CN216106007U - Process equipment for preparing sodium sulfate and hydrochloric acid from industrial waste salt - Google Patents
Process equipment for preparing sodium sulfate and hydrochloric acid from industrial waste salt Download PDFInfo
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- CN216106007U CN216106007U CN202122704561.8U CN202122704561U CN216106007U CN 216106007 U CN216106007 U CN 216106007U CN 202122704561 U CN202122704561 U CN 202122704561U CN 216106007 U CN216106007 U CN 216106007U
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Abstract
The utility model discloses process equipment for preparing sodium sulfate and hydrochloric acid from industrial waste salt, which comprises a pretreatment device, a reaction device and an impurity removal device; the pretreatment device comprises a first conveying device, a drying device, a second conveying device, a grinding device and a screening device; the reaction device comprises a reactor main body, the top of the reactor main body is provided with a waste salt feeding hole, a sulfuric acid feeding hole and a gas channel which are communicated with the reaction inner cavity, and the bottom of the reactor main body is provided with a discharging hole; the impurity removal device comprises an adsorption module, a pH adjusting module and a recrystallization module which are sequentially communicated. According to the utility model, through the organic combination of the pretreatment device, the reaction device and the impurity removal device, the synchronous production of two products of sodium sulfate crystals and hydrogen chloride is realized after the industrial waste salt and the sulfuric acid are heated and react, so that the recycling of hazardous wastes is realized.
Description
Technical Field
The utility model belongs to the field of hazardous waste treatment, and particularly relates to process equipment for preparing sodium sulfate and hydrochloric acid from industrial waste salt.
Background
Waste salt generated by typical industries such as pesticide, chemical industry, printing and dyeing and the like is typical hazardous waste, and the annual industrial waste salt produced in China is 2000 ten thousand tons. The waste salt discharge problem of the pesticide industry is the most prominent. 2500 pesticide enterprises are in total in China, and the total amount of pesticide production in China reaches 133 ten thousand tons in 2015, so that the agricultural production country is the first agricultural production country in the world. With the development of the pesticide industry, a remarkable number of difficult-to-degrade industrial waste salts are produced. Meanwhile, 92 ten thousand tons of fuel are produced in 2015 in China, the fuel accounts for 65% of the total amount of the whole world, the salt content of each ton of printing and dyeing wastewater reaches 5% -15%, and the industrial wastewater can generate a large amount of salty mud after sewage treatment.
The industrial waste salt has the characteristics of high salt and toxic and harmful organic matters, and meanwhile, the industrial waste salt can migrate along with soil and water to cause salinization of soil, and partial organic matters can enter the atmosphere along with atmospheric circulation and water circulation to form rainfall or surface runoff enters rivers and lakes to cause further pollution to threaten the health of human bodies and animals and plants.
At present, the main domestic waste salt treatment modes are landfill and incineration, and the waste salt is easy to dissolve in water, so that the existing treatment technologies such as landfill and the like are difficult to effectively implement, and the treatment technologies are easy to enter a dead cycle of 'repeated accumulation, repeated treatment and continuous accumulation' of high-salinity leachate; the waste salt is also easy to sublimate, so that the corrosion, the clogging and the like of heat treatment equipment are easily caused. In addition, the technology of treating industrial waste salt, such as fluidized bed technology, pyrolysis technology, multiple rotary evaporation recrystallization crystal purification technology and the like, has high cost and incomplete treatment, and the waste salt becomes an important bottleneck of the hazardous waste treatment industry due to the above factors.
At present, the prior art for treating industrial waste salt at home and abroad focuses on the high-temperature treatment direction, and removes harmful organic matters in the industrial waste salt through temperature rise treatment. However, a large amount of energy is consumed in a high-temperature treatment mode, alkali metal salt can corrode a hearth during high-temperature treatment, equipment maintenance loss is increased, the method is not an economic choice, meanwhile, different types of high-salt wastes have large ideal treatment temperature difference, and the types of waste salts in the prior art are single.
