CN1262335C - Method of recovering waste sulfuric acid and waste gas produced in tatanium dioxide production - Google Patents
Method of recovering waste sulfuric acid and waste gas produced in tatanium dioxide production Download PDFInfo
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- CN1262335C CN1262335C CN 200410041226 CN200410041226A CN1262335C CN 1262335 C CN1262335 C CN 1262335C CN 200410041226 CN200410041226 CN 200410041226 CN 200410041226 A CN200410041226 A CN 200410041226A CN 1262335 C CN1262335 C CN 1262335C
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Abstract
The present invention relates to a method of recovering waste sulfuric acid and waste gas produced in the production of titanium white powder, which comprises the following steps that the grate waste gas and the waste sulfuric acid which are produced in the production of the titanium white powder are sent to an olefin sulfuric acid concentrating graphite tower of the waste gas of a titanium white powder grate to be mixed, to form gas-liquid contact and to be concentrated; next, the acid is separated from the titanium white powder containing in the acid, inorganic salt in the acid liquor is crystallizated and separated, and the acid liquor is sent to a silicon carbide evaporator further; finally, the partial water content in the acid liquor is removed by evaporating under the state of negative pressure, which makes the acid concentration reach 80 to 90%. The present invention not only can effectively solve the problem that the grate waste gas and the waste acid which are produced in the production of the titanium white powder pollute the environment, but also can recycle the grate waste gas and the waste acid. In addition, the present invention can extract the titanium white powder in the grate waste gas and the waste acid further, and recycled acid can be used for acid and alkali working sections in the production of the titanium white powder.
Description
Technical field:
The present invention relates to the recoverying and utilizing method of the refuse that produces in a kind of production process of titanium pigment.
Background technology:
In the existing production process of titanium pigment, the stove waste gas and the spent acid of generation not only can not further be utilized, and go back serious environment pollution.
Summary of the invention:
The object of the present invention is to provide a kind of pollution problem that not only can effectively solve the stove waste gas that produces in the production process of titanium pigment and spent acid, the sulfur waste acid that produces in can also production process of titanium pigment, the recovery method of waste gas with its recycling to environment.
Technical solution of the present invention is:
The sulfur waste acid that produces in a kind of production process of titanium pigment, the recovery method of waste gas is characterized in that: comprise the following steps:
1. the stove waste gas and the sulfur waste acid that produce in the production process of titanium pigment sent into mixing in " titanium dioxide stove tail gas is carried dense dilute sulfuric acid graphite tower ", gas-liquid contact, concentrated, the stepping of going forward side by side is gone into gas-liquid separator, gas-liquid separation;
2. above-mentioned isolated spent acid liquid is sent into solid-liquid separator, with acid and the divided titanium dioxide that wherein contains from, the acid solution that obtains after the separation enters the steam concentration systems and carries out concentration;
3. handle in the concentrated acid solution input crystallization kettle that will be after 2. step is handled, form the mixed liquor of inorganic salts crystalline particle and acid, then inorganic salts crystalline particle in the mixed liquor be separated, the acid that further concentrates;
4. the concentrated acid solution that will obtain after 3. step is handled is sent in the carborundum evaporimeter, and part moisture is removed in evaporation under negative pressure state, makes acid concentration reach 80～90%, gets final product.
The steam concentration systems has one-level one to imitate the steam enrichment facility, and one-level one connects one-level two effect steam enrichment facilities after imitating the steam enrichment facility, connects secondary steam enrichment facility after one-level two is imitated the steam enrichment facilities; One-level one effect steam enrichment facility, one-level two are imitated the steam enrichment facilities, secondary steam enrichment facility includes by an evaporimeter, a heater, the endless means that forced circulation pump is formed, the thermal source that one-level two is imitated steam enrichment facility heater adopts one-level one to imitate the steam that steam enrichment facility evaporimeter produces, and the thermal source of secondary steam enrichment facility heater adopts one-level two to imitate the steam that steam enrichment facility evaporimeter produces; One-level two is imitated the evaporimeter of steam enrichment facility, the evaporimeter of secondary steam enrichment facility all communicates with graphite condenser and barometric condenser; Step 2. in divided titanium dioxide from after acid solution successively by one-level one imitate the steam enrichment facility, one-level two is imitated steam enrichment facilities, secondary steam enrichment facility concentration.One-level two is imitated the heater of steam enrichment facility, the heater of secondary steam enrichment facility all adopts the graphite block heat exchanger graphite heater of being made by polytetrafluoroethylene (PTFE) graphite piece material.The crystallization kettle forms that the 3. middle crystallization kettle of step adopts three series connection to be provided with.Step 3. in from mixed liquor the method for separating inorganic salts crystalline particle be: with pump mixed liquor is sent in the mold pressing filter press filtration and handles.
The present invention not only can effectively solve the pollution problem to environment of the stove waste gas that produces in the production process of titanium pigment and spent acid, it can also be recycled: the titanium dioxide of carrying secretly in stove waste gas and the spent acid further can be extracted, restored acid can be back to the soda acid workshop section of production process of titanium pigment.
