CN105771602A - Strong-oxidation absorption purification process for arsenic hydride containing waste gas - Google Patents
Strong-oxidation absorption purification process for arsenic hydride containing waste gas Download PDFInfo
- Publication number
- CN105771602A CN105771602A CN201610258529.2A CN201610258529A CN105771602A CN 105771602 A CN105771602 A CN 105771602A CN 201610258529 A CN201610258529 A CN 201610258529A CN 105771602 A CN105771602 A CN 105771602A
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- waste gas
- arsenic hydride
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- absorption tower
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/608—Sulfates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/55—Compounds of silicon, phosphorus, germanium or arsenic
- B01D2257/553—Compounds comprising hydrogen, e.g. silanes
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention discloses a strong-oxidation absorption purification process for an arsenic hydride containing waste gas. The strong-oxidation absorption purification process comprises the following steps: introducing the arsenic hydride containing waste gas into a sufficient amount of a mixed solution of Na2S2O8 and NaOH, and enalbing oxidation reduction reaction between arsenic hydride and Na2S2O8 and NaOH, thereby absorbing the arsenic hydride. Na2S2O8 and NaOH are common chemical raw materials which are low in purchase cost, and moreover, the mixed solution of Na2S2O8 and NaOH is easy to prepare, relatively high in security, relatively low in requirement on conditions such as temperature and pressure, and convenient to implement.
Description
Technical field
The present invention relates to industrial waste gas processing technology field, be specifically related to a kind of Strong oxdiative absorption cleaning technique containing arsenic hydride waste gas.
Background technology
Arsenic hydride (AsH3) is also called arsine, arsine, arsine, and for colourless hypertoxic gas, density is more than the density of air.Being mingled with the metallic ore of arsenic to meet can produce arsenic hydride with industrial sulphuric acid or hydrochloric acid, the ferrosilicon containing arsenic etc. is smelted and during storage, contacts humid air, or during with the slag of water quenching red-hot arsenic-containing ores, all can produce arsenic hydride.In order to avoid causing arseniasis event, can produce in the technological process of arsenic hydride at each, it is necessary to the strict discharge controlling arsenic hydride, prevent arsenic hydride from revealing, by the gas sampling containing arsenic hydride and process, reach the discharge standard of national regulation, just can discharge.
At present, the mode containing arsenic hydride waste gas that processes includes oxidative absorption method, if publication number is the patent of CN102389697A, and a kind of method describing wet cleaning arsenic hydride.The method uses chlorine and sodium hydroxide to be that fresh liquor natrii hypochloritis prepared by raw material, cost has bigger advantage, but the method needs the unstrpped gas chlorine used originally as toxic gas, transport and storage request is high, and equipment corrosion is serious, the liquor natrii hypochloritis additionally prepared needs to keep fresh, adds storage device, increases and implement difficulty.
Summary of the invention
It is an object of the invention to provide a kind of simple, convenient Strong oxdiative absorption cleaning technique containing arsenic hydride waste gas of enforcement, there is good clean-up effect, reduce exhaust-gas treatment cost simultaneously.
The object of the present invention is achieved like this: a kind of Strong oxdiative absorption cleaning technique containing arsenic hydride waste gas, and the waste gas containing arsenic hydride is passed into enough Na2S2O8Mixed solution with NaOH.
Further, following steps are specifically included:
A, by Na2S2O8With the mixed solution of NaOH as absorbent, pass into inside absorption tower from the top on absorption tower；
B, the waste gas containing arsenic hydride is passed into from the bottom on absorption tower, arsenic hydride in waste gas and O2And the Na in absorbent2S2O8, NaOH react, thus by arsenic hydride absorb.
Further, before step A, configure Na2S2O8With the mixed solution of NaOH, and be stored in reservoir；In step, feed pump is utilized to be delivered in absorption tower from reservoir by absorbent.
Further, reservoir is arranged at the bottom on absorption tower, and after step B, absorbent reenters reservoir after absorbing arsenic hydride, is repeated absorbing.
Further, arranging pressurized nozzles at top, absorption tower, and be arranged below impeller in pressurized nozzles, in step, after absorbent first passes through pressurized nozzles pressurization, the effect then through impeller is dispersed in absorption tower.
Further, absorption tower is multiple and is connected in series, and waste gas sequentially passes through multiple absorption tower, repeatedly purifies.