The method for preparing sodium sulfate from industrial waste salt and the hydrochloric acid method have high treatment efficiency, broad spectrum and resource and are in the direction of future development. The industrial waste salt and the waste sulfuric acid are treated by chemical heating, most of organic matters in the waste salt are degraded by using the sulfuric acid as a strong oxidant, the cost of activated carbon and macroporous resin for subsequently treating the organic matters in the waste salt is reduced, and meanwhile, the chemical heating process is low-temperature heating and does not need a large amount of energy consumption. Meanwhile, hydrogen chloride gas released in the reaction process of the waste salt and sulfuric acid can be used for preparing industrial hydrochloric acid, and the main component of the residual reaction liquid is sodium sulfate, and industrial sodium sulfate meeting the national standard can be obtained through adsorption and recrystallization. And the waste is consumed, and meanwhile, great economic benefits are generated.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provide process equipment for preparing sodium sulfate and hydrochloric acid from industrial waste salt.
The utility model adopts the following specific technical scheme:
the utility model provides process equipment for preparing sodium sulfate and hydrochloric acid from industrial waste salt, which comprises a pretreatment device, a reaction device and an impurity removal device;
the pretreatment device comprises a first conveying device, a drying device, a second conveying device, a grinding device and a screening device; the first conveying device is connected with the industrial waste salt to be treated and the drying device and is used for conveying the industrial waste salt to be treated into the drying device; the inlet of the drying device is connected with the discharge end of the first conveying device, and the outlet of the drying device is connected with the feed end of the second conveying device; the second conveying device is connected with the drying device and the grinding device and is used for conveying the industrial waste salt dried by the drying device to the grinding device; the inlet of the grinding device is connected with the discharge end of the second conveying device, the outlet of the grinding device is connected with the inlet of the screening device, and the industrial waste salt ground by the grinding device can enter the screening device to be screened;
the reaction device comprises a reactor main body; the reactor main body is a closed structure with a reaction inner cavity, a stirring device is arranged in the reactor main body, and a waste salt feeding hole, a sulfuric acid feeding hole and a gas channel which are communicated with the reaction inner cavity are formed in the top of the reactor main body; the outlet of the screening device is connected with the feed end of a third conveying device, the third conveying device is connected with the screening device and the waste salt feed inlet, and industrial waste salt treated by the screening device can enter the reactor main body through the waste salt feed inlet through the third conveying device; the gas channel is externally connected with a collecting device and is used for conveying the hydrogen chloride gas collected from the reaction cavity into the collecting device; the bottom of the reactor main body is provided with a discharge hole for discharging the residual reaction liquid in the reaction cavity;
the impurity removal device comprises an adsorption module, a pH adjusting module and a recrystallization module which are sequentially communicated; the discharge port is communicated with an inlet of an adsorption module through a first pipeline provided with a first valve and a first delivery pump, and the adsorption module is used for adsorbing organic matters in the residual reaction liquid; the outlet of the adsorption module is communicated with the inlet of the pH adjusting module through a second pipeline provided with a second valve and a second delivery pump, and the pH adjusting module is used for adjusting the pH value of the residual reaction liquid; the outlet of the pH adjusting module is communicated with the inlet of the recrystallization module through a third pipeline provided with a third valve and a third delivery pump, and the outlet of the recrystallization module is externally connected with a collecting device for collecting sodium sulfate crystals.
Preferably, the first transporting device, the second transporting device and the third transporting device are all belt conveyors.
Preferably, the drying device is a dryer.
Preferably, the grinding device is a ball mill.
Preferably, the screening device is a screening machine.
Preferably, the adsorption module is a cylinder filled with activated carbon or macroporous resin.
Preferably, the pH adjusting module and the recrystallization module are respectively a pH adjusting reaction kettle and a recrystallization reaction kettle.
Preferably, the reactor body is a reaction kettle with a heating device.
Preferably, the gas channel is externally connected with a nitrogen blowing device or a vacuum suction device.
Preferably, the waste salt feeding port, the sulfuric acid feeding port and the gas channel are provided with devices for controlling the opening and closing of the passages.
