CN114835309B - Waste salt recovery equipment and recovery method for chlor-alkali chemical production - Google Patents

Waste salt recovery equipment and recovery method for chlor-alkali chemical production Download PDF

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CN114835309B
CN114835309B CN202111578988.6A CN202111578988A CN114835309B CN 114835309 B CN114835309 B CN 114835309B CN 202111578988 A CN202111578988 A CN 202111578988A CN 114835309 B CN114835309 B CN 114835309B
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strong brine
auger
reaction kettle
waste salt
filter plate
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CN114835309A (en
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朱臻
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/76—Handling the filter cake in the filter for purposes other than for regenerating
    • B01D29/86—Retarding cake deposition on the filter during the filtration period, e.g. using stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/18—Stationary reactors having moving elements inside
    • B01J19/20—Stationary reactors having moving elements inside in the form of helices, e.g. screw reactors
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D3/00—Halides of sodium, potassium or alkali metals in general
    • C01D3/04—Chlorides
    • C01D3/08—Preparation by working up natural or industrial salt mixtures or siliceous minerals
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/4604—Treatment of water, waste water, or sewage by electrochemical methods for desalination of seawater or brackish water
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/12—Halogens or halogen-containing compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/20—Total organic carbon [TOC]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/04—Flow arrangements
    • C02F2301/043—Treatment of partial or bypass streams
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

The invention belongs to the technical field of chemical wastewater treatment, in particular to a waste salt recovery method for chlor-alkali chemical production, which comprises the following steps: s1, adding waste salt into a salt storage tank or a waste salt tank to dissolve into strong brine, then conveying the strong brine into an adjusting tank, and adding NaOH to adjust the PH of the strong brine in the adjusting tank to about 9; s2, then the strong brine enters an adsorption treatment assembly for filtration, and impurities (impurities in raw materials and precipitate generated under weak alkaline conditions, mainly removing calcium, magnesium and the like) of which the size is more than 0.1 mu m in the strong brine are completely removed; s3, the concentrated brine enters an electrochemical reactor, and TOC in the concentrated brine is reduced to below 5mg/L through cyclic oxidation reaction. The adsorbent in the invention can continuously turn over the inside of the reaction kettle, and can avoid the adsorbent from accumulating above the filter plate, thereby preventing the condition that the adsorbent blocks the filter plate and ensuring that the circulation of chemical wastewater is not influenced.

Description

Waste salt recovery equipment and recovery method for chlor-alkali chemical production
Technical Field
The invention relates to the technical field of chemical wastewater treatment, in particular to waste salt recovery equipment and a recovery method for chlor-alkali chemical production.
Background
The chlorine alkali industry quality of water is complicated, hardness and soluble salt's content in the water are higher, get rid of and have certain degree of difficulty, hard water is as the cooling water of industrial production usefulness, can make the heat exchanger scale, serious not only can hinder the rivers passageway, make the heat exchange effect greatly reduced, influence the smooth going on of production, even be forced to stop production, the scale deposit can also produce under-scale corruption, can make the heat exchanger perforation and damage, not only the material leakage, and increase equipment investment cost, waste steel, high concentration contains salt water can not only produce the erosion to equipment, cause equipment life's shortening, and can seriously influence the quality of reuse water, make reuse water can not reach the quality requirement of production technology water, influence the quality of production product, and the chlorine alkali can produce the waste water that is abundant in sodium peroxide in the course of processing production, the waste water direct discharge of production, not only can cause the waste of resource, but also can produce certain pollution to the environment.
At present, in the process of taking out organic matters in chemical wastewater through the adsorbent, the adsorbent cannot be fully contacted with the chemical wastewater, so that the efficiency of adsorbing residual organic matters by the adsorbent is reduced, and the accumulated adsorbent also easily causes the abnormal circulation of the chemical wastewater.
Therefore, we propose a waste salt recovery apparatus for chlor-alkali chemical production and a recovery method thereof for solving the above problems.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides waste salt recovery equipment and a recovery method for chlor-alkali chemical production.