Further, it is provided with purification tank, before absorbent absorption arsenic hydride reaches capacity, absorbent is passed into purification tank, and purifies to purification tank addition Calx, then the absorbent after purifying is re-fed into reservoir.
Further, the waste gas after having purified is entered the high-altitude greater than or equal to 15m.
The invention has the beneficial effects as follows: waste gas passes into after in mixed solution, arsenic hydride is substantially carried out following reaction:
2AsH3+3O2→As2O3+3H2O
As2O3+2NaOH→2NaAsO2+H2O
AsH3+Na2As2O8+2NaOH→HAsO2+Na2SO4+Na2SO3+H2O
AsH3+2Na2As2O8+4NaOH→H3AsO4+2Na2SO4+2Na2SO3+2H2O
Thus arsenic hydride is removed.Na2S2O8With the industrial chemicals that NaOH is conventional, purchase cost is low；And Na2S2O8Configuring simple with the mixed solution of NaOH, safety is higher, and the requirement of the condition such as temperature, pressure is less, it is simple to implement.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of purifier of the present invention；
Accompanying drawing labelling: 1 absorption tower；11 pressurized nozzles；12 impellers；2 reservoirs；21 feed pumps；3 purification tanks；Filled arrows absorbs liquid flow direction；Hollow arrow exhaust gas flow direction.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further described.
As it is shown in figure 1, a kind of Strong oxdiative absorption cleaning technique containing arsenic hydride waste gas of the present invention, the waste gas containing arsenic hydride is passed into enough Na2S2O8Mixed solution with NaOH.
Utilize Na2S2O8The principle purifying waste gas with the mixed solution of NaOH is as follows:
2AsH3+3O2→As2O3+3H2O
As2O3+2NaOH→2NaAsO2+H2O
AsH3+Na2As2O8+2NaOH→HAsO2+Na2SO4+Na2SO3+H2O
AsH3+2Na2As2O8+4NaOH→H3AsO4+2Na2SO4+2Na2SO3+2H2O
Waste gas containing arsenic hydride just contains O2, therefore need not additionally add O2。Na2S2O8With NaOH as common industrial chemicals, with low cost, all soluble in water again, it is possible to configure the mixed solution of higher concentration, improve absorbance.Enough Na2S2O8Refer to according to above-mentioned chemical reaction with NaOH, according to the content of arsenic hydride in the waste gas passed into, it is determined that Na2S2O8Amount with NaOH, it is ensured that after reacting with arsenic hydride, Na2S2O8Residue is also had, to realize fully absorbing the purpose of arsenic hydride with NaOH.The above-mentioned chemical reaction that arsenic hydride participates in, reaction condition is gentle, it is not necessary to high temperature, high pressure or catalyst etc., easy to control, it is simple to implement.Additionally, also without solid precipitation or harmful gas in the product being obtained by reacting, new pollutant will not be produced, it is to avoid cause secondary pollution.
Directly waste gas can be passed into Na2S2O8With in the mixed solution of NaOH, in order to improve clean-up effect, purification process may particularly include following steps:
A, by Na2S2O8With the mixed solution of NaOH as absorbent, pass into absorption tower 1 from the top on absorption tower 1 internal；
B, the waste gas containing arsenic hydride is passed into from the bottom on absorption tower 1, arsenic hydride in waste gas and O2And the Na in absorbent2S2O8, NaOH react, thus by arsenic hydride absorb.Absorb liquid to move from top to bottom, and waste gas moves from bottom to top, both reverse contacts, mutually collides, and increases contact area and combined amount, it is prevented that portion is expelled directly out not past purification.
In order to purify with realizing continuous and automatic, before step A, configure Na2S2O8With the mixed solution of NaOH, and be stored in reservoir 2；In step, feed pump 21 is utilized to be delivered in absorption tower 1 from reservoir 2 by absorbent.
Owing in waste gas, the content of arsenic hydride is less, possibly together with substantial amounts of Na in the absorption liquid once absorbed2S2O8And NaOH, in order to make full use of absorption liquid, reducing cost of material, reservoir 2 is arranged at the bottom on absorption tower 1, and after step B, absorbent reenters reservoir 2 after absorbing arsenic hydride, is repeated absorbing.
