CN115180764A - Wastewater treatment process for polycrystalline silicon industry - Google Patents
Wastewater treatment process for polycrystalline silicon industry Download PDFInfo
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- CN115180764A CN115180764A CN202210966130.5A CN202210966130A CN115180764A CN 115180764 A CN115180764 A CN 115180764A CN 202210966130 A CN202210966130 A CN 202210966130A CN 115180764 A CN115180764 A CN 115180764A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 32
- 229910021420 polycrystalline silicon Inorganic materials 0.000 title claims abstract description 29
- 239000002351 wastewater Substances 0.000 claims abstract description 260
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 130
- 239000011575 calcium Substances 0.000 claims abstract description 130
- 238000002425 crystallisation Methods 0.000 claims abstract description 118
- 230000008025 crystallization Effects 0.000 claims abstract description 118
- 239000011734 sodium Substances 0.000 claims abstract description 118
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 118
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 116
- 150000003839 salts Chemical class 0.000 claims abstract description 80
- 239000007788 liquid Substances 0.000 claims abstract description 69
- 239000013078 crystal Substances 0.000 claims abstract description 68
- 239000011780 sodium chloride Substances 0.000 claims abstract description 58
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 26
- 239000001110 calcium chloride Substances 0.000 claims abstract description 26
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 26
- 229920005591 polysilicon Polymers 0.000 claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000011343 solid material Substances 0.000 claims abstract description 15
- 239000012535 impurity Substances 0.000 claims abstract description 11
- 238000000926 separation method Methods 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 5
- 238000001704 evaporation Methods 0.000 claims abstract description 3
- 230000008020 evaporation Effects 0.000 claims abstract description 3
- 238000005406 washing Methods 0.000 claims description 50
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 claims description 17
- 229910001626 barium chloride Inorganic materials 0.000 claims description 17
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000002244 precipitate Substances 0.000 claims description 15
- 239000002002 slurry Substances 0.000 claims description 15
- 238000007790 scraping Methods 0.000 claims description 13
- 239000000243 solution Substances 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 10
- 150000002500 ions Chemical class 0.000 claims description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- 229910001385 heavy metal Inorganic materials 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 6
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 6
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 claims description 6
- 229910001422 barium ion Inorganic materials 0.000 claims description 6
- 229910001424 calcium ion Inorganic materials 0.000 claims description 6
- 239000010413 mother solution Substances 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- 239000008394 flocculating agent Substances 0.000 claims description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 claims description 3
- 239000003814 drug Substances 0.000 claims description 2
- 238000001035 drying Methods 0.000 claims description 2
- 238000005189 flocculation Methods 0.000 claims description 2
- 230000016615 flocculation Effects 0.000 claims description 2
- 238000004064 recycling Methods 0.000 claims 1
- 238000005119 centrifugation Methods 0.000 abstract description 13
- 239000010865 sewage Substances 0.000 abstract description 8
- 239000012452 mother liquor Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 18
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 16
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 15
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 7
- 238000007664 blowing Methods 0.000 description 7
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 description 5
- 235000011152 sodium sulphate Nutrition 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 239000012047 saturated solution Substances 0.000 description 4
- 239000005046 Chlorosilane Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- KOPOQZFJUQMUML-UHFFFAOYSA-N chlorosilane Chemical compound Cl[SiH3] KOPOQZFJUQMUML-UHFFFAOYSA-N 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 2
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000001471 micro-filtration Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 101100293261 Mus musculus Naa15 gene Proteins 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- SLLGVCUQYRMELA-UHFFFAOYSA-N chlorosilicon Chemical compound Cl[Si] SLLGVCUQYRMELA-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Images
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
-
- 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
- C01D3/06—Preparation by working up brines; seawater or spent lyes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/20—Halides
- C01F11/24—Chlorides
-
- 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
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/041—Treatment of water, waste water, or sewage by heating by distillation or evaporation by means of vapour compression
-
- 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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F2001/5218—Crystallization
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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
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- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
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- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The application relates to a wastewater treatment process in the polysilicon industry, which belongs to the technical field of wastewater treatment and comprises the following steps: high-calcium wastewater is subjected to evaporation concentration and high-temperature crystallization in sequence to obtain high-calcium wastewater crystallization clear liquid and high-calcium wastewater crystallization crystal mush, the high-calcium wastewater crystallization clear liquid is processed by a flaker to produce calcium chloride containing crystal water, the high-calcium wastewater crystallization crystal mush is centrifuged and separated to obtain high-calcium wastewater centrifugation mother liquor and high-calcium wastewater centrifugation wet solid material, the high-calcium wastewater centrifugation wet solid material is dried to produce sodium chloride, and the high-calcium wastewater centrifugation mother liquor is recycled for high-temperature crystallization until the separation amount of the high-calcium wastewater centrifugation wet solid material is close to zero; and (3) sequentially carrying out the steps of salt conversion, chemical adding and impurity removal, and evaporative crystallization on the high-sodium wastewater to finally produce sodium chloride. This application can carry out waste utilization to the ionic resource in the waste water, has the effect that reduces sewage treatment center burden, reduces the whole adult of waste water treatment.
Description
Technical Field
The application relates to the field of wastewater treatment, in particular to a wastewater treatment process in the polysilicon industry.