In order to achieve the above purpose, the present invention adopts the following technical scheme: a method for recovering waste salt used for chlor-alkali chemical production comprises the following steps:
s1, adding waste salt into a salt storage tank or a waste salt tank to dissolve into strong brine, then conveying the strong brine into an adjusting tank, and adding NaOH to adjust the PH of the strong brine in the adjusting tank to about 9;
s2, then, the strong brine enters an adsorption treatment assembly for filtration, and impurities (impurities in raw materials and precipitate generated under weak alkaline conditions, mainly removing calcium, magnesium and the like) of which the size is more than 0.1 mu m in the strong brine are completely removed;
s3, then the strong brine enters an electrochemical reactor, TOC in the strong brine is reduced to below 5mg/L through a cyclic oxidation reaction, then the strong brine enters a plurality of groups of resin adsorbers for adsorption (which can be connected in parallel or in series), ions such as iodine, strontium, barium, aluminum, silicon and the like are removed, and meanwhile HCI is added into the resin adsorbers for reaction with the strong brine;
s4, separating out Na2SO4, naCL and other impurity salts from the concentrated brine, and enabling the NaCL to enter a recycling pool and reenter a production system for reciprocating utilization.
A waste salt recovery plant for chlor-alkali chemical production, including foretell adsorption treatment subassembly, adsorption treatment subassembly includes reation kettle, reation kettle's bottom movable mounting has the filter, the top of filter is equipped with the adsorbent that is arranged in adsorbing organic matter in the strong brine, the auger of increase adsorbent and strong brine area of contact is installed in the top rotation of filter, rotate the cover on the auger and be equipped with the pipeline that stirs strong brine motion.
Preferably, the conveying pipeline comprises a reticular cylinder, an agitating blade is fixedly sleeved on the reticular cylinder, the auger penetrates through the reticular cylinder and is rotationally connected with the inner wall of the reticular cylinder, a connecting support is fixedly arranged at the top of the reticular cylinder, and the connecting support is sleeved on the auger.
Preferably, the connecting support comprises a reverse transmission assembly fixedly sleeved on the auger, the reverse transmission assembly comprises an annular gear frame, three planet gears are meshed in the annular gear frame, the same sun gear is meshed among the three planet gears, the auger penetrates through the sun gear and is fixedly connected with the sun gear, two vertical rods are rotatably installed at the top of the annular gear frame in an annular mode, the top ends of the two vertical rods are fixedly connected with the inner wall of the top of the reaction kettle, four L-shaped rods which are distributed circularly are fixedly installed at the outer edge of the annular gear frame, and the bottom ends of the four L-shaped rods are fixedly connected with the top of the reticular cylinder.
Preferably, the auger includes pivot and fixed cover and establishes in the epaxial flight of pivot, the bottom movable mounting of pivot scrapes and sweeps the subassembly, scrape and sweep the subassembly and include fixed connection's drum and two scrapers together, two scrapers are semi-circular and two scrapers are central symmetry and distribute.
Preferably, two symmetrically distributed arc grooves are formed in the rotating shaft, two symmetrically distributed limiting blocks are fixedly arranged on the inner wall of the cylinder, elastic gaskets are fixedly arranged on the inner walls of the two sides of the arc grooves, the two limiting blocks are respectively connected with the inner walls of the corresponding arc grooves in a sliding mode, and the two sides of the limiting blocks are respectively abutted against the corresponding elastic gaskets.
Preferably, the elastic gasket comprises two arc-shaped plates, and the same wavy elastic sheet is fixedly arranged between the two arc-shaped plates.
Preferably, the bottom fixed mounting of filter has a plurality of branches that are circular distribution, and the bottom of a plurality of branches is in the same place with reation kettle's bottom inner wall fixed connection, the bottom fixed mounting of filter has the row material pipe of taking the valve, row material pipe runs through the filter plate, and row material pipe keep away from the one end of filter and extend outside the reation kettle and be in the same place with reation kettle sealing connection, the charge door has been seted up to one side of reation kettle, charge door and feed liquor pipe are in the coplanar.