In order to improve clean-up effect further, arranging pressurized nozzles 11 at top, absorption tower 1, and be arranged below impeller 12 in pressurized nozzles 11, in step, after absorbent first passes through pressurized nozzles 11 pressurization, the effect then through impeller 12 is dispersed in absorption tower 1.After absorption liquid first passes through pressurized nozzles 11 pressurization, then being broken up by impeller 12, be scattered in from top to bottom in whole absorption tower 1, what make entrance absorption tower 1 is fully contacted generation chemical reaction containing arsenic hydride waste gas with absorbing liquid, thus removing arsenic hydride more fully.Can increasing containing arsine gas flow velocity in absorption tower 1 it addition, impeller 12 rotates, thus aggravating air-flow and the turbulence intensity absorbed between liquid drop, improving the removal efficiency of arsenic hydride.
In order to further ensure that arsenic hydride is bottomed out removal, absorption tower 1 is multiple and is connected in series, and waste gas sequentially passes through multiple absorption tower 1, repeatedly purifies.Absorption tower 1 can arrange 3,4 etc., carries out repeatedly absorption cleaning by multiple absorption towers 1, and arsenic hydride substantially can be completely absorbed, and farthest reduces the discharge capacity of arsenic hydride.
Entering after the purified absorption of arsenic hydride in waste gas and absorb in liquid, by chemical reaction, most arsenic hydride is converted into AsO2 -1、AsO4 -3.Along with the accumulation of cyclic absorption time, absorb AsO in liquid2 -1、AsO4 -3Ion concentration increases, therefore, at set intervals, it is necessary to be replaced with without AsO2 -1、AsO4 -3Or AsO2 -1、AsO4 -3The absorption liquid that content is relatively low.It is provided with purification tank 3, absorbs before arsenic hydride reaches capacity at absorbent, absorbent is passed into purification tank 3, and add Calx to purification tank 3 and purify, then the absorbent after purifying is re-fed into reservoir 2.The reaction principle utilizing lime purification absorption liquid is as follows:
2AsO2 -1+Ca+2→ Ca(AsO2)2↓
2AsO4 -3+3Ca+2→Ca3(AsO4)2↓
Calx is with low cost, and unit price is far below Na2S2O8And NaOH, after above-mentioned reaction completes, filter out after waiting precipitate deposition or by precipitate, the absorption liquid after purifying is reused, it is possible to economize in raw materials cost further, it is to avoid waste；Meanwhile, a period of time, AsO have been absorbed2 -1、AsO4 -3Concentration higher absorption liquid be not needed as waste water and process, saved process equipment and expense.
In waste gas after purified, arsenic hydride content meets concerned countries standard, therefore, the waste gas after having purified can be entered the high-altitude greater than or equal to 15m, complete exhaust-gas treatment.When having building within the scope of radius 200m around aerofluxus, aerofluxus highly also should exceed most more than high constructure 3m.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (8)
1. the Strong oxdiative absorption cleaning technique containing arsenic hydride waste gas, it is characterised in that the waste gas containing arsenic hydride is passed into enough Na2S2O8Mixed solution with NaOH.
2. the Strong oxdiative absorption cleaning technique containing arsenic hydride waste gas, it is characterised in that specifically include following steps:
A, by Na2S2O8With the mixed solution of NaOH as absorbent, pass into absorption tower (1) from the top of absorption tower (1) internal；
B, the waste gas containing arsenic hydride is passed into from the bottom of absorption tower (1), arsenic hydride in waste gas and O2And the Na in absorbent2S2O8, NaOH react, thus by arsenic hydride absorb.
3. a kind of Strong oxdiative absorption cleaning technique containing arsenic hydride waste gas according to claim 2, it is characterised in that: before step A, configure Na2S2O8With the mixed solution of NaOH, and be stored in reservoir (2)；In step, feed pump (21) is utilized to be delivered in absorption tower (1) from reservoir (2) by absorbent.
4. a kind of Strong oxdiative absorption cleaning technique containing arsenic hydride waste gas according to claim 3, it is characterized in that: reservoir (2) is arranged at the bottom of absorption tower (1), after step B, absorbent enters reservoir (2) after absorbing arsenic hydride, is repeated absorbing.
5. a kind of Strong oxdiative absorption cleaning technique containing arsenic hydride waste gas according to claim 2,3 or 4, it is characterized in that: at absorption tower (1) top, pressurized nozzles (11) is set, and it is arranged below impeller (12) in pressurized nozzles (11), in step, after absorbent first passes through pressurized nozzles (11) pressurization, the effect then through impeller (12) is dispersed in absorption tower (1).