Background
Polycrystalline silicon materials are the most prominent photovoltaic materials, and are used mostly in semiconductors and solar cells. The tail gas from the production of polysilicon mainly contains a large amount of HCl, chlorosilane (SiHCl 3, siH2Cl2, siCl 4), H2 and N2, and since chlorosilane is very easy to hydrolyze, the tail gas is usually washed by alkali liquor, such as dilute NaOH solution, lime milk and the like.
The tail gas washing wastewater is a main component of polysilicon production wastewater and changes along with the discharge of process waste gas and the concentration changes of chlorosilane and hydrogen chloride. And mixing the tail gas washing wastewater with other wastewater (pure water sewage, corrosion cleaning water, silicon core processing lubricating water, ground washing water, domestic sewage and the like) in the polysilicon industry plant area in a wastewater station regulating tank to form salt-containing wastewater.
The salt-containing wastewater mainly comprises high-sodium wastewater (main components of NaCl, na2SO4, a small amount of heavy metals, COD, nitrate radicals and the like) and high-calcium wastewater (main components of NaCl, caCl2 and BaCl 2), and in the related technology, when the salt-containing wastewater is treated, the salt-containing wastewater is directly mixed and then discharged to a sewage treatment center for treatment, SO that the burden of the sewage treatment center is increased, and meanwhile, the waste of the wastewater resources which should be utilized is caused, and the overall cost of wastewater treatment is high.
Disclosure of Invention
In order to solve the technical problems, the application provides a wastewater treatment process in the polysilicon industry.
The application provides a polycrystalline silicon trade effluent disposal system, adopts following technical scheme:
a polysilicon industry wastewater treatment process comprises the following steps: high-calcium wastewater is subjected to evaporation concentration and high-temperature crystallization in sequence to obtain high-calcium wastewater crystallization clear liquid and high-calcium wastewater crystallization magma, the high-calcium wastewater crystallization clear liquid is processed by a flaker to produce calcium chloride containing crystal water, the high-calcium wastewater crystallization magma is centrifuged and separated to obtain high-calcium wastewater centrifugal mother liquid and high-calcium wastewater centrifugal wet solid, the high-calcium wastewater centrifugal wet solid is dried to produce sodium chloride, and the high-calcium wastewater centrifugal mother liquid is recycled for high-temperature crystallization until the separation amount of the high-calcium wastewater centrifugal wet solid is close to zero; and (3) after the high-sodium wastewater sequentially undergoes the steps of salinity conversion, chemical adding and impurity removal and evaporative crystallization, finally producing sodium chloride.
By adopting the technical scheme, the high-calcium wastewater and the high-sodium wastewater are respectively treated, so that the burden of a sewage treatment center is reduced. The high-calcium wastewater finally produces sodium chloride and calcium chloride containing crystal water, the high-sodium wastewater finally produces sodium chloride, and the sodium chloride and the calcium chloride containing crystal water can be used as snow-melting agents, so that ion resources in the high-calcium wastewater and the high-sodium wastewater are effectively utilized, and the overall cost of wastewater treatment is reduced.
Optionally, in the step of salt conversion, the clear liquid of the high-calcium wastewater crystallization is added into the high-sodium wastewater, and the sulfate radicals in the high-sodium wastewater are removed by using calcium ions and barium ions in the clear liquid of the high-calcium wastewater crystallization.
By adopting the technical scheme, after the high-calcium wastewater crystallization clear solution is added into the high-sodium wastewater, calcium chloride and barium chloride can respectively and chemically react with sodium sulfate to generate calcium sulfate, sodium chloride, barium sulfate and sodium chloride, the calcium sulfate is slightly soluble in water, the barium sulfate is insoluble in water, and most of sulfate radicals in the high-sodium wastewater can be removed after the calcium sulfate and the barium chloride are filtered.
Optionally, in the step of adding drugs and removing impurities, adding sodium hydroxide to combine with a small amount of heavy metal ions in the high-sodium wastewater to generate a precipitate, adding sodium carbonate to remove impurities from calcium chloride and barium chloride in the crystallization clear solution of the high-calcium wastewater to generate calcium carbonate precipitate, barium carbonate precipitate and sodium chloride, adding a flocculating agent, performing flocculation and sedimentation, then filtering, and purifying sodium chloride in the filtered high-sodium wastewater.
By adopting the technical scheme, a small amount of heavy metal ions in the high-sodium wastewater are combined by adding sodium hydroxide to generate a precipitate, and the content of the heavy metal ions in the high-sodium wastewater can be reduced after filtering. And (3) adding sodium carbonate to remove impurities from calcium chloride and barium chloride in the added high-calcium wastewater crystallization clear liquid, and adding a flocculating agent to facilitate fine precipitate particles in the high-sodium wastewater to be condensed into large flocculent precipitates, so that the precipitation and sedimentation process is accelerated, and the filtering and separation of the precipitates in the high-sodium wastewater are facilitated.
Optionally, the high-sodium wastewater forms a high-sodium wastewater crystallization clear solution and a high-sodium wastewater crystallization magma after the step of evaporative crystallization, the high-sodium wastewater crystallization magma is centrifuged to obtain a high-sodium wastewater centrifugal mother solution and a high-sodium wastewater centrifugal wet solid material, the high-sodium wastewater centrifugal wet solid material is dried to produce sodium chloride, and the high-sodium wastewater centrifugal mother solution is recycled for evaporative crystallization until the separation amount of the high-sodium wastewater centrifugal wet solid material finally approaches zero.
