CN104760985A - System and method for producing carbide slag chemical gypsum by using industrial waste sulfuric acid - Google Patents
System and method for producing carbide slag chemical gypsum by using industrial waste sulfuric acid Download PDFInfo
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- CN104760985A CN104760985A CN201510133800.5A CN201510133800A CN104760985A CN 104760985 A CN104760985 A CN 104760985A CN 201510133800 A CN201510133800 A CN 201510133800A CN 104760985 A CN104760985 A CN 104760985A
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Abstract
The invention discloses a system and a method for producing carbide slag chemical gypsum by using industrial waste sulfuric acid. The system comprises a reaction system and a tail gas treatment system. The reaction system consists of a waste acid storage device, a carbide slag storage bin and a vacuum rake type reactor, wherein the reaction is performed in the vacuum rake type reactor and the reaction heat is taken away by circulating water. The tail gas treatment system comprises two filler absorbing towers, two circulating pumps, an alkali waste tank and a draught fan, wherein waste alkali liquid is used as an absorption solution, and the liquid obtained after adsorption is returned to the vacuum rake type reactor and is mixed with gypsum. The method is simple in flow, a reaction container is the vacuum rake type reactor and is convenient for discharging, and the reaction tail gas is easy to treat, so that the pollution to the atmosphere is greatly reduced; and a reaction tail gas washing tower in characterized in that two filled towers are connected in series to operate, the waste alkali liquid is used as an absorbing agent to perform two-stage washing, and the waste liquid which absorbs the tail gas is returned to the vacuum rake type reactor, so that the discharge of wastewater is avoided.
Description
Technical field
The present invention relates to a kind of system and method being raw material production carbide slag chemical gypsum with carbide slag and industrial waste sulfuric acid, belong to inorganic materials preparation and trade waste field of comprehensive utilization.
Background technology
At China's part chemical production device, the Waste Sulfuric Acid concentration produced in production process is still very high, can reach about 80%, this spent acid not easily processes, major part enterprise can only by its long storage periods, not only wasting space, and objectionable impurities wherein also can work the mischief to surrounding enviroment.This invention utilizes carbide slag and Waste Sulfuric Acid to react, and has both solved the storage problem of Waste Sulfuric Acid, generation be that the carbide slag chemical gypsum of main component can replace the plaster of paris to fire plaster of Paris or be incorporated in cement with calcium sulfate, realize economic benefit.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of system and production method of industry by-product gypsum, utilize present method both can realize the process of Waste Sulfuric Acid, carbide slag chemical gypsum can be produced again, for the production of plaster of Paris or cement.
For achieving the above object, the present invention adopts following technical scheme:
Utilize industrial waste sulfuric acid to produce a system for carbide slag chemical gypsum, comprising:
Carbide slag feed bin, spent acid storing unit, vacuum rake type reactor, the first washing tower, the second washing tower and induced draft fan; Wherein, described spent acid storing unit is connected with the first washing tower respectively by vacuum rake type reactor with carbide slag feed bin, and the first washing tower is connected to induced draft fan by the second washing tower;
The exit end of described second washing tower is connected to the entrance end of the first washing tower by the first circulating conveyor, the exit end of the first washing tower is connected to vacuum rake type reactor by the second circulating conveyor;
The entrance end of the second described washing tower is connected with salkali waste storing unit.
Preferably, the opening for feed of described carbide slag feed bin is connected with carbide slag bucket elevator by star-shaped discharge valve.
Preferably, described vacuum rake type reactor is connected with air compression plant.
Described vacuum rake type reactor adopts jacket water (J.W.) cooling, utilizes recirculated water to take away reaction liberated heat.
Described vacuum rake type reactor is provided with the upper water inlet of circulation, circulating backwater outlet and discharge opening.
Preferably, described first washing tower and the second washing tower are packed absorber.