Description of drawings:
Accompanying drawing is the steam concentration systems diagrammatic sketch of one embodiment of the invention.
The invention will be further described below in conjunction with embodiment.
The specific embodiment:
Embodiment:
1. the stove waste gas and the sulfur waste acid that produce in the production process of titanium pigment are sent into " titanium dioxide stove tail gas is carried dense dilute sulfuric acid graphite tower " and (adopted Chinese patent: mixing ZL01217393.2 version), gas-liquid contact, concentrated, gas-liquid separator is gone in the stepping of going forward side by side, gas-liquid separation, make waste gas take away part moisture in the acid, and acid is carried dense to about 30% concentration, contain a little amount of titanium white powder that contains in the titanium dioxide that contains in a small amount of former stove waste gas and the former spent acid in acid this moment;
2. above-mentioned isolated spent acid liquid is sent into solid-liquid separator, with acid and the divided titanium dioxide that wherein contains from, the acid solution that obtains after the separation enters the steam concentration systems and carries out concentration.The steam concentration systems has one-level one to imitate steam enrichment facility 1, and one-level one connects one-level two effect steam enrichment facilities 2 after imitating steam enrichment facility 1, connects secondary steam enrichment facility 3 after one-level two is imitated steam enrichment facilities 2; One-level one is imitated the steam enrichment facility, one-level two is imitated the steam enrichment facility, secondary steam enrichment facility includes by an evaporimeter 4, a heater 5, the endless means that forced circulation pump 6 is formed, the thermal source that one-level two is imitated steam enrichment facility 2 heaters adopts one-level one to imitate the steam that steam enrichment facility 1 evaporimeter produces, the thermal source of secondary steam enrichment facility 3 heaters adopts one-level two to imitate the steam that steam enrichment facility 2 evaporimeters produce: one-level two is imitated the evaporimeter of steam enrichment facility, the evaporimeter of secondary steam enrichment facility all communicates with graphite condenser 7 and barometric condenser 8: step 2. in divided titanium dioxide from after acid solution imitate the steam enrichment facility by one-level one successively, one-level two is imitated the steam enrichment facility, secondary steam enrichment facility concentration, acid concentration is about 45% after one-level one is imitated the processing of steam enrichment facility, acid concentration is about 60% after one-level two is imitated the processing of steam enrichment facility, and acid concentration is about 65～70% after secondary steam enrichment facility concentration.One-level two is imitated the heater of steam enrichment facility, the heater of secondary steam enrichment facility all adopts the graphite block heat exchanger graphite heater of being made by polytetrafluoroethylene (PTFE) graphite piece material (adopting the form of Chinese patent: ZL01217384.3) (with the form of Chinese patent ZL97243307.4).
3. will handle in the concentrated acid solution input crystallization kettle after 2. step is handled, the crystallization kettle form that crystallization kettle adopts three series connection to be provided with, inorganic salts such as ferrous sulfate, calcium sulfate, magnesium sulfate crystallize into particle in the acid, form inorganic salts crystalline particle and sour mixed liquor, with pump mixed liquor is sent into press filtration processing in the mold pressing filter then, inorganic salts crystalline particle in the mixed liquor is separated with sulfuric acid, get the sulfuric acid that further concentrates, concentration reaches more than 70%, simultaneously inorganic salts in acid content less than 4%;
4. the concentrated vitriol liquid that will obtain after 3. step is handled is sent in the carborundum evaporimeter, and part moisture is removed in evaporation under negative pressure state, makes acid concentration reach 80～90%, this sulfuric acid can be back to the soda acid workshop section of production process of titanium pigment.
Claims (5)
1, the sulfur waste acid that produces in a kind of production process of titanium pigment, the recovery method of waste gas is characterized in that: comprise the following steps:
1. the stove waste gas and the sulfur waste acid that produce in the production process of titanium pigment sent into mixing in " titanium dioxide stove tail gas is carried dense dilute sulfuric acid graphite tower ", gas-liquid contact, concentrated, the stepping of going forward side by side is gone into gas-liquid separator, gas-liquid separation;
2. above-mentioned isolated spent acid liquid is sent into solid-liquid separator, with acid and the divided titanium dioxide that wherein contains from, the acid solution that obtains after the separation enters the steam concentration systems and carries out concentration;
3. handle in the concentrated acid solution input crystallization kettle that will be after 2. step is handled, form the mixed liquor of inorganic salts crystalline particle and acid, then inorganic salts crystalline particle in the mixed liquor be separated, the acid that further concentrates;
4. the concentrated acid solution that will obtain after 3. step is handled is sent in the carborundum evaporimeter, and part moisture is removed in evaporation under negative pressure state, makes acid concentration reach 80～90%, gets final product.