By adopting the technical scheme, the centrifugal mother liquor of the high-sodium wastewater is repeatedly evaporated and crystallized, so that the yield of sodium chloride in the high-sodium wastewater can be improved, and the salt content in the high-sodium wastewater can be effectively reduced.
Optionally, before centrifuging the high-calcium wastewater crystal slurry, adding the high-sodium wastewater crystal clear liquid into the high-calcium wastewater crystal slurry, washing the high-calcium wastewater crystal slurry by using the high-sodium wastewater crystal clear liquid, and washing calcium ions and barium ions.
By adopting the technical scheme, because the high-sodium wastewater crystallization clear liquid is a relatively pure sodium chloride saturated solution, after the high-calcium wastewater crystallization crystal slurry is added, sodium chloride in the high-calcium wastewater crystallization crystal slurry cannot be dissolved in the high-sodium wastewater crystallization clear liquid, and barium chloride and calcium chloride in the high-calcium wastewater crystallization crystal slurry can be dissolved in the high-sodium wastewater crystallization clear liquid, so that the purity of the sodium chloride produced by the high-calcium wastewater can be improved.
Optionally, when the high-calcium wastewater crystal magma is washed, the high-calcium wastewater crystal magma is sent to a salt washer, and then the high-sodium wastewater crystal clear liquid is added into the salt washer.
By adopting the technical scheme, the salt washer provides a washing place for washing the high-calcium wastewater crystal magma, and the washing efficiency of the high-calcium wastewater crystal magma is improved.
Optionally, the salt scrubber includes the frame, be equipped with feeding storehouse and salt scrubber storehouse in the frame, the feeding storehouse is used for pouring into high-calcium waste water crystal magma, the lower extreme in feeding storehouse is equipped with the blowing pipe, be equipped with the baiting valve on the blowing pipe, the lower extreme intercommunication of blowing pipe has a plurality of pipe chute, the one end that the blowing pipe was kept away from to the pipe chute is the lowest of self and locates in the salt scrubber storehouse, one side bottom that the salt scrubber storehouse diapire was kept away from to the pipe chute is equipped with the elutriation opening, be equipped with a plurality of main high-pressure pipelines on the salt scrubber storehouse, it has high-sodium waste water crystal clear solution to let in the main high-pressure pipeline, the output of main high-pressure pipeline is equipped with main shower nozzle, main nozzle sets up towards the elutriation opening, the bottom in salt scrubber storehouse is equipped with the drain pipe, be equipped with the drain valve on the drain pipe, the drain pipe is close to the one end in salt scrubber storehouse and is equipped with the filter plate, be equipped with the secondary nozzle in the salt scrubber storehouse, the secondary nozzle sets up towards the filter plate, be equipped with the scraping wings in the salt scrubber storehouse, be equipped with the scraping wings, the ejector pad is connected with the salt scrubber storehouse, the discharge gate, the push away from one side of the discharge gate.
Through adopting above-mentioned technical scheme, pour into high-calcium waste water crystal magma into the feeding storehouse after, open the baiting valve, high-calcium waste water crystal magma receives self gravity to influence the downward flow, through the pipe chute flow to elutriating the opening, open main shower nozzle after, main shower nozzle blowout high-sodium waste water crystallization clear liquid washes the high-calcium waste water crystal magma of elutriating the opening part to wash calcium chloride and barium chloride in the high-calcium waste water crystal magma, realize the purification to the sodium chloride. After the washing is finished, the high-sodium wastewater crystallization clear liquid enters the discharge pipe through the filter plate, and after the liquid outlet valve is opened, the high-sodium wastewater crystallization clear liquid can be discharged out of the salt washing bin. After the high-calcium wastewater crystal magma is elutriated, the driving source is started to drive the pushing plate to move, the high-calcium wastewater crystal magma is pushed to the discharge port, and at the moment, the high-calcium wastewater crystal magma can be pushed out of the salt washing bin after the baffle is opened, so that the elutriation process is convenient and rapid.
Optionally, the top of scraping wings is equipped with the arc, the upper end of the arcwall face that the driving source one side was kept away from to the arc with wash the salt storehouse and be close to one side inner wall butt of driving source, the highest point of arc is less than the lowest of time shower nozzle.
Through adopting above-mentioned technical scheme, through the setting of arc, before beginning to elutriate high calcium waste water crystal mush, remove the arc to and wash the salt storehouse and be close to one side inner wall butt on the driving source, can reduce and elutriate the condition emergence that in-process high calcium waste water crystal mush is stained with and attaches to the scraping wings top to make things convenient for the clearance of scraping wings.
Optionally, one side bottom that the pipe chute is close to the bottom wall of salt washing storehouse is equipped with a plurality of and elutriates the sieve mesh, be equipped with the impeller on the pipe chute, the impeller rotates with the pipe chute to be connected, the top of elutriating the sieve mesh is located to the impeller.
Through adopting above-mentioned technical scheme, through the setting of elutriating the sieve mesh, can see through after the high sodium waste water crystallization clear liquid blowout and elutriate the sieve mesh and fall into the salt washing storehouse, reduce the sputtering volume of the high sodium waste water crystallization clear liquid of spun, the clearance of the salt washer of being convenient for.