Utilize industrial waste sulfuric acid to produce a method for carbide slag chemical gypsum, comprise the following steps:
(1) Waste Sulfuric Acid spray enters vacuum rake type reactor and carbide slag reacts, and reaction times 20 ~ 30min, obtains carbide slag chemical gypsum after having reacted, and passes into instrument air purging, carries out discharging after purging;
(2) reaction end gas after purging enters the first washing tower and the second washing tower to carry out after two-stage washing through induced draft fan emptying; Scrub raffinate after the second washing tower washing enters the first washing tower, and the scrub raffinate after the first washing tower washing tail gas returns vacuum rake type reactor and neutralizes with acid.
In step (1), the mass concentration of described Waste Sulfuric Acid is 80%(w/w).
In step (1), the mass ratio of described carbide slag and Waste Sulfuric Acid is 6 ~ 7:10.
In step (1), purge time is 20min.
In step (2), the flow of scrub raffinate is 30m
3/ h.
The invention has the beneficial effects as follows: simply, reaction vessel is vacuum rake type reactor, and target tooth can serve as whipping appts for the inventive method and system flow, material reaction can be made even, Reaction time shorten, reduces reaction dead angle; Vacuum rake type reactor adopts jacket water (J.W.) cooling, utilizes recirculated water can take away reaction liberated heat in time, avoids reactor overtemperature and etching apparatus, can work-ing life of effective extension device; This reaction product viscosity is comparatively large, rake reactor easy-unloading, and reaction end gas easily processes, and greatly reduces the pollution to air; Reaction end gas washing tower is two packing tower serial operations, adopts waste lye to carry out two-stage washing as absorption agent, absorbs the waste back-cycling vacuum rake type reactor of tail gas, can not produce the discharge of waste water.
Accompanying drawing explanation
Fig. 1 is present system schematic diagram.
Wherein, 1, carbide slag feed bin, 2, waste acid pot, 3, spent acid pump, 4, vacuum rake type reactor, the 5, first washing tower, 6, the second washing tower, 7, induced draft fan, 8, salkali waste tank, the 9, first recycle pump, 10, the second recycle pump, 11, air compressor, 12, carbide slag bucket elevator, 13, star-shaped discharge valve.
Embodiment
Embodiment 1
Below in conjunction with drawings and Examples, the present invention is further described.
Utilize industrial waste sulfuric acid to produce a system for carbide slag chemical gypsum, comprise reactive system and exhaust treatment system.
Reactive system comprises waste acid pot 2, spent acid pump 3, carbide slag bucket elevator 12, carbide slag feed bin 1, vacuum rake type reactor 4.Exhaust treatment system comprises the first washing tower 5, second washing tower 6, first recycle pump 9, second recycle pump 10, salkali waste tank 8 and induced draft fan 7.
Wherein, described waste acid pot 2 is connected with the first washing tower 5 respectively by vacuum rake type reactor 4 with carbide slag feed bin 1, and the first washing tower 5 is connected to induced draft fan 7 by the second washing tower 6;
The exit end of described second washing tower 6 is connected to the entrance end of the first washing tower 5 by the first recycle pump 9, the exit end of the first washing tower 5 is connected to vacuum rake type reactor 4 by the second recycle pump 10;
The entrance end of the second described washing tower 6 is connected with salkali waste tank 8.
The opening for feed of described carbide slag feed bin 1 is connected with carbide slag bucket elevator 12 by star-shaped discharge valve 13.
Described vacuum rake type reactor 4 is connected with air compressor 11.
Described vacuum rake type reactor 4 adopts jacket water (J.W.) to cool, and utilizes recirculated water to take away reaction liberated heat.Described vacuum rake type reactor is provided with the upper water inlet of circulation, circulating backwater outlet and discharge opening.
Described first washing tower 5 and the second washing tower 6 are packed absorber.