Compared with the prior art, the utility model has the following beneficial effects:
according to the utility model, through the organic combination of the pretreatment device, the reaction device and the impurity removal device, the synchronous production of two products of sodium sulfate crystals and hydrogen chloride is realized after the industrial waste salt and the sulfuric acid are heated and react, so that the recycling of hazardous wastes is realized. In order to better realize the resource utilization of industrial waste salt and waste sulfuric acid, the pretreated and homogenized waste sulfuric acid and waste salt are mixed in a liquid-solid ratio of 4:1-6:1, the mixture is heated at 80-120 ℃ for 40-80min, then the removal rate of chloride ions is improved to more than 95% in a nitrogen stripping or vacuum extraction mode, the reaction liquid enters an impurity removal system while industrial hydrochloric acid is obtained, and the reaction liquid is recrystallized after impurity removal to obtain three types of industrial anhydrous sodium sulfate meeting the national standard GB/T6009-2014 industrial anhydrous sodium sulfate standard and more than the three types of industrial anhydrous sodium sulfate.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is one implementation of the apparatus of the present invention;
FIG. 3 is a schematic flow chart of the process of using the apparatus of the present invention;
the reference numbers in the figures are: the device comprises a pretreatment device I, a reaction device II, an impurity removal device III, a first transportation device 11, a second transportation device 12, a third transportation device 13, a drying device 2, a grinding device 3, a screening device 4, a reactor main body 5, an adsorption module 6, a pH adjusting module 7, a recrystallization module 8, a first delivery pump 91, a second delivery pump 92, a third delivery pump 93, a first valve 101, a second valve 102 and a third valve 103.
Detailed Description
The utility model will be further elucidated and described with reference to the drawings and the detailed description. The technical features of the embodiments of the present invention can be combined correspondingly without mutual conflict.
The process equipment for preparing the sodium sulfate and the hydrochloric acid from the industrial waste salt can realize the preparation of the hydrochloric acid and the sodium sulfate from the industrial waste salt and the industrial waste sulfuric acid, wherein the industrial waste salt is high in chlorine sodium salt and low in organic matter content in the book '2016 edition' of national hazardous wastes, and mainly comes from the pesticide chemical industry. Industrial waste sulfuric acid is added into industrial waste salt, the sulfuric acid and inorganic chlorine react under the heating condition to generate hydrogen chloride gas so as to prepare industrial hydrochloric acid, and then sodium sulfate in the waste liquid is purified by activated carbon adsorption and recrystallization technologies so as to achieve the aim of recycling the industrial waste salt.
The apparatus of the present invention is suitable for treating all industrial waste salts, especially waste salts with low organic content (sodium chloride as the main component, total organic content < 10%). The main reason is that in the reaction process of the high organic matter waste salt and the sulfuric acid, the sulfuric acid preferentially consumes organic matters, and the reaction with sodium chloride is incomplete, so that the residual chlorine ions are excessive and the national standard requirements are difficult to meet, and therefore, the low organic matter waste salt is selected. Meanwhile, the industrial waste salt is dried and ground to 0.1-0.3mm, the reaction efficiency is improved by increasing the specific surface area, the reaction time is reduced, and the condition that the reaction is incomplete due to the occurrence of massive waste salt is avoided.
As shown in FIGS. 1 to 3, the process equipment of the present invention mainly comprises a pretreatment device I, a reaction device II and an impurity removal device III, and the structure and connection mode of each component will be specifically described below.
The pre-treatment device comprises a first transportation device 11, a drying device 2, a second transportation device 12, a grinding device 3 and a screening device 4. The first transport device 11 engages the industrial waste salt to be treated and the drying device 2 for transporting the industrial waste salt to be treated into the drying device 2. The inlet of the drying device 2 is connected with the discharge end of the first transportation device 11, and the outlet is connected with the feed end of the second transportation device 12. The expressions "engaging" and "connecting" and the like in the present invention mean that, taking the first transportation device 11 as an example, the first transportation device 11 does not necessarily need to be in mechanical contact with the drying device 2, as long as the material transported by the first transportation device 11 can enter the drying device 2 from the discharge end thereof, and for example, the material can be poured, connected and the like. In this embodiment, the first transportation device 11 may adopt a belt conveyor, and therefore, the inlet of the drying device 2 may be communicated with the tail portion of the first transportation device 11, or the inlet of the drying device 2 may be disposed below the tail portion of the first transportation device 11 to receive the material falling from the first transportation device 11.