Preferably, the top fixed mounting of reation kettle has the motor, the output shaft of motor extends to in the reation kettle and is in the same place through the shaft coupling with the auger, reation kettle's bottom is equipped with the drain pipe, one side of reation kettle is equipped with the feed liquor pipe.
Preferably, the top of reation kettle is equipped with the admission pipe, the admission pipe runs through reation kettle and is in the same place with reation kettle fixed connection, the top screw thread of admission pipe installs the lid.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention enables the adsorbent to fully contact with the chemical wastewater by continuously turning over the adsorbent, thereby improving the efficiency of the adsorbent for adsorbing residual organic matters in the chemical wastewater;
2. the adsorbent in the invention can continuously turn over the inside of the reaction kettle, and can avoid the adsorbent from accumulating above the filter plate, thereby preventing the condition that the adsorbent blocks the filter plate and ensuring that the circulation of chemical wastewater is not influenced.
Drawings
FIG. 1 is a schematic diagram of a method for recovering waste salt in chlor-alkali chemical production;
FIG. 2 is a side sectional view of an adsorption treatment assembly in a waste salt recovery device for chlor-alkali chemical production according to the present invention;
FIG. 3 is a schematic structural view of an auger, a conveying pipeline, a scraping and sweeping assembly and a connecting bracket in waste salt recovery equipment for chlor-alkali chemical production;
FIG. 4 is a schematic view of a partial enlarged structure in FIG. 3;
FIG. 5 is a schematic diagram of the auger and the scraping assembly in the waste salt recovery device for chlor-alkali chemical production;
FIG. 6 is an enlarged schematic view of the portion A in FIG. 5;
FIG. 7 is a schematic diagram of the structure of an elastic gasket in a waste salt recovery device for chlor-alkali chemical production;
FIG. 8 is a schematic diagram of a part of the structure of a middle adsorption treatment assembly of a waste salt recovery device for chlor-alkali chemical production; a step of
Fig. 9 is an exploded view of a reverse drive assembly in a waste salt recovery apparatus for chlor-alkali chemical production according to the present invention.
In the figure: 1. an adsorption treatment assembly; 11. a reaction kettle; 12. a liquid inlet pipe; 13. a liquid outlet pipe; 14. a filter plate; 141. a support rod; 142. a discharge pipe; 15. an auger; 151. a rotating shaft; 152. a spiral sheet; 153. an arc-shaped groove; 154. an elastic pad; 1541. an arc-shaped plate; 1542. a wave-shaped elastic sheet; 16. a motor; 17. a delivery conduit; 171. a mesh drum; 172. stirring paddles; 18. a scraping assembly; 181. a cylinder; 182. a scraper; 183. a limiting block; 19. a connecting bracket; 191. a reverse drive assembly; 1911. an inner gear ring frame; 1912. a planet wheel; 1913. a sun gear; 1914. a vertical rod; 192. an L-shaped rod; 110. into the tube.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
Referring to fig. 1-9, a method for recovering waste salt used for chlor-alkali chemical production is provided in this embodiment, which includes the following steps:
s1, adding waste salt into a salt storage tank or a waste salt tank to dissolve into strong brine, then conveying the strong brine into an adjusting tank, and adding NaOH to adjust the PH of the strong brine in the adjusting tank to about 9;
s2, then, the strong brine enters an adsorption treatment assembly 1 for filtration, and impurities (impurities in raw materials and precipitate generated under weak alkaline conditions, mainly removing calcium, magnesium and the like) above 0.1 mu m in the strong brine are completely removed;
s3, then the strong brine enters an electrochemical reactor, TOC in the strong brine is reduced to below 5mg/L through a cyclic oxidation reaction, then the strong brine enters a plurality of groups of resin adsorbers for adsorption (which can be connected in parallel or in series), ions such as iodine, strontium, barium, aluminum, silicon and the like are removed, and meanwhile HCI is added into the resin adsorbers for reaction with the strong brine;
s4, separating out Na2SO4, naCL and other impurity salts from the concentrated brine, and enabling the NaCL to enter a recycling pool and reenter a production system for reciprocating utilization.