Described vacuum rake type reactor 4, rake teeth can play stirring action, and aspect discharging again, is beneficial to tail gas absorption in addition.Utilize waste lye as absorption liquid, the liquid closed cycle after absorption is got back to reactor and is mixed in gypsum, can not produce waste water and cause secondary pollution.
In said system, utilize industrial waste sulfuric acid to produce the method for carbide slag chemical gypsum, comprise the following steps:
Utilize carbide slag bucket elevator 12 that carbide slag (white lime content 95%) is sent into carbide slag feed bin 1, vacuum rake type reactor 4 is entered through star-shaped discharge valve 13, the external world carrys out 80% Waste Sulfuric Acid and is stored in waste acid pot 2, be transported to point four road sprays above vacuum rake type reactor 4 with spent acid pump 3 and enter vacuum rake type reactor 4, carbide slag inlet amount is 1.31 tons, Waste Sulfuric Acid add-on is 1.875 tons, and the reaction times is half hour.
Vacuum rake type reactor 4 adopts jacket water (J.W.) to cool, and utilizes recirculated water to take away reaction liberated heat, and ratio of components controls alkali little over amount.The instrument air passed in air compressor 11 purges, and reaction end gas enters the first washing tower 5 and the second washing tower 6 to carry out after two-stage washing through induced draft fan 7 emptying.Washings is the waste lye in factory, be stored in salkali waste tank 8, scrub raffinate after the second washing tower 6 washs pumps into the first washing tower 5 by the first recycle pump 9, and the scrub raffinate after the first washing tower 5 washs tail gas returns vacuum rake type reactor 4 by the second recycle pump 10 and neutralizes with acid.Scrub raffinate internal circulating load controls at 30m
3/ h.
Purge discharging after half an hour, product utilization belt or forklift transport.Generate about 3.25 tons of gypsum mud (taking calcium sulfate as the carbide slag chemical gypsum of main component).
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (10)
1. utilize industrial waste sulfuric acid to produce a system for carbide slag chemical gypsum, it is characterized in that: comprise carbide slag feed bin, spent acid storing unit, vacuum rake type reactor, the first washing tower, the second washing tower and induced draft fan; Wherein, described spent acid storing unit is connected with the first washing tower respectively by vacuum rake type reactor with carbide slag feed bin, and the first washing tower is connected to induced draft fan by the second washing tower;
The exit end of described second washing tower is connected to the entrance end of the first washing tower by the first circulating conveyor, the exit end of the first washing tower is connected to vacuum rake type reactor by the second circulating conveyor;
The entrance end of the second described washing tower is connected with salkali waste storing unit.
2. the system utilizing industrial waste sulfuric acid to produce carbide slag chemical gypsum according to claim 1, is characterized in that: the opening for feed of described carbide slag feed bin is connected with carbide slag bucket elevator by star-shaped discharge valve.
3. the system utilizing industrial waste sulfuric acid to produce carbide slag chemical gypsum according to claim 1, is characterized in that: described vacuum rake type reactor is connected with air compression plant.
4. the system utilizing industrial waste sulfuric acid to produce carbide slag chemical gypsum according to claim 1, is characterized in that: described vacuum rake type reactor adopts jacket water (J.W.) cooling, utilizes recirculated water to take away reaction liberated heat.
5. the system utilizing industrial waste sulfuric acid to produce carbide slag chemical gypsum according to claim 1, is characterized in that: described first washing tower and the second washing tower are packed absorber.
6. utilize industrial waste sulfuric acid to produce the method for carbide slag chemical gypsum according to claim 1, comprise the following steps:
(1) Waste Sulfuric Acid spray enters vacuum rake type reactor and carbide slag reacts, and reaction times 20 ~ 30min, obtains carbide slag chemical gypsum after having reacted, and passes into instrument air purging, carries out discharging after purging;
(2) reaction end gas after purging enters the first washing tower and the second washing tower to carry out after two-stage washing through induced draft fan emptying; Scrub raffinate after the second washing tower washing enters the first washing tower, and the scrub raffinate after the first washing tower washing tail gas returns vacuum rake type reactor and neutralizes with acid.