Optionally, a return spring is arranged in the inclined tube, one end of the return spring is fixedly connected with the inner wall of the inclined tube, a dredging plate is arranged at the other end of the return spring, a dredging hole is formed in the dredging plate, the dredging plate is connected with the inner wall of the inclined tube in a sliding manner, a leading-out rod is arranged on the dredging plate, a cutting groove for the leading-out rod to penetrate out is formed in the inclined tube, a sliding ring is sleeved on the inclined tube, and the sliding ring is fixedly connected with the leading-out rod.
By adopting the technical scheme, when the sliding ring is pulled, on one hand, the sliding ring can scrape the high-calcium wastewater crystal slurry sputtered on the inclined tube down so as to facilitate the cleaning of the inclined tube; on the other hand, the sliding ring slides to drive the leading-out rod to move, the leading-out rod moves to drive the dredging plate to move, the dredging plate can dredge the inclined pipe, and the possibility of silting of the inclined pipe is reduced. When the sliding ring is loosened, the spring resets to drive the baffle and the sliding ring to move along the length direction of the inclined tube simultaneously, so that the cleaning efficiency of the inclined tube and the dredging efficiency of the inclined tube are improved.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the high-calcium wastewater and the high-sodium wastewater are respectively treated, so that the burden of a sewage treatment center is reduced. The high-calcium wastewater finally produces sodium chloride and calcium chloride containing crystal water, the high-sodium wastewater finally produces sodium chloride, and the sodium chloride and the calcium chloride containing crystal water can be used as snow-melting agents, so that ion resources in the high-calcium wastewater and the high-sodium wastewater are effectively utilized, and the overall cost of wastewater treatment is reduced;
2. after the high-calcium wastewater crystallization clear solution is added into the high-sodium wastewater, calcium chloride and barium chloride can respectively chemically react with sodium sulfate to generate calcium sulfate, sodium chloride, barium sulfate and sodium chloride, wherein the calcium sulfate is slightly soluble in water, the barium sulfate is insoluble in water, most sulfate radicals in the high-sodium wastewater can be removed after filtration, and the purity of the sodium chloride produced by the high-sodium wastewater is improved;
3. because the clear liquid of the high-sodium wastewater crystallization is a relatively pure saturated solution of sodium chloride, after the pure solution of sodium chloride is added into the high-calcium wastewater crystallization magma, the sodium chloride in the high-calcium wastewater crystallization magma cannot be dissolved in the clear liquid of the high-sodium wastewater crystallization, and the barium chloride and the calcium chloride in the high-calcium wastewater crystallization magma can be dissolved in the clear liquid of the high-sodium wastewater crystallization, so that the purity of the sodium chloride produced by the high-calcium wastewater can be improved.
Drawings
FIG. 1 is a flow chart showing a process for treating salt-containing wastewater in an embodiment of the present application.
Fig. 2 is a schematic diagram of the overall structure of a salt scrubber embodying the embodiments of the present application.
FIG. 3 is a schematic structural view showing the positional relationship between the elutriation openings and the main nozzles in the embodiment of the present application.
FIG. 4 is a cut-away view of the position relationship of the stripper plate and the arcuate plate embodying the embodiments of the subject application.
Fig. 5 is a partially enlarged schematic view at a in fig. 4.
FIG. 6 is a cutaway view of a clearance plate and runner connection embodying embodiments of the present application.
Description of reference numerals: 1. a frame; 2. a salt washing bin; 21. a connecting frame; 22. a main high pressure conduit; 221. a main spray head; 23. a liquid outlet pipe; 231. a liquid outlet valve; 232. filtering a plate; 24. a secondary high pressure pipeline; 241. a secondary nozzle; 25. a material pushing plate; 251. an arc-shaped plate; 26. a drive source; 27. a discharge port; 271. a baffle plate; 28. a driving cylinder; 3. a feeding bin; 31. discharging the material pipe; 311. a discharge valve; 32. an inclined pipe; 321. elutriating the opening; 322. elutriating the sieve pores; 323. a central shaft; 3231. an impeller; 324. a return spring; 325. dredging the plate; 3251. dredging a through hole; 3252. yan Weikuai; 3253. leading out a rod; 3254. grooving; 326. a dovetail groove; 327. a sliding ring.
Detailed Description
The present application is described in further detail below with reference to figures 1-6.
The embodiment of the application discloses a wastewater treatment process in the polysilicon industry. Referring to fig. 1, a polysilicon industry wastewater treatment process comprises the following steps: after the high-calcium wastewater (main components of sodium chloride, calcium chloride and barium chloride) is evaporated and concentrated by using an MVR or multi-effect concentration system, a two-effect FC evaporative crystallization system and a single-effect OSLO evaporative crystallization system are sequentially used for high-temperature crystallization to obtain high-calcium wastewater crystallization clear liquid and high-calcium wastewater crystallization crystal slurry, and the high-calcium wastewater crystallization clear liquid is processed by a flaker to produce calcium chloride containing crystal water.
Referring to fig. 1, the high calcium wastewater crystallization magma is separated by a centrifuge after centrifugation to obtain high calcium wastewater centrifugation mother liquor and high calcium wastewater centrifugation wet solid material, the high calcium wastewater centrifugation wet solid material is dried by a dryer to produce sodium chloride, and the high calcium wastewater centrifugation mother liquor is recycled for high temperature crystallization until the separation amount of the high calcium wastewater centrifugation wet solid material is close to zero. By repeatedly carrying out high-temperature crystallization on the high-calcium wastewater centrifugal mother liquor, the yield of sodium chloride in the high-calcium wastewater can be improved, and the salt content in the high-calcium wastewater can be effectively reduced.