2, the sulfur waste acid that produces in the production process of titanium pigment according to claim 1, the recovery method of waste gas, it is characterized in that: the steam concentration systems has one-level one to imitate the steam enrichment facility, one-level one connects one-level two effect steam enrichment facilities after imitating the steam enrichment facility, connects secondary steam enrichment facility after one-level two is imitated the steam enrichment facilities; One-level one effect steam enrichment facility, one-level two are imitated the steam enrichment facilities, secondary steam enrichment facility includes by an evaporimeter, a heater, the endless means that forced circulation pump is formed, the thermal source that one-level two is imitated steam enrichment facility heater adopts one-level one to imitate the steam that steam enrichment facility evaporimeter produces, and the thermal source of secondary steam enrichment facility heater adopts one-level two to imitate the steam that steam enrichment facility evaporimeter produces; One-level two is imitated the evaporimeter of steam enrichment facility, the evaporimeter of secondary steam enrichment facility all communicates with graphite condenser and barometric condenser; Step 2. in divided titanium dioxide from after acid solution successively by one-level one imitate the steam enrichment facility, one-level two is imitated steam enrichment facilities, secondary steam enrichment facility concentration.
3, the sulfur waste acid that produces in the production process of titanium pigment according to claim 2, the recovery method of waste gas is characterized in that: one-level two is imitated the heater of steam enrichment facility, the heater of secondary steam enrichment facility all adopts the graphite block heat exchanger graphite heater of being made by polytetrafluoroethylene (PTFE) graphite piece material.
4, according to the sulfur waste acid that produces in claim 1, the 2 or 3 described production process of titanium pigment, the recovery method of waste gas, it is characterized in that: the crystallization kettle forms that the 3. middle crystallization kettle of step adopts three series connection to be provided with.
5, according to the sulfur waste acid that produces in claim 1, the 2 or 3 described production process of titanium pigment, the recovery method of waste gas, it is characterized in that: step 3. in from mixed liquor the method for separating inorganic salts crystalline particle be: with pump mixed liquor is sent in the mold pressing filter press filtration and handles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410041226 CN1262335C (en) | 2004-06-07 | 2004-06-07 | Method of recovering waste sulfuric acid and waste gas produced in tatanium dioxide production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410041226 CN1262335C (en) | 2004-06-07 | 2004-06-07 | Method of recovering waste sulfuric acid and waste gas produced in tatanium dioxide production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1608716A CN1608716A (en) | 2005-04-27 |
| CN1262335C true CN1262335C (en) | 2006-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410041226 Expired - Fee Related CN1262335C (en) | 2004-06-07 | 2004-06-07 | Method of recovering waste sulfuric acid and waste gas produced in tatanium dioxide production |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1330562C (en) * | 2005-06-30 | 2007-08-08 | 武汉方圆钛白粉有限责任公司 | Process of industrialize for waste acid concentrition recovering used in titanium white production by sulfuric acid method |
| CN100581994C (en) * | 2008-01-09 | 2010-01-20 | 龚家竹 | Concentrating and impurity removing method for dilute sulfuric acid in titanium dioxide powder production process by employing sulfuric acid process |
| CN101691210B (en) * | 2009-10-15 | 2011-08-31 | 武汉青江化工股份有限公司 | Method for concentrating titanium white waste acid by utilizing sulfuric-acid production tail gas |
| CN102730650B (en) * | 2011-04-12 | 2014-08-20 | 安徽理工大学 | Recovery technology of titanium white waste acid |
| CN103011272A (en) * | 2012-12-14 | 2013-04-03 | 四川龙蟒钛业股份有限公司 | Method for concentrating and purifying titanium dioxide waste acid by using complex acid |
| CN103708540B (en) * | 2013-12-27 | 2016-06-01 | 攀枝花东方钛业有限公司 | A kind of method of alkali lye recycle in production process of titanium pigment |
| CN106268179B (en) * | 2016-08-25 | 2018-09-07 | 长沙有色冶金设计研究院有限公司 | A kind of energy saving technique and system of synthetical recovery sulfuric acid purification spent acid |
| CN106215638B (en) * | 2016-09-23 | 2021-02-09 | 杭州东日节能技术有限公司 | Sulfur resource recycling process and device for sulfur-containing flue gas |
| CN107043092A (en) * | 2017-04-05 | 2017-08-15 | 珠海绿水环保科技有限公司 | A kind of energy-saving metallurgical recovery treatment method of waste acid and device |
| CN112573488A (en) * | 2020-10-12 | 2021-03-30 | 江苏荣信环保科技有限公司 | Metal product surface waste sulfuric acid treatment process |
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- 2004-06-07 CN CN 200410041226 patent/CN1262335C/en not_active Expired - Fee Related
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Assignee: Nantong Sansheng Graphite Equipment Technology Co., Ltd. Assignor: Feng Shengjun Contract fulfillment period: 2006.7.5 to 2012.7.4 contract change Contract record no.: 2008320000511 Denomination of invention: Method of recovering waste sulfuric acid and waste gas produced in tatanium dioxide production Granted publication date: 20060705 License type: Exclusive license Record date: 2008.10.6 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2006.7.5 TO 2012.7.4; CHANGE OF CONTRACT Name of requester: NANTONG SANSHENG GRAPHITE EQUIPMENT SCIENCE CO., L Effective date: 20081006 |
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