The second transportation device 12 is connected with the drying device 2 and the grinding device 3, and is used for conveying the industrial waste salt dried by the drying device 2 to the grinding device 3. The import of grinder 3 is connected with the discharge end of second conveyer 12, and the export is connected with the import of screening plant 4, and the industry waste salt after grinder 3 grinds can get into screening plant 4 and realize the screening. The second transport device 12 may employ a belt conveyor.
In practical application, the industrial waste salt to be treated firstly enters a pretreatment device, and is subjected to drying, grinding and screening in sequence to realize homogenization treatment of the material, so that the subsequent treatment process is facilitated. In the embodiment, the industrial waste salt can be dried in the drying device 2 for 2-3h, so that the water content of the waste salt is lower than 5%; the industrial waste salt can be ground in a grinding device 3 to a particle size of 0.1-0.3mm, followed by sieving by a sieving device 4. The drying device 2 can adopt a dryer, the grinding device 3 can adopt a ball mill, and the screening device 4 can adopt a screening machine.
The reaction apparatus comprises a reactor body 5. Reactor main part 5 is for having the enclosed construction of reaction inner chamber, and inside is equipped with agitating unit, and the waste salt feed inlet, sulphuric acid feed inlet and the gas passage of seting up with reaction inner chamber intercommunication are all can set up the valve gear that can independent control place route switching to the switching condition of each route is adjusted as required to waste salt feed inlet, sulphuric acid feed inlet and gas passage. The sulfuric acid feed inlet is used for introducing waste sulfuric acid to be treated into the reaction cavity. Can set up nitrogen on the gas passage and blow device or vacuum suction device, external collection device blows device or vacuum suction device through nitrogen and collects hydrogen chloride gas in order following reaction inner chamber, send into collection device afterwards, can contain the absorption liquid in the collection device, absorb hydrogen chloride gas through the absorption liquid, and then obtain industrial hydrochloric acid goods. The hydrogen chloride gas is introduced into the absorption liquid by using a vacuum extraction or nitrogen stripping mode, mainly because the hydrogen chloride gas density is greater than the air density, the hydrogen chloride gas needs to be stripped to the absorption liquid by means of external force, otherwise, the hydrogen chloride gas is absorbed by the reaction liquid, and the chlorine ions cannot be effectively removed.
The outlet of the screening device 4 is connected with the feed end of the third conveying device 13, the third conveying device 13 is connected with the screening device 4 and the waste salt feed inlet, and industrial waste salt treated by the screening device 4 can enter the reactor main body 5 through the waste salt feed inlet through the third conveying device 13. The third transport device 13 may employ a belt conveyor. The bottom of the reactor main body 5 is provided with a discharge hole for discharging the residual reaction liquid in the reaction cavity.
In practical applications, the reactor main body 5 may be a reaction kettle having a heating device. In order to ensure that the industrial waste salt and the waste sulfuric acid can fully react in the reaction device, the liquid-solid ratio of the waste sulfuric acid and the industrial waste salt added into the reaction inner cavity can be controlled to be 4:1-6:1, the reaction time of the waste sulfuric acid and the industrial waste salt is 40-80min, and the reaction temperature is 80-120 ℃. The liquid-solid ratio of the waste sulfuric acid and the industrial waste salt is 4:1-6:1, and from the aspect of stoichiometry, the sulfuric acid can fully remove all chloride ions, and meanwhile, the reasonable liquid-solid ratio range can increase the reaction contact area, improve the reaction efficiency, and can not leave excessive waste sulfuric acid. After the waste sulfuric acid is added, the reaction is continued for 40-80min, so that the hydrogen chloride can be sufficiently evaporated from the reaction solution, and the original gas-liquid equilibrium state is broken.
The impurity removal device comprises an adsorption module 6, a pH adjusting module 7 and a recrystallization module 8 which are sequentially communicated. The discharge port is communicated with an inlet of the adsorption module 6 through a first pipeline provided with a first valve 101 and a first delivery pump 91, and the adsorption module 6 is used for adsorbing organic matters in the residual reaction liquid. The outlet of the adsorption module 6 is communicated with the inlet of the pH adjusting module 7 through a second pipeline provided with a second valve 102 and a second delivery pump 92, and the pH adjusting module 7 is used for adjusting the pH value of the residual reaction liquid. The outlet of the pH adjusting module 7 is communicated with the inlet of the recrystallization module 8 through a third pipeline provided with a third valve 103 and a third delivery pump 93, and the outlet of the recrystallization module 8 is externally connected with a collection device for collecting sodium sulfate crystals.