Referring to fig. 1, the high-sodium wastewater (mainly comprising sodium chloride, sodium sulfate, and a small amount of heavy metals, COD, nitrate, etc.) is subjected to salt conversion, chemical dosing for impurity removal, and evaporative crystallization in sequence to finally produce sodium chloride. In the step of salt conversion, after the high-sodium wastewater is added into the regulating tank, the high-calcium wastewater crystallization clear liquid is added into the high-sodium wastewater, and the sulfate radicals in the high-sodium wastewater are removed by using calcium ions and barium ions in the high-calcium wastewater crystallization clear liquid. In the process, calcium chloride and barium chloride in the high-calcium wastewater crystallization clear solution can respectively and chemically react with sodium sulfate in the high-sodium wastewater to generate calcium sulfate, sodium chloride and barium sulfate and sodium chloride, the calcium sulfate is slightly soluble in water, the barium sulfate is insoluble in water, and most of sulfate radicals in the high-sodium wastewater can be removed after filtration.
Referring to fig. 1, in the step of adding chemicals and removing impurities, sodium hydroxide is added to combine a small amount of heavy metal ions in the high-sodium wastewater to generate a precipitate, and the content of the heavy metal ions in the high-sodium wastewater can be reduced after filtration. And adding sodium carbonate to remove impurities from calcium chloride and barium chloride in the high-calcium wastewater crystallization clear liquid to generate calcium carbonate precipitate, barium carbonate precipitate and sodium chloride. Adding a flocculating agent to facilitate fine precipitated particles in the high-sodium wastewater to be condensed into large flocculent precipitates, performing hard removal filtration by using a tubular microfiltration membrane after the flocculent precipitates, and purifying sodium chloride in the filtered high-sodium wastewater. In this example, the flocculants were PAC and PAM.
Referring to fig. 1, after the high-sodium wastewater subjected to hardness removal by the tubular microfiltration membrane is filtered by the MVR, the high-sodium wastewater is evaporated and concentrated by the MVR or the multi-effect concentration system, and then is evaporated and crystallized by the single-effect FC evaporative crystallization system and the double-effect OSLO evaporative crystallization system in sequence. The high-sodium wastewater is subjected to the step of evaporative crystallization to form a high-sodium wastewater crystallization clear solution and a high-sodium wastewater crystallization magma, the high-sodium wastewater crystallization magma is subjected to centrifugation to obtain a high-sodium wastewater centrifugal mother solution and a high-sodium wastewater centrifugal wet solid material, the high-sodium wastewater centrifugal wet solid material is subjected to drying treatment to produce sodium chloride, and the high-sodium wastewater centrifugal mother solution is recycled for evaporative crystallization until the separation amount of the high-sodium wastewater centrifugal wet solid material is finally almost zero. In this way, the centrifugal mother liquor of the high-sodium wastewater is repeatedly evaporated and crystallized, so that the yield of sodium chloride in the high-sodium wastewater can be improved, and the salt content in the high-sodium wastewater can be effectively reduced.
Referring to fig. 1, before centrifugation, the high-sodium wastewater crystallization clear liquid is added into the high-calcium wastewater crystallization crystal slurry, and the high-sodium wastewater crystallization clear liquid is used for washing the high-calcium wastewater crystallization crystal slurry, so as to wash calcium ions and barium ions. Because the clear liquid of the high-sodium wastewater crystallization is a relatively pure saturated solution of sodium chloride, after the pure solution of sodium chloride is added into the high-calcium wastewater crystallization magma, the sodium chloride in the high-calcium wastewater crystallization magma cannot be dissolved in the clear liquid of the high-sodium wastewater crystallization, and the barium chloride and the calcium chloride in the high-calcium wastewater crystallization magma can be dissolved in the clear liquid of the high-sodium wastewater crystallization, so that the purity of the sodium chloride produced by the high-calcium wastewater can be improved.
When the high-calcium wastewater crystallization crystal mush is washed, the high-calcium wastewater crystallization crystal mush is sent into a salt washer, and then the high-sodium wastewater crystallization clear liquid is added into the salt washer. Referring to fig. 2 and 3, the salt washer comprises a frame 1, a salt washing bin 2 is fixedly connected to the frame 1, the salt washing bin 2 is of a square uncovered bin body structure, a feeding bin 3 is fixedly mounted on the salt washing bin 2 through a connecting frame 21, and the feeding bin 3 is located in the center of the upper portion of the salt washing bin 2. The feeding bin 3 is used for injecting high-calcium wastewater crystal magma, the lower end of the feeding bin 3 is fixedly communicated with a discharging pipe 31, and the discharging pipe 31 is provided with a discharging valve 311. The fixed intercommunication of the lower extreme of blowing pipe 31 has a plurality of pipe chute 32, and the one end that pipe chute 32 kept away from blowing pipe 31 is the lowest of self and locates in the salt washing storehouse 2, and in this embodiment, pipe chute 32 is provided with four and four pipe chute 32 and evenly sets up along the circumference of blowing pipe 31. An elutriation opening 321 is formed in the bottom end of one side, away from the bottom wall of the salt washing bin 2, of the inclined tube 32, a main high-pressure pipeline 22 is fixedly arranged on the side wall of the salt washing bin 2 in a penetrating mode, high-sodium wastewater crystallization clear liquid is introduced into the main high-pressure pipeline 22, a main spray nozzle 221 is fixedly communicated with the output end of the main high-pressure pipeline 22, and the main spray nozzle 221 is arranged towards the elutriation opening 321.
