CN105016308A - Device and method for recycling sulfur in acidolysis exhaust gas - Google Patents
Device and method for recycling sulfur in acidolysis exhaust gas Download PDFInfo
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- CN105016308A CN105016308A CN201510475249.2A CN201510475249A CN105016308A CN 105016308 A CN105016308 A CN 105016308A CN 201510475249 A CN201510475249 A CN 201510475249A CN 105016308 A CN105016308 A CN 105016308A
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- tail gas
- sulphur
- gas
- acid hydrolysis
- acidolysis
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Abstract
The invention discloses a device and method for recycling sulfur in acidolysis exhaust gas. The device comprises an exhaust gas conveying pipeline, a Venturi tube and an alkali spraying tower. An air conveying pipeline, a cyclone separator and an air blower are added. After being mixed, acidolysis exhaust gas and air enter the cyclone separator for reaction and separation, and residual gas sequentially passes through the Venturi tube and the alkali spraying tower to be exhausted. When the device is used for recycling sulfur in acidolysis exhaust gas, air with the volume of the acidolysis exhaust gas being 20%-50% and the acidolysis exhaust gas are mixed and subjected to a reaction to generate sulfur, then, the cyclone separator is used for separating out and recycling the sulfur, and the residual exhaust gas passes through the Venturi tube and the alkali spraying tower for neutralization and desulfuration to be exhausted into the atmosphere. By means of the device and method, 0.5-0.8 kg of sulfur can be recycled from the acidolysis exhaust gas generated by ilmenite per ton, the exhausted gas can reach the exhaust emission index of the sulfur content of the national standard, and the consumption of dilute alkali is only 20-60% that of a traditional mode.
Description
Technical field
Embodiments of the present invention relate to sulfate process titanium dioxide preparation field, and more specifically, embodiments of the present invention relate to sulfuric acid process and prepare the device and method reclaiming sulphur in acid hydrolysis tail gas in titanium white process.
Background technology
Sulfuric acid process is the selection of titanium ore resources characteristic and market discipline as the main production of China's Producing Titanium Dioxide.Sulfate process titanium dioxide is produced to cleaning the inevitable requirement that development is Chinese society development, and acid hydrolysis tail gas improvement is the important content of sulfate process titanium dioxide cleaner production.
Acid hydrolysis tail gas is the tail gas produced in acid hemolysis process, main containing acid mist, SO in tail gas
2, H
2s and a large amount of water vapor, producing conventional treatment process at present has spraying process and absorption process two kinds, and wherein spraying process comprises " water+alkali " spraying process, large chimney spraying process, jet of water method, and absorption process mainly refers to that dynamic wave administers method.Although these methods effectively can administer sulfuric acid droplets, SO in acid hydrolysis tail gas
2and SO
3but, these methods all by sulfur-bearing thing when refuse process, it is comparatively large to consume alkali lye amount, and due to sulphur content in tail gas higher, more serious to the corrosion of exhaust fan.In addition, because the instantaneous quantity discharged of acid hydrolysis tail gas is large, not in time, tail gas can not qualified discharge, causes Environment Pollution Event for usually conduct.
Relevant acid hydrolysis tail gas studies in China is more, and concrete document is as follows:
Inorganic chemicals industry (7 phases in 2007) author Tang Wen paper " sulfate process titanium dioxide produce in environment protection treating measure " of holding high up describes the method for domestic used Alkali absorption and dynamic wave two kinds process acid hydrolysis tail gas, does not relate to the recycling of sulphur in sulfur-containing tail gas.
Application number 201210235007.2 patent discloses a kind for the treatment of process of titanium dioxide acid hydrolysis tail gas, concrete summary of the invention is first absorb sulfuric acid and sulfurous gas in acid hydrolysis tail gas with weakly acidic water, and then spray residual gas with alkaline water at Venturi, do not reclaim the sulphur in tail gas.