6. a kind of Strong oxdiative absorption cleaning technique containing arsenic hydride waste gas according to claim 5, it is characterised in that: absorption tower (1), for multiple and be connected in series, waste gas sequentially passes through multiple absorption tower (1), repeatedly purifies.
7. a kind of Strong oxdiative absorption cleaning technique containing arsenic hydride waste gas according to claim 4, it is characterized in that: be provided with purification tank (3), before absorbent absorption arsenic hydride reaches capacity, absorbent is passed into purification tank (3), and purify to purification tank (3) addition Calx, then the absorbent after purifying is re-fed into reservoir (2).
8. a kind of Strong oxdiative absorption cleaning technique containing arsenic hydride waste gas according to claim 1 to 7 any one claim, it is characterised in that: the waste gas after having purified is entered the high-altitude greater than or equal to 15m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610258529.2A CN105771602A (en) | 2016-04-25 | 2016-04-25 | Strong-oxidation absorption purification process for arsenic hydride containing waste gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610258529.2A CN105771602A (en) | 2016-04-25 | 2016-04-25 | Strong-oxidation absorption purification process for arsenic hydride containing waste gas |
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| CN105771602A true CN105771602A (en) | 2016-07-20 |
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| CN201610258529.2A Pending CN105771602A (en) | 2016-04-25 | 2016-04-25 | Strong-oxidation absorption purification process for arsenic hydride containing waste gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107051180A (en) * | 2017-03-01 | 2017-08-18 | 郑州大学 | A kind of absorbing medium of trace arsine gas and preparation method thereof, the detection means and detection method of trace arsine gas |
| CN112506158A (en) * | 2020-12-14 | 2021-03-16 | 云南煜锜环保科技有限公司 | Automatic mud phosphorus distillation temperature control system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03178317A (en) * | 1989-12-04 | 1991-08-02 | Iwatani Internatl Corp | Wet pollution-removing method for hydride-based waste gas |
| JP2007038113A (en) * | 2005-08-02 | 2007-02-15 | Kobe Steel Ltd | Organic arsenic compound-containing water treatment method |
| CN101550485A (en) * | 2008-04-02 | 2009-10-07 | 中国科学院过程工程研究所 | Oxidative pressure acid leaching method for processing purified waste residue in zinc hydrometallurgy process |
| CN102389697A (en) * | 2011-09-21 | 2012-03-28 | 昆明理工大学 | Method for removing arsenic hydride in tail gas of iron making blast furnace by wet process |
| CN103663779A (en) * | 2013-11-19 | 2014-03-26 | 苏州丹百利电子材料有限公司 | Method for safely and efficiently treating arsenic waste water generated from arsenic hydride production |
-
2016
- 2016-04-25 CN CN201610258529.2A patent/CN105771602A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03178317A (en) * | 1989-12-04 | 1991-08-02 | Iwatani Internatl Corp | Wet pollution-removing method for hydride-based waste gas |
| JP2007038113A (en) * | 2005-08-02 | 2007-02-15 | Kobe Steel Ltd | Organic arsenic compound-containing water treatment method |
| CN101550485A (en) * | 2008-04-02 | 2009-10-07 | 中国科学院过程工程研究所 | Oxidative pressure acid leaching method for processing purified waste residue in zinc hydrometallurgy process |
| CN102389697A (en) * | 2011-09-21 | 2012-03-28 | 昆明理工大学 | Method for removing arsenic hydride in tail gas of iron making blast furnace by wet process |
| CN103663779A (en) * | 2013-11-19 | 2014-03-26 | 苏州丹百利电子材料有限公司 | Method for safely and efficiently treating arsenic waste water generated from arsenic hydride production |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107051180A (en) * | 2017-03-01 | 2017-08-18 | 郑州大学 | A kind of absorbing medium of trace arsine gas and preparation method thereof, the detection means and detection method of trace arsine gas |
| CN107051180B (en) * | 2017-03-01 | 2019-06-07 | 郑州大学 | The detection device and detection method of a kind of absorbing medium of trace arsine gas and preparation method thereof, trace arsine gas |
| CN112506158A (en) * | 2020-12-14 | 2021-03-16 | 云南煜锜环保科技有限公司 | Automatic mud phosphorus distillation temperature control system |
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Application publication date: 20160720 |
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