In practical application, the adsorption module 6 can be a column filled with activated carbon or macroporous resin, the pH adjustment module 7 can be a pH adjustment reaction kettle, and the recrystallization module 8 can be a recrystallization reaction kettle. The residual reaction solution in the reactor main body 5 adsorbs undegraded organic matters through macroporous resin or active carbon, precipitates metal cations by adjusting the pH to 7-9, and finally obtains sodium sulfate crystals through repeated recrystallization. The residual undegraded organic matters are absorbed by using the activated carbon particles and the macroporous resin, because the organic matters in the waste salt cannot be completely consumed by the sulfuric acid, organic matters still remain in the reaction liquid. The mode of activated carbon and macroporous resin adsorption can not bring secondary pollution to the reaction solution. At the same time, the pH of the reaction solution is adjusted to 7-9, and most of the cations such as Cu can be precipitated2+、Al3+、Fe3+。
Example 1
(1) Adding industrial waste salt with water content of 4% and granularity of 0.2mm after homogenizing treatment into a reactor main body, heating to 90 deg.C, adding 45% sulfuric acid at a liquid-solid ratio of 4:1, and reacting for 70min under heat preservation.
(2) And (3) introducing the generated hydrogen chloride gas into the absorption liquid of the collecting device in a nitrogen stripping mode in the reaction process to prepare a 30% hydrochloric acid solution.
(3) Adsorbing the reaction solution after reaction by macroporous resin organic matter, adjusting pH to 8, and recrystallizing the reaction solution to obtain sodium sulfate crystal, wherein Na is2SO4The content is 98.2 percent, which meets the standard of the second class and the first class of industrial anhydrous sodium sulfate.
Example 2
(1) Adding industrial waste salt with water content of 3% and granularity of 0.1mm after homogenizing treatment into a reactor main body, heating to 100 deg.C, adding 50% sulfuric acid at a liquid-solid ratio of 5:1, and reacting for 80min under heat preservation.
(2) And (3) introducing the generated hydrogen chloride gas into the absorption liquid of the collecting device in a nitrogen stripping mode in the reaction process to prepare a 30% hydrochloric acid solution.
(3) Adsorbing the reaction solution after reaction by macroporous resin organic matter, adjusting pH to 9, and recrystallizing the reaction solution to obtain sodium sulfate crystal, wherein Na is2SO4The content is 99.2 percent, which meets the standard of first-class products such as industrial anhydrous sodium sulfate.
Example 3
(1) Adding industrial waste salt with water content of 4% and granularity of 0.3mm after homogenizing treatment into a reactor main body, heating to 80 deg.C, adding 30% sulfuric acid at a liquid-solid ratio of 6:1, and reacting for 60min under heat preservation.
(2) And introducing the generated hydrogen chloride gas into the absorption liquid of the collecting device in a vacuum pumping mode in the reaction process to prepare a 30% hydrochloric acid solution.
(3) Organic matter adsorption is carried out on the reaction liquid after the reaction through active carbon, the pH is adjusted to 7, and then sodium sulfate crystals are obtained after the reaction liquid is recrystallized, wherein Na2SO4The content is 95.6 percent, which meets the standard of three classes of first-class products of industrial anhydrous sodium sulfate.
According to the utility model, through the organic combination of the pretreatment device, the reaction device and the impurity removal device, the synchronous production of two products of sodium sulfate crystals and hydrogen chloride is realized after the industrial waste salt and the sulfuric acid are heated and react, so that the recycling of hazardous wastes is realized.
The above-described embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the utility model. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, the technical scheme obtained by adopting the mode of equivalent replacement or equivalent transformation is within the protection scope of the utility model.