China's coating (10 phases in 2005) author Luo Wusheng paper " process of Acid Hydrolysis Tail Gas in Titanium White Powder Factory " describes the innovative approach of several acid hydrolysis tail gas qualified discharge, specifically by more ventilating fan, valve and hydrogen peroxide oxidation SO
2method, make acid hydrolysis tail gas qualified discharge, although relate to the wear-resistant problem of exhaust fan, the measure adopted is more ventilating fan material, and the amount of non-reduced sulfur granule.
As can be seen here, exhaust gas treating method has only been related in above document, and make its qualified discharge with the sulphur in alkali lye and in tail gas, and in alkali lye and tail gas in sulphur after enter waste liquid pool, such processing mode does not only reclaim sulphur wherein, cause the wasting of resources, and alkali lye consumption is higher, vent gas treatment cost is larger.
Summary of the invention
Instant invention overcomes the deficiencies in the prior art, a kind of device and method reclaiming sulphur in acid hydrolysis tail gas is provided, reclaim the sulphur in acid hydrolysis tail gas, not only can solve the etching problem of element sulphur to exhaust fan, but also the consumption of alkali lye can be reduced, belong to the treatment process of low cost, high-level efficiency acid hydrolysis tail gas.
For solving above-mentioned technical problem, one embodiment of the present invention by the following technical solutions:
A kind of device reclaiming sulphur in acid hydrolysis tail gas, comprise exhaust pipe road, Venturi and alkali spray tower, one end, described exhaust pipe road is connected with Venturi, Venturi sprays tower by pipeline and alkali and is connected, described exhaust pipe road increases the cyclonic separator of airflow pipe and corrosion-and high-temp-resistant, the gas inlet end of described airflow pipe arranges gas blower, enter described cyclonic separator after acid hydrolysis tail gas in exhaust pipe road and the air in airflow pipe converge and carry out reaction and separation processes, residual gas is discharged successively after Venturi and alkali spray tower.
Further technical scheme is: in recovery acid hydrolysis tail gas of the present invention sulphur device in, the diameter of airflow pipe is the 1/3-1/2 of the diameter in exhaust pipe road.
Present invention also offers the method adopting said apparatus to reclaim sulphur in acid hydrolysis tail gas, it comprises the following steps:
(1) when acid hydrolysis tail gas enters exhaust pipe road, blast a certain amount of air with gas blower, acid hydrolysis tail gas and air mixed form mixed gas;
(2) described mixed gas fully reacts rear generation sulphur and enters in cyclonic separator with gas, is separated and obtains SULPHUR POWDER and residual exhaust, recovery sulphur;
(3) residual exhaust of step (2) gained successively through Venturi and alkali spray tower further in and desulfurization process, the residual gas after process is discharged to air.
Further technical scheme is: device of the present invention reclaims in the method for sulphur in acid hydrolysis tail gas, and the air capacity that described gas blower blasts is the 20%-50% of acid hydrolysis tail gas volume fraction.
Further technical scheme is: device of the present invention reclaims in the method for sulphur in acid hydrolysis tail gas, and Venturi and alkali spray tower utilize in diluted alkaline and desulfurization, and described diluted alkaline is sodium hydroxide solution, and its mass concentration is 1%-10%, and temperature is 10-40 DEG C.
Compared with prior art, one of beneficial effect of the present invention is: utilize apparatus and method of the present invention, the acid hydrolysis tail gas that ilmenite acidolysis per ton produces can reclaim 0.5-0.8kg sulphur powder, acid hydrolysis tail gas reclaims after sulphur through cyclonic separator, sulphur content in acid hydrolysis tail gas is reduced to 20%-40% before treatment, acid hydrolysis tail gas enter Venturi and alkali spray tower further in and after desulfurization process gained gas in sulphur content be less than 200ppm/Nm
3reach the discharge index of sulphur content in national standard, in alkali spray tower and Venturi, the consumption of diluted alkaline is only the 20%-60% (traditional way refers to the desulfurization method not having recovery sulphur powder) of traditional way, and more the frequency of ventilating fan was reduced to 60 ~ 90 days from traditional 15 ~ 30 days.