After the high-calcium wastewater crystal magma is injected into the feeding bin 3, the discharge valve 311 is opened, the high-calcium wastewater crystal magma flows downwards under the influence of self gravity and flows to the elutriation opening 321 through the inclined pipe 32, after the main spray head 221 is opened, the main spray head 221 sprays high-sodium wastewater crystal clear liquid to wash the high-calcium wastewater crystal magma at the elutriation opening 321, so that calcium chloride and barium chloride in the high-calcium wastewater crystal magma are washed off, and the purification of sodium chloride is realized.
Referring to fig. 4, the bottom of the salt washing bin 2 is fixedly communicated with a liquid outlet pipe 23, a liquid outlet valve 231 is mounted on the liquid outlet pipe 23, and one end of the liquid outlet pipe 23 close to the salt washing bin 2 is fixedly connected with a filter plate 232. The side wall of the salt washing bin 2 is fixedly provided with a secondary high-pressure pipeline 24 in a penetrating mode, high-sodium wastewater crystallization clear liquid is introduced into the secondary high-pressure pipeline 24, the output end of the secondary high-pressure pipeline 24 is fixedly communicated with a secondary spray head 241, and the secondary spray head 241 faces the filter plate 232. So, high-calcium waste water crystallization magma is after the washing of main shower nozzle 221, in the washing through time shower nozzle 241, can be so that high-calcium waste water crystallization magma elutriation gets more thoroughly, further reduces the content of calcium chloride and barium chloride in the high-calcium waste water crystallization magma, washes the completion back, and high-sodium waste water crystallization clear liquid passes through filter plate 232 and gets into the discharging pipe, opens out behind liquid valve 231, can wash salt storehouse 2 with high-sodium waste water crystallization clear liquid discharge. In addition, the secondary nozzle 241 washes the filter plate 232, so that the possibility of blocking the filter plate 232 can be reduced, and the high-sodium wastewater crystallization clear liquid can be conveniently discharged.
Referring to fig. 3 and 4, a material pushing plate 25 is vertically installed in the salt washing bin 2, the material pushing plate 25 is connected with the salt washing bin 2 in a sliding manner, and the bottom end of the material pushing plate 25 is abutted to the bottom wall of the salt washing bin 2. The salt washing bin 2 is fixedly provided with a driving source 26, in this embodiment, the driving source 26 is an electric push rod. The output of driving source 26 penetrates into salt washing bin 2 and with scraping wings 25 fixed connection, and one side that salt washing bin 2 kept away from driving source 26 is equipped with discharge gate 27, and discharge gate 27 department installs baffle 271, and fixed mounting has on the lateral wall of salt washing bin 2 to drive actuating cylinder 28, drives actuating cylinder 28 and sets up along vertical direction, drives actuating cylinder 28's output and baffle 271's top fixed connection.
Accomplish at high calcium waste water crystallization magma and wash and discharge high sodium waste water crystallization clear liquid and wash salt storehouse 2 back, driving source 26 starts, drive scraping wings 25 removes, push high calcium waste water crystallization magma to discharge gate 27, meanwhile, it drives actuating cylinder 28 and drives baffle 271 rebound to drive, make discharge gate 27 open, scraping wings 25 can release high calcium waste water crystallization magma from discharge gate 27 and wash salt storehouse 2, can collect high calcium waste water crystallization magma in discharge gate 27 department, and is convenient and fast.
Referring to fig. 4, an arc plate 251 is fixedly connected to the top end of the material pushing plate 25, the upper end of the arc surface of the arc plate 251 on the side far away from the driving source 26 abuts against the inner wall of the salt washing bin 2 on the side close to the driving source 26, and the highest position of the arc plate 251 is lower than the lowest position of the spray head. So, before beginning to elutriate high calcium waste water crystal magma, move arc 251 to with the salt washing storehouse 2 be close to one side inner wall butt of driving source 26, can reduce the condition emergence that high calcium waste water crystal magma was stained with and attaches to the scraping wings 25 top in the elutriation process to make things convenient for the clearance of scraping wings 25.
Referring to fig. 4 and 5, a plurality of elutriation sieve holes 322 are formed in the bottom end of one side of the inclined tube 32 close to the bottom wall of the salt washing bin 2, a central shaft 323 is fixed on the inclined tube 32, the central shaft 323 is arranged along the radial direction of the inclined tube 32, an impeller 3231 is sleeved on the central shaft 323, and the impeller 3231 is located above the elutriation sieve holes 322 and is rotatably connected with the central shaft 323. So, through the setting of elutriating sieve mesh 322, can see through to elutriate the sieve mesh 322 and fall into salt washing storehouse 2 after the high sodium waste water crystallization clear liquid blowout, reduce the sputtering volume of the high sodium waste water crystallization clear liquid of spun, the clearance of the salt washer of being convenient for. Through the arrangement of the impeller 3231, when the high-calcium wastewater crystal magma flows down from the inclined pipe 32, the high-calcium wastewater crystal magma drives the impeller 3231 to rotate, and the impeller 3231 rotates to stir the high-calcium wastewater crystal magma, so that the high-calcium wastewater crystal magma is washed more thoroughly by the high-sodium wastewater crystal clear liquid; on the other hand, the high sodium wastewater crystallized clear liquid sprayed from the main nozzle 221 impacts the blades of the impeller 3231, so that the impeller 3231 is driven to rotate, and the high sodium wastewater crystallized clear liquid is further enabled to wash the high calcium wastewater crystallized crystal slurry more thoroughly.