7. utilize industrial waste sulfuric acid to produce the method for carbide slag chemical gypsum according to claim 6, it is characterized in that: in step (1), the mass concentration of described Waste Sulfuric Acid is 80%.
8. utilize industrial waste sulfuric acid to produce the method for carbide slag chemical gypsum according to claim 6, it is characterized in that: in step (1), the mass ratio of described carbide slag and Waste Sulfuric Acid is 6 ~ 7:10.
9. utilize industrial waste sulfuric acid to produce the method for carbide slag chemical gypsum according to claim 6, it is characterized in that: in step (1), purge time is 20min.
10. utilize industrial waste sulfuric acid to produce the method for carbide slag chemical gypsum according to claim 6, it is characterized in that: in step (2), the flow of scrub raffinate is 30m
3/ h.
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| CN201510133800.5A CN104760985A (en) | 2015-03-25 | 2015-03-25 | System and method for producing carbide slag chemical gypsum by using industrial waste sulfuric acid |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107879369A (en) * | 2016-09-29 | 2018-04-06 | 内蒙古乌海化工有限公司 | A kind of Waste Sulfuric Acid processing system and method |
| CN108405552A (en) * | 2018-02-08 | 2018-08-17 | 兰州康顺石化有限责任公司 | Chemical industry acid sludge Neutralisation treatment method |
| CN109336159A (en) * | 2018-11-09 | 2019-02-15 | 陕西黑猫焦化股份有限公司 | Acetylene-formaldehyde process produces waste acid treatment technique caused by 1,4- butanediol |
| CN109603700A (en) * | 2018-11-27 | 2019-04-12 | 中国成达工程有限公司 | Utilize calcium carbide Slag treatment acetylene cleaning Waste Sulfuric Acid technique and device |
| CN114031102A (en) * | 2021-08-16 | 2022-02-11 | 安徽华塑股份有限公司 | Process for preparing gypsum by-product sulfuric acid |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103668424A (en) * | 2013-12-20 | 2014-03-26 | 中国地质大学（武汉） | Method utilizing calcium carbide slag as raw material to produce gypsum crystal whisker |
| CN104085974A (en) * | 2014-06-21 | 2014-10-08 | 安徽华塑股份有限公司 | Waste sulfuric acid treatment process |
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2015
- 2015-03-25 CN CN201510133800.5A patent/CN104760985A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103668424A (en) * | 2013-12-20 | 2014-03-26 | 中国地质大学（武汉） | Method utilizing calcium carbide slag as raw material to produce gypsum crystal whisker |
| CN104085974A (en) * | 2014-06-21 | 2014-10-08 | 安徽华塑股份有限公司 | Waste sulfuric acid treatment process |
Non-Patent Citations (1)
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107879369A (en) * | 2016-09-29 | 2018-04-06 | 内蒙古乌海化工有限公司 | A kind of Waste Sulfuric Acid processing system and method |
| CN108405552A (en) * | 2018-02-08 | 2018-08-17 | 兰州康顺石化有限责任公司 | Chemical industry acid sludge Neutralisation treatment method |
| CN109336159A (en) * | 2018-11-09 | 2019-02-15 | 陕西黑猫焦化股份有限公司 | Acetylene-formaldehyde process produces waste acid treatment technique caused by 1,4- butanediol |
| CN109603700A (en) * | 2018-11-27 | 2019-04-12 | 中国成达工程有限公司 | Utilize calcium carbide Slag treatment acetylene cleaning Waste Sulfuric Acid technique and device |
| CN114031102A (en) * | 2021-08-16 | 2022-02-11 | 安徽华塑股份有限公司 | Process for preparing gypsum by-product sulfuric acid |
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Application publication date: 20150708 |