Accompanying drawing explanation
Fig. 1 is the structural representation that the present invention reclaims the device of sulphur in acid hydrolysis tail gas.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Panxi Diqu is the silo of China's titanium resource, and the titanium since domestic 90% is from this area, but it is relatively high to climb sulphur content in western ilmenite, and content reaches 0.102%, and its concrete composition is in table 1.After such ilmenite acidolysis, S is mainly with H
2s and SO
2form exist in tail gas, and H in tail gas
2s amount is much larger than SO
2amount.Due to H
2s and SO
2easily react, easy generation sulphur powder, in Flos Bombacis Malabarici titanium powder plant acidolysis post, at common a large amount of yellow sulphur powder in place such as acidolysis pot, flue, exhaust fans, these SULPHUR POWDER cause tail gas flue blockage, tail gas general mood spoilage is high, in order to keep normal production, need the system of cleaning flues 1-2 time weekly, and blower fan is changed frequent, had a strong impact on the continuity of producing like this, maintenance of equipment expense is higher.
Western ilmenite typical case main component/% climbed by table 1
| Composition | TiO 2 | FeO | Fe 2O 3 | CaO | MgO | SiO 2 | Al 2O 3 | S | P |
| Content | 46.3 | 34.34 | 5.52 | 1.57 | 5.89 | 4.46 | 1.70 | 0.102 | 0.013 |
Therefore, in order to reduce the sulphur content in acid hydrolysis tail gas, solving the etching problem of exhaust fan, reducing alkali lye consumption.The present invention is mainly for producing the higher sulphur tail gas of content after the ilmenite acidolysis of Pan Xi, thus the sulphur in recovery tail gas, be specially and increase cyclonic separator in exhaust pipe road, and blast a certain amount of air with gas blower, make H in tail gas by the ratio controlling air and acid hydrolysis tail gas
2o in S gas and air
2reaction generates sulphur, and the sulfur granule of generation is separated with acid hydrolysis tail gas after cyclonic separation, thus reaches the object reclaiming sulphur, and its device schematic diagram as shown in Figure 1.When after recovery sulphur, acid hydrolysis tail gas progressively enters Venturi and alkali spray tower is sprayed by diluted alkaline, in and remaining sulphur in acid hydrolysis tail gas, after neutralization, sulphur content can be reduced under Standard in acid hydrolysis tail gas, thus qualified discharge.
As shown in Figure 1, in recovery acid hydrolysis tail gas of the present invention, the device of sulphur has exhaust pipe road 102: for carrying acid hydrolysis tail gas 101, Venturi 104: control gas flow with in and desulfurization, alkali spray tower 105: in and desulfurization.One end, exhaust pipe road 102 is connected with Venturi 104, and acid hydrolysis tail gas 101 is imported Venturi 104 from acidolysis device, and Venturi 104 sprays tower 105 by pipeline and alkali and is connected, and acid hydrolysis tail gas 101 is transferred to alkali spray tower 105 from Venturi 104.In addition, exhaust pipe road 102 increases the cyclonic separator 103 of airflow pipe 107 and corrosion-and high-temp-resistant, the diameter of airflow pipe 107 is the 1/3-1/2 of the diameter in exhaust pipe road 102, the gas inlet end of airflow pipe 107 arranges gas blower 109, enter cyclonic separator 103 after acid hydrolysis tail gas 101 in exhaust pipe road 102 and the air 108 in airflow pipe 107 converge and carry out reaction and separation processes, obtain sulphur and residual gas, residual gas is discharged in air successively after Venturi 104 and alkali spray tower 105.Diluted alkaline (sodium hydroxide solution) 106 is all adopted, during the residual gas of process is carried out and desulfurization in Venturi 104 and alkali spray tower 105.