A waste salt recovery plant for chlor-alkali chemical production, including foretell adsorption treatment subassembly 1, adsorption treatment subassembly 1 includes reation kettle 11, and reation kettle 11's bottom movable mounting has filter 14, and the top of filter 14 is equipped with the adsorbent that is arranged in adsorbing organic matter in the strong brine, and auger 15 of increase adsorbent and strong brine area of contact is installed in the top rotation of filter 14, rotates the cover on the auger 15 and is equipped with the pipeline 17 that stirs strong brine motion.
The conveying pipeline 17 comprises a net-shaped cylinder 171, stirring paddles 172 are fixedly sleeved on the net-shaped cylinder 171, the auger 15 penetrates through the net-shaped cylinder 171 and is rotationally connected with the inner wall of the net-shaped cylinder 171, a connecting support 19 is fixedly mounted on the top of the net-shaped cylinder 171, and the connecting support 19 is sleeved on the auger 15.
Specifically, the packing auger 15 that rotates in the netted section of thick bamboo 171 can pump the adsorbent of bottom to the inside top of reation kettle 11 from the bottom of reation kettle 11 for the adsorbent can be with the continuous roll-over in the reation kettle 11, can avoid the adsorbent to pile up in the top of filter 14, not only can prevent that the condition that the filter 14 was blockked up to the adsorbent from appearing, can make the adsorbent can be abundant with strong brine contact together simultaneously, and the lateral wall of netted section of thick bamboo 171 is not closed state, also can be abundant contact with strong brine when the in-process of adsorbent flow through netted section of thick bamboo 171.
The connecting support 19 comprises a reverse transmission assembly 191 fixedly sleeved on the auger 15, the reverse transmission assembly 191 comprises an annular gear frame 1911, three planet gears 1912 are meshed in the annular gear frame 1911, the same sun gear 1913 is meshed among the three planet gears 1912, the auger 15 penetrates through the sun gear 1913 and is fixedly connected with the sun gear 1913, two upright rods 1914 are installed on the top of the annular gear frame 1911 in a circular mode, the top ends of the two upright rods 1914 are fixedly connected with the inner wall of the top of the reaction kettle 11, four L-shaped rods 192 which are distributed circularly are fixedly installed on the outer edge of the annular gear frame 1911, and the bottom ends of the four L-shaped rods 192 are fixedly connected with the top of the net-shaped barrel 171.
Specifically, through setting up linking bridge 19, can make auger 15 and the rotation opposite of netted section of thick bamboo 171 to in the absorbent of auger 15 with reation kettle 11 bottom was carried into netted section of thick bamboo 171 of being convenient for, along with the continuous rotation of auger 15, make the absorbent can follow the top of netted section of thick bamboo 171 and discharge, thereby make the absorbent can fully contact with the strong brine in the reation kettle 11.
Auger 15 includes pivot 151 and fixed cover establishes in pivot 151's flight 152, and pivot 151's bottom movable mounting scrapes and sweeps subassembly 18, scrapes and sweeps subassembly 18 and includes cylinder 181 and two scraping plates 182 that fixed connection is in the same place, and two scraping plates 182 are semi-circular and two scraping plates 182 are central symmetry and distribute.
Specifically, the two semicircular scraping plates 182 synchronously rotate along the rotating shaft 151, so that the adsorbent on the filter plate 14 can be continuously gathered to the center of the circle, and the bottom of the spiral sheet 152 can be completely immersed in the adsorbent, so that the adsorbent below the reaction kettle 11 can be conveyed to the upper part of the reaction kettle 11 along with the continuous rotation of the rotating shaft 151 and the spiral sheet 152, and the adsorbent can be fully contacted with strong brine.
Two symmetrically-distributed arc grooves 153 are formed in the rotating shaft 151, two symmetrically-distributed limiting blocks 183 are fixedly mounted on the inner wall of the cylinder 181, elastic gaskets 154 are fixedly mounted on the inner walls of two sides of the arc grooves 153, the two limiting blocks 183 are respectively connected with the inner walls of the corresponding arc grooves 153 in a sliding mode, and two sides of the limiting blocks 183 are respectively abutted against the corresponding elastic gaskets 154.
