric acid with the concentration of 65%, setting the rotating speed of the stirring tank to 220r/min, realizing carbonization of organic matters, adding an oxidant (sodium nitrite) into the stirring tank, setting the temperature to 85 ℃, setting the rotating speed to 230r/min, and continuing for 1h, so as to realize oxidization, and collecting waste gas in the oxidization process.
The comprehensive treatment process of the waste sulfuric acid sludge and the waste sulfuric acid on the surface of the hardware product in the first embodiment to the embodiment is used for comprehensively treating the waste sulfuric acid and the sludge, so that the sulfuric acid and the sludge are completely separated, the purity of the sulfuric acid is higher, the sludge does not contain sulfuric acid and has moderate pH value, the sludge can be directly dried, transported away and reused, and the whole process is pollution-free and is beneficial to environmental protection.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. A comprehensive treatment process for waste sulfuric acid sludge and waste sulfuric acid on the surface of a metal product is characterized by comprising the following steps of: the method comprises the following steps:
step one: firstly, pickling the surface of a metal product, and collecting sludge and waste sulfuric acid after pickling;
step two: carrying out solid-liquid separation on the sludge and the waste sulfuric acid to respectively obtain the waste sulfuric acid and the sludge;
step three: adding the sludge into an evaporation kettle, setting the temperature to be 150-160 ℃, then setting the rotating speed to be 30-40r/min until the residual waste sulfuric acid in the sludge becomes crystals, adding the waste sulfuric acid in the second step into an evaporator, setting the temperature to be 120-130 ℃ until the sulfuric acid crystals appear, and setting a stirrer in the evaporation kettle;
step four: screening crystals in the sludge and the sludge in the step three, washing and soaking the screened crystals, standing for 3-4 hours, separating liquid from sludge precipitate, then adding the liquid into an evaporation kettle, setting the temperature to 120-130 ℃ until sulfuric acid crystals appear, mixing the sludge precipitate with the sludge, adding water into a mixer, setting the rotating speed to 100-120r/min, lasting for 15-20 minutes, pumping wet sludge into a filter press through a sludge pump, pressing the sludge into cakes, drying the sludge cakes, conveying the cakes, and washing and soaking by adopting a washing tank, wherein an inclined pore plate is arranged in the washing tank;
step five: mixing the sulfuric acid crystals in the fourth step with the sulfuric acid crystals in the third step, adding the mixture into a stirring tank, adding concentrated sulfuric acid, setting the rotating speed of the stirring tank to be 200-250r/min, carbonizing organic matters, adding an oxidant into the stirring tank, setting the temperature to be 80-90 ℃ and the rotating speed to be 220-250r/min, and continuing for 1-1.5h, so as to realize oxidation, collecting waste gas in the oxidation process, wherein the concentration of the concentrated sulfuric acid is 60-65%, and the oxidant adopts sodium nitrite.
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| CN105036090A (en) * | 2015-04-23 | 2015-11-11 | 扬州祥发资源综合利用有限公司 | High-COD waste sulfuric acid recycling treatment process technology |
| DE102017202446A1 (en) * | 2016-12-21 | 2018-06-21 | Plinke Gmbh | Process for the treatment of waste sulfuric acid and apparatus for carrying out the process |
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