Said apparatus is adopted to reclaim the specific embodiment of sulphur in acid hydrolysis tail gas as embodiment 1 to embodiment 4.
Embodiment 1
30t sulfurous iron ore is dropped into acidolysis pot and carries out acidolysis, acidolysis adopts interval acid hydrolysis method to carry out, when acidolysis is carried out, open the device of sulphur in recovery acid hydrolysis tail gas of the present invention, in this device, blower air quantity is 40% of acid hydrolysis tail gas air quantity, and in tail gas, sulphur fully and air reaction, the sulphur powder generated is separated with tail gas by cyclonic separator, and being separated the sulphur powder obtained is 18kg.After reclaiming sulphur, tail gas enters Venturi and alkali spray tower carries out further and desulfurization process, and the sig water concentration of process is 5%, and temperature is 20 DEG C, and in the tail gas after process, sulphur content is less than 180ppm/Nm
3, reach sulphur content discharge index in national standard, can discharge in air.As calculated, after tail gas recycle sulphur, the sulphur content in tail gas is reduced to 40% before recovery, and sig water consumption is reduced to 50% when not reclaiming sulphur.
Embodiment 2
Adopt ilmenite acidolysis, acidolysis adopts continuous acidolysis mode to carry out, when acidolysis is carried out, open the device of sulphur in recovery acid hydrolysis tail gas of the present invention, in this device, blower air quantity is 25% of acid hydrolysis tail gas air quantity, and in tail gas, sulphur fully and air reaction, the sulphur powder generated is separated with tail gas by cyclonic separator, and being separated the sulphur powder obtained is ilmenite 0.7kg per ton.After reclaiming sulphur, tail gas enters Venturi and alkali spray tower carries out further and desulfurization process, and the sig water concentration of process is 3%, and temperature is 25 DEG C, and in the tail gas after process, sulphur content is less than 150ppm/Nm
3, reach sulphur content discharge index in national standard, can discharge in air.As calculated, after tail gas recycle sulphur, the sulphur content in tail gas is reduced to 25% before recovery, and sig water consumption is reduced to 30% when not reclaiming sulphur.
Embodiment 3
30t sulfurous iron ore is dropped into acidolysis pot and carries out acidolysis, acidolysis adopts interval acid hydrolysis method to carry out, when acidolysis is carried out, open the device of sulphur in recovery acid hydrolysis tail gas of the present invention, in this device, blower air quantity is 50% of acid hydrolysis tail gas air quantity, and in tail gas, sulphur fully and air reaction, the sulphur powder generated is separated with tail gas by cyclonic separator, and being separated the sulphur powder obtained is 17.5kg.After reclaiming sulphur, tail gas enters Venturi and alkali spray tower carries out further and desulfurization process, and the sig water concentration of process is 10%, and temperature is 35 DEG C, and in the tail gas after process, sulphur content is less than 180ppm/Nm
3, reach sulphur content discharge index in national standard, can discharge in air.As calculated, after tail gas recycle sulphur, the sulphur content in tail gas is reduced to 20% before recovery, and sig water consumption is reduced to 45% when not reclaiming sulphur.
Embodiment 4
Adopt ilmenite acidolysis, acidolysis adopts continuous acidolysis mode to carry out, when acidolysis is carried out, open the device of sulphur in recovery acid hydrolysis tail gas of the present invention, in this device, blower air quantity is 30% of acid hydrolysis tail gas air quantity, and in tail gas, sulphur fully and air reaction, the sulphur powder generated is separated with tail gas by cyclonic separator, and being separated the sulphur powder obtained is ilmenite 0.8kg per ton.After reclaiming sulphur, tail gas enters Venturi and alkali spray tower carries out further and desulfurization process, and the sig water concentration of process is 5%, and temperature is 40 DEG C, and in the tail gas after process, sulphur content is less than 150ppm/Nm
3, reach sulphur content discharge index in national standard, can discharge in air.As calculated, after tail gas recycle sulphur, the sulphur content in tail gas is reduced to 28% before recovery, and sig water consumption is reduced to 25% when not reclaiming sulphur.