Specifically, through two stopper 183 swing joint in two arc grooves 153, can make at the moment that auger 15 starts scrape and sweep the subassembly 18 and have a buffering process, avoid scraping and sweep the subassembly 18 and receive the high moment of torsion and appear deformation fracture's condition in a moment, prolonged and scrape the life who sweeps the subassembly 18.
The elastic pad 154 comprises two arc plates 1541, and the same wavy elastic sheet 1542 is fixedly arranged between the two arc plates 1541.
Specifically, when the limiting block 183 moves in the arc-shaped groove 153, one of the elastic gaskets 154 is extruded, and the elastic gasket 154 is deformed by the extrusion process, the two arc-shaped plates 1541 extrude the wavy elastic sheet 1542, so that the buffer process exists between the scraping assembly 18 and the auger 15 at the moment of starting the rotating shaft 151, and hard contact between the auger 15 and the scraping assembly 18 is avoided.
The bottom fixed mounting of filter 14 has a plurality of branches 141 that are circular distribution, and the bottom of a plurality of branches 141 is in the same place with the bottom inner wall fixed connection of reation kettle 11, and the bottom fixed mounting of filter 14 has the row material pipe 142 of taking the valve, arranges material pipe 142 and runs through filter 14, and arranges the one end that material pipe 142 kept away from filter 14 extends outside reation kettle 11 and with reation kettle 11 sealing connection together, and the charge door has been seted up to one side of reation kettle 11, and charge door and feed liquor pipe 12 are in the coplanar.
Specifically, the adsorbent in the reaction kettle 11 can be removed through the discharge pipe 142, meanwhile, the rotating scraping and sweeping assembly 18 can gather the adsorbent to the center of the filter plate 14 and fall into the discharge pipe 142, and then the adsorbent can be completely discharged by opening a valve on the discharge pipe 142.
The top fixed mounting of reation kettle 11 has motor 16, and the output shaft of motor 16 extends to reation kettle 11 and is in the same place through the shaft coupling with auger 15, and reation kettle 11's bottom is equipped with drain pipe 13, and one side of reation kettle 11 is equipped with feed liquor pipe 12.
The top of the reaction kettle 11 is provided with an inlet pipe 110, the inlet pipe 110 penetrates through the reaction kettle 11 and is fixedly connected with the reaction kettle 11, and a cover is arranged on the top of the inlet pipe 110 in a threaded manner.
Specifically, HCL is injected into the reaction kettle 11 through the inlet pipe 110, and the HCL can react with the HCL when the strong brine enters the reaction kettle 11, so that the strong brine can be fully oxidized, and the precipitant is convenient to adsorb out the participating organic matters in the strong brine.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims (3)

1. The waste salt recovery method for chlor-alkali chemical production is characterized by comprising the following steps of:
s1, adding waste salt into a salt storage tank or a waste salt tank to dissolve into strong brine, then conveying the strong brine into an adjusting tank, and adding NaOH to adjust the pH of the strong brine in the adjusting tank to about 9;
s2, then the strong brine enters an adsorption treatment assembly (1) for filtering, and impurities above 0.1 mu m in the strong brine are removed completely;
s3, then the strong brine enters an electrochemical reactor, TOC in the strong brine is reduced to below 5mg/L through a cyclic oxidation reaction, then the strong brine enters a plurality of groups of resin adsorbers for adsorption, ions such as iodine, strontium, barium, aluminum and silicon are removed, and meanwhile HCI is added into the resin adsorbers for reaction with the strong brine;
s4, separating out and drying the concentrated brine to separate out Na 2 SO 4 NaCl and other miscellaneous salts, and the NaCl enters a recycling tank and reenters a production system for reciprocating utilization;
the adsorption treatment assembly (1) comprises a reaction kettle (11), a filter plate (14) is movably arranged at the bottom of the reaction kettle (11), an adsorbent for adsorbing organic matters in strong brine is arranged above the filter plate (14), a packing auger (15) for increasing the contact area between the adsorbent and the strong brine is rotatably arranged above the filter plate (14), and a conveying pipeline (17) for stirring the strong brine is rotatably sleeved on the packing auger (15);