Referring to fig. 6, a return spring 324 is installed in the inclined tube 32, one end of the return spring 324 is fixedly connected with the inner wall of the inclined tube 32, the other end of the return spring is fixedly connected with a dredging plate 325, a plurality of dredging holes 3251 are formed in the dredging plate 325, a dovetail block 3252 is fixedly connected to the peripheral side wall of the dredging plate 325, a dovetail groove 326 matched with the dovetail block 3252 is formed in the inner wall of the inclined tube 32, and the dovetail block 3252 is connected with the inner wall of the dovetail groove 326 in a sliding mode. An extraction rod 3253 is fixedly connected to the peripheral side wall of the dredging plate 325, a cutting groove 3254 through which the extraction rod 3253 penetrates is formed in the inclined tube 32, the cutting groove 3254 is arranged along the length direction of the inclined tube 32, a sliding ring 327 is sleeved on the inclined tube 32, and the sliding ring 327 is fixedly connected with the extraction rod 3253. When the sliding ring 327 is pulled, on one hand, the sliding ring 327 can scrape off the crystal slurry of the high-calcium wastewater crystal sputtered on the inclined tube 32 so as to facilitate the cleaning of the inclined tube 32; on the other hand, the sliding ring 327 slides to drive the leading-out rod 3253 to move, the leading-out rod 3253 moves to drive the dredging plate 325 to move, and the dredging plate 325 can dredge the inclined tube 32, so that the possibility of silting of the inclined tube 32 is reduced. When the sliding ring 327 is loosened, the spring is reset, the baffle 271 and the sliding ring 327 are driven to move along the length direction of the inclined tube 32, and the cleaning efficiency of the inclined tube 32 and the dredging efficiency of the inclined tube 32 are improved.
The implementation principle of the wastewater treatment process in the polysilicon industry in the embodiment of the application is as follows: the high-calcium wastewater and the high-sodium wastewater are respectively treated, so that the burden of a sewage treatment center is reduced. The high-calcium wastewater finally produces sodium chloride and calcium chloride containing crystal water, the high-sodium wastewater finally produces sodium chloride, and the sodium chloride and the calcium chloride containing crystal water can be used as snow-melting agents, so that ion resources in the high-calcium wastewater and the high-sodium wastewater are effectively utilized, and the overall cost of wastewater treatment is reduced.
After the high-calcium wastewater crystallization clear solution is added into the high-sodium wastewater, calcium chloride and barium chloride can respectively chemically react with sodium sulfate to generate calcium sulfate, sodium chloride and barium sulfate and sodium chloride, wherein the calcium sulfate is slightly soluble in water, the barium sulfate is insoluble in water, and most sulfate radicals in the high-sodium wastewater can be removed after filtration.
After the high-sodium wastewater crystallization clear liquid is added into the high-calcium wastewater crystallization crystal mush, because the high-sodium wastewater crystallization clear liquid is a relatively pure sodium chloride saturated solution, sodium chloride in the high-calcium wastewater crystallization crystal mush cannot be dissolved in the high-sodium wastewater crystallization clear liquid, and barium chloride and calcium chloride in the high-calcium wastewater crystallization crystal mush can be dissolved in the high-sodium wastewater crystallization clear liquid, so that the purity of sodium chloride produced by high-calcium wastewater can be improved.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The polysilicon industry wastewater treatment process is characterized by comprising the following steps: high-calcium wastewater is subjected to evaporation concentration and high-temperature crystallization in sequence to obtain high-calcium wastewater crystallization clear liquid and high-calcium wastewater crystallization magma, the high-calcium wastewater crystallization clear liquid is processed by a flaker to produce calcium chloride containing crystal water, the high-calcium wastewater crystallization magma is centrifuged and separated to obtain high-calcium wastewater centrifugal mother liquid and high-calcium wastewater centrifugal wet solid, the high-calcium wastewater centrifugal wet solid is dried to produce sodium chloride, and the high-calcium wastewater centrifugal mother liquid is recycled for high-temperature crystallization until the separation amount of the high-calcium wastewater centrifugal wet solid is close to zero; and (3) sequentially carrying out the steps of salt conversion, chemical adding and impurity removal, and evaporative crystallization on the high-sodium wastewater to finally produce sodium chloride.
2. The polysilicon industry wastewater treatment process according to claim 1, wherein the polysilicon industry wastewater treatment process comprises the following steps: and in the step of salt conversion, adding the clear crystallization liquid of the high-calcium wastewater into the high-sodium wastewater, and removing sulfate radicals in the high-sodium wastewater by using calcium ions and barium ions in the clear crystallization liquid of the high-calcium wastewater.