Although with reference to multiple explanatory embodiment of the present invention, invention has been described here, but, should be appreciated that, those skilled in the art can design a lot of other amendment and embodiment, these amendments and embodiment will drop within spirit disclosed in the present application and spirit.More particularly, in scope disclosed in the present application, multiple modification and improvement can be carried out to the building block of subject combination layout and/or layout.Except the modification of carrying out building block and/or layout is with except improvement, to those skilled in the art, other purposes also will be obvious.
Claims (5)
1. one kind is reclaimed the device of sulphur in acid hydrolysis tail gas, comprise exhaust pipe road, Venturi and alkali spray tower, one end, described exhaust pipe road is connected with Venturi, Venturi sprays tower by pipeline and alkali and is connected, it is characterized in that the cyclonic separator described exhaust pipe road increasing airflow pipe and corrosion-and high-temp-resistant, the gas inlet end of described airflow pipe arranges gas blower, enter described cyclonic separator after acid hydrolysis tail gas in exhaust pipe road and the air in airflow pipe converge and carry out reaction and separation processes, residual gas is discharged successively after Venturi and alkali spray tower.
2. the device of sulphur in recovery acid hydrolysis tail gas according to claim 1, is characterized in that the diameter of described airflow pipe is the 1/3-1/2 of the diameter in exhaust pipe road.
3. adopt the device described in claim 1 or 2 to reclaim the method for sulphur in acid hydrolysis tail gas, it is characterized in that it comprises the following steps:
(1) when acid hydrolysis tail gas enters exhaust pipe road, blast a certain amount of air with gas blower, acid hydrolysis tail gas and air mixed form mixed gas;
(2) described mixed gas fully reacts rear generation sulphur and enters in cyclonic separator with gas, is separated and obtains SULPHUR POWDER and residual exhaust, recovery sulphur;
(3) residual exhaust of step (2) gained successively through Venturi and alkali spray tower further in and desulfurization process, the residual gas after process is discharged to air.
4. device according to claim 3 reclaims the method for sulphur in acid hydrolysis tail gas, it is characterized in that air capacity that described gas blower blasts is the 20%-50% of acid hydrolysis tail gas volume fraction.
5. device according to claim 3 reclaims the method for sulphur in acid hydrolysis tail gas, and it is characterized in that described Venturi and alkali spray tower utilize in diluted alkaline and desulfurization, described diluted alkaline is sodium hydroxide solution, and its mass concentration is 1%-10%, and temperature is 10-40 DEG C.
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| CN201510475249.2A CN105016308B (en) | 2015-08-05 | 2015-08-05 | Reclaim the device and method of sulfur in acid hydrolysis tail gas |
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| CN105016308B CN105016308B (en) | 2017-03-01 |
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| CN107315845A (en) * | 2016-06-12 | 2017-11-03 | 中国石油化工股份有限公司 | Sulphur unit tail gas method up to standard |
| CN109276980A (en) * | 2018-10-18 | 2019-01-29 | 成都先进金属材料产业技术研究院有限公司 | The processing method of acid hydrolysis tail gas |
| CN111068484A (en) * | 2019-12-04 | 2020-04-28 | 广西雅照钛白有限公司 | Recycling and emission-reducing treatment device for sulfur in tail gas generated by continuous acidolysis of titanium dioxide |
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| CN111068484A (en) * | 2019-12-04 | 2020-04-28 | 广西雅照钛白有限公司 | Recycling and emission-reducing treatment device for sulfur in tail gas generated by continuous acidolysis of titanium dioxide |
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| CN105016308B (en) | 2017-03-01 |
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