the conveying pipeline (17) comprises a mesh cylinder (171), stirring paddles (172) are fixedly sleeved on the mesh cylinder (171), the auger (15) penetrates through the mesh cylinder (171) and is rotationally connected with the inner wall of the mesh cylinder (171), a connecting bracket (19) is fixedly arranged at the top of the mesh cylinder (171), and the connecting bracket (19) is sleeved on the auger (15);
the connecting support (19) comprises a reverse transmission assembly (191) fixedly sleeved on the auger (15), the reverse transmission assembly (191) comprises an annular gear frame (1911), three planet gears (1912) are meshed in the annular gear frame (1911), the same sun gear (1913) is meshed among the three planet gears (1912), the auger (15) penetrates through the sun gear (1913) and is fixedly connected with the sun gear (1913), two vertical rods (1914) are annularly arranged at the top of the annular gear frame (1911) in a rotating mode, the top ends of the two vertical rods (1914) are fixedly connected with the inner wall of the top of the reaction kettle (11), four L-shaped rods (192) which are distributed circularly are fixedly arranged at the outer edge of the annular gear frame (1911), and the bottom ends of the four L-shaped rods (192) are fixedly connected with the top of the reticular cylinder (171);
the auger (15) comprises a rotating shaft (151) and a spiral sheet (152) fixedly sleeved on the rotating shaft (151), a scraping component (18) is movably mounted at the bottom end of the rotating shaft (151), the scraping component (18) comprises a cylinder (181) and two scraping plates (182) which are fixedly connected together, the two scraping plates (182) are semicircular, and the two scraping plates (182) are distributed in a central symmetry manner;
two symmetrically-distributed arc grooves (153) are formed in the rotating shaft (151), two symmetrically-distributed limiting blocks (183) are fixedly arranged on the inner wall of the cylinder (181), elastic gaskets (154) are fixedly arranged on the inner walls of the two sides of the arc grooves (153), the two limiting blocks (183) are respectively connected with the inner walls of the corresponding arc grooves (153) in a sliding mode, and the two sides of the limiting blocks (183) are respectively abutted against the corresponding elastic gaskets (154);
the elastic gasket (154) comprises two arc-shaped plates (1541), and the same wavy elastic sheet (1542) is fixedly arranged between the two arc-shaped plates (1541);
the top fixed mounting of reation kettle (11) has motor (16), the output shaft of motor (16) extends to reation kettle (11) in and link together through the shaft coupling with auger (15), the bottom of reation kettle (11) is equipped with drain pipe (13), one side of reation kettle (11) is equipped with feed liquor pipe (12).
2. The method for recycling the waste salt for chlor-alkali chemical production according to claim 1, wherein a plurality of circularly distributed supporting rods (141) are fixedly arranged at the bottom of the filter plate (14), the bottom ends of the supporting rods (141) are fixedly connected with the inner wall of the bottom of the reaction kettle (11), a discharging pipe (142) with a valve is fixedly arranged at the bottom of the filter plate (14), the discharging pipe (142) penetrates through the filter plate (14), one end, far away from the filter plate (14), of the discharging pipe (142) extends out of the reaction kettle (11) and is connected with the reaction kettle (11) in a sealing mode, a feeding opening is formed in one side of the reaction kettle (11), and the feeding opening and the liquid inlet pipe (12) are located on the same plane.
3. The method for recycling waste salt used for chlor-alkali chemical production according to claim 1, wherein an inlet pipe (110) is arranged at the top of the reaction kettle (11), the inlet pipe (110) penetrates through the reaction kettle (11) and is fixedly connected with the reaction kettle (11), and a cover is arranged on the top of the inlet pipe (110) in a threaded manner.
CN202111578988.6A 2021-12-22 2021-12-22 Waste salt recovery equipment and recovery method for chlor-alkali chemical production Active CN114835309B (en)

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