3. The polysilicon industry wastewater treatment process as set forth in claim 2, wherein: in the step of adding the medicine and removing the impurities, adding sodium hydroxide to combine a small amount of heavy metal ions in the high-sodium wastewater to generate a precipitate, adding sodium carbonate to remove impurities from calcium chloride and barium chloride in the crystallization clear liquid of the high-calcium wastewater to generate calcium carbonate precipitate, barium carbonate precipitate and sodium chloride, adding a flocculating agent, filtering after flocculation and sedimentation, and purifying the sodium chloride in the filtered high-sodium wastewater.
4. The polysilicon industry wastewater treatment process as set forth in claim 2, wherein: and (3) forming a high-sodium wastewater crystallization clear solution and a high-sodium wastewater crystallization magma after the high-sodium wastewater is subjected to the step of evaporative crystallization, centrifuging the high-sodium wastewater crystallization magma to obtain a high-sodium wastewater centrifugal mother solution and a high-sodium wastewater centrifugal wet solid material, drying the high-sodium wastewater centrifugal wet solid material to produce sodium chloride, and recycling the high-sodium wastewater centrifugal mother solution for evaporative crystallization until the separation amount of the high-sodium wastewater centrifugal wet solid material is close to zero.
5. The polysilicon industry wastewater treatment process according to claim 4, wherein the polysilicon industry wastewater treatment process comprises the following steps: adding the high-sodium wastewater crystallization clear liquid into the high-calcium wastewater crystallization crystal slurry before centrifuging, washing the high-calcium wastewater crystallization crystal slurry by using the high-sodium wastewater crystallization clear liquid, and washing calcium ions and barium ions.
6. The polysilicon industry wastewater treatment process according to claim 5, wherein the polysilicon industry wastewater treatment process comprises the following steps: when the high-calcium wastewater crystal magma is washed, the high-calcium wastewater crystal magma is sent into a salt washer, and then the high-sodium wastewater crystal clear liquid is added into the salt washer.
7. The polysilicon industry wastewater treatment process according to claim 6, wherein the wastewater treatment process comprises the following steps: the salt washer comprises a frame (1), a feeding bin (3) and a salt washing bin (2) are arranged on the frame (1), the feeding bin (3) is used for injecting high-calcium wastewater crystal slurry, a discharging pipe (31) is arranged at the lower end of the feeding bin (3), a discharging valve (311) is arranged on the discharging pipe (31), the lower end of the discharging pipe (31) is communicated with a plurality of inclined pipes (32), one end, far away from the discharging pipe (31), of each inclined pipe (32) is the lowest part of the inclined pipe (32) and is arranged in the salt washing bin (2), one side bottom end, far away from the bottom wall of the salt washing bin (2), of each inclined pipe (32) is provided with an elutriation opening (321), a plurality of main high-pressure pipelines (22) are arranged on the frame (1), high-sodium wastewater crystal clear liquid is introduced into the main high-pressure pipelines (22), the output ends of the main high-pressure pipelines (22) are provided with main spray heads (221), the main spray heads (221) are arranged towards the elutriation openings (321), a drain pipe (23) is arranged at the bottom of the salt washing bin (2), one end of the salt washing bin (232) is provided with a drain pipe (232), one end of the secondary filter plate (241) is arranged in the salt washing bin (232, one end of the drain pipe (232 is arranged in the drain pipe (232), wash and be equipped with scraping wings (25) in salt storehouse (2), scraping wings (25) slide with salt washing storehouse (2) and be connected, be equipped with driving source (26) on salt washing storehouse (2), the output of driving source (26) penetrates and washes salt storehouse (2) and with scraping wings (25) fixed connection, it is equipped with discharge gate (27) to wash one side that salt storehouse (2) kept away from driving source (26), discharge gate (27) department is equipped with baffle (271).
8. The polysilicon industry wastewater treatment process according to claim 7, wherein the polysilicon industry wastewater treatment process comprises the following steps: the top end of the material pushing plate (25) is provided with an arc-shaped plate (251), the upper end of an arc-shaped surface of one side, far away from the driving source (26), of the arc-shaped plate (251) is abutted to the inner wall of one side, close to the driving source (26), of the salt washing bin (2), and the highest position of the arc-shaped plate (251) is lower than the lowest position of the secondary spray head (241).
9. The polysilicon industry wastewater treatment process according to claim 7, wherein the process comprises the following steps: one side bottom that pipe chute (32) are close to salt washing storehouse (2) diapire is equipped with a plurality of and elutriates sieve mesh (322), be equipped with impeller (3231) on pipe chute (32), impeller (3231) rotates with pipe chute (32) and is connected, the top of elutriating sieve mesh (322) is located in impeller (3231).
10. The polysilicon industry wastewater treatment process according to claim 7, wherein the polysilicon industry wastewater treatment process comprises the following steps: be equipped with reset spring (324) in pipe chute (32), the inner wall fixed connection of the one end of reset spring (324) and pipe chute (32), the other end is equipped with dredge board (325), be equipped with on dredge board (325) and dredge hole (3251), dredge board (325) slides with the inner wall of pipe chute (32) and is connected, it draws pole (3253) to be equipped with on dredge board (325), be equipped with on pipe chute (32) and supply to draw grooving (3254) that pole (3253) worn out, the cover is equipped with runner (327) on pipe chute (32), runner (327) and draw pole (3253) fixed connection.
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