Claims (10)
1. A process unit for preparing sodium sulfate and hydrochloric acid from industrial waste salt is characterized by comprising a pretreatment device (I), a reaction device (II) and an impurity removal device (III);
the pretreatment device (I) comprises a first conveying device (11), a drying device (2), a second conveying device (12), a grinding device (3) and a screening device (4); the first transportation device (11) is connected with the industrial waste salt to be treated and the drying device (2) and is used for conveying the industrial waste salt to be treated into the drying device (2); the inlet of the drying device (2) is connected with the discharge end of the first conveying device (11), and the outlet of the drying device is connected with the feed end of the second conveying device (12); the second conveying device (12) is connected with the drying device (2) and the grinding device (3) and is used for conveying the industrial waste salt dried by the drying device (2) to the grinding device (3); an inlet of the grinding device (3) is connected with a discharge end of the second conveying device (12), an outlet of the grinding device is connected with an inlet of the screening device (4), and industrial waste salt ground by the grinding device (3) can enter the screening device (4) to be screened;
the reaction device (II) comprises a reactor body (5); the reactor main body (5) is a closed structure with a reaction inner cavity, a stirring device is arranged in the reactor main body, and a waste salt feeding hole, a sulfuric acid feeding hole and a gas channel which are communicated with the reaction inner cavity are formed in the top of the reactor main body; the outlet of the screening device (4) is connected with the feed end of a third conveying device (13), the third conveying device (13) is connected with the screening device (4) and a waste salt feed inlet, and industrial waste salt treated by the screening device (4) can enter the reactor main body (5) through the waste salt feed inlet through the third conveying device (13); the gas channel is externally connected with a collecting device and is used for conveying the hydrogen chloride gas collected from the reaction cavity into the collecting device; a discharge hole is formed in the bottom of the reactor main body (5) and used for discharging residual reaction liquid in the reaction cavity;
the impurity removal device (III) comprises an adsorption module (6), a pH adjusting module (7) and a recrystallization module (8) which are communicated in sequence; the discharge port is communicated with an inlet of an adsorption module (6) through a first pipeline provided with a first valve (101) and a first delivery pump (91), and the adsorption module (6) is used for adsorbing organic matters in the residual reaction liquid; an outlet of the adsorption module (6) is communicated with an inlet of the pH adjusting module (7) through a second pipeline provided with a second valve (102) and a second delivery pump (92), and the pH adjusting module (7) is used for adjusting the pH value of the residual reaction liquid; the outlet of the pH adjusting module (7) is communicated with the inlet of the recrystallization module (8) through a third pipeline provided with a third valve (103) and a third delivery pump (93), and the outlet of the recrystallization module (8) is externally connected with a collecting device for collecting sodium sulfate crystals.
2. The process equipment for preparing sodium sulfate and hydrochloric acid from industrial waste salt according to claim 1, characterized in that the first conveying device (11), the second conveying device (12) and the third conveying device (13) are belt conveyors.
3. The process equipment for preparing sodium sulfate and hydrochloric acid from industrial waste salt according to claim 1, characterized in that the drying device (2) is a dryer.
4. The process equipment for preparing sodium sulfate and hydrochloric acid from industrial waste salt according to claim 1, characterized in that the grinding device (3) is a ball mill.
5. The process equipment for preparing sodium sulfate and hydrochloric acid from industrial waste salt according to claim 1, characterized in that the screening device (4) is a screening machine.
6. The process equipment for preparing sodium sulfate and hydrochloric acid from industrial waste salt as claimed in claim 1, wherein the adsorption module (6) is a column filled with activated carbon or macroporous resin.
7. The process equipment for preparing sodium sulfate and hydrochloric acid from industrial waste salt as claimed in claim 1, wherein the pH adjusting module (7) and the recrystallization module (8) are respectively a pH adjusting reaction kettle and a recrystallization reaction kettle.
8. The process equipment for preparing sodium sulfate and hydrochloric acid from industrial waste salt according to claim 1, characterized in that the reactor main body (5) is a reaction kettle with a heating device.
9. The process equipment for preparing sodium sulfate and hydrochloric acid from industrial waste salt as claimed in claim 1, wherein the gas channel is externally connected with a nitrogen blowing device or a vacuum suction device.
10. The process equipment for preparing sodium sulfate and hydrochloric acid from industrial waste salt as claimed in claim 1, wherein the waste salt feeding port, the sulfuric acid feeding port and the gas channel are provided with devices for controlling the opening and closing of the passages.
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| CN115340069A (en) * | 2022-07-06 | 2022-11-15 | 宜宾海丰和锐有限公司 | Method for recycling byproduct hydrogen chloride containing